一种改进的方均根值谐波检测方法的研究

摘要

针对传统检测方法不能有效应用于电网畸变和频率波动的缺陷,提出了一种改进的无锁相环的方均根值谐波检测方法.该方法采用基波正序提取环节代替锁相环,得到与基波电压正序分量同步的信号,进而检测谐波分量.将其与传统ip?iq检测法相比,该方法响应速度快,且可以有效地工作在电网恶劣的情况下.仿真和实验结果表明,将其应用于APF的谐波检测环节,电网侧谐波的补偿达到了预期的效果.%Aiming at the deficiencies of traditional detection methods under distorted power grid voltage and fluctuant frequency, an improved Root-Mean-Square (RMS) harmonic detection method without Phase Locked Loop (PLL) is proposed. This method uses the fundamental positive sequence extraction segments instead of phase locked loop, so as to obtain the signals synchronized with the fundamental positive sequence component and then detect the harmonic component.Compared with the traditional ip?iqdetection method,this method can be used effectively at severe condition of power grid with fast response speed. Simulation and experimental results verify that the compensation of power grid side harmonic can achieve the desired results when the method is used in the active power filter.