一种可适应复杂网压条件的快速锁相环  

A fast PLL which can adapt to complex grid voltage conditions

作　　者：陈晓彤 孙正 罗利文[1] Chen Xiaotong;Sun Zheng;Luo Liwen(School of Electronic Information and Electrical Engineering,Shanghai Jiaotong University,Shanghai 200240,China;SAIC Motor Corporation Limited,Shanghai 200041,China)

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240 [2]上海汽车集团股份有限公司,上海200041

出　　处：《电子技术应用》2022年第12期74-78,共5页Application of Electronic Technique

摘　　要：基于双二阶广义积分器的锁相环(DSOGI-PLL)被广泛应用于逆变器实现同步并网。但是,当电网电压三相不平衡或存在谐波分量和直流偏移,即网压条件较为复杂时,滤波效果不理想,对输入信号的检测出现波动。因此,提出一种改进的二阶广义积分器结构,在分离正负序电压的基础上加入直流分量抑制模块,滤除直流电压,并在锁相环加入低通滤波器,从而提高锁相环抑制谐波电压和直流电压的能力,准确提取电网电压同步信号。在MATLAB/Simulink进行仿真研究,实验结果表明,该锁相环在电网电压存在多次谐波和直流电压时能够滤除谐波分量和直流分量,锁频锁相效果较好。Phase-locked loop(PLL)based on dual second-order generalized integrator(DSOGI-PLL)is widely used in inverter synchronous grid-connection.However,when the power grid voltage is unbalanced or harmonic components and DC offset exists,namely,when the grid voltage condition is complex,DSOGI-PLL has a large deviation from the frequency.Therefore,an improved structure is proposed.The DC component suppression module is added to filter the DC voltage,and the low-pass filter is added to improve the ability of the PLL to suppress harmonic voltage,and accurately extract the grid voltage synchronization signal.The simulation results in MATLAB/Simulink verify that the PLL can filter out the harmonic component and DC component,and the effect is better.

关 键 词：二阶广义积分器 锁相环 谐波 直流偏移 电压不对称 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置] TM464[自动化与计算机技术—控制科学与工程]