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Advances in Electrical Power Engineering—Select papers from 53rd International Universities Power Engineering Conference (UPEC2018)

A special issue of Energies (ISSN 1996-1073).

Deadline for manuscript submissions: closed (10 January 2019) | Viewed by 29820

Special Issue Editor

Prof. Dr. Mohamed Emad Farrag

E-Mail Website
Guest Editor
School of Computing, Engineering and Built Environment, Glasgow Caledonian University, Glasgow G4 0BA, UK
Interests: electrical and electronics; power system control; distributed generation; energy storage systems; smart grid
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue will consist of selected papers from the 53rd International Universities Power Engineering Conference (UPEC2018), which will be held at Glasgow Caledonian University, Scotland, UK, 4th–7th September, 2018.

UPEC is a long-established conference, which is very popular with young researchers, PhD students and engineers from the electrical power industry. The aim of the conference is to allow participants to exchange experiences and discuss the most up-to-date topics in power engineering.

The global energy challenges, the ageing of electrical networks in industrial countries, and the extension of the grid system in developing countries require significant research input in the area. UPEC is an ideal forum to address some of these issues, and to network and meet with talented engineers and innovators in these areas.

The subject areas covered include, but are not restricted to:

  • Power Systems Operations and Control
  • Distributed Generations
  • Renewable Energy Systems
  • Power Systems Simulation and Analysis
  • Smart Grids
  • Integration of Renewable Sources
  • Power Quality
  • Electricity Markets
  • Protection Systems
  • Electromagnetics and Electrostatics
  • Reliability Analysis
  • HVDC, FACTS and Power Electronics
  • ICT for Future Electricity Grids
  • High Voltage Engineering
  • Electrical Machines and Drives
  • Electric Vehicles and Transport
  • Condition Monitoring and Diagnostics
  • Electrical Services for Buildings
  • Transient Analysis and EMTP Modelling
  • Power Engineering Education
  • Energy Storage

More information about UPEC2018 can be found at: www.upec2018.com.

Dr. Mohamed Emad Farrag
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 papers will be 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.

The submitted manuscripts should contains at least 50% new material compared with the previous conference/workshop version, and it is not currently under consideration nor previously published in any other journal. 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 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 1600 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.

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Related Special Issues

Published Papers (7 papers)

