Optimization Control of SOFC Based on Bond Graph Model

Abstract

For the sustainable development of the environment, the Fuel cell is more and more popular in power generation because of its high efficiency and high capacity. Among them, the Solid Oxide Fuel Cell (SOFC) own the highest efficiency and is one of the best potential in the Fuel Cell. To optimize and control the SOFC system, building a detailed model of SOFC is very important. Thus, a SOFC stack model which includes transport processes, the electrochemical and chemical reactions is simulated and evaluated in this paper. This model is used on the Bond Graph theory, so it can simulate the energy conservation and flow in different physical domains. It is a transient model and has a rough distribution along the gas channel. First, the theory and dynamics of SOFC model were proposed. Second, the Bond Graph theory was briefly introduced and SOFC Bond Graph model was proposed. Finally, the SOFC stack was simulated in this paper. Characteristics of SOFC stack along gas channel with a load current was dynamic simulated. Power and Fuel utilization curves of SOFC at different H2 flow rate were simulated in this paper as well. The model and simulation are useful to the control of SOFC for the high efficiency of the SOFC system.