多电平Buck变换器的逆解耦内模控制

Inverse Decoupling Internal Model Control for Multilevel Buck Converter

为解决多电平Buck变换器中飞跨电容电压平衡控制的复杂问题,以及飞跨电容电压与输出电压的解耦难题,提出逆解耦内模控制方案。建立系统的非线性数学模型,基于逆系统理论完成系统的可逆性证明,实现系统的线性化与解耦,得到多个单输入单输出伪线性子系统,进而通过选择正则滤波器,分别为子系统设计内模控制器,并对控制系统的稳定性和鲁棒性进行分析。仿真结果表明,所提控制策略能有效提升系统的抗干扰性能和动态调节能力,实现飞跨电容电压与输出电压的解耦。实验结果进一步验证了所提控制策略的正确性。

To solve the complex problem of flying capacitor voltage balance control and the problem of decoupling between flying capacitor voltage and output voltage in a multilevel Buck converter,an inverse decoupling internal model control scheme is proposed.The nonlinear mathematical model of the system is established,and the reversibility of the system is proved based on the inverse system theory.The linearization and decoupling of the system are realized,and multiple single-input single-output pseudo-linear subsystems are obtained.Furthermore,internal model controllers are designed for the subsystems by selecting regular filters,and the stability and robustness of the control system are analyzed.Simulation results show that the proposed control strategy can effectively improve the anti-interference performance and dynamic regulation capability of the system,and realize the decoupling between flying capacitor voltage and output voltage.Experimental results further verified the proposed control strategy.