Special Issue "Symmetry in Renewable Energy and Power Systems"

A special issue of Symmetry (ISSN 2073-8994).

Deadline for manuscript submissions: 29 February 2020.

Special Issue Editors

Prof. Dr. Raúl Baños Navarro
E-Mail Website
Guest Editor
University of Almería, 04120 Almería, Spain
Interests: electrical engineering; renewable energy; computational optimization; engineering optimization; network optimization
Special Issues and Collections in MDPI journals
Dr. Alfredo Alcayde
E-Mail Website
Guest Editor
Department of Engineering, Universidad de Almería; La Cañada de San Urbano s/n; 04120 Almería, Spain
Interests: electrical engineering; power systems; renewable energy; optimization
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

The study of power systems is closely related with symmetry. For example, multiphase power systems are inherently symmetric. The study of symmetrical and asymmetrical faults in power systems is a critical issue. The phase sequence arrangements of multicircuit overhead lines on the same tower directly affects the symmetry of power transmission systems, which influence the operation of power grid and relay protection. Moreover, symmetry is a topic of intensive investigation in the analysis of grid interconnection, including symmetrical and asymmetrical network parameters in smart-grid infrastructures. In renewable energy, the symmetry is present in the layout of wind power plants or photovoltaic plants, among others, while solar systems can have a different performance if they are used with symmetric and asymmetric concentrating CPC collectors.

This Special Issue invites researchers to submit original research papers and review articles related to renewable energy and power systems in which theoretical or practical issues of symmetry are considered. Applied case studies are especially welcome. The topics of interest include but are not limited to:

  • Symmetry in the topology of power grids;
  • Symmetry in multiphase/polyphase power systems. Power network synchronization;
  • Symmetric and asymmetric components;
  • Symmetrical and asymetrical faults in power systems;
  • Symmetry analysis of phase sequence arrangements of multicircuit overhead lines;
  • Symmetry studies of electrical signals using signal processing methods (FFT, DFT, STFT, WT, etc.);
  • Symmetry in power electronics devices and renewable energy components;
  • Symmetry in renewable energy systems (including smart-grids and micro-grids);
  • Symmetrical analysis of power plant layouts and location (including wind farms and photovoltaic plants);
  • Algorithms for studying symmetry in renewable energy and power systems.

Prof. Raúl Baños
Dr. Alfredo Alcayde
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 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.

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. Symmetry 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 1400 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

  • symmetry
  • power systems
  • renewable energy systems
  • topology
  • smart-grids

Published Papers (3 papers)

