Research On Key Technologies For The Buoy Of Multiple Loads Inductively Coupled Power Transfer

As important observation devices in the marine stereoscopic observation network,mooring buoys and submerged buoys have two key issues which are restricting their development.The first is how to realize the real-time power supply for underwater devices mounted on the mooring cable,and the second is how to obtain the observation data coverty and regularly from the submerged buoy.In order to break through those bottlenecks,this thesis uses multi-load inductively coupled power transfer(ICPT)to realize the power supply for underwater devices and the regular acquisition of the submerged buoy data.The double closed-loop indirect control and optimal efficiency tracking have been proposed to ensure the balanced charging of the time-varying multiload ICPT system,as well as greatly improve the average efficiency of the entire charging process of the system.The main research results are as follows:1.Aiming at the ICPT structure of the shared mooring cable loop,the electromagnetic model of the mooring multi-load ICPT system is established.The electromagnetic link between the above magnetic coupler(AMC)and the multi-load under magnetic coupler(UMC)is constructed by a mooring cable.Combining with the port network and the loop equation,a unified mooring multi-load ICPT system model is established.2.In order to ensure the balanced charging of underwater devices,the theoretical models for constant voltage and current output of different compensation topologies are established.As for the mooring multi-load ICPT system with constant AMC coil parameters,the S-S-S and S-S-CCL compensation topology is applied to realized the balanced charging of underwater devices.Besides,the influence of the parasitic resistance and tolerance of compensation components on the constant voltage and current output of the system is analyzed in detail,which provides guidances for the selection of compensation components.3.The swivel AMC structure is proposed to release the torque of the mooring cable,and the indirect double closed-loop control strategy of the time-varying ICPT system is proposed.By constructing a dual closed-loop strategy for the mooring cable current control and ultracapacitor charging management,the problem that the time-varying mooring multi-load ICPT system is difficult to balance charging is solved.It is realized that double ultracapacitor modules can be charged stably with different initial voltage,and the maximum system efficiency achieves 65.72%,which fully meets the needs of real-time power supply for underwater devices.4.On the basis of realizing the real-time power supply of underwater devices,the method to improve the efficiency of the entire charging process of the multi-load ICPT system is studied.The ICPT beacon is used to transmit data coverty and regularly from the submerged buoy.The dual closed-loop maximum efficiency tracking strategy is proposed for the "multi-transmitting and multi-receiving coil" structure,and the average efficiency of the three-ICPT-beacon system supercapacitor charging process is increased from 62.8% to 71.4%,greatly reducing the energy loss of charging.