Power dividing method of compound power source fuel cell hybrid energy system of electric automobile

A fuel cell and composite power supply technology, applied in electric vehicles, battery/fuel cell control devices, vehicle energy storage, etc., can solve the problems of insufficient supercapacitor performance of batteries and large power loss of fuel cells

Inactive Publication Date: 2018-04-13
JILIN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention proposes a power shunting method for a hybrid energy system of a composite power supply fuel cell to overcome the problems of large power loss of th...

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  • Power dividing method of compound power source fuel cell hybrid energy system of electric automobile
  • Power dividing method of compound power source fuel cell hybrid energy system of electric automobile
  • Power dividing method of compound power source fuel cell hybrid energy system of electric automobile

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Embodiment Construction

[0083] The present invention will be further described below by accompanying drawing:

[0084] figure 1 A schematic diagram of the composite energy system topology of fuel cell vehicles with composite power sources is given. This composite energy system includes fuel cell units, supercapacitor units, and battery units. Since both batteries and supercapacitors have good dynamic response characteristics, the battery It is connected in parallel with the supercapacitor to form a composite power supply, and the composite power supply is connected in parallel with the fuel cell to provide power for the vehicle. The battery-supercapacitor-fuel cell composite energy system proposed in this patent is defined as a composite power supply fuel cell hybrid energy system in this patent. The composite power fuel cell hybrid energy system also includes a fuel cell controller and a composite power controller. The fuel cell controller realizes power splitting between the fuel cell and the compo...

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Abstract

The invention provides a power dividing method of a compound power source fuel cell hybrid energy system of an electric automobile. The method includes the steps that firstly, when a fuel cell is started, a fuel cell controller acquires the fuel cell voltage at the initial moment and the fuel cell current at the initial moment and acquires the fuel cell voltage and the compound power source voltage at every next moment; secondly, a discrete prediction model of the compound power source fuel cell hybrid energy system is established, and the power of the fuel cell at the next moment is determined; and thirdly, the reference output power of a storage battery at the next moment and the reference output power of a super capacitor at the next moment are further determined, and power division isachieved. By the adoption of the method, the demanded power of the whole automobile is optimized and divided, the defect that the fuel cell is slow in dynamic response is overcome, meanwhile power losses of a compound power source are reduced, the work efficiency of the compound power source is improved, the dynamic property requirement of the automobile is met, and the driving mileage of the automobile is increased.

Description

technical field [0001] The invention belongs to the technical field of fuel cell electric vehicles, and in particular relates to a power splitting method of a composite power supply fuel cell hybrid energy system of a fuel cell vehicle with a composite power supply. Background technique [0002] Pure electric buses have a large mass at full load and high energy consumption during operation. However, due to the limitation of battery capacity, the driving range of pure electric buses is very limited, and deep discharge is inevitable; at the same time, instantaneous power is often required when starting and climbing Larger, the battery will be in a state of high current discharge. The deep charge and discharge of the battery and the state of high current charge and discharge will greatly reduce the life of the battery. [0003] To solve this problem, a more reasonable solution is to use batteries, supercapacitors, fuel cell composite energy systems, or their combination of two...

Claims

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Application Information

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IPC IPC(8): B60L11/18
CPCB60L50/40B60L58/40Y02T10/70
Inventor 宋大凤雷宗坤曾小华张峻恺李广含黄海瑞李立鑫王振伟崔皓勇董兵兵
Owner JILIN UNIV
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