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Energies
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Energy Conversion and Operation Technologies for Smart Grid
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Energy Conversion and Operation Technologies for Smart Grid

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 (30 September 2022) | Viewed by 9796

Special Issue Editors

Prof. Dr. Joon-Ho Choi

E-Mail Website
Guest Editor
Department of Electrical Engineering, Chonnam National University, Gwangju 500-757, Korea
Interests: power system; smart grid; microgrid; renewable energy resources; power electronic applications for power grid
Special Issues, Collections and Topics in MDPI journals
Dr. Truong-Duy Duong

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, Wayne State University, Detroit, MI 48202, USA
Interests: power electronics; DC-DC converters; impedance source inverters
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Smart grid technology enables the energy industry to transform into new reliability, availability, and efficiency. During the transition period, it will be critical to carry out testing, technology improvements, development of new standards and regulations, and information sharing between projects to ensure that the benefits we envision from the smart grid become a reality. The digitalization, decentralization, electrification, and renewable energy technologies of the smart grid have become challenging issues.

The Special Issue invites original research papers to address new applications of energy conversion technologies and operation algorithms for smart grid which enable it to be used for realistic and practical existing power industry applications. Additionally, the authors are encouraged to submit papers addressing the state-of-the-art and recent advancements in the areas, providing useful guidelines for future research directions.

The topics of interest include but are not limited to the following:

  • Energy conversion technologies for renewable energy resources;
  • Energy conversion technologies for AC/DC smart grids;
  • Energy conversion technologies for AC/DC microgrids;
  • New energy management system for smart grids;
  • Operation and control algorithms for smart grids;
  • Artificial intelligent applications for smart grids;
  • Big data applications in smart grids;
  • Design and control of active distribution networks;
  • Standard and regulation for smart grids;
  • Information and data communications for smart grids.

Prof. Dr. Joon-Ho Choi
Dr. Truong-Duy Duong
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

  • Smart grid
  • Microgrid
  • Electrical power system
  • Active distribution network
  • System modelling and analysis
  • Operation and control method
  • Power electronics
  • Artificial intelligence
  • Big data analysis
  • Standard and regulations
  • Information and data communications.

Published Papers (4 papers)

