Software Patches

December 8, 2020

Features and Improvements

  • Auxiliary Files (SCRIPT and DATA Sections): The TapTransmissionLine script command has a new parameter added to the end of the command called ReplaceObjects. Default is NO. When set to YES the original line object will be replaced with the tapped line objects on all open oneline diagrams.
  • Auxiliary Files (SCRIPT and DATA Sections): A script command has been added to allow clearing a single fault that has been calculated with the fault script command. The new command is simply "ClearFault", with no parameters needed.
  • User Interface Dialogs: Added an option to the Auto Tap Transmission Line dialog to allow the user to choose to replace the original line object with the tapped line objects on all open oneline diagrams. If this dialog is opened by right clicking on a line object in a oneline, the line object that is clicked will always be replaced with tapped line segment objects regardless of how the option is set in the dialog.
  • Bug Fixes

    • Oneline Diagrams: Fixed bug with saving onelines in jpg or gif formats in which only part of the display would be saved.
    • Optimal Power Flow (OPF): Modified the piece-wise linear cost function so that it will always show extra decimals places in order to show at least 6 significant digits. Previously it always showed 2 decimal places, so that a cost of 0.765432 would appear as 0.77. Now will add decimal places to get to 6 significant digits.
    • Sensitivity Calculations: Fixed bug that indicated that elements were in different islands when calculating TLRs on interfaces that included other interfaces even when all elements were in the same island.
    • Transient Stability: Modified the WTGWGO_A model so that when the voltage drops below Vwgo it automatically restarts the playback of the Pref signal regardless of whether a voltage drop and Pref recovery playback had already begun.
    • Transient Stability: Transient Plot definitions which showed results for transformer fields where not being read back in from an AUX file correctly. This has been fixed.
    • Transient Stability: In the governor model UHRSG, the Pref input parameter is like a limit on the Pmech output. If "Modify Limits and Run" is selected in Transient Stability Options, then the Pref value is set the same as Pmech, and valve position is set to 1.0.
    • Transient Stability: For excitation limiter OEL4C, Transition Events are now added to the Events log in Transient Stability to show when the model is injecting a non-zero signal into the summation joint of the related Exciter Model. This is useful for extended-duration simulations.