Special Issue "Electrical Power Engineering: Efficiency and Control Strategies"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Sustainable Energy".

Deadline for manuscript submissions: 30 April 2022.

Special Issue Editors

Dr. Francisco Javier Ruiz-Rodríguez
E-Mail Website
Guest Editor
Department of Electrical and Thermal Engineering. Higher Technical School of Engineering, University of Huelva, Avda. Fuerzas Armadas, s/n, 21007 Huelva, Spain
Interests: power system analysis; renewable energy; distributed generation; power quality; power electronics; electric vehicles
Dr. J. C. Hernandez
E-Mail Website
Guest Editor
Electrical Engineering Department, University of Jaen, Campus Las Lagunillas, s/n, Jaen 23071, Spain
Interests: power electronics; renewable systems; microgrids; electric vehicles; power quality; power systems simulation; metaheuristic optimization
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Special Issue Information

Dear Colleagues,

Nowadays, it is a fact that we are moving towards a sustainable global energy system model, to try to curb climate change. In this sense, the generation of electricity and the transport sector play an important role. The energy transition towards a model of electricity generation based on renewable energies and the progressive introduction of the electric vehicle is necessary. Both the transition to renewable systems and introduction of electric vehicles will affect the behavior of electrical systems. Then, it will be necessary to carry out an in-depth study of the impact that these will produce in the electrical systems.

The topics to be addressed in the Special Issue include but are not limited to the following:

  • Power flow control and optimization algorithms;
  • Electrical energy efficiency in industry, buildings, transmission and distribution, etc;
  • Modeling, simulation, and control of power electronic converters;
  • Analysis of the uncertainty generated by renewable sources and electric vehicles;
  • High-/medium-voltage DC systems;
  • Grid planning with large-scale renewable energy resources;
  • Renewable energy conversion systems: design, modelling, control, and integration of modern power systems;
  • Power and energy quality in electric systems.
Dr. Francisco Javier Ruiz-Rodríguez
Dr. Jesús C. Hernandez
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. 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 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

  • Voltage control
  • Microgrid and smart grid
  • Renewable energy sources
  • Electric vehicles
  • Photovoltaics
  • Wind power
  • Metaheuristics
  • Power electronics
  • Power quality
  • Electric systems
  • Uncertainly
  • MVDC system
  • Energy efficiency

Published Papers (4 papers)

