Features and Improvements
- File Formats: PowerWorld has found many RAW files with FixedNumBus groupings with a mixture of Nodes with Connected and Disconnected Status. At some of these nodes with Mixed Status, there are generator, load or shunt objects that meet the following criteria (1) Terminal is at a disconnected node, (2) device status = 1, and (3) MW or Mvar injection exists. Because the terminal nodes are disconnected for these devices by substation switching devices, they can not provide injection to the system. PowerWorld has found many RAW file solutions that have these disconnected devices supplying or absorbing power. Various messages log information is now displayed when this is encountered along with recommended switching devices that can be closed to replicated the RAW file solution.
- Transient Stability: Implemented a new UEL2CPTI model, that is created when reading in the UEL2C model record in a PTI DYR file. This new model has extra model parameters compared to a UEL2C model GE DYD file -- (i) an extra 11th pair (P10, Q10) in the lookup table, (ii) an extra limit pair (VULmax/min) on the VUEL output signal, and (iii) an extra parameter (Quad) that allows the lookup table to be used as mirrored around the MVAR axis when MW values are negative. This extra parameters are read/written from the text formats, and the are fully implemented during the dynamic simulation.