An adaptive localization method for real-time security analysis

The authors present a new adaptive localization method for fast real-time AC security analysis using a modification of the fast decoupled power flow algorithm. On each iteration, a localized region is adaptively identified as the set of buses whose mismatches exceed specified tolerances. The sparse mismatch vectors for these buses are then efficiently processed by sparse vector methods to solve the significant bus voltage magnitude and angle corrections required for security analysis. Reactive power limits on generators are enforced and all other appropriate automatic control adjustments are performed for the localized solutions. Test results on two practical systems show CPU time improvements over full AC solutions ranging from 3:1 to 5:1