Features and Improvements
- Contingency Analysis Tool: Injection Group contingency actions using Merit Order or Merit Order Open now include loads in addition to generators. If using Merit Order Open and both gens and loads exist in the injection group, only loads will be opened if the change is to increase injection and only generators will be opened if the change is to decrease injection. When using Merit Order, both gens and loads will move to their appropriate limits. Loads where both the Min and Max limit are 0 can only move to 0 MW. If using Merit Order Open and the change is to increase injection and no loads exist in the injection group, generators will be moved toward their max limits instead. If the change is to decrease injection and no generators exist, loads will be moved toward their max limits instead.
*** You may need to modify your injection groups if you have been using Merit Order with injection groups containing both loads and generators and you want to maintain the same functionality. *** - General: If using the Scale tool to scale an Injection Group and using Merit Order Dispatch, loads will now be included in the dispatch. Previously, any loads in the injection group were ignored. Loads will move towards either their minimum or maximum MW limit as appropriate. If both the minimum and maximum limits are 0, loads will only be allowed to decrease to 0 MW. Mvar load will be adjusted by keeping a constant power factor.
*** You may need to modify your injection groups if you have been using Merit Order with injection groups containing both loads and generators and you want to maintain the same functionality. *** - PV and QV Curve (PVQV) Tool: When using Injection Group Ramping option for Merit Order Dispatch, loads will now be included in the dispatch. Previously, any loads in the injection group were ignored. Loads will move towards either their minimum or maximum MW limit as appropriate. If both the minimum and maximum limits are 0, loads will only be allowed to decrease to 0 MW. Mvar load will be adjusted by keeping a constant power factor.
*** You may need to modify your injection groups if you have been using Merit Order with injection groups containing both loads and generators and you want to maintain the same functionality. *** - Time Step Simulation: When changing the injection of an Injection Group and using Merit Order Dispatch, loads will now be included in the dispatch. Previously, any loads in the injection group were ignored. Loads will move towards either their minimum or maximum MW limit as appropriate. If both the minimum and maximum limits are 0, loads will only be allowed to decrease to 0 MW. Mvar load will be adjusted by keeping a constant power factor.
- Transient Stability: Fixed a bug in Distributed TS. When an error occurred with COM, it was obscured by a secondary access violation; this is now resolved.
- Transient Stability: Fixed bug with governor model W2301 when K <> 1.
- Transient Stability: Fixed network reference frame for infinite bus machines.
- Transient Stability: Fixed limit issue with exciter model ESDC4B.
- Transient Stability: Fixed initialization of exciter model ESST4B if Vgmax is active during initialization.
- Transient Stability: Fixed error in setting up governor model GGOV1 if Kpload = 0.