Software Patches

November 9, 2017

Features and Improvements

  • Case Information Displays: On the Multi-Terminal DC Line and Two-Terminal DC line case information displays, add the ability to right-click on a selection of devices and choose "Remove Device and Converter to Equivalent Loads". This will add in new load objects which replace the MW and Mvar injections coming from these devices and then delete the DC system device.
  • Scheduled Actions: Added ScheduledActionSetReference script action to save the current system state as the reference state for Scheduled Actions.
  • Scheduled Actions: Added Scheduled Actions tab to dialogs for Gens, Loads, Lines, Switched Shunts, and Interfaces containing a case information display listing the Scheduled Actions that target the selected object. The tab is hidden if there are no Scheduled Actions defined in the case.
  • Transient Stability: Added the ability to rename the Device ID from a relay GUI dialog. It will only rename the Device ID if the new Device ID does not exists. If the Device ID already exists then the following message will appear: A Device ID already exists at from/to end (Line Name). Please Modify that particular (Relay Name)relay.
  • Bug Fixes

    • Available Transfer Capability (ATC) Tool: Fixed some inconsistencies in the system state when restoring the initial ATC state when using topology processing and the status of breakers has changed between the current state and the initial state.
    • Available Transfer Capability (ATC) Tool: Fixed a bug when using one of the iterated ATC methods and using the option to close breakers to energize switched shunts or using one of the injection group ramping methods that allow breakers to close to include generators in the dispatch. If a breaker ends up being closed by either of these processes during the ramping and the breaker is part of a contingency, the breaker most likely would have been ignored when calculating the LODFs. The LODFs are calculated once at the beginning of the ATC process for speed. When the LODFs are needed for the contingency including the breaker an access violation would have resulted. This has been fixed.
    • File Formats: Fixed bug that could occur when converting the EMS DC System into a DC model consistent with PowerWorld Simulator. If the DCCNV grouped in a POLE record in the EMS hdbexport file were out-of-service AND those DCCNV were connected to different XF records which were also separated from another by switching devices then it was possible for the DC system to be read incorrectly. This was an unusual situation and has been fixed.
    • Power Flow Solution: Fixed potential error in the power flow solution that could occur when a inverter bus hit a firing angle limit while controlling MW.
    • PV and QV Curve (PVQV) Tool: Fixed some inconsistencies in the system state when restoring the initial PV state when using topology processing and the status of breakers has changed between the current state and the initial state.
    • Scheduled Actions: Restructured internal lists of Scheduled Actions and Scheduled Action Groups to improve performance with large sets of schedules.
    • Scheduled Actions: When reverting scheduled actions to normal status and the object being closed is a Breaker, we also close Disconnects that are in series with the Breaker. There have been some cases where Load Break Disconnects are found to be in series with the Breakers being returned to service and these are normally closed. If we do not also close the Load Break Disconnects we cannot return lines to service. Now when returning Breakers to service we will also close any Load Break Disconnects that are normally closed and they are in series with the Breaker. If we are returning a Load Break Disconnect to service as the element that is part of the schedule we will NOT also close Load Break Disconnects that are in series.
    • Time Step Simulation: Corrected the Starting and Ending Time controls so that these can be specified down to seconds rather than only by hour.
    • Transient Stability: Modified documentation of DER_A to make it clear particular parameters can be equal to zero.
    • User Interface Dialogs: On the branch dialog only show the transformer tap and phase shifter fields if the branch is a transformer or phase shifter or these values have been set to something other than defaults of 1 for tap and 0 for phase shift.