Research Of Adaptive Tuning Magnetically Coupled Resonant Wireless Power Transfer System Based On Magnetic Amplifier

Electric energy has become an indispensable energy for human production and life.In modern power system,the transmission of electric energy is an important part of the power system.Traditionally,wire contact is used for power transmission,but with the development of science and technology,there are some loss risks such as friction and aging in traditional wire contact,and leakage risks in some special occasions such as underground and underwater transmission.The above situation urgently needs a new power transmission method to solve,and the efficient,stable and safe wireless power transfer mode emerges as the times require.Wireless power transfer via magnetic resonance coupling has the advantages of high transmission efficiency,long transmission distance and high transmission power.But the magnetically coupled resonant radio transmission technology is very sensitive to frequency changes.It is required that both the power supply frequency and the inherent resonance frequency of the circuit on the transmitting side should be the same,and the inherent resonance frequency of the circuit on the transmitting side and the receiving side should be the same.Scholars at home and abroad have made extensive theoretical exploration and applied research on the technology.At present,the existing tuning methods often use frequency tracking or capacitance array matching method.However,when the inherent resonance frequency of the system changes due to the change of circuit parameters,the above method cannot achieve continuous smooth tuning.Therefore,adaptive tuning magnetically coupled resonant wireless power system based on magnetic amplifier is proposed in this paper.Firstly,the theoretical model of the two-coil magnetically coupled resonant wireless power system is established,and the factors affecting the transmission efficiency are analyzed.A Wireless power transfer via magnetic resonance coupling system is designed,and the correctness of the theory is verified by experiments.The finite element simulation of the magnetic amplifier is carried out,and its control characteristics are analyzed.The operating frequency of the system is determined by particle swarm optimization(PSO),and the control strategy based on improved local search algorithm is designed.The simulation system of magnetically coupled resonant wireless power system based on magnetic amplifier is established,and the experimental platform is built.Simulation and experimental results show that the adaptive tuning method of magnetically coupled resonant wireless power system based on magnetic amplifier can achieve smooth and continuous tuning of the system and ensure the high efficiency and stable operation of the system.