Software Patches

October 16, 2019

Features and Improvements

  • Transient Stability: Modified the LD1PAC (and thus LD1PAC_CMP which derives from this model and also CMPLDW, CMLD, and CMLWDWNF that contain this model). When the Tstall parameter is set to a negative number, then a hard-coded inverse time characteristic is implemented which replaces the definite time Vstall/Tstall characteristic. The curve implemented uses the following table to lookup a Tstall from the terminal voltage of the model (with a linear interpolation between points). Also the inverse time internal state is automatically reset whenever the terminal voltage goes above 0.565 per unit.
    Vterm Tstall (in cycles)
    0.000 2
    0.450 2
    0.490 3
    0.550 12
    0.565 15
  • Bug Fixes

    • File Formats: When loading PTI RAW files for Branches, LineShunts that were 0 MW and 0 MVar were being created. This did not impact the simulation but was strange, so has been fixed.
    • Transient Stability: Fixed the Branch Event of changing the R and X. The label spin and the edit box wasn't working from the dialog.