Proton exchange membrane fuel cell humidity control method based on auto-disturbance-rejection control method

Abstract

The invention discloses a proton exchange membrane fuel cell humidity control method based on an auto-disturbance-rejection control method. The method comprises the following steps: step 1, establishing a PEMFC dynamic water management model which mainly comprises a cathode water balance model, an anode water balance model, a membrane hydration model and a voltage model; step 2, performing humidity control on the dynamic water management model of the fuel cell by means of the anti-interference performance and the inhibition performance of an auto-disturbance-rejection control technology, and adjusting the working humidity of the cell by controlling the air inlet humidity of a cathode; and step 3, carrying out simulation analysis by using Matlab and Simulink, and comparing the humidity control of the auto-disturbance-rejection control technology with the humidity control of the traditional PID control and fuzzy PID control method. Compared with a traditional PID controller and a fuzzy PID controller, an auto-disturbance-rejection controller improves the anti-interference and tracking control performance of the humidity of the proton exchange membrane fuel cell, has higher control precision, higher response speed and smaller overshoot, and can better meet the control requirement.

Description

Technical field: [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a humidity control method for proton exchange membrane fuel cells based on an active disturbance rejection control method. Background technique: [0002] Proton exchange membrane fuel cell is one of the most widely used fuel cells at present. The water content of a proton exchange membrane fuel cell plays a key role in its electrical conductivity. Too low a water content causes the membrane to dry out, increasing the ionic resistance and ohmic losses, and exacerbating the voltage drop. Too high a water content can lead to "water flooding", blocking the porous channels and reducing the transport rate of reactants to the catalyst sites. Improper humidity conditions will not only reduce the performance and efficiency of fuel cells, but even cause irreversible degradation of internal components such as catalysts or membranes. This will cause the catalyst to come...

AI Technical Summary

Problems solved by technology

However, in a PEM fuel cell dynamic system, it is challenging to control the water content in the membrane due to many interrelated variables, such as mass transfer phenomena, operating temperature, relative humidity of the inlet gas, etc.

In the dynamic process, the internal parameters of the proton exchange membrane fuel cell have strong nonlinearity and uncertainty, which brings great difficulties to water management control

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