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Special Issue "Microgrids-2018"

A special issue of Energies (ISSN 1996-1073).

Deadline for manuscript submissions: 31 August 2018

Special Issue Editor

Guest Editor
Prof. Dr. Josep M. Guerrero
Highly Cited - Clarivate Analytics (formerly Thomson Reuters)

Microgrid Research Programme, Department of Energy Technology, Aalborg University Pontoppidanstraede 111, room 25, 9220 Aalborg, Denmark
Website | E-Mail
Interests: microgrids; minigrids; islanded energy systems; distributed generation; renewable energy; hierarchical control; distributed control; maritime microgrids, onboard grids

Special Issue Information

Dear Colleagues,

Microgrids are small-scale energy grids that can operate independently or autonomously from the main energy grid. They can contain generation, storage and consumption of any form of energy, including electricity, heat, etc. The concept is supposed to eliminate or reduce the use of energy transmission systems, to produce energy near consumption points, thus, constituting small distribution systems. This new energy paradigm is changing the way we conceive of electrical, thermal, gas, or water grids. This Special Issue includes, but is not limited, to the following topics:

  • AC, DC, and AC-DC hybrid microgrids
  • Power electronics-based microgrids
  • Small-scale renewable energies and storage for microgrids
  • Micro combined heat and power (CHP) systems for microgrids
  • Multiple microgrid clusters
  • Microgrids and nanogrids for rural areas and in developing countries
  • Microgrids for all/hybrid electrical ships and green ports
  • Microgrids for electrical vehicle charging stations
  • Advanced control techniques for microgrids
  • Smart metering and power quality for microgrids
  • The Internet of things and energy Internet for multiple microgrids
  • Reviews on the state-of-the-art in the area of microgrids

Prof. Dr. Josep M. Guerrero
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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 monthly 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 1600 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

  • microgrids
  • renewable energy

Published Papers (4 papers)

