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CHANGELOG.rst

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Changelog

2.1.4 (2024-03-29)

  • Added a setting to enable and disable momentary cessation (MC_ENABLE)
  • Added settings to configure the momentary cessation voltage threshold (MC_LVRT_V1, MC_HVRT_V1)
  • Fixed a bug on momentary cessation not triggering on high voltage condition.
  • If NP_PHASE is set to 1 or 3, it will be automatically converted to 'SINGLE' or 'THREE'

2.1.3 (2023-12-05)

  • Added a property for SoC of BESS DER using .bess_soc
  • Automatically update the reactive capability curve if nameplate parameter is modified (when user defined curve is not provided)

2.1.2 (2023-08-23)

  • Fixed an issue for BESS parameter initialization

2.1.1 (2023-08-18)

  • Fixed an issue on voltage source output when zero sequence voltage is present
  • Corrected single phase DER voltage measurement

2.1.0 (2023-05-29)

  • Updated interaction between enter service ramp and ride-through. Now DER returns to enter service ramp after ride-through
  • Added an optional charge/discharge ramp rate limit for BESS DER
  • Added resets for all grid-support functions when DER is tripped

2.0.3 (2023-04-14)

  • Fixed the option to update BESS DER parameter when creating the object.
  • Fixed a bug when initializing a BESS DER during abnormal frequency condition.

2.0.2 (2023-04-03)

  • Fixed a bug abnormal operation category (NP_ABNORMAL_OP_CAT) only accepts uppercase values
  • Updated ride-through performance to better represent actual inverter's behavior
  • Added an option to update DER parameter when creating the object.

2.0.1 (2023-03-21)

  • Fixed a bug where enter service randomized enter delay does not behave as expected
  • Fixed a bug where momentary cessation does not behave as expected

2.0.0 (2023-03-20)

  • Changed all units of nameplate rating to the base unit Watt/var/VA, from kW/kvar/kVA in Version 1.0.
  • Added one time delay feature to represent the DER active and reactive grid support functions’ reaction time, and a first order lag for in applicable voltage measurement.
  • Added Battery Energy Storage System (BESS) DER specific functions including State-of-Charge (SOC) calculation, and their corresponding model input parameters.
  • Updated applicable smart inverter functions to consider BESS DER behaviors, including volt-watt, active power limit, and watt-var functions.
  • Changed the DER operation status from ON/OFF to “Continuous Operation”, “Mandatory Operation”, “Momentary Cessation”, “Trip”, etc., to better capture the DER ride-through status, and its performance in different ride-through modes.
  • Added DER ride-through performance module, which includes the DER performance under different ride-through modes, including Momentary Cessation, etc.
  • Added DER model output options as current source and voltage source behind impedance.

1.0.2 (2022-07-18)

  • Improve model input validity check process

1.0.1 (2022-06-17)

  • Include parameter csv files into the PyPI release

1.0.0 (2022-05-17)

  • First release
  • Model for photovoltaic (PV) DERs, including all smart inverter functions defined in IEEE Standard 1547-2018, as well as trip and enter service behaviors
  • Output active and reactive power (P, Q) for power flow analysis
  • Suitable for both steady-state, quasi-static time series (QSTS) and dynamic simulations