Abstract
This paper presents a Proton-Exchange Membrane Fuel Cell (PEMFC) transient model in stack current cycling conditions and its partial optimal control. The derived model is used for a specific application of the recently published multistage control technique developed by the authors. The presented control-oriented transient PEMFC model is an extension of the steady-state control-oriented model previously established by the authors. The new model is experimentally validated for transient operating conditions on the Greenlight Innovation G60 testing station where the comparison of the experimental and simulation results is presented. The derived five-state nonlinear control-oriented model is linearized, and three clusters of eigenvalues can be clearly identified. This specific feature of the linearized model is known as the three timescale system. A novel multistage optimal control technique is particularly suitable for this class of systems. It is shown that this control technique enables the designer to construct a local LQR, pole-placement or any other linear controller type at the subsystem level completely independently, which further optimizes the performance of the whole non-decoupled system.
Highlights
Proton-Exchange Membrane Fuel Cells (PEMFC) are devices that convert the energy of electrochemical reactions to electrical energy
This paper provides a control-oriented framework to study PEMFC and it is consisted of two parts: 1
Nonlinear model simulation is run for stack current step from Ist = 25A to Ist = 30A and compared with experimental data-log for the same stack current step
Summary
Proton-Exchange Membrane Fuel Cells (PEMFC) are devices that convert the energy of electrochemical reactions to electrical energy. PEMFC is seen as a promising power source of the future, as an alternative to internal combustion engines and batteries, mainly because the only byproduct of the electrochemical reaction is water. Wide commercialization of such devices could reduce the greenhouse gas emissions, associated with transportation. The major bottlenecks for wider commercialization of PEMFC have cost and durability nature. Such systems operate sufficiently well on a fraction of their lifetime and the performance decreases. There is an emerging need for taking a constructive control-oriented approach to PEMFC modeling and developing new control strategies
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