基于DSOGI-PLL的指定次谐波检测研究

针对三相电压不平衡、谐波或畸变条件下,传统锁相环不能获取准确的基波正序电压相位,提出了一种基于双二阶广义积分器锁相环(DSOGI-PLL)方法.该方法通过构造二阶广义积分器(SOGI)的90°移相系统来实现正负序分离,从而达到准确获取相位的目的.经理论分析,然后通过Simulink仿真且与传统锁相环对比的方法从而验证该锁相环方法的准确性和有效性.并将此锁相环应用于指定次谐波检测,通过多组不同旋转频率的同步d-q变换及相应反变换将指定次谐波快速准确的分离出来.

Research on selective harmonic detecting method based DSOGI PLL

For three-phase voltage unbalance,harmonic distortion or under the condition of the traditional PLL can not obtain the fundamental positive sequence voltage phase accurately The traditional PLL cannot obtain the fundamental positive sequence voltage phase accurately when three-phase voltage is unbalance or distorted.This paper presents a method based on double second order generalized integrator phase locked loop (DSOGI-PLL).This method construct a 90° phase-shifting system of second order generalized integrator (SOGI) to separate positive and negative sequence,so as to obtain the accurate phase.The accuracy and effectiveness of this PLL method is verified by Theoretic analysis,Simulink simulate result and comparison with traditional PLL method.Then apply this PLL method to detect of selected harmonics,Through d-qsynchronized transform and corresponding inverse transform of multiple difference rotation frequency to separate the selected harmonics.