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The existing combined regulation methods do not lead to efficient management of water in isolated hydraulic turbines; these do not prioritize the minimization of the value of the resistive dump load. In this paper, a frequency regulation scheme was proposed that combines a minimum dump resistive load and the flow of the Pelton turbines that operate autonomously. At the begining on this paper was identified the state of the art of autonomous isolated hydro. Also was charactererized in cuban contect and the posibilities of dump load and flow cntrolls methods. Finally was evauated the combination of this two methods due to a generalized cuban study case. The simulation results of the method in Matlab®/Simulink was processed through a case study, from models obtained in previous investigations, contrasted with benchmark reported in the literature. With this scheme it was possible to increase the energy efficiency of autonomous mini-hydroelectric plants. Through simulation the proposed scheme was validated in a way that complies with Cuban standard NC62-04, with a reduction of the resistive dump load at 6% of the generator nominal power value. [ABSTRACT FROM AUTHOR]

The circular economy (CE) model promotes the production of goods and services in a sustainable way, optimizing the consumption of natural resources and mitigating the wastes. In the last years, this model has received a lot of attention and support at the governments' level, internationally; also, in Latin America. Cuba pleads for a sustainable development, with political and incentives for the recycling, the use of the renewable sources and the energy efficiency, as impeller motor of its economic model. Hence, Cuban universities have been requested to include this topic in their study plans, for all the careers. The objective of this paper is to describe how the topic of Circular Economy has been incorporated in the Study Plan of the Electrical Engineering Career at the Technological University of Havana "José A. Echeverría "CUJAE and the results, during the implementation in the 2021 academic year. [ABSTRACT FROM AUTHOR]

This paper approaches the issue of the partial introduction of electric vehicles in the public transport sector, analyzing the possible reduction of environmental pollution and fossil fuel consumption by replacing part of the real fleet as the main aim. Starting from the previous analyzes and the characterization of the vehicles fleet belonging to the company, a substitution is proposed based on the changes that would be made in the associated electrical system, as well as the electric vehicle technology itself through the technical, economic and environmental evaluation, taking into account two prototypes that are currently working. The results of the research show the benefits of replacing internal combustion cars with electric ones, based on the savings obtained in operation and maintenance, as well as the reduction of greenhouse emissions. [ABSTRACT FROM AUTHOR]

Today, the development of human life depends on the supply of energy obtained mainly from fossil fuels. This resource is limited and its availability finite. Solar energy can meet the needs of the global population. Concentrated solar energy uses a mirrored surfaces that reflects and concentrates the rays in a receiver that absorbs the solar energy transferring it as heat to the fluid that circulates inside it and that can be used in processes that need thermal energy. The efficiency of the system depends on the optical quality of the concentrating mirror. In this paper, the optical efficiency(ηop) of a prototype parabolic disk is determined using a calorimeter, which acts as a receiver, being the value ηop=0,71±0,02. The method is validated by applying a modified Hartmann's optical scanning test, the values wereηop=0,70±0,02 for the of intercept factor method and ηop=0,69±0,02 for the optical simulation. [ABSTRACT FROM AUTHOR]

In this paper we designed and implemented a process for considering energy planning requirements of the NC-ISO 50001: 2011 ¨Energy Management¨. The premise was to design requirements of international standards related to energy management ISO 50001: 2011, UNE 216301: 2007, DIN EN 16001, ANSI / MSE 2000: 2008 and quality management ISO 9001: 2008. For application was selected as a case study Hydraulics Company Cienfuegos, using tools and techniques such as: working with experts, review of documents, tools Total Technology Management Energy Efficient and quality, obtaining as results the energy planning, through the determination of the structure of energy consumption, significant consumption areas, which led to establish base line and energy goal of the organization. [ABSTRACT FROM AUTHOR]

The energy efficiency of an electric system depends in great measure of the reactive power compensation that it is carried out. One of the roads more employees are the use of capacitors banks. A good selection of these, presupposes three aspects: the selection of the banks capacity, the compensator type to use, as well as the location in the low voltage system. References of methods that consider the three aspects in a same problem are based on the mathematical programming, but these cannot represent all the effects of the compensation and these based in technical of continuous programming, being this a complex optimization problem of discreet search space. In the paper, we have developed a method with the employment of the genetic algorithms, which facilitates a more exact problem formulation. The method has been programmed in MATLAB, version 7.5 (R2007b), using programming structures of Genetic Algorithm and Direct Search Toolbox.The effectiveