Software Patches

March 28, 2013

Bug Fixes

  • Power Flow Solution: Fixed a power flow convergence problem that could be caused by generators being taken off AVR control due to them oscillating by repeatedly hitting and backing off Mvar limits. This problem could occur if using the option to check generator Mvar limits immediately and the option to prevent controller oscillation.
  • Power Flow Solution: In a full-topology model while not using the option to use topology processing, the flows on breakers could be shown as zero. This didn't affect the power flow solution, just the displayed flows on breakers. This has been fixed.
  • Transient Stability: Updated the user interface for calculating V curves.
  • Transient Stability: Fixed a few problems with SVC models. The gain K/s at the PIO output of an SVC can be zero.