A Study of Application of OPF with N-1 Criterion to a Large Power System

Abstract

This paper presents a practical method for OPF (Optimal Power Flow) with N-1 criterion, that can apply to a large power system.Though there are some OPFs which considers N-1 criterion, it is difficult to apply them to a large system.Because its calculation time and used memories increase rapidly as a scale of the system grows up.This paper suggests a formulation using power flow sensitivities to constrain power flows under assumed contingencies.This formulation reduces parameters in the OPF, and allows to cut down redundant constraints.The accuracy and effectiveness are probed through analyzing a large power system which consists of 185 generators, 1048 buses, and 1494 branches.