并网功率变换器的电网电压同步算法  

Grid voltage synchronization algorithms for grid-connected power converters

作　　者：文武松[1,2] 张颖超[2] 王璐[3] 赵争鸣[1] 聂金铜[1,2] WEN Wusong ZHANG Yingchao WANG Lu ZHAO Zhengming NIE Jintong(Department of Electrical Engineering, Tsinghua University, Beijing 100084, China Department of Power Engineering, Chongqing Communication Institute, Chongqing 400035, China Department of Mathematics and Information Engineering, Chongqing University of Education, Chongqing 400067, China)

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084 [2]重庆通信学院电力工程系,重庆400035 [3]重庆第二师范学院数学与信息工程系,重庆400067

出　　处：《清华大学学报（自然科学版）》2017年第6期637-643,共7页Journal of Tsinghua University(Science and Technology)

基　　金：重庆市科技攻关项目(CSTC2012gg-yyjs90014);重庆市教委应用基础研究项目(KJ1501406)

摘　　要：快速准确获取电网电压幅值、频率和相位信息,是确保各种并网功率变换器的稳态、动态性能的关键。通过对电网电压同步算法进行分类,综述已有典型锁相环算法,指出其应用过程中存在的频率波动、谐波和三相不平衡、直流偏置以及相角突跳变等突出问题,并给出了相应的抑制方法。结果表明:基于同步参考坐标系和谐振控制器的锁相环是目前2种主流的电压同步方法;采用多通道解耦能有效抑制谐波和频率波动,单相系统可等效成三相系统处理;同时,电网电压同步技术正在向着准确性高、响应速度快、鲁棒性强的方向发展。An accurate and fast detection of the amplitude, frequency and phase angle of the grid voltage is crucial to assure the steady-state and dynamic performance of grid-connected power converters. This paper describes the classification of grid voltage synchronization algorithms, the principles and characteristics of phase-locked-loop （PLL） controllers, and the serious problems of PLL controllers such as frequency variations, unbalanced and distortied conditions, direct-current （DC） bias and phase-angle jumps with suppression methods to reduce these effects. The results show that PLL controllers based on synchronous reference frames or resonant controller are now widely used to track the grid voltage with multichannel-decoupling to suppress the harmonics and frequency fluctuations. A single-phase controller can be equivalent to a three-phase controller with new synchronization systems being more accurate, fast and robust.

关 键 词：锁相环 频率自适应 谐波抑制 直流偏置 相角突变 

分 类 号：TM935.23[电气工程—电力电子与电力传动]