大型发电机干扰下发电机保护的性能.doc

English Material: Performance of Generator Protection During Major System Disturbance Abstract： Disturbance is?an inherent part of easy power system during the transition from one steady-state operating condition to the next. Protective relays may experience abnormal operating conditions during this transient period. This paper reviews control actions drat play a part during the transition and provides technical guidance to the industry on the application and setting of generator protective relays that can operate during major system disturbances. Index Terms： AC generator excitation、ac generator protection、 governors、power system control turbines. Ⅰ.INTRODUCTION： Every power system is subject from time to time to transient disturbances primarily due to faults and/or switching of major load. Normally, the system adapts to a new steady-state condition with the help of generator excitation and turbine governor control systems. A variety of additional power system control schemes may also be used to help restore an acceptable new steady-state condition. One of the lessons learned from the past major disturbances is that some of the functions associated with generator protection may operate during these transient conditions. It is important for the relays to provide protection while optimizing their coordination to avoid undesirable operation during the system disturbances and thereby help preserve the integrity of the power grid. Brief descriptions of past power system disturbances as well as generator excitation, turbine governor, and power system controls are included in this paper. The balance of the paper discusses the generator protection functions that may operate during system disturbances. Ⅱ. POWER SYSTEM DISTURBANCES： Power system disturbances are events that produce abnormal system conditions and the state of the system may change from normal to emergency. These disturbances can be classified into two groups-small and large. Large disturbances are a challeng