Software Patches

April 22, 2020

Features and Improvements

  • General: Added Tap Step Count field with Branch objects to show the total number of tap steps for a transformer.
  • PV and QV Curve (PVQV) Tool: Added options to track loads in Quantities to Track with the PV and QV tools. MW, SMW, IMW, ZMW, Mvar, SMvar, IMvar, and ZMvar can now all be tracked and plotted.
  • Bug Fixes

    • Auxiliary Files (SCRIPT and DATA Sections): When using the ATCWriteResultsAndOptions script command and when saving ATC results and options from the ATC dialog, Injection Groups that are used for the source and sink and Interfaces that are used with ATC Extra Monitors and multiple scenarios, along with any injection group or interface dependencies, will be saved to the resulting auxiliary file. When saving contingency settings along with the ATC options, dependencies will always be saved now. Previously all Model Conditions, Model Filters, Model Expressions, and other object types that are used to define Remedial Actions were being saved even if they weren't used as part of a Remedial Action. Interfaces and Injection Groups are now included in the dependencies for Remedial Action definitions.
    • Contingency Analysis: When setting up a contingency solution it was possible that a generator that was at it's Max or Min MW limit may appear to be violating it's limit and thus turned off AGC during the contingency solution. This has been fixed.
    • Difference Case Tool: When saving objects to an EPC file from the Difference Case tool or from case information displays, three-winding transformers were not being written. This has been fixed.
    • Model Explorer: Updated Model Explorer folder's object count for OPF Phase Shifters to match actual phase shifters, and not all branches.
    • Transient Stability: Updated the handling of the Bmax limit for SMIB calculations on several exciters.
    • Transient Stability: Fixed some issue with limits being checked during the SMIB calculations. There are now much fewer positive eigenvalues.
    • Transient Stability: An access violation could result if using a transient stability contingency action on a generator to Enable AGC or Disable AGC if the generator had no AGC model assigned. This has been fixed.
    • Transient Stability: Fixed error in REGC_B model with the DQFlag. Value of 0 means Q-priority and non-zero is P-priority. This was backwards.