Special Issue "Recent Advances in Electrical Power Engineering"

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Energy Systems".

Deadline for manuscript submissions: 20 May 2023 | Viewed by 4484

Special Issue Editors

Prof. Dr. Radomir Gono
E-Mail Website
Guest Editor
Department of Electrical Power Engineering, VSB - Technical University of Ostrava, 708 00 Ostrava, Czech Republic
Interests: reliability of electric power systems; optimization of maintenance; renewable energy sources
Dr. Tomáš Novák
E-Mail Website
Guest Editor
Department of Electrical Power Engineering, VSB - Technical University of Ostrava, 708 00 Ostrava, Czech Republic
Interests: public lighting; lighting pollutions; interior light controlling and smart city technologies
Dr. Petr Kacor
E-Mail Website
Guest Editor
Department of Electrical Power Engineering, VSB - Technical University of Ostrava, 708 00 Ostrava, Czech Republic
Interests: numerical methods and FEM; electrical machines and apparatuses
Dr. Petr Moldřík
E-Mail Website
Guest Editor
Department of Electrical Power Engineering, VSB - Technical University of Ostrava, 708 00 Ostrava, Czech Republic
Interests: alternative energy sources; hydrogen technology

Special Issue Information

Dear Colleagues,

The 22nd International Scientific Conference on Electric Power Engineering (EPE 2022) is aimed particularly at problems concerning power engineering science, research and work experience. Thus, the conference provides a platform for the interchange of valuable information, room for discussion and networking with industrial, academic and research workers.

This year´s conference is organized by VSB—Technical University of Ostrava, Department of Electrical Power Engineering, Faculty of Electrical Engineering and Computer Science.

The conference will be held from June 8 to 10, 2022 at hotel Dlouhe Strane in Kouty nad Desnou, Czech Republic.

The goals are to serve as a forum for the interchange of experience and the presentation of research findings and practical applications; and to provide a place of meeting for university scientists and industry workers who engage in research and technical activities. The conference focuses on key problems of today´s power engineering that stem from both technical and economic needs of the power industry. It also deals with research activities of development institutions and universities.

The selected peer-reviewed articles will be recommended for publication in a Special Issue of the journal Processes (ISBN: ISSN 2227-9717), which is indexed in well-established databases/archives (SCI, Scopus, etc.).

In this Special Issue, we seek advancements in electrical power technologies.

Prof. Dr. Radomir Gono
Dr. Tomáš Novák
Dr. Petr Kacor
Dr. Petr Moldřík
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. Processes is an international peer-reviewed open access monthly 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 2000 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

  • operation of electrical power systems
  • power stations
  • renewable energy
  • energy storage
  • control of electrical power systems
  • heating systems and intelligent buildings
  • electrical technology
  • electrical power transmission and distribution
  • smart grids/cities/technologies
  • electric lighting
  • reliability, maintenance and diagnostics
  • electrical machines and devices
  • power electronics
  • power system protection
  • information systems

Published Papers (7 papers)

