新型磁控开关型故障限流器拓扑及试验研究

Topology and Experimental Study on a Novel Magnetic-Controlled Switcher Type Fault Current Limiter

基于饱和铁心型高温超导故障限流器的拓扑,提出了一种适用于中高压电网的磁控开关型故障限流器拓扑结构,在偏置回路中串联了一个限流电感,通过故障前后交流电流的变化自动实现限流电感的退出和接入,从而实现对短路电流的限制,并研制了一台220V/50A试验样机。对限流器样机的试验结果表明,磁控开关型故障限流器在正常工作时电压损耗很小,对线路几乎没有影响;故障发生后,限流电感立即自动插入故障回路进行限流,基本不产生谐波,运行控制灵活且简单可靠,对短路电流具有快速、有效的限制作用。

Based on the topology of saturated iron core high temperature superconducting fault current limiter （FCL）, a new magnetic-controUed switcher type FCL suitable to medium and high voltage power network is proposed. A current-limiting inductance is series in bias circuit, the current-limiting inductance can be automatically inserted or disconnected according to variation of AC current before and after fault, so fault current limiting is realized. An experimental prototype of 220V/50A limiter is developed. The experimental results of this prototype of FCL show that the magnetic-controlled switcher type FCL possesses following advantages： the voltage drop across the FCL is very low under its normal operation, so there is almost no affect on transmission line; when transmission line fault occurs the current-limiting inductance can be automatically inserted into faulty line; this type of FCL basically does not generate harmonics, its control is flexible, simple and reliable as well as the short-circuit current of transmission line can be limited swiftly and effectively.