一种双拾取动态无线电能传输系统控制方法研究

Research on a control method based on double pick-up in a DWPT system

为提高动态无线电能传输系统的控制速度并保证移动供电时的电压稳定性和高效率,提出了一种基于双拾取耦合结构的互感估计控制方法。通过建立系统电压和输出功率的数学模型,分析了最优控制占空比与互感以及每个拾取电路等效串联电阻的关系,给出了一种通过直接计算占空比的闭环控制方法。在与发射端无通信连接的情况下,该控制方法能够提高拾取端电路的控制速度,且可以同时实现恒压输出与效率优化。实验结果表明,采用该控制方法的动态无线电能传输系统,在移动时负载侧输出电压能够保持恒定,输出电压的波动率为±0.988%,系统最高效率达93.18%,实验证明了所给出控制方法的有效性。

In order to improve the control speed of a Dynamic Wireless Power Transfer(DWPT) system and ensure voltage stability and high efficiency of the system during dynamic charging, a control method is proposed based on estimation of mutual inductance of a double pick-up coupling structure. By building the mathematical model of output voltage and power, the relationship between the optimal duty cycle and parameters including mutual inductance and equivalent series resistance of each pickup circuit is revealed. A closed-loop control method by directly calculating the duty cycle is presented. In the case of no communication connection with the transmitting side, the proposed control method can improve the control speed of the pick-up circuit and realize constant output voltage and efficiency optimization simultaneously. The experimental results show that with the proposed control method, the output voltage at the load side is constant during load moving. The output voltage fluctuation is within ±0.988%, and the maximum efficiency of the system is 93.18%. The experimental results have verified the validity of the proposed control method.