| The wide application of Wireless Power Transfer(WPT)technology provides a safe,reliable and convenient solution for power transmission.Magnetic Coupling Wireless Power Transfer(MC-WPT)technology,which uses alternating magnetic field as the energy transfer medium,is a major research hotspot and has received wide attention.It has formed a mature theoretical system and been applied in many fields.In the practical application of MC-WPT technology,mutual inductance and load may change,which will affect the transmission performance of the system.So it is important to obtain the mutual inductance and load.At the same time,there is a requirement for the output voltage of the system.Based on the results of parameter identification and the corresponding output voltage control method,stable electric energy can be transferred to the devices.In this paper,the application background,research status,purpose and significance of MC-WPT system parameter identification technology are firstly introduced.Secondly,the main components of MC-WPT system are analyzed in sequence.LCC-S topology is selected as the main object,and its mathematical model is established based on AC impedance analysis combined with phase-shifted control method.Thirdly,the intelligent optimization algorithm is introduced to identify the system parameters under the above complex mathematical model.The classical genetic algorithm(GA)and particle swarm algorithm(PSO),which can be mixed based on their advantages,are applied in the parameter identification.According to the different requirements for the number of parameters in mutual inductance and load identification,the parameter identification is divided into two modes,single parameter identification and double parameter identification.Sampling data and GA-PSO mixed algorithms for different identification modes are selected reasonably,and the configuration of algorithm parameters and the planning of operation process are carried out.Then,the relationship of the phase-shifted angle conditions and the output voltage are analyzed,and the corresponding control flow is designed based on the results of mutual inductance and load identification.Then,according to the basic parameters of MC-WPT system,a simulation model for parameter identification and phase-shifted constant output voltage control is built on MATLAB/Simulink,which is used to verify the accuracy of parameter identification under different mutual inductance and load.Finally,a hardware experimental platform is built to verify the rationality of the mutual inductance and load parameter identification algorithm and output voltage control strategy.The conclusion is that the identification algorithms in both parameter identification modes can get accurate results,and the control of output voltage based on the identification results is also accurate. |
