The performance of thermal based modified solid oxide fuel cell (SOFC) model under different DC load conditions
Abstract
In this paper, a thermal-baseddynamic model of a Solid Oxide Fuel Cell under different direct current loadconditions is improved by using our previous developed fuel cell model, whichincludes ohmic, activation and concentration voltage losses, thermal dynamics,and methanol reformer. The modified SolidOxide Fuel Cell model covers restriction of fuel utilization factor. Hence, the voltage and power of the Solid OxideFuel Cell stack are limited to avoid excessive fuel flow and temperature. The SolidOxide Fuel Cell model is developed in a Matlab/Simulink environment and testedfor different direct current load conditions, which are step, ramp, random and stair-caseloads. The simulation results show that the modified Solid Oxide Fuel Cellmodel can be used to precisely follow the direct current load variations. Thisis true because reaching thesteady state of the system takes a shorter time for the ramp load, and takes a longertime for the step load. Besides, the limitation of the fuel utilizationfactor can be seen more clearly from the system with the stair-case load.References
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