Dynamic Modeling and Control Design for a Planar Solid Oxide Fuel Cell

Abstract

In this paper, a preliminary control law, on the basis of the model-based analysis, is adopted to allow convenient integrations into a comprehensive power tracking control algorithm. The dynamic modeling methodology is employed to assess the dynamic responses of a SOFC stack under startup and load change conditions. The multi-disciplinary integration method is used to evaluate the stack characteristics. Effects of gas flow rates and differential temperatures between inlet flows and stack are investigated. In accordance with the stack specifications, the results will serve as a practical perception to minimize the heat input and shorten the startup time. While under load change conditions, proper air excess ratios are essential to stabilize the stack temperature profiles and to avoid the occurrence of abrupt temperature gradients in the stack.