This article proposes a modular stacked multiport wireless energy interconnection (WEI) system with a virtual ac bus for multisource and multiload wireless power transfer (WPT) applications, which has the following advantages. 1) It can serve as an interface for WPT among multiple sources and loads. 2) Bipolar coils are adopted to eliminate the undesired cross-coupling among multiple coils, which simplifies the complexity of system modeling and power flow control. 3) The relay coil with constant current characteristics is introduced as a virtual ac bus, from which the derived multicoil structure provides the bidirectional channel for power transfer between any two ports. 4) System applicability and scalability are greatly enhanced due to the modularization of coils, power converters, and compensation circuits. For power flow control, the hybrid phase-shifted control method matched with the WEI system is applied, in which the power flow direction is determined by the external phase-shifted angles between ports, whereas the power values are regulated by the internal phase-shifted angles. Furthermore, the peak value of the current of the virtual ac bus, as an intermediate control variable, is controlled to be constant; thus, distributed control can be further realized. Finally, a four-port experimental prototype was built and experiments were carried out under different operating conditions. The efficiency curves and loss distribution, as well as the tolerance analysis of coil misalignments, are given. From the experimental results, the effectiveness of the proposed system architecture and its power flow control strategy is verified.

中文翻译：

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虚拟交流总线模块化堆叠多端口无线能源互联系统及其潮流控制策略


本文提出了一种用于多源和多负载无线功率传输（WPT）应用的具有虚拟交流总线的模块化堆叠多端口无线能量互连（WEI）系统，该系统具有以下优点。 1）它可以作为多个源和负载之间WPT的接口。 2）采用双极线圈，消除了多个线圈之间不需要的交叉耦合，简化了系统建模和潮流控制的复杂性。 3）引入具有恒流特性的继电器线圈作为虚拟交流总线，由此衍生出的多线圈结构为任意两个端口之间的功率传输提供双向通道。 4）由于线圈、功率变换器、补偿电路的模块化，系统的适用性和可扩展性大大增强。潮流控制方面，采用与WEI系统配套的混合移相控制方法，其中潮流方向由端口间的外部移相角决定，而功率值由内部移相角调节。角度。进一步地，将虚拟交流母线的电流峰值作为中间控制变量控制为恒定；从而进一步实现分布式控制。最后搭建了四端口实验样机，并在不同工作条件下进行了实验。给出了效率曲线和损耗分布，以及线圈不对中的公差分析。实验结果验证了所提出的系统架构及其潮流控制策略的有效性。