摘要
换相失败是直流系统常见的故障之一,连续换相失败或者多回直流同时换相失败,将会严重危害交直流系统的稳定运行。因此,换相失败的判断是一个非常重要的问题。机电暂态程序具有模型简单、仿真规模大、计算时间短等特点,而且仿真精度能够满足电力系统的计算要求,常常用于分析大型交直流混合电网的换相失败原因。在阐述换向失败的机理及其影响因素的基础上,分析了机电暂态程序的直流模型和换相失败判据,并且通过一算例计算,比较了国内常用的机电暂态程序BPA和PSS/E的仿真结果,着重分析了两个程序用于换相失败研究的范围。
Commutation failure is one of the common faults of DC system,continuous commutation failure or multiple HVDC commutation failure will seriously endanger the stable operation of the AC and DC systems,and thus commutation failure judgment is a very important issue.Electromechanical transient program often has simple models,large simulation scale,short computation time,and it＇s simulation accuracy can meet the power system calculation requirements,so it is often used for large AC-DC hybrid grid commutation failure research.This paper describes the commutation failure mechanism and its influencing factors first,then analyzes the DC models and commutation failure criterion of electromechanical transient program.Finally,compare the simulation results of the most commonly used electrome-chanical transient program BPA and PSS/E through an example,and analyze the scope of these two programs for commutation failure research.
出处
《电力与能源》
2013年第1期42-46,共5页
Power & Energy
关键词
换相失败
交直流
机电暂态
Commutation failure
AC and DC systems
Electromechanical transient program
