Software Patches

August 21, 2020

Features and Improvements

  • Contingency Analysis Tool: Added branch field called Status Change Order. This field can be used during contingency analysis with conditional actions to check the order in which branches changed status. The order is dependent on the contingency element Status group (CHECK, TOPOLOGYCHECK, POSTCHECK, etc.) in which the action is applied. This value is 0 by default, which indicates that a branch did not change status during a contingency. Branches that change status during the same group will have the same order value. Once a contingency has finished processing this field will be reset to the default of 0 for all branches.
  • Transient Stability: Modified the electrical control models for renewable plants named REEC_A, REEC_B, REEC_C, and REEC_D models so that they obey the Transient Governor Response flag that indicates either Down Only or Fixed.
  • Transient Stability: Modified the plant controller model REPC_A model to obey the Governor Response Flag that indicates either Down Only or Fixed.
  • Transient Stability: Added Vemin to Exciter AC1C, AC6C, AC10C and AC11C. Also added VFEmax to AC1C.
  • Bug Fixes

    • Case Information Displays: Entering a blank owner number should have been interpreted as removing that part of ownership, but Simulator was instead just ignoring the input of blank and leaving the existing ownership alone. This has been fixed.
    • Transient Stability: Modified REGC_A, REGC_B, and REGC_C so that Iqrmin and Iqrmax are both ignored if the initial Mvar output of the generator is less than 1% of the MVA rating of the machine.
    • Transient Stability: Corrected ABBSVC1 model's initialization of state T1 and derivative of state T8.
    • Transient Stability: Fixed error with loading the h6e model from a DYD file. It was incorrectly treating it as an unsupported model in PSLF and skipping the model.
    • Transient Stability: Fixed divide by zero error in initializing the DC line dynamic models CDCMC and CHVDC2 if the DC line was out of service in the power flow case.
    • Transient Stability: Fixed a bug with LHVRT relay model that was producing multiple messages when the relay was activated.