Transient control is important for prolonging the life of SOFCs and broadening their applications. This paper develops an observer based method for transient control. The essential idea is to regulate the fuel cell current using the estimated state, incorporated within a steady-state invariant property of the SOFC. The objective is to directly address hydrogen starvation in SOFCs through control of transient fuel utilization. The method is demonstrated for two different SOFC systems. The applicability across configurations indicates the possible validity of this approach for SOFCs in general. The control design is supported by simulation results.

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