An enhanced consensus-based distributed secondary control for voltage regulation and proper current sharing in a DC islanded microgrid

A centralized secondary control is utilized in a DC islanded microgrid to fine-tune voltage levels following the implementation of droop control. This is done to avoid conflicts between current allocation and voltage adjustments. However, because it introduces a single point of failure, a distribute...

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Main Authors: Nada Mosaad, Omar Abdel-Rahim, Tamer F. Megahed, Wesam Rohouma, Tanemasa Asano, Sobhy M. Abdelkader
Format: Article
Language:English
Published: Frontiers Media S.A. 2023-11-01
Series:Frontiers in Energy Research
Subjects:
Online Access:https://www.frontiersin.org/articles/10.3389/fenrg.2023.1277198/full
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author Nada Mosaad
Omar Abdel-Rahim
Omar Abdel-Rahim
Tamer F. Megahed
Tamer F. Megahed
Wesam Rohouma
Tanemasa Asano
Sobhy M. Abdelkader
Sobhy M. Abdelkader
author_facet Nada Mosaad
Omar Abdel-Rahim
Omar Abdel-Rahim
Tamer F. Megahed
Tamer F. Megahed
Wesam Rohouma
Tanemasa Asano
Sobhy M. Abdelkader
Sobhy M. Abdelkader
author_sort Nada Mosaad
collection DOAJ
description A centralized secondary control is utilized in a DC islanded microgrid to fine-tune voltage levels following the implementation of droop control. This is done to avoid conflicts between current allocation and voltage adjustments. However, because it introduces a single point of failure, a distributed secondary control is preferred. This paper introduces a consensus-based secondary distributed control approach to restore critical bus voltages to their nominal values and properly distribute current among converters. The critical bus takes the lead in voltage adjustments, with only connected energy resources contributing to regulation. The microgrid is represented as an undirected graph to facilitate consensus building. Two adjustment terms, δv and δi, are generated to assist in returning voltage to its nominal level and correctly allocating current among energy resources. To enhance consistency and improve controller performance compared to those reported in existing literature, all buses are connected to a leader node. In the event of the failure of all converters except one, voltage can still be effectively restored. MATLAB-Simulink simulations are conducted on two medium-voltage DC (MVDC) microgrids to validate the efficiency of the proposed control method. The results confirmed that the proposed control method can effectively maintain voltage stability and enhance the precise distribution of current among agents by 8%.
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spelling doaj.art-362e27fa850445f3a25dcc8addabfd732023-11-29T05:43:51ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2023-11-011110.3389/fenrg.2023.12771981277198An enhanced consensus-based distributed secondary control for voltage regulation and proper current sharing in a DC islanded microgridNada Mosaad0Omar Abdel-Rahim1Omar Abdel-Rahim2Tamer F. Megahed3Tamer F. Megahed4Wesam Rohouma5Tanemasa Asano6Sobhy M. Abdelkader7Sobhy M. Abdelkader8Electrical Power Engineering, Egypt-Japan University of Science and Technology (E-JUST), New Borg El-Arab City, Alexandria, EgyptElectrical Power Engineering, Egypt-Japan University of Science and Technology (E-JUST), New Borg El-Arab City, Alexandria, EgyptElectrical Engineering Department, Faculty of Engineering, Aswan University, Aswan, EgyptElectrical Power Engineering, Egypt-Japan University of Science and Technology (E-JUST), New Borg El-Arab City, Alexandria, EgyptElectrical Engineering Department, Faculty of Engineering, Mansoura University, El-Mansoura, EgyptElectrical Power and Renewable Energy, University of Doha for Science and Technology, Doha, QatarFaculty of Information Science and Electrical Engineering, Kyushu University, Fukuoka, JapanElectrical Power Engineering, Egypt-Japan University of Science and Technology (E-JUST), New Borg El-Arab City, Alexandria, EgyptElectrical Engineering Department, Faculty of Engineering, Mansoura University, El-Mansoura, EgyptA centralized secondary control is utilized in a DC islanded microgrid to fine-tune voltage levels following the implementation of droop control. This is done to avoid conflicts between current allocation and voltage adjustments. However, because it introduces a single point of failure, a distributed secondary control is preferred. This paper introduces a consensus-based secondary distributed control approach to restore critical bus voltages to their nominal values and properly distribute current among converters. The critical bus takes the lead in voltage adjustments, with only connected energy resources contributing to regulation. The microgrid is represented as an undirected graph to facilitate consensus building. Two adjustment terms, δv and δi, are generated to assist in returning voltage to its nominal level and correctly allocating current among energy resources. To enhance consistency and improve controller performance compared to those reported in existing literature, all buses are connected to a leader node. In the event of the failure of all converters except one, voltage can still be effectively restored. MATLAB-Simulink simulations are conducted on two medium-voltage DC (MVDC) microgrids to validate the efficiency of the proposed control method. The results confirmed that the proposed control method can effectively maintain voltage stability and enhance the precise distribution of current among agents by 8%.https://www.frontiersin.org/articles/10.3389/fenrg.2023.1277198/fullDC microgriddistributed secondary controlconsensus algorithmvoltage stabilitycurrent sharing
spellingShingle Nada Mosaad
Omar Abdel-Rahim
Omar Abdel-Rahim
Tamer F. Megahed
Tamer F. Megahed
Wesam Rohouma
Tanemasa Asano
Sobhy M. Abdelkader
Sobhy M. Abdelkader
An enhanced consensus-based distributed secondary control for voltage regulation and proper current sharing in a DC islanded microgrid
Frontiers in Energy Research
DC microgrid
distributed secondary control
consensus algorithm
voltage stability
current sharing
title An enhanced consensus-based distributed secondary control for voltage regulation and proper current sharing in a DC islanded microgrid
title_full An enhanced consensus-based distributed secondary control for voltage regulation and proper current sharing in a DC islanded microgrid
title_fullStr An enhanced consensus-based distributed secondary control for voltage regulation and proper current sharing in a DC islanded microgrid
title_full_unstemmed An enhanced consensus-based distributed secondary control for voltage regulation and proper current sharing in a DC islanded microgrid
title_short An enhanced consensus-based distributed secondary control for voltage regulation and proper current sharing in a DC islanded microgrid
title_sort enhanced consensus based distributed secondary control for voltage regulation and proper current sharing in a dc islanded microgrid
topic DC microgrid
distributed secondary control
consensus algorithm
voltage stability
current sharing
url https://www.frontiersin.org/articles/10.3389/fenrg.2023.1277198/full
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