Design And Optimization Of Double D Orthogonal Underwater Wireless Power Transfer System

The advancement of underwater detection and delivery equipment technology has greatly promoted the development and utilization of China’s seabed resources.As an important marine exploration technology and equipment,autonomous underwater vehicles need to consider new power supply methods in order to solve their endurance problems.Wireless power transmission technology is receiving more and more attention due to its advantages such as safety,reliability,flexibility and concealment.The characteristics of seawater media are significantly different from those of air.Coupled with the complexity of the underwater application environment,underwater wireless power transmission technology faces more problems.This article designs and optimizes the dual-D orthogonal underwater wireless power transfer system.The equivalent circuit model of the magnetic coupling mechanism in seawater is the basis for exploring the characteristics of underwater wireless power transmission.This paper derives a more accurate equivalent circuit model of the intensive parameter of the underwater magnetic coupling mechanism through the electromagnetic field model,and fully considers the influencing factors of the equivalent self-resistance and mutual resistance of eddy current loss.The simulation and experiment verify that the model has good accuracy and versatility,which lays the foundation for the design of the magnetic coupling mechanism and the compensation topology.The efficiency of the magnetic coupling mechanism in the seawater environment is reduced due to the increased eddy current loss,and the complex underwater environment also requires its anti-offset performance.In this paper,a double-D orthogonal magnetic coupling mechanism is adopted.From the perspective of the magnetic circuit,the maximum transmission efficiency and the maximum area energy transmission density are the optimization goals,and the optimization of its structural parameters is achieved.An experimental platform was built to verify that the optimized magnetic coupling mechanism has good coupling performance,antioffset performance,and higher energy density.The compensation topology directly participates in the compensation of reactive power and the processing of active power in the resonant network in the underwater wireless power transfer system,and affects the output performance of the system.This paper fully considers the difference of the equivalent circuit model of the magnetic coupling mechanism in seawater.The resonant network with constant voltage source input and constant current source output is used as the design object,and the parameters of the compensation topology are optimized with the goal of optimizing efficiency.Simulations and experiments verify that the optimized compensation topology can ensure the system to achieve efficient and stable energy transmission.Affected by the disturbance of seawater,there is inevitably a certain offset between the transmitting end and the receiving end of the magnetic coupling mechanism,which causes the problem of a decrease in the transmission power and transmission efficiency of the system.This paper takes the double-D orthogonal wireless power transfer system as the object,and proposes an efficiency optimization control method.By adjusting the input voltage amplitude ratio of the resonant network,the output power is controlled while improving the efficiency to a certain extent.Experiments show that the system can still maintain stable and efficient power transmission when the coupling coefficient has a large variation range,which verifies the effectiveness of the control method.