W. Na and B. Gou (USA)
Polymer Electrolyte Membrane Fuel Cells, nonlinear dynamic model, exact linearization. II. PEM FUEL CELL DYNAMIC MODEL The following assumptions are applied to construct the simplified dynamic model for PEM FCs [3].
This paper presents a dynamic model of Polymer Electrolyte Membrane Fuel Cells (PEM FCs), and constructs a nonlinear control strategy for PEM FCs by using the exact linearization approach. By introducing additional outputs, the original multiple-input single-output (MISO) nonlinear model of PEM FC is transformed into a multiple-input multiple-output (MIMO) system so that the exact linearization approach can be directly utilized. The reformer is avoided in the control design for economical objective. Simulation results show that PEM fuel cells with nonlinear control have better transient and steady-state performances than linear controls. In this paper the nonlinear dynamic model for PEMFCs proposed in [13] is directly utilized to design a new control strategy for fuel cells without the use of reformer for the economical consideration. The exact linearization control approach transforms the original nonlinear dynamic model into a linear model by a diffeomorphism mapping, and then transforms back to the original nonlinear state-space the control law obtained from the exactly transformed linear system by linear optimal control approaches. The control law obtained from the exact linearization without the reformer is simpler than the one with reformer, and is expected to be more robust in the presence of large disturbances in a big range.
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