Research On Design And Optimization Of UAV Wireless Power Transfer System

UAV has strong environmental adaptability and autonomy,so it has been widely used in various fields,but the lack of endurance limits the further development of UAV.At present,wired charging,as the main way of UAV power supply,has the disadvantages of low automation and low safety.Wireless power transfer(WPT)technology is a technology that realizes power transmission through electromagnetic fields.Compared with traditional wired power supply technology,this technology can reduce wired contact during charging and avoid manual replacement of batteries.It has high degree of automation and is more safe and reliable.It also provides the possibility for autonomous charging of large-scale UAVs.However,the UAV is more sensitive to the load.The volume and weight of the receiving end of the WPT system is too large,which will cause problems such as reduced endurance of the UAV and imbalance of the fuselage.At present,the wireless charging system has poor offset adaptability,poor system stability and low power,which affects the normal operation of the system.In view of the above problems,this paper proposes an asymmetric magnetic coupling mechanism to reduce the quality of the receiving end,and conducts multi-objective optimization on the coupling mechanism of the UAV wireless power transmission system.While reducing the quality of the receiving coil,the transmission efficiency of the UAV system is maximized,and the output power of the system is guaranteed.Enhance the unmanned autonomous ability of the UAV and effectively solve the problem of endurance in the field of UAV.The specific research contents of this paper are as follows:(1)Aiming at the lightweight of the receiving coil,the compensation topology design and analysis suitable for UAV WPT system are carried out.Based on the characteristics and load constraints of UAV lithium battery,LCC-S high-order compensation network is used to solve the problem of mutual inductance instability in the charging process of UAV,so as to achieve the purpose of constant voltage output and lightweight receiving end.The coupling mechanism of wireless charging system is studied by using finite element simulation software.An asymmetric magnetic coupling mechanism is proposed,and its magnetic field distribution and anti-offset performance are analyzed by using simulation model.(2)Aiming at the problem that the weight of the coupling mechanism of the UAV WPT system is too large,the multi-objective optimization algorithm is used to optimize the UAV wireless power transmission system.While satisfying the required output power of the system,the weight of the receiving coil is reduced to ensure the transmission efficiency of the system,so that the UAV can flexibly supply power,thereby improving the unmanned autonomy of the UAV and reducing labor costs.(3)In order to verify the transmission performance of the system studied and designed in this paper,on the basis of simulation experiments,the hardware platform of UAV wireless power transmission system based on LCC-S compensation circuit is built and experimental research is carried out.The experimental results show that the system has good anti-offset characteristics while charging the UAV efficiently,leaving a certain space for the landing accuracy of the UAV.