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| Discrete-Time Modeling of Wireless Power Transfer System Based on Phase-Shift Control |
| Ma Tianlu, Wang Yue, Hu Xiufang, Lin Zijie |
| State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an 710049 China |
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Abstract 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.
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Received: 02 July 2020
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2021, Vol. 36 
