Transient Modeling Method of Hydrogen Circulation Pump in Fuel Cell System

Abstract

The invention discloses a transient modeling method for a hydrogen circulating pump in a fuel cell system. The model is fitted with a polynomial regression method to obtain the relationship function of the hydrogen circulating pump flow, rotational speed and outlet pressure, and then coupling the inertial link of a driving motor to construct a complete The transient centrifugal hydrogen circulating pump model is based on the model, and finally the control voltage of the driving motor is controlled by PID. The three models are coupled to calculate the transient response of the hydrogen circulating pump, and the hydrogen circulating pump is controlled to meet the exhaust gas recovery requirements of the fuel cell stack. This achieves the purpose of controlling the hydrogen circulation pump. Under the premise of ensuring the accuracy of simulation, the model significantly improves the calculation rate. It can not only be used to calculate the fuel cell stack under steady-state conditions, but also to simulate the real-time calculation of the stack under load changes under actual road conditions. The transient response can be better simulated with the fuel cell system, which is of great 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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