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Software Patches

August 12, 2010

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Features and Improvements

  • PV and QV Curve (PVQV) Tool: The more flexible plotting environment available in Transient Stability has been integrated into the PV Curve tool. This is available under "New Plots" on the PV Curve dialog. Note that this is available in addition to the previous plotting tool.
  • QV Curves: Added the ability to plot multiple QV curves on the same plot.
  • Transient Stability: For the IEEEG1 governor model, the following two relationship must be true. K1+K3+K5+K7=1 and K2+K4+K6+K8=1. If they are not true, Simulator will now normalize the values to enforce these equalities.
  • Transient Stability: When choosing to show a transient stability plot on the execution of the stability run, the simulation will now automatically update the plots with appropriate data after each interval check. Previously the user would also have to specify this update if they want the plots to actually show data.

    • Bug Fixes

    • Available Transfer Capability (ATC) Tool: Corrected loading in transfer limiters from an aux file when they are processed for only a single run and not for multiple scenarios.
    • Distributed Computation: Continued stability improvements for the distributed computation add-ons.
    • Power Flow Solution: Fixed improper handling of magnetizing conductance in some locations when using the DC power flow approximation.
    • Transient Stability: Fixed an incorrect choice in the choices appear in the Toggle Drop-Down for generator objects's Governor Response Limits.
    • Transient Stability: Fixed typo for the column heading which mixed up the K1 and K2 parameters for the IEE2ST stabilizer.
    • Transient Stability: Fixed the running of multiple transient contingencies to obey the SKIP field of a transient contingency. Previously we were always running all the transient contingencies. It will now skip them as specified.
    • Transient Stability: For some generators there were hard limits on the value of H, D, Tdo, Tdop, and the Saturation values. These limits previously were auto-corrected but have been changed to leave the values and only create a warning.