Research On The Key Technology Of Medium Frequency And High-power Inductively Coupled Power Transfer

Inductively Coupled Power Transfer(ICPT)uses electromagnetic induction theory to transfer electric energy without wire.It mainly uses the electric energy conversion device to transform the conventional alternating current into the alternating current of thousands of hertz to hundreds of kilo-hertz frequency to transform electric energy through magnetic coupling.Compared to the traditional inserting or sliding contact type power supply,The advantages of ICPT is safe,convenient,flexible,maintenance free,strong environment adaptability etc.It is of great practical value to study ICPT system in the industrial field.It has the advantages of low stress,low magnetic field radiation,strong anti-interference ability,easy realization and high reliability to use intermediate frequency compared with high frequency to transform electric energy.In this paper,the application of ICPT system with intermediate frequency of industrial rail electric power transmission is introduced.The main contents of the study are as follows:1.Research on resonant converter:In this paper,the voltage phase shifted full bridge resonant converter is established through the demonstration of the scheme.Based on the analysis of the basic theory of ICPT technology,the resonant converter is modeled.The corresponding working states and experimental parameters of phase shifted full bridge are given with different phase shift angles.In this paper,the relationship between the turn-on angle of phase shifted full bridge and the harmonic current of the port is studied.The parameter design method to reduce the current harmonics of the port is given.2.Research on multi resonant network compensation:The paper analyzes two kinds of compensation forms of the series and parallel capacitance based on the series compensation capacitance of the track side.Based on the results,the system loss model is established.The design of electrical equipment and the optimization scheme of resonance compensation are put forward.The topological difference of the series and parallel resonant capacitors is analyzed.The finite element simulation results of the power plate based on MAXWELL are given and verified by experiments.3.Research on ICPT system carrier communication:The electromagnetic radiation of the track is large while the real time requirement of data transmission is high in the industrial rail wireless power transfer.It is necessary to study and design a communication scheme suitable for medium frequency and high power ICPT system.The proposed scheme can effectively modulate and demodulate the signal,and the signal can be transmitted reliably without affecting the energy transfer.4.Digital realization and experiment platform establishment:Design and build a set of ICPT system industrial prototype.The digital control and parameter design method of the resonant converter and the electrical equipment are given.The TMS320F23885 and PIC16F873 A are used as the main control chip,and the high power wireless energy transmission is realized.