DC Grids: Recent Advances and Future Trends

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy Science and Technology".

Deadline for manuscript submissions: closed (20 June 2023) | Viewed by 3683

Special Issue Editor

School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK
Interests: electric potential; engineering; DC–DC converters; high voltage direct current system; converters; static synchronous compensators

Special Issue Information

Dear Colleagues,

The development of DC power grids co-playing with existing AC systems can facilitate large-scale integration, wide area transmission, and smart usage of renewable energy with enhanced reliability and operating efficiency.

HVDC transmission is recognised as the enabling technology to economically link remote energy sources to the load centre by eliminating reactive power issues. Extensive HVDC networks are being developed globally in recent decades. In the power distribution level, MVDC and LVDC are advocated not only to upgrade the existing infrastructure but also to meet new emerging applications along with power system liberalisation processes. Some of these examples include PV generation, microgrid, transportation electrification, subsea electrification, offshore wind power collection, and special power supply for industrial, urban, and data centres.

This Special Issue aims to invite the latest developments and new perspectives for DC grid-related technologies from the wide community. Topics will cover but not be limited to:

  • HVDC system, modelling, control, and protection;
  • MVDC onshore and offshore applications, DC microgrid architecture, and operating strategy;
  • Integration of energy storage element;
  • Power electronics converters for HVDC and MVDC;
  • DC fault localisation algorithms and DC circuit breakers;
  • DC grid planning and optimisation;
  • Interaction and coordination between DC and AC systems;
  • DC grid standardisation and grid code proposals.

Dr. Peng Li
Guest Editor

Manuscript Submission Information

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Keywords

  • DC grid
  • HVDC
  • MVDC
  • LVDC
  • microgrid
  • power electronics
  • storage
  • DC fault detection
  • DC fault protection
  • system stability
  • control
  • optimisation

Published Papers (2 papers)

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Research

17 pages, 7732 KiB  
Article
A Three-Port Power Electronic Transformer Based on Magnetic Integration
by Zhixian Liao, Yingzong Jiao, Zhiwen Suo, Binbin Li, Xiaodong Zhao, Linjie Han and Dianguo Xu
Appl. Sci. 2022, 12(22), 11607; https://0-doi-org.brum.beds.ac.uk/10.3390/app122211607 - 15 Nov 2022
Viewed by 1120
Abstract
This paper proposes a three-port power electronic transformer (PET) based on magnetic integration, where the modular multilevel converter (MMC) arm inductors and high-frequency transformer are integrated; thus, the low-voltage DC (LVDC) port can be directly obtained. Such a magnetic integration structure has advantages [...] Read more.
This paper proposes a three-port power electronic transformer (PET) based on magnetic integration, where the modular multilevel converter (MMC) arm inductors and high-frequency transformer are integrated; thus, the low-voltage DC (LVDC) port can be directly obtained. Such a magnetic integration structure has advantages of reduction in magnetic volume and number of active switches, implying a compact structure and reduced cost. Compared with existing PETs, the proposed PET can save more than 60% of magnetic volume and more than 19% of device cost. The proposed PET is suitable for AC/DC hybrid distribution applications with medium-voltage DC (MVDC), medium-voltage AC (MVAC), and LVDC ports, especially for scenarios where moderate amounts of power (100 s of kW) are tapped from an LVDC port. The feasibility of the proposed three-port PET has been verified by simulation and experimental results. Full article
(This article belongs to the Special Issue DC Grids: Recent Advances and Future Trends)
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12 pages, 3428 KiB  
Article
Rio Madeira HVDC System: Commissioning of the Ground Electrode for Bipole 2 at Porto Velho
by Paulo Freire, Jairo Kalife and Gil Oliveira
Appl. Sci. 2022, 12(7), 3279; https://0-doi-org.brum.beds.ac.uk/10.3390/app12073279 - 23 Mar 2022
Cited by 3 | Viewed by 1668
Abstract
The original ground electrode of the Madeira River HVDC transmission system, bipole 2, was discarded due to the risk of saturation of the transformers in the Converter Substation of Porto Velho, located 15 km away, during the monopolar operation with ground return. After [...] Read more.
The original ground electrode of the Madeira River HVDC transmission system, bipole 2, was discarded due to the risk of saturation of the transformers in the Converter Substation of Porto Velho, located 15 km away, during the monopolar operation with ground return. After an extensive geophysical survey, a new site was selected, 40 km from the converter substation. For the confirmation of the new site, it was built in the central area of the site, a single-well 47 m deep test electrode, interconnected to the original 15 km electrode line by an additional 40 km long temporary line. A new electrode was then designed. This paper summarizes the test electrode procedure and the activities developed for the new electrode commissioning after its construction, which can be divided into two phases–pre-commissioning and commissioning. The electrode pre-commissioning was performed before its energization for the evaluation of the integrity of its components. The commissioning tests started with electrode energization, employing the electrode line, and an unbalanced bipole operation, which allowed the evaluation of its electrical performance. However, the main objective of the paper is the evaluation of the electrode resistance, which is an essential HVDC electrode parameter. Full article
(This article belongs to the Special Issue DC Grids: Recent Advances and Future Trends)
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