Steady-state performance assessment of different compensation topologies in two-way IWPT system for EV ancillary services

Electric vehicles (EV) can act as an energy consuming system or an energy resource in the concept known as vehicle-to-grid (V2G) and grid-to-vehicle (G2V). The bidirectional wireless charging system is an effective choice for this application, since it provides automatic, reliable and safe operation. This paper presents evaluation analysis for the steady-state performance of bidirectional inductive wireless power transfer (BIWPT) system. The analysis is presented here for three different compensation configurations; LC-series, LC-parallel and LCL-topology. Moreover, the steady-state equivalent circuit-based mathematical models for all topologies are developed. These models were used to determine the system performance during V2G and G2V operations. The proposed models were verified both in simulation and experiment. The proposed models provide accurate estimation for the system performance under different operating and control conditions.