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Copyright of Ecología Política is the property of Fundacio ENT and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of DYNA - Ingeniería e Industria is the property of Publicaciones Dyna SL and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Conventional power systems are confronted with continuous and gradual advance of renewable power generation. Small photovoltaic power plants are usually integrated into the medium voltage grid through multiple branch lines in branched topologies, making the study of protective measures, an important issue. Avoiding unnecessary trips not only reduces economic losses but also contributes to system's stability. The objective of this work is to study real fault events recorded in solar power plants in Cuba that cause false tripping of the protection devices installed on the primary side of the power plants transformers. Using simulations performed in DIgSILENTPowerFactory, it was shown that when transformers are wye-delta, they become zero current sources, since this is thecondition that causes false tripping. Finally, a new transformer configuration has been applied that allows the correct operation of protection system and a reduction of the feed-in of the photovoltaic systems. [ABSTRACT FROM AUTHOR]

Some mathematical models are developed for a Photovoltaic Solar Park (PSFV) applying different identification techniques, considering the behavior of the solar irradiation and panel temperature as input variables and the generated active power as out put variable. These models will be used to study a behavior and as reference in forecasting systems of generated power predictions in this PSFV, contributing to the decision making concerning the logistics of the national electro-energy system(SEN).The methodology exposed in this work can be used to obtain the model of any PSFV that is of interest. The PSFV models area warded and validated with measurements extracted directly from an industrial PSFV installation. [ABSTRACT FROM AUTHOR]

The article discusses the use of luminescent materials in the design of photovoltaic modules to optimize the coupling between the semiconductor bandgap and solar radiation, which promotes an increase in electricity generation. The concept of a luminescent solar concentrator (LSC) is presented, which consists of a photovoltaic device that integrates solar cells and luminescent particles to guide luminescent radiation towards the solar cells and concentrate it, without the need for a mechanical solar tracking system. It is mentioned that the LSC acts as a photovoltaic concentration system with economic advantages. A comparative study was conducted between two prototypes with the same geometry, one with a luminescent material deposited on the surface and another without it. It was found that the prototype with the luminescent material generated 22% more photocurrent and 14% more electrical power than the control prototype. However, the costs associated with this development still do not allow for an alternative device to polycrystalline silicon solar panels to be offered. It is mentioned that this technology could also benefit electronic device screens. In addition, the different energy losses that occur in an LSC and how they affect its overall efficiency of converting solar radiation into electricity are described. It is mentioned that the initial configuration consisted of embedding a perylene molecule between two glasses with solar cells at the ends. However, alternatives have been proposed to improve performance, such as the design of a multilayer system of luminescent materials or the combination of several luminescent molecules in the polymeric support matrix. It is concluded that luminescent solar concentrators have advantages for being integrated as photovoltaic devices, such as the generation of an additional light source, optical concentration capability, and adaptability to industrial photovoltaic module assembly processes. [Extracted from the article]

The economic development of the country establishes among its priorities, the achievement of the efficient use of energy in the pumping of water, which constitutes one of the fundamental links for Agriculture. In recent years, various solar pumps have been introduced in Cuba in order to economically empower various companies. Its evaluation allows obtaining information for decision-making with a view to its possible introduction into the country for these purposes. This work was developed at the Experimental Station of the Agricultural Engineering Research Institute with the aim of determining the technical and operating characteristics of the photovoltaic system and the Lorentz PS2-150-C- SJ5-8 Solar Pump. The methodology used consisted of measuring the electrical and hydraulic characteristics of the system at the time of its start-up, in addition to calculating the daily volume of water pumping. The results found showed that the average power obtained from the panels was 0,3 kW, the maximum pressure reached by the pump was 20 m.c.a. when the discharge was 1,52 m³/h and the maximum flow rate was 4,00 m³/h in 2 m.c.a. The daily volume of water in 7 hours of pumping was 28,02; 18,20 and 10,64 m³/day for heights of 2, 11 and 20 m.c.a. respectively. It was concluded that the behavior of the evaluated equipment is acceptable with respect to the characteristics provided by the manufacturer. [ABSTRACT FROM AUTHOR]

