Power splitting method for electric vehicle hybrid power source fuel cell hybrid energy system

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...

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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 the fuel cell in the prior art, unilateral excessive discharge of the storage battery, and insufficient performance of the "peak-shaving and valley-filling" effect of the supercapacitor;

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