Software Patches

April 5, 2011

Features and Improvements

  • Auxiliary Files (SCRIPT and DATA Sections): Added optional parameter to SaveCase script command for use when saving an EPC file. New format is SaveCase("filename",SaveFileType,[PostCTGAGC, UseAreaZone]); PostCTGAGC by default is set to NO. Set to YES to set the base load flag in the EPC file based on the Post-Contingency Prevent AGC Response setting. If preventing post-contingency AGC, the base load flag is set to 1. If not preventing post-contingency AGC or this option is set to NO, the base load flag is set to 0. UseAreaZone by default is set to NO. Set to YES to limit the entries in the EPC file based on the area/zone/owner filter.
  • Available Transfer Capability (ATC) Tool: Removed the option Apply PTDF Cutoff for Limiting Elements with Contingencies. It really didn’t make any sense to eliminate limiters that are limiting during a contingency if they are not limiting in the base case.
  • Bus View and Substation View Onelines: Now storing option settings for displaying MW branch, Mvar branch, and MW interface flows in absolute value in the registry. The values stored in the registry will be used as the defaults for these settings when oneline options don’t exist for the Bus View or Substation View with the power flow case (PWB).
  • General: Amps field is now available with loads.
  • Time Step Simulation: When using the column plotting option to plot time points, time scale will now be in seconds if no difference between time points is greater than one minute.
  • Bug Fixes

    • Auxiliary Files (SCRIPT and DATA Sections): Modified to ensure that Area or Zone information is written using secondary key fields if requested. This affects Limit Monitoring Settings, Contingency Area Make-Up Power, and OPF options.
    • Contingency Analysis: Fixed problem with linear contingency analysis that could cause incorrect results due to islanded generation or load not being accounted for. This also affects linear ATC analysis.
    • Fault Analysis: Fixed problem with reading in the limits for ZBRs from an Areva hdbexport CVS file.
    • Fault Analysis: Fixed a problem when writing to an EPC file so that generator setpoint voltages get reflected correctly in the scheduled voltages of the buses that they are regulating.
    • Fault Analysis: When writing to RAW and EPC files, account for generators that are on line drop/reactive current compensation by setting them to regulate their own terminal bus to the present voltage at the terminal bus.
    • Model Explorer: Fixed random access violations that could occur when using the Model Explorer.
    • Power Flow Solution: Additional code was added to ensure that generators regulating the same bus have the same setpoint. This change enhances similar changes made in the Feb. 15, March 15, and March 24 patches.
    • Security Constrained OPF (SCOPF) Tool: Fixed problem with not being able to run more than one Outer Loop Iteration (contingency loop) during the AC SCOPF. The process would abort because it thought that there were no control changes during the first outer loop iteration.