Software Patches

May 2, 2013

Features and Improvements

  • Contingency Analysis Tool: Added a field with a contingency to report the total amount of generation drop that occurred during the contingency. This includes generation the is online in the reference state and become offline after the contingency for any reason. Reasons include islanded gen, gen opened from a gen or injection group action, and gen dropped from injection group merit order open action.
  • Contingency Analysis Tool: Created a new option for "Compare Contingency Definitions". This option will compare the presently defined contingency list against an AUX file (which contains another set of contingency definitions). The output will be a CSV file that lists contingencies that match one another. Note that this comparison only compares the actions in each contingency definitions. It does not compare the model criteria or actions status, thus it may report two contingencies as the "same" even though the conditional checks make them function slightly differently.
  • File Formats: When reading switched shunt records from a RAW file, a mode of 3 will now be interpreted as controlling the Mvar output of generation. Mode 4 and 5 to not correlate to features in Simulator, so these are treated as shunts with a constant Mvar.
  • Transient Stability: Increased a numerical tolerance for SVSMO1 and SVSMO3 to prevent a small numerical oscillation.
  • Bug Fixes

    • Contingency Analysis: Fixed how the nominal kV associated with a contingency violation is shown in the case information displays.
    • Transient Stability: Some line relay events where not identifying the associated line in the Events table. This has been fixed.
    • Transient Stability: Added initial limit violation check on Ilr for the TEXS exciter.
    • Transient Stability: Fixed incorrect reporting of the generator stabilizer output. The numerical simulation was using the correct stabilizer value, so the simulation was correct, but the output result reporting was showing the wrong values sometimes.
    • Transient Stability: Fixed TEXS exciter bug related to ignore the limit on the inputs of the PID controller (+/-Vimax)
    • Transient Stability: Fixed error in calculation of the "Zone Reach %" values for various line relays models which have a far bus specified.
    • User Interface Dialogs: On the switched shunt dialogs, when trying to set the regulation type to Generator Mvar, the dialog would instead set it to Custom Control. This has been fixed.