Bug Fixes
- Contingency Analysis: Fixed bug caused by recent bug fix of 10/17/24 that could occur when running contingencies that BOTH Open and Close(or Bypass) a branch at the same time. The angle smoothing was improved for this situation in general, however it introduced a bug if the opening of branches was completely islanding a portion of the system. The contingency analysis would report strange flow and voltage violations in the part of the system that was islanded.
- Optimal Power Flow (OPF): This bug was introduced on 03/18/2024 while trying to fix another earlier bug introduced on 09/27/22. The current bug fix is for generators that have a negative MinMW value, and were available for dispatch during an OPF/SCOPF, and had a cost function that would allocate the MinMW as their output. These are renewable plants in the "charging mode", that are perfectly reasonable with a negative MW output with a monotonically increasing cost function. During OPF or SCOPF, these generators were erroneously being set to a value larger than the MinMW, i.e., charging lesser than their cost functions would actually allow them to. This was causing other generation to ramp down erroneously, and that severely affected the convergence of the OPF or SCOPF iterations. In addition to this issue being fixed, the earlier bug that was fixed on 03/18/2024 also remains fixed.
- Security Constrained OPF (SCOPF) Tool: See OPF update for 10/30/24