A tree converter and control method for electrically powered load carrying systems

Abstract

The application discloses a tree-shaped converter and control method for an electric load carrying system, belongs to the application field of power electronics technology in electric load carrying engineering, and comprises a medium-voltage direct-current port, a cascade half-bridge converter, a low-voltage direct-current port and a coordination controller; the cascade half-bridge converters of different power levels are cascaded at the capacitor of the half-bridge submodule to form a multi-stage direct-current converter structure; the low-voltage direct-current bus of different voltage levels can be constructed, and the power transmission from the medium-voltage direct-current port to multiple low-voltage direct-current buses can be realized; the coordination controller can realize the unbalanced power transmission of the medium-voltage direct-current port to the low-voltage direct-current ports at all levels and the fault-tolerant operation control of the tree-shaped converter. The application can solve the demand of the electric load carrying system for multi-port direct-current power distribution, has high modularity, high power density and high extensibility, can improve the performance of the power distribution subsystem of the electric load carrying system, and can be used in the direct-current regional power distribution specific application scenarios of high-power electric ships, electric aircrafts and rail trains.

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