CHANGES.md

Change history for MATPOWER

MATPOWER release notes, found in docs/relnotes, contain summaries of the primary changes in each versioned release.

For change history for MP-Test, see mptest/CHANGES.md.
For change history for MIPS, see mips/CHANGES.md.
For change history for MOST, see most/CHANGES.md.

Changes since 7.0

10/15/19

• Move original implementation of Newton power flow for cartesian voltage representations to newtonpf_S_hybrid() and newtonpf_I_hybrid(), accessible by setting the pf.v_cartesian option to 2. The pf.alg option can also be set to 'NR-SH' or 'NR-IH', respectively, as shortcuts to select these formulations.
• Improve robustness of these hybrid Newton power flow formulations to avoid ill-conditioning when the real part of the voltage approaches zero.
• The pf.alg option now accepts 'NR-SP' as a shortcut for Newton's method with with the default power/polar formulation.
• Redesign implementation of Newton power flow for cartesian voltage representations to use standard Newton method with explicit voltage magnitude constraints at PV buses. This method is slower (larger number of equations and unknowns) but appears to be more reliable in some cases than the original implementation, which was a hybrid approach by Sereeter that used a modified Newton method to compute polar voltage updates using a modified cartesian Jacobian.

10/11/19

• Modify voltage limit constraints for cartesian AC OPF formulation to use voltage squared, resulting in simpler derivatives.

8/21/19

• Fix OPF issue #71 for IPOPT and Knitro where structure of Jacobian and/or Hessian could change from the structure provided (i.e. elements with value of zero were being eliminated from the sparsity structure). Thanks to Drosos Kourounis.

8/16/19

• Fix issue #77 where incorrect indexing could cause fatal error in OPF with additional nonlinear constraints. Thanks to Sergio Garcia.

8/15/19

• Improve performance of @opt_model/add_named_set(). (See issue #79.) Thanks to Baraa Mohandes.
• Refactor code in @opt_model/params_lin_constraint() and @opt_model/params_quad_cost() to speed up sparse matrix construction when there are lots of constraint or cost sets. Results in significant speedups for some problems during problem setup in MOST. (See pull request #70.) Thanks to Daniel Muldrew.
• Remove active-set algorithm in t_opf_dc_ot for certain versions of MATLAB (e.g. R2013b on Mac) to avoid triggering fatal MATLAB bug.

Version 7.0 - Jun 20, 2019

6/20/19

• Release 7.0.
• Add CITATION file.
• Other miscellaneous documentation updates, e.g. MATPOWER website links updated to https://matpower.org, separate references for MATPOWER software and User's Manual, with DOIs.

6/5/19

• INCOMPATIBLE CHANGE: Fix issue #60 by adding missing generator at slack bus in RTE cases. Affects the following cases:
  • case1888rte
  • case1951rte
  • case2848rte
  • case2868rte
  • case6468rte
  • case6470rte
  • case6495rte
  • case6515rte Thanks to Jean Maeght.

5/30/19

• Add 'clear_cache' options to have_fcn() to facilitate re-checking for optional functionality after changes to the MATLAB/Octave path. See issue #65.
• Add tests for have_fcn().

5/29/19

• Fix errors caused by running test_matpower with YALMIP present but not MOSEK, SeDuMi or SDPT3.

5/23/19

• Treat MOSEK 'OPTIMAL' solution as successful even if return code is MSK_RES_TRM_STALL in qps_mosek() and miqps_mosek().

5/22/19

• Fix bug in have_fcn() where it would incorrectly mark Gurobi as available even if it had an expired license or failed for some other reason.

2/26/19

• INCOMPATIBLE CHANGE: Eliminate unnecessary reordering of on-line generators (sorted by increasing bus index) from ext2int. The order is now left unmodified by ext2int. This change should only affect user code that explicitly depends on the order of generators with internal numbering (hopefully quite rare).

2/22/19

• Clarify in manual and printpf output that units on branch current limits and outputs (i.e. when opf.flow_lim is 'I') are kA * basekV. Thanks to Maurice.

2/21/19

• Add three new variants of the standard Newton AC power flow, for a total of four, including both nodal power and current balance equations and both polar and cartesian representations of voltage. See the new pf.current_balance and pf.v_cartesian options. Thanks to Baljinnyam Sereeter.

2/15/19

• Branches 86--87, 68--116 in case118 changed from transmission lines (tap ratio = 0) to transformers (tap ratio = 1) for consistency with bus base voltages. Thanks to Drosos Kourounis.

2/11/19

• Clean up and reorganize power flow tests in t_pf.

2/1/19

• Add a Dockerfile used to auto-build the Docker image tagged matpower/matpower-desktop on Docker Hub. This image provides a pre-packaged Ubuntu desktop environment with Octave, MATPOWER and the MATPOWER Extras all pre-installed. See the docker/MATPOWER-Docker.md page for more details. Thanks to Richard Lincoln.

1/17/19

• Fix bug #57 where save2psse() always used 1 for the CKT number, even for parallel branches or transformers. Thanks to Amin Gholami.

1/17/19

• Fix bug #56 where save2psse() was missing entries for two transformer columns (VMA1 and VMI1). Thanks to Amin Gholami.

1/16/19

• Add option for install_matpower() to (non-interactively) uninstall MATPOWER, i.e. remove MATPOWER directories from MATLAB/Octave path.

1/14/19

• Enable YALMIP, SeDuMi and SDPT3 to be properly recognized under Octave. Thanks to Richard Lincoln.

11/29/18

• Improve performance of makeYbus() based on issue #52. Thanks to Binbin Chen.

11/26/18

• Fix bug #53 where certain OPF cases (e.g. case33bw) resulted in a fatal error under versions of MATLAB prior to R2016b (v9.1). Thanks to Jane Cheung.

11/9/18

• Add support for IPOPT solver under Octave, including in the Travis-CI testing. Thanks to Richard Lincoln.

Version 7.0b1 - Oct 31, 2018

10/31/18

• Released 7.0b1.
• Update versions of included packages
  • MIPS 1.3
  • MOST 1.0.1
  • MP-Test 7.0b1

10/25/18

• Add another purely synthetic case from the ACTIVSg team (ASU, Cornell, Texas A&M, U of IL, and VCU - Synthetic grids), resulting from work supported by the ARPA-E GRID DATA program. Thanks to Adam Birchfield and the ACTIVSg team.
  • case_SyntheticUSA (82,000-bus continental USA synthetic model, aggregation of case_ACTIVSg2000, case_ACTIVSg10k, case_ACTIVSg70k, connected by 9 DC lines)

10/16/18

• INCOMPATIBLE CHANGE: Correct signs of phase shifter angles in Polish system cases, since they were based on the old sign convention used by MATPOWER prior to v3.2 (see change on 6/21/07). Affects the following cases:
  • case2383wp
  • case2736sp
  • case2737sop
  • case2746wop
  • case2746wp
  • case3375wp Thanks to Mikhail Khokhlov and Dr. Artjoms Obusevs for reporting.
• Fix runpf() handling of case where individual power flow fails during Q limit enforcement.

10/9/18

• Add option opf.softlims.default for use with enhanced toggle_softlims() to determine whether or not to include soft limits on constraints whose parameters are not specified explicitly in the mpc.softlims struct.
• Update toggle_softlims() to implement soft limits for all OPF inequality constraints, i.e. bus voltage bounds, generator active & reactive bounds, branch flow and branch angle difference limits. Thanks to Eran Schweitzer.
• Add optional mpopt argument to calls to ext2int() and int2ext().
• INCOMPATIBLE CHANGE: Add mpopt to input args for OPF ext2int and int2ext callbacks.
• INCOMPATIBLE CHANGE: Turning soft limits on without specifying any parameters explicitly in mpc.softlims now implements soft limits for all constraints, by default, not just branch flow limits. And the format of the input parameters in mpc.softlims has changed. See help toggle_softlims for the details.

9/10/18

• Add support for PARDISO v6.x.

8/30/18

• Update to Aug 9, 2018 version of case_ACTIVSg2000.

6/19/18

• Correct (swap) names of fields e2i and i2e used internally (in mpc.order.gen) to map between external and internal indexing of generators.
• Improve error messages and documentation related to specifying dispatchable loads and their power factor constraints.

5/31/18

• Add another purely synthetic case from the ACTIVSg team (ASU, Cornell, Texas A&M, U of IL, and VCU - Synthetic grids), resulting from work supported by the ARPA-E GRID DATA program. Thanks to Adam Birchfield and the ACTIVSg team.
  • case_ACTIVSg70k (70,000-bus Eastern US synthetic model)

5/19/18

• Add loadshed() function to compute MW curtailments of dispatchable loads.

5/18/18

• Add lng for "Liquefied Natural Gas" to genfuels().
• Under Octave, disable the use of explicit LU decomposition with AMD reordering and the 3 output argument form of LU for Newton power flow on larger systems. In Octave 4.4 it generates warnings about potential LU failures and slows it down.

5/10/18

• Fix bug in order of lambdas used in opf_branch_ang_hess() and opf_vlim_hess() that resulted in wrong sign in Hessian terms.
• Fix bug #36 where Hessian structure for Ipopt and Knitro were incorrect. Re-enabled skipped tests that were previously failing.

4/19/18

• Add AC OPF tests for cases with ref bus ~= 1 and ref angle ~= 0.
• Fix fatal error in opf_vref_hess() for cases where ref bus ~= 1.

4/12/18

• Add to nested_struct_copy() ability to copy fields that are struct arrays.

4/5/18

• INCOMPATIBLE CHANGE: Swap the order of the output arguments of dSbus_dV() for polar coordinate voltages (angle before magnitude) for consistency.

4/3/18

• Add three new variants of the standard AC OPF formulation, for a total of four, including both nodal power and current balance constraints and both polar and cartesian representations of voltage. See the new opf.current_balance and opf.v_cartesian options. Thanks to Baljinnyam Sereeter.
• Update existing functions that compute derivatives with respect to voltage to handle cartesian coordinate voltages in addition to polar. Thanks to Baljinnyam Sereeter.
• Update existing functions that compute derivatives with respect to voltage to handle cartesian coordinate voltages in addition to polar. Thanks to Baljinnyam Sereeter.
• Add functions to compute derivatives of current balance constraint: Thanks to Baljinnyam Sereeter.
  • dImis_dV
  • d2Imis_dV2
  • d2Imis_dVdSg
• Add functions to implement constraints for new AC OPF variants. Thanks to Baljinnyam Sereeter.
  • opf_branch_ang_fcn, opf_branch_ang_hess
  • opf_current_balance_fcn, opf_current_balance_hess
  • opf_veq_fcn, opf_veq_hess
  • opf_vlim_fcn, opf_vlim_hess
  • opf_vref_fcn, opf_vref_hess
• Add two new Technical Notes (TN3, TN4) and updated revision of TN2. Thanks to Baljinnyam Sereeter.
  • MATPOWER Technical Note 3
  • MATPOWER Technical Note 4
• Add d2Abr_dV2() to replace the (now deprecated) separate functions d2AIbr_dV2() and d2ASbr_dV2().

3/7/18

• Replace clock()/etime() with tic()/toc() for timing.

12/22/17

• Add another purely synthetic case from the ACTIVSg team (ASU, Cornell, Texas A&M, U of IL, and VCU - Synthetic grids), resulting from work supported by the ARPA-E GRID DATA program. Thanks to Adam Birchfield and the ACTIVSg team.
  • case_ACTIVSg25k (25,000-bus US Northeast/Mid-Atlantic synthetic model)

12/6/17

• Fix bug #21 where a continuation power flow that failed the first corrector step would produce a fatal error. Thanks to Elis Nycander.
• Fix bug #23 where the continuation power flow could switch directions unexpectedly when the operating point switched from stable to unstable manifold or vice-versa after hitting a limit. Thanks to Elis Nycander and Shrirang Abhyankar.
• Fix bug #26 where, in a continuation power flow, a reactive limit at a bus could be detected in error if multiple generators at the bus had reactive ranges of very different sizes. Thanks to Elis Nycander and Shrirang Abhyankar.
• Remove numerical proxies for Inf from case files. Some cases used 9999 and/or 99999 as numerical proxies to indicate the absence of limits on generator QMIN, QMAX (replaced with -Inf, Inf) or branch RATE_A, RATE_B, RATE_C (replaced with 0).

11/29/17

• Add new option knitro.maxit to set maximum number of iterations for AC OPF solver using Knitro.

11/22/17

• Add new option opf.start to replace deprecated opf.init_from_mpc and add a new possibility to automatically run a power flow to initialize the starting state for the OPF.

