三相四线制不平衡负载系统无功及谐波电流检测

Reactive and Harmonic Current Detection Method of Three-Phase Four-Line Unbalance Load System

为解决三相四线制低压供电系统中非线性负载形成的无功电流和谐波电流对电网的影响,对三线四线制负载系统的电路特点、瞬时无功电流、谐波电流进行详细理论分析,确定了三相四线制不平衡非线性电路负载端无功电流和谐波电流的补偿办法,并提出了谐波电流和无功电流的电流倍压测定法,给出了检测原理图。仿真结果证明,该方法简单可靠、实时性好、检测精度高。

To eliminate the effect of reactive and harmonic current induced by nonlinear load on electric network in three-phase four-line low-voltage system, which load system＇ s circuit features, instantaneous reactive and harmonic current were analyzed theoretically in detail, compensation method to reactive current and harmonic current of unbalance three-phase four-line nonlinear circuit load terminal was determined, reactive and harmonic current double-voltage detection method was proposed, and principle diagram was given. The results show that the method has features such as simple and reliable algorithm, good real-time performance, high detection accuracy.