在高压交流输电系统(HVAC)发生短路故障时,极大可能会产生含暂态分量(short circuit current transient component,SCTC)的短路故障电流;当SCTC含量很大时甚至会产生短路电流的零点漂移现象,会对故障限流器(fault current limiter,FCL)的限流工作和参数设计造成很大的影响.针对上述问题,提出了一种SCTC泄能型故障限流器(SCTC energy drain type fault current limiter,SEDFCL)及其参数设计方法,可以加快SCTC的衰减.首先,分析了SEDFCL与SCTC的相互影响和SEDFCL的电磁路工作机理,并研究了SEDFCL场路耦合特性,对电磁参数进行了设计;然后,通过有限元仿真搭建了220 kV SEDFCL模型,探究了SEDFCL结构的有效性、合理性、RC参数的调节作用,以及故障情况下SEDFCL功能的有效性;最后,搭建一台小容量样机,建立试验平台并进行样机试验,证实SEDFCL结构和功能的有效性.与传统五柱式限流器(five-column hybrid excitation type FCL,FHETFCL)相比,SEDFCL将时间常数显著降低117.66%,限流效果提高6.29%.
Parameter Design of Fault Current Limiter for High Voltage AC System Considering Transi-ent Component of Short Circuit Current
When a short circuit fault occurs in a high-voltage AC(HVAC)transmission system,it is highly likely to gen-erate a short circuit fault current including current transient component.When the short circuit current transient component(SCTC)is very large,the phenomenon of current-zero offset of short circuit current will even arise,which will have a great impact on the current-limiting operation and parameter design of FCL.To solve the above problems,a SCTC energy drain type fault current limiter(SEDFCL)and its parameter design method are proposed in this paper,which can accelerate the SCTC attenuation.Firstly,the generation mechanism of SCTC in HVAC system and the electromagnetic circuit working mechanism of SEDFCL were analyzed,and the field-circuit coupling model of SEDFCL and HVAC transmission system was established.Then,a 220 kV SEDFCL model was built by finite element simulation to explore the validity and rationality of SEDFCL structure,the regulating effect of RC parameters,and the effectiveness of SEDFCL current limiting function in the case of failure.Finally,a small capacity prototype was built,a test platform was estab-lished,and the prototype test was carried out,which confirmed the validity of SEDFCL structure.Compared with the traditional FHETFCL,SEDFCL can significantly reduce the time constant by 117.66%and improve the current limit ef-fect by 6.29%.
transient componentfault current limiterenergy drainfield-circuit couplingfinite element analysis
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