Software Patches

September 27, 2014

Features and Improvements

  • Transient Stability: Added error checking for using a distribution equivalent which could not support the load specified. This was caused because the distribution equivalent impedances are given on an MVABase that is proportional to the MW of the load. In a situation which had a load of 2.0 MW and 120 Mvar, the load would exceed the maximum power transfer of the distribution system because the Mvar values was so huge relative to the MW. An appropriate error message will now be shown.
  • Transient Stability: Modified to not model motors which are less than 0.01 MW and added appropriate warning message to indicate this
  • Transient Stability: added error checking for WT3E and WT3E1 model to disallow Kpp=0 AND Kip=0. That doesn't make any sense and is showing up in the MMWG cases at a generator.
  • Bug Fixes

    • Transient Stability: Fixed error initializing Pref for the GGOV1 governer if both Kigov = 0 AND Rselect = 0.