蓄电池故障引发辅助强励系统误动的风险分析

发电机是电力系统中最重要的电气主设备之一,其运行状态直接影响着电力系统的安全与稳定。针对某发电厂蓄电池故障、绝缘监测仪烧毁、励磁电流示值多次出现异常突变的真实事件,对励磁系统误动风险进行了分析。利用PSCAD/EMTDC电力系统仿真软件建立了发电机励磁系统及蓄电池系统的联动模型,对发电厂高阻接地、悬浮系统中单点接地和两点接地等多种故障风险进行了仿真分析,确定了提高发电厂蓄电池供电可靠性的技术原则和措施,为容量为500 MW以上的发电厂发电机现场运行以及故障分析提供了参考。

Risk Analysis of Misoperation of Auxiliary Strong Excitation System Caused by Battery Failure

The generator is one of the most important electrical equipment in the power system,and its operating state directly affects the safety and stability of the power system.Aiming at the real events of battery failure,burnout of insulation monitor and abnormal abrupt change of excitation current indication in a power plant,this paper analyses the risk of misoperation of excitation system,establishes the linkage model of generator excitation system and battery system by PSCAD/EMTDC power system simulation software,simulates and analyses the risk of single point grounding and two point grounding in high resistance grounding or suspension system of power plant,and determines the technical principles and measures to improve the reliability of battery power supply in power plant.It can provide reference for generator field operation and fault analysis of power plant with capacity of more than 500 MW.