The Research Of V2G Bi-charging Technology Based On Matrix Converter

V2G technology which is an important part of the smart grid reflects the bidirectional energy flow between grid and electric vehicles.The bidirectional power converter device is the key to achieve V2G technology.The Matrix AC/DC converter can make the energy flow in two-way and have small input current harmonics,compact structure and higher power desity etc.,so this paper uses Matrix AC/DC converter as the implementation V2G power conversion devices.The input-output performance of AC/DC matrix converter depends on the modulation mode of systerm,the core issue of the modulation mode is configuration issues of zero vector,so in three zero vector modulation mode,AC/DC converter output current matrix ripple effects were studied,and this paper has a deep study inthe AC/DC converter narrow pulse with using a four-step commutation.Design the control system of 2kW AC/DC matrix converter prototype depending on DSP 28335 and FPGA EP1C12Q240C8N.Verify the correctness of research strategy by the theoretical analysis,simulation and prototype experiment.Experimental results show that output current ripple and modulation m have a parabolic curve relationship in modulation range from 0 to 1 of AC/DC matrix converter.In this three zero vector modulation modes,the output current ripple of double-zero vector modulation mode is minimized,the output current ripple of single vector modulation mode is maximum.So in the case of that the output filter inductor value is determined,the inductor current ripple can be reduced by the rational allocation of zero vector position size.The four-step commutation may cause narrow pulse problems.The way to solve this problem is to use the segmented modulation mode or to shorten commutation time in order to have a better performance of V2G converter...