11/17/17

• Improve handling of allocation of reactive power among multiple generators at a bus in power flow solution. Use equal violation at buses where total Qmin == total Qmax. Eliminate NaNs in case of infinite Q ranges.

11/14/17

• Add MATPOWER logo to User's Manual.

11/7/17

• Remove deprecated non-fatal error mechanism in loadcase().
• Update feval_w_path() to allow empty string for path, equivalent to calling feval() directly.
• Modify loadcase() to use feval_w_path().
• Make install_matpower() check for minimum required MATLAB/Octave version.
• IMPORTANT NOTE: For MATLAB users, the minimum requirement for MATPOWER is now MATLAB 7.3.0 (R2006b). (No access to older versions for testing).

11/3/17

• Add case_RTS_GMLC from here.

10/31/17

• Update case9 with complete reference to source data and updated generator voltages, initial reactive injections and slack active injection to more closely match original source.
• Make AC OPF solver always default to MIPS, even if TSPOPF is installed. i.e. opf.ac.solver = 'DEFAULT' is now identical to opf.ac.solver = 'MIPS'.
• Add E4ST to have_fcn() and mpver output.

10/27/17

• Add contingencies and scenarios for ACTIVSg cases, contingencies for all four, and one year of hourly zonal or area load scenarios for 200 and 2000 bus cases.

10/11/17

• Add t_opf_default() to test AC OPF with opf.ac.solver set to DEFAULT.
• Fix bug in setup of OPF (introduced since v6.0), triggered by running an AC OPF with opf.ac.solver set to DEFAULT with TSPOPF installed. Thanks to Carlos Murillo-Sanchez.
• Fix bug in setup of OPF (introduced since v6.0), triggered by running a DC OPF with opf.ac.solver set one of the legacy MEX-based solvers such as PDIPM. Set opf.ac.solver to PDIPM for some of the DC OPF tests.

10/10/17

• Add savechgtab() function to save change tables, such as those used by apply_changes(), to a file.
• Fix issues with PSS/E import on newer Octave versions (e.g. 4.3). Fixes to MATLAB incompatibilities in regexp behavior eliminated the need for Octave-specific workarounds.

9/26/17

• Minor updates to support the latest versions of MATLAB, MOSEK and YALMIP.

9/15/17

• Add another purely synthetic case from the ACTIVSg team (ASU, Cornell, Texas A&M, U of IL, and VCU - Synthetic grids), resulting from work supported by the ARPA-E GRID DATA program. Thanks to Adam Birchfield and the ACTIVSg team.
  • case_ACTIVSg10k (10,000-bus US WECC synthetic model)

9/12/17

• Update @opt_model API for method naming consistency. Summary of deprecated method names, with new alternatives in parenthesis:
  • add_vars (add_var)
  • add_costs (add_legacy_cost, add_quad_cost or add_nln_cost)
  • add_constraints (add_lin_constraint or add_nln_constraint)
  • build_cost_params (no longer needed)
  • compute_cost (eval_legacy_cost)
  • get_cost_params (params_legacy_cost)
  • getv (params_var)
  • linear_constraints (params_lin_constraint)

9/8/17

• Add general nonlinear cost values to OPF results in results.nlc.

9/6/17

• Refactor AC and DC OPF code to use the new quadratic and general nonlinear cost handling of opt_model to build and evaluate generator and user-defined costs and their derivatives.

9/5/17

• Add tests for OPF with high-degree polynomial (greater than quadratic) generator cost functions.
• Add tests for OPF with legacy user-defined cost functions that include "dead zone" with quadratic "penalty".
• Lay ground work for user-defined nonlinear OPF costs by adding support to opt_model for handling nonlinear costs with function handles for evaluating the cost function, gradients and Hessian.
• Add support to opt_model for handling quadratic costs.
• Deprecate the legacy generalized cost mechanism in opt_model based on add_costs() in favor the quadratic and general nonlinear mechanisms, add_quad_cost() and add_nln_cost().

8/22/17

• Add options 'cpf.enforce_v_lims' and 'cpf.enforce_flow_lims' to enforce bus voltage magnitude and branch flow limits in the continuation power flow, and 'cpf.v_lims_tol' and 'cpf.flow_lims_tol' to control the respective detection tolerances. Thanks to Ahmad Sadiq Abubakar and Shrirang Abhyankar.

8/18/17

• Expand support for soft branch flow limits in toggle_softlims to include AC OPF problems as well as DC OPF.
• Add support for direct specification of user-defined nonlinear constraints for AC OPF, in mpc.user_constraints.nle and mpc.user_constraints.nli, for equality and inequality constraints, respectively.

8/14/17

• Remove nln (nonlinear constraints) field from opt_model object, in favor of nle (nonlinear equalities) and nli (nonlinear inequalities).
• Add nle.lambda.<name> and nli.mu.<name> to OPF results struct.
• Add nle and nli fields to results.mu returned by *opf_solver functions.
• INCOMPATIBLE CHANGE: Remove nln.mu.l.<name> and nln.mu.u.<name> fields from OPF results struct. Use nle.lambda.<name> and nli.mu.<name> fields instead for nonlinear constraint multipliers.
• INCOMPATIBLE CHANGE: Modify order of default output arguments of opt_model/get_idx().
• INCOMPATIBLE CHANGE: Add mpopt to OPF formulation callback input args.

8/4/17

• Refactor AC OPF code to use the new nonlinear constraint handling of opt_model to build and evaluate power balance and branch flow constraints and their derivatives, and index shadow prices.
• Add option for opt_model/get_idx() to return arbitrarily selected index types.

7/10/17

• Lay ground work for user-defined nonlinear OPF constraints by adding support to opt_model for handling nonlinear constraints with function handles for evaluating the constraint function, gradients and Hessian.
• Deprecate the add_constraints() method of opt_model. Use the corresponding one of the following methods instead: add_lin_constraint(), add_nln_constraint() or init_indexed_name().

6/8/17

• Move @opt_model, @opf_model to use classdef. Modify code to use OOP notation everywhere for @opt_model/@opf_model objects, e.g. om.property, om.method(). IMPORTANT NOTE: For Octave users, the minimum requirement for MATPOWER is now Octave 4 or later.

5/25/17

• Add option to call @opt_model/compute_cost without idx argument and have it total over all indices for a given name.

5/24/17

• Remove OPF result columns from gen matrix returned by psse2mpc.
• Limit length of name of star-buses added by psse2mpc to 12 chars.
• Add save2psse with support for exporting MATPOWER case data to PSS/E RAW format.

5/23/17

• Add support for gentype and genfuel fields of MATPOWER case struct in extract_islands, ext2int, int2ext, load2disp and savecase.
• Add support for bus_name field of MATPOWER case struct to extract_islands, ext2int and int2ext.
• Add gentype and genfuel fields to three ACTIVSg cases.

5/22/17

• Add genfuels and gentypes to establish standard set of values for optional mpc.genfuel and mpc.gentype fields for generator fuel type and generator unit type, respectively.
• Fix bug #13 where setting all buses to type NONE (isolated) resulted in a fatal error for ext2int, runpf, runcpf and runopf. Thanks to SNPerkin.

5/19/17

• Add three new purely synthetic cases from the ACTIVSg team (ASU, Cornell, Texas A&M, U of IL, and VCU - Synthetic grids), resulting from work supported by the ARPA-E GRID DATA program. Thanks to Adam Birchfield and the ACTIVSg team.
  • case_ACTIVSg200 (200-bus Illinios synthetic model)
  • case_ACTIVSg500 (500-bus South Carolina synthetic model)
  • case_ACTIVSg2000 (2000-bus Texas synthetic model)

5/11/17

• Fix bug #12 where the CPF could terminate early when requesting trace of the full curve with P or Q limits enforced, if a limit becomes binding at the base case. Thanks to Felix.

5/3/17

• Fix #11 fatal error encountered when running test_matpower with SDP_PF and YALMIP installed, but no SDP solver. Now checks for availability of SeDuMi, SDP3 or MOSEK before attempting to run SDP_PF tests that require solving an SDP.

4/7/17

• Fix fatal bug in get_losses when computing derivatives of reactive branch injections and fix some related tests.
• Fix bug in makeJac in which voltage was set by generator voltage setpoint even for PQ buses.

4/7/17

• Fix fatal bug #8 when calling runcpf with base and target cases with identical load and generation. Thanks to Felix.

3/17/17

• In the Newton power flow, for larger systems use explicit LU decomposition with AMD reordering and the 3 output argument form of LU (to select the Gilbert-Peierls algorithm), resulting in up to a 2x speedup in MATLAB, 1.1x in Octave. Thanks to Jose Luis Marin.
• Add new pf.nr.lin_solver option to control the linear solver used to compute the Newton update step in the Newton-Raphson power flow.

2/9/17

• Add three new power flow algorithms for radial distribution systems selected via the three new options for pf.alg, namely 'PQSUM', 'ISUM', 'YSUM'. Also includes new MATPOWER options pf.radial.max_it and pf.radial.vcorr. See Section 4.3 on "Distribution Power Flow" in the manual for details. Thanks to Mirko Todorovski.
• Add 6 new radial distribution system cases. Thanks to Mirko Todorovski.
  • case4_dist
  • case18
  • case22
  • case69
  • case85
  • case141

1/26/17

• Add sources for MATPOWER User's Manual to docs/src.
• Move MOST User's Manual from docs to most/docs.

1/25/17

• Move case files to new data directory. Requires user to update MATLAB or Octave path.

1/24/17

• Update documentation in README.md, CHANGES.md, CONTRIBUTING.md, relnotes/RELEASE-NOTES-6.0.md, docs/MATPOWER-dev-guide.md to go along with move to GitHub and addition of installer.

1/23/17

• Add install_matpower() to assist with installation by updating MATLAB or Octave paths or providing the commands required to so.

1/16/17

• Support plotting of multiple nose curves in CPF by allowing option cpf.plot.bus to take on vector values.

1/14/17

• Add line for curtailed load to case_info() output.

1/5/17

• Fix bug #4 where some Q limits were not being respected by CPF when buses were converted to PQ by initial power flow run. Thanks to Shruti Rao.

1/4/17

• When genfuel field is present in mpc, load2disp() now augments it with dl entries for the dispatchable loads it adds.

1/3/17

• Change default implementation of active power line flow constraints (opf.flow_lim = 'P') to use flow directly, rather than square of flow, which is now a separate option, namely opf.flow_lim = '2'. Thanks to Nico Meyer-Huebner.

12/29/16

• Fix bug in converting older versions of MATPOWER options struct.

12/21/16

• Add Travis-CI integration. Thanks to Richard Lincoln.

Version 6.0 - Dec 16, 2016

12/16/16

• Released 6.0.
• Moved development to GitHub: https://github.com/MATPOWER/matpower.

12/9/16

• Bumped MIPS version to 1.2.2.
• Renamed MIPS from MATLAB Interior Point Solver to MATPOWER Interior Point Solver.

12/6/16

• Remove dependence of t_mpsolve() on presence of have_fcn() to detect PARDISO installation.
• Remove dependence of mpver() on presence of mostver().

Version 6.0b2 - Nov 1, 2016

11/1/16

• Released 6.0b2.

10/28/16

• Added new general event handling mechanism to continuation power flow (CPF), including handling of generator real and reactive power limits.

10/26/16

• Include support for MOSEK 8, some algorithms eliminated, others changed algorithm code set via mosek.lp_alg option.

10/19/16

• Improved robustness of infeasibility detection when pf.enforce_q_lims option is used.
• Add tests for power flow with pf.enforce_q_lims option.

10/14/16

• Fixed bugs in AC OPF solver code for fmincon, IPOPT, and Knitro involving shadow prices on variable bounds, when upper and lower bounds are equal (such as a voltage magnitude setpoint when opf.use_vg is 1). In IPOPT the prices are missing, and Knitro and fmincon can both return negative prices on the wrong constraint.

10/13/16

• Added opf.use_vg option to provide a convenient way to have the OPF respect the generator voltage setpoints specified in the gen matrix.

10/4/16

• Improve backward compatibility of mpoption(), allow it to handle old-style option vectors from earlier versions of MATPOWER, namely 3.2 and 4.0, and to accept on old style options vector with new-style name/value pair option overrides.
• INCOMPATIBLE CHANGE: Remove cpf.user_callback_args option and modify cpf.user_callback to allow for structs defining callback priority and args, in addition to just callback function name.
• Add user options for setting tolerances for target lambda detection and nose point detection, cpf.target_lam_tol and cpf.nose_tol, respectively.

