基于移相控制的无线电能传输系统离散迭代建模

Discrete-Time Modeling of Wireless Power Transfer System Based on Phase-Shift Control

该文考虑电容和电感寄生电阻的影响,建立基于移相控制的串联补偿无线电能传输系统的离散迭代模型。给出一个开关周期内,离散迭代建模不同状态区间的划分原则,并通过列写每一状态区间的物理方程,得到状态表达式。同时,总结不同状态区间系统状态方程系数矩阵和输出矩阵与系统参数的关系,最终建立一个开关周期内系统精确的离散迭代模型。利用离散状态空间表达式求取系统的稳态工作点。为了描述无线电能传输系统的动态性能,利用扰动传递的思想,建立基于离散迭代模型的小信号模型。仿真和实验结果证明了所建立模型的有效性和准确性。

In this paper,considering the influence of parasitic resistance of capacitance and inductance,a discrete-time model of series compensation wireless power transfer system based on phase-shift control is established.The partition principle of different state intervals for discrete-time modeling in one switching period is given.By deriving the physical equations of each state interval,the state expression is obtained.In addition,the relationship between coefficient matrix and output matrix of state equation and system parameters is summarized.Finally,an accurate discrete-time model of system in one switching period is established.The steady-state operating point of the system is obtained by state space equation of discrete-time model.In order to describe the dynamic performance of wireless power transfer system,a small signal model based on discrete-time model is established by using the idea of disturbance transfer.Simulation and experimental results show the effectiveness and accuracy of the model.