Design of Underwater Renewable Energy WPT System Based on DD-Threaded Pipe Magnetic Coupling Mechanism

AUVs are crucial in marine resource exploration because of their compact size, adaptability, and ability to operate independently. However, as the power source of the AUV, the battery's size, energy density and other factors greatly limit the working endurance time and motion survey range of the AUV. To address this issue, a wireless power transfer (WPT) system with a DD-threaded asymmetrical structure coil is proposed, utilizing a double LCC composite compensation topology to maintain a constant output current on the secondary side. Impedance analysis is used to design a WPT system for wirelessly charging the AUV with the fuel cell onboard the UUV, achieving a 20kW output power. Simulation results verify an efficiency of 93.52%.