Abstract
Nowadays, the temperature gradient is considered as one of the most important parameters which impact the performance of the solid oxide fuel cell (SOFC). In this paper, a control strategy based on an input–output feedback linearization technology is derived for controlling the maximum temperature gradient within the anode fuel flow channel at the desired value. For the controller design, the temperature dynamic model is proposed and simplified to a control-oriented multi-input and multioutput nonlinear dynamic model. Then, this paper presents an input–output feedback linearization controller to realize the control objective by adjusting the cathode input air flow. Finally, the simulation results are given to demonstrate the accuracy of the proposed model in reflecting the temperature dynamic characteristics. Moreover, the compound controller is added for simulation as a comparison, which shows that the proposed controller is equipped with better effectiveness and efficiency in the presence of external disturbances.
Highlights
The solid oxide fuel cell (SOFC) is an energy conversion device which directly converts chemical energy into electrical energy through an electrochemical reaction, and the chemical energy is stored in gas or gas fuel
This energy conversion jumps over the process of converting heat into mechanical energy, which brings the SOFC system not restricted by the Carnot cycle and has high energy conversion efficiency.[1]
To develop effective temperature gradient control strategies, a control-oriented nonlinear dynamic model of the SOFC is first proposed in this paper
Summary
The solid oxide fuel cell (SOFC) is an energy conversion device which directly converts chemical energy into electrical energy through an electrochemical reaction, and the chemical energy is stored in gas or gas fuel. Most of the mechanism models of the SOFC in the above research studies have fewer coupling elements They are very useful to analyze the dynamic performance but not suitable for designing control schemes of the complex SOFC system. To develop effective temperature gradient control strategies, a control-oriented nonlinear dynamic model of the SOFC is first proposed in this paper. To improve durability and prevent potential failures, a nonlinear controller based on the input−output feedback linearization is proposed to control the temperature gradient within the required range in this study.
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