Fuel cell energy management method based on VMD processing

Abstract

The invention discloses a fuel cell energy management method based on VMD processing. The method comprises the steps that firstly, a fuel cell hybrid electric vehicle model is built to calculate the propulsion power and the demand power of a vehicle, a fuel cell system model is built to calculate the hydrogen consumption amount, a lithium battery model is built, and the SOC value of a lithium battery is calculated; decomposing the demanded power by using a variational mode decomposition method to obtain a plurality of mode functions with different frequency characteristics of the demanded power; finally, the SOC value of the lithium battery serves as input, the output power of the fuel battery serves as output, a fuzzy controller of the fuel battery hybrid power system is constructed, energy management is conducted on the fuel battery hybrid power system, and compared with an energy management control strategy without VMD conversion processing, the output power of the fuel battery can be stably changed, and the energy utilization rate of the fuel battery hybrid power system is improved. And the SOC value of the lithium battery can be maintained at 0.7, the service life of the fuel battery and the lithium battery can be effectively prolonged, and the power requirement can also be met for rapidly changing loads.

Description

technical field [0001] The invention relates to the field of battery energy management, in particular to a fuel cell energy management method based on VMD processing. Background technique [0002] With the rapid development of the world economy, the huge increase in energy consumption has led to the gradual depletion of fossil fuels, and environmental pollution has become increasingly serious. The energy crisis has led to a great deal of research on environmentally friendly energy sources. A fuel cell is a device that converts the chemical energy of fuel into electrical energy through an electrochemical reaction. According to the type of electrolyte, it can be divided into phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells, direct methanol fuel cells, and proton exchange. Membrane fuel cell, compared with other fuel cell types, proton exchange membrane fuel cell has fast start-up speed, low operating temperature, and almost zero emission. It is ...

AI Technical Summary

Problems solved by technology

[0006] In the topological structure of fuel cell + super capacitor, the fuel cell and super capacitor are used in parallel to supply power to the load. Compared with the auxiliary battery lithium battery, the super capacitor has a longer life and faster dynamic response, but in A bidirectional DC / DC converter needs to be added between the DC bus and the supercapacitor, which increases the difficulty of control. At the same time, because the stored energy of the supercapacitor is limited and the continuous working time is short, compared with the first topology certain defects

[0007] In the topological structure of fuel cell+auxiliary battery+supercapacitor, the supercapacitor can absorb the part of the power exceeding the average power, making the charging and discharging process of the auxiliary battery smoother and prolonging the service life of the auxiliary battery and the fuel cell, but this This topology is too complex, which increases the manufacturing cost for the whole system and greatly increases the difficulty of control.

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