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Research

Article
A Technique for Transformer Remnant Cellulose Life Cycle Prediction Using Adaptive Neuro-Fuzzy Inference System
Processes 2023, 11(2), 440; https://doi.org/10.3390/pr11020440 - 01 Feb 2023
Viewed by 197
Abstract
This article presents an ultramodern modelling algorithm for predicting the remnant cellulose life cycle for oil-submerged power transformers based on the adaptive neuro-fuzzy interference system (ANFIS). The polymer characteristics, degree of polymerization (DP), and 2-furaldehyde (2FAL) of 100 power transformers were measured and [...] Read more.
This article presents an ultramodern modelling algorithm for predicting the remnant cellulose life cycle for oil-submerged power transformers based on the adaptive neuro-fuzzy interference system (ANFIS). The polymer characteristics, degree of polymerization (DP), and 2-furaldehyde (2FAL) of 100 power transformers were measured and collated, which were apportioned into 70 training databanks and 30 as testing datasets. The remnant cellulose life cycle of the transformer was predicted using the proposed ANFIS model characterized by polymer characteristics, DP and 2FAL as inputs. The proposed approach returns 98.23% training and 99.86% testing reliability. The proposed model was applied to 10 transformer case studies in predicting their remnant cellulose life cycle. To corroborate the proposed ANFIS, a comparative study was carried out by employing existing approaches in predicting the remnant life cycle of the case studies, and significant error margins were observed. At large, the results presented in this article certify the dominance of the proposed ANFIS algorithm over compared models. The proposed ANFIS furnishes a pathway to obliterate the constraints of classical techniques in evaluating the transformer DP and remnant cellulose life cycle. Full article
(This article belongs to the Special Issue Recent Advances in Electrical Power Engineering)
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Article
Thin-Film Carbon Nitride (C2N)-Based Solar Cell Optimization Considering Zn1−xMgxO as a Buffer Layer
Processes 2023, 11(1), 91; https://doi.org/10.3390/pr11010091 - 29 Dec 2022
Viewed by 887
Abstract
Carbon nitride (C2N), a two-dimensional material, is rapidly gaining popularity in the photovoltaic (PV) research community owing to its excellent properties, such as high thermal and chemical stability, non-toxic composition, and low fabrication cost over other thin-film solar cells. This study [...] Read more.
Carbon nitride (C2N), a two-dimensional material, is rapidly gaining popularity in the photovoltaic (PV) research community owing to its excellent properties, such as high thermal and chemical stability, non-toxic composition, and low fabrication cost over other thin-film solar cells. This study uses a detailed numerical investigation to explore the influence of C2N-based solar cells with zinc magnesium oxide (Zn1−xMgxO) as a buffer layer. The SCAPS-1D simulator is utilized to examine the performance of four Mg-doped buffer layers (x = 0.0625, 0.125, 0.1875, and 0.25) coupled with the C2N-based absorber layer. The influence of the absorber and buffer layers’ band alignment, quantum efficiency, thickness, doping density, defect density, and operating temperature are analyzed to improve the cell performance. Based on the simulations, increasing the buffer layer Mg concentration above x = 0.1875 reduces the device performance. Furthermore, it is found that increasing the absorber layer thickness is desirable for good device efficiency, whereas a doping density above 1015 cm−3 can degrade the cell performance. After optimization of the buffer layer thickness and doping density at 40 nm and 1018 cm−3, the cell displayed its maximum performance. Among the four structures, C2N/Zn0.8125Mg0.1875O demonstrated the highest PCE of 19.01% with a significant improvement in open circuit voltage (Voc), short circuit density (Jsc), and fill factor (FF). The recorded results are in good agreement with the standard theoretical studies. Full article
(This article belongs to the Special Issue Recent Advances in Electrical Power Engineering)
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Article
Stochastic Approach for Increasing the PV Hosting Capacity of a Low-Voltage Distribution Network
Processes 2023, 11(1), 9; https://doi.org/10.3390/pr11010009 - 21 Dec 2022
Viewed by 540
Abstract
In recent years, the emerging fear of an energy crisis in central Europe has caused an increased demand for distributed energy resources (DER), especially small photovoltaic rooftop installations up to 10 kWp. From a technical point of view, distributed PV in low-voltage networks [...] Read more.
In recent years, the emerging fear of an energy crisis in central Europe has caused an increased demand for distributed energy resources (DER), especially small photovoltaic rooftop installations up to 10 kWp. From a technical point of view, distributed PV in low-voltage networks is associated with the risk of power quality violation, overvoltage, voltage unbalance, harmonics, and violation of the thermal limit of phase conductors, neutral conductors, and transformers. Distribution system operators (DSO) are currently in a position to determine the amount of installed PV power for which reliable and safe network operation is ensured, also known as the photovoltaic hosting capacity (PVHC). The presented study describes a stochastic methodology for PVHC estimation and uses it to analyze a typical LV rural network in the Slovak Republic. Detailed and precise calculations are performed on the 4-wire LV model with accurate results. In this study, we, thus, profoundly analyze the problems with voltage violation, unbalanced voltage energy losses, and the thermal loading effect of increasing PV penetration. The results show that overvoltage events are the main factor limiting the PVHC in LV systems. This conclusion is in accordance with the experience of the DSO in the Slovak and Czech Republic. Subsequently, the study focuses on the possibilities of increasing PVHC using those tools typically available for DSO, such as changes in PV inverter power factors and no-load tap changer transformers. The results are compared with those derived from similar analyses, but we ultimately find that the proposed solution is problematic due to the high variability of approaches and boundary conditions. In conclusion, the paper discusses the issue of the acceptable risk of overvoltage violation in the context of PVHC and lowering losses in LV networks. Full article
(This article belongs to the Special Issue Recent Advances in Electrical Power Engineering)
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Article
Analysis of Voltage Stability of the Slovak Republic’s Power System
Processes 2022, 10(12), 2613; https://doi.org/10.3390/pr10122613 - 06 Dec 2022
Viewed by 418
Abstract
This paper studies the voltage stability of the Slovak Republic’s power system (PS) based on an assessment of the PV curves. The PV curve is a tool for assessing voltage stability, and based on its shape, it is possible to determine weak and [...] Read more.
