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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 13506

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Prof. Dr. Dan Doru Micu

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Department of Electrotechnics and Measurements, Faculty of Electrical Engineering, Technical University of Cluj-Napoca, 400114 Cluj-Napoca, Romania
Interests: numerical methods and modelling techniques in electromagnetics; artificial intelligence algorithms and inverse problems; electromagnetic field analysis; synthesis and optimization; energy efficiency solutions
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Special Issue Information

Dear Colleagues,

The Guest Editor is inviting submissions to a Special Issue of Energies on the subject area of “Simulation and Analysis of High-Voltage Engineering in Power Systems”.

This Special Issue aims at encouraging researchers to address important issues regarding the modelling and simulation tools and techniques that are applied in high-voltage engineering in modern power systems. Prospective authors are kindly encouraged to contribute to and help shape the Special Issue through submissions of their high-quality research contributions describing original and unpublished results of conceptual, constructive, empirical, experimental, or theoretical work in the area of ‘’Simulation and Analysis of High Voltage Engineering in Power Systems’’.

Topics of interest for publication include but are not limited to the following:

Electrostatic simulation for different HV applications;
Simulation and analysis of lightning-induced effects in power systems and transients phenomena;
Simulation, modelling, and evaluation of high-voltage power systems;
High-voltage/triggered lightning experiments for simulation of lightning effects;
High voltage power distribution and storage;
High-voltage engineering education;
Electromagnetic compatibility in high-voltage engineering;
Numerical methods applied in high-voltage engineering;
High-voltage power system management maintenance;
High-voltage power systems research.

Prof. Dr. Dan Doru Micu
Guest Editor

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

High-voltage engineering
Power systems
Analysis methods and simulation tools
Lightning and transients phenomena
Numerical methods
Electrostatic fields.

Published Papers (5 papers)

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Research

17 pages, 7824 KiB

Open AccessArticle

Artificial Negative Polarity Thunderstorm Cell Modeling of Nearby Incomplete Upward Discharges’ Influence on Elements of Monitoring Systems for Air Transmission Lines

by Nikolay Lysov, Alexander Temnikov, Leonid Chernensky, Alexander Orlov, Olga Belova, Tatiana Kivshar, Dmitry Kovalev and Vadim Voevodin

Energies 2021, 14(21), 7100; https://doi.org/10.3390/en14217100 - 31 Oct 2021

Cited by 2 | Viewed by 1443

Abstract

The article represents results of a physical simulation of incomplete upward leader discharges induced on air transmission lines’ elements, using charged artificial thunderstorm cells of negative polarity. The influence of such discharges on closely located model sensors (both of rod and elongated types) of digital monitoring systems, as well as on the models of receiver-transmission systems of local data collection (antennas), was determined. Effect of heterogeneity of electromagnetic field caused by incomplete upward discharges on frequency specter of signals generated on sensors and antennas was estimated. Wavelet analysis was carried out to determine the basic frequency diapasons of such signals. Based on experimental data obtained, suppositions about the extent of influence of nearby incomplete leader discharges on the functioning of currently used systems of transmission lines’ monitoring were made. Full article

(This article belongs to the Special Issue Simulation and Analysis of High Voltage Engineering in Power Systems)

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14 pages, 3170 KiB

Open AccessArticle

Impact of Cable Configuration on the Voltage Induced in Cable Screen during Work with One-Sidedly Ungrounded Cable Screen

by Aleksandra Schött-Szymczak and Krzysztof Walczak

Energies 2021, 14(14), 4263; https://doi.org/10.3390/en14144263 - 14 Jul 2021

Cited by 2 | Viewed by 1565

Abstract

In the latest research, it has been proven that from the point of view of losses in a cable distribution line, the most advantageous operation is to work with two or one phase of metallic cable screen ungrounded. However, such an operation may cause changes in the network characteristics and thus the occurrence of undesirable phenomena. One of those characteristics is the overvoltages in those cable screens, which can lead to cable line damage. The simulation tests presented in this article are closely related to the unusual method of operation of the MV cable screens and their performance, and they address the question of whether in a given system ground fault overvoltages may be a significant threat to the operation of the cable. The research methods used to verify these risks are related to the simulation of the cable line operating states using the DIgSILENT PowerFactory program (DIgSILENT GmbH, Gomaringen, Germany). Overvoltage simulations were performed, taking into account changes in the network configuration, such as the method of cable screens grounding, the length of cable lines, the cross-section of the conductor and cable screen, or the method of operation of the neutral point. The results for the cable line modeled as a part of the MV network with the variables considered during the tests indicate the possible impact of the one-sidedly cable screen ungrounding on overvoltages in this cable screen. The obtained results at the level of a few kV in one-sidedly ungrounded cable screens show that the change of the configuration of the operation of these cable screens may affect the safety of the network operation. Full article

(This article belongs to the Special Issue Simulation and Analysis of High Voltage Engineering in Power Systems)

