基于逆系统解耦的三电平Buck变换器反步滑模控制  

Backstepping Sliding Mode Control of Three-level Buck Converter Based on Inverse System Decoupling

作　　者：蒋经纬 陆益民[1] JIANG Jingwei;LU Yimin(School of Electrical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学电气工程学院,南宁530004

出　　处：《电源学报》2024年第2期73-80,共8页Journal of Power Supply

基　　金：国家自然科学基金资助项目(52167021);广西自然科学基金重点资助项目(2018GXNSFDA281037)。

摘　　要：多电平变换器因其可以降低开关管承受的电压应力、减小滤波电感和滤波电容体积,被广泛应用在直流微电网中。三电平Buck变换器的飞跨电容电压和输出电压存在耦合,是一个多输入多输出、强耦合的非线性系统。针对这一问题,提出一种逆系统解耦反步滑模控制方法。采用逆系统方法实现输出电压控制和飞跨电容电压控制的解耦,采用反步滑模法控制保证输出电压的稳定性和鲁棒性,通过状态反馈控制将飞跨电容电压平衡在输入电压的1/2处。仿真和实验结果表明,所提控制策略能使得飞跨电容电压和输出电压均具有良好的稳态和动态特性。Multi-level converters are widely applied in DC microgrids because of their capability to reduce the voltage stress on switches and the volumes of filtering inductors and filtering capacitors.Since the flying-capacitance voltage and output voltage of a three-level Buck converter are coupled,the converter is a nonlinear system with strong coupling of multi-input and multi-output.To solve this problem,a decoupled backstepping sliding mode control method for inverse system is proposed in this paper.The inverse system method is used to decouple the output voltage control and flying-capacitance voltage control,and the backstepping sliding mode control method is used to ensure the stability and robustness of output voltage.The flying-capacitance voltage is balanced at 1/2 of the input voltage by the state feedback control.Simulation and experimental results show that the proposed control strategy can achieve satisfying steady-state and dynamic characteristics of flying-capacitance voltage and output voltage.

关 键 词：三电平Buck变换器 多输入多输出系统 解耦控制 反步滑模控制 

分 类 号：TM46[电气工程—电器]