Application Potential Extension of PSDF Buildings Based on Output-Parallel EV Wireless Charging

For PSDF (photovoltaic, storage, DC, flexible) new building power distribution system, EV wireless charging is a promising application case due to its bi-direction power transfer and control flexibility. To extend application of PSDF buildings, output-parallel wireless charging topology is proposed in this paper, which employees relatively low input voltages to achieve higher power transfer. This topology can greatly increase the charging power and enlarge the application fields from household EV to industrial fields, such as heavy-duty truck charging. Meanwhile, the method is able to increase the flexible load regulation margin of the PSDF building. To ensure the stability of the system, the output current from different modules should be consistent. However, differences in component parameters between channels can affect magnitude of the output current. Meanwhile, the circuit topology interaction between the channels tends to influence control performance. In this paper, a dual-channel output-parallel wireless power transfer system is established as a dual-input dual-output system, which then is estimated by the instrument variable method. Based on the identified separate and interaction models, the inverted decoupling method is developed to make up the vibration owing to interaction. Moreover, the internal model control is adopted to the decoupled system to realize the current control. Simulation and experiment results on WPT system demonstrate that the control error due to the interaction is reduced.