9/27/16

• INCOMPATIBLE CHANGE: Changed name of cpf.error_tol option to cpf.adapt_step_tol.

9/22/16

• Update tests for compatibility with Optimization Toolbox 7.5 (R2016b), which removes active-set algorithm for quadprog() and active-set and simplex for linprog().
• Fix fatal error when using some SDP_PF functions when CPLEX is not installed.

9/19/16

• Fix dimension bug in makeBdc() when last bus is not connected (should never happen if bus is properly marked as type NONE). Thanks to Samuel Perkin.

8/15/16

• Fix a harmless bug in @opt_model where variable, constraint and cost sets indexed by a single variable would allocate a square matrix of starting and ending indices, rather than a simple vector. Thanks to Alberto Lamadrid for catching this.

7/18/16

• Extract computation of tangent vector from cpf_predictor() into cpf_tangent(), and call sequentially as needed.

7/11/16

• Add step size to CPF callback args and results logging.
• Add option cpf.adapt_step_damping to control oscillations in adaptive step size control for continuation power flow.

7/8/16

• Updated network reduction code to handle cases with radially connected external buses.

7/1/16

• Fix bug in cpf_default_callback() that sometimes resulted in plotting voltage at different buses for different parts of the curve when the bus was not explicitly specified with the cpf.plot.bus option.

6/23/16

• Bad bus numbers no longer cause a fatal error (after reporting the bad bus numbers) in case_info().
• Updated versions of qcqp_opf() and qcqp_opf() in extras/misc, from Cedric Josz.

6/10/16

• Fix bug in savecase() where single quotes were not escaped properly in bus names.
• Generator capability curve parameters that define a zero-reactive power line no longer cause a fatal error.

Version 6.0b1 - Jun 1, 2016

6/1/16

• Released 6.0b1.

5/27/16

• INCOMPATIBLE CHANGE: Removed fairmax() from the public interface by moving it inside uopf(), the only place it was used.

5/25/16

• Add contributed code from Camille Hamon to extras/maxloadlim for finding the loadability limits in power systems based on an optimal power flow using dispatchable loads.

5/24/16

• Fix bug in toggle_dclines() that resulted in fatal error when used with OPF with reactive power costs. Thanks to Irina Boiarchuk.
• Add option to call total_load() with full case struct, instead of separate bus and gen matrices.

5/18/16

• Add plot_mpc(), contributed by Paul Cuffe, to extras/misc. Plots an electrically meaningful drawing of a MATPOWER case.
• Add case145.m, IEEE 145 bus, 50 generator dynamic test case from https://labs.ece.uw.edu/pstca/dyn50/pg_tcadd50.htm.

5/17/16

• Add 9 new case files, 8 cases ranging from 1888 to 6515 buses representing the French system, and a 13,659-bus case representing parts of the of the European high voltage transmission network, stemming from the Pan European Grid Advanced Simulation and State Estimation (PEGASE) project. Thanks again to Cedric Josz and colleagues from the French Transmission System Operator.
• Add extras/misc/qcqp_opf.m, by Cedric Josz, et. al.

5/3/16

• Fix fatal bug in update_mupq() affecting cases where QMIN is greater than or equal to QC1MIN and QC2MIN (or QMAX is less than or equal to QC1MAX and QC2MAX) for all generators. Thanks Jose Miguel.

3/29/16

• Add support for quadprog() under GNU Octave.

3/3/16

• Copying a field containing a struct to a non-struct field with nested_struct_copy() now overwrites rather than causing a fatal error.

2/29/16

• Added option to call scale_load() with full case struct, with cost field in opt to indicate when to include cost scaling.

2/22/16

• Add major new feature: MATPOWER Optimal Scheduling Tool (MOST). See docs/MOST-manual.pdf for details.

2/18/16

• Updated code from 9/23/16 to turn off pesky CPLEX warnings to included CPLEX 12.6.3.

2/12/16

• Added Release History section to Appendix of manual.

1/29/16

• Added option to call makePTDF(), makeB(), and makeBdc() with mpc struct instead of individual baseMVA, bus, branch args. Suggested by Alberto Lamadrid.

1/26/16

• Introduced work-around and warning for crashes caused by strange behavior from MATLAB's ver() function when MATPOWER (or any other 3rd party toolbox with a Contents.m) is installed in a directory on the MATLAB path named matlab or optim (both case insensitive).

1/15/16

• Added feval_w_path() function for evaluating functions located at a specified path, outside of the MATLAB path.

1/14/16

• Added tests for loadcase() for m-file cases outside the MATLAB path.

1/6/16

• Added apply_changes() and idx_ct() to implement general method for applying modifications to an existing MATPOWER case.

11/5/15

• Use voltage dependent loads in both base and target injections to define continuation power flow transfer. Should fix issue with calculation of final loads.

11/4/15

• Fixed a bug in psse_convert_xfmr() where conversion of data for transformers with CZ=3 was done incorrectly. Thanks to Jose Marin and Yujia Zhu.

10/30/15

• Fixed a bug in cpf_default_callback() introduced with the experimental updates regarding ZIP loads on 4/14/15.

10/15/15

• Modified t_is() to handle matrix inputs of dimension greater than two.
• Added t_test_fcns() to test t_ok() and t_is() and manually check output of failed tests.
• Added tests to t_dcline() for an isolated generator bus connected to the rest of the system via a DC line. This works for AC and DC power flow and OPF, though you must set the isolated bus to be of type REF.

9/23/15

• Added code in cplex_options(), insolvablepfsos(), insolvablepfsos_limitQ() and yalmip_options() to turn off MATLAB:lang:badlyScopedReturnValue warning triggered by CPLEX when using MATLAB R2015b (8.6) and later.

7/16/15

• Added mpopt2qpopt() to provide common interface for creating options struct for mi/qps_matpower() from a MATPOWER options struct.
• Changed default solver order for LP, QP, MILP, MIQP problems to move Gurobi before CPLEX and BPMPD after OT and GLPK.

7/9/15

• Modified have_fcn() to return 0 and warn for unrecognized functionality, instead of producing fatal error.

6/19/15

• Fixed a fatal bug in psse_convert_xfmr() affecting transformers with CW and/or CZ equal to 1. Thanks to Matthias Resch.

5/18/15

• Fixed a crash in have_fcn() caused by changes in OPTI Toolbox v2.15 (or possibly v2.12).

4/24/15

• Commented out isolated bus 10287 in case3375wp.m.

4/16/15

• Added some caching to mpoption() and made minor changes to nested_struct_copy() to greatly decrease the overhead added by mpoption() when running many small problems.

4/14/15

• Added experimental code to lay foundation for handling ZIP load model in power flow (Newton, fast-decoupled only), continuation power flow, and optimal power flow (MIPS, fmincon, Knitro, IPOPT solvers only). Currently, ZIP loads can only be specified on a system-wide basis using the experimental options exp.sys_wide_zip_loads.pw and exp.sys_wide_zip_loads.qw. Tests in t/t_vdep_load().
• INCOMPATIBLE CHANGE: Changed the Sbus argument in newtonpf() from a vector to a function handle to a function that returns a vector.
• Added bus and area as possible values for load_zone argument to total_load(), which is now used to compute voltage dependent load values.

3/27/15

• Fixed issue where default value of feastol option was not being set correctly in mips() when called directly (or via qps_mips()) with feastol = 0. By default, MATPOWER option mips.feastol is set to zero but is normally replaced in mipsopf_solver() or dcopf_solver() with value of opf.violation option before calling mips(), thereby masking the problem.
• In miqps_glpk() variables of type B (binary) are converted to I (integer) with appropriate bounds, since some versions of GLPK do not natively handle type B.

3/24/15

• Added code to DC OPF to return success = 0 for cases where the matrix is singular (e.g. islanded system without slack).
• Fixed problem in have_fcn() where SeDuMi was turning off and leaving off all warnings.

Version 5.1 - Mar 20, 2015

3/20/15

• Released version 5.1.

3/19/15

• Added support for using PARDISO as linear solver for computing interior-point update steps in MIPS (v1.2), via new mplinsolver() function and mips.linsolver option.

3/18/15

• Added four new case files, ranging from 89 up to 9421 buses, representing parts of the European high voltage transmission network, stemming from the Pan European Grid Advanced Simulation and State Estimation (PEGASE) project. Thanks to Cedric Josz and colleagues from the French Transmission System Operator.
• Added network reduction toolbox to extras/reduction directory for creating smaller approximate network equivalents from a larger original case file. Thanks to Yujia Zhu and Daniel Tylavsky.

3/4/15

• Added variable type as an attribute to @opt_model, so you can now specify variables as C, I, or B (continuous, integer, or binary) when adding variables with add_vars() and getv() can optionally return a variable-type string suitable for passing to miqps_matpower() and friends.

2/26/15

• Minor speed improvements in various @opt_model functions from bypassing calls to substruct().

2/25/15

• Switch to more permissive 3-clause BSD license from GPL 3.0.

2/24/15

• Added function mpoption_info_intlinprog(), tag intlinprog to have_fcn() and optional intlinprog field to MATPOWER options.
• Added miqps_matpower(), a wrapper function for various solvers of mixed-integer linear and quadratic programs. Functionality implemented by miqps_cplex(), miqps_glpk(), miqps_gurobi(), miqps_mosek() and miqps_ot(). Added corresponding t/t_miqps_matpower() to test suite.

2/18/15

• Changed generator and dispatchable load sections in printpf() output to include off-line units, after all, it already has a Status column.

2/13/15

• Added explicit colors to plots in cpf_default_callback() so things look right in newer MATLAB versions (R2014b and later).

2/6/15

• Modified nested_struct_copy() to eliminate cellfun() call that was not supported in MATLAB 7.0.x. Noted that runcpf() also requires MATLAB 7.1 or later due to a call to cellfun(). Included code to skip certain tests that require that cellfun() functionality when running under MATLAB 7.0.x.

2/5/15

• Replaced regexp(... 'split') construct in mpoption() with regexp(... 'tokens') since it was causing fatal errors on MATLAB versions < 7.3, which did not have that feature.
• Fixed fatal error in when using fast-decoupled power flow on MATLAB versions < 7.3, caused by use of newer lu(... 'vector') construct.

2/3/15

• Added check to have_fcn() for installation of ipopt_auxdata.m when Ipopt >= 3.11.x is detected, to warn about incomplete installation and avoid a fatal error.

1/27/15

• Added online function reference, produced by m2html. Thanks to Shrirang Abhyankar.

1/26/15

• Fixed bug in hasPQcap() that resulted in ignoring generator capability curves if Q1MAX < Q2MAX or Q1MIN > Q2MIN (i.e. when the sloped portions cut off the left corners of the box constraints, rather than the right corners). Thanks to Irina Boiarchuk.

1/23/15

• Added mosek_symbcon() to define symbolic constants for setting MOSEK options. Updated MOSEK solver option values in help text for mpoption() to correspond to MOSEK v7.

1/22/15

• Added ability to toggle the availability of optional functionality using have_fcn().

1/21/15

• Fixed minor bug with poly2pwl(), affecting units with Pmax <= 0.
• Major update to have_fcn(), which now determines and caches version numbers and release dates for optional packages, used by mpver() and others.
• Fixed error in qps_mosek() in printout of selected optimizer when using MOSEK 7.

1/16/15

• Cleaned up and improved consistency of output in printpf() for generation and dispatchable load constraints.
• Modified runcpf() to gracefully handle the case when the base and target cases are identical (as opposed to getting lost in an infinite loop).

1/15/15

• Fixed bug in handling of interface flow limits, where multipliers on binding interface flow limits were off by a factor of the p.u. MVA base.
• Fixed sign error on multipliers on lower bound on constraints in qps_clp() and qps_glpk(). Modified a test in t_qps_matpower() to check for this.

1/14/15

• Added support for LP/QP solver CLP (COIN_OR Linear Programming). Use opf.dc.solver option CLP or qps_clp().
• Added note to README and home page about OPTI Toolbox by Jonathan Currie being an easy way to install some good solvers for Windows users.

1/13/15

• Updated t_opf_dc_ot() to remove the skipping of the checking of price results for the dual-simplex algorithm for all versions of MATLAB except R2014b, the first version that included the dual-simplex algorthm. For some reason, in this version it did not return any Lagrange multipliers!?!.
• Increment MATPOWER options version number to 5 (forgot to do it previously for 3, 4, and 5) and included code to update older options structs to current version.

1/7/15

• Improved detection of GLPK version in mpver() and GLPK availability in have_fcn(), now compatible with GLPK installed by OPTI Toolbox (https://www.inverseproblem.co.nz/OPTI/).

