Alfredo Alcayde

University of Almería | UAL · Department of Engineering

Traditional methods for current compensation in power systems and electrical circuits have heavily relied on ad hoc defined power concepts. This paper introduces a novel, power-free approach to both active and passive current compensation based on vector projection and rejection principles. The proposed method leverages vector geometric algebra as...

This study introduces a novel approach to enhancing energy efficiency by building a high-resolution dataset for Non-Intrusive Load Monitoring, addressing the challenges of monitoring a wide range of devices. To achieve optimal energy efficiency, it is essential to have advanced monitoring of electrical variables. In this context, the second version...

This work introduces a novel approach in power quality analysis by fitting three-phase voltage curves with ellipses using Geometric Algebra for Conics (GAC). Recognizing the limitations of current linear algebra-based methods, this paper highlights the need for further exploration into more effective techniques. Geometric Algebra offers a potent, e...

The growing urgency for sustainable energy solutions necessitates a deeper understanding of the environmental impacts of renewable technologies. This article aims to synthesize and analyze Life Cycle Assessments (LCA) in this domain, providing a comprehensive perspective. We systematically categorized 2923 articles into four sectors: (1) photovolta...

The growing need of the global society to harness renewable resources has resulted in a heightened curiosity to adopt innovative technologies in novel settings. An illustration of this phenomenon can be seen in offshore floating solar power facilities (FPV). As of August 2020, cumulative installed floating solar PV capacity was over 2 GW in 338 act...

The objective of this work is to determine the CAPEX and OPEX of a floating offshore photovoltaic farm. The case of study will analyse a particular floating offshore photovoltaic platform called Merganser and a possible location in the Mediterranean area of the Iberian Peninsula. Results will denote the best areas where this type of energy can be i...

This study introduces a novel approach to enhancing energy efficiency by building a high-resolution dataset for Non-Intrusive Load Monitoring, addressing the challenges of monitoring a wide range of devices. To achieve optimal energy efficiency, it is essential to have advanced monitoring of electrical variables. In this context, the second version...

Background Unlike Transposable Elements (TEs) and gene/genome duplication, the role of the so-called nuclear plastid DNA sequences (NUPTs) in shaping the evolution of genome architecture and function remains poorly studied. We investigate here the functional and evolutionary fate of NUPTs in the orphan crop Moringa oleifera (moringa), featured by t...

The growing urgency for sustainable energy solutions necessitates a deeper understanding of the environmental impacts of renewable technologies. This article aims to synthesize and analyze Life Cycle Assessments (LCA) in this domain, providing a comprehensive perspective. We systematically categorize 2,923 articles into four communities: (1) Photov...

Microgrids are local energy production and distribution networks that can operate independently when disconnected from the main power grid thanks to the integration of power generation systems, energy storage units and intelligent control systems. However, despite their advantages, the optimal energy management of real microgrids remains a subject...

Background: Unlike Transposable Elements (TEs) and gene/genome duplication, the role of the so-called nuclear plastid DNA sequences (NUPTs) in shaping the evolution of genome architecture and function remains poorly studied. We investigate here the functional and evolutionary fate of NUPTs in the orphan crop Moringa oleifera (moringa), featured by...

This article aims to identify core research directions and provide a comprehensive overview of major advancements in the field of hypercomplex signal and image processing techniques using network graph theory. The methodology employs community detection algorithms on research networks to uncover relationships among researchers and topic fields in t...

This paper aims to identify core research directions and provide a comprehensive overview of major advancements in the field of hypercomplex signal and image processing techniques using network graph theory. The methodology employs community detection algorithms on research networks to uncover relationships among researchers and topic fields in the...

Background Beyond the massive amounts of DNA and genes transferred from the protoorganelle genome to the nucleus during the endosymbiotic event that gave rise to the plastids, stretches of plastid DNA of varying size are still being copied and relocated to the nuclear genome in a process that is ongoing and does not result in the concomitant shrink...

This review underscores the escalating global research trend in this field since 2000. The primary scientific disciplines contributing to extensive research on smart water meters are engineering, computer science, and energy. In terms of countries, the analysis reveals that the United States, India, and China exhibit the highest scientific producti...

In the context of the global energy sector’s increasing reliance on fossil fuels and escalating environmental concerns, there is an urgent need for advancements in energy monitoring and optimization. Addressing this challenge, the present study introduces the Open Multi Power Meter, a novel open hardware solution designed for efficient and precise...

