In the magnetically coupled resonant wireless power transfer (MCR-WPT) system, parameter variations of the resonant network will cause the resonant frequency drift, which will make the system in the detuning state. The detuning will increase the required capacity of the power supply and reduce the transfer efficiency of the system. To solve this problem, this paper analyzes the relation between the input impedance angle of the primary side and the resonant state and proposes an adaptive frequency tracking control (AFTC) method based on the fuzzy PI compound controller. In this method, a fuzzy PI compound controller is used to control the impedance angle (θ = 0), which can make the operating frequency to track the resonant frequency, so that the MCR-WPT system can maintain in the resonant state. The experimental results show that the AFTC method can make the operating frequency to track the resonant frequency faster and accurately during the parameter variations so that the MCR-WPT system can maintain in the resonant state and achieve the higher output power and system efficiency.

在磁耦合谐振无线电力传输（MCR-WPT）系统中，谐振网络的参数变化将导致谐振频率漂移，这将使系统处于失谐状态。失谐将增加电源的所需容量并降低系统的传输效率。为了解决这个问题，本文分析了初级侧输入阻抗角与谐振状态之间的关系，并提出了一种基于模糊PI复合控制器的自适应频率跟踪控制（AFTC）方法。在这种方法中，使用模糊PI复合控制器来控制阻抗角（θ = 0），这可以使工作频率跟踪谐振频率，从而使MCR-WPT系统可以保持在谐振状态。实验结果表明，AFTC方法可以使工作频率在参数变化过程中更快，更准确地跟踪谐振频率，从而使MCR-WPT系统可以保持谐振状态，并获得更高的输出功率和系统效率。