基于二阶带通滤波器的单相锁相环技术研究  

Research on Single-phase Phase Locked Loop Technology Based on Second-order Bandpass Filter

作　　者：荆世博 辛超山 薛静杰 张增强 Jing Shibo;Xin Chaoshan;Xue Jingjie;Zhang Zengqiang(State Grid Xinjiang Economic Research Institute,Urumqi 830000,Xinjiang,China;State Grid Xinjiang Comprehensive Energy Service Company,Urumqi 830000,Xinjiang,China)

机构地区：[1]国网新疆电力有限公司经济技术经研院,新疆乌鲁木齐830000 [2]国网新疆电力有限公司综合能源服务公司,新疆乌鲁木齐830000

出　　处：《四川电力技术》2021年第2期54-57,69,共5页Sichuan Electric Power Technology

摘　　要：并网系统中,由于存在大量电力电子器件,导致并网逆变器输出的电压中存在直流分量和高频谐波,传统锁相环的环路滤波器难以完全滤除输入信号的谐波,将在锁相环输出信号中产生相位偏移。针对这一现象,首先,构造了一个二阶带通滤波器(Biquad filter,BF)来有效抑制输入电压信号中直流分量和高频谐波,锁相环中的正交信号通过构造二阶广义积分器(SOGI)来获得;然后,对二阶带通滤波器特性进行分析,设计了双二阶带通滤波器参数;最后,通过Matlab/Simulink软件对包含直流分量、高频分量、畸变、跳变等情况的电压信号进行仿真。仿真结果表明,基于二阶带通滤波器的锁相环能够很好抑制直流分量和高频分量,有效消除因参数设置不合理产生的相位偏移。In the grid-connected system,due to the existence of a large number of power electronic devices,there are DC components and high-frequency components in voltage output by the grid-connected inverter.The loop filter of the traditional phase-locked loop is difficult to completely filter the harmonics of input signal,and a phase shift occurs in output signal of the phase-locked loop.In response to this phenomenon,a second-order bandpass filter is constructed to effectively suppress the DC component and high-frequency harmonics in input voltage signal.The quadrature signal in the phase-locked loop is obtained by constructing a second-order generalized integrator(SOGI).The characteristics of second-order bandpass filter are analyzed,and its parameters are designed.Finally,through the Matlab/Simulink software,the simulation for the conditions including DC components,high-frequency components,distortion,jumps etc.are carried out.The simulation results show that the phase-locked loop based on second-order bandpass filter can well suppress the DC component and high-frequency component,and effectively eliminate the phase shift caused by unreasonable parameter settings.

关 键 词：二阶滤波 直流分量 高频分量 相位偏移 

分 类 号：TM743[电气工程—电力系统及自动化]