Study Of Maximum Power Tracking Control Method Of Capacitive Wireless Power Transfer System

With the implementation of the national marine strategy,the safe,convenient,and high efficiency undersea wireless power transfer(UWPT)system becomes more and more important for undersea equipments.Aiming at undersea capacitive wireless power tranfer(UCWPT)system,the research in this thesis mainly on the power transfer theory of the four-plate coupling capacitor structure UCWPT system and the maximum power tracking control method when the UCWPT system in dynamical marine enviorment.Frist,the feasibility of applying electric field coupling to undersea wireless power transmission is studied.A four-plate coupling capacitor mechanism for underwater wireless power transmission of autonomous underwater vehicles(AUVs)is designed.Two pairs of coupling capacitors composed of four plates and other wireless power transmission elements construct a closed loop path to realize the non-contact transmission of electric energy.And then,based on simulation,the theory of the periodic reciprocating flow of electrons used for the power transmission of the UCWPT system is analyzed and verified.Second,the environment in the ocean is complex and changeable,and the stable output power state of the UCWPT system will dynamically change.Aiming at this kind of UCWPT system with unstable output power due to disturbance,in this study,a maximum power tracking method based on the disturbance observation method is adopted.The maximum transmission power tracking of the UCWPT system under the dynamic changes of the external environment is realized,and the effectiveness of the maximum power tracking control method is verified by MATLAB-Simulink simulation.A 300W power-level four-plate coupling capacitor mechanism UCWPT experimental system is builded in this thesis,a tank is used to simulate the seawater environment,and carrying out a series of undersea wireless power transmission experiments,which verified the correctness of the underwater wireless power transmission theory and the feasibility of the experimental system design Sex.Combined with the RT-BOX real-time simulator,the maximum power tracking control experiment platform of the UCWPT system is constructed,and the experiment verifies the effectiveness of the maximum power tracking control method based on the disturbance observation method.