三相不对称系统中谐波电流检测的新方法

提出了一种基于调整ip-iq算法的谐波检测方法。该方法不仅适用于负载不对称系统,而且适用于电源电压不对称系统。在检测过程中,它无需采用锁相环(PLL)电路获得同步旋转角,即使在三相电压不对称或者畸变时,也无需对电压进行锁相、滤波或者对称分解,整个算法的基准矢量相位是由数字检测系统自身精确给定的,从而消除了PLL和滤波器延时带来的影响,减小了检测误差,能准确检测出电流无功、负序和谐波分量。仿真分析和实验结果证明了所提方法的有效性。

New Method of Harmonic Currents Detection for Unbalanced Power System

This paper presents a new harmonic currents detection method based on modified arithmetic.This method is suitable for the unbalanced AC system and don't need PLL circuit to obtain synchronous rotate angle.Even though the voltage of power networks is unbalanced and distorted,it can works without phase locking,filtering and symmetrical de-composition to the voltage beforehand.The phase of the benchmark vector of the arithmetic is given by the digital detection system itself precisely.Therefore,the time delay caused by PLL and the filter is avoided and the error is reduced.Negative sequence current,reactive power and harmonic components can be detected precisely.The simulation analysis and the ex-perimental results indicate that the method proposed is effective.