An Optimized SPWM Strategy Against Detuning Effect in UWPT System Based on FPGA

The underwater wireless power transfer (UWPT) system may experience system detuning due to the impact of water flow in its surrounding environment, thereby reducing system transmission efficiency. The regular PWM control strategy used in wireless power transfer (WPT) systems contains high-order harmonics that can not be ignored, which can lead to a rapid decrease in system efficiency during detuning. In order to reduce the impact of water flow, This article proposes an optimized PWM strategy for radial offset caused by water flow in UWPT systems, analyzing the reasons for the optimization strategy to reduce the THD of PWM output, and compared the frequency spectra of them. To verify the effectiveness of optimization, the design scheme of this strategy is completed through FPGA and builds an experimental platform. The experimental results show that compared to regular PWM strategy, the optimized PWM strategy significantly improves its resistance to radial offset.