Preventive Load Shedding Control

Overview
PLSC decreases load within the control region of the load pocket to obtain a dynamic approximation solution for a non-solving contingency by increasing the reactive reserves to a sufficient level for the contingency so that the solution is found. Conventional P-V and V-Q methods do not define loadpockets correctly and thus can not predict control regions or problematic subnetworks which make them incapable of predicting the control region used in Preventive Load Shedding Control.

More Comprehensive
  • A Preventive Load Shedding Control is computed for every VCCS contingency
Structural
  • Inhibits cascading voltage instability by restoring reactive reserves to exhausted subnetworks which prevents further exhaustion of other subnetworks in the loadpocket
  • There is a very high success rate for PLSC reinforcing the understanding of the structural causes of voltage instability in a loadpocket and how to prevent it
Diagnostic
  • Load shedding is performed in subnetworks of the control region for a contingency based on a priority that reflects its contribution to initiation and propagation of cascading voltage instability
  • Loadshedding occurs in the problematic subnetworks in a system if they exist