A Distributed Control Scheme for Cyber-Physical DC Microgrid Systems

Adeniyi K. Onaolapo, Gulshan Sharma, Pitshou N. Bokoro, Anuoluwapo Aluko and Giovanni Pau ()
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Adeniyi K. Onaolapo: Department of Electrical Engineering Technology, The University of Johannesburg, Johannesburg P.O. Box 524, South Africa
Gulshan Sharma: Department of Electrical Engineering Technology, The University of Johannesburg, Johannesburg P.O. Box 524, South Africa
Pitshou N. Bokoro: Department of Electrical Engineering Technology, The University of Johannesburg, Johannesburg P.O. Box 524, South Africa
Anuoluwapo Aluko: Department of Electrical and Software Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
Giovanni Pau: Faculty of Engineering and Architecture, Kore University of Enna, 94100 Enna, Italy

Energies, 2023, vol. 16, issue 15, 1-17

Abstract: An innovative distributed secondary control technique for balanced current sharing and voltage regulation for an off-grid DC microgrid setup is presented in this research. The droop control scheme is conventionally used for current sharing amongst distributed sources (DSs) in a microgrid. However, this method has two major drawbacks. Firstly, due to the line resistance of each DS, the output voltage is different for each DS, and the output current-sharing property deteriorates. Secondly, the droop action increases the DC bus voltage variation. To address these drawbacks, a fuzzy-based distributed secondary controller is proposed. The proposed controller in each DS simultaneously ensures balanced current sharing and sustains DC bus voltage at the reference value by using a communication network to interact with one another. The required circumstance to guarantee the proposed controller’s stability is provided. The stability analysis is beneficial to inform the choice of control parameters. The real-time simulation outputs demonstrate the proposed control scheme’s robustness in achieving the control objectives under varying operating conditions.

Keywords: current sharing; DC microgrid; distributed secondary control; fuzzy logic; voltage regulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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