12/22/14

• Fixed fatal bug in toggle_dcline() when pretty-printing results. Thanks to Deep Kiran for reporting.

12/18/14

• Fixed fatal bug in case_info() for islands with no generation.

Version 5.0 - Dec 17, 2014

12/17/14

• Released version 5.0.

12/16/14

• Added unsupported functions check_feasibility.m, checklimits.m, loss2bus.m, make_opf_feasible.m, and makeBloss.m to extras/misc.
• Added section 9 "Miscellaneous MATPOWER Functions" to User's Manual.

12/15/14

• Added option for case_info() to print to a file. Added case_info() tests to t_island().

12/12/14

• Added code in psse_read() to work around a bug in MATLAB 7.3.
• Added private catchme tag (for internal use only) to have_fcn() to detect older versions of MATLAB and Octave that do not support the catch me syntax in try/catch constructs.
• Added private regexp_split tag (for internal use only) to have_fcn() to detect older versions of Octave that do not support the split argument to regexp().
• Updated to support Ipopt 3.11.x and later, which removed support for options.auxdata from the MEX file. Added private ipopt_auxdata tag (for internal use only) to have_fcn() to detect version 3.11.x or later.

12/4/14

• Added new option opf.init_from_mpc to force some solvers to use the starting point supplied in the MATPOWER case to initialize the optimization variables for the OPF, instead of creating its own starting point. Currently only implemented for Ipopt, Knitro and MIPS.
• INCOMPATIBLE CHANGE: Renamed cdf2matp() to cdf2mpc() and modified the interface to be consistent with psse2mpc().

12/2/14

• Added new option out.suppress_detail to quickly suppress all pretty-printed output except the system summary. By default, detailed output is automatically suppressed for systems larger than 500 buses.
• DC OPF formulation in opf_setup() now uses a single set of doubly-bounded constraints for flow limits, instead of two sets of upper bounded constraints.
• Updated to MIPS 1.1, which includes additional user-settable options: xi, sigma, z0, alpha_min, rho_min, rho_max, mu_threshold and max_stepsize.
• INCOMPATIBLE CHANGE: The name of the option to mips() to specify the maximum number of step-size reductions when step_control is on was changed from max_red to sc.red_it for consistency with other MATPOWER options.

11/18/14

• Updated case300.m with new conversion from original CDF file. No longer uses 9900 MVA as proxy for unlimited line capacity.

11/13/14

• Added capability for set_reorder() to automatically pad matrix or cell array before assignment of matrix or cell array with larger size in some dimensions. Added tests to t_ext2int2ext().

11/12/14

• Loads at isolated buses are no longer included in results from total_load().
• Fixed loads and shunts at isolated buses are no longer included in system and area summaries in printpf(). Line charging injections set to zero for DC power flow results.
• Added tests for printpf() in t_printpf.m.
• Changes to the internally indexed version of gencost now get properly copied back to externally indexed version by int2ext().
• Added tests in t_ext2int2ext() to confirm that e2i_data/field() and i2e_data/field() work for cell array as well as numerical array fields. Updated help text to reflect this feature.

11/11/14

• Added get_losses() function to compute losses, line charging reactive injections and their derivatives, as functions of bus voltages. Corresponding tests included in t_get_losses(), including example of loss sensitivity factors.
• Fixed bug in runpf.m that caused a crash for cases with pf.enforce_q_lims turned on and exactly two Q limit violations, one Qmax and one Qmin. Thanks to Jose Luis Marin.

11/4/14

• Modified behavior so setting out.all option to 0 is now ignored for pretty-printed output to files specified as FNAME argument to runpf(), runopf(), etc.

10/22/14

• Removed idx_area() and all code references to areas field in MATPOWER cases except those needed to support reading v1 case files and those required for backward compatibility of APIs. Removed unused (and formerly deprecated) areas field from version 2 case files that still included it.

10/21/14

• Fixed a bug in savecase() where a gencost matrix with extra columns of zeros resulted in a corrupted MATPOWER case file.
• Modified total_load() to return actual rather than nominal value for dispatchable loads by default, unless using the old-style string input for the 4th input arg. See help total_load for details.

10/16/14

• Reactive power output of multiple generators at a PQ bus no longer get re-allocated when running a power flow.

10/11/14

• Added fmincon_ip, linprog_ds and optimoptions to have_fcn() to test for availability of fmincon's interior point method (Optimization Toolbox 4.x +), linprog's dual simplex method (Optimization Toolbox 7.1 +), and optimoptions function for setting Optimization Toolbox options (Optimization Toolbox 6.3 +), respectively.
• Added handling of NaN values to t_is().
• INCOMPATIBLE CHANGE: Removed use of ot_opts field and replaced with linprog_opts and quadprog_opts fields in the OPT argument to qps_matpower() and qps_ot().
• Added optional linprog and quadprog fields to MATPOWER options struct, to allow setting of their options directly from mpoption(). Incremented MATPOWER options struct version to 2.
• Added tests for multiple linprog() algorithms to t_opf_dc_ot().

10/10/14

• Added sqp algorithm option for fmincon.alg, not suitable for large problems.

10/7/14

• Added toggle_softlims(), an extension to implement DC OPF branch flow soft limits. This should be useful in identifying the cause of infeasibility in some infeasible DC OPF problems. See help toggle_softlims for details.

9/24/14

• Fixed issue with failed tests in t_psse() on Windoze.

8/11/14

• Modified savecase() to save fields bus_name and genfuel (both cell arrays of strings) if present. This is an experimental feature and the design may change in future versions.
• Optionally return success flag from t_ok() and t_is().

8/4/14

• Additional improvements to correctly handling PSS/E RAW files for revisions 24-28.

7/30/14

• Fixed a bug in psse_convert() that resulted in incorrect bus voltage angles when importing from v29 or v30 files.
• Enhanced PSS/E import code to handle additional versions prior to v29, improve reporting of version being used for parsing. Default version when not explicit is now v23.

7/24/14

• Added line to cplex_options() to prevent default creation of clone1.log files when using parallel CPLEX routines (only effective for CPLEX 12.6.0.1 or later).
• Fixed fatal error when uopf() shuts down all gens attempting to satisfy Pmin limits.

7/23/14

• Fixed error in User's Manual description of LODF and further clarified text.

Version 5.0b1 - Jul 1, 2014

7/1/14

• Released version 5.0b1.

6/27/14

• Added support for LP solver GLPK which is built-in to Octave. Use opf.dc.solver option GLPK or qps_glpk().
• INCOMPATIBLE CHANGE: Removed optional max_it field from opt argument to qps_matpower() and qps_*() family of functions (except qps_mips()).

6/13/14

• Added ability for loadcase() to load MATPOWER case M-files that are not in the MATLAB path by specifying an explicit path in the input filename.

6/9/14

• Fixed memory issue resulting from nested om fields when repeatedly running an OPF using the results of a previous OPF as input. Thanks to Carlos Murillo-Sanchez.

5/23/14

• Added case5.m, a 5-bus, 5-generator example case from Rui Bo.
• Removed extras/psse2matpower.
• Fixes to printpf() to suppress printing of dispatchable load constraint section when there are no dispatchable loads and to never print line constraints for unconstrained lines.
• Fixed crash when using Knitro to solve cases with all lines unconstrained.
• Switched to [L,U,p,q] = lu(B,'vector') form for factorization in fast-decoupled power flow in fdpf(), resulting in ~5x speedup on some large systems. Thanks to Carlos Murillo-Sanchez.

5/6/14

• Modified savecase() to automatically add a comment line with the function name, and make sure the name is converted to a legal function name before saving.
• Further additions to PSS/E import code to handle repeated delimiters, accumulation of warnings to save in comments of converted file, improved consistency of verbose option, and some automated tests.

4/28/14

• Major revision of PSS/E import code to further improve robustness and include Octave support. Updated psse2mpc() to include direct saving of result to MATPOWER case file.
  • Added functions:
    • psse_parse()
    • psse_parse_line()
    • psse_parse_section()
  • Removed functions:
    • psse_count_lines()
    • psse_extract_data()
    • psse_read_section()

4/11/14

• Significant updates to PSS/E import code to improve robustness and (mostly) handle versions 29 to 33. Renamed the 4 functions ending in _33 by removing the _33.

4/7/14

• Added experimental feature, via function psse2mpc(), to import PSS/E RAW data (version 33) into a MATPOWER case file. Supporting functions include:
  • psse_convert_33()
  • psse_convert_hvdc_33()
  • psse_convert_xfmr_33()
  • psse_count_lines()
  • psse_extract_data()
  • psse_read_33()
  • psse_read_section()

3/28/14

• Enhanced extract_islands() to handle DC lines, custom fields and extraction of multiple islands into a single case struct.

3/11/14

• Fixed bugs in runpf() related to enforcing generator reactive power limits when all generators violate limits or when the slack bus is converted to PQ.

3/10/14

• Fixed bug in qps_gurobi() where return status values for NUMERIC and SUBOPTIMAL were swapped. Added INPROGRESS status. Thanks to Alberto Lamadrid for catching this.

3/2/14

• Fixed bug in case_info() that incorrectly included dispatchable loads in amount reported for min/max capacity for Generation.

2/28/14

• Updated toggle_dcline.m to work correctly for OPF cases with user supplied constraints and costs.

2/27/14

• Fixed bug in savecase() where the function name mistakenly included the path when the FNAME input included a path.

2/6/14

• Small tweak in connected_components() results in ~30x speedup for 62k bus network. (Reminder: Never access indexed rows of a large sparse matrix, always transpose and index the columns).

2/4/14

• Added check in qps_cplex() for undocumented exitstatus values returned by cplexlp() or cplexqp().

1/17/14

• Added Dan Molzahn's SDP_PF package, a set of applications of a semidefinite programming relaxation of the power flow equations, to the directory extras/sdp_pf.

1/16/14

• Added status option for 2nd argument to toggle_reserves() toggle_dcline() and toggle_iflims() as a convenient way to check the enabled/disabled status of these sets of callback functions.
• Removed extras/cpf since CPF is now part of the core.
• Added support for Dan Molzahn's SDP_PF package (coming soon).

1/15/14

• Modified handling of options for optional packages, added:
  • mpoption_info_cplex()
  • mpoption_info_fmincon()
  • mpoption_info_gurobi()
  • mpoption_info_ipopt()
  • mpoption_info_knitro()
  • mpoption_info_mosek()

1/8/14

• Updates to qps_cplex() and cplex_options() to fix verbose display issues with CPLEX 12.6.

1/3/14

• Added persistent variable to improve performance of have_fcn().
• Added support for Knitro v9.0.0, including new knitromatlab and ktrlink options to have_fcn(), to determine which Knitro interfaces are available.

12/10/13

• New MATPOWER options implementation based on options struct instead of options vector. INCOMPATIBLE CHANGE: In results struct returned by an OPF, the value of results.raw.output.alg is now a string, not an old-style numeric alg code.
• Gurobi now takes precendence over MOSEK when default solver is selected for DC OPFs or qps_matpower().

12/4/13

• Corrected error in Figure 6-5 "Total Cost Function for Negative Injection" in Dispatchable Loads section of User's Manual (slopes were labeled incorrectly).

11/15/13

• Added case_info().
• Modified connected_components() to sort returned groups by decreasing cardinality.

11/5/13

• Fixed a bug in MIPS where a near-singular matrix could produce an extremely large Newton step, resulting in incorrectly satisfying the relative feasibility criterion for successful termination.
• Improved the starting point created for Ipopt, Knitro and MIPS by dcopf_solver(), ipoptopf_solver(), ktropf_solver() and mipsopf_solver() for variables that are only bounded on one side.

10/11/13

• Removed support for MATLAB 6.x. Removed anon_fcns option from have_fcn(). Files removed:
  • fmincopf6_solver.m
  • mips6.m
  • mips6opf_solver.m
  • qps_mips6.m
  • t_mips6.m
• Removed support for constr and successive LP-based OPF solvers. Removed constr, lp, qp options from have_fcn(). Files removed:
  • copf_solver.m
  • fun_copf.m
  • grad_copf.m
  • LPconstr.m
  • LPeqslvr.m
  • lpopf_solver.m
  • LPrelax.m
  • LPsetup.m
  • mp_lp.m
  • mp_qp.m
  • t/t_opf_constr.m
  • t/t_opf_lp_den.m
  • t/t_opf_lp_spf.m
  • t/t_opf_lp_spr.m

9/20/13

• Added continuation power flow, runcpf(), with tangent predictor and Newton method corrector, based on code contributed by Shrirang Abhyankar and Alex Flueck.