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Research

Open AccessArticle
Evolutionary Algorithms for Community Detection in Continental-Scale High-Voltage Transmission Grids
Symmetry 2019, 11(12), 1472; https://doi.org/10.3390/sym11121472 - 03 Dec 2019
Abstract
Symmetry is a key concept in the study of power systems, not only because the admittance and Jacobian matrices used in power flow analysis are symmetrical, but because some previous studies have shown that in some real-world power grids there are complex symmetries. [...] Read more.
Symmetry is a key concept in the study of power systems, not only because the admittance and Jacobian matrices used in power flow analysis are symmetrical, but because some previous studies have shown that in some real-world power grids there are complex symmetries. In order to investigate the topological characteristics of power grids, this paper proposes the use of evolutionary algorithms for community detection using modularity density measures on networks representing supergrids in order to discover densely connected structures. Two evolutionary approaches (generational genetic algorithm, GGA+, and modularity and improved genetic algorithm, MIGA) were applied. The results obtained in two large networks representing supergrids (European grid and North American grid) provide insights on both the structure of the supergrid and the topological differences between different regions. Numerical and graphical results show how these evolutionary approaches clearly outperform to the well-known Louvain modularity method. In particular, the average value of modularity obtained by GGA+ in the European grid was 0.815, while an average of 0.827 was reached in the North American grid. These results outperform those obtained by MIGA and Louvain methods (0.801 and 0.766 in the European grid and 0.813 and 0.798 in the North American grid, respectively). Full article
(This article belongs to the Special Issue Symmetry in Renewable Energy and Power Systems)
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Open AccessArticle
Geometric Algebra in Nonsinusoidal Power Systems: A Case of Study for Passive Compensation
Symmetry 2019, 11(10), 1287; https://doi.org/10.3390/sym11101287 - 14 Oct 2019
Abstract
New-generation power networks, such as microgrids, are being affected by the proliferation of nonlinear electronic systems, resulting in harmonic disturbances both in voltage and current that affect the symmetry of the system. This paper presents a method based on the application of geometric [...] Read more.
New-generation power networks, such as microgrids, are being affected by the proliferation of nonlinear electronic systems, resulting in harmonic disturbances both in voltage and current that affect the symmetry of the system. This paper presents a method based on the application of geometric algebra (GA) to the resolution of power flow in nonsinusoidal single-phase electrical systems for the correct determination of its components to achieve passive compensation of true quadrature current. It is demonstrated that traditional techniques based on the concepts of Budeanu, Fryze or IEEE1459 fail to determine the interaction between voltage and current and therefore, are not suitable for being used as a basis for the compensation of nonactive power components. An example is included that demonstrates the superiority of GA method and is compared to previous work where GA approaches and traditional methods have also been used. Full article
(This article belongs to the Special Issue Symmetry in Renewable Energy and Power Systems)
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Open AccessArticle
A Hybrid Active Filter Using the Backstepping Controller for Harmonic Current Compensation
Symmetry 2019, 11(9), 1161; https://doi.org/10.3390/sym11091161 - 12 Sep 2019
Abstract
This document presents a new hybrid combination of filters using passive and active elements because of the generalization in the use of non-linear loads that generate harmonics directly affecting the symmetry of energy transmission systems that influence the functioning of the electricity grid [...] Read more.
This document presents a new hybrid combination of filters using passive and active elements because of the generalization in the use of non-linear loads that generate harmonics directly affecting the symmetry of energy transmission systems that influence the functioning of the electricity grid and, consequently, the deterioration of power quality. In this context, active power filters represent one of the best solutions for improving power quality and compensating harmonic currents to get a symmetrical waveform. In addition, given the importance and occupation of the transmission network, it is necessary to control the stability of the system. Traditionally, passive filters were used to improve energy quality, but they have endured problems such as resonance, fixed remuneration, etc. In order to mitigate these problems, a hybrid HAPF active power filter is proposed combining a parallel active filter and a passive filter controlled by a backstepping algorithm strategy. This control strategy is compared with two other methods, namely the classical PI control, and the fuzzy logic control in order to verify the effectiveness and the level of symmetry of the backstepping controller proposed for the HAPF. The proposed backstepping controller inspires the notion of stability in Lyapunov’s sense. This work is carried out to improve the performance of the HAPF by the backstepping command. It perfectly compensates the harmonics according to standards. The results of simulations performed under the Matlab/Simulink environment show the efficiency and robustness of the proposed backstepping controller applied on HAPF, compared to other control methods. The HAPF with the backstepping controller shows a significant decrease in the THD harmonic distortion rate. Full article
(This article belongs to the Special Issue Symmetry in Renewable Energy and Power Systems)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Type: Article
Title: A new method to avoid shadows at CSP facilities
Authors: Francisco Manzano-Agugliaro 1,*, Aránzazu Fernández-García 2, Nuria Novas 1
Affiliations:
1 Department of Engineering, University of Almeria, ceiA3, 04120 Almeria, Spain; [email protected] (F.M-A.); [email protected] (N.N.)
2 CIEMAT-Plataforma Solar de Almería, Ctra. Senés, 04200 Tabernas, Spain; [email protected] (A.F-G.)
* Correspondence: [email protected]; Tel.: +34-950-015396; Fax: +34-950-015491
Abstract: Renewable energy today is no longer just an affordable alternative, but a requirement for mitigating global environmental problems such as climate change. Among renewable energies, the use of solar energy is one of the most widespread. Concentrating Solar Power (CSP), however, is not yet fully widespread despite having demonstrated great efficiency, both on a large scale and on a small scale for heating water in industry. One of the main drawbacks to this energy solution is the large size of the facilities. For this purpose, several models have been developed to avoid shadowing between the CSP arrays as much as possible. In this study, the classic shadowing models between the CSP lines are reviewed. Where one of the major challenges is that they are studied geometrically as a fixed installation, while they are moving facilities, as they have a tracking movement of the sun. In this work, a new model is proposed to avoid shadowing by considering the movement of the facilities, depending on their latitude. Secondly, the model is tested to an existing facility as a real case study located in southern Spain. Finally, the model is applied to the main existing installations in the northern hemisphere, thus showing the usefulness of the model for any CSP installation in the world.
Keywords: CSP, CSP arrays, Solar, Shadow, Optimization, Sizing.

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