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Research

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16 pages, 13212 KiB  
Article
A Harmonic Based Pilot Protection Scheme for VSC-MTDC Grids with PWM Converters
by Mani Ashouri, Filipe Faria da Silva and Claus Leth Bak
Energies 2019, 12(6), 1010; https://doi.org/10.3390/en12061010 - 15 Mar 2019
Cited by 14 | Viewed by 2752
Abstract
This paper presents a selective harmonic-based pilot protection scheme for detecting faults happened in the DC transmission section of VSC-MTDC grids with pulse width modulation (PWM) voltage source converters (VSCs). When a DC fault occurs in VSC-MTDC grids with PWM converters, first carrier [...] Read more.
This paper presents a selective harmonic-based pilot protection scheme for detecting faults happened in the DC transmission section of VSC-MTDC grids with pulse width modulation (PWM) voltage source converters (VSCs). When a DC fault occurs in VSC-MTDC grids with PWM converters, first carrier frequency harmonic (FCFH) currents will be generated by all VSCs through the grid. FCFH currents have different flowing directions depending on the characteristics and the location of the fault. According to the characteristics of the existing FCFH in the fault currents, a selective pilot protection algorithm is designed for VSC-MTDC grids. Considering the internal and external DC transmission faults for specific zones, and the circulating flow of FCFH current in the DC link capacitors, the relays cannot detect FCFH currents for external faults, while for the internal faults, FCFH currents are clearly detected. To design the selective protection algorithm, Hilbert-Huang transform (HHT) is used to detect the instantaneous frequency and the instantaneous amplitude of the high frequency intrinsic mode function (IMF)s, which are extracted from the fault current waves. Multiple faults with different characteristics are applied to CIGRE DCS-2 VSC-MTDC grid with two-level and three-level VSCs modeled in PSCAD, and the HHT-based selective protection scheme is designed in MATLAB. According to the results, the proposed algorithm can truly discriminate between internal and external faults. Full article
(This article belongs to the Special Issue Advances in Electrical Power Engineering—Select papers from 53rd International Universities Power Engineering Conference (UPEC2018))
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21 pages, 8298 KiB  
Article
An Estimation Model with Generalization Characteristics for the Internal Impedance of the Rechargeable Batteries by Means of Dual ANN Model
by Minella Bezha, Ryo Gondo and Naoto Nagaoka
Energies 2019, 12(5), 948; https://doi.org/10.3390/en12050948 - 12 Mar 2019
Cited by 6 | Viewed by 3569
Abstract
An estimation method of equivalent circuit parameters for rechargeable batteries that follows Artificial Neural Network (ANN) logic is proposed in this paper. The capability of the nonlinear analysis of the ANN is suitable for estimating the parameters that are nonlinearly involved in the [...] Read more.
An estimation method of equivalent circuit parameters for rechargeable batteries that follows Artificial Neural Network (ANN) logic is proposed in this paper. The capability of the nonlinear analysis of the ANN is suitable for estimating the parameters that are nonlinearly involved in the complex circuit equation. The parameters have to be obtained from the complex internal impedances, which are measured in a wide frequency range. The accuracy is improved by dividing this wide range into a low-frequency and a high-frequency region. These regions are strongly related to the capacity fade and the maximum chargeable/dischargeable current, respectively. The improved method will determine the optimal frequency region for three different rechargeable batteries, which are composed of Li-Ion, Pb and Ni-MH. The accuracy of the proposed method is confirmed by a comparison with the measured results obtained using a conventional frequency domain method. For obtaining the real-time diagnostics of the battery, an improved dual ANN system, which employs unequal sampling, is proposed to obtain the circuit parameters. The deterioration of a battery can be detected from the estimated parameters, which can help in further investigations that aim to develop diagnostic models for the embedded circuit in industrial applications. Full article
(This article belongs to the Special Issue Advances in Electrical Power Engineering—Select papers from 53rd International Universities Power Engineering Conference (UPEC2018))
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23 pages, 3749 KiB  
Article
Global Maximum Power Point Tracking under Shading Condition and Hotspot Detection Algorithms for Photovoltaic Systems
by Jirada Gosumbonggot and Goro Fujita
Energies 2019, 12(5), 882; https://doi.org/10.3390/en12050882 - 7 Mar 2019
Cited by 25 | Viewed by 4937
Abstract
Photovoltaic (PV) technology has been gaining an increasing amount of attention as a renewable energy source. Irradiation and temperature are the two main factors which impact on PV system performance. When partial shading from the surroundings occurs, its incident shadow diminishes the irradiation [...] Read more.
Photovoltaic (PV) technology has been gaining an increasing amount of attention as a renewable energy source. Irradiation and temperature are the two main factors which impact on PV system performance. When partial shading from the surroundings occurs, its incident shadow diminishes the irradiation and reduces the generated power. Moreover, shading affects the pattern of the power–voltage (P–V) characteristic curve to contain more than one power peak, causing difficulties when developing maximum power point tracking. Consequently, shading leads to a hotspot in which spreading the hotspot widely on the PV panel’s surface increases the heat and causes damage to the panel. Since it is not possible to access the circuit inside the PV cells, indirect measurement and fault detection methods are needed to perform them. This paper proposes the global maximum power point tracking method, including the shading detection and tracking algorithm, using the trend of slopes from each section of the curve. The effectiveness was confirmed from the dynamic short-term testing and real weather data. The hotspot-detecting algorithm is also proposed from the analysis of different PV arrays’ configuration, which is approved by the simulation’s result. Each algorithm is presented using the full mathematical equations and flowcharts. Results from the simulation show the accurate tracking result along with the fast-tracking response. The simulation also confirms the success of the proposed hotspot-detection algorithm, confirmed by the graphical and numerical results. Full article
(This article belongs to the Special Issue Advances in Electrical Power Engineering—Select papers from 53rd International Universities Power Engineering Conference (UPEC2018))
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23 pages, 11845 KiB  
Article
Comparative Assessment of Priority Listing and Mixed Integer Linear Programming Unit Commitment Methods for Non-Interconnected Island Systems
by Georgios N. Psarros and Stavros A. Papathanassiou
Energies 2019, 12(4), 657; https://doi.org/10.3390/en12040657 - 18 Feb 2019
Cited by 16 | Viewed by 3135
Abstract
The generation management concept for non-interconnected island (NII) systems is traditionally based on simple, semi-empirical operating rules dating back to the era before the massive deployment of renewable energy sources (RES), which do not achieve maximum RES penetration, optimal dispatch of thermal units [...] Read more.
The generation management concept for non-interconnected island (NII) systems is traditionally based on simple, semi-empirical operating rules dating back to the era before the massive deployment of renewable energy sources (RES), which do not achieve maximum RES penetration, optimal dispatch of thermal units and satisfaction of system security criteria. Nowadays, more advanced unit commitment (UC) and economic-dispatch (ED) approaches based on optimization techniques are gradually introduced to safeguard system operation against severe disturbances, to prioritize RES participation and to optimize dispatch of the thermal generation fleet. The main objective of this paper is to comparatively assess the traditionally applied priority listing (PL) UC method and a more sophisticated mixed integer linear programming (MILP) UC optimization approach, dedicated to NII power systems. Additionally, to facilitate the comparison of the UC approaches and quantify their impact on systems security, a first attempt is made to relate the primary reserves capability of each unit to the maximum acceptable frequency deviation at steady state conditions after a severe disturbance and the droop characteristic of the unit’s speed governor. The fundamental differences between the two approaches are presented and discussed, while daily and annual simulations are performed and the results obtained are further analyzed. Full article
(This article belongs to the Special Issue Advances in Electrical Power Engineering—Select papers from 53rd International Universities Power Engineering Conference (UPEC2018))
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26 pages, 8870 KiB  
Article
Low-Cost Monitoring of Synchrophasors Using Frequency Modulation
by Stephen Robson, Gan Tan and Abderrahmane Haddad
Energies 2019, 12(4), 611; https://doi.org/10.3390/en12040611 - 15 Feb 2019
Cited by 5 | Viewed by 4283
Abstract
A new, low-cost method of simultaneously measuring and communicating voltage and current on distribution networks is presented. Based on Frequency Modulation (FM) of the measured fundamental frequency (and harmonics), followed by immediate re-injection of the modulated waveform back into the network, the proposed [...] Read more.
A new, low-cost method of simultaneously measuring and communicating voltage and current on distribution networks is presented. Based on Frequency Modulation (FM) of the measured fundamental frequency (and harmonics), followed by immediate re-injection of the modulated waveform back into the network, the proposed method can be implemented using inexpensive and readily available electronics. Furthermore, the method does not require a separate communication media, but instead uses the power line itself to propagate the FM signals back to a central point. EMTP-ATP simulations on a mixed LV/MV network are performed and experimental analysis demonstrates the practicality and robustness of the new method. The low-cost of the method would suit deployment on parts of the network which are otherwise overlooked for monitoring. Full article
(This article belongs to the Special Issue Advances in Electrical Power Engineering—Select papers from 53rd International Universities Power Engineering Conference (UPEC2018))
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15 pages, 3625 KiB  
Article
Mapping and Analysis of the Reactive Power Balance in the Danish Transmission Network
by Mads Øbro Nannestad, Zhe Zhang, Jundi Jia, Emil Kjær Jensen and Peter Jan Randewijk
Energies 2019, 12(3), 419; https://doi.org/10.3390/en12030419 - 29 Jan 2019
Viewed by 3144
Abstract
This paper investigates the reactive power balance of the Zealand side of the Danish transmission system (DK2) by using QV-curves. The study is performed in cooperation with Energinet, who is the Danish transmission system operator (TSO). Firstly, this paper aims to map the [...] Read more.
This paper investigates the reactive power balance of the Zealand side of the Danish transmission system (DK2) by using QV-curves. The study is performed in cooperation with Energinet, who is the Danish transmission system operator (TSO). Firstly, this paper aims to map the reactive power balance with the current challenges in the system, which appears due to a decision of changing overhead lines in the scenic area to cables. Secondly, a method is derived for obtaining a comprehensive overview of the impacts that future projects might have on the system. By dividing the transmission system into smaller areas, it is possible to analyze how the reactive power will affect the voltage; moreover, it is favorable to analyze and handle the challenges in the reactive power balance locally. This helps the TSO to quickly determine the lack of reactive power devices and issues that might occur in future expansions of the system. For this paper, a full-scale model of DK2 and SCADA-data has been utilized. It covers the period from 01-01-2016 to 20-08-2017 between the TSO and the Distribution System Operator (DSO). The studies have shown how the location of the wind production will create issues in the reactive power balance. Full article
(This article belongs to the Special Issue Advances in Electrical Power Engineering—Select papers from 53rd International Universities Power Engineering Conference (UPEC2018))
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Review

