Output Voltage Regulation of a Fuel Cell/Boost Converter System: A PI-PBC Approach
In this paper we consider the problem of voltage regulation of a proton exchange membrane fuel cell connected to an uncertain load through a boost converter. We show that, in spite of the inherent nonlinearities in the current-voltage behaviour of the fuel cell, the voltage of a fuel cell/boost conv...
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Zusammenfassung: | In this paper we consider the problem of voltage regulation of a proton
exchange membrane fuel cell connected to an uncertain load through a boost
converter. We show that, in spite of the inherent nonlinearities in the
current-voltage behaviour of the fuel cell, the voltage of a fuel cell/boost
converter system can be regulated with a simple proportional-integral (PI)
action designed following the {Passivity-based Control (PBC) approach. The
system under consideration consists of a DC-DC converter interfacing a fuel
cell with a resistive load. We show that the output voltage of the converter
converges to its desired constant value for all the systems initial conditions
-- with convergence ensured for all positive values of the PI gains. This
latter feature facilitates the, usually difficult, task of tuning the gains of
the PI. An Immersion and Invariance parameter estimator is afterwards proposed
which allows the operation of the PI-PBC when the load is unknown, maintaining
the output voltage at the desired level. The stable operation of the overall
system is proved and the approach is validated with extensive numerical
simulations considering real-life scenarios, where a robust behavior in spite
of load variations is obtained. |
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DOI: | 10.48550/arxiv.2302.08697 |