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Energies
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Solid State Transformers
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Solid State Transformers

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

Deadline for manuscript submissions: closed (31 December 2019) | Viewed by 7359

Special Issue Editors

Dr. Georgios Konstantinou

E-Mail Website
Guest Editor
School of Electrical Engineering and Telecommunications & Australian Energy Research Institute, The University of New South Wales, Sydney, NSW, Australia
Interests: multilevel power electronics converters; hybrid multilevel converters; modular multilevel converters (MMC); HVDC systems; pulse width modulation of power electronics; selective harmonic elimination (SHE-PWM)
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Zixin Li

E-Mail Website
Guest Editor
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, China, and University of Chinese Academy of Sciences, Beijing, China
Interests: high-power and multilevel power electronic converters in Smart Grid; the Internet of Energy; HVDC systems

Special Issue Information

Dear Colleagues,

Transformers have played a critical role in the development of the current power system for more than a century and today represent a mature technology and an established market with multiple vendors. Power electronics are becoming more prevalent in the modern power system and have begun to have a substantial impact. They enable a great range of possibilities such as microgrids of multiple scale, bidirectional and multi-directional power systems, and combined ac/dc power flows.

Solid-state transformers (SSTs), also referred to as Power Electronics Transformers (PETs), have emerged in the effort to address many of these applications. They include power electronics stages across different voltage levels typically connected through a medium or high frequency transformer. SSTs are gradually moving from the research to the development and application stage and expanding from niche to more mainstream applications in smart grids, with the aim of becoming flexible assets for DSOs and TSOs in the future.

Our goal in this Special Issue is to address timely and topical research findings as well as operational experience in SSTs/PETs. We welcome high-quality, original works on topics such as, but not limited to, the following:

  • Power electronics converter topologies for solid-state transformer applications.
  • The control and operation of solid-state transformers.
  • Medium and high frequency, and medium- and high-power transformers.
  • Applications of solid-state transformers.
  • New semiconductor devices in SST transformers.
  • The reliability of SSTs.
  • Real-time modelling and simulation of SSTs.
  • The development and testing of experimental prototypes.

All submitted manuscripts will be subject to a thorough peer-review and editorial process.

Dr. Georgios Konstantinou
Prof. Dr. Zixin 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

  • solid-state transformer 
  • power electronics transformer 
  • advanced power electronics 
  • high-frequency transformer 
  • AC/DC power flow 
  • distribution networks 
  • microgrids 
  • renewable energy integration 
  • power electronics reliability 
  • smart grid

Published Papers (2 papers)

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Research

16 pages, 2976 KiB  
Article
Reduced-Order DC Terminal Dynamic Model for Multi-Port AC-DC Power Electronic Transformer
by Zhe Wang, Yaohua Li, Zixin Li, Cong Zhao, Fanqiang Gao and Ping Wang
Energies 2019, 12(11), 2130; https://doi.org/10.3390/en12112130 - 03 Jun 2019
Cited by 5 | Viewed by 2089
Abstract
As new electric power conversion equipment, a multi-port power electronic transformer (MP-PET), including a power electronic converter, high-frequency transformer, and multiple ac or dc interconnection interfaces, has a broad application in the hybrid distribution network. However, high integration and a large number of [...] Read more.
As new electric power conversion equipment, a multi-port power electronic transformer (MP-PET), including a power electronic converter, high-frequency transformer, and multiple ac or dc interconnection interfaces, has a broad application in the hybrid distribution network. However, high integration and a large number of energy storage devices has led to very a high-order model of the system. To address this issue, a reduced-order small signal model of MP-PET is established in this paper. By taking the participation factors of the system mode to the state variables, the reduced-order model is derived based on the state variables, which are highly correlated with the dc voltage dominant mode. Compared with the full-order model, the proposed reduced-order model is accurate enough and simplified, and the validity of the simplified model is verified against simulations on a 10 kV/3 MVA MP-PET. The simulation results indicate that the proposed reduced-order model coincides well with the dynamic performance of the MP-PET. Full article
(This article belongs to the Special Issue Solid State Transformers)
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16 pages, 2390 KiB  
Article
A Coupled, Semi-Numerical Model for Thermal Analysis of Medium Frequency Transformer
by Haonan Tian, Zhongbao Wei, Sriram Vaisambhayana, Madasamy Thevar, Anshuman Tripathi and Philip Kjær
Energies 2019, 12(2), 328; https://doi.org/10.3390/en12020328 - 21 Jan 2019
Cited by 7 | Viewed by 4622
Abstract
Medium-frequency (MF) transformer has gained much popularity in power conversion systems. Temperature control is a paramount concern, as the unexpected high temperature declines the safety and life expectancy of transformer. The scrutiny of losses and thermal-fluid behavior are thereby critical for the design [...] Read more.
Medium-frequency (MF) transformer has gained much popularity in power conversion systems. Temperature control is a paramount concern, as the unexpected high temperature declines the safety and life expectancy of transformer. The scrutiny of losses and thermal-fluid behavior are thereby critical for the design of MF transformers. This paper proposes a coupled, semi-numerical model for electromagnetic and thermal-fluid analysis of MF oil natural air natural (ONAN) transformer. An analytical model that is based on spatial distribution of flux density and AC factor is exploited to calculate the system losses, while the thermal-hydraulic behavior is modelled numerically leveraging the computational fluid dynamics (CFD) method. A close-loop iterative framework is formulated by coupling the analytical model-based electromagnetic analysis and CFD-based thermal-fluid analysis to address the temperature dependence. Experiments are performed on two transformer prototypes with different conductor types and physical geometries for validation purpose. Results suggest that the proposed model can accurately model the AC effects, losses, and the temperature rises at different system components. The proposed model is computationally more efficient than the full numerical method but it reserves accurate thermal-hydraulic characterization, thus it is promising for engineering utilization. Full article
(This article belongs to the Special Issue Solid State Transformers)
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