Abstract: In multi-port wireless energy interconnection system with virtual AC bus for regional power interconnection application, the low coupling coefficient of bipolar coils will lead to high busbar side coil loss and low system efficiency. Therefore, a hybrid coil configuration is put forward, where some of the bipolar coils in the original unitary configuration are replaced by planar square coils to improve the coupling coefficient on the premise of multi-coil cross decoupling. Based on this configuration, the optimization design of system parameters is carried out. With the idea of coil separation and equivalence, a unified coil modeling method is proposed, and the optimal values of coil turns, compensation inductance and bus current amplitude for maximum efficiency can be obtained. Finally, four-port prototypes are built to verify the effectiveness of the proposed coil configuration and parameter optimization design, and the system efficiency in different operating modes is increased by more than 8% after optimization.