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Research

Article
Operating Cost Reduction in Distribution Networks Based on the Optimal Phase-Swapping including the Costs of the Working Groups and Energy Losses
Energies 2021, 14(15), 4535; https://doi.org/10.3390/en14154535 - 27 Jul 2021
Viewed by 285
Abstract
The problem of optimal phase-balancing in three-phase asymmetric distribution networks is addressed in this research from the point of view of combinatorial optimization using a master–slave optimization approach. The master stage employs an improved sine cosine algorithm (ISCA), which is entrusted with determining [...] Read more.
The problem of optimal phase-balancing in three-phase asymmetric distribution networks is addressed in this research from the point of view of combinatorial optimization using a master–slave optimization approach. The master stage employs an improved sine cosine algorithm (ISCA), which is entrusted with determining the load reconfiguration at each node. The slave stage evaluates the energy losses for each set of load connections provided by the master stage by implementing the triangular-based power flow method. The mathematical model that was solved using the ISCA is designed to minimize the annual operating costs of the three-phase network. These costs include the annual costs of the energy losses, considering daily active and reactive power curves, as well as the costs of the working groups tasked with the implementation of the phase-balancing plan at each node. The peak load scenario was evaluated for a 15-bus test system to demonstrate the effectiveness of the proposed ISCA in reducing the power loss (18.66%) compared with optimization methods such as genetic algorithm (18.64%), the classical sine cosine algorithm (18.42%), black-hole optimizer (18.38%), and vortex search algorithm (18.59%). The IEEE 37-bus system was employed to determine the annual total costs of the network before and after implementing the phase-balancing plan provided by the proposed ISCA. The annual operative costs were reduced by about 13% with respect to the benchmark case, with investments between USD 2100 and USD 2200 in phase-balancing activities developed by the working groups. In addition, the positive effects of implementing the phase-balancing plan were evidenced in the voltage performance of the IEEE 37-bus system by improving the voltage regulation with a maximum of 4% in the whole network from an initial regulation of 6.30%. All numerical validations were performed in the MATLAB programming environment. Full article
(This article belongs to the Special Issue Electrical Power Engineering: Efficiency and Control Strategies)
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Article
On the Applicability of Two Families of Cubic Techniques for Power Flow Analysis
Energies 2021, 14(14), 4108; https://doi.org/10.3390/en14144108 - 07 Jul 2021
Viewed by 225
Abstract
This work presents a comprehensive analysis of two cubic techniques for Power Flow (PF) studies. In this regard, the families of Weerakoon-like and Darvishi-like techniques are considered. Several theoretical findings are presented and posteriorly confirmed by multiple numerical results. Based on the obtained [...] Read more.
This work presents a comprehensive analysis of two cubic techniques for Power Flow (PF) studies. In this regard, the families of Weerakoon-like and Darvishi-like techniques are considered. Several theoretical findings are presented and posteriorly confirmed by multiple numerical results. Based on the obtained results, the Weerakoon’s technique is considered more reliable than the Newton-Raphson and Darvishi’s methods. As counterpart, it presents a high computational burden. Regarding this point, the Darvishi’s technique has turned out to be quite efficient and fully competitive with the Newton’s scheme. Full article
(This article belongs to the Special Issue Electrical Power Engineering: Efficiency and Control Strategies)
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Article
Grid-Connected PV Systems Controlled by Sliding via Wireless Communication
Energies 2021, 14(7), 1931; https://doi.org/10.3390/en14071931 - 31 Mar 2021
Viewed by 415
Abstract
Grid-connected photovoltaic (PV) systems are designed to provide energy to the grid. This energy transfer must fulfil some requirements such as system stability, power quality and reliability. Thus, the aim of this work is to design and control a grid-connected PV system via [...] Read more.
Grid-connected photovoltaic (PV) systems are designed to provide energy to the grid. This energy transfer must fulfil some requirements such as system stability, power quality and reliability. Thus, the aim of this work is to design and control a grid-connected PV system via wireless to guarantee the correct operation of the system. It is crucial to monitor and supervise the system to control and/or detect faults in real time and in a remote way. To do that, the DC/DC converter and the DC/AC converter of the grid-connected PV system are controlled wirelessly, reducing costs in cabling installations. The used control methods are the sliding for the DC/DC converter and the Proportional-Integral (PI) for the inverter. The sliding control is robust, ensures system stability under perturbations, and is proven to work well via wireless. The PI control is simple and effective, proving its validity through wireless too. In addition, the effect of the communications is analysed in both controllers. An experimental platform has been built to conduct the experiments to verify the operation of the grid-connected PV system remotely. The results show that the system operates well, achieving the desired values for the maximum power point tracker (MPPT) sliding control and the energy transfer from the inverter to the grid. Full article
(This article belongs to the Special Issue Electrical Power Engineering: Efficiency and Control Strategies)
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Article
Robust Control of Shunt Active Power Filters: A Dynamical Model-Based Approach with Verified Controllability
Energies 2020, 13(23), 6253; https://doi.org/10.3390/en13236253 - 27 Nov 2020
Cited by 1 | Viewed by 472
Abstract
This paper presents the robust control of Three-Leg Split-Capacitor Shunt Active Power Filters (TLSC SAPFs) by means of structured H controllers for reactive, unbalanced, and harmonic compensation and the DC-link bus voltage regulation. Robust controller synthesis is performed based on the TLSC [...] Read more.
This paper presents the robust control of Three-Leg Split-Capacitor Shunt Active Power Filters (TLSC SAPFs) by means of structured H controllers for reactive, unbalanced, and harmonic compensation and the DC-link bus voltage regulation. Robust controller synthesis is performed based on the TLSC SAPF dynamical model including power losses in passive elements. Before the control implementation, a systematic procedure for the nonlinear controllability verification of the converter and its quantification using the set-theoretic approach is presented. Controllability verification serves to accurately design the SAPF’s operation region. Thus, a Voltage Oriented Control (VOC) structure is implemented by using two different approaches to determine the PI controller parameters: (1) the traditional Pole-Placement method (PP-PI) and (2) the H-PI structured synthesis approach, which leads to PI robust controllers. From the latter approach, two sets of parameters are obtained. The first set considers the nominal model (H-PI), and the second one explicitly accounts for the model parametric uncertainties (H-uPI). An optimization procedure is presented for obtaining the optimal H-PI and H-uPI controller parameters where four complementary constrains are defined to establish a trade-off between the controllers performance and robustness. The enforcement of constraints is later evaluated for each of three PI controllers obtained. This work aims to establish a common ground for the comparison of robust control strategies applied to TLSC APFs; therefore, the TLSC SAPF compensation performance is measured and compared with the performance indices: integral of the absolute error (IAE), integral of the time-weighted absolute error (ITAE), integral of the absolute control action (IUA), and maximum sensitivity (Ms). Full article
(This article belongs to the Special Issue Electrical Power Engineering: Efficiency and Control Strategies)
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