一种改进的谐波电流检测方法

An improved method of harmonic current detection

针对传统的ip-iq谐波电流检测方法采用锁相环虽然能得到三相电流的基频和初相角,但当电网电压发生畸变时则存在检测精度较低、电路复杂的问题,提出了一种改进的无锁相环的谐波电流检测方法;详细分析了当电网电压发生畸变时,在三相电流对称和不对称的情况下该改进方法的检测原理,并给出了该改进方法应用于单相电路谐波电流检测的实现。实验结果表明,该改进方法能够准确、实时地检测谐波电流,且算法简单。

In view of problems that traditional ip-iq harmonic current detection method can get fundamental frequency and initial phase angle of three-phase current by using PLL,but the method has low detection precision and complex circuit when power voltage occurs distortion,the paper proposed an improved method of harmonic current detection without PLL.It detailedly analyzed detection principle of the improved method under conditions of symmetric and asymmetric three-phase current when power voltage occurred distortion,and gave implementation of the improved method applied in harmonic current detection of single-circuit.The experiment results show that the improved method can detect harmonic current accurately and real-timely and has simple algorithm.