Research On Magnetic Coupling Resonant Wireless Power Transmission System Based On Maximum Power Tracking

Research on high-efficiency and high-power wireless power transmission technology is of great significance to promote the rapid development of electric vehicles.Maximum power tracking technology is an important step in wireless power transmission for electric vehicles.In this paper,the resonant network optimization and control strategy improvement of the wireless power transmission system are theoretically studied,and related experiments are carried out on the wireless power transmission system based on the simulation data.First,for the magnetic coupling resonant wireless power transmission system,the basic principle and basic structure of the MCR-WPT system are introduced,and three different theoretical models are analyzed.Then,the three resonance topologies of the system parallel,double-sided LCL,and double-sided LCC are modeled and compared.Secondly,in view of the problem of incomplete power transmission and low transmission efficiency caused by load changes in the magnetic coupling resonance wireless power transmission system,a double-sided LCC-type wireless power maximum power transmission design method is proposed.According to the influence of generalized detuning factor,quality factor and coupling factor on load normalized power and transmission efficiency under the condition of load change,the method derives the critical coupling point conditions,and design capacitor and inductance parameters considering the impact of capacitor withstand voltage and high-order harmonics and match the equivalent load impedance.The capacitance parameters under the influence of the wave realize the maximum power transmission based on the constant current and symmetry of the double-sided LCC,and a simulation platform is built to verify the correctness and feasibility of the method.Then,combining the characteristics of frequency splitting under over-coupling in the magnetic coupling resonance wireless power transmission system,an adaptive chaotic particle swarm algorithm based on the variance of particle position is proposed to achieve maximum power tracking.Aiming at the problem that the particle swarm algorithm is easy to fall into the premature state,the chaotic perturbation strategy is introduced to the algorithm first.By taking the global optimal particle as the initial position,the particles in the premature state can get rid of the local optimum and increase the diversity of the population;at the same time,it is strengthened.The algorithm’s early global search capability and later convergence are measured by the variance of particle position to measure the progress of the algorithm.The algorithm is applied to the maximum power point tracking,and the simulation verifies the advantages of the algorithm in convergence accuracy and speed.Finally,the magnetic coupling wireless power transmission system is designed,a low-power wireless power transmission system experimental platform is built,the researched theory is embedded in the wireless power transmission system,the resonance structure and power tracking experiments are carried out,and the efficient transmission of wireless power is realized.