A Fast Estimation of Load Power Margins for Generator Outage Contingencies

Abstract

This paper proposes a fast computation method to assess the voltage stability of a power system for generator outage contingencies.The load power margins with respect to saddle node bifurcations under faulted conditions are efficiently estimated. Nonlinearities of the power flow equations are partially taken into account to considerablely improve the accuracy of stability assessment. Numerical exami-nations through IEEE 14, 30, 57 bus systems show that, even in such small systems where the effects of generator outage is much larger than those of large systems, maximum error is less than 8%.