An adaptive observer design for recirculation based solid oxide fuel cell systems using cell voltage measurement

In this paper we present an observer design for species concentration estimation in recirculation based solid oxide fuel cell systems. The proposed strategy is useful for sensor reduction and control. In designing the observer, we attempt to reduce the number of required concentration sensors, that are often less reliable and also expensive, and instead use readily available voltage. We design a nonlinear adaptive observer based on voltage measurement that is an improvement upon our prior results. For this observer, we prove ultimate boundedness of state and parameter estimation errors with arbitrarily small error bounds.