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High-Power Electronics in Distribution Grids
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High-Power Electronics in Distribution Grids

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

Deadline for manuscript submissions: 19 June 2024 | Viewed by 1999

Special Issue Editors

Dr. Shiqi Ji

E-Mail Website
Guest Editor
Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Interests: high-power electronic conversion system; application of power semiconductor; high-performance power converter for grids
Dr. Zhiyong Yuan

E-Mail Website
Guest Editor
Department of DC and Power Electronics, Electric Power Research Institute of CSG, Guangzhou 510663, China
Interests: renewable energy integration in distribution system; middle-voltage DC distribution system; microgrid
Dr. Li Zhang

E-Mail Website
Guest Editor
School of Electrical and Electronics Engineering, Huazhong University of Science and Technology, Wuhan, China
Interests: renewable energy power conversion; SiC/GaN power conversion; high frequency DC-DC converter
Dr. Kai Li

E-Mail Website
Guest Editor
School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Interests: power electronics transformers, traction power supply system; renewable energy grid-tied converters

Special Issue Information

Dear Colleagues,

The Guest Editor is inviting submissions to a Special Issue of Energies entitled “High-Power Electronics in Distribution Grids”.  With increasing renewable energies and DC sources/loads in distribution grids, an increasing number of power electronics have been widely applied, especially for high-power electronics with power ratings of more than hundreds of kilowatts. Many new techniques have emerged to address challenges both at the converter level and grid level.

This Special  Issue will include recent development regarding the components, topology and control of high-power electronics in distribution grids. Topics of interest for publication include, but are not limited to:

  • Power semiconductors and components for high-power electronic systems;
  • Topologies of high-power converters;
  • Power electronic transformers;
  • Multi-port power conversion systems;
  • High-efficiency high-power-density power conversion technology;
  • Converter controls and energy management systems for grids;
  • Architecture, operation and protection of grids;
  • Simulation and testing methods;
  • Future vision for next-generation grids and high-power electronic systems;
  • Other advanced technology in this area.

Dr. Shiqi Ji
Dr. Zhiyong Yuan
Dr. Li Zhang
Dr. Kai Li
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

  • power electronics
  • distribution grids
  • power semiconductor
  • power electronic transformer
  • converter topology
  • converter control
  • energy management
  • grid topology

Published Papers (3 papers)

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Research

14 pages, 5247 KiB  
Article
An Improved AC-Link Voltage Matching Control for the Multiport Modular Multilevel DC Transformer in MVDC Applications
by Yong Chen, Songtao Yu, Yizhen Wang, Ruixiong Yang and Xu Cheng
Energies 2024, 17(6), 1346; https://doi.org/10.3390/en17061346 - 12 Mar 2024
Viewed by 637
Abstract
In this paper, an improved AC-link voltage matching control (IVM) strategy is proposed for the multiport modular multilevel DC transformer (M3DCT), which comprises a single-phase modular multilevel converter (MMC) and a series of cascaded H-bridge units. The objective of the proposed IVM strategy [...] Read more.
In this paper, an improved AC-link voltage matching control (IVM) strategy is proposed for the multiport modular multilevel DC transformer (M3DCT), which comprises a single-phase modular multilevel converter (MMC) and a series of cascaded H-bridge units. The objective of the proposed IVM strategy is to address the AC-link voltage mismatch phenomenon. Distinct from existing control methods, such as various phase-shifting control methods and the conventional AC-link voltage matching control strategy, the proposed IVM strategy orchestrates the operation of the M3DCT in an innovative fashion. It allows the sum of inserted submodule (SM) numbers in the upper and lower arms to be flexible, no longer confined to a specific SM number per arm. Consequently, the AC-link voltage of the M3DCT is maintained proximate to the matched operating condition, regardless of the degree of mismatch in the DC side voltage of the M3DCT. This enables the enhancement of the M3DCT’s overall operational performance, particularly under conditions of light loads within medium-voltage DC (MVDC) distribution systems. The correctness and effectiveness of the proposed control strategy and the corresponding analysis are substantiated through simulation results. Full article
(This article belongs to the Special Issue High-Power Electronics in Distribution Grids)
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20 pages, 3873 KiB  
Article
Analysis and Design of Independent DC Bus Structure Multiport Power Electronic Transformer Based on Maximum Power Transmission Capability of Low-Voltage DC Ports
by Junchi Li, Junyong Wu and Fei Xiong
Energies 2024, 17(5), 1096; https://doi.org/10.3390/en17051096 - 25 Feb 2024
Viewed by 447
Abstract
Owing to the diverse connection configurations of dual active bridge converters, a multiplicity of low-voltage DC port structures are anticipated to emerge in the independent DC bus structure multiport power electronic transformer (IDBS-MPET). An inadequate low-voltage DC port structure exacerbates the power imbalance [...] Read more.
Owing to the diverse connection configurations of dual active bridge converters, a multiplicity of low-voltage DC port structures are anticipated to emerge in the independent DC bus structure multiport power electronic transformer (IDBS-MPET). An inadequate low-voltage DC port structure exacerbates the power imbalance in IDBS-MPET, presenting a risk of overmodulation even when transmitting relatively low levels of power. To overcome this limitation, a design scheme of IDBS-MPET topology based on the maximum power transmission capability of the low-voltage DC ports is proposed in this paper. Three topology design rules are derived from the maximum power transmission capability results of more than 80 typical IDBS-MPET topologies. The symmetrical triple cross-phase connection structure, the symmetrical double cross-phase connection structure and the single-phase connection structure are sequentially identified as the three most optimal structures of low-voltage DC ports. By employing the proposed design methodology, each low-voltage DC port achieves its maximum power transfer capability relative to other configurations. The effectiveness of the proposed design scheme is validated by an optimal designed IDBS-MPET topology with six low-voltage DC ports. Full article
(This article belongs to the Special Issue High-Power Electronics in Distribution Grids)
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16 pages, 2340 KiB  
Article
Piecewise Linear Power Flow Algorithm of DC Distribution Networks Considering Automatic Adjustment of VSC Control Strategy
by Ruixiong Yang, Yizhen Wang, Songtao Yu, Yong Chen and Xu Cheng
Energies 2024, 17(1), 41; https://doi.org/10.3390/en17010041 (registering DOI) - 21 Dec 2023
Viewed by 571
Abstract
Voltage source converter (VSC)-based DC distribution networks (DCDNs) can automatically adjust the control strategy of overloaded VSCs to adapt to the variation in renewable energy power, but it brings difficulties to the steady-state performance analysis of DCDNs. This paper presents a piecewise linear [...] Read more.
Voltage source converter (VSC)-based DC distribution networks (DCDNs) can automatically adjust the control strategy of overloaded VSCs to adapt to the variation in renewable energy power, but it brings difficulties to the steady-state performance analysis of DCDNs. This paper presents a piecewise linear power flow (PLPF) algorithm to estimate the joint effect of power disturbance and VSC control strategy adjustment on steady-state performance. Firstly, according to the VSC power balance, the critical point of the VSC hitting the capacity limit is directly determined, and the power variations in each node before VSC control strategy adjustment are obtained. Then, the linear power flow is revised considering the VSC control strategy adjustment. Inversion of the block Jacobian matrix is used to improve the calculation speed of linear power flow revision. Finally, linear power flow calculation is performed in each stage, and the steady-state performance is obtained by using the superposition method. Simulation results show that the proposed PLPF model can estimate the steady-state performance faster and more simply. Full article
(This article belongs to the Special Issue High-Power Electronics in Distribution Grids)
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