Special Issue "Clean Energy Microgrids"

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

Deadline for manuscript submissions: closed (20 May 2020).

Special Issue Editor

Prof. Dr. Shin'ya Obara
Website
Guest Editor
Applied Energy Course, Factory of Engineering, School of Earth, Energy and Environment Engineering, Kitami Institute of Technology, Japan
Interests: microgrid; distributed energy system; compound energy system; operation planning; renewable energy; electric power system

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

Manuscript Submission Information

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Keywords

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

Published Papers (2 papers)

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Research

Open AccessArticle
Consensus Control for Reactive Power Sharing Using an Adaptive Virtual Impedance Approach
Energies 2020, 13(8), 2026; https://doi.org/10.3390/en13082026 - 18 Apr 2020
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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Open AccessArticle
Island DC Microgrid Hierarchical Coordinated Multi-Mode Control Strategy
Energies 2019, 12(15), 3012; https://doi.org/10.3390/en12153012 - 05 Aug 2019
Cited by 1
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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