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Electronics
Special Issues
Grid-Connected and Isolated Renewable Energy Systems
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Grid-Connected and Isolated Renewable Energy Systems

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Power Electronics".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 34213

Special Issue Editors

Dr. Xiaoqiang Guo

E-Mail Website
Guest Editor
Department of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
Interests: high-power converters and ac drives, electric vehicle charging station, and renewable energy power conversion systems
Dr. Minh-Khai Nguyen

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, Wayne State University, Detroit, MI 48202, USA
Interests: power electronics; impedance-source converters; multilevel inverters; PWM strategies; power converters for renewable energy systems and electric vehicles
Special Issues, Collections and Topics in MDPI journals
Dr. Mariusz Malinowski

E-Mail Website
Guest Editor
Institute of Control and Industrial Electronics, Warsaw University of Technology, ul. Koszykowa 75, 00-662 Warszawa, Poland
Interests: power electronics; single and multiphase multilevel converters; renewable energy sources; solid state transformer; distributed energy systems
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Elisabetta Tedeschi

E-Mail Website
Guest Editor
1. Department of Electric Power Engineering, Norwegian University of Science and Technology, 7030 Trondheim, Norway
2. Department of Industrial Engineering, University of Trento, 38122 Trento TN, Italy
Interests: ocean energy; control of wave energy converters; marine energy grid integration, microgrids and offshore isolated power systems; power quality; HVDC and HVAC power transmission; energy storage applications; subsea power distribution
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the rapid progress of renewable energies into grid, grid-connected systems are increasing dramatically around the world. For the efficient and reliable operation of grid-connected systems, many technical challenges should be dealt with, such as model, control, and industrial field applications. At the same time, renewable energy integration has gained momentum in traditionally isolated energy systems, where technical challenges can be even more significant. The objective of this Special Issue is to focus on the issues regarding grid-connected and isolated energy systems with significant renewable energy penetration, to provide an open opportunity for presentation and discussion of recently advanced technologies.

Authors are invited to submit full papers describing original research work in areas including, but not limited to:

  • Grid-connected converters and microgrids;
  • Offshore grid connected and isolated energy systems;
  • Control and stability issues of grid-connected and isolated energy systems;
  • Power quality of grid-connected and isolated energy systems;
  • Fault ride through control of grid-connected systems;
  • Grid codes and regulations for grid-connected and isolated energy systems;
  • Industrial applications of grid-connected and isolated energy systems;
  • Technical and economic evaluation of grid-connected and isolated energy systems.

Dr. Xiaoqiang Guo
Dr. Minh-Khai Nguyen
Dr. Mariusz Malinowski
Dr. Elisabetta Tedeschi
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. Electronics 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 2400 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.

Published Papers (6 papers)

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Editorial

Jump to: Research, Review

2 pages, 149 KiB  
Editorial
Grid-Connected and Isolated Renewable Energy Systems
by Xiaoqiang Guo, Minh-Khai Nguyen, Mariusz Malinowski and Elisabetta Tedeschi
Electronics 2021, 10(21), 2683; https://doi.org/10.3390/electronics10212683 - 03 Nov 2021
Cited by 1 | Viewed by 1077
Abstract
With the rapid progression of renewable energies into grids, grid-connected systems are increasing dramatically around the world [...] Full article
(This article belongs to the Special Issue Grid-Connected and Isolated Renewable Energy Systems)