This paper studies the voltage stability of the Slovak Republic’s power system (PS) based on an assessment of the PV curves. The PV curve is a tool for assessing voltage stability, and based on its shape, it is possible to determine weak and strong voltage nodes with the possibility of voltage stability reserve quantification. We present an analysis of the influence of transformers with an automatic voltage regulator (AVR) on the shape of the PV curves and on the magnitude of voltage in the PS. In general, the 400 kV/110 kV transformers equipped with AVRs are critical assets for the PS as they address voltage control in the DS. However, in the case of voltage problems in the TS, the AVR function may worsen the voltage situation across the entire PS. Therefore, we closely analyze the negative effects of the AVR on the PS operation. This impact is clearly proved, and recommendations are given for the transmission system operator (TSO) in order to maintain voltage stability. In addition, the PV curves of the pilot nodes are analyzed very accurately, thereby confirming their importance in the TS in terms of a sufficient reserve of reactive power. The study was conducted in cooperation with the TSO, Slovenská elektrizačná prenosová sústava, a.s. Full article
(This article belongs to the Special Issue Recent Advances in Electrical Power Engineering)
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Article
Investigating the Possibilities for Simulation of the Interconnected Electric Power and Communication Infrastructures
Processes 2022, 10(12), 2504; https://doi.org/10.3390/pr10122504 - 25 Nov 2022
Viewed by 671
Abstract
In recent years, we have seen an increasing dependency between different urban critical infrastructures, which raises the demands on their analysis and cybersecurity. Current open-source solutions do not provide simulations of interconnected data networks and power grids, which are essential for analysing of [...] Read more.
In recent years, we have seen an increasing dependency between different urban critical infrastructures, which raises the demands on their analysis and cybersecurity. Current open-source solutions do not provide simulations of interconnected data networks and power grids, which are essential for analysing of both infrastructures weak parts and reducing the risk of emerging threats. The main purpose of this paper is to describe the design of a simulation platform that provides this type of simulation to customers using the virtual user interface. The paper describes the development of a complex model of interconnected power and data infrastructures. Created virtualization platform that consists of several open-source tools is described in detail. Outputs of this paper can be used for analysis of critical infrastructures at the level of urban networks. Full article
(This article belongs to the Special Issue Recent Advances in Electrical Power Engineering)
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Article
Battery Hybrid Energy Storage Systems for Full-Electric Marine Applications
Processes 2022, 10(11), 2418; https://doi.org/10.3390/pr10112418 - 16 Nov 2022
Viewed by 642
Abstract
The high cost of Lithium-ion battery systems is one of the biggest challenges hindering the wide adoption of electric vessels. For some marine applications, battery systems based on the current monotype topologies are significantly oversized due to variable operational profiles and long lifespan [...] Read more.
The high cost of Lithium-ion battery systems is one of the biggest challenges hindering the wide adoption of electric vessels. For some marine applications, battery systems based on the current monotype topologies are significantly oversized due to variable operational profiles and long lifespan requirements. This paper deals with the battery hybrid energy storage system (HESS) for an electric harbor tug to optimize the size of the battery system. The impact of battery hybridization was investigated on three key performance indicators inclusive of cost, system efficiency, and battery weight. The design life of the battery system is considered to be 10 years, and NMC and LTO cell technologies are used as high-energy (HE) and high-power (HP) battery cells. The HESS design is based on a parallel full-active architecture with a rule-based energy management strategy. The results of this research indicate that battery hybridization can reduce the system cost by around 28% and 14% in comparison with a monotype battery with LTO and NMC cells, respectively. Although no noticeable difference in system efficiency is observed between the monotype system and HESS, battery hybridization reduces the total weight of the battery cells by more than 30% compared to monotype topology. This study implies that the hybridization of battery systems could be a promising solution to reduce the cost and weight of large battery packs in electric vessels. Full article
(This article belongs to the Special Issue Recent Advances in Electrical Power Engineering)
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Article
Frequency-Dependent Dielectric Spectroscopy of Insulating Nanofluids Based on GTL Oil during Accelerated Thermal Aging
Processes 2022, 10(11), 2405; https://doi.org/10.3390/pr10112405 - 15 Nov 2022
Viewed by 416
Abstract
Improving the dielectric properties of liquid-insulating materials is a current problem in research into the insulation system of a power transformer. Modern optimization of insulating liquids involves the potential use of unique synthetic esters enriched with nanoparticles. This study presents the results of [...] Read more.
Improving the dielectric properties of liquid-insulating materials is a current problem in research into the insulation system of a power transformer. Modern optimization of insulating liquids involves the potential use of unique synthetic esters enriched with nanoparticles. This study presents the results of the dielectric response of liquefied gas-based (GTL) insulating liquids during accelerated thermal aging. The dielectric relaxation spectroscopy method was used in the frequency domain to point out power losses as an imaginary part of a complex electric modulus. The relaxation spectra express the validity of applying this complex dielectric parameter. The polarization processes of the base oil alternately change position in the low-frequency band during thermal aging. Fullerene nanofluid undergoes three phases of dielectric loss changes during thermal aging. In the case of magnetic nanofluid, the effect of electric double-layer polarization disappeared after 500 h of thermal aging. It was found that with the gradual increase in the thermal aging time, there is no gradual increase in the dielectric losses investigated in the measured frequency spectrum. This study shows that the concentration of the two types of nanoparticles independently causes a different dielectric response to an applied AC electric field in the GTL base fluid. Full article
(This article belongs to the Special Issue Recent Advances in Electrical Power Engineering)
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