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14 pages, 3628 KiB

Open AccessArticle

Correct Cross-Section of Cable Screen in a Medium Voltage Collector Network with Isolated Neutral of a Wind Power Plant

by Huthaifa A. Al_Issa, Mohamed Qawaqzeh, Alaa Khasawneh, Roman Buinyi, Viacheslav Bezruchko and Oleksandr Miroshnyk

Energies 2021, 14(11), 3026; https://doi.org/10.3390/en14113026 - 24 May 2021

Cited by 17 | Viewed by 2770

Abstract

The article discusses the selection of cables for power lines connecting wind turbine generators at the wind power plant. The screen cross-section of these cables should be selected considering the value of the screen current at double line-to-earth fault. To calculate this current, the dimensions of the cable should be known. However, these parameters are hidden and cannot be used during designing. Therefore, a highly simplified method is currently used in practice. It is shown that the errors from the highly simplified method are up to 33%. Authors propose a simplified method based on open data of cable manufacturers. The proposed method is compared with simulation results of a common model of cable power line and takes into account self and mutual inductances of the cores and screens. It is shown that the error of the proposed method is smaller than 4.0% for real cable power lines at wind power plants. However, for a long section of cable power line (2.5 km) the error of calculation might increase up to 6.3%. This allows us to use the proposed method for designing. In addition, the authors show how the results of the highly simplified method can be corrected to improve accuracy. Full article

(This article belongs to the Special Issue Simulation and Analysis of High Voltage Engineering in Power Systems)

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18 pages, 11031 KiB

Open AccessArticle

Resonant Power Frequency Converter and Application in High-Voltage and Partial Discharge Test of a Voltage Transformer

by Banyat Leelachariyakul and Peerawut Yutthagowith

Energies 2021, 14(7), 2014; https://doi.org/10.3390/en14072014 - 5 Apr 2021

Cited by 11 | Viewed by 2816

Abstract

This paper presents application of a resonant power frequency converter for high-voltage (HV) and partial discharge (PD) test of a voltage transformer. The rating voltage, power, and frequency of the system are 70 kV_rms, 40 kVA, and 200 Hz, respectively. The testing system utilized the converter feeding to an HV testing transformer connected to a conventional partial discharge detection system. The converter system comprising a rectifier and insulated-gate bipolar (IGBT) switches with the H-bridge configuration was applied as a low-voltage source instead of a conventional motor-generator test set which requires large space and high cost. The requirements of the test according to the standards are quality of the test voltage and the background noise level. The required voltage must have the different voltage (DV) and total harmonic distortion (THD_v) in the acceptable values of less than 5%. The DV is defined as the difference of the root mean square and peak voltages in percent. The required background noise level must be lower than 2.5 pC. Simulations and experiments were performed for verification of the developed system performance in comparison with those of the previously developed system based on the pulse width modulation converter. It is found that the developed system can provide the testing voltage with the DV and the THD_v of lower than 1% and the background noise level of lower than 1 pC. Considering this achievement of promising performance, the developed system is an attractive choice for the HV and PD testing of voltage transformers in real practice. Full article

(This article belongs to the Special Issue Simulation and Analysis of High Voltage Engineering in Power Systems)

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34 pages, 32290 KiB

Open AccessArticle

Optimized Protection of Pole-Mounted Distribution Transformers against Direct Lightning Strikes

by Mahdi Pourakbari-Kasmaei, Farhan Mahmood and Matti Lehtonen

Energies 2020, 13(17), 4372; https://doi.org/10.3390/en13174372 - 24 Aug 2020

Cited by 3 | Viewed by 3381

Abstract

Direct lightning strikes on overhead phase conductors result in high overvoltage stress on the medium voltage (MV) terminals of pole-mounted transformers, which may cause considerable damage. Therefore, introducing an efficient protection strategy would be a remedy for alleviating such undesirable damages. This paper investigates the optimized protection of MV transformers against direct lightning strikes on the phase conductors. To this end, first, the impacts of grounding densities (number of grounded intermediate poles between every two successive transformer poles) on the probability of overvoltage stress on transformer terminals are investigated. Then, the implications of guy wire, as a supporting device for ungrounded intermediate poles, on reducing the overvoltage stress on transformers, are studied. Finally, the role of a surge arrester in mitigating the overvoltage stress of non-surge-arrester-protected transformer poles is scrutinized. The investigations are conducted on a sample MV network with 82 wood poles comprising 17 pole-mounted transformers protected by spark gaps. To provide in-depth analysis, two different poles, namely creosote- and arsenic-impregnated poles, are considered under wet and dry weather conditions. A sensitivity analysis is performed on grounding distances and on a combination of guy wire and grounded intermediate poles while taking into account soil ionization. The results provide a clear picture for the system operator in deciding how many grounded intermediate poles might be required for a system to reach the desired probabilities of transformers experiencing overvoltage stress and how the surge arrester and guy wires contribute to mitigating undesirable overvoltage stress. Full article

(This article belongs to the Special Issue Simulation and Analysis of High Voltage Engineering in Power Systems)

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