三相四桥臂并网逆变器重复控制积分抗饱和策略  

Anti-Windup Strategy of Repetitive Controller for Three-Phase Four-Leg Grid-Tied Inverter

作　　者：谭翠兰[1,2] 邢彦一 陈启宏[1] 张立炎[1] Tan Cuilan;Xing Yanyi;Chen Qihong;Zhang Liyan(School of Automation,Wuhan University of Technology,Wuhan 430070,China;School of Physics and Information Engineering,Jianghan University,Wuhan 430056,China)

机构地区：[1]武汉理工大学自动化学院,武汉430070 [2]江汉大学物理与信息工程学院,武汉430056

出　　处：《电工技术学报》2019年第17期3631-3639,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(61673305)

摘　　要：在新能源并网逆变器中,基于内模原理的重复控制器被广泛应用,但是由于受到功率管开关特性和直流母线电压的约束,重复控制器存在积分饱和现象,严重影响供电质量。为提高三相四桥臂并网逆变器的并网电流质量,基于模型恢复积分抗饱和方法,研究重复控制器积分抗饱和策略。首先,设计了具有积分作用的重复控制器;其次,根据被控对象的数学模型设计了重复控制积分抗饱和补偿器,对控制量和输出反馈量分别进行补偿,控制量补偿引入控制量饱和偏差,并采用线性二次型最优控制方法优化偏差系数;最后,通过仿真和实验验证了重复控制积分抗饱和策略在动态和稳态饱和情况下均能有效改善系统性能。Repetitive controller based on internal model principle is widely used in the new energy grid-connected converters.However,due to the limitations of power switch and DC voltage,the repetitive controller is prone to windup which affects the quality of power supply seriously.In order to improve the current quality of the three-phase four-leg grid-tied inverter injected to the grid,the anti-windup strategy is researched based on the MRAW(model recovery anti-windup)theory.Firstly,integral controller based on repetitive control is designed.Secondly,anti-windup compensator of repetitive control is designed based on the plant model to compensate the control and output feedback respectively.The saturation deviation of the control variable is introduced to compensate for the control variable,and the coefficient of the deviation is optimized by the linear quadratic optimal control method.Finally,simulation and experimental results validate that the proposed method of the anti-windup compensator can improve the system performance on dynamic and steady state saturation.

关 键 词：三相四桥臂逆变器 重复控制 执行器饱和 模型恢复积分抗饱和 

分 类 号：TM464[电气工程—电器]