零相位滑动平均滤波器锁相环在LCL型逆变器中的应用  

Application of Zero Phase Moving Average Filter in LCL Inverter

作　　者：周立[1] 刘一鸣 刘金澍 李京明 ZHOU Li;LIU Yiming;LIU Jinshu;LI Jingming(Faculty of Electrical and Control Engineering,Liaoning Technical University,Huludao 125105)

机构地区：[1]辽宁工程技术大学电气与控制工程学院,葫芦岛125105

出　　处：《电气工程学报》2023年第1期68-76,85,共10页Journal of Electrical Engineering

基　　金：国家自然科学基金资助项目(51177067)。

摘　　要：在并网控制过程中,锁相技术是并网逆变器与电网同步的关键,提出以二阶广义积分(Second-order generalized integrator,SOGI)和滑动平均滤波算法(Movingaveragefilter,MAF)为基础的零相位滑动平均滤波器二阶广义积分锁相环(Zero-phase moving average filter-second-order generalized integrator-phase-locked loop,ZPMAF-SOGI-PLL)。通过改进SOGI结构和MAF算法得到ZPMAF-SOGI-PLL,在并网逆变器控制的环节中使用了ZPMAF-SOGI-PLL方法进行锁相,进而使锁相环在不理想情况下能快速、稳定、准确地从电网中获取电压正负序分量、频率、相位等参数,并通过现代控制理论分析了该方法的稳定性。通过电网电压不平衡和含有高次谐波工况下的仿真和试验结果表明,所提方法可使LCL并网逆变器准确检测正负序分量,且并网电流的谐波含量在两种具体的工况下分别降低到1.89%和2.71%,使LCL型并网逆变器运行更稳定。In the process of grid-connected control,phase-locked technology is the key to the synchronization of grid-connected inverter and power grid.A zero-phase moving average filter second-order generalized integrator phase locked loop(ZPMAF-SOGI-PLL)based on second-order generalized integrator(SOGI)and moving average filter algorithm(MAF)is proposed.By improving the SOGI structure and MAF algorithm,it can be solved that the phase-locked loop can quickly,stably and accurately obtain the positive and negative sequence component voltage,frequency,phase and other parameters from the power grid under unsatisfactory conditions.The stability of this method is analyzed by modern control theory,and the SOGI-PLL method is used for phase locking in the link of grid-connected inverter control.The simulation and experimental results under unbalanced grid voltage and high-order harmonic conditions show that the proposed method enables the LCL grid-connected inverter to accurately detect the positive and negative sequence components,so that the harmonic content of the grid-connected current is reduced to 1.89%and 2.71%under the two conditions,respectively,and the operation of the LCL grid-connected inverter is more stable.

关 键 词：LCL型并网逆变器 二阶广义积分器 锁相环 零相位滑动平均滤波 

分 类 号：TM464[电气工程—电器]