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Volume 12
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Proceeding Paper

Mitigation of Circulating Currents for Parallel Connected Sources in a Standalone DC Microgrid †

by
Muhammad Rashad
1,*,
Uzair Raoof
1,
Nazam Siddique
2 and
Daud Mustafa Minhas
3
1
Department of Electrical Engineering, The University of Lahore (UOL), Lahore 54000, Pakistan
2
Department of Electrical Engineering, University of Gujrat (UOG), Gujrat 50700, Pakistan
3
Department of Systems Engineering, Saarland University, D-66123 Saarbrucken, Germany
*
Author to whom correspondence should be addressed.
†
Presented at the 1st International Conference on Energy, Power and Environment, Gujrat, Pakistan, 11–12 November 2021.
Eng. Proc. 2021, 12(1), 31; https://doi.org/10.3390/engproc2021012031
Published: 24 December 2021
(This article belongs to the Proceedings of The 1st International Conference on Energy, Power and Environment)
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Abstract

In a standalone DC microgrid, sources are interconnected in a parallel configuration. When sources of different power ratings are parallel connected, there arises a major issue of circulating currents which disturb current sharing by sources as per their capacity. Consequently, the voltage regulation becomes poorer. Additionally, connecting line resistances also play their part to contribute to abnormal current sharing. Droop controllers are normally preferred for the mitigation of circulating currents among parallel-connected sources. However, droop controllers cannot eliminate circulating currents for different rating sources. Hence, current sharing and voltage regulation cannot be ensured simultaneously. To address the issues, a distributed architecture-based Sliding Mode Control (SMC) technique is proposed in this paper. An analysis of the circulating currents for a two-source system is presented. Simulation results are presented to show the effectiveness and fail-safe operation of the proposed technique in a steady-state condition.
Keywords: microgrid; circulating current; voltage regulation; droop controller; sliding mode control microgrid; circulating current; voltage regulation; droop controller; sliding mode control

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MDPI and ACS Style

Rashad, M.; Raoof, U.; Siddique, N.; Minhas, D.M. Mitigation of Circulating Currents for Parallel Connected Sources in a Standalone DC Microgrid. Eng. Proc. 2021, 12, 31. https://doi.org/10.3390/engproc2021012031

AMA Style

Rashad M, Raoof U, Siddique N, Minhas DM. Mitigation of Circulating Currents for Parallel Connected Sources in a Standalone DC Microgrid. Engineering Proceedings. 2021; 12(1):31. https://doi.org/10.3390/engproc2021012031

Chicago/Turabian Style

Rashad, Muhammad, Uzair Raoof, Nazam Siddique, and Daud Mustafa Minhas. 2021. "Mitigation of Circulating Currents for Parallel Connected Sources in a Standalone DC Microgrid" Engineering Proceedings 12, no. 1: 31. https://doi.org/10.3390/engproc2021012031

APA Style

Rashad, M., Raoof, U., Siddique, N., & Minhas, D. M. (2021). Mitigation of Circulating Currents for Parallel Connected Sources in a Standalone DC Microgrid. Engineering Proceedings, 12(1), 31. https://doi.org/10.3390/engproc2021012031

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