The use of renewable energy sources has increased exponentially worldwide. Cuba has implemented a program until 2030 where renewable sources play a fundamental role within the national energy matrix. The policy regarding the installation of solar plants has been to connect small plants of up to 5 MW, mainly in distribution networks. In this work an optimization algorithm is developed to identify the best connection points of small solar plants in distribution networks. The algorithm solves the problem through a power flow combined with a full N-P allocation model. The goal of the algorithm is obtaining the best points to connect solar plants in buses of a radial distribution network at to minimize total active power losses or the deviation of voltage profile. [ABSTRACT FROM AUTHOR]

Copyright of Roca: Revista Científico-Educacional de la Provincia de Granma is the property of Universidad de Granma, Departamento Editorial and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Different parameters that affect the territorial planning with photovoltaic systems are valued, the behavior of the solar potential of each municipality is included, highlighting those that meet the best conditions to install a photovoltaic power plant. The economic and environmental impact is evaluated, information on the maximum and minimum potential of each territory is presented, in addition to the behavior of the angle of inclination and the technical performance of the technology, the energy, economic and environmental efficiency in different connection modes is analyzed, the technical elements that must be considered in the project of assembly and installation of the technology are proposed, In addition to the risks to which these facilities are subjected to ensure an adequate efficiency of use of the solar resource, the losses in the processes of distribution and transportation of electricity are assessed, expressing the elements that influence and determine the levels of efficiency in the use of the energy generated. [ABSTRACT FROM AUTHOR]

The horizontal single-axis tracker system (HSAT) moves collectors changing the East-West orientation to track the sun's position during the day. However, as a limitation, it requires a higher area than the fixed tilt system (SAF) for the same power. Recently, HSAT with backtracking (HSAT-B) has been developed to increase the ground cover ratio (GCR). By backtracking, modules move such that no mutual beam shading occurs. As Cuba is a small country with land constraints for construction of new solar farms, the authors compared the HSAR-B with the SAF and. the East-West orientation system (SEO), and concluded that, facing land restrictions and taking into account the specific characteristics of the site, the backtracking is other technology to assess. [ABSTRACT FROM AUTHOR]

In the Northern Hemisphere, fixed tilt systems, as a rule of thumb, face south for energy maximization per power unit. In relatively recent times, some solar parks have been mounted with two-sided orientation East-West in grounds and roofs. Several advantages are obtained: more energy and power per area unit, reduction of shading between panels, greater generation in early and late hours of the day and during the summer, less vulnerability to wind of the structures and better economic results, among others. The authors carry out the simulation with the meteorological data of a site in Cuba. They compared the results with those obtained from simulations with fixed tilt systems and different tilt angles and distance between the beginning of rows, and conclude that with the two-side systems, an increase in annual generation is obtained in the same area, as well as a "smoothing" of the generation curve during the day. [ABSTRACT FROM AUTHOR]

This article presents the results obtained in the replacement of the lighting system of a public office building with more efficient technologies, in addition to the incorporation of a photovoltaic solar park that contributes to generate some of the energy by renewable sources. Its objective is to assess the replacement of the current existing systems in the building that are high consumers of electricity, by efficient technologies in the use of energy to reduce the electricity consumption of the building. For them, theoretical methods such as the analysis and synthesis of the information and the historical-logical, as well as empirical methods such as descriptive statistics, as well as the updated bibliographic and documentary review on energy efficiency in buildings were used. With the proposals to changing technologies, it was demonstrated that it is possible to achieve a reduction in the electricity consumption of the property by 17% compared to current consumption. [ABSTRACT FROM AUTHOR]

Based on the interest that the Cuban state presents to increase the inclusion of renewable energy sources up to 24% in the country's energy matrix, the idea of carrying out this work, which consists of evaluating the feasibility of the production of electricity from solar thermal plants in Cuba. The technologies of the analyzed thermosolar plants are parabolic cylinder, Fresnel and central tower. The analysis variables that were chosen were power purchase agreement (PPA), internal rate of return, net present value, capacity factor, conversion factor and quantity of water used. For this, were selected three localities belonging to the western, central and eastern region. In addition, were analyzed two types of cooling: by air and evaporative. The results show that the cost of kWh ranges between 20 and 38 cents depending on the type of technology and region of analysis. [ABSTRACT FROM AUTHOR]

