基于改进SOGI-PLL电网基波正序分量同步方法  

A Fundamental Positive Sequence Component Synchronization Method for Grid Voltage Based on the Phase Locked Loop with Improved Second-order Generalized Integrators

作　　者：唐爱博 王安娜[1] 宋崇辉[1] TANG Ai-bo;WANG An-na;SONG Chong-hui(College of Information Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110819

出　　处：《控制工程》2021年第6期1136-1142,共7页Control Engineering of China

基　　金：国家自然科学基金资助项目(61773006)。

摘　　要：为了满足电网故障情况下并网逆变器的控制要求,并针对传统基波正序电压分量同步方法响应速度较慢和滤波性能较差的问题,提出了一种基于改进二阶广义积分器锁相环(SOGI-PLL)的电网基波正序分量同步方法。首先将改进的具有直流偏移消除的SOGI结构加入单同步坐标系锁相环中,利用SOGI输出信号相互正交的性质来消除负序分量对锁相结果的影响;然后通过级联滤波模块来消除谐波分量对锁相结果的影响,通过频率自适应结构和相位补偿来抑制电网频率和相位偏移的影响,实现故障工况下电网基波正序电压分量的快速准确跟踪;最后利用仿真和实验平台验证了所提方法的正确性和有效性。In order to meet the control requirements of the grid inverters under the condition of unbalanced grid voltage, and aiming at solving the problems of the slow response and poor filtering performance of the traditional positive sequence synchronization method for grid voltage, a fundamental positive sequence synchronization method based on improved second-order generalized integrator phase-locked loop(SOGI-PLL) is proposed in this paper. Firstly, the improved SOGI structure with direct current(DC) offset elimination is added to the phase-locked loop in single-synchronous coordinate system, and the orthogonality of the SOGI output signals is introduced to erase the effects of negative sequence components on the phase-locking results. Then, the effects of the harmonic signals is suppressed by adding a preposed cascaded filtering module, and the effects of the phase and frequency offset is eliminated by adding ferquency adaptive and phase compensation structure, thus achieving the fast and accurate tracking of the fundamental positive sequence component of the grid under fault conditions. Finally, the experimental platform is used to conduct the simulating experiments and the results show the correctness and effectiveness of the proposed method.

关 键 词：同步信号 二阶广义积分器 锁相环 级联滤波 

分 类 号：TM71[电气工程—电力系统及自动化]