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Research

Open AccessArticle Novel Distributed Optimal Control of Battery Energy Storage System in an Islanded Microgrid with Fast Frequency Recovery
Energies 2018, 11(8), 1955; https://doi.org/10.3390/en11081955
Received: 18 July 2018 / Revised: 18 July 2018 / Accepted: 27 July 2018 / Published: 27 July 2018
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Abstract
Highly intermittent renewable energy sources pose new challenges to microgrid operation and control. Thus, many distributed control strategies have been proposed to solve this problem. However, for most previous studies, the system frequency fluctuation can be further controlled on the basis of the
[...] Read more.
Highly intermittent renewable energy sources pose new challenges to microgrid operation and control. Thus, many distributed control strategies have been proposed to solve this problem. However, for most previous studies, the system frequency fluctuation can be further controlled on the basis of the optimal control strategy. This paper proposes a novel distributed optimal control strategy of a battery energy storage system in an islanded microgrid to provide desired optimal control performance and fast frequency recovery. The proposed control strategy is implemented through a multi-agent system based on consensus algorithm, which only requires information collected through a local communication network. Furthermore, the measurement of supply–demand mismatch is replaced by the control signal obtained from a supplementary controller with the improved linear active disturbance rejection control algorithm. The stability of microgrid frequency can be greatly enhanced through this improvement. Finally, the validity of proposed method is demonstrated by various case studies which are given in this paper. Full article
(This article belongs to the Special Issue Microgrids-2018)
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Open AccessArticle A Multi-Agent System-Based Approach for Optimal Operation of Building Microgrids with Rooftop Greenhouse
Energies 2018, 11(7), 1876; https://doi.org/10.3390/en11071876
Received: 5 June 2018 / Revised: 4 July 2018 / Accepted: 17 July 2018 / Published: 18 July 2018
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Abstract
In this paper, an optimal energy management scheme for building microgrids with rooftop greenhouse is proposed. A building energy management system (BEMS) is utilized for the optimal fulfilment of energy demands in the building and the greenhouse. The exhaust heat generated due to
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In this paper, an optimal energy management scheme for building microgrids with rooftop greenhouse is proposed. A building energy management system (BEMS) is utilized for the optimal fulfilment of energy demands in the building and the greenhouse. The exhaust heat generated due to the operation of air conditioners in the building is used for fulfilling the cooling demands of the greenhouse via chillers. In addition to thermal and cooling demands, the four major control parameters (temperature, humidity, light intensity, and CO2 concentration) are also considered for optimal growth of crops in the greenhouse. A multi-agent system (MAS) is adopted to realize the interaction among several households of the building, the greenhouse, and the BEMS. The MAS comprises of several inner-level, intermediate level, and upper-level agents, which are responsible for their respective tasks. The performance of the proposed optimization strategy is evaluated for two seasons of a year, i.e., summer and winter. Numerical simulations have demonstrated the effectiveness of the proposed operation scheme for optimal operation of building microgrids with rooftop greenhouses. Full article
(This article belongs to the Special Issue Microgrids-2018)
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Open AccessArticle Impact of Demand Response Programs on Optimal Operation of Multi-Microgrid System
Energies 2018, 11(6), 1452; https://doi.org/10.3390/en11061452
Received: 10 May 2018 / Revised: 30 May 2018 / Accepted: 4 June 2018 / Published: 4 June 2018
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Abstract
The increased penetration of renewables is beneficial for power systems but it poses several challenges, i.e., uncertainty in power supply, power quality issues, and other technical problems. Backup generators or storage system have been proposed to solve this problem but there are limitations
[...] Read more.
The increased penetration of renewables is beneficial for power systems but it poses several challenges, i.e., uncertainty in power supply, power quality issues, and other technical problems. Backup generators or storage system have been proposed to solve this problem but there are limitations remaining due to high installation and maintenance cost. Furthermore, peak load is also an issue in the power distribution system. Due to the adjustable characteristics of loads, strategies on demand side such as demand response (DR) are more appropriate in order to deal with these challenges. Therefore, this paper studies how DR programs influence the operation of the multi-microgrid (MMG). The implementation is executed based on a hierarchical energy management system (HiEMS) including microgrid EMSs (MG-EMSs) responsible for local optimization in each MG and community EMS (C-EMS) responsible for community optimization in the MMG. Mixed integer linear programming (MILP)-based mathematical models are built for MMG optimal operation. Five scenarios consisting of single DR programs and DR groups are tested in an MMG test system to evaluate their impact on MMG operation. Among the five scenarios, some DR programs apply curtailing strategies, resulting in a study about the influence of base load value and curtailable load percentage on the amount of curtailed load and shifted load as well as the operation cost of the MMG. Furthermore, the impact of DR programs on the amount of external and internal trading power in the MMG is also examined. In summary, each individual DR program or group could be handy in certain situations depending on the interest of the MMG such as external trading, self-sufficiency or operation cost minimization. Full article
(This article belongs to the Special Issue Microgrids-2018)
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Open AccessArticle A Communication-Free Decentralized Control for Grid-Connected Cascaded PV Inverters
Energies 2018, 11(6), 1375; https://doi.org/10.3390/en11061375
Received: 25 April 2018 / Revised: 18 May 2018 / Accepted: 25 May 2018 / Published: 29 May 2018
Cited by 2 | PDF Full-text (5214 KB) | HTML Full-text | XML Full-text
Abstract
This paper proposes a communication-free decentralized control for grid-connected cascaded PV inverter systems. The cascaded PV inverter system is an AC-stacked architecture, which promotes the integration of low voltage (LV) distributed photovoltaic (PV) generators into the medium/high voltage (MV/HV) power grid. The proposed
[...] Read more.
This paper proposes a communication-free decentralized control for grid-connected cascaded PV inverter systems. The cascaded PV inverter system is an AC-stacked architecture, which promotes the integration of low voltage (LV) distributed photovoltaic (PV) generators into the medium/high voltage (MV/HV) power grid. The proposed decentralized control is fully free of communication links and phase-locked loop (PLL). All cascaded inverters are controlled as current controlled voltage sources locally and independently to achieve maximum power point tracking (MPPT) and frequency self-synchronization with the power grid. As a result, control complexity as well as communication costs are reduced, and the system’s reliability is greatly enhanced compared with existing communication-based methods. System stability and dynamic performance are evaluated by small-signal analysis to guide the design of system parameters. The feasibility and effectiveness of the proposed solution are verified by simulation tests. Full article
(This article belongs to the Special Issue Microgrids-2018)
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