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. In this work, we address a coefficient diagram method (CDM) for designing temperature control available to an energy integrated solid oxide fuel cell (SOFC) system that the high temperature of SOFC exhaust gas can be a heat source for all heat exchangers in SOFC system. The SOFC system represents the multi-loop control system in which the key controlled variables are the SOFC, steam reformer and heat exchanger temperatures. For temperature control design, an air flow rate entering SOFC and a valve position of SOFC hot stream splitter are identified as the manipulated variables to regulate the main controlled variables of a SOFC temperature and a steam reformer temperature, respectively. By using the CDM, the stability and robustness for regulating the SOFC system temperatures were analyzed to offer the suitable control parameters and the simulation results showed that the designed temperature control of SOFC system provides a good performance to control the controlled variables and reject the disturbance.

Temperature Control of Solid Oxide Fuel Cell System with Coefficient Diagram Method