Island DC Microgrid Hierarchical Coordinated Multi-Mode Control Strategy

As renewable energy sources connecting to power systems continue to improve and new-type loads, such as electric vehicles, grow rapidly, direct current (DC) microgrids are attracting great attention in distribution networks. In order to satisfy the voltage stability requirements of island DC microgr...

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Main Authors: Zhongbin Zhao, Jing Zhang, Yu He, Ying Zhang
Format: Article
Language:English
Published: MDPI AG 2019-08-01
Series:Energies
Subjects:
Online Access:https://www.mdpi.com/1996-1073/12/15/3012
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author Zhongbin Zhao
Jing Zhang
Yu He
Ying Zhang
author_facet Zhongbin Zhao
Jing Zhang
Yu He
Ying Zhang
author_sort Zhongbin Zhao
collection DOAJ
description As renewable energy sources connecting to power systems continue to improve and new-type loads, such as electric vehicles, grow rapidly, direct current (DC) microgrids are attracting great attention in distribution networks. In order to satisfy the voltage stability requirements of island DC microgrids, the problem of inaccurate load power dispatch caused by line resistance must be solved and the defects of centralized communication and control must be overcome. A hierarchical, coordinated, multiple-mode control strategy based on the switch of different operation modes is proposed in this paper and a three-layer control structure is designed for the control strategy. Based on conventional droop control, a current-sharing layer and a multi-mode switching layer are used to ensure the stable operation of the DC microgrid. Accurate load power dispatch is satisfied using a difference discrete consensus algorithm. Furthermore, virtual bus voltage information is applied to guarantee smooth switching between various modes, which safeguards voltage stability. Simulation verification is carried out for the proposed control strategy by power systems computer aided design/electromagnetic transients including DC (PSCAD/EMTDC). The results indicate that the proposed control strategy guarantees the voltage stability of island DC microgrids and accurate load power dispatch under different operation modes.
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spelling doaj.art-479c5256591d4214adb4109dc4a6c34e2022-12-22T04:03:48ZengMDPI AGEnergies1996-10732019-08-011215301210.3390/en12153012en12153012Island DC Microgrid Hierarchical Coordinated Multi-Mode Control StrategyZhongbin Zhao0Jing Zhang1Yu He2Ying Zhang3School of Electrical Engineering, Guizhou University, Guiyang 550025, ChinaSchool of Electrical Engineering, Guizhou University, Guiyang 550025, ChinaSchool of Electrical Engineering, Guizhou University, Guiyang 550025, ChinaGuizhou Power Grid Company, Guiyang 550001, ChinaAs renewable energy sources connecting to power systems continue to improve and new-type loads, such as electric vehicles, grow rapidly, direct current (DC) microgrids are attracting great attention in distribution networks. In order to satisfy the voltage stability requirements of island DC microgrids, the problem of inaccurate load power dispatch caused by line resistance must be solved and the defects of centralized communication and control must be overcome. A hierarchical, coordinated, multiple-mode control strategy based on the switch of different operation modes is proposed in this paper and a three-layer control structure is designed for the control strategy. Based on conventional droop control, a current-sharing layer and a multi-mode switching layer are used to ensure the stable operation of the DC microgrid. Accurate load power dispatch is satisfied using a difference discrete consensus algorithm. Furthermore, virtual bus voltage information is applied to guarantee smooth switching between various modes, which safeguards voltage stability. Simulation verification is carried out for the proposed control strategy by power systems computer aided design/electromagnetic transients including DC (PSCAD/EMTDC). The results indicate that the proposed control strategy guarantees the voltage stability of island DC microgrids and accurate load power dispatch under different operation modes.https://www.mdpi.com/1996-1073/12/15/3012direct current (DC) microgridmulti-mode smooth switchdroop controldifference discrete consensus algorithmhierarchical coordinated control
spellingShingle Zhongbin Zhao
Jing Zhang
Yu He
Ying Zhang
Island DC Microgrid Hierarchical Coordinated Multi-Mode Control Strategy
Energies
direct current (DC) microgrid
multi-mode smooth switch
droop control
difference discrete consensus algorithm
hierarchical coordinated control
title Island DC Microgrid Hierarchical Coordinated Multi-Mode Control Strategy
title_full Island DC Microgrid Hierarchical Coordinated Multi-Mode Control Strategy
title_fullStr Island DC Microgrid Hierarchical Coordinated Multi-Mode Control Strategy
title_full_unstemmed Island DC Microgrid Hierarchical Coordinated Multi-Mode Control Strategy
title_short Island DC Microgrid Hierarchical Coordinated Multi-Mode Control Strategy
title_sort island dc microgrid hierarchical coordinated multi mode control strategy
topic direct current (DC) microgrid
multi-mode smooth switch
droop control
difference discrete consensus algorithm
hierarchical coordinated control
url https://www.mdpi.com/1996-1073/12/15/3012
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AT yuhe islanddcmicrogridhierarchicalcoordinatedmultimodecontrolstrategy
AT yingzhang islanddcmicrogridhierarchicalcoordinatedmultimodecontrolstrategy