Posturing Unit Commitment

Unit Commitment Changes can greatly reduce the number of contingencies that cause voltage instability by providing reactive reserves to subnetworks that are in the control region for one or more loadpockets. By adding these reactive reserves, the Unit Commitment changes can dramatically reduce the structural and contingency vulnerability of these loadpockets in the study region.

  • Unit Commitment changes in problematic subnetworks with very little or no reactive and active reserves has been shown to arrest voltage instability and dramatically reduce the number of contingencies with no dynamic approximation solution affecting the associated load pockets
  • Unit Commitment is effective in arresting voltage instability in load pockets with little reactive reserves produced by weak transmission and/or distribution systems, strong transmission corridors that are expected to provide reactive supply, and seams in the distribution and transmission system