基于限流器本体信号的短路故障快速识别方法  

Rapid Fault Identification Method Based on Body Signal of Fault Current Limiter

作　　者：赵永熹[1] 王华昕[1] 

机构地区：[1]上海电力学院电力与自动化工程学院,上海市杨浦区200090

出　　处：《电网技术》2012年第11期247-251,共5页Power System Technology

基　　金：上海市教委优青基金项目(sdl10014);上海市教委重点学科建设项目(J51301)

摘　　要：短路故障快速识别是串联谐振型限流器控制策略的重要环节。文章利用限流器谐振元件电压差在短路故障时会发生突变的机理,提出谐振电压差识别方法。从合闸角和故障距离等参数角度分析了识别方法的时间特性,搭建了基于可编程技术的触发系统,用模型实验验证了所提方法的快速性。仿真结果表明谐振电压差法响应速度快,而且不受故障参数变化的影响,但会受到断路器开闭操作的干扰,因此谐振电压差法需和短路电流瞬时值法相互配合。模型实验表明谐振电压差法能在1 ms内发出故障判据信号,从而能极大地提高限流器工作的快速性。Fault current rapid identification is the key of series resonant fault current limiter（SRFCL） control strategy. The paper introduces resonant voltage difference method based on the theory which voltage difference of SRFCL resonant component will mutate at fault.Time characteristics are analyzed on the parameters of the closing angle and fault distance.Fast trigger system based on programmable technology is built and the speed of method is verified by model test.Simulation results show that the method has good response and is not affected by fault parameters,but it is interfered with the breaker close and open.So it should be cooperated with instantaneous value of fault current.Model experiments show that it can supply failure criterion signal within 1 ms,thus can improve the speed of SRFCL greatly.

关 键 词：串联谐振型限流器 故障识别 谐振电压差法 快速触发系统 

分 类 号：TM771[电气工程—电力系统及自动化]