A hybrid electric propulsion system

Abstract

The embodiment of the present invention discloses a hybrid electric propulsion system, which includes: a power supply module, including a fuel cell unit and a storage battery unit, and the power supply module is used to supply power to a DC bus; a converter module, including a first DC / DC converter unit and a second DC / DC converter unit. Two DC / DC converter units, the fuel cell unit is connected to the DC bus through the first DC / DC converter unit; the battery unit is connected to the DC bus through the second DC / DC converter unit; energy comprehensive management module, energy comprehensive management module Connected with the power supply module and the converter module, the comprehensive energy management module is used to control the conduction state of the converter module, and the comprehensive energy management module is also used to allocate the energy output of the fuel cell unit and the storage battery unit according to the mode signal or speed signal. The technical solution provided by the embodiment of the present invention improves the stability of the power system, ensures the use characteristics and service life of the devices on the ship, and improves the effect of energy saving and emission reduction.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of ship power supplies, in particular to a hybrid electric propulsion system. Background technique [0002] Ships are the main means of transportation at sea. The existing technology usually uses diesel engines, steam turbines or gas turbines as the main power source according to the tonnage and use of the ships. Diesel engines, steam turbines and gas turbines all use combustion to generate energy. This process is accompanied by A large amount of pollutants are discharged, and the energy conversion efficiency is not high. For this reason, higher requirements are put forward for the research on the ship's power supply system and power supply strategy. [0003] In view of the above problems, a hybrid power supply system is currently proposed, which includes a plurality of power modules connected in series, each of which includes a hydrogen fuel cell unit and a lithium ion battery unit, a...

AI Technical Summary

Problems solved by technology

Hydrogen fuel cells have the characteristics of no pollution, low noise and high efficiency, thus solving the problem of pollutant discharge and low energy conversion efficiency

However, in the end, the hydrogen fuel cell unit outputs externally, and the lithium-ion battery no longer outputs externally. When the output of the power module is not enough to maintain the output current, the power module cuts off the external output, which will cause the instability of the power system and affect the use of devices on the ship. characteristics and service life, can not achieve effective energy saving and emission reduction

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