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Energies
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Applications of Medium Voltage Direct Current in Electric Systems
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Applications of Medium Voltage Direct Current in Electric Systems

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 10661

Special Issue Editors

Prof. Dr. Luis M. Fernández-Ramírez

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Guest Editor
Research Group in Sustainable and Renewable Electrical Technologies (PAIDI-TEP023), Department of Electrical Engineering, Higher Technical School of Engineering of Algeciras, University of Cadiz, Algeciras, Spain
Interests: smart cities; smart grids; microgrids; renewable energy; wind energy; photovoltaic solar energy; energy storage systems; hydrogen and fuel cells; hybrid electric systems; electric vehicles; electric power systems; power converters and energy management/control systems
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Dmitri Vinnikov

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Guest Editor
Department of Electrical Power Engineering and Mechatronics, School of Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
Interests: power electronics; renewable energy; photovoltaics; electrical engineering; impedance-source converters
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Carlos Andrés García Vázquez

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Guest Editor
Research Group in Electrical Technologies for Sustainable and Renewable Energy (PAIDI-TEP023), Department of Electrical Engineering, Higher Polytechnic School of Algeciras, University of Cadiz, Algeciras (Cádiz), Spain
Interests: renewable energy; wind energy; microgrids; electric vehicles; energy storage systems; power converters and energy management/control systems
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Electric power systems will need to accommodate large amounts of renewable energies and a growing number of DC loads with reduced costs and losses. The medium-voltage direct current (MVDC) grid concept can play a key role, since it can help reduce the number of conversion stages necessary for the integration of the low voltage output from a renewable generation source to the electricity grid, which operates at a much higher voltage. Furthermore, these same efficiencies are achieved in end-use applications for the increasing supply of DC loads in power grids. Therefore, MVDC architecture can serve as an additional stage of infrastructure in the electricity grid between transport and distribution levels, as well as a means to supply consumers of all kinds. Thus, MVDC is an enabling architecture in commercial, residential, industrial, generation or transportation sectors for the grid integration of renewable energies, energy storage systems, supply of DC loads, and future needs in the field of energy conversion systems among other possibilities.

This Special Issue is focused on the recent advances in the applications of MVDC in electrical systems, and includes, but is not limited, to the following topics:

  • MVDC for smart grids and microgrids.
  • MVDC for utility distribution networks.
  • MVDC in electric transportation.
  • MVDC in industrial application.
  • Renewable energies with MVDC.
  • Energy storage systems with MVDC.
  • Power electronics for MVDC.
  • Control techniques and energy management systems for MVDC grids.
  • Power quality in MVDC grids.
  • State-of-the-art reviews on MVDC applications.

Prof. Dr. Luis M. M. Fernández-Ramírez
Prof. Dr. Dmitri Vinnikov
Prof. Dr. Carlos Andrés García Vázquez
Guest Editors

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 submissions that pass pre-check are 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 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

  • MVDC smart grids/microgrids
  • MVDC distribution systems
  • MVDC power converters
  • renewable energies
  • energy storage systems
  • MVDC electric transport systems
  • control of MVDC systems
  • energy management of MVDC systems
  • power quality

Published Papers (3 papers)