9/5/13

• Fix in smartmkt() to avoid crash following non-convergent uopf when mkt.lim.P.max_offer is not defined.

9/3/13

• Fixed bug (typo) in auction() that could affect cases with a lower limit on the cleared bid price.

7/30/13

• Extended modcost() to optionally accept a vector of shift/scale factors, instead of just a scalar.

6/7/13

• Made non-convergent results more obvious by not printing the standard output tables (can be overridden with new OUT_FORCE option) and making the "did not converge" more prominent.

5/1/13

• Changed behavior of branch angle difference limits so that 0 is interpreted as unbounded only if both ANGMIN and ANGMAX are zero. Added note about this to docs in various places.

4/26/13

• DC OPF now correctly sets voltage magnitudes to 1 p.u. in results.

3/29/13

• Performance optimizations in @opt_model for cases with large numbers of variable sets and linear constraints or costs specified as entire rows (all columns as opposed to specific var sets).

3/13/13

• Added to scale_load() the option to scale the gencost (specifically the quantity axis of the marginal cost function) corresponding to any modified dispatchable load. Simply add gencost as additional input and output args.
• Empty got and expected arguments to t_is() now count as a passing test instead of an error, as long as the dimensions match.

2/12/13

• Fixed bug causing value of opt.verbose to be ignored in qps_gurobi().

12/14/12

• Removed code in fmincopf() that attempts to find an interior starting point when using the interior point solver. It did not seem to help and caused errors for certain cases with DC lines (and probably other extensions).

10/1/12

• Updates to have_fcn() and mpver() to better handle case where Optimization Toolbox is installed, but with no valid license.

8/30/12

• Major speed-up in @opt_model/linear_constraints() by building transpose of A (assigning to full columns) then transposing back as opposed to building A directly (assigning full rows).

8/1/12

• Added function margcost() for computing the marginal cost of generation.

7/20/12

• Added utility function @opt_model/describe_idx() to identify variable, constraint or cost row indices to aid in debugging.

7/18/12

• Made N optional field (default is identity matrix) in @opt_model/add_costs().
• Added missing optional 2nd arg to @opt_model/build_cost_params().

6/26/12

• Fixed a bug in the new @opt_model/add_vars() when adding a var set of dimension zero.

6/18/12

• Updated Gurobi interface for compatibility with native MATLAB support introduced in Gurobi 5. INCOMPATIBLE CHANGE: No longer works with older Gurobi 4.x/ gurobi_mex() interface.

5/3/12

• Reimplementated @opf_model class as sub-class of the new @opt_model class, which supports indexed named sets of variables, constraints and costs.

5/2/12

• In opf_setup(), take magnitude of initial voltages at generator buses from bus matrix (VM), not gen matrix (VG).

4/30/12

• Fixed a bug in int2ext() where converting a case to internal ordering before calling runpf() or runopf() could result in a fatal error due to mismatched number of columns in internal and external versions of data matrices. Thanks to Nasiruzzaman and Shiyang Li for reporting and detailing the issue.
• Fixed fatal bug in MIPS for unconstrained, scalar problems. Thanks to Han Na Gwon. Bumped MIPS version to 1.0.1.

3/14/12

• Fixed a bug in runpf() where it was using the wrong initial voltage magnitude for generator buses marked as PQ buses. Power flow of solved case was not converging in zero iterations as expected.

2/29/12

• Added a tolerance for detecting violated Q limits in runpf() when ENFORCE_Q_LIMS is true. Suggested by Hongxing Ye.

1/31/12

• Added utilities to help in working with networks with islands, find_islands(), extract_islands() and connected_components() and corresponding test file t/t_islands().

1/24/12

• Added option to makeJac() to return full Jacobian instead of reduced version used in Newton power flow updates.

1/16/12

• Added new function gurobiver() for retreiving/printing Gurobi and Gurobi_MEX version information, since it is used multiple places.

1/10/12

• Moved the building of Ybus outside the reactive limit enforcement loop in runpf(). Suggested by Shiyang Li.

1/4/12

• Running a power flow for a case with DC lines but no gencost no longer causes an error.

12/14/11

• Modified t/t_opf_fmincon.m to use active-set method for testing fmincopf for MATLAB versions 7.6-7.9, since fmincon's interior point solver (now default) was not accurate enough in these versions.

Version 4.1 - Dec 14, 2011

12/14/11

• Released version 4.1.
• Fixed bug in check for ENFORCE_Q_LIMS with multiple slacks in runpf().
• Moved printing of power flow solver name into runpf() so it doesn't get repeated when ENFORCE_Q_LIMS is on.

12/9/11

• Fixed problem with qps_cplex() when H matrix is not perfectly numerically symmetric.

12/8/11

• Added basic DC line modeling capability. See help for toggle_dcline() for details.

12/1/11

• Removed deprecated functions in @opf_model, gen_lin_N(), get_nln_N(), get_var_N(), use getN() instead.
• Removed all references to deprecated option OUT_RAW.

11/15/11

• Fixed a crashing bug in computation of quadratic user-defined costs. Thanks to Stefanos Delikaraoglou.

11/11/11

• Changed default DC OPF/LP/QP solver precedence in dcopf_solver() and qps_matpower() to the following: CPLEX, MOSEK, Gurobi, BPMPD, Opt Tbx, MIPS.
• Minor enhancements to cdf2matp(), including saving of bus names. Thanks to Alvaro Jaramillo Duque.

11/09/11

• Refactored ext2int() and int2ext() into additional functions e2i_field(), e2i_data(), i2e_field() and i2e_data() to clean things up and prepare for the ability to automatically re-order data in cell arrays.

10/31/11

• Added three case files, all more recent variations of the Polish system: case3012wp.m, case3120sp.m and case3375wp.m. Thanks to Roman Korab roman.korab@polsl.pl.

9/28/11

• Increased threshold value used to filter constraint shadow prices in printpf().
• In savecase() increased precision of values saved in M-file case files

9/16/11

• Fixed that qps_cplex() would not print progress even with VERBOSE > 0 with CPLEX 12.3.

7/26/11

• Fix in qps_cplex() for changed sign on multipliers with CPLEX 12.3 vs CPLEX 12.2.

7/25/11

• Fixed bug in compare_case() that would cause some column names for the branch matrix to be incorrectly reported.

7/7/11

• In scale_load(), when no load_zone is specified, it no longer incorrectly misses Q-only load buses.

7/5/11

• Added support for the Gurobi optimizer for large-scale linear and quadratic programming. To use Gurobi for the DC OPF, set OPF_ALG_DC = 700. Gurobi's various solvers can be selected via MATPOWER's GRB_METHOD option. Requires the Gurobi libraries available from https://www.gurobi.com/ and the Gurobi MEX interface available from http://www.convexoptimization.com/ wikimization/index.php/Gurobi_mex.
• Added function qps_gurobi() for solving QP and LP problems using the common QP solver interface used in MATPOWER. The qps_matpower() function also includes the option to use Gurobi.
• Changed order of precendence of installed DC OPF solvers (i.e. LP/QP solvers) to Gurobi, MOSEK, CPLEX, BPMPD, then MIPS.

6/29/11

• Updated t_is() to properly print when result includes NaNs.

6/17/11

• Changed FMC_ALG option default to 4, fmincon defaults to using an interior-point method with user-supplied Hessians instead of an active set method.
• Added support for the KNITRO optimization solver for large scale non-linear problems. Use OPF_ALG = 600 for AC OPF. Requires the Optimization Toolbox from The MathWorks and the KNITRO libraries, available from http://www.ziena.com/. (Subsequently acquired by Artelys, https://www.artelys.com/.)

6/16/11

• Complete rewrite of update_mupq.m. Should fix problems caused by non-zero multipliers on non-binding generator limits.

5/17/11

• Updated runpf() and pfsoln() to properly handle slack for power flow cases with islands and multiple reference buses. (Note: This does not include the case where ENFORCE_Q_LIMS results in temporarily converting a reference bus to a PQ bus and automatically finding a new suitable slack bus.)

5/16/11

• Pretty printed output from printpf() now includes a * after the voltage angle in the bus section for reference buses.

3/31/11

• Default value for ramp rates for dispatchable loads now set to Inf in load2disp.m.

3/18/11

• Fixed bug in toggle_reserves.m that computed the prices in results.reserves.prc incorrectly.

Version 4.0 - Feb 7, 2011

2/16/11

• Oops! Neglected to include Carlos as co-author on User's Manual. Updated 4.0 distribution and web-site with corrected manual.pdf. Sorry about that Carlos!

2/7/11

• Released version 4.0.

1/18/11

• Added quadprog_ls option to have_fcn() to check for availability of version of quadprog() with large scale solver.
• Modified qps_ot() to set default options based on capabilities of version of Optimization Toolbox.

12/16/10

• Fixed bug in qps_cplex() where an infeasible problem resulted in a fatal error.
• Fixed bug in qps_mosek() where exit flag was indicating success for infeasible solutions.
• Fixed bug in dcopf_solver() where an infeasible problem found by CPLEX would result in a fatal error.

Version 4.0b5 - Dec 13, 2010

12/13/10

• Released version 4.0b5.

12/2/10

• Added to opf_setup() a better check on when specified generalized cost parameters are compatible with DC OPF.
• Improved output of t_is(). Includes only elements violating tolerance.

11/30/10

• Fixed bug in opf_execute() related to automatic conversion of single-block piecewise linear costs to linear polynomial costs. Affected indexing of the Va, Vm, Pg and Qg portions of results.x and raw.xr.

11/24/10

• Added support for the MOSEK optimizer for large-scale linear and quadratic programming. To use MOSEK for the DC OPF, set OPF_ALG_DC = 600. Specific LP algorithms can be selected by the MOSEK_LP_ALG option. Requires the MATLAB interface for MOSEK, available from https://www.mosek.com/.
• Added function qps_mosek() for solving QP and LP problems using the common QP solver interface used in MATPOWER. The qps_matpower() function also includes the option to use MOSEK.

11/16/10

• Fixed bug in opf_setup() where indexing data for branch angle difference limits was not being saved in the case of DC OPF.
• Added support for the IBM ILOG CPLEX optimizer for large scale linear and quadratic programming. To use CPLEX for the DC OPF, set OPF_ALG_DC = 500 and choose the specific CPLEX solver using options CPLEX_LPMETHOD and CPLEX_QPMETHOD. Requires the MATLAB interface for CPLEX, available from https://www.ibm.com/analytics/cplex-optimizer.
• Added function qps_cplex() for using CPLEX to solve QP and LP problems using the common QP solver interface used in MATPOWER. The qps_matpower() function also includes the option to use CPLEX.

11/9/10

• Fixed an indexing bug in dcopf_solver() affecting cases with a mix of piecewise linear and polynomial costs (unless the polynomial costs came after all of the pwl costs).

10/12/10

• Performance optimization in opf_consfcn(). Assign sparse cols then transpose instead of assigning sparse rows. Results in >2x speed up for this function on case2935, ~10x on case42k.

7/20/10

• Made some updates to extras/psse2matpower. Added/fixed some comments, text output, switched to Parse::Text::parse_line for bus data to fix problem caused by certain characters (e.g. / ,) in bus names. Fixed error in switched shunt data (using data from wrong column). Modified to no longer comment out isolated buses, since it doesn't remove corresponding gens/branches.

6/29/10

• Fixed bug in uopf(). Was not calling printpf() when called with no output arguments. Thanks to V. Ravikumar Pandi.

6/25/10

• Added makeJac(), a utility function to form the power flow Jacobian.
• Modified makeYbus() to allow for single MATPOWER case struct as input.
• Added load2disp() to convert fixed loads to dispatchable loads.

6/1/10

• Added modcost() and tests for modcost() and totcost().

Version 4.0b4 - May 21, 2010

5/21/10

• Released version 4.0b4.

5/18/10

• Added support for the IPOPT interior point optimizer for large scale non-linear optimization. Use OPF_ALG = 580 and OPF_ALG_DC = 400 for AC and DC OPF, respectively. Requires the MATLAB MEX interface for IPOPT, available from https://github.com/coin-or/Ipopt.

5/13/10

• Modified input args for Hessian evaluation function for MIPS. Requires cost_mult as 3rd argument.
• Added check for invalid gencost MODEL in opf_setup().

5/5/10

• Added RETURN_RAW_DER option to control when OPF solver returns constraint, Jacobian and objective function gradient and Hessian information.

5/4/10

• Refactored portions of opf() into opf_setup() and opf_execute().

