EV-BWPT无缝功率环移相控制策略研究

Research on Seamless Power Loop Phase-shift Control Strategy for EV-BWPT

电动汽车双向无线电能传输系统以其便捷性、安全性和可靠性高等优势,在车网互联时代得到广泛应用。与传统的单向系统相比,双向系统需要在多个不同控制自由度中进行选取,从而影响系统传输效率。为降低系统无功功率,提高效率,提出一种双向无线电能传输系统无缝功率环移相控制策略。首先,对基于双边LCC补偿网络的双向无线电能传输系统进行了有功和无功功率传输特性分析,得出有功/无功功率与效率、内移相角及外移相角之间的关系;进而提出采用有功功率环路控制外移相角、无功下垂环路控制内移相角的无缝功率环移相控制策略,且该控制策略无需切换模式即可实现功率正反向流动;最后,通过Matlab/Simulink以及半实物实验平台,验证该控制方法的有效性。

The bidirectional wireless power transfer(BWPT)system of electric vehicles(EVs)is widely applied in the era of Internet of Vehicles owing to its advantages such as convenience,safety and reliability.Compared with the traditional unidirectional system,the bidirectional system has to select among different control degrees of freedom,thus affecting its transmission efficiency.To reduce the system’s reactive power and improve its efficiency,a phase-shift control strategy of seamless power loop in the BWPT system is proposed.First,the transmission characteristics of active/reactive power of the BWPT system based on bilateral LCC compensation network are analyzed,and the relationships among active/reactive power and the efficiency,inner phase-shift angle and outer phase-shift angle are obtained.Then,a seamless power loop phase-shift control strategy is proposed,which adopts the active power loop to control the outer phase-shift angle and the reactive power droop loop to control the inner phase-shift angle.In addition,the forward and reverse power flow can be realized without switching modes.Finally,through Matlab/Simulink and a hardware-in-the-loop experimental platform,the effectiveness of the proposed control method is verified.