Robust nonlinear adaptive feedback linearizing decentralized controller design for islanded DC microgrids

This paper presents a robust nonlinear decentralized
control scheme for islanded DC microgrids where the main control
objectives are to maintain the desired voltage at the common DCbus and the power balance. The proposed control scheme uses
the partial feedback linearization scheme to simplify the dynamical
models of different components in DC microgrids. In this paper,
the DC microgrid includes a solar photovoltaic (PV) unit, fuel cell
system, and battery energy storage system (BESS) along with DC
loads. The robustness of the proposed controller against parametric
uncertainties is ensured by the parameter, appearing in the control
inputs as unknown which is then estimated through adaptation laws.
The inherent noise decoupling capability of the feedback linearization
scheme is used to provide robustness against external disturbances
in DC microgrids. The performance of the proposed controller is
evaluated on a DC microgrid through simulation and experimental
studies in order to demonstrate the effectiveness and robustness
under different operating conditions while considering the effects
of parametric uncertainties and external disturbances. Simulation
results are also compared with an existing proportional-integral (PI)
controller.