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30 pages, 4356 KiB  
Review
System Configuration, Fault Detection, Location, Isolation and Restoration: A Review on LVDC Microgrid Protections
by Waqas Javed, Dong Chen, Mohamed Emad Farrag and Yan Xu
Energies 2019, 12(6), 1001; https://doi.org/10.3390/en12061001 - 14 Mar 2019
Cited by 60 | Viewed by 7153
Abstract
Low voltage direct current (LVDC) distribution has gained the significant interest of research due to the advancements in power conversion technologies. However, the use of converters has given rise to several technical issues regarding their protections and controls of such devices under faulty [...] Read more.
Low voltage direct current (LVDC) distribution has gained the significant interest of research due to the advancements in power conversion technologies. However, the use of converters has given rise to several technical issues regarding their protections and controls of such devices under faulty conditions. Post-fault behaviour of converter-fed LVDC system involves both active converter control and passive circuit transient of similar time scale, which makes the protection for LVDC distribution significantly different and more challenging than low voltage AC. These protection and operational issues have handicapped the practical applications of DC distribution. This paper presents state-of-the-art protection schemes developed for DC Microgrids. With a close look at practical limitations such as the dependency on modelling accuracy, requirement on communications and so forth, a comprehensive evaluation is carried out on those system approaches in terms of system configurations, fault detection, location, isolation and restoration. Full article
(This article belongs to the Special Issue Advances in Electrical Power Engineering—Select papers from 53rd International Universities Power Engineering Conference (UPEC2018))
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