DC Power Flow feature added #251
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+ identify.py: new mode 'dpf' (dc power flow) is added + transmission.py: add_transmission_dc function added this function includes both transport model and dc power flow model constraints, variables, sets + transmission.py: transmission_balance function edited + transmission.py: transmission_cost function edited + mimo-example.xlsx: added admittance column under transmission sheet + runme.py: edited temporarily for fast debugging
…r_flow # Conflicts: # urbs/features/transmission.py
Dc power flow1
…dc power flow model
unnecessary comment deleted from transmission tuple creation transmission output rule is defined for all of the transmissions, with the exception (planned) that the efficiency of dc transmission lines are 1
investment cost and fix cost parameters are multiplied with 2 for dc transmission lines in the input file. no case switch for investment and fix costs between dc and tp transmission lines.
…ission sheet added angle difference limit constraint to model with difflimit parameter, angle difference between source and destination sites can be limited.
Efficiency of dc transmission lines should be 1
… function Since absolute power flow value will not be minimized with C02 function as in cost, results may be wrong.
# Conflicts: # runme.py
changed dc power flow formulation backward compatibility bugs fixed
| @@ -516,6 +516,15 @@ def pyomo_model_prep(data, timesteps): | |||
| # dictionaries for additional features | |||
| if m.mode['tra']: | |||
| m.transmission_dict = transmission.to_dict() | |||
| # DCPF transmission lines are bidirectional and do not have symmetry | |||
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Why are DCPF bidirectional? How is that understandable for users?
And why is it then necessary to multiply by 2?
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The equation of DC power flow includes the voltage angle difference between source and destination sites. Depending on the values of voltage angles, the power flow can have a negative value, indicating the direction of the power flow. For this reason, a transmission line modelled with DC power flow is introduced as bidirectional.
The users can still give two separate transmission arcs for a transmission line as in the previous version but if the transmission line has reactances defined, one of the complementary arcs will be removed from the model remove_duplicate_transmission(). This way the users will not have to change any input method.
With the symmetry constraint for transmission lines, both of the transmission arcs of a transmission line must have the same total capacity installed. Which means, if a transmission capacity expansion takes place for an arc, it would cause an expansion in the complementary arc. Since the DCPF transmission lines do not have complementary arcs the fixed and investment costs would be halved. To prevent this error, fixed and investment prices for DCPF lines should be doubled before calculating the costs.
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With the symmetry constraint for transmission lines, both of the transmission arcs of a transmission line must have the same total capacity installed. Which means, if a transmission capacity expansion takes place for an arc, it would cause an expansion in the complementary arc. Since the DCPF transmission lines do not have complementary arcs the fixed and investment costs would be halved. To prevent this error, fixed and investment prices for DCPF lines should be doubled before calculating the costs.
Alternatively, one might halve the costs for the non-DC transmission lines, if the input inv-cost reflects the actual cost of the transmission line (and not the rather unintuitive "half-cost" as it is now). We should discuss this at one point.
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User documentation will be included soon, listing required input, output and general feature information. |
…not be assumed as duplicates in intertemporal mode
…ted -0 Bug fix: Report function failed if no power flow from other_sites existed
+validation functions for base voltage and angle limit parameters are added
DC Power Flow feature added to the current version.
Transmission lines can be modelled with DC Power Flow model optionally.
Corresponding columns are added to example input. If the columns are left empty as default DCPF feature will be ignored.
This version is compatible with the previous version's input files.
Input:
Output:
Phase Angle of Sites: Phase angle of sites, which were connected with DC Power Flow transmission lines, will be calculated.