一种改进型二阶广义积分锁相环研究

Research on an Improved Phase Locked Loop of Second-order Gerneral Integrator

在锁相环(PLL)中直流分量的存在,会导致检测结果中相位和频率出现基频振荡。由于其频率较低,消除直流分量是一个很具有挑战的任务。针对采用二阶广义积分器(SOGI)构建正交信号发生器(QSG)时会带来较大谐波,提出改进的SOGI方法,即增加一个积分环节,在不影响其他部分功能的前提下,将直流分量提取出来,并对其结构性能及参数设计进行了分析设计,最后仿真和实验结果证明了所提方法的正确性和有效性。

The presence of the DC component in the phase-locked loop（PLL） input results in fundamental frequency oscillations in the phase and frequency estimated by the PLL.The removal of these oscillations is a challenging task be- cause of their low frequency.The quasi signal generator（QSG） construct by second-order general integrator（SOGI） result in harmonics.The improved SOGI crossover cancellation method is proposed,which adds an integral part.Without affecting the function of other parts, the DC component is extracted.The structural performance and parameter design is analyzed.The simulation and experimental results show the correctness and effectiveness of the proposed method.