Vehicle-mounted fuel cell and storage cell directly paralleled power system with super capacitor

Abstract

The invention relates to a vehicle-mounted fuel cell and storage cell directly paralleled power system with a super capacitor. The power system comprises a fuel cell galvanic pile, a fuel cell accessory system, a fuel cell controller, a storage battery group, a super capacitor group, a high voltage bidirectional DC / DC (direct current) converter, a small power unidirectional DC / DC converter, a motor controller, a driving motor and a system energy management controller, wherein a high voltage output end of the fuel cell galvanic pile is connected with an anode of a power diode through a high voltage switch K1, and the high voltage output end of the storage battery group is directly connected with a cathode of the power diode and the high voltage output end of the motor controller in parallel through a high voltage switch K2 to form a direct current bus. The super capacitor group is connected with the direct current bus through the high voltage bidirectional DC / DC converter, and the high voltage output end of the storage battery group is connected with the fuel cell accessory system through the small power unidirectional DC / DC converter. According to the system disclosed by the invention, a power supply mode in which galvanic pile output needs large power DC / DC voltage stabilization of a conventional fuel cell is abandoned, and the efficiency is improved; the instantaneous needed power of the direct current bus can be compensated by the arranged super capacitor group, the bus voltage is steadied, and braking energy can be quickly and effectively recycled.

Description

technical field [0001] The invention belongs to a hybrid power system of a fuel cell vehicle, in particular to a power system and a control method of a vehicle-mounted fuel cell with a supercapacitor directly connected in parallel with a storage battery. Background technique [0002] Fuel cell vehicles have the advantages of energy saving, environmental protection, high efficiency, stable operation and no noise, etc., and have become a hot spot in the research and development of a new generation of vehicles. In recent years, fuel cell vehicle technology has made significant progress, however, there are still technical challenges in the development process of fuel cell vehicles, such as the integration of fuel cell stacks, improving the fuel processor of commercialized electric vehicles, optimizing the power of fuel cell vehicles. system etc. Due to the poor performance of fuel cells in terms of peak power output capability and dynamic response of power output, auxiliary ene...

AI Technical Summary

Problems solved by technology

[0004] In the existing fuel cell vehicle hybrid power system, the output of the fuel cell or battery pack is connected to the DC / DC converter to supply power to the DC bus. The existence of the DC / DC converter not only reduces the power supply efficiency of the battery, but also its high frequency The way of chopping power is harmful to the battery

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