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Abstract and Applied Analysis
Volume 2013 (2013), Article ID 371064, 8 pages
Research Article

Extension Sliding Mode Controller for Maximum Power Point Tracking of Hydrogen Fuel Cells

Department of Electrical Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan

Received 12 May 2013; Accepted 25 June 2013

Academic Editor: Chang-Hua Lien

Copyright © 2013 Meng-Hui Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Fuel cells (FCs) are characterized by low pollution, low noise, and high efficiency. However, the voltage-current response of an FC is nonlinear, with the result that there exists just one operating point which maximizes the output power given a particular set of operating conditions. Accordingly, the present study proposes a maximum power point tracking (MPPT) control scheme based on extension theory to stabilize the output of an FC at the point of maximum power. The simulation results confirm the ability of the controller to stabilize the output power at the maximum power point despite sudden changes in the temperature, hydrogen pressure, and membrane water content. Moreover, the transient response time of the proposed controller is shown to be faster than that of existing sliding mode (SM) and extremum seeking (ES) controllers.