A multi-port converter for electric vehicle cluster charging and discharging and its control method

Abstract

The invention discloses a multi-port converter for electric automobile cluster charging and discharging and a control method of the multi-port converter. The multi-port converter is characterized in that the multi-port converter is totally provided with n ports; (n-1) ports from the first port to the (n-1)th port in the n ports are respectively used for being connected with an electric automobile battery; and the n-th port in the n ports is used for being connected with a direct current bus in a direct current micro grid. The control method of the multi-port converter is characterized in that the duty ratio of each switch tube is obtained through calculation; driving pulses corresponding to each switch tube are formed by utilizing the duty ratio obtained through calculation for controlling the on-off state of each switch tube; and the discharging control and the charging control on the electric automobile battery are further realized. The multi-port converter and the control method are used for electric automobile cluster charging and discharging control, and the interaction function between an electric automobile and an electric network is fully achieved.

Description

technical field [0001] The invention relates to a multi-port converter for electric vehicle cluster charging and discharging and its control method Background technique [0002] With the continuous improvement of the penetration rate of electric vehicles, how to integrate electric vehicles to give full play to their advantages and use the interactive functions of electric vehicles and the grid to provide some auxiliary services for the grid, such as peak shaving, frequency regulation and spinning reserve, has become an issue of increasing concern. The traditional method is to integrate electric vehicles and renewable energy in the form of micro-grids, such as DC micro-grids, AC micro-grids or AC-DC hybrid micro-grids, and then connect them to the large power grid, in which each electric vehicle has a corresponding independent power converter. Therefore, this method has some disadvantages: each electric vehicle needs to realize power conversion through the corresponding powe...

AI Technical Summary

Problems solved by technology

However, there are still few proposed multi-port converter topologies for EV cluster charging and discharging.

Moreover, as far as the existing multi-port converters for electric vehicle cluster charging and discharging are concerned, it can only realize simultaneous charging or simultaneous discharging of all integrated electric vehicles in a single multi-port converter module, but cannot realize partial EV charging, some EV discharging

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