针对直流偏移和谐波畸变的新型并网锁相环设计  

New Grid-connected Phase-locked Loop Design under DC Offset and Harmonic Distortion

作　　者：杨俊杰 王宾[1] 程军辉[1] YANG Jun-jie;WANG Bing;CHENG Jun-hui(College of Electrical and Information Engincering,Anhui University of Science and Technology,Huainan 23200,Anhui,China)

机构地区：[1]安徽理工大学电气与信息工程学院,安徽淮南232001

出　　处：《兰州文理学院学报(自然科学版)》2025年第1期72-77,共6页Journal of Lanzhou University of Arts and Science(Natural Sciences)

基　　金：安徽省高校优秀青年人才支持计划(gxyq2022064)。

摘　　要：同步参考坐标系锁相环(SRF-PLL)作为最广泛的电网同步技术,当存在电网不平衡、谐波畸变及直流偏移等非理想状态时,其表现不佳.为了提升SRF-PLL的滤波能力,本文采用传统双二阶广义积分器(DSOGI)提取与分离电压正负序分量.通过改进多变量滤波器(MVF)解决DSOGI无法消除直流偏移的问题,并且保留了MVF对输入电压基波正序分量不会产生电压幅值变化和相移的特性.将改进的MVF结构引入DSOGI中,设计一种新型锁相环,能有效提升滤除谐波分量的能力.进行Matlab/Simulink仿真,结果表明该锁相环在电压不平衡、直流偏移、谐波畸变和频率突变下能够快速锁相.The Synchronous Reference Frame Phase-Locked Loop(SRF-PLL)is the most widely used grid synchronization technology.However,it does not perform well when there are non-ideal conditions such as grid imbalance,harmonic distortion,and DC offset.In order to improve the filtering ability of SRF-PLL,a traditional second-order generalized integrator(DSOGI)is used to extract and separate the positive and negative sequence components of the voltage.The effect of dc offset cannot be eliminated by improving the multivariable filter(MVF),and the MVF is retained that the positive sequence component of the input voltage fundamental does not produce voltage amplitude changes and phase shifts.By introducing the improved MVF structure into DSOGI,a new PLL is designed,which can effectively improve the ability to filter out harmonic components.Finally,Matlab/Simulink simulation is carried out,and the simulation results show that the PLL can quickly lock in under voltage imbalance,DC offset,harmonic distortion and frequency mutation.

关 键 词：锁相环 二阶广义积分器 多变量滤波器 电压不平衡 谐波畸变 

分 类 号：TM464[电气工程—电器]