基于扩张状态观测器和滑模控制的光伏并网逆变器控制策略研究  

Research on the control strategy of photovoltaic grid-connected inverter based on extended state observer and sliding mode control

作　　者：唐杰[1] 唐杰[1] 邵武 唐婷婷 TANG Jie;TANG Jie;SHAO Wu;TANG Tingting(Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-Power Sources Area, Shaoyang University, Shaoyang 422000, China;School of Electrical and Information Engineering, Hunan University, Changsha 410000, China;Hunan Institute of Communications Engineering, Hengyang 421200, China)

机构地区：[1]邵阳学院多电源地区电网运行与控制湖南省重点实验室,湖南邵阳422000 [2]湖南大学电气与信息工程学院,湖南长沙410000 [3]湖南交通工程学院机电工程学院,湖南衡阳421200

出　　处：《邵阳学院学报(自然科学版)》2022年第2期28-37,共10页Journal of Shaoyang University:Natural Science Edition

基　　金：湖南省教育厅重点项目(19A447)。

摘　　要：针对光伏发电并网系统中电网电压不平衡条件下直流侧电压波动问题,提出一种基于扩张状态观测器和滑模控制的直流电压控制策略,通过仿真和实验进行验证并设计扩张状态观测器对系统扰动进行实时估计和动态补偿,采用滑模控制提高系统的动态响应性能,该控制策略能有效提高并网逆变器直流电压的稳定性以及动态响应性能。与传统控制策略相比,所提出的控制策略在保障并网逆变器直流侧电压稳定性的同时,改善其动态响应性能,提高了光伏发电并网系统在电网电压不平衡条件下的运行能力。Aiming at the problem of DC side voltage fluctuation at unbalanced grid voltage in photovoltaic power generation grid-connected system,a DC voltage control strategy based on the combination of extended state observer and sliding mode is proposed.Verified by simulation and experiment the extended state observer is designed to estimate and compensate the system disturbance in real-time.Sliding mode control is used to improve the dynamic response performance of the system.This control strategy can effectively improve the DC voltage stability and dynamic response performance of the grid-connected inverter.Compared with the traditional control strategy,the control strategy proposed in this study not only guarantees the voltage stability of the DC side of the grid-connected inverter,but also improves its dynamic response performance and improves the operation of the photovoltaic power generation grid-connected system at unbalanced grid voltage ability.

关 键 词：光伏发电系统 电网电压不平衡 并网逆变器 直流电压控制 

分 类 号：TM711[电气工程—电力系统及自动化]