This paper presents an on-line stabilization control method developed with the aim of maintaining transient stability in a local power system which includes large-capacity generation plants. The characteristics of this method are that the powerlangle curve is estimated from the on line active and reactive power measured at the generator terminal, and the optimum generation shedding for stabilization is determined by applying the equal area method to this curve.Simulation tests using detailed models of the power system confirmed that the optimum generation shedding for stabilization could be computed for various fault conditions, both symmetrical or asymmetrical.It was also determined that the on-line data could be sampled for several tens of milliseconds after clearing the fault. Thus, this method provides effective control logic for practical stabilizing systems.1SSN0424-7760/92/0001-0039$7.50/0 Q 1992 Scripta Technica, Inc.
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.
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