改进的无锁相环无低通滤波器的谐波检测方法

谐波检测精度和实时性直接影响APF的补偿性能。本文在传统d-q谐波电流检测算法基础上进行了改进,针对锁相环易受电网波动影响的缺陷,采用基于正序基波提取器的d-q检测方法;针对低通滤波器滤波效果与响应速度难以兼顾的问题,采用基于直流分量的d-q检测方法;结合以上两种方法的优点,得出一种无锁相环无低通滤波器的d-q检测方法。仿真和实验结果表明,改进的d-q法能较准确地检测出补偿电流信号,且动态响应快,算法实现简单。

Improved Harmonic Detection Method without PLL and LPF

Harmonic detection accuracy and real-time directly affect the performance of the APF compensation.This paper carried out improvement based on traditional d-q harmonic current detection algorithm,used the d-q method based on positive sequence fundamental extractor for the problem of the phase-locked loop(PLL);used the d-q method based on the DC component for the low-pass filter(LPF) problem.Thus combining these two methods’ advantages,it proposed d-q method without PLL and LPF.Simulation and experimentation show that the improved d-q method can precise detect the compensation current signal.