Software Patches

December 19, 2017

Features and Improvements

  • Transient Stability: Added new Branch field for storing results called "Minimum Profile Vpu". This field calculates the minimum voltage along the length of the series R and X of a branch. Typically this value is at one of the terminal buses, but it can sometimes end up between the two buses. It is possible for that voltage to approach zero even when both terminals are not zero. This is an indication of the system going out of step. One can monitor this branch field for an indication of the system going out of step.
  • Bug Fixes

    • File Formats: When reading the Areva CTG CSV file, the type POLEW is interpreted the same as POLE meaning that the DC Converter is taken out of service. This was working fine, but an incorrect message log warning was being written regarding saying the POLEW was an "Unidentified type". That error message was wrong and has been removed.
    • Optimal Power Flow (OPF): In a very rare situation, fixed the evaluation of whether to monitor an interface that contained a multi-section line object. If the only object in the interface was a multi-section line and the monitored end of the multi-section line ended up begin a branch that was not going to be monitored we would then not monitor the entire interface. The particular example we had was the first branch of a multi-section line was a bypassed series cap and we never monitored bypassed elements. This has been fixed so that as long as at least one branch within the multi-section line is monitored we will consider the multi-section line to be monitored.
    • Transient Stability: When right clicking on Validation Errors, Warnings, and Information Messages and choosing Show Dialog, the dialog was only appearing for messages related to generator objects. This has been fixed so that the dialog will appear for messages related to loads, shunts, branches and other objects as well.