The article highlights the Arica and Parinacota region in Chile as a hub for the development of solar applications for arid and semi-arid areas. Solar energy projects have been developed in the region, such as photovoltaic plants and solar pumping systems. The Ayllu Solar project has worked with local communities to implement solar applications, such as a solar-powered tomato packing facility and an aquaculture recirculation system. The aim is to position the region as a reference in solar applications and to promote research and training in the use of solar energy. Dr. Lorena Cornejo Ponce, from the Department of Mechanical Engineering at the University of Tarapacá, is the coordinator of the Ayllu Solar Associative Network in Arica, Chile. [Extracted from the article]

Copyright of Economía, Sociedad y Territorio is the property of El Colegio Mexiquense and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Decree Law 5/2022, of May 17th, aims to alleviate the effects of the war conflict in Ukraine and the pandemic crisis in Catalonia. Urgent measures are established to simplify the authorization procedures for renewable energy generation projects, especially those with a power equal to or less than 5 MW. In addition, the requirements for the implementation of photovoltaic solar plants on agricultural and forest land are relaxed. The Decree Law came into effect on May 19th, 2022. [Extracted from the article]

Currently in Chile about 68% of the electricity is generated by thermal power plants, consuming fossil fuels which are approximately 90% imported. The high variations on the price of such resources affect directly the industrial production, and therefore hindering the national development. Nonetheless, Chile presents high availability of renewable energy sources, such as solar and wind, which can represent a viable alternative in achieving the challenges in energy security and climate change mitigation goals. Despite that, the current deployment of renewable energy technologies in Chile is not significant, mainly due to the high risk associated to such projects. The aim of the present work is to assess the contribution of the carbon credits to the competitiveness of concentrating solar power plants. The evaluation is carried out by several simulations using the System Advisor Model software, coupled with the official methodologies from UNFCCC for estimating the emission reduction and considering several scenarios for the composition of the Chilean electricity matrix. Through this analysis it is possible to establish that the risk perception is not justified, since at the particular climatic conditions of northern Chile, can be competitive with other energy sources. In this context, the key variables are the solar irradiation, financing alternatives and tax incentives. However, the carbon credits can also represent a decrease of the Levelized Cost of Energy (LCOE), depending on the evolution of the carbon market. [ABSTRACT FROM AUTHOR]

Expected relevant role, within the new energy paradigm, of photovoltaic (PV) solar energy is based on: First on the rapid advances of research and development in the PV field that have allowed spectacular high efficiencies for light to electricity conversion. Second, on the development of a low cost production industry, mainly in China, for PV cells and PV panels, resulting in a premature achievement of a mythical milestone: the grid parity (solar kWh/ grid kWh cost ratio). Arguments against viability ofPV technology are now obsolete, opening the door for its large scale implementation, particularly at emergent economy countries. [ABSTRACT FROM AUTHOR]

Copyright of Visión Electrónica is the property of Fondo de Universidad Distrital Francisco Jose de Caldas and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The FOTOCAL automated system performs the calculation of the dimensions and the electricity generation of the photovoltaic module that it is needed for the energy demand according to outlined situation; it also establishes the price of the required technology. With the results of this software, it is possible to establish the economic resources for the installation of this technological proposal. This program has been used for the determination of the sun photovoltaic energy potential of agricultural facilities, projects of scientific research, thesis for the obtaining of the title of mechanized system engineering, master and diploma work. [ABSTRACT FROM AUTHOR]

This paper presents an analysis of the sigma-delta conversion applied to the control of the DC link resonant inverters. This inverter configuration is often employed as a part of photovoltaic system because it presents the advantage that the semiconductors elements commute at zero tension or zero current. It happen on the high frequency elements and the inverter elements, and it is not necessary to modulate the DC tension, condition that simplified the control loop. Conversion analog-digital is an important step of the almost every modern electronics systems. After the signal is translated to the digital format, it can be processed easily in order to obtain the required information. [ABSTRACT FROM AUTHOR]