Version 4.0b3 - Apr 19, 2010

4/19/10

• Released version 4.0b3.
• Changed licensing to GNU General Public license. See LICENSE and COPYING files for details.
• Added in extras sub-directory psse2matpower Perl script for converting PSS/E data files to MATPOWER case files.

4/6/10

• Added anon_fcns to have_fcn() to check for anonymous function capability to avoid direct MATLAB version checks in code.
• GNU Octave compatibility! (tested with Octave 3.2.3) Added octave to have_fcn() to check when code is running under Octave instead of MATLAB.

3/23/09

• Fixed bug in smart market code that caused it to die for cases with non-consecutive bus numbers.
• Removed consecutive bus number requirement for scale_load() and total_load() functions.

Version 4.0b2 - Mar 19, 2010

3/19/10

• Released version 4.0b2.

3/12/10

• Incorporated significant updates to User's Manual (docs/manual.pdf).

3/10/10

• Added optional input arg to mpver() and other *ver() functions to trigger return of entire version struct with Name, Version, Release and Date (similar to MATLAB's ver() function).
• Massive help text update to more closely match MathWorks conventions; function names in ALL CAPS, See also ..., Examples, etc.
• Added printing of MATPOWER and MIPS version lines to verbose output.

2/23/10

• For @opf_model, deprecated get_var_N(), get_lin_N() and get_nln_N() methods, replaced with single getN() method. Added compute_cost().
• Fixed per unit bug with reserve costs and prices in toggle_reserves().
• Added cost field to OPF results struct with final values of user-defined costs, by named set.
• Added totalcost field to results.reserves for OPF with reserves case, see toggle_reserves() and runopf_w_res().

2/2/10

• Deprecated unused options SPARSE_QP and OUT_RAW.

1/27/10

• Renamed functions used to compute AC OPF cost, constraints and hessian, since they are used by more than fmincon:
  • costfmin --> opf_costfcn
  • consfmin --> opf_consfcn
  • hessfmin --> opf_hessfcn

1/26/10

• Added OPF algorithm code to output of OPF in results.raw.output.alg.

1/25/10

• Switched to using qps_matpower() instead of mp_qp()/mp_lp() for solving the DC OPF.
• Added new top-level wrapper function for MATPOWER's QP solver, called qps_matpower(), with calling syntax similar to quadprog() from the Optimization Toolbox, to replace mp_qp() and mp_lp(). The main difference from the quadprog() API is that the constraints are specified as l <= A*x <= u, instead of A*x <= b and Aeq*x == beq. This new function allows for algorithm specific input options, return of the final objective function value and more detailed output reporting, such as the history for the trajectory returned by MIPS. The old functions, mp_qp() and mp_lp() are now simply wrappers around qps_matpower() and have been deprecated.
• Added qps_bpmpd(), qps_mips() and qps_ot(), with interface that matches qps_matpower() to handle implementation for BPMPD_MEX, MIPS and Optimization Toolbox solvers, respectively.
• Fixed a bug that could result in incorrect multipliers on variable bounds from the DC OPF with user-supplied linear constraints.

1/19/10

• Renamed the pure-MATLAB interior point solver from PDIPM to MIPS (MATLAB Interior Point Solver).

1/18/10

• Changed order of input args to pdipm(), added option for single input struct (like fmincon), more documentation, all constraints are now optional, returns exitflag = -1 for 'numerically failed', output includes message field, lambda only includes relevant fields. Added tests for pdipm as standalone solver.

1/12/10

• Added saving history of trajectory of obj, feascond, gradcond, compcond, costcond, etc. for pdipm solver. See results.raw.output.hist.

Version 4.0b1 - Dec 24, 2009

12/24/09

• Released version 4.0b1.

12/18/09

• Make OPF_ALG default to 540 then 560 (no 500 MINOPF) and OPF_ALG_DC default to 200 (no 100 BPMPD_MEX).

12/10/09

• Fixed a bug, where calling opf() directly with individual input data matrices in version 2 format resulted in the matrices being inadvertently run through a version 1 to version 2 format conversion, stripping out generator capability curves, ramp limits and branch angle difference limits before setting up and running the OPF. The fix for this subtle bug involved changing loadcase to not assume that an input struct without a version field is in version 1 format. It now checks the size of the gen matrix to make the determination.

12/8/09

• Misc cleanup based on mlint suggestions, including:
  • Replaced | with || and & with && where appropriate.
  • Removed unnecessary sprintf (and fprintf!?) calls from args to error().
  • Replaced j (=sqrt(-1)) with 1j for speed and robustness.
  • Replaced unecessary brackets [] with parentheses.
  • Made sure all calls to exist() have 2 args.
  • more

12/4/09

• Fixed bug in savecase[] for cases where A or N matrix is a single row.

11/4/09

• Removed unnecessary return statement at end of all M-files. If anything it should be an end statement, but even that is optional, so we just let functions get terminated by the end-of-file or another function declaration.

11/3/09

• Removed genform.m, runcomp.m and t/t_opf.m.
• Renamed compare.m to compare_case.m and updated it to work with unsolved cases, solved PF cases and solved OPF cases.

10/9/09

• Added ability to specify interface flow limits (based on DC model flows).

7/10/09

• Removed sparse_qp and sparse_lp from have_fcn().
• Major speed-up in @opf_model/linear_constraints() for large problems (esp. DC OPF) and various other optimizations from profiling code.

7/7/09

• Fixed bug in opf.m introduced by automatic conversion of single-block piecewise linear costs to linear polynomial costs.

5/27/09

• Added total_load.m to provide convenient way to retreive the total load for the entire system, a specific zone or bus with options to include just fixed load, just dispatchable load, or both.

5/19/09

• The results struct returned by power flow or optimal power flow is now a strict superset of a MATPOWER case struct.
• Extended ext2int.m and int2ext.m to handle converting entire case struct in a single call, storing the re-indexing info in the struct, using it to reorder other data structures/fields, execute callbacks to convert additional user data.
• Split userfcn callbacks into multiple stages. Currently there are five: ext2int, formulation, int2ext, printpf, savecase.

4/14/09

• Deprecated use of areas data matrix. Removed it everywhere possible without breaking backward compatibility with version 1 case files, which required it.
• INCOMPATIBLE CHANGE: Calling loadcase() with 5 output arguments is now interpreted as ...
  • [baseMVA, bus, gen, branch, gencost] = loadcase(casefile) ... instead of ...
  • [baseMVA, bus, gen, branch, info] = loadcase(casefile)

3/25/09

• Added add_userfcn.m as to make it easy to add a new userfcn to a case struct, whether or not it already has any. Modified the fixed reserve example to use this.

3/24/09

• Added step-controlled PDIPM variant (OPF_ALG = 565) of AC OPF solver.

3/19/09

• Added pdipm_qp() as a new QP/LP solver based on the pure MATLAB PDIPM solver used for AC OPFs.
• Added option OPF_ALG_DC and refactored some code to allow the user to select the desired solver for DC OPF.
• Added code to opf.m to automatically convert single-block piecewise linear costs to linear polynomial costs to reduce the number of variables and constraints in the problem.

3/17/09

• Numerous code optimizations based on profiling code, e.g. changed all calls to spdiags() to equivalent call to sparse().

3/13/09

• Added a pure MATLAB implementation of the PDIPM (primal-dual interior point method) solver for the AC OPF. Now the default solver (OPF_ALG = 560) if there are no optional MEX solvers installed.
• Modified fmincopf, copf, lpopf and dcopf to allow branch RATE_A = 0 or RATE_A > 1e10 to mean the branch is unconstrained (not included at all in inequality constraints). TSPOPF solvers already did this. Included in tests.

3/11/09

• Allow userfcn to be an array, with elements processed in order.

1/14/09

• New version of case39.m with some additional versions, created from documented sources.

7/3/08

• Added a top level program, runopf_w_res(), to solve an OPF with fixed reserve requirements. This is a good example of how to use the new userfcn mechanism to add vars, costs, constraints to an OPF (see also toggle_reserves.m and t_case30_userfcns.m).
• Added option to return solution as a results struct to runpf(), runopf(), runuopf(), rundcpf(), rundcopf(), runduopf().
• Updated uopf.m so input/output args match opf.m.
• Added option ENFORCE_Q_LIMS = 2 for runpf to allow one-at-a-time conversion of buses from PV to PQ for generator reactive power limit violations.
• Fixed a (new) bug which caused the DC OPF solver to crash on problems with only polynomial costs.
• Added userdata to @opf_model object.

6/10/08

• Added new way to specify user vars, constraints, costs via userfcn for OPF.
• Added option to return OPF results in a struct.
• Added defaults for user cost params in fparm and H, making them optional even when N and Cw are given.

5/22/08

• Major refactorization of OPF implementation with shared code for a generalized formulation that includes the DC OPF as well as the legacy solvers based on constr and LPconstr.
• Deprecated OPF_ALG values 100, 120, 140, 160, 200, 220, 240, and 260 in favor of the new generalized formulation equivalents 300, 320, 340 and 360.
• Removed options OPF_ALG_POLY, OPF_ALG_PWL and OPF_POLY2PWL_PTS.

5/2/08

• Move OPF input argument processing into opf_args.m, now shared by opf.m, dcopf.m, fmincopf.m, mopf.m and tspopf.m.
• Rewrote the DC OPF to include generalized user constraints, costs and extra vars (like AC formulation). Note, that if A or N have enough columns for the AC formulation, opf.m assumes they are for the AC OPF and strips out the extra columns before passing to dcopf.m.
• Added the ability to read and save generalized OPF user constraints, costs and var limits in case struct.
• Modified savecase.m to include saving of MU_ANGMIN, MU_ANGMAX columns of branch matrix.

3/13/08

• Added a function makeLODF.m to compute line outage distribution factors.
• Added a function scale_load.m to scale load by zones.

3/7/08

• Updated fmincopf and mpoption to work with version 4 of Optimization Toolbox. Added option FMC_ALG for select between fmincon's active set method and variations of the new interior-point algorithm.
• Added functions to compute second derivatives of constraints and cost (explicit Hessian evaluation) for use with interior-point solvers, etc.
• INCOMPATIBLE CHANGE: dAbr_dV() now gives partial derivatives of the squared magnitudes of flows w.r.t. V, as opposed to the magnitudes.
• Modified the implementation of all flow constraints for fmincon (and constr) to use squared flow limits instead of absolute value to correctly avoid div-by-zero errors in computing gradients, and to prepare for implementing Hessian code. Shadow prices still correspond to absolute value limits.
• Fixed bug in fmincon (and constr and LP) based OPF which allowed an active power flow limit to be violated when using OPF_FLOW_LIM = 1 (missing absolute value).

3/3/08

• INCOMPATIBLE CHANGE: Changed input argument order for uopf and added general linear constraints and generalized costs.

1/10/08

• Significant speed improvements in makeYbus.m and makeBdc.m.

Version 3.2 - Sep 21, 2007

9/21/07

• Released version 3.2.

9/17/07

• Added option to cdf2matp.m to specify output case file version.

9/7/07

• Fixed bug in pfsoln.m which caused incorrect value for Qg when Qmin == Qmax for all generators at a bus in power flow solution.
• Added 5 larger scale (> 2000 bus) cases for Polish system. Thanks to Roman Korab roman.korab@polsl.pl.
• Modified default OPF algorithm selection to use PDIPMOPF if available and MINOPF is not. Order of precedence is now 500, 540, 520, 100/200.

7/6/07

• Added ability in opf.m and fmincopf.m to specify initial value and bounds on user variables via new input arguments z0, zl, zh.

6/22/07

• INCOMPATIBLE CHANGE: Name of option 24 in mpoption change from OPF_P_LINE_LIM to OPF_FLOW_LIM.
• Added option to use current magnitude instead of apparent power for line flow limits. Set OPF_FLOW_LIM to 2.

6/21/07

• INCOMPATIBLE CHANGE: Changed the sign convention used for phase shifters to be consistent with PTI, PowerWorld, PSAT, etc. E.g. A phase shift of 10 deg now means the voltage at the "to" end is delayed by 10 degrees.

6/15/07

• Added t_auction_pdipm.m and renamed t_auction.m to t_auction_minopf.m.

6/8/07

• Updated have_fcn.m to check for appropriate minimum versions of MATLAB, for TSPOPF.

6/7/07

• Modified printpf.m to correctly detect binding line limits when a limit of 0 is taken to mean unconstrained.
• Fixed bugs in handling of multipliers for general PQ capability curves in fmincopf.m (also in mopf.m and tspopf.m).
• Refactored t_opf.m into separate files for each solver.
• Modified opf.m, mpoption.m, mpver.m, have_fcn.m to include support for TSPOPF, a new optional package of OPF solvers.

