DC-Link Voltage Control for Series-Parallel Wireless Motor without Communication Considering System Nonlinearity

This paper proposes a dc-link voltage control (DVC) strategy without communication between primary and secondary sides for a series-parallel wireless motor (SPWM) system. Communication devices, such as Bluetooth, can be removed, which can eliminate the influence of wireless communication failure on the voltage feedback control. In the DVC strategy, the time-frequency domain hybrid (TFDH) modeling approach is proposed for dc-link voltage estimation. Since the nonlinearity of the diode rectifier and all the electric power components are considered, the accuracy of the voltage estimation can be improved compared with the FHA-based method. Finally, the effectiveness of the proposed DVC strategy is verified by simulation for the SPWM system.