Microgrids are a critical component of smart and sustainable cities as they provide localized power generation and distribution that can be optimized for efficiency, cost, and environmental impact. Further, many microgrids are characterized for the presence of smart homes, which are an integral part of smart cities as they play a crucial role in im...

The optimisation of energy consumption requires a reasonably accurate measurement, so an appropriate and advanced monitoring system of the relevant electrical variables in the electrical installations is of paramount importance. In this context, interoperable and highly configurable devices play a crucial role. A clear example is the OpenZMeter (OZ...

The objective of this work has been to analyze the variation of different economic parameters (Levelized Cost Of Energy and Internal Rate of Return) for two possible ways of manufacturing: production by project to mass production. For this, 6 possible scenarios have been considered, taking into account the number of equipment manufactured and the e...

Due to the proliferation of renewable energy systems, the study of voltage and frequency stability is a crucial aspect. Recently, this problem has been approached from a purely geometrical point of view with interesting results. The present work investigates the properties of the so-called electrical curves described by arbitrary voltage or current...

The objective of this work is to create a tool that serves to know the possibilities of manufacturing, storage, assembly, and maintenance of floating marine structures trying to take advantage of the ports and shipyards of Spain. This would help reduce costs and could make this type of energy more profitable. To this end, all the Spanish ports and...

The optimisation of energy consumption requires a reasonably accurate measurement, so an appropriate and advanced monitoring system of the relevant electrical variables in the electrical installations is of paramount importance. In this context, interoperable and highly configurable devices play a crucial role. A clear example is the OpenZMeter (OZ...

Electrical analogues of linear mechanical systems have traditionally been obtained using a set of rules that can potentially be tedious when applied to complex systems. In addition, such rules do not cover all the possibilities of mechanical systems including rotational and translational generalized coordinates. The present work establishes a compr...

Beyond the massive amounts of DNA and genes transferred from the protoorganelle genome to the nucleus during the endosymbiotic event that gave rise to the plastids, stretches of plastid DNA of varying size are still being copied and relocated to the nuclear genome in a process that is ongoing and does not result in the concomitant shrinking of the...

This paper investigates the concept of frequency in arbitrary multi-phase systems based on geometrical principles. The proposed approach relies on state-of-the-art mathematical techniques such as differential geometry and geometric algebra in n dimensions. By analyzing the generalized Frénet-Serret frame, we derive how the Darboux bivector can accu...

This paper investigates the concept of frequency in arbitrary multi-phase systems based on geometrical principles. The proposed approach relies on state-of-the-art mathematical techniques such as differential geometry and geometric algebra in $\bm{n}$ dimensions. By analyzing the generalized Frénet-Serret frame, we derive how the Darboux bivector c...

p>This research paper presents a new approach to power definitions in multiphase AC systems in the frequency domain from a purely geometric approach. The theoretical foundation is based on Geometric Algebra (GA) framework, which enables the representation of harmonic voltages and currents as multidimensional vectors in Euclidean space. The use of t...

The paper proposes a new geometric approach to power definitions in multiphase AC systems using Geometric Algebra (GA) framework. This allows harmonic voltages and currents to be represented as multidimensional vectors in Euclidean space, and the use of the geometric product allows the computation of the geometric power multivector. The proposed me...

p>This research paper presents a new approach to power definitions in multiphase AC systems in the frequency domain from a purely geometric approach. The theoretical foundation is based on Geometric Algebra (GA) framework, which enables the representation of harmonic voltages and currents as multidimensional vectors in Euclidean space. The use of t...

The objective of this chapter is to have a global perspective of the research related to renewable energy predictions and thus determine the worldwide research trends in this field. For this purpose, all the publications indexed in the Scopus database with these terms in the title, abstract or keywords were studied, obtaining more than 10,000 recor...

This study proposes an explanation for the physical power flow in planar circuits by analogy to theoretical two-dimensional circuits using a new mathematical model based on Geometric Algebra (GA) and 2D Maxwell’s equations. In contrast with traditional 3D physics in the observable real world, the magnetic field can be defined as a bivector instead...

