Design and Control of a Novel Wireless Energy Router With Independent Power Transmission Channels

Energy routers are intelligent power electronic systems that enable energy sharing and flexible power flow regulation among various distributed energy sources. Combining the excellent feature of wireless power transfer technology for contactless transmission of electrical energy, this article proposes a novel wireless energy router to realize the power exchange of multiple energy storage devices, such as various mobile electronics, electric vehicles, and energy storage stations. Independent power transmission channels with specific operating frequencies are built between any two of the power-exchanging units. The multiple resonating decoupling compensations are designed and implemented, which offer each power-exchanging unit and various resonate operating frequencies while suppressing the frequency components from irrelevant channels. Moreover, through generation by the bidirectional multilevel converter, the drive voltage of each unit can naturally realize the synthesis of multiple-frequency voltage components. In addition, the decoupled dual-side phase-shift control with capacitor voltage balancing strategy is proposed to regulate the power flow in each power channel. As a result, simultaneous energy sharing among power storage devices can be achieved. And the power flows can be adjusted independently without cross interference. Finally, both simulation and experimental results are presented to verify the effectiveness of the proposed wireless energy router.