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Energies 2014, 7(7), 4498-4518; doi:10.3390/en7074498

Gain Scheduling Control of an Islanded Microgrid Voltage

1
Department of Systems Engineering & Control, University of the Basque Country (UPV/EHU), Europa Plaza 1, E-20018 Donostia, Spain
2
Research Division of Ecole Supérieure des Technologies Industrielles Avancées (ESTIA), Technopole Izarbel, 64210 Bidart, France
3
Department of Electrical Engineering, University of the Basque Country (UPV/EHU), Europa Plaza 1, E-20018 Donostia, Spain
*
Author to whom correspondence should be addressed.
Received: 19 May 2014 / Revised: 20 June 2014 / Accepted: 4 July 2014 / Published: 14 July 2014
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Abstract

The aim of this research study has been to design a gain scheduling (GS) digital controller in order to control the voltage of an islanded microgrid in the presence of fast varying loads (FVLs), and to compare it to a robust controller. The inverter which feeds the microgrid is connected to it through an inductance-capacitor-inductance (LCL) filter. The oscillatory and nonlinear behaviour of the plant is analyzed in the whole operating zone. Afterwards, the design of the controllers which contain two loops in cascade are described. The first loop concerns the current control, while the second is linked to the voltage regulation. Two controllers, one defined as Robust and another one as GS controller, are designed for the two loops, emphasizing in their robustness and their ability to damp the oscillatory plant behaviour. To finish, some simulations are carried out to study and compare the two kinds of controllers in different operating points. The results show that both controllers damp the oscillatory behaviour of the plant in closed loop (CL), and that the GS controller ensures a better rejection of current disturbances from FVLs. View Full-Text
Keywords: isolated microgrid; inverters; nonlinearity; fast varying loads; gain scheduling; robust control isolated microgrid; inverters; nonlinearity; fast varying loads; gain scheduling; robust control
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MDPI and ACS Style

Camblong, H.; Etxeberria, A.; Ugartemendia, J.; Curea, O. Gain Scheduling Control of an Islanded Microgrid Voltage. Energies 2014, 7, 4498-4518.

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