Electrical analogues of linear mechanical systems have traditionally been obtained using a set of rules that can potentially be tedious when applied to complex systems. In addition, such rules do not cover all the possibilities of mechanical systems including rotational and translational generalized coordinates. The present work establishes a compr...

Renewable energy sources are increasingly being integrated into small-scale production systems, so plants with multiple supply sources are becoming more common. This improvement in technology added to a greater social awareness of energy saving and resource usage, which makes flexible systems to manage these facilities necessary. Modern energy mana...

The traditional power grid is evolving into a new smart grid that requires better coordination of supply and demand, making it necessary to establish precise monitoring strategies in order to determine grid status in real-time. With the aim of providing a low-cost device based on open-hardware and open-source software to the technicians, engineers,...

Energy meters provide valuable information that can be used to determine important features such as energy consumption of electrical devices and consumption habits in corporate, residential or public institutions. This information is crucial to establish energy saving strategies. With this aim, different approaches have been proposed in the literat...

This paper describes the characteristics of worldwide scientific contributions to the field of electric vehicles (EVs) from 1955 to 2021. For this purpose, a search within the Scopus database was conducted using “Electric Vehicle” as the keyword. As a result, 50,195 documents were obtained through analytical and bibliometric techniques and classifi...

In a world in which electricity is increasingly necessary, it is vitally important to ensure that the supply of this electricity is safe, reliable, sustainable, and environmentally friendly, reducing CO2 emissions into the atmosphere and the use of fossil fuels [...]

This paper presents a combination of two methods that can be effectively combined for the control of electrical machines. The first method enables real-time identification of electrical and mechanical parameters based on differential geometry and geometric algebra. The second method enables robust control of electrical machines, even when the knowl...

One of the main industries in Spain and other Mediterranean countries are oil mills. Although the specific energy consumption of oil mills depends on the capacity and other characteristics, some studies have highlighted the high energy consumption of these industries. In the case of olive mills, previous studies have shown that energy consumption i...

This Special Issue has focused on symmetry in renewable energy and energy systems II—including wind energy and fluid power [...]

The importance of the quality and continuity of electricity supply is increasingly evident given the dependence of the world economy on its daily and instantaneous operation. In turn, the network is made up of power transmission lines. This study has been carried out based on the Scopus database, where all the publications, over 5000 documents, rel...

The need for electrical energy saving policies is becoming increasingly important nowadays, especially after the latest electricity market tensions in Europe. The energy consumption impacts directly on our electricity bills, thus optimization strategies are required to decrease its negative consequences on the economy and encouraging the consumptio...

Mankind has known about different parasitic diseases since ancient times. There is no doubt that parasites are the infectious agents that have caused the most deaths throughout history. But even today, parasitic diseases affect more than one billion people worldwide. In this paper, the relationship between articles published in the area of parasito...

In this paper, power flows in electrical circuits are modelled in a mixed time-frequency domain by using geometric algebra and the Hilbert transform for the first time. The use of this mathematical framework overcomes some of the limitations of some of the existing methodologies, in which the so-called “active current” may not lead to the lowest Ro...

The stability of the power grid's frequency is crucial for industrial, commercial, and domestic applications. The standard frequency in Europe's grid is 50 Hz and it must be as stable as possible; therefore, reliable measurement is essential to ensure that the frequency is within the limits defined in the standard EN 50160:2010. In this article, a...

It is a fact that the world's population has increased twofold in the last 50 years, which has meant that the availability of freshwater for all required activities, industrial use, agriculture, and domestic use, has become increasingly scarce. In addition to these factors, 40% of the world's population lives less than 100 km from the coast. All th...

This paper proposes a systematic method for the identification of the load circuit parameters (say the R, L, and C elements) based only on the information of the instantaneous voltage and current measured at the point of common coupling (pcc). Geometric Algebra (GA) and concepts of differential geometry are used to produce a rigorous mathematical f...

Feature Selection (FS) is a contemporary challenge for the scientific community since new methods are being discovered and new forms of algorithmic design are required. In this sense, classic bio-inspired swarm intelligence algorithms can be explored to get a new suitable feature selection application where simple agents interact locally with each...

Sustainability is becoming of vital importance in project management, and a life cycle assessment (LCA) can ensure a body of knowledge to bear in mind the environmental burdens the project involves. In this study, two different ways of supplying energy to a sensor network are analyzed. Firstly, we analyze the environmental impact of the devices con...