Design And Control Of Multi-load Magnetically Coupled Resonant Wireless Power Transmission System

With the continuous rise of new energy technology in China,Wireless Power Transmission technology has come into the limelight,and magnetically coupled resonant WPT technology has received more and more attention due to its advantages of long range,safety and convenience in recent years.So far,scientists have studied from static systems to dynamic systems,from single-load systems to multi-load systems.With the widespread introduction of small and medium power electronics,the need for wireless power supply to multiple loads at the same time has become increasingly urgent,but the research on multi-load systems is still in its infancy.Therefore,the focus of this thesis was on multi-load magnetically coupled resonant WPT systems,where the problems of cross-coupling,poorly coordinated power distribution and low efficiency were analysed.Firstly,this thesis explained the basic principles of resonance,the basic structure of the system and the equivalent circuit theory,compared the basic resonance compensation network and the shape of the coupling mechanism coils,and concluded that the model of the WPT system with rectangular coils for the coupling mechanism and series-string type for the compensation network was more suitable for the multi-load system.On this basis,the transmission mechanism of a multi-load magnetically coupled resonant WPT system was analysed,the system with cross-coupling was compared with an ideal system,and a method of increasing capacitance was proposed to eliminate cross-coupling.This thesis also introduced that by controlling the voltage across the load,the same objective was achieved as controlling the mutual inductance between the receiver and transmitter coils,and the relationship between the voltage across the load and the transmission characteristics of this system was analysed through simulation plots.Secondly,the DC/DC converter voltage regulation control scheme based on the improved Particle Swarm Optimization was proposed.The analysis of the voltage regulation and the design of the general flow and architecture of the control scheme were also presented.Finally,the model was built and simulated through Matlab,and the simulation results were used to compare the effects of the standard PSO and the improved PSO on the power and efficiency of this system,and it was concluded that the DC/DC converter voltage regulation control scheme based on the improved PSO played a significant role,which in turn validated the method.