Development of a On-Line Stabilization Method for the Local Power System with Large Capacity Generation Plants

Abstract

This paper presents an on-line stabilization control method developed aiming at maintaining transient stability in the local power system which includes large capacity generation plants. The most outstanding features of this method are that the power/angle curve is estimated using the on-line data of the active and reactive power measured at the generator terminal and the most optimum amount of generation shedding for stabilization is determined by applying the equal area method to this curve.After realizing simulation tests by using detailed models of power system, the authors have confirmed that the most optimum amount of generation shedding for stabilization could be comput ed to best suit various fault conditions, regardless whether symmetrical or asymmetrical.Furthermore, it was also clarified that the sampling period of the on-line data to be used could be for several tens of milli-seconds after clearing the fault. Thus, this method is expected to serve as an effective control logic for the practical stabilizing system.