A Modular Stacked Architecture with Virtual AC Bus for Multi-port Wireless Energy Interconnection System

For multi-source and multi-load wireless power transfer (WPT) applications, a novel architecture of modular stacked multi-port wireless energy interconnection system (WEIS) with virtual AC bus is presented in this paper, which has following advantages: 1) it can serve as the interface among multiple sources and multiple loads; 2) bipolar coils are applied to eliminate the cross-coupling among multiple coils; 3) the relay coils with constant current characteristics are adopted as a virtual AC bus, and the system power distribution is greatly simplified by the proposed phase-shifted control method; 4) the modularization of power converters, coils and compensation networks greatly enhances the system applicability and scalability. A four-port WEIS prototype with the rated power of 2kW was built, and experiments were carried out for typical operation modes including single-source three-load mode and dual-source dual-load mode, which verified the effectiveness of the proposed system architecture.