Software Patches

October 31, 2013

Features and Improvements

  • Transient Stability: Added frequency depdendence to constant impedance load models.
  • Transient Stability: Added speed voltage to GENTPF machine model.
  • Bug Fixes

    • Auxiliary Files (SCRIPT and DATA Sections): CalculateTLR, CalculateLODF, CalculateFlowSense, and Fault script commands could result in an error if trying to identify a branch by label or busname_nomkV. This has been fixed.
    • File Formats: When writing out the gcd flag to an EPC file, we will always write out a 0 because we don't actually write out any of these devices.
    • File Formats: In the RAW file format, switched shunts that are regulating generator Mvar output have their regulated bus set to the bus of the generator that they are regulating. In Simulator, the switched shunt and the generator that it is regulating must have the same regulated bus. We now make the appropriate conversions when reading and writing a RAW file. When writing, the regulated bus of the switched shunt is set to the bus of the first generator that is set to regulate the same bus as the switched shunt. If more than one generator exists, a warning message is written to the log.
    • General: When searching for a Line Shunt, the comparison of the ID was not being done in a case-insensitive manner. This has been fixed.
    • General: It was possible that a "fake" generator could show up in the case if an SVC was changed to different switched shunt type and the case was saved. This has been fixed.
    • Help: An update to the Chrome browser made it impossible to view the help files locally. This has been fixed. To repair your local help files, run the full installation file.
    • Sensitivity Calculations: When using the LODF matrix calculation, an internal initialization process was being done for each line outage/closure studied. This only needed to be done once at the beginning of the process. This fix will speed up the LODF matrix calculation considerably.
    • Transient Stability: Modified the writing to a DYD file when a WSCC load model is assigned to a specific LOAD record. The BLWSCC model in the DYD format is for a BUS record, but we will still write such a record if we come across the WSCC assigned to a LOAD. If there are multiple loads at the bus this could make the load model slightly different in the DYD file, but if this occurs a warning will be written to the message log.