A Bidirectional Long-Range IPT System Based on Multitap Parameter Reconfigurable Coupling Structure With Discrete Ferrite Bridge

A photovoltaic-energy storage combined meter-range inductive power transfer (IPT) system achieved bidirectional power flow by modifying 110-kV post-insulator is proposed. In order to further improve the efficiency of meter-range IPT system, the discrete ferrite bridge (DFB) is designed to improve the coupling coefficient. Besides, the additional core loss generated by DFB is analyzed, and the impact of DFB on the insulation characteristics of the post-insulator is analyzed. Committed to reduce the degree of the photovoltaic system affected by light intensity, a multitap self-coupling coil is proposed. The dc voltage transformation ratio of the system can be changed by adjusting the switchable taps of the primary or secondary side. The architecture of the bidirectional IPT system is proposed to achieve energy self-sufficiency of the combined system. The power can be supplied to the state detection equipment located on the high-voltage (HV) side of the post-insulator through the combination of photovoltaic panels and energy storage system. The circuit model of the IPT system is established, and the power transfer characteristics and each part losses of the system are analyzed. A bidirectional three-stage IPT system prototype with a total length of 1.66 m is established. Experiments are completed and the maximum efficiency of the system could reach 88.9%.