Software Patches

June 27, 2019

Features and Improvements

  • Case Information Displays: Added a field [sgNERCCIP14AggWeight] to Substations, which is based on the criteria in NERC CIP-14-1
  • Bug Fixes

    • Auxiliary Files (SCRIPT and DATA Sections): When loading an InterfaceElement from an auxiliary file where the element is a branch that is part of a multi-section line and the branch is identified as the multi-section line and section number, it was possible that the Near Bus and To Bus of the monitored line would be reversed. This has been fixed.
    • QV Curve Tool: With certain case topologies, it was possible for the fake generator used when tracing a QV curve to regulate a different bus than the terminal bus. This would occur if the fake generator is attached to a bus that is attached to other buses through very low impedance branches, i.e. ZBRs. As a standard part of how generator remote regulation works in Simulator, a single bus within a ZBR grouping is selected to be regulated in the event that multiple generators are regulating buses within the same ZBR grouping. This prevents the generator voltage controls from conflicting. If the fake generator terminal bus is not selected as the regulated bus, it is possible that the voltage at the terminal is not exactly the setpoint voltage that is set at each step in the curve tracing. If the difference between these voltages is too large, Simulator will stop tracing the curve without reaching the bottom of the curve. This problem has been fixed by ensuring that the fake generator terminal bus is selected as the primary bus for the ZBR grouping, which means that it will be selected as the regulated bus.
    • Transient Stability: Modified the result storage for transient load records so that they return only the LOAD portion of the model under the field MW. Previously they were returning the Load with the distributed generation subtracted from it when used in combination with the distribution equivalent.