Research

Jump to: Editorial, Review

12 pages, 2411 KiB  
Article
A New Converter for Non-Isolated PV Systems
by Huaibao Wang and Zhigang Lu
Electronics 2021, 10(14), 1716; https://doi.org/10.3390/electronics10141716 - 17 Jul 2021
Cited by 2 | Viewed by 1544
Abstract
A new converter for the non-isolated PV (photovoltaic) system is presented in this paper. It has the advantage that the input terminal of the proposed converter is connected to the output negative terminal. In this way, the parasitic capacitance is bypassed to eliminate [...] Read more.
A new converter for the non-isolated PV (photovoltaic) system is presented in this paper. It has the advantage that the input terminal of the proposed converter is connected to the output negative terminal. In this way, the parasitic capacitance is bypassed to eliminate the undesirable leakage current. The proposed converter can achieve the step-up voltage with four switches only. Aside from that, the carried-based modulation is used, and the control structure is simple. The article analyzes the working modes and control strategy of the proposed converter. In addition, a comparative analysis is provided. The feasibility of the proposed converter under different working modes is verified by simulation. Finally, the digital control prototype with DSP plus FPGA is established and the experimental tests are carried out. The experimental results verify the effectiveness of the proposed converter. Full article
(This article belongs to the Special Issue Grid-Connected and Isolated Renewable Energy Systems)
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22 pages, 10972 KiB  
Article
Seamless Switching Control Technology for the Grid-Connected Converter in Micro-Grids
by Changli Shi, Tongzhen Wei, Yushu Sun, Dongqiang Jia and Tianchu Li
Electronics 2020, 9(12), 2109; https://doi.org/10.3390/electronics9122109 - 10 Dec 2020
Cited by 2 | Viewed by 2327
Abstract
In order to ensure the reliable power supply of the local load in the micro-grid (MG), a seamless switching control technology (SSCT) suitable for grid-connected converter (GCC) is proposed. This technology includes silicon-controlled rectifiers (SCR) forced shutdown control strategy (SCR-FSCS) and three-loop control [...] Read more.
In order to ensure the reliable power supply of the local load in the micro-grid (MG), a seamless switching control technology (SSCT) suitable for grid-connected converter (GCC) is proposed. This technology includes silicon-controlled rectifiers (SCR) forced shutdown control strategy (SCR-FSCS) and three-loop control strategy (TLCS). The SCR-SSCT adjusts the load voltage in real time to form a back voltage at the grid-connected inductor, which greatly reduces the SCR shutdown time and ensures the reliability of local load power supply. The TLCS can easily realize the switching between the current source mode and the voltage source mode of the GCC. An experimental platform is established to carry out the relevant experiments. The experimental results show the rationality and effectiveness of the theoretical analysis and the proposed control technology. Full article
(This article belongs to the Special Issue Grid-Connected and Isolated Renewable Energy Systems)
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24 pages, 7267 KiB  
Article
Tan-Sun Transformation-Based Phase-Locked Loop in Detection of the Grid Synchronous Signals under Distorted Grid Conditions
by Guangjun Tan, Chunan Zong and Xiaofeng Sun
Electronics 2020, 9(4), 674; https://doi.org/10.3390/electronics9040674 - 20 Apr 2020
Cited by 4 | Viewed by 2473
Abstract
When three-phase voltages are polluted with unbalance, DC offsets, or higher harmonics, it is a challenge to quickly detect their parameters such as phases, frequency, and amplitudes. This paper proposes a phase-locked loop (PLL) for the three-phase non-ideal voltages based on the decoupling [...] Read more.
When three-phase voltages are polluted with unbalance, DC offsets, or higher harmonics, it is a challenge to quickly detect their parameters such as phases, frequency, and amplitudes. This paper proposes a phase-locked loop (PLL) for the three-phase non-ideal voltages based on the decoupling network composed of two submodules. One submodule is used to detect the parameters of the fundamental and direct-current voltages based on Tan-Sun transformation, and the other is used to detect the parameters of the higher-harmonic voltages based on Clarke transformation. By selecting the proper decoupling vector by mapping Hilbert space to Euclidean space, the decoupling control for each estimated parameter can be realized. The settling time of the control law can be set the same for each estimated parameter to further improve the response speed of the whole PLL system. The system order equals the number of the estimated parameters in each submodule except that a low-pass filter is required to estimate the average amplitude of the fundamental voltages, so the whole PLL structure is very simple. The simulation and experimental results are provided in the end to validate the effectiveness of the proposed PLL technique in terms of the steady and transient performance. Full article
(This article belongs to the Special Issue Grid-Connected and Isolated Renewable Energy Systems)
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19 pages, 5862 KiB  
Article
Bidirectional DC/DC and SOC Drooping Control for DC Microgrid Application
by Chunjiang Zhang, Pengcheng Li and Yingjun Guo
Electronics 2020, 9(2), 225; https://doi.org/10.3390/electronics9020225 - 30 Jan 2020
Cited by 10 | Viewed by 3652
Abstract
In DC microgrids, distributed energy storage plays a key role in stabilizing the DC bus voltage. The bidirectional DC/DC converter in the distributed energy storage system should be designed according to the voltage level and electromagnetic isolation requirements, and multiple energy storage units [...] Read more.
In DC microgrids, distributed energy storage plays a key role in stabilizing the DC bus voltage. The bidirectional DC/DC converter in the distributed energy storage system should be designed according to the voltage level and electromagnetic isolation requirements, and multiple energy storage units should be coordinated for load current distribution according to the state of charge (SOC). This paper proposes a SOC power index droop control strategy by communication lines to coordinate the fast and high-precision distribution of load current among multiple energy storage units, and the SOC between energy storage units quickly converges to a consistent state. Considering that communication lines are susceptible to interference, this paper further proposes an improved SOC power index droop control to overcome the effects of communication line failures. Considering the high cost of the energy storage unit, it should be connected to the DC microgrid in layers to achieve a reasonable allocation of resources in practical applications. In order to provide high-quality power to a large power grid, the quantification standards of the DC bus fluctuation range and the working range of each converter are further discussed to maximize the stability of the DC bus voltage and grid-connected power fluctuation. Full article
(This article belongs to the Special Issue Grid-Connected and Isolated Renewable Energy Systems)
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Review