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Research

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19 pages, 3580 KiB  
Article
Transformer-Less Switched-Capacitor Quasi-Switched Boost DC-DC Converter
by Truong-Duy Duong, Minh-Khai Nguyen, Tan-Tai Tran, Young-Cheol Lim and Joon-Ho Choi
Energies 2021, 14(20), 6591; https://doi.org/10.3390/en14206591 - 13 Oct 2021
Cited by 6 | Viewed by 1500
Abstract
In this article, a quasi-switched boost converter based on the switched-capacitor technique with high step-up voltage capability is dealt with and analyzed. The proposed converter offers a simple structure and low voltage stress on the semiconductor elements with intrinsic small duty cycle. An [...] Read more.
In this article, a quasi-switched boost converter based on the switched-capacitor technique with high step-up voltage capability is dealt with and analyzed. The proposed converter offers a simple structure and low voltage stress on the semiconductor elements with intrinsic small duty cycle. An inductor of the proposed converter is connected in series with the input voltage source; therefore, continuous input current ripple is attainable. In addition, the efficiency of the proposed converter is also improved. A detailed steady-state analysis is discussed to identify the salient features of the switched-capacitor-based quasi-switched boost DC-DC converter. The performance of the converter is compared against similar existing high boost DC-DC converters. Finally, the switched-capacitor-based quasi-switched boost DC-DC converter is investigated by experimental verification. Full article
(This article belongs to the Special Issue Energy Conversion and Operation Technologies for Smart Grid)
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17 pages, 7467 KiB  
Article
A Harmonic Compensation Method Using a Lock-In Amplifier under Non-Sinusoidal Grid Conditions for Single Phase Grid Connected Inverters
by Reyyan Ahmad Khan, Muhammad Noman Ashraf and Woojin Choi
Energies 2021, 14(3), 597; https://doi.org/10.3390/en14030597 - 25 Jan 2021
Cited by 7 | Viewed by 2532
Abstract
The power quality of grid-connected inverters (GCIs) is attracting a lot of attention as the number of distributed generation systems with renewable energy sources are increased. It is well known that the harmonics present in the grid have a lot of detrimental effects [...] Read more.
The power quality of grid-connected inverters (GCIs) is attracting a lot of attention as the number of distributed generation systems with renewable energy sources are increased. It is well known that the harmonics present in the grid have a lot of detrimental effects on the equipment and devices connected to a power system network such as heating and derating. These effects lead to problems in terms of safety and lifespan. Therefore, harmonic standards such as IEEE 519 and P1547 suggest that GCIs should achieve total harmonic distortion (THD) of the output current that is less than 5%. However, it is not easy to achieve the current THD of GCIs that is less than 5% with only an output filter under distorted grid conditions. In this paper, a harmonic compensation method using a lock-in amplifier (LIA) is proposed. Due to the outstanding performance of the LIA, accurate information of the harmonics can be obtained. This information is used to eliminate the harmonics by the simple PI controller. To demonstrate the superiority of the proposed method, it is applied to a 5 kW single phase GCI connected to the real grid. The results obtained are compared with those of the conventional harmonic compensation methods. Full article
(This article belongs to the Special Issue Energy Conversion and Operation Technologies for Smart Grid)
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26 pages, 24173 KiB  
Article
Energy Management System of DC Microgrid in Grid-Connected and Stand-Alone Modes: Control, Operation and Experimental Validation
by Hoon Lee, Jin-Wook Kang, Bong-Yeon Choi, Kyung-Min Kang, Mi-Na Kim, Chang-Gyun An, Junsin Yi and Chung-Yuen Won
Energies 2021, 14(3), 581; https://doi.org/10.3390/en14030581 - 23 Jan 2021
Cited by 11 | Viewed by 2550
Abstract
This paper proposes an energy management system (EMS) of direct current (DC) microgrid. In order to implement the proposed EMS, the control and operation method of EMS is presented in this work. While most of the studies have individually examined the grid-connected mode [...] Read more.
This paper proposes an energy management system (EMS) of direct current (DC) microgrid. In order to implement the proposed EMS, the control and operation method of EMS is presented in this work. While most of the studies have individually examined the grid-connected mode used in building and the stand-alone operation mode applicable to the island, the proposed EMS allows it to be used in both grid-connected mode and stand-alone mode with 10 modes. In order to determine each mode in EMS, not only the amount of generated power, load power, and the state of charge (SOC) of the battery, but also the rated power of the energy storage system (ESS) converter that performs charging and discharging operations is additionally considered. Thus, various uncertainties that may occur in the actual DC microgrid environment can be improved. A laboratory-scale DC microgrid is fabricated to conduct experimental validation of proposed EMS. Experiments of DC microgrid with proposed EMS were performed for each mode, and the experiment waveforms of each power conversion device are included in detail. Full article
(This article belongs to the Special Issue Energy Conversion and Operation Technologies for Smart Grid)
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Review

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18 pages, 4185 KiB  
Review
Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction
by Truong-Duy Duong, Minh-Khai Nguyen, Tan-Tai Tran, Dai-Van Vo, Young-Cheol Lim and Joon-Ho Choi
Energies 2022, 15(9), 3106; https://doi.org/10.3390/en15093106 - 24 Apr 2022
Cited by 15 | Viewed by 2174
Abstract
In grid-connected photovoltaic (PV) systems, a transformer is needed to achieve the galvanic isolation and voltage ratio transformations. Nevertheless, these traditional configurations of transformers increase the weight, size, and cost of the inverter while decreasing the efficiency and power density. The transformerless topologies [...] Read more.
In grid-connected photovoltaic (PV) systems, a transformer is needed to achieve the galvanic isolation and voltage ratio transformations. Nevertheless, these traditional configurations of transformers increase the weight, size, and cost of the inverter while decreasing the efficiency and power density. The transformerless topologies have become a good solution. However, the problem is that commode-mode voltage and leakage current can occur via the stray capacitors between the PV array and the ground of the inverter. Various transformerless inverters have been introduced with different techniques, such as reducing the common-mode voltage or eliminating the leakage current. Furthermore, to introduce the development of transformerless PV inverters, especially in three-phase two-level inverter systems, this paper provides a comprehensive review of various common-mode voltage reduction three-phase two-level inverters. Full article
(This article belongs to the Special Issue Energy Conversion and Operation Technologies for Smart Grid)
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