带恒功率负载多电平Buck变换器逆解耦自适应滑模控制  

Inverse decoupling adaptive sliding mode control for multilevelBuck converters with constant power load

作　　者：吴家荣 卢振坤[1] 文春明[1] WU Jiarong;LU Zhenkun;WEN Chunming(College of Electronic Information,Guangxi Minzu University,Nanning 530006,China)

机构地区：[1]广西民族大学电子信息学院,广西南宁530006

出　　处：《电机与控制学报》2024年第6期120-130,共11页Electric Machines and Control

基　　金：国家自然科学基金(61561008);广西高校中青年教师科研基础能力提升项目(2021KY0164);广西民族大学人才引进科研启动项目(2020KJQD25)。

摘　　要：针对带恒功率负载(CPL)多电平Buck变换器的强耦合问题及负阻抗特性引起的不稳定问题,提出一种逆解耦自适应滑模控制策略。建立带CPL多电平Buck变换器的非线性数学模型,基于逆系统方法证明系统的可逆性,并推导逆系统表达式,将模型线性化解耦为多个伪线性子系统,抵消负阻抗特性的影响。通过选取线性滑模面和指数趋近律以减弱滑模抖振,并将自适应机制引入到滑模控制中,进而为线性子系统分别设计自适应滑模控制器,进一步提高系统控制性能。基于李雅普诺夫理论对控制系统的稳定性和鲁棒性进行验证。与现有控制方法进行比较,仿真结果表明,所提控制策略具有更强的鲁棒性和优越性。最后,搭建原理样机进行实验对比,实验结果验证了所提控制策略的正确性和有效性。To solve the problem of strong coupling and the issue of instability caused by negative impedance characteristics of multilevel Buck converters with constant power load(CPL),an inverse decoupling adaptive sliding mode control strategy was proposed.The nonlinear mathematical model of multilevel Buck converters with CPL was established.The reversibility of the system was proved by the inverse system method,and the expression of the inverse system was deduced.The model is linearly decoupled into multiple pseudo-linear subsystems.The negative impedance characteristics are offset.Linear sliding mode surfaces and exponential convergence laws were selected to reduce sliding mode chattering,and an adaptive mechanism was introduced to the sliding mode control,adaptive sliding mode controllers were designed for the linear subsystems respectively to further improve the control performance of the system.Furthermore,the stability and robustness of the control system were verified based on the Lyapunov theory.Compared with the existing control method,the simulation results show that the proposed control strategy has stronger robustness and better superiority.Finally,a prototype was built for experiments,and the experimental comparison results verify correctness and effectiveness of the proposed control strategy.

关 键 词：多电平Buck变换器 恒功率负载 逆系统 自适应控制 滑模控制 解耦控制 

分 类 号：TM46[电气工程—电器]