适用于Boost三电平变换器的模型预测控制方法

相比于传统的双闭环控制,模型预测控制(MPC)具有动态响应快、无需调节PI参数以及可以增加系统状态变量约束等优点,被广泛应用于DC-DC变换器的控制中。而在大多数的研究中,一般采用的是有限控制集模型预测控制(FCS-MPC)方法,但这种控制方法无法提供固定的开关频率。因此,针对Boost三电平变换器,提出了一种基于连续控制集模型预测控制(CCS-MPC)的固定开关频率控制方法,其可同时实现输出电压控制以及平衡输出侧中点电位2个控制目标,并且在评价函数中无需调节不同控制目标的权重系数,简化了控制器参数设计难度。通过MATLAB/Simulink软件和dSPACE实时仿真系统进行仿真与实验,结果都证明了理论分析的正确性。

Model predictive control method for Boost three-level converter

Compared with the traditional double closed-loops control, MPC(Model Predictive Control) is widely used in the control of DC-DC converters because of its advantages such as fast dynamic response, no PI parameters and additive system state variables constraints. However, FCS-MPC(Finite Control Set-Model Predictive Control) method is generally used in most researches, which has no fixed switching frequency. Therefore, in view of Boost three-level converters, a fixed switching frequency control method based on CCS-MPC(Continuous Control Set-Model Predictive Control) is proposed, by which two control objectives including output voltage control and balance control of output-side neutral point potential can be achieved. At the same time, the proposed method ensures that there are no weighting factors in the cost function, which simplifies the controller parameter designing. Finally, the simulation and experiment are carried out by MATLAB/Simulink software and the dSPACE real-time simulation system. The results prove the correctness of the theoretical analysis.