10 kV配电网短路电流限流措施对比分析

Comparison and Analysis on Current Limiting Measures of Short Circuit Current in 10 kV Distribution Network

针对配电网短路电流对系统安全稳定运行的影响,本文主要对含分布式光伏电源和感应电动机的配电网限流措施进行研究。考虑分布式光伏电源和感应电动机负荷,研究了加装普通串联电抗器、理想故障限流器、串联谐振型固态限流器和磁通约束型限流器对10 kV配电网的限流效果,并通过搭建Matlab/Simulink仿真模型,对IEEE 33节点系统进行仿真分析。仿真结果表明,限流装置中的电感值越大,限流效果越好;普通串联电抗器对于稳态电压和电流有一定的影响,而其余3种限流装置对稳态电压和电流无影响。该研究对电网短路故障分析具有理论研究价值和现实意义。

In view of the influence of short-circuit current on the safety and stability of distribution system,this paper mainly studies the current limiting measures of distribution network including distributed PV sources and induction motors.The current limiting effects of ordinary series reactor,ideal fault current limiter,series resonant solid-state current limiter and flux-constrained current limiter on 10 kV distributed network are studied considering distributed PV and induction motors.And case studies are carried out on IEEE 33 nodes system through the establishment of Matlab/Simulink simulation model.The simulation results demonstrate that the bigger the inductance is,the better the current limiting effect is.The ordinary series reactor affects voltage and current in steady state and the others do not.The study has theoretical research value and practical significance for short-circuit fault analysis of power grid.