Second order sliding mode control of the moto-compressor of a PEM fuel cell air feeding system, with experimental validation
ABSTRACT Fuel cells are electrochemical devices that convert the chemical energy of a gaseous fuel directly into electricity. They are widely regarded as potential future stationary and mobile power sources. The response of a fuel cell system depends on the air and hydrogen feed, flow and pressure regulation, and, heat and water management. In this paper, the study is concentrated on the air subsystem that feeds the fuel cell cathode with oxygen. An IP control, a RST regulator and a higher order sliding mode control, super-twisting algorithm, with variable gains, have been designed and validated experimentally to control the air flow of the moto-compressor system, composed of a DC motor driving a volumetric compressor of type piston, designed to feed a 500 W fuel cell with air. Experimental results show better performance with the sliding mode control, especially when dealing with a delayed air flow sensor response.
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ABSTRACT: This paper presents the oxygen stoichiometry control problem of proton exchange membrane (PEM) fuel cells and introduces a solution through an optimal control methodology. Based on the study of a non-linear dynamical model of a laboratory PEM fuel cell system and its associated components (air compressor, humidifiers, line heaters, valves, etc.), a control strategy for the oxygen stoichiometry regulation in the cathode line is designed and tested. From a linearised model of the system, an LQR/LQG controller is designed to give a solution to the stated control problem. Experimental results show the effectiveness of the proposed controllers design.Journal of Power Sources 01/2011; 196(9):4277-4282. · 4.68 Impact Factor
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ABSTRACT: In this paper, we have applied sliding mode extremum seeking control for optimizing the net power output of a Polymer Electrolyte Membrane Fuel Cell (PEMFC). The output of a PEMFC is regulated by controlling the air, which is supplied through a compressor. The control objective is to ensure that the the oxygen excess ratio is maintained between 2 and 2.4, while the power consumed by the compressor is kept at minimum. The proposed control strategy is based on an improved extremum seeking control technique, based upon second order sliding mode control. This allows the controller to respond to sudden changes in load. Simulation results show the effectiveness of the applied control technique.01/2012;
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ABSTRACT: In this paper, we have presented a novel cascade scheme to control the moto-compressor of a Polymer Electrolyte Membrane Fuel Cell (PEMFC). The control objective is to operate the PEMFC at its optimal power output, which is achieved by maintaining the oxygen excess ratio between 2 and 2.4. The proposed control strategy is based on two cascaded adaptive second order sliding mode controllers which regulate the compressor speed in response to oxygen excess ratio error (Fig.1). The compressor speed is determined from its position using an adaptive super twisting differentiator. The use of adaptive controllers provides better results than fixed parameter super twisting control, as it has less chattering, and better transient performance under load variations and parametric uncertainties. These results have been obtained from simulation, and have been presented in the paper. The effectiveness of this controller is evident in the results.Decision and Control (CDC), 2012 IEEE 51st Annual Conference on; 01/2012