Composite power supply system energy distribution method considering fuel cell start-stop strategy

Abstract

The invention provides a composite power supply system energy distribution method considering a fuel cell start-stop strategy, and belongs to the field of fuel cells. The method has the advantages ofreducing the number of starting and stopping times of a fuel cell system, improving the system efficiency and prolonging the service life of a power supply. The method includes upper layer control andlower layer control. Upper layer control is used for controlling starting and stopping of a fuel cell, wherein electric quantity data of a storage battery and the load current of an automobile are collected, and starting and shutdown operation of the fuel cell is determined according to the current on-off state of the fuel cell and the electric quantity data of the storage battery. Lower layer control is used for controlling energy distribution, wherein energy distribution is carried out on a fuel cell module and a supercapacitor module according to the electric quantity, collected by a dataacquisition module, of the storage battery, the electric quantity, collected by the data acquisition module, of a supercapacitor and the current demand , collected by the data acquisition module, of aload.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to an energy distribution method of a composite power supply system considering a fuel cell start-stop strategy. Background technique [0002] In recent years, fuel cells have been widely used in the vehicle field due to their advantages of high efficiency and no pollution. Considering the shortcoming of the fuel cell's slow dynamic response, the fuel cell and other energy storage sources such as batteries and supercapacitors are used as composite energy sources. Supercapacitors have the advantages of high power density, and batteries have the advantages of high energy density. Therefore, it is especially important to design a fuel cell composite power system with high efficiency, long life and good reliability to give full play to the respective advantages of these power sources. [0003] The current fuel composite power system generally only includes two power supplies, espe...

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Problems solved by technology

[0003] The current fuel composite power supply system generally only includes two power supplies, especially in the energy management strategy, the damage caused by frequent switching to the fuel cell system is not considered, and the start-stop control of the fuel cell is not considered at the same time as the energy distribution of the composite power supply. The design of the energy management controller cannot fully meet the characteristics of fuel cells and other energy storage sources, which leads to the disadvantages of low efficiency of the composite power system and damage to the life of the battery system.

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