Ship hybrid power propulsion system based on active front-end frequency conversion technology

Abstract

The present invention discloses a ship hybrid power propulsion system based on an active front-end frequency conversion technology. The system comprises a speed change generating set, an energy storage device, a transformer, a direct current distribution board, a propulsion motor, a constant voltage and constant frequency inversion module and an energy management system device. The speed change generating set is connected with a first active front-end rectifying device; a voltage regulation module and a second active front-end rectifying device are connected between the energy storage device and the transformer; the propulsion motor is connected with a motor inversion module; and air breakers are employed to connect the energy storage device with the voltage regulation module, to connect the first active front-end rectifying device with the energy storage device, to connect the first active front-end rectifying device with the direct current distribution board and to connect the secondactive front-end rectifying device with the direct current distribution board. The ship hybrid power propulsion system solves harmonic pollution, improves power supply conversion efficiency, improvesthe load rate of the generating set and achieves purposes of energy saving and emission reduction, reduction of cost and improvement of ship safety.

Description

technical field [0001] The invention relates to a ship hybrid propulsion system based on active front-end frequency conversion technology. Background technique [0002] Compared with conventional diesel engine propulsion, electric propulsion ships have the characteristics of energy saving, good maneuverability, and flexible layout. With the development of power electronics technology, more and more ships use electric propulsion. Electric propulsion ships generally use AC diesel generators to provide power, and supply power to phase-shifting transformers and AC-DC inverters through the AC switchboard, and the variable-frequency motor drives the propeller to provide power for the ship. Because the power of the propulsion motor of the electric propulsion ship is relatively large, the ratio of the capacity of the propulsion motor to the power of the ship's power station has reached more than 0.5, and some even reached 0.8. The application of high-power frequency converters has b...

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Problems solved by technology

[0005] At present, almost all ships use fixed-speed diesel generator sets as power sources. However, due to the characteristics of diesel engines, when the load rate is 85-90%, the combustion is more complete, the efficiency is the highest, and the fuel consumption rate is the lowest. When the load rate decreases, the efficiency decreases. increased fuel consumption

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