Research On Adaptive Tracking Algorithm For Asymmetric Coupled High Frequency Power Supply

Climate change,energy shortage and other issues is a long-term problems faced by human society.Whether the problem of exhaust emissions and energy consumption can be effectively solved in the traffic field directly affects the quality of human's life,and the green energy of electric vehicles become the focus of the study once again.Wireless power transmission(WPT)technology is a safe,convenient and effective new charging method,which can be used as a effective supplement to the electric vehicle charging ways.According to the characteristics of the technology and some problems which exist,this paper studies the working mode,topology structure and control algorithm of the system,and put forward the improvement scheme.Aiming at the coupled mode theory in electromagnetic field and the circuit theory in electric field,the mathematical model of the wireless power transmission technology is established,and the cause of the transmission characteristic are discussed.And the critical state of the system maximum power and the reason of the frequency splitting phenomenon are studied,then the mechanism of system efficacy conflicts under coupled condition are discussed.In view of the energy efficiency characteristic of WPT system,this paper put forwards a set of efficient and strong robustness of wireless power transmission power supply scheme.Firstly,a power factor correction method based on average current control of WPT system is designed to improve the harmonic pollution,and a small signal mathematical model is established for the power factor correction of the system,and the conditions that meet the system stability are discussed.At the same time,based on the frequency stability of WPT system,a frequency tracking method based on PI control is put forwarded,and the closed-loop transfer function in time domain is established,then the prerequisite of frequency stability is discussed.Then the paper designs a 300W experimental prototype system,and analyzes the frequency tracking characteristic and stability characteristic of the power supply,moreover,the system distance characteristic and direction characteristic are experimentally.Finally,considering the non-linear dynamic characteristics of multiply energy storage resonant network in IPT system,a general simplified model of wireless power transmission system is established by generalized state space averaging method,and all kinds of uncertainties and external disturbances caused by the frequency stability is studied.In this paper,an improved adaptive tracking control method based on the emission current is proposed,and the uncertain factors are considered as the external disturbances in the auto-disturbance-rejection control(ADRC).and based on this,an adaptive tracking control scheme for inductive coupled wireless power transmission is designed.The simulation results show that the adaptive tracking controller has strong robustness and can stability control the system's transmitting circuit when the system state parameters or input/output changes drastically,this scheme has a strong application value.