基于交叉解耦双复系数滤波器的频率自适应锁相环  

Frequency Adaptive Phase-locked Loop Based on Crossing-Decoupling Double Complex Coefficient Filter

作　　者：王佳浩 潘欢 纳春宁 WANG Jiahao;PAN Huan;NA Chunning(School of Physics and Electronic-Electrical Engineering,Ningxia University,Yinchuan 750021,China;Ningxia Key Laboratory of Electrical Energy Security,Yinchuan 750004,China)

机构地区：[1]宁夏大学物理与电子电气工程学院,银川750021 [2]宁夏电力能源安全重点实验室,银川750004

出　　处：《电力系统及其自动化学报》2021年第3期25-31,共7页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(61763040);宁夏自治区重点研发计划资助项目(引才专项2018BEB04003);第三批宁夏青年科技人才托举工程资助项目(TJGC2018095)。

摘　　要：锁相环PLL(phase-locked loop)是控制逆变器实现并网同步的重要方法之一。针对准1型锁相环QT1-PLL(quasi-Type-1 PLL)在电网电压频率偏移时抗干扰能力不佳、导致检测频率和相位误差较大的问题,本文提出一种新型的基于交叉解耦双复系数滤波器DCCF(double complex coefficient filter)的QT1-PLL(DCCF-QT1-PLL)。将具有频率反馈回路的交叉解耦DCCF作为QT1-PLL的前置滤波环节;采用窗长为0.0033 s的滑动平均滤波器MAF(moving average filter)作为DCCF-QT1-PLL的环内滤波环节;进而建立了DCCF-QT1-PLL的小信号模型,通过该模型得到了设计参数。提出的DCCF-QT1-PLL结构可消除电压不平衡和谐波分量,实现频率自适应。在Matlab/Simulink平台中搭建仿真模型,仿真结果证实DCCF-QT1-PLL结构具有频率自适应和更强的滤波能力。Phase-looked loop(PLL)is one of the important methods to control an inverter and achieve grid-connected synchronization.Considering that the quasi-Type-1 PLL(QT1-PLL)has a poor anti-disturbance capability under fre⁃quency offset of grid voltage,which leads to large errors in detected frequency and phase estimation,a novel crossingdecoupling double complex coefficient filter(DCCF)-based QT1-PLL(DCCF-QT1-PLL)is proposed in this paper.A crossing-decoupling DCCF with frequency feedback loop is used as the pre-filtering stage of QT1-PLL,and a moving av⁃erage filter(MAF)with 0.0033 s window length is used as the in-loop filtering stage of DCCF-QT1-PLL.As a result,a small-signal model of DCCF-QT1-PLL is established,and its design parameters are obtained.The structure of the pro⁃posed DCCF-QT1-PLL can eliminate the grid voltage imbalance and harmonic component,thereby achieving frequency adaptation.A simulation model is built in the Matlab/Simulink platform,and simulation results show that the structure of DCCF-QT1-PLL has capabilities of frequency adaptation and stronger filtering.

关 键 词：准1型锁相环 复系数滤波器 滑动平均滤波器 电网电压不平衡 谐波畸变 

分 类 号：TM761[电气工程—电力系统及自动化]