Software Patches

October 29, 2019

Features and Improvements

  • Transient Stability: Added a button on the Transient Limit Monitors tab of the transient stability dialog to "Re-evaluate to Get Limit Monitor Violations." This will re-evaluate stored results to determine limit monitor violations. First the results in RAM will be searched, and if not found, results in TSR files will be searched. If in Multiple Contingencies mode, all contingency results will be evaluated.
  • Transient Stability: Added support for a new relay model named LDS4 which is identical to LDS3 except that it includes two extra parameters Vthresh and Tv. When the voltage at the measured bus of the relay drops below Vthresh, then the relay will not respond until the voltage goes back above Vthresh for at least Tv seconds. While the relay is inhibited from acting this way it will also reset any stages of the relay that may have started their timer. Note however that if a stage had already made a decision to trip something then dropping below Vthresh will not stop this from happening.
  • Bug Fixes

    • Auxiliary Files (SCRIPT and DATA Sections): Updated the script command TSLoadPTI() so that a 5th option parameter for MOD_REMOVE filename is now available.
    • Auxiliary Files (SCRIPT and DATA Sections): Fixed error in parsing fields from AUX files which had consecutive single quote characters embedded inside the string.
    • Auxiliary Files (SCRIPT and DATA Sections): Fixed how TSPlotSeries read from an AUX file are when the plot series referred to fields of a Measurement Model such as LDTRPMON.
    • Available Transfer Capability (ATC) Tool: When allowing users to specify the names of multiple ATC scenarios, prepend an underscore on the name if it matches a default name and the name is not in the appropriate order. The default names of generator scenarios are G0, G1, G2, etc. If a user decides that the names should be G1, G2, G3, etc., the resulting names will be _G1, _G2, _G3, etc.
    • Transient Stability: In the measurement object LDTRPMON which monitors the composite load model, the reported Other field values of Pld, xshn, and Pdg were being shown in per unit instead of in MW (off by a factor of the system MVABase and thus by default 100 times too small). As a result values for these 3 fields would show 2.5 instead of 250. This has been fixed. Also, the field name "xton" was showing up as "ston" which was a typo that has been fixed now too.
    • Transient Stability: Bug fix for WTTQA1, which was initializing Pref0 on the wrong base, and hence causing the initialized PI Input value to be non-zero.
    • Transient Stability: Added validation of the Ta parameter on the ESST1A exciter model to ensure it is not too small.
    • Transient Stability: Only generators with synchronous machine models can have a meaningful non-zero value for the power angle.
    • Transient Stability: Fixed bug reading zonedef for distrel when reading from a dyd file.