串联补偿型限流器对10kV配电系统的影响研究

Influence of Fault Current Limiter with Series Compensation on 10 kV Distribution Network

文中围绕10 k V配电网系统,主要研究了一种串联补偿型故障限流器对电力系统的影响,该限流器由主回路串联的电容电感、与电容并联的金属氧化物避雷器、阻尼回路、反并联晶闸管以及旁路开关组成。文中首先介绍了其拓扑图和工作原理,接着理论分析了该限流器对单机无穷大系统的影响,然后在建立的仿真模型的基础上,分别研究了在正常工作状态下以及短路状态下限流器对系统的影响。通过理论分析和MATLAB/Simulink对系统进行仿真,研究表明该限流器在正常工作时可以改善电能质量,提高线路传输能力;在短路故障时能够起到限制短路电流的作用,提高暂态稳定性。

A fault current limiter with series compensation is presented for 10 kV distribution network system.It is composed of a capacitor and an inductance in series with main circuit,some metal oxide surge arresters in parallel with the capacitor,a damping loop,some anti-parallel thyristors,and a bypass switch.The topology and working principle of the fault current limiter are described,and its influence on single machine infinite system is analyzed theoretically.A simplified 10 kV distribution network model is established to investigate the influence of the fault current limiter on the power system＇s transient stability via MATLAB/Simulink.Theoretical and simulation results show that the fault current limiter can improve the power quality and the capacity of transmission line in normal state,and it can limit short-circuit current to improve the transient stability of the power system in the case of short circuit.