9/29/06

• Added check to runpf.m for case where all gens hit Q limits when ENFORCE_Q_LIMS is enabled.

Version 3.1b2 - Sep 15, 2006

9/15/06

• Released version 3.1b2.

9/12/06

• Added makePDFT.m which builds the DC PTDF matrix for a specified slack distribution.

8/16/06

• Added optional outputs xr, pimul to fmincopf and opf.m to make them fully interchangeable with mopf.m.

8/15/06

• Added branch angle difference constraints to general OPF formulation in fmincopf.m (and mopf.m). These limits are specified by non-zero values in the ANGMIN and/or ANGMAX columns of the branch matrix. If limits are provided in the data, they are enforced by default. This can be overridden by setting the OPF_IGNORE_ANG_LIM option to 1 using mpoption.
• Fixed (invisible) bug with multipliers of lower bounded linear constraints in fmincopf.m.

Version 3.1b1 - Aug 1, 2006

8/1/06

• Released version 3.1b1.

4/28/06

• Fixed mpver.m so it will properly handle case where the Optimization Toolbox is not installed.

3/15/06

• INCOMPATIBLE CHANGE: Updated opf.m, fmincopf.m, costfmin.m, consfmin.m to be able to be compatible with latest MINOPF. User supplied A matrix for general linear constraints no longer includes columns for y variables (helper vars for piecewise linear gen costs), and now requires columns for all x (OPF) variables. Added generalized cost model and generator PQ capability curves.
• Modified savecase.m to always save MAT files with -V6 under newer MATLAB versions.
• Added a number of tests to t_opf.m for MINOPF and fmincopf for generalized costs and additional linear constraints. Added test for fmincopf for generator PQ capability curves.

3/10/06

• Added baseKV data to case118.m from PSAP file https://labs.ece.uw.edu/pstca/pf118/ieee118psp.txt.

3/8/06

• Renamed col 5 of gencost from N to NCOST everywhere.

10/14/05

• Updated version 2 case file format to modify generator PQ capability curve specifications.
• Added hasPQcap.m and test for gen PQ capability curve in OPF.

8/22/05

• Added OPF_IGNORE_ANG_LIM option to mpoption.m.

8/5/05

• Modified identification of binding constraints in printpf.m. A constraint is now considered to be binding if the tolerance is less than or equal to OPF_VIOLATION tolerance -OR- if the corresponding Kuhn-Tucker multiplier is non-zero. This allows binding generator capability curves to be reported via multipliers on Pg and Qg limits.

7/8/05

• Updated loadcase.m, savecase.m, idx_bus.m, idx_gen.m, caseformat.m and tests for version 2 case file format, which includes piece-wise linear generator capability curves, generator ramp rates and branch angle difference limits.

Version 3.0.0 - Feb 14, 2005

2/14/05

• Released version 3.0.0.

2/3/05

• In mp_lp.m and mp_qp.m, on Windows it now makes sure BPMPD_MEX is not called in verbose mode which causes a MATLAB crash.

Version 3.0b4 - Jan 28, 2005

1/28/05

• Released version 3.0b4.

1/27/05

• Added case6ww.m and case4gs.m.
• Minor modifications to printpf.m to handle larger bus numbers.

1/26/05

• Minor changes to uopf.m to make sure it plays nicely with dispatchable loads.

1/25/05

• Major updates to user manual.

1/24/05

• Switched to using the new isload() to check for dispatchable load.
• For dispatchable loads, switched from using PG and QG to PMIN and either QMIN (for inductive loads) or QMAX (for capacitive loads) to define the constant power factor constraint. This prevents the power factor information from being lost when it is dispatched to zero. If the initial values of PG and QG are not consistent with the ratio defined by PMIN and the appropriate Q limit it gives an error. This is to prevent a user from unknowingly using a case file which would have defined a different power factor constraint under previous versions of MATPOWER. If both QMIN and QMAX are zero, it no longer includes the redundant unity power factor constraint.

1/20/05

• Updated printpf.m to display dispatchable loads and generators separately. Reorganized the area summary section and corrected the net exports value (subtracted half of tie-line loss) to make the numbers add up correctly.

1/18/05

• Added to runpf.m the ability to enforce generator reactive power limits by allowing the voltage to deviate from the set-point. This option is controlled by the new ENFORCE_Q_LIMS option, which is off by default. Thanks to Mu Lin of Lincoln University, New Zealand whose contributions inspired this feature.
• Modified pfsoln.m to divide reactive power dispatch between multiple generators at a bus in proportion to each gen's reactive power range, as opposed to equally. This means that all generators at a bus will reach their upper (or lower) limits simultaneously.
• Added generator status column to generator section of printpf.m output. Fixed bugs where non-zero output of decommitted generators was displayed and included in generation totals in generator and bus sections.

1/14/05

• Moved some setting of MNS_* default options from opf.m to mopf.m.
• Eliminated unused output args in dcopf.m.
• Modified printpf.m to zero out reactive generator output for DC cases and to use OPF_VIOLATION tolerance to detect binding constraints, as opposed to non-zero Kuhn-Tucker multipliers.

1/12/05

• Modified bpmpd portion of mp_qp.m and mp_lp.m to use default value for TFEAS2 and eliminate variable limits which appear to be artificial large values used to indicate free variables.

1/4/05

• Fixed potential bug in dimensions of Yf and Yt created in makeYbus.m.

12/17/04

• Added feasibility check to mp_lp.m and mp_qp.m to work around a recently discovered bug in BPMPD_MEX 2.21 where it sometimes returns an incorrect (infeasible) solution for a DC OPF problem. This bug has yet to be encountered in any other context.

12/13/04

• Added mpver.m to print version information.

9/23/04

• Fixed bugs in cdf2matp.m which prevented it from working at all when not specifying both input parameters and caused it to sometimes not add the warnings at the end of the file.
• Fixed typo in name of lower bound input argument in opf.m. Only affected those calling OPF directly with extra linear constraints.

Version 3.0b3 - Sep 20, 2004

9/20/04

• Released version 3.0b3.
• Generated clean versions of all included case files using latest cdf2matp and savecase. Added documentation for source of data for case files.
• More enhancements to cdf2matp.m. Adds comments at beginning, appends conversion warnings as comments at end of file. Uses savecase.m to save the data.
• Updated savecase.m to use %g instead of %f many places, correctly handle multi-line comments, include headers for extra columns for solved cases. Optionally returns filename with extension.

9/17/04

• Fixed bug in grad_std.m, introduced in 3.0b2, which prevented constr and LP-based OPF solvers from working for polynomial cost functions.

9/15/04

• In cdf2matp.m, added input args, updated docs, switched to named indexing of data matrices, new method for creating gen costs.
• Documentation fixes and additions from Pan Wei.

Version 3.0b2 - Sep 7, 2004

9/7/04

• Released version 3.0b2.
• Added OPF_P_LINE_LIM option to mpoptions to use active power instead of apparent power for line limits. Thanks to Pan Wei for the suggestion and some code.

9/1/04

• Fixed bug in savecase.m introduced when making areas and gencost optional.
• Updated opf_slvr.m with options for MINOS and fmincon.
• Removed option 15 OPF_NEQ from docs (not a user option). Removed option 52 VAR_LOAD_PF (unused, always behaves as if this option were 1). Changed semantics and default value for option 51 SPARSE_QP. By default (value = 1) it will use sparse matrices if a sparse QP/LP solver is available and full matrices otherwise. Setting the value to 0 will force it to use full matrices even with a sparse-capable solver.
• Cleaned up checking for optional functionality, and fixed a bug that would miss MEX files if there was an identically named directory by adding have_fcn.m.

Version 3.0b1 - Aug 25, 2004

8/25/04

• Released version 3.0b1.

8/24/04

• Made mpoption() throw an error if passed an invalid option name.

8/23/04

• Added an fmincon based OPF solver for the generalized formulation previously used by mopf (Carlos).
• Restructured opf.m so all OPF solvers have a similar API based on the one from mopf.m (Carlos).
• Added some quick tests for runpf and runopf for each algorithm.

8/13/04

• Renamed area variable to areas to avoid masking the built-in function of the same name.
• Made OPF data matrices areas and gencost optional for running simple power flow.

7/15/04

• The loadcase function (and therefore all of the run* functions now optionally accept a struct with the data matrices as fields in place of the case file name.
• Added t subdirectory with various tests and testing tools.

7/8/04

• Updated mp_lp.m and mp_qp.m to try linprog() and quadprog() after trying bp, since lp() and qp() are no longer included in the Optimization Toolbox as of version 3.

7/7/04

• Removed case.m, added caseformat.m, made case9.m the default case and fixed function names in other case files to avoid use of reserved word case.
• Fixed bugs in runcomp.m.

6/23/04

• Fixed bug in newtonpf.m which caused algorithm to diverge when the Newton step resulted in a negative voltage magnitude.

4/17/03

• Changed uopf.m to use a dynamic programming approach. More computationally expensive, but should find significantly better results when there are many gens to shut down.
• Added mp_lp.m and mp_qp.m, equivalents to lp.m and qp.m, respectively that call BPMPD if available. Modified LPrelax.m, LPsetup.m and dcopf.m to call these new functions.

4/14/03

• Fixed a bug in pfsoln.m which for cases with a single generator.

10/23/02

• Fixed bus numbering bug in System Summary section of printpf.m.

6/20/00

• Fixed a bug in printpf.m in the generator section, where the generator was assumed to be off if it's real power output was zero, even if the reactive output was non-zero.
• Modified printpf.m to print out lambdas in generation section for generators that are shut down.

6/8/00

• Modified cdf2matp.m so that Pd also includes any generation at buses specified as PQ buses. Also modified identification of generator buses to include only PV or reference buses. Thanks to Venkat.
• Modified cdf2matp.m so that it always treats the input values for Gs and Bs as per unit values and converts them to actual values expected by MATPOWER. Thanks to D. Devaraj.

11/9/99 - version 2.5b3

9/22/99

• Modified grad_*.m to return sparse matrices, unless using constr.m or an LP/QP solver that doesn't handle sparse matrices. Cleaned up sparse<->full conversions in LPconstr.m, LPrelax.m, and LPsetup.m.

9/21/99

• Undid a "bug fix" from 3/6/98 in makeYbus.m which zeros out charging capacitance for transformers. Apparently some transformer models actually have a non-zero charging parameter when using the model used by MATPOWER (ideal transformer in series with a PI model).
• Added loadcase.m which loads a MATPOWER case from an M-file or from a MAT-file. Changed all of the run*.m files to use this as the default way to load case files.
• Renamed print2mp.m to savecase.m and added the ability to save a case as a MAT-file as well as an M-file.

9/15/99

• Fixed opf.m so that it correctly uses the termination tolerances in the MATPOWER options vector for constr.m.
• In previous versions, Pmin/Pmax constraints are relaxed by 10 * OPF_VIOLATION in opf.m to avoid falsely reporting a binding Pmin/Pmax constraint in a case where a piece-wise linear cost function has a corner point exactly at the limit. This code was moved out of opf.m (and the standard MATPOWER distribution) to smartmkt.m and the value was changed to 100 * OPF_VIOLATION.
• Modified opf.m so the MINOS-based solver uses OPF_VIOLATION to set the value of MNS_FEASTOL and MNS_ROWTOL if they are set to zero.

9/9/99

• Included MINOS-based OPF with all of its options as algorithm 500. (involved including area in calls to opf.m and uopf.m)
• Removed some unused lines from fun_ccv.m and grad_ccv.m.

8/5/99

• Fixed a bug in the pfsoln.m in the distribution of Q among generators at the same bus. Initially attempted to distribute Q to generators proportional to each generators' Q "capacity". To do this correctly requires special cases for generators with QMIN equal to QMAX. For the sake of simplicity, we now distribute Q equally among all generators at the bus. Note: As before, the simple power flow does NO feasibility checking.

7/19/99

• Modified runuopf.m and uopf.m to handle DC OPF. Added the function runduopf.m which calls runuopf.m with the PF_DC flag set to 1.
• Fixed size of 2nd order (all zero) coefficient of objective for piecewise linear cost case in dcopf.m.

7/16/99

• Added the flag QP_SPARSE to mpoption.m to indicate whether the QP solver being used can accept sparse matrices. Also modified dcopf.m to use this flag.
• Fixed handling of VERBOSE option in dcopf.m
• Added the flag PF_DC to mpoption.m to indicate whether the power flow formulation to be used for power flow and optimal power flow is a DC approximation or full AC representation. Merged rundcpf.m with runpf.m and rundcopf.m with runopf.m so that the appropriate solver will be used based on the value of the PF_DC flag in the options. The functions rundcpf.m and rundcopf.m were modified to simply call runpf.m and runopf.m, respectively, with the PF_DC flag set to 1.

