A new power sensitivity method of ranking branch outagecontingencies for voltage collapse

摘要

The objective of this paper is to present a powerful procedure fornidentifying severe single branch outage contingencies with respect tonsaddle-mode bifurcation induced voltage collapse, given a power systemnoperating point, a load demand forecast, and a generation dispatch. Thennew power sensitivity ranking algorithm for voltage collapse, callednΛ/MVA sensitivity, provides more accurate "distance to collapse"nestimates than linear admittance sensitivity, yet requires only slightlynmore computation time. The distinguishing features are the ability (1)nto rank all branches in a large-scale power system quickly, and (2) tonestimate the outage contingency bifurcation values accurately. As annillustration, the new Λ/MVA sensitivity ranking algorithm cannestimate all 6689 single branch outage contingency bifurcation pointsn(Λ*ctgc) of a 3493 bus power system within 3% relativenerror, except for two branches within 7%, in less than 4 min on a 180nMHz PentiumPro PC