Power distribution method of hydrogen-electricity hybrid power system

Abstract

The invention provides a power distribution method of a hydrogen-electricity hybrid power system, and belongs to the technical field of fuel cell automobiles and ships. The number of wavelet decomposition layers and the cut-off frequency of low-pass filtering are associated with the limit variable load rate of the fuel cell by using a Fourier series decomposition method to realize power matching of the fuel cell, so that the fuel cell bears a low-frequency power part, and the auxiliary power supply bears a high-frequency power part; an SOC closed-loop control strategy is adopted to superpose a fine tuning quantity to the output power of the fuel cell, so that an auxiliary power supply is controlled within a normal range, reliable operation of a power system is further ensured, and the control difficulty is reduced.

Description

technical field [0001] The invention belongs to the technical field of fuel cell vehicles and ships, and in particular relates to a power distribution method for a hydrogen-electric hybrid power system. Background technique [0002] The increasing scarcity of fossil energy and the problem of exhaust emissions have made new clean energy gradually enter people's field of vision. Proton exchange membrane fuel cells (PEMFCs) have many advantages such as zero emission, high power density, fast start-up speed, low operating temperature, and high energy conversion efficiency, and have been widely concerned and applied in the field of transportation. [0003] Proton exchange membrane fuel cell is an electrochemical power generation device using hydrogen as fuel and oxygen as oxidant. At the anode of the stack, the hydrogen loses electrons and converts into protons through the oxidation reaction, and reaches the cathode through the proton exchange membrane, and generates product wat...

AI Technical Summary

Problems solved by technology

This hydrogen-electric hybrid system not only overcomes the disadvantages of slow dynamic response and weak ripple tolerance of fuel cells, but also overcomes the problem of short cruising range of pure electric vehicles.

However, the design mode of multi-level energy sources also introduces new problems, that is, the problem of power distribution of the system. An unreasonable power distribution strategy will not only increase the hydrogen consumption of the system, but also greatly accelerate the performance degradation of the fuel cell and the failure of the auxiliary power supply. Therefore, it is of great significance to seek an optimized power allocation strategy to improve the overall performance of the system and reduce system cost

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