| The battery energy storage system has the advantages of small size,flexible installation and other advantages,which is widely used in distributed power generation system of new energy and new energy vehicles and other areas.As the link between the grid and the energy storage system,the three-phase bi-directional converter is charged with the function of charging and power feedback,which is one of the research on the key technology of the energy storage system.Therefore,the research has important significance for three-phase bidirectional converter energy storage system.Firstly,The paper write design requirements and topology of the three-phase bidirectional converter,and the SVPWM modulation algorithm of the three-phase AC/DC inverter.Then research the grid control strategy of bidirectional converter,and put a method to judge the phase sequence of three-phase,and design base on qd-transform all digital phase locked loop.The based on double voltage loop control strategy is studied,which has the advantages of simple structure,adjustable amplitude,good dynamic performance and low total harmonic(THD)output voltage.Through the establishment ??-and qd-of mathematical model of three-phase SVPWM rectifier in the coordinate system,research based on ??-coordinate transform and based on double loop three-phase rectifier current feed control strategy,realize unit power factor operation,and low harmonic current control.Hardware system include power supply circuit,main control circuit,design of IGBT driving circuit and sampling circuit design.software system include SVPWM digital modulation algorithm,PI algorithm,PLL program,passive and grid connected program.Finally,according to the design scheme to build a bidirectional converter experiment platform based on TMS320F28035.In the debugging process,the simulation and experimental results show that the control strategy and the design method is correct and effective.The basic functions of bidirectional converter are realized. |
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