Bug Fixes
- File Formats: Fixed a bug where reading or appending 3 winding transformers would still try to create an object even if the primary and/or secondary bus didn't exist in the case. This partial data was then creating hangs around and caused wacky problems later.
- PV and QV Curve (PVQV) Tool: The 12/19/25 patch for Simulator version 24 has a fix for access violations that could occur when deleting objects that are monitored with PV and QV quantities to track. This fix resulted in only one field type being monitored for each type of object monitored. This problem has been fixed so that all field types are now monitored for each type of object that is being monitored.
- Transient Stability: When using transient limit monitors for Bus objects and also using the Integrated Topology Processing add-on, there could be access violations that prevented the simulation from running. This has now been fixed.
- Transient Stability: Simulator has for many years allowed a Load object to be assigned 2 load models simultaneously
1. A model with dynamic states like MOTORW, which has a fractional portion of the load
2. A second model that was algebraic only and covered the "remainder" of the load (WSCC)
The code around this concept always assumed the user would never specify two models that had dynamic states simultaneously. This patch fixes a bug when this is seen which resulted in the load being double-counted. - Transient Stability: The PERC1 model can be used as one of the components referred to by a CompLoad model. When this is done with multiple components, then the parameter QPRatio is used to assign Mvar to the PERC1 model and then any extra Mvars are modeled as part of the distribution system equivalent. If however the CompLoad model has only ONE component assigned and it is a PERC1, then it should behave the same as if the load had a stand-alone PERC1 model and default back to ignoring the QPRatio and assigning MVar according to the flow solution Mvar value. This patch changes it so that special treatment is used if the PERC1 is the only component in the CompLoad model.