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30 pages, 7197 KiB  
Review
AC-DC Converters for Electrolyzer Applications: State of the Art and Future Challenges
by Burin Yodwong, Damien Guilbert, Matheepot Phattanasak, Wattana Kaewmanee, Melika Hinaje and Gianpaolo Vitale
Electronics 2020, 9(6), 912; https://doi.org/10.3390/electronics9060912 - 29 May 2020
Cited by 71 | Viewed by 21443
Abstract
The main objective of the article is to provide a thorough review of currently used AC-DC converters for alkaline and proton exchange membrane (PEM) electrolyzers in power grid or wind energy conversion systems. Based on the current literature, this article aims at emphasizing [...] Read more.
The main objective of the article is to provide a thorough review of currently used AC-DC converters for alkaline and proton exchange membrane (PEM) electrolyzers in power grid or wind energy conversion systems. Based on the current literature, this article aims at emphasizing the advantages and drawbacks of AC-DC converters mainly based on thyristor rectifier bridges and chopper-rectifiers. The analysis is mainly focused on the current issues for these converters in terms of specific energy consumption, current ripple, reliability, efficiency, and power quality. From this analysis, it is shown that thyristors-based rectifiers are particularly fit for high-power applications but require the use of active and passive filters to enhance the power quality. By comparison, the association combination of the chopper-rectifier can avoid the use of bulky active and passive filters since it can improve power quality. However, the use of a basic chopper (i.e., buck converter) presents several disadvantages from the reliability, energy efficiency, voltage ratio, and current ripple point of view. For this reason, new emerging DC-DC converters must be employed to meet these important issues according to the availability of new power switching devices. Finally, based on the authors’ experience in power conversion for PEM electrolyzers, a discussion is provided regarding the future challenges that must face power electronics for green hydrogen production based on renewable energy sources. Full article
(This article belongs to the Special Issue Grid-Connected and Isolated Renewable Energy Systems)
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