Research On AC/DC Hybrid Multi-Port Converter Based On High Frequency Link TSMC

Multi-port converter(MPC)can realize power transmission and control between multi port through an integrated method,which can be used as the interface between energy sources and load.Multi-port converter can improve the flexibility of the system.It has the advantages of small size,high efficiency and low cost,and has been found more and more applications in the new energy hybrid power supply system,spacecraft power supply system,microgrid power supply systerm,etc.With the continuous development of power electronics,there are higher requirements for multi-port converters in terms of space volume,conversion efficiency and reliability.High frequency link two-stage matrix converter(TSMC)has some attractive features such as less conversion stages,bidirectional power flow,sinusoidal input/output waveform,controllable input power factor,high conversion efficiency and high power density,which have been widely concerned.In this paper,a multi-port converter based on high frequency link TSMC has been proposed,the proposed topology combines the high-frequency link TSMC and transformer magnetically coupled multi-port converters.This topology utilizes the magnetic coupling of multi winding high frequency transformer to expand multiple ports,and can provide AC-DC hybrid ports.At the same time,the proposed topology inherits the advantages of high frequency link TSMC,so it has a wide range of application prospects and research value.The research significance and status of multi-port converter and high frequency link matrix converter are introduced in this paper.The three port high frequency link TSMC topology is proposed,introduces its basic structure and characteristics.The bipolar space vector modulation strategy of high-frequency link TSMC and phase shift control strategy of single phase H Bridge are analyzed.Then,the commutation strategy of high-frequency link TSMC is studied.The influence of the insertion of leakage inductance commutation time of high-frequency link TSMC on the input current and output voltage/current of high-frequency chain TSMC is given.The optimized commutation strategy of high-frequency link TSMC inverter stage is proposed,which can effectively reducing High-frequency chain TSMC input current and output voltage/current distortion rate.In this paper,a direct drive wind power generation system based on three port high frequency link TSMC is proposed,and its control strategy is studied.The system has the functions of variable speed constant frequency operation,maximum wind energy tracking,grid connected active/reactive power decoupling control and so on.At the same time,the system has has strong ability of power grid smoothing and low voltage ride through.Finally,a direct drive wind power system model based on three port high frequency link TSMC is built,and the correctness of the proposed topology,modulation strategy and control strategy is verified by simulation.