一种改进的双级光伏并网逆变器反推控制方法  

An Improved Back-stepping Control Method for Two-stage Photovoltaic Grid Connected Inverter

作　　者：宁平华[1] 吴彩林[1] 潘小波[1] 缸明义[1] 刘娟[1] 夏兴国[1] NING Ping-hua;WU Cai-lin;PAN Xiao-bo;GANG Ming-yi;LIU Juan;XIA Xing-guo(Department of Electrical Engineering,Maanshan Technical College,Maanshan 243031,China)

机构地区：[1]马鞍山职业技术学院电气工程系,安徽马鞍山243031

出　　处：《辽东学院学报（自然科学版）》2022年第2期100-107,共8页Journal of Eastern Liaoning University:Natural Science Edition

基　　金：安徽省高校省级自然科学研究重点项目(KJ2019A1244、KJ2019A1245、KJ2020A0928);安徽省高校优秀青年人才支持计划项目(gxyq2019202)。

摘　　要：在局部阴影等复杂工况下,常规双级式光伏并网逆变器控制方法易导致系统工作在局部峰值点、稳定性差、谐波含量高等问题。针对上述问题,提出一种电压功率扫描算法优化反推控制的设计方案。该方案在α-β静止坐标系下建立有功无功解耦的三相并网逆变系统数学模型,在此基础上进行逆变器反推控制器设计,用电压功率扫描算法对反推控制在MPPT方面的不足进行在线辨识和优化,用Liyapunov稳定性理论证明该控制器的稳定性。结果表明,该方案能很好地实现最大功率追踪及并网功能,具有良好的稳定性与鲁棒性。Under complex working conditions such as local shadow,the control method of conventional two-stage photovoltaic grid connected inverter is easy to lead to problems such as local peak point,poor stability and high harmonic content.To solve the above problems,a design scheme of optimal back-stepping control based on voltage power scanning algorithm is proposed.First of all,in this schemeα-βThe mathematical model of three-phase grid connected inverter system with active and reactive power decoupling is established in static coordinate system.On this basis,the inverter back-stepping controller is designed,and then the shortcomings of back-stepping control in maximum power point tracking(MPPT)are identified and optimized online by using voltage power scanning algorithm(VPSA).The stability of the controller is proved by Liyapunov stability theory.The results show that the scheme can achieve the maximum power tracking and grid connected function well,and has good stability and robustness.

关 键 词：双级光伏逆变器 反推控制 电压功率扫描算法 MPPT 鲁棒性 

分 类 号：TM615[电气工程—电力系统及自动化]