A series type direct current power distribution device and control method for an electric vehicle system

Abstract

This invention discloses a series-type DC power distribution device and control method for electric transportation systems, belonging to the application field of power electronics technology in electric transportation engineering. This series-type DC power distribution device is based on a cascaded bridge circuit topology. Through a series bridge power electronic interface, it converts medium-voltage DC voltage into multiple low-voltage DC voltages, connecting to unidirectional or bidirectional port converters, and then connecting different types of loads. This enables flexible bidirectional power flow control between a single medium-voltage DC port and multiple low-voltage DC ports. A coordinating controller can achieve power imbalance operation control and fault-tolerant operation control of the low-voltage DC ports. This invention eliminates the need for a medium-voltage DC converter in high-power electric transportation systems, improving modularity and power density. It is suitable for specific application scenarios of DC regional power distribution and propulsion system power supply for high-power electric ships, electric aircraft, and rail trains.

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