- Auxiliary Files (SCRIPT and DATA Sections): Fixed bug in SetSelectedFromNetworkCut script command that reversed the order of the LowerMinkV and LowerMaxkV values. This was reversed even if using the defaults. This would result in branches not being selected.
- File Formats: The ability to add DistMW and DistMvar (distributed generation MW and MVar) to a load record was added in Simulator Version 19. A bug was fixed in Simulator Version 20 on September 18, 2018 related to performing area generation control in areas that contained this distributed generation. For cases in Version 20 and Version 19 created before this change however and then stored to a PWB file, some internal solution variables were stored slightly off. This could cause strange behavior when opening a PWB file stored in version 19 into Simulator 20 and 21. The behavior would result in a bunch of generation moving immediately when solving a power flow. Assuming the inner power flow solution worked Version 20 and 21 would move the generators right back to where they started and from that point on never exhibit this behavior.
- Transient Stability: Added the ability to only operate one relay at a time in a load. It follows the same order as before just only added the first or relays found first at any level.
- Transient Stability: Greatly improved the network boundary equation solution convergence for events near DC line and Multi-terminal DC line terminals.