Software Patches

August 9, 2021

Features and Improvements

  • Auxiliary Files (SCRIPT and DATA Sections): Added a new script command named RotateBusAngleInIsland. The first parameter is the identifying information for a bus between square brackets and the second parameter is a numeric value for a new angle. The script command will rotate all the angles in the island to which the bus belongs by the same shift such that the specified bus ends up with a bus angle specified by the second parameter.
    RotateBusAnglesInIsland([BUS num], Value);
  • Case Information Displays: Added a right-click option on a case information display of buses to "Rotate Bus Angles in Island". You then choose what angle you would like at the bus you have chosen and then all angles in the island to which this bus belongs are rotated by the same angle to achieve the desired angle at the chosen bus.
  • Case Information Displays: Added fields to branches in Neighbors\Parallel Branches with Flipped Terminals to indicate if there are parallel branches with flipped terminals. This could indicate a modeling error, particularly for transformers.
  • Transient Stability: In VHVDC1 the Pacref is treated as equal to 0.0 when either converter is blocked. This modification also changes it so that Idcref is also treated as 0.0 when either converter is blocked. This only mattered when using the dPmax and dPmin values to enforce a rate limit on the change in Pacref.
  • Transient Stability: Added the signals 'Iact', 'Ibias', 'Terr', 'IERRinv1' and 'IERRinv2' for the OEL2C model Other Fields.
  • User Interface Dialogs: Added button to the Edit Mode Branch dialog to allow the easy flipping of the from and to buses.
  • Bug Fixes

    • File Formats: Fixed an access violation that could occur when during saving/loading primary contingency records.
    • File Formats: Fixed access violation that would occur when loading an EPC file which contained no Shunt record section.
    • Transient Stability: More robust initialization for OEL2C.
    • Transient Stability: When an OEL model was getting VFE from generators as an input it was not getting the VFE correctly.
    • User Interface Dialogs: Fixed bug when entering the branch Length on the Branch Options dialog while in edit mode. The edit box was being updated with a conversion to the selected miles or km unit while typing a new value making it impossible to enter the desired value.