Transient modeling method for hydrogen circulating pump in fuel cell system

Abstract

The invention discloses a transient modeling method for a hydrogen circulating pump in a fuel cell system, and the method comprises the steps: carrying out the fitting of a model based on a polynomial regression method, obtaining a relation function of the flow, rotating speed and outlet pressure of the hydrogen circulating pump, coupling an inertia link of a drive motor, and constructing a complete transient centrifugal hydrogen circulating pump model; and finally, performing PID control on the control voltage of the driving motor, obtaining the transient response of the hydrogen circulating pump through coupling calculation of the three models, controlling the hydrogen circulating pump to meet the tail gas recycling requirement of the fuel cell stack, and therefore, the purpose of controlling the hydrogen circulating pump is achieved. The model obviously improves the calculation rate on the premise of ensuring the simulation accuracy, can be used for calculating the working condition of the fuel cell stack in a steady state, can also simulate and calculate the real-time transient response during the variable load of the electric pile under the actual road working condition, can better carry out linkage simulation with the fuel cell system, and the method has important significance for optimizing the control strategy of the fuel cell system.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a transient modeling method for a hydrogen circulation pump in a proton exchange membrane fuel cell. Background technique [0002] In recent decades, the negative impact of air quality has been an urgent international problem, of which motor vehicle exhaust pollution accounts for a large proportion. In order to improve the air quality of cities, proton exchange membrane fuel cells have attracted the attention of many countries. It has become an important direction for the development of new energy vehicles. [0003] The fuel used by fuel cell vehicles comes from hydrogen stored in high-pressure hydrogen tanks. If the amount of hydrogen provided by the vehicle fuel cell is reduced, or even in short supply, it will cause irreversible damage and performance degradation to the battery stack. Therefore, a certain amount of hydrogen must be guaranteed to maintain the operation ...

AI Technical Summary

Problems solved by technology

If the amount of hydrogen provided by the vehicle fuel cell is reduced or even in short supply, it will cause irreversible damage and performance degradation to the battery stack

Therefore, a certain amount of hydrogen must be guaranteed to maintain the operation of the battery stack, but if the hydrogen recovery subsystem is not installed, the unreacted hydrogen will be directly discharged into the environment

The waste of fuel will not only increase the cost of use and reduce the cruising range, but the key point is that there will be safety problems

In addition, in order to obtain better performance, the hydrogen at the anode inlet of the battery stack often needs to be humidified, and the humidifier will increase the volume and cost of the system, and the residual liquid water in the humidifier will freeze below zero, affecting the cold start of the fuel cell speed

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