7/15/99

• Changed the sign of the phase shifters in printpf.m to be consistent with the bug fix to makeYbus.m made on 3/6/98.

7/14/99

• Included four new m-files (makeBdc.m, dcopf.m, rundcpf.m, and rundcopf.m) which implement a DC power flow and DC optimal power flow algorithms.

7/13/99

• Cleaned up variable names in makeYbus.m to avoid confusion.

6/10/99

• Changed UOFP to UOPF in print statements uopf.m.

6/3/99

• Modified print2mp.m overwrite instead of append to an existing file.
• Fixed bug in cdf2matp.m to make it always correctly write a text file output.

6/2/99 - version 2.5b2

• Modified print2mp.m to include line flows and Lagrange and Kuhn-Tucker multipliers in output if available.

4/29/99

• Included a Gauss-Seidel power flow solver gausspf.m, and made corresponding changes to runpf.m and mpoption.m. Code contributed by Alberto Borghetti.

4/28/99

• Modified newtonpf.m to handle cases with no PQ buses or no PV buses under newer versions of MATLAB.

2/25/99

• Fixed a bug in uopf.m which occurs when two (or more) generators have positive decommitment indices but shutting them down one at a time always results in increased system cost. In this scenario, it would go into an infinite loop of attempting to shut them down one by one.

2/24/99

• Modified uopf.m to be able to handle the case where the sum of the Pmin's is greater than the load. It shuts down generators in order of decreasing average cost at Pmin (breaking ties randomly) until this infeasibility is gone.

2/16/99

• Fixed bug in pfsoln.m which caused crashes in MATLAB 5 for systems with no capacitors.
• Added print2mp.m, which can print out a MATPOWER case file from the data matrices.
• Added to run*pf.m ability to save solved case.

2/10/99

• Modified ext2int.m to allow for area matrix to be empty.

12/3/98

• Changed pfsoln.m so that there is only one slack generator. Instead of dividing the P between multiple gens at the slack bus in proportion to capacity (this caused problems for the LPconstr versions of the OPF), it now treats the first generator at the slack bus as the only slack generator, leaving the dispatch of the other gens at the bus unchanged.
• Added generator number to generation constraint printout and branch number to branch data and branch flow limit printouts.

12/2/98

• Changed printpf.m to print elapsed time and objective fcn value even when OUT_SYS_SUM is turned off.
• Added code to LPconstr.m to explicitly zero out lambdas for non-binding constraints.

12/1/98

• Made modifications to the following to allow for multiple generators at each bus. For simple power flow, the Q dispatch is divided between multiple gens at a bus in proportion to each gen's Q capacity. Likewise with P for multiple gens at the slack bus.
  • bustypes.m
  • fun_ccv.m
  • fun_std.m
  • grad_ccv.m
  • grad_std.m
  • LPeqslvr.m
  • makeSbus.m
  • opf.m
  • opfsoln.m
  • pfsoln.m
  • printpf.m
  • runpf.m

10/29/98

• Fixed bug in uopf.m which caused it to crash when attempting to restart a generator after more than 2 had been shut down.

10/19/98

• Generalized definition of GEN_STATUS column of gen matrix to allow for distinctions in the status of out-of-service generators. The default values of 0 => out-of-service and 1 => in-service still work, but the logic has been changed so that GEN_STATUS > 0 is now in-service and GEN_STATUS <= 0 is now out-of-service, as opposed to GEN_STATUS ~= 0 and GEN_STATUS == 0, respectively, which was used previously. This allows for a GEN_STATUS of -1, for example, to indicate a generator which is off-line but could be brought on in case of an emergency.

9/2/98

• Fixed bug in printpf.m which caused area exports to be off slightly.

9/1/98

• Fixed bug in printpf.m. Total intertie flow was double the correct value.

8/31/98

• Fixed bug which included line flow limits for out-of-service lines in OPF.
• Modified pfsoln.m, opfsoln.m, printpf.m to zero out flow on lines which are out-of-service. Found by Ramazan Caglar.

7/28/98

• Changed VAR and MVAR to VAr and MVAr everywhere in output.

3/13/98

• Decreased the default value of LPC_TOL_X option to increase solution quality.
• Modified fix of 2/10/98 to use a value based on the value of the OPF_VIOLATION option.

3/6/98

• Fixed 2 bugs in makeYbus.m. Phase shifters now shift the phase the right direction, the line charging susceptance parameter is now correctly ignored for transformer and phase shifters.

3/3/98

• Fixed a bug fun_std.m which caused it to always compute 2nd order derivatives. Now it only computes them when requested.

2/10/98

• In previous versions, Pmin/Pmax constraints are relaxed by 1.0e-6 in opf.m to avoid falsely reporting a binding Pmin/Pmax constraint in a case where a piece-wise linear cost function has a corner point exactly at the limit. Changed the amount of relaxation to 1.0e-4 since the problem still occurred at times.

1/29/98

• Changed the value of LPC_MAX_IT from 1000 to 400 to allow for earlier detection of infeasible OPF.

Version 2.0 - Dec 24, 1997

12/24/97

• Released version 2.0.

12/19/97

• Fixed ambiguity in case file data and comments regarding lines vs. transformers. Now a tap ratio of zero means that it's a line and a non-zero tap ratio means that it's a transformer.
• Optimized formation of Ybus (and hence B matrices).

12/18/97

• Implemented fast decoupled load flow.

12/17/97

• Optimized formation of Jacobian matrix in newtonpf.m (significant improvement for large systems under MATLAB 5).

12/16/97

• Fixed another bug in calculation of losses. Previous versions did not take into account off-nominal taps for transformers.
• Fixed a bug in calculation of losses. Previous versions included line charging injection in reactive line losses.
• Added ability to optionally return solution data from run*.m functions.
• Added ability to optionally print results to a file.
• Added system and area summaries to printpf and modified to handle the new printing options.

12/12/97

• Consolidated printing into printpf.m, eliminated printopf.m.
• Removed QCCV method (standard formulation solves same problem, but more efficiently).
• Removed OPF algorithms which use fixed generator voltages (this can still be done by changing voltage limits in the case file), renumbered OPF algorithms, removed CCV.m and varVg.m.

12/11/97

• Added 2 more levels of control of verbose output.
• Put all MATPOWER options into an options vector defined in mpoption.m.

12/10/97

• Incorporated new LP-based OPF routines and updated alg codes.
• Fixed a bug in the documentation in the case files regarding the 4th column of gencost. For piece-wise linear cost functions this value is the number of data points, not the number of parameters (x and y for each point).
• Removed some m-files that are not used (usesOT.m, usesLP.m).
• Renamed some m-files (OTfungra.m to fg_names.m, OTSfun.m to fun_std.m, OTgra.m to grad_std.m, OTCCVfun.m to fun_ccv.m, OTCCVgra.m to grad_ccv.m).

12/8/97

• Rewrote uopf.m to use a smarter decommitment strategy (see the docs for the details of the new method). Removed ref, pv, pq from the list of parameters passed in, since they were not used.

11/19/97

• Fixed a bug in previous versions of uopf.m which returned incorrect values for Pmin.

10/28/97

• Increased maximum number of iterations for constr-based OPF.

10/24/97

• Fixed a bug in previous versions which may result in incorrectly reporting Pmin or Pmax limits to be binding, possibly with large multipliers, if the piece-wise linear cost function has a corner point exactly at Pmin or Pmax.

10/22/97

• Added to OTSgra.m (renamed to grad_std.m in 2.0) the ability to return the second derivatives of the objective function.

9/24/97

• Fixed a bug in previous versions of runuopf.m which prevented it from printing out the raw data needed for our Perl DB interface.

9/23/97

• Fixed a bug in 1.1b1 in OTCCVgra.m (renamed to grad_ccv.m in 2.0) which caused printing of warning message "Concatenation involves an incommensurate empty array" under MATLAB 5.

9/22/97

• Fixed a bug in 1.1b1 which prevented runuopf.m from running at all. Wrong number of parameters to call opf.m.

9/20/97

• Released version 1.1b1.

9/19/97

• Modified the formulation of the OT-based OPF. The objective function may now include costs for reactive power as well as active power. In previous versions the reactive power variables and reactive power balance equations for generator buses were not included explicitly in the optimization as variables and equality constraints. Generator reactive powers were computed directly. Now they are included explicitly in the optimization. Costs for Qg are specified in extra rows in gencost.

Version 1.0.1 - Sep 20, 1997

9/20/97

• Released version 1.0.1.

9/19/97

• Fixed a bug in 1.0 OTSgra.m and OTCCVgra.m (renamed to grad_std.m and grad_ccv.m, respectively, in 2.0) which used incorrect coefficients to compute cost if specified as polynomials of different degrees.

9/18/97

• Fixed a bug in 1.0 in OTopf.m which caused the last equality constraint (Q mismatch for last PQ bus) to be treated as an inequality constraint. It appears that this constraint was normally binding (unless Qd was negative) in which case the solution was still correct.
• Fixed a bug in 1.0 in runpf.m, initial voltage for generators which were shut down were taken from gen(:, VG) rather than bus(:, VM).
• Fixed a bug in 1.0 in varVg.m which caused Kuhn-Tucker multipliers to print out in the wrong place for LP-based OPF.

Version 1.0 – Sep 17, 1997

9/17/97

• Released version 1.0 (first widely publicized release).
• added placeholders for LP-solvers that we can't re-distribute
• updated documentation

9/12/97

• added ability to do pretty & ugly printing at the same time also documented that ugly printing is for talking to our our Perl database interface code
• included Deqiang (David) Gan's LP IEEE -> matpower data conversion code
• included Deqiang (David) Gan's LP based OPF code
• fixed LAM_Q bug, now computes correctly for generator buses
• fixed some bugs in totcost.m

9/9/97

• removed PRICE from idx_gen

9/4/97

• added code to convert from (possibly non-consecutive) external bus numbering to consecutive internal bus numbering before solving, and back to external before printing results
• replaced test*pf with run*pf which are now functions taking the casefile name as a parameter (among other params)
• made changes necessary to handle new format of case file (generator costs moved to gencost variable)

First Public Release – Jun 25, 1997

6/25/97

• made first public release (not widely publicized)
• documentation updates
• changed names of m-files to fit DOS 8.3 limitation
  • buildsbus.m => makeSbus.m
  • buildybus.m => makeYbus.m
  • idx_branch.m => idx_brch.m
  • dSbranch_dV.m => dSbr_dV.m
  • dAbranch_dV.m => dAbr_dV.m
  • ucopfsoln.m => uopfsoln.m
  • testucopf.m => testuopf.m
  • ucopf.m => uopf.m (for naming consistency)
• changed copyright notice

6/18/97

• modified ucopf.m to allow a generator to be turned back on if shutting it off results in an infeasible (or at least non-convergent) OPF, also changed the order of shutting down generators which are dispatched at zero, now chooses one with largest mu_Pmin

6/12/97

• fixed bug in printpf.m so it doesn't print PG & QG for gens that have been shut down
• fixed bug in pfsoln.m to correctly compute the reference bus power injection when generators have been shut down

6/10/97

• fixed Vg initialization bug in testpf.m (not just testopf, etc)

6/9/97

• fixed bug in PLCCV versions which set the initial values of the cost variables wrong (used p.u. Pg instead of actual)
• made opfsoln.m copy generator voltages back to gen(:, VG)
• fixed bug in code which initializes generator voltages, it was always setting the angle to zero, now it uses the value from the case file

6/3/97

• included OPF variations which use cost variables constrained by a piece-wise linear cost function (PLCCV = piece-wise linearly constrained cost variables)

6/2/97

• included OPF variations which use cost variables constrained by a quadratic cost function (QCCV = quadratically constrained cost variables)
• included OPF variation which allows generator voltage magnitudes to vary
• fixed line in test*pf.m scripts which initializes V0 (I'd missed the sqrt(-1) before

4/16/97

• changed line 59 of ucopf.m from return to break to ensure return values are correct

4/14/97

• added some print statements to ucopf.m

4/12/97

• reduced max iterations to 100 for constr in opf.m

4/8/97

• modified opf.m, ucopf.m, testopf.m, testucopf.m to include success, a variable which indicates whether OPF was solved successfully or not

4/7/97

• fixed bug in ucopf.m, assumed all generators are initially available

---