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Clean Energy Microgrids
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Clean Energy Microgrids

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A1: Smart Grids and Microgrids".

Deadline for manuscript submissions: closed (20 May 2020) | Viewed by 9816

Special Issue Editor

Prof. Dr. Shin'ya Obara

E-Mail Website
Guest Editor
Applied Energy Course, Factory of Engineering, School of Earth, Energy and Environment Engineering, Kitami Institute of Technology, Kitami 090-8507, Japan
Interests: microgrid; distributed energy system; compound energy system; operation planning; renewable energy; electric power system
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The main reason for sharing this Special Issue is the need for an updated material which not only describes the latest technology in microgrids, but that also puts into perspective the technology with important aspects related to economics, environment and policies, including special microgrids and future trends in the area. The aim of this Special Issue is to provide an overview of the latest technology and future trends of microgrids around the world, including their interrelation with broader clean energy systems. This Special Issue will cover the latest technology of microgrids around the world, and the main challenges and future trends, putting into perspective the technology with the key aspects of economics and the environment related to the projects.

Shin’ya Obara is a professor of the Department of Electrical and Electronic Engineering at the Kitami Institute of the University, Hokkaido, Japan. He received a B.S. in mechanical engineering from Nagaoka University of Technology, Japan in 1987, an M.S. in mechanical systems from Nagaoka University of Technology, in 1989 and a Ph.D. in mechanical science from Hokkaido University in 2000, while he working in companies and academic organizations. He worked as a researcher in the Department of Mechanical Science of Hokkaido University from 2000–2001. Dr. Shin’ya Obara joined Tomakomai National College of Technology in 2001 after an eight-year period in industry (as engineer and assistant manager for research in two different companies, namely Takasago Thermal Engineering Co., Ltd. and Aisin AW Co., Ltd. in Japan). He was associate professor of the Department of Mechanical Engineering of Tomakomai National College between 2001–2007. Moreover, he has been professor of the Department of Mechanical Engineering of Tomakomai National College in 2008 and professor of the Department of Electrical and Electronic Engineering at the Kitami Institute of Technology from 2008 to date. His research involves power and heat energy and operation optimization analyses of energy compound systems and energy efficiency, microgrid technology, and energy network systems with renewable energy sources. Dr. Obara is author and co-author of over 130 papers in national and international journals. His research field is the optimal planning of compound energy systems and smart grids.

Prof. Shin'ya Obara
Guest Editor

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Microgrid design
  • microgrid operation
  • economic efficiency of microgrids
  • microgrid planning
  • power stable technology of microgrids

Published Papers (3 papers)

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Research

30 pages, 20274 KiB  
Article
Design and Implementation of an Energy-Management System for a Grid-Connected Residential DC Microgrid
by Alfredo Padilla-Medina, Francisco Perez-Pinal, Alonso Jimenez-Garibay, Antonio Vazquez-Lopez and Juan Martinez-Nolasco
Energies 2020, 13(16), 4074; https://doi.org/10.3390/en13164074 - 06 Aug 2020
Cited by 5 | Viewed by 3224
Abstract
The design and implementation of an energy-management system (EMS) applied to a residential direct current microgrid (DC-µG) is presented in this work. The proposed residential DC-µG is designed to provide a maximum power of one kilowatt by using two photovoltaic arrays (PAs) of [...] Read more.
The design and implementation of an energy-management system (EMS) applied to a residential direct current microgrid (DC-µG) is presented in this work. The proposed residential DC-µG is designed to provide a maximum power of one kilowatt by using two photovoltaic arrays (PAs) of 500 W, a battery bank (BB) of 120 V–115 Ah, a supercapacitor module of 0.230 F and a bidirectional DC–AC converter linked to the AC main grid (MG). The EMS works as a centralized manager and it defines the working operation mode for each section of the DC-µG. The operation modes are based on: (1) the DC-link bus voltage, (2) the generated or demanded power to each section of the DC-µG and (3) the BB’s state of charge. The proposed EMS—during the several working operation modes and at the same time—can obtain the maximum energy from the PAs, reduce the energy consumption from the main grid and keep the DC-link bus voltage inside a range of 190 V ± 5%. The EMS and local controllers are implemented by using LabVIEW and NI myRIO-1900 platforms. Moreover, experimental results during connection and disconnection of each DC-µG sections and different on-the-fly transitions are reported, these results focus on the behavior of the DC bus, which shows the DC bus robustness and stability. The robustness of the DC-µG is demonstrated by maintaining a balance of energy between the sources and loads connected to the DC bus under different scenarios. Full article
(This article belongs to the Special Issue Clean Energy Microgrids)
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26 pages, 6594 KiB  
Article
Consensus Control for Reactive Power Sharing Using an Adaptive Virtual Impedance Approach
by Ahmed S. Alsafran and Malcolm W. Daniels
Energies 2020, 13(8), 2026; https://doi.org/10.3390/en13082026 - 18 Apr 2020
Cited by 11 | Viewed by 2440
Abstract
Reactive power sharing among distributed generators (DGs) in islanded microgrids (MGs) presents control challenges, particularly in the mismatched feeder line condition. Improved droop control methods independently struggle to resolve this issue and centralized secondary control methods exhibit a high risk of collapse for [...] Read more.
Reactive power sharing among distributed generators (DGs) in islanded microgrids (MGs) presents control challenges, particularly in the mismatched feeder line condition. Improved droop control methods independently struggle to resolve this issue and centralized secondary control methods exhibit a high risk of collapse for the entire MG system under any failure in the central control. Distributed secondary control methods have been recently proposed to mitigate the reactive power error evident in the presence of mismatched feeder lines. This paper details a mathematical model of an adaptive virtual impedance control that is based on both leaderless and leader-followers consensus controls with a novel triangle mesh communication topology to ensure accurate active and reactive power sharing. The approach balances an enhanced rate of convergence with the anticipated implementation cost. A MATLAB/Simulink model with six DG units validates the proposed control performance under three different communication structures: namely, ring, complete, and triangle mesh topologies. The results suggest that leaderless consensus control is a reliable option with large DG systems, while the leader-followers consensus control is suitable for the small systems. The triangle mesh communication topology provides a compromise approach balancing the rate of convergence and the expected cost. The extensibility and scalability are advantages of this topology over the alternate ring and complete topologies. Full article
(This article belongs to the Special Issue Clean Energy Microgrids)
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20 pages, 5510 KiB  
Article
Island DC Microgrid Hierarchical Coordinated Multi-Mode Control Strategy
by Zhongbin Zhao, Jing Zhang, Yu He and Ying Zhang
Energies 2019, 12(15), 3012; https://doi.org/10.3390/en12153012 - 05 Aug 2019
Cited by 8 | Viewed by 3519
Abstract
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, [...] Read more.
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. Full article
(This article belongs to the Special Issue Clean Energy Microgrids)
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