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Research

21 pages, 508 KiB  
Article
A Two-Step State Estimation Algorithm for Hybrid AC-DC Distribution Grids
by Gaurav Kumar Roy, Marco Pau, Ferdinanda Ponci and Antonello Monti
Energies 2021, 14(7), 1967; https://0-doi-org.brum.beds.ac.uk/10.3390/en14071967 - 02 Apr 2021
Cited by 5 | Viewed by 1983
Abstract
Direct Current (DC) grids are considered an attractive option for integrating high shares of renewable energy sources in the electrical distribution grid. Hence, in the future, Alternating Current (AC) and DC systems could be interconnected to form hybrid AC-DC distribution grids. This paper [...] Read more.
Direct Current (DC) grids are considered an attractive option for integrating high shares of renewable energy sources in the electrical distribution grid. Hence, in the future, Alternating Current (AC) and DC systems could be interconnected to form hybrid AC-DC distribution grids. This paper presents a two-step state estimation formulation for the monitoring of hybrid AC-DC grids. In the first step, state estimation is executed independently for the AC and DC areas of the distribution system. The second step refines the estimation results by exchanging boundary quantities at the AC-DC converters. To this purpose, the modulation index and phase angle control of the AC-DC converters are integrated into the second step of the proposed state estimation formulation. This allows providing additional inputs to the state estimation algorithm, which eventually leads to improve the accuracy of the state estimation results. Simulations on a sample AC-DC distribution grid are performed to highlight the benefits resulting from the integration of these converter control parameters for the estimation of both the AC and DC grid quantities. Full article
(This article belongs to the Special Issue Applications of Medium Voltage Direct Current in Electric Systems)
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16 pages, 2708 KiB  
Article
Quasi-Z-Source Inverter-Based Photovoltaic Power System Modeling for Grid Stability Studies
by Lluís Monjo, Luis Sainz, Juan José Mesas and Joaquín Pedra
Energies 2021, 14(2), 508; https://0-doi-org.brum.beds.ac.uk/10.3390/en14020508 - 19 Jan 2021
Cited by 16 | Viewed by 3672
Abstract
Quasi-Z-source inverters (qZSIs) are becoming a powerful power conversion technology in photovoltaic (PV) power systems because they allow energy power conversion in a single stage operation. However, they can cause system resonances and reduce system damping, which may lead to instabilities. These stability [...] Read more.
Quasi-Z-source inverters (qZSIs) are becoming a powerful power conversion technology in photovoltaic (PV) power systems because they allow energy power conversion in a single stage operation. However, they can cause system resonances and reduce system damping, which may lead to instabilities. These stability problems are well known in grid-connected voltage source converter systems but not in quasi-Z-source inverter (qZSI)-based PV power systems. This paper contributes with Matlab/Simulink and PSCAD/EMTDC models of qZSI-based PV power systems to analyze transient interactions and stability problems. These models consider all power circuits and control blocks of qZSI-based PV power systems and can be used in sensitivity studies on the influence of system parameters on stability. PV power system stability is assessed from the proposed models. The causes of instabilities are analyzed from numerical simulations and possible solutions are proposed. Full article
(This article belongs to the Special Issue Applications of Medium Voltage Direct Current in Electric Systems)
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23 pages, 5770 KiB  
Article
Enhancing Line Capacity Utilization in Power Transmission System Using Active MVDC Link
by Changhee Han, Sungyoon Song, Juyong Kim and Gilsoo Jang
Energies 2019, 12(9), 1589; https://0-doi-org.brum.beds.ac.uk/10.3390/en12091589 - 26 Apr 2019
Cited by 5 | Viewed by 3641
Abstract
As a proportion of generation using renewable energy increases in a power system, the need for facility investment is increasing in not only the distribution system but also the transmission system. However, it is inefficient to invest in new equipment to deal with [...] Read more.
As a proportion of generation using renewable energy increases in a power system, the need for facility investment is increasing in not only the distribution system but also the transmission system. However, it is inefficient to invest in new equipment to deal with the short peak output of renewable energy generation. For this reason, this paper proposes a method for operating the grid more flexibly, through an optimal operating strategy of the direct current (DC) line at medium-voltage (MV) level, thereby delaying the facility investment in the transmission line. In order to determine the optimal operating point of the converter connected with a DC line, the swarm intelligence-based optimization technique, which can minimize multi-objective function, is used. In addition, in order to overcome the communication dependency of the centralized control, which needs to receive information about the optimal operating point computed by the system operator, this paper proposes a decentralized emergency control (DEC) method in case of a communication fault. Full article
(This article belongs to the Special Issue Applications of Medium Voltage Direct Current in Electric Systems)
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