Control of oxygen excess ratio in a PEM fuel cell system using high-order sliding-mode controller and observer

Authors : Seyed Mehdi RAKHTALA, Abolfazl Ranjbar NOEI, Reza GHADERI, Elio USAI

Pages : 255-278

Doi:10.3906/elk-1301-90

View : 7 | Download : 6

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The main objective of this manuscript is to design a high-order sliding-mode observer to provide finite time estimation of unmeasurable states insert ignore into journalissuearticles values(x4: oxygen mass, x5: nitrogen mass); together with the oxygen excess ratio insert ignore into journalissuearticles values(ratio of the input oxygen flow to the reacted oxygen flow in the cathode);. This is done by applying second-order sliding modes through either super twisting or suboptimal controllers to control the proton exchange membrane fuel cell`s breathing. The estimated oxygen excess ratio is controlled in a closed-loop system using 2 distinct sliding-mode approaches: a cascaded super twisting controller and a single-loop suboptimal structure. Simulation results are presented to make a quantitative comparison between the cascade and the single-loop configuration. The results verify that the cascade provides accurate reference tracking while the single-loop presents faster convergence.
Keywords : Proton exchange membrane fuel cell, oxygen excess ratio, high order sliding mode observer, cascade control, second order sliding mode