Software Patches

June 15, 2012

Features and Improvements

  • Case Information Displays: When choosing to "Send to Excel" from a case information display, previously Simulator would always split exports of more than 256 columns into separate sheets in an Excel Workbook. For Excel versions 2007 and later, it will now only do this for more than 16,384 columns instead.
  • Contingency Analysis Tool: Added new option with Model Conditions to "Evaluate in Contingency Reference State". This option will only be used when implementing a contingency and will return the result of the model condition as it was in the reference state rather than evaluating at the present state.
  • Transient Stability: Added ability to right-click on a plot in the plot designed and choose Generate Plot.
  • Transient Stability: During initialization, added additional limit violation checks for the WT4E wind turbine electrical model.
  • Transient Stability: When loading in a DYD file, Simulator will no longer prompt the user asking about whether to split generators as prescribed by a GENCC model. This will now always be done with appropriate info messages written to the log.
  • Transient Stability: Modified the layout of the transient stability dialog to give more direct access to the Transient Limit Monitor violations and also to combined lists all transient contingency elements and violations
  • Bug Fixes

    • Case Information Displays: Added ability to save the case information customizations for the OPFZones table.
    • File Formats: When reading an EPC file, if an Area's slack bus is specified to be a bus that is not inside the area, then the area will be set off of AGC and the area slack designation ignored.
    • File Formats: When reading an EPC file, if the generators at an Area Slack Bus are not assigned the same area as their terminal bus, then the generator area designations are changed to be the terminal bus area.
    • Power Flow Solution: When a transformer or switched shunt is turned off control because it is regulating a bus that is already regulated by a generator or switched shunt, the messages give an indication of whether it is a generator or switched shunt that causes something to be turned off control instead of just always saying generator. Also, now only online transformers and switched shunts will be turned off control.
    • Transient Stability: Fixed reading of the BBSEX1 exciter. The min/max values were being read in backwards for Vrmax/Vrmin and Efdmax/Efdmin Transient Stability: Modified HYGOV, HYGOV4, HYPID, WEHGOV and HYGOVR hydro governors so that after the Pgv value drops below 0.005 per unit (0.5% of potential gate position typically), then we model the water column dynamics as algebraic. This avoids a potential divide by zero problem, and extremely fast dynamics at very low power outputs which cause numerical stability problems.
    • Transient Stability: When loading in a TSLimitMonitor from an AUX file, the designated filter was not being properly read. This has been fixed.
    • Transient Stability: Modified so that the last two parameters of a WT4E model are optional and assumed as default if omitted.
    • Transient Stability: Improved wind turbine modeling for Type 3 and Type 4 wind turbines when operating at low voltage. If the low voltage, active current management is active then the network boundary equations will solve more quickly that previously.
    • Transient Stability: Fixed to include the proper numerical validation for the ESST5B, ST5B, ESST6B, and ST6B exciters is performed.
    • Transient Stability: Further improvements to the GENTRA model