新型饱和铁心型高温超导故障限流器等效电路和仿真分析

基于饱和铁心型高温超导故障限流器的基本工作原理,提出了一种新型高温超导故障限流器的铁心结构和交直流线圈配置方式。通过理论分析,介绍了新型结构的工作原理,建立其等效二端口电路模型,推导出电路模型的参数,分析了交流绕组在直流回路中产生的感应电流大小。结构限流器通过缩减偏置磁路的有效长度,降低偏置电流的大小。对新型高温超导故障限流器进行仿真分析,仿真结果表明,在系统正常运行时,结构限流器对交流回路电流的影响很小,在系统发生短路故障时,能够有效、快速地将短路电流限制在合理范围内。

Equivalent Circuit and Simulation Analysis of a Novel Saturated Iron-core HTSFCL

In the basic operating principle of saturated iron-core high temperature superconductive fault current limiter (HTSFCL),this paper presents a novel core structure and AC-DC coil geometry of saturated iron-core HTSFCL.Through theoretical analysis,it introduces the working principle of the new structure,establishes its equivalent two-port circuit model,deduces parameters for the circuit model,and analyzes the amount of induction current generated by the AC winding in the DC circuit.By reducing effective length of the magnetic bias circuit,the current limiter can reduce the amount of the bias current.Simulation analysis is made of the novel HTSFCL.Simulation results show that the current limiter produces little impact on the current of the AC circuit during normal system operation,and can quickly and effectively limit short-circuit current to a reasonable range in case of short circuit of the system.