弱电网环境下光伏并网逆变器锁相环研究  

Research on Phase-locked Loop of Photovoltaic Grid-connection Inverter in Weak Grid

作　　者：李生民[1,2] 肖亚敏 梁吉宁 孟琳 LI Sheng-min;XIAO Ya-min;LIANG Ji-ning;MENG Lin(Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048 [2]陕西省复杂系统控制与智能信息处理重点实验室,陕西西安710048

出　　处：《电力电子技术》2019年第7期95-97,共3页Power Electronics

基　　金：国家自然科学基金(51177056)~~

摘　　要：双二阶广义积分器(DSOGI)可以在电网电压不平衡情况下精确提取电网电压锁相角,但在谐波含量较多的环境下,由于DSOGI对频率的依赖性较强,会导致锁相误差较大,系统不稳定。此处对DSOGI-锁相环(PLL)进行了改进,利用谐波消除模块(HCM)消除电网电压中的谐波分量,有效地降低了谐波对输出相角的影响。仿真和实验结果表明:改进后的PLL能够有效减小弱电网环境下的锁相误差。Dual second-order generalized interger(DSOGI)can accurately extract the grid voltage phase-locked angle in the case of grid voltage imbalance.However,in the environment with high harmonic,due to the dependence of the DSOGI on the frequency which leads to large phase-locked error and unstable system.DSOGI-phase-locked loop(PLL)is improved.The harmonic cancellation module(HCM)is used to eliminate the harmonic components in the grid voltage which effectively reduces the influence of harmonics on the output phase angle.Simulation and experimental results show that the improved PLL can effectively reduce the phase-locking error in the weak grid environment.

关 键 词：双二阶广义积分器 谐波消除模块 锁相环 

分 类 号：TP321.2[自动化与计算机技术—计算机系统结构]