基于改进SOGI-QSG的频率自适应锁相环  

Frequency Adaptive Phase Locked Loop Based on Improved SOGI-QSG

作　　者：吴振鑫 常国祥 WU Zhenxin;CHANG Guoxiang(School of Electrical and Control Engineering,Heilongjiang University of Science and Technology,Harbin 150022,Heilongjiang Province,China)

机构地区：[1]黑龙江科技大学电气与控制工程学院,黑龙江哈尔滨150022

出　　处：《分布式能源》2020年第6期60-67,共8页Distributed Energy

摘　　要：针对双二阶广义积分锁相环(dual second-order generalized integrator phase locked loop,DSOGI-PLL)在不平衡电网下锁相效果不理想的问题,提出了一种改进二阶广义积分正交信号发生器(second-order generalized integrator quadrature signal generator,SOGI-QSG)的频率自适应锁相环,来提高并网电流在不平衡电网下的并网质量。改进SOGI-QSG能够很好地滤除直流分量,同时加入了频率自适应功能,再通过级联谐振滤波器来消除奇次谐波对并网的影响,最后对q轴的正序分量进行锁相。在Simulink中对基于改进SOGI-QSG的频率自适应锁相环进行了仿真,结果表明:在电网电压单相跌落或频率出现微小波动时,基于改进SOGI-QSG的频率自适应锁相环比DSOGI-PLL有更好的锁相效果。Based on dual second-order generalized integrator phase locked loop(DSOGI-PLL),the effect of phase-locked in unbalanced power system is not ideal.In this paper,an improved frequency adaptive phase-locked loop of SOGI-QSG(second order generalized integral quadrature signal generator)is proposed to improve the quality of grid connected current in unbalanced power grid.The improved SOGI-QSG can filter the DC component well,and add the frequency self-adaptive function,and then through the cascaded resonance filter to eliminate the influence of odd harmonics on the grid connection.Finally,the positive sequence component of q-axis is locked.In Simulink,the frequency adaptive PLL based on the improved SOGI-QSG is simulated.The results show that the frequency adaptive PLL based on the improved SOGI-QSG is better than DSOGI-PLL in the case of single-phase voltage drop or small frequency fluctuation.

关 键 词：改进二阶广义积分正交信号发生器(SOGI-QSG) 频率自适应 级联谐振滤波器 奇次谐波 直流分量 

分 类 号：TM464[电气工程—电器]