全方向WPT系统磁耦合参数识别方法研究

Research on Identification Method for Magnetic Coupling Parameters in Omnidirectional WPT System

全方位三激励WPT系统中接收端和发射端之间的磁耦合参数是影响系统传输效率的重要因素,对耦合参数进行有效地辨识是使全方位WPT系统达到最大效率的关键。在采用高频逆变器作为发射线圈激励源的情况下给出逆变输出电压各次谐波的数学描述,在移相角为π/3的条件下忽略谐波,将输出的方波电压用波形具有标准正弦形状的基波来近似替换。在此基础上推导出系统发射端电流有效值的数学模型,引入改进的遗传算法,将参数辨识问题转换为全局寻优问题,给出基于该模型的磁耦合参数辨识方法,并通过仿真及实验验证了所提方法的可行性及有效性。

The magnetic coupling parameters between the receiving and transmitting ends in an omnidirectional three-excitation wireless power transfer(WPT)system are important factors affecting the transmission efficiency of the system,and an effective identification of the coupling parameters is the key to the maximum efficiency of the omnidirectional WPT system.In this paper,a mathematical description of the harmonics of inverter output voltage is given when a high-frequency inverter is used as the excitation source of the transmitting coil.Under the condition of a phase shift angle of π/3,the harmonics are ignored,and the output square wave voltage is approximately replaced by a fundamental wave whose waveform has a standard sinusoidal shape.On this basis,a mathematical model of the effective value of current at the transmitting end of the system is derived.An improved genetic algorithm is introduced,the parameter identification problem is converted into a global optimization problem,and the magnetic coupling parameter identification method based on this model is given.Simulation and experimental results verified the feasibility and effectiveness of the proposed method.