基于滑模控制的感应耦合电能传输系统输出电压控制研究

Investigation of Output Voltage Control for the Inductive Power Transfer System Based on Sliding Mode Control Theory

感应耦合电能传输系统通过非接触的方式将系统能量从电源侧传递至负载侧。由于该系统具有负载参数变化、系统结构复杂、工作频率高等特点,系统控制器面临着设计难的问题。提出了一种基于滑模控制理论的输出电压控制器,采用移相控制方法实现了对输出电压的控制。该控制方法有效降低了系统建模难度,同时提高了系统输出电压响应特性。通过简化系统结构,推导出滑模控制器的具体表达式,并给出了滑模控制系数的选取方法。通过建立IPT实验系统,在不同负载工作工况条件下进行实验验证。对比传统PI控制方法和所提出的滑模控制方法,实验结果表明滑模控制方法响应更快、对系统负载参数变化不敏感、鲁棒性及动态性能更好,能够较好控制IPT系统的输出电压。

The power can be transferred from primary coil to secondary coil without direct contact using the inductive coupling power transfer system. It’s difficult to design the system controller because of the change of load parameter, the complexity of the system structure and the higher operating frequency. A sliding mode controller based on Sliding Mode Control（SMC）theory is proposed to achieves the aim to control the output voltage via the phase-shift control strategy. This controller can dramatically improve the dynamic response performance of the system and it can reduce the dimension of the modelling method of traditional control systems. Firstly, the sliding mode controller is derived according to LCL-S based IPT system, and then the method of Sliding-mode coefficients selection is provided. Finally, the IPT experimental system is setup and tested under various conditions. The experimental results show that the sliding mode control has the characteristics such as faster dynamic response and less sensitive to the parameters mismatch, and better stability of the output voltage compared to the fine-tuned PI controller.