Research On Resonant Compensation Of Buoy Inductively Coupled Power Transmission System

The ocean contains huge resources and is the foundation on which humankind depends for survival and development.Ocean observation is a prerequisite for understanding,exploring and developing the ocean,and is the technical support of ocean science.Ocean buoy become an important part of the ocean observing technology along with the development of marine science.In the anchored buoy,because of the long cable,traditional contact power supply has many disadvantages such as installation and layout,and the like,which are prone to safety hazards.To solve the above problems,underwater non-cantact power transmission becomes hotspots in research and application.Inductively coupled power transmission(ICPT)is based on the principle of electromagnetic induction,enabling non-contact power transmission.Since there is no physical contact between primary coil and secondary coil,ICPT technology has advantages in many special power supply fields such as underwater environment.So ICPT can be utilized for anchored buoy underwater sensors power supply,which has the features stabilization and reliably in the long term.In the buoy system of this paper,the mooring cable is used as a transmission media,then power transmission is achieved through two-stage coupling of an upper coupler and a lower coupler.The system with three circuits currently has low power and efficiency as a result of its special structure.In order to optimize the transmission capacity,this paper takes the resonance compensation of buoy ICPT system as research object.First of all,the electromagnetic coupler,which is regarded as the core components of the system,is modeled.The analytical calculation formulas of relevant parameters are obtained according to this model,which lays a theoretical basis for parameter selection.Second,the characteristics of system in basic compensation and LCL compensation are compared to select the suitable compensation method.The design elements of compensation circuit are summarized.Thirdly,the parameters are selected and the simulation is conducted,including the relationship between coil self-inductance,coil loss resistance and gap,as well as the output power between basic compensation and LCL compensation.Finally,the experiment platform is designed and the experiments are carried outThe results show that output power and efficiency of the ICPT system with LCL compensation are 18.637W and 0.54 respectively,under the condition of 12V power supply and 0.2mm air gap.The output current is constant.The optimization of system performance is realized.At the same time,the system with LCL compensation is more powerful when underwater secondary equivalent quality factor is less than 1.