| Inductively Coupled Power Transfer(ICPT)technology is a modern energy transmission technology which integrates magnetic field coupling technology,high power and high frequency energy conversion technology,modern power electronics technology and so on.It uses modern control strategy to transfer energy from power supply to power supply by magnetoelectronic conversion.It has high efficiency,adaptability and reliability.At present,it has attracted widespread attention of researchers,and has been widely used in mobile phones,household appliances,coal mines,underwater,human body built-in equipment external power supply and other fields.With the development of ICPT technology,it is gradually possible for the same primary power supply device to provide wireless power for different electrical equipment.Different power supply equipment reacts to different load of the system,and the change of load will affect the input impedance of the system and change the output power efficiency characteristics of the system.The system needs to ensure efficient and reliable transmission according to different load sizes and power levels.At the same time,load identification and perception are the basis of the design and research of ICPT system.Therefore,ICPT system urgently needs a high-precision load identification method to achieve accurate control and improve system performance.Based on the superposition theorem and Fourier decomposition theory,a load identification method of fundamental-harmonic dual-channel parallel ICPT system is proposed in this paper.By adding harmonic channels to the traditional ICPT system,the parallel operation mode of the system is studied to achieve high-precision load parameter identification without affecting the normal transmission of energy.Firstly,this paper takes four basic reactive power compensation networks in the system as examples to analyze the influence of load changes on the resonant frequency of the system,thus affecting the output power and efficiency characteristics of the system;secondly,it analyses the defects and shortcomings of three existing load identification methods;secondly,based on the superposition theorem and Fourier decomposition theory,this paper proposes a fundamental-harmonic dual-pass method based on harmonic injection.The load identification method of parallel ICPT system is introduced in detail,and its working principle and mode are introduced.Based on the theoretical analysis results,the system simulation model is established by using MATLAB/Simulink to verify the original constant current characteristics and frequency selection characteristics of the system compensation network.Nine sets of loads are selected to verify the load identification method proposed in this paper.Finally,wireless power supply is built.The system hardware platform verifies the load identification method based on harmonic injection under different load conditions.Both simulation and experiment verify the correctness and effectiveness of load identification method based on harmonic injection.The research content of this paper has played a positive role in the further promotion of radio power transmission technology. |
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