Software Patches

July 1, 2013

Features and Improvements

  • Contingency Analysis Tool: The contingency analysis Miscellanous option that specifies how to identify objects as a string in the results for "What Actually Occurred" could not be stored to an AUX file or set using a script command. This option is now available under the variablename WhatActuallyOccuredContingencyDescription:1 for the objectname CTG_Options.
  • Oneline Diagrams: Modified some size thresholds at which labels appear when exporting to the KML file.
  • Oneline Diagrams: Now when pressing Insert Connected Buses | Then Auto Insert Lines from a bus in a oneline the dialog will have an option to "Do this for all future edits". This will disable the dialog and will automatically do what you selected to automatically Re-size the Bus Size by Stub-size or interconnected lines to the bus every time you do Insert Connected Buses | Then Auto Insert Lines without asking again in the dialog.
  • Transient Stability: Added some error messaging when using TSGetResults script command with invalid syntax in the field specification. Previously if there was a syntax error Simulator would ignore the entire command but didn't indicate this to the user in an error message.
  • Transient Stability: Modified Type 3 and Type 4 wind turbine models to include hard-coded low voltage REACTIVE current management for per unit voltages below 0.3 per unit AC voltage. Starting at 0.3 per unit voltage, the reactive current will be reduced linearly from what the dynamic models specifies at down to zero at 0.1 per unit voltage. This is needed to allow extreme event modeling such as faulting at the terminal of a wind turbine or at a point that feeds wind turbines radially. A similar feature is part of the wind turbine models for ACTIVE current and starts at 0.8 per unit going to zero at 0.4 per unit typically.
  • User Interface Dialogs: Length edit box is disabled when viewing a transformer to prevent confusion because this means nothing for a transformer.
  • Bug Fixes

    • Case Information Displays: Corrected the specification of switched shunt mvar blocks when typing in a case information display. It wouldn't allow you to remove a block by entering 0 or blank.
    • Contingency Analysis: When using linearize DC approximations or the dc approximation power flow for contingency analysis, we do not store custom monitor violations. Previously we were storing them but they were always evaluated in the reference state which didn't make sense.
    • GIC: Modified GIC calculation to not treat transformers with delta windings as autotransformers regardless of the user input.
    • Oneline Diagrams: Now you can set the StubSpace even when the stubSize is zero. Before a dialog pop-up and didn't allow for a changed. This didn't make sense.
    • Oneline Diagrams: There was a bug when pressing Insert Connected Buses | Then Auto Insert Lines in the sense that if you added a bus and the interconnected buses were already in the oneline, simulator wasn't drawing the interconnected lines. Now it will draw the interconnected lines.
    • Power Flow Solution: An solution error would occur when using Difference Flows to view either the Difference or Base case, due to a bug in the calculation of SVC type switched shunts. This has been fixed.
    • Transient Stability: Fixed an error that would occur when editing a field of Sub Plot definition in the case information displays.