Software Patches

January 9, 2019

Features and Improvements

  • Available Transfer Capability (ATC) Tool: Added two new Iteratively Found values when using the (IL) then Full CTG Solution method and iterating on an individual limiter: FULL_CTG_SELLER_LOST and FULL_CTG_BUYER_LOST. These indicate that either the Seller or Buyer has been completely disconnected when the contingency is implemented. The transfer limit that is reported is the total amount that could be ramped before the contingency caused the loss of either the Seller or Buyer.
  • File Formats: When loading a RAW file, the Mvar ouptut is estimated for FACTS which are converted into Continuous Switched Shunt objects in Simulator. This is because the RAW file does not specify the present operating point. To estimate this, the Mvar mismatch at the terminal of the FACTS is used. This has been modified so it sums up the Mvar at buses connected by low impedance branches to the FACTs terminal as well. Mvar are then shared by all FACTS that are connected to the same group of buses connected by low impedance branches.
  • Bug Fixes

    • General: The Select Network Cut tool was not working for branch objects. This has been fixed.
    • Sensitivity Calculations: When performing an LODF calculation on a branch with an extremely low impedance, it was possible in some situations for the LODF calculation to be performed perfectly and results calculate, but at the same time a dialog would appear indicating that the branch will create an island when taken out of service. This dialog was being shown in error and has been fixed.