Features and Improvements
- General: Added a new button on the Case Information Ribbon for Cleanup Case Memory. This features provides a summary of how much of the PWB storage is being used to store different portions of the case data. In particular Transient Stability results and Geographic Regions can consume a large amount of memory. The dialog then provides convenient mechanisms to delete this information permanently
- Oneline Diagrams: The variable tap ratio is always on the From-Bus side, but on a oneline diagram it was difficult to tell which side that is. Modified the transformer symbol to provide a visual indication about which side of the transformer is the variable tap ratio on.
- Transient Stability: For the IEEEG1_GE and IEEE_G3_GE models, a negative db2 parameter has always been treated as a 0.0 deadband. A warning message has been added to alert the user this is happening.
- Oneline Diagrams: Fixed access violation that could occur when adding a new bus to a Bus Spatial View Oneline.
- Power Flow Solution: Eliminated some unnecessary recalculation of flows and sensitivities for interfaces that contain contingencies. These only need to be redone if there IS a change to system topology or elements in the interface and they were being redone if there MIGHT be a change to the elements within the interface.
- Sensitivity Calculations: The calculation of PTDFs and OTDFs for ATC analysis will now include the impact of losing a bus that is participating in the transfer because contingency actions isolate the bus. Previously only the impact of generator and load outages was included.
- Transient Stability: For non-linear gain look up tables in Governor models (for the gate position signal), additional checks have been added. Previously when all GV AND PGV values were 0.0, then the non-linear gain block was ignored and a fixed gain of 1.0 was used. Additional checking is now done so that if all GV values 0.0 then the non-linear gain block is also ignored. Also, if all PGV values are 0.0 then the non-linear gain block is ignored.