Research On Three-Port Converter Based On Three Phase-Single Phase Matrix Converter

Multi-port converter?MPC?uses a single power converter to replace multiple independent power conversion units,realizes the combination of topology and function of multiple independent power conversion units.The centralized power conversion and control of multi-port converters improve the power density,transient response speed and reliability of power supply.With the in-depth study of multi-port converters,there are higher requirements on power density,conversion efficiency and stability.As a derivative topology of matrix converter,three-phase to single-phase matrix converter?3-1 MC?show their advantages on less series of power conversion,bidirectional flow of energy,high power density,easy modularization and expansion of structure.In this paper,a multi-port converter based on three-phase-single-phase matrix converter has been proposed,this topology can provide AC-DC hybrid port with single-stage power transmission,also has the advantages of matrix converter and multi-port.It solves the shortcomings of existing AC-DC hybrid multi-port converter in multi-stage power conversion.Firstly,the topology and status of high frequency link matrix converter and multi-port converter has described.The three-port based on three-phase to single-phase matrix converter topology has proposed.The coordinated modulation strategy based on bipolar space vector modulation strategy and phase shift modulation strategy are proposed.Then,the Y and?shaped equivalent model of three-port converter are established.The power transmission capability of the topology has analyzed in detail,and the mathematical relationship of power flow between the ports has derived.On this basis,the duty cycle relationship of three-phase to single-phase matrix converter partial space vector modulation under coordinated modulation strategy is given.The effects of phase shift,power transmission inductance and other factors on the transmission power between ports has analyzed.Additionally,an integrated charging system of electric vehicle based on three-port converter is proposed.According to the converter?equivalent circuit,the mathematical relationship between the three-phase to single-phase matrix converter input current and the control variables(?₁₂,?₁₃)was established.A new closed-loop control strategy,which used a fixed 3-1 MC modulation factor and the input current amplitude of the converter coordinated by the phase-shift angles?₁₂ and?₁₃,is proposed.The presented control strategy ensures the power independent control between the ports,the unit power factor operation on the net side and the battery subsection charge and discharge control is realized.Finally,the proposed topology and its modulation strategies are verified by simulation and experiment results.