Software Patches

March 4, 2021

Features and Improvements

  • Available Transfer Capability (ATC) Tool: Added concise variable names for ATC related objects: TransferLimiter, ATCScenario, ATCExtraMonitor, ATCFlowValue, ATCGeneratorChange, ATCLineChange, ATCLineChangeB, ATCInterfaceChange, ATCZoneChange. Also added these to Version 21 so they can READ files written with new names in Version 22. However, Version 21 will NEVER write these new variable names.
  • Transient Stability: (a) All Exciter Models and Excitation Limiter (OEL/UEL/SCL) Models now have compatibility checks (errors) during Validation before
    running Transient Stability, along with Auto-Correction that will disable the ill-configured OEL/UEL/SCL instances.
    (b) The Compatibility information can also be viewed in a table by viewing Exciter fields - "OEL Input Used", "UEL Input Used" and
    "SCL Input Used", and OEL/UEL/SCL fields - "Output Used".
    (c) If a OEL/UEL/SCL output signal feeds into a Summation Point of the Active Exciter, the min/max parameters of the OEL/UEL/SCL are validated, along with Auto-Correction to ensure an output signal of zero when operating within the bounds of the OEL/UEL/SCL.
  • Bug Fixes

    • Available Transfer Capability (ATC) Tool: When using iterated ATC methods and the full transfer step will not solve, the stepsize is reduced by half in an attempt to get a solution. Prior to attempting the full stepsize, reserve limits on the source and sink are checked if MW limits are being enforced and the stepsize is reduced if source or sink limits would be exceeded. Now this reserve limit check is also done on the reduced stepsizes when the full transfer step will not solve.
    • Available Transfer Capability (ATC) Tool: When loading TransferLimiter objects from an AUX file for multiple scenario results using the concise auxiliary file format, the transfer limiters would be loaded correctly, but the ATCScenario was not being properly flagged as having "finished" its calculation so the results would not appear in the summary user interface on the ATC dialog. This has been fixed.
    • Available Transfer Capability (ATC) Tool: When using iterated ATC methods, AGCable generators that are in areas on control that are not the seller or buyer might still move because of changes in losses due to area to area transfers. These generators will now be adjusted relative to the starting dispatch at the beginning of the process.
    • Transient Stability: To match the behavior of Exciter model WT3E in PSLF, modified to make only acceptable values for the parameter "vltflag" of 0 or 1. WT3E1 has another option.
    • Transient Stability: Bug fix for Autosaving plots while running Distributed Transient Stability.