Software Patches

February 5, 2021

Features and Improvements

  • Bus View and Substation View Onelines: The Bus View option to "Show Only Breaker for Consolidate Branch" will only be checked by default if opening an EMS case. This will no longer be checked by default if simply opening a case that contains breakers.
  • Power Flow Solution: Added ability to specify as input the RegBus with a VoltageDroopControl object. If the value is specified, then all generators assigned to that VoltageDroopControl will automatically use this regulated bus. If the value is unspecified, Simulator will continue to create a unique Voltage Drop Control equation for each set of generators within the voltage droop control which share a regulated bus (or buses connected by low impedance branches).
  • Transient Stability: Adding Saving GE Stability Data with Options. The Options are Only Records Modified in Difference Case, a Bus Filter and Sort Gens, Loads and Switched Shunts by Bus; Area, then Bus; Zone, then Bus; Area, then Zone, then Bus; or Zone, then Area, then Bus.
  • Bug Fixes

    • Available Transfer Capability (ATC) Tool: If running ATC Multiple Scenarios through script commands it was possible that the options for Transfer Limiters to Save, Max Limiters per CTG, Max Limiters per Element, and Max MW Limitation used defaults instead of user-specified values. This has been fixed.
    • File Formats: When reading the WECC transient fault definition file (*.swt), the FL record for faulting a line was reading the fault location as though it was in percentage. The FL record however lists the location as a decimal between 0.0 and 1.0, so we needed to multiply by 100.
    • Transient Stability: Several fixes to Governor Model UCBGT for more robust initialization, and to conform to the specifications as per CIGRE Technical Brochure on MODELING OF GAS TURBINES AND STEAM TURBINES IN COMBINED CYCLE POWER PLANTS (2003)
    • Transient Stability: Bug fix for Governor Model UCBGT and DER_A models. PI/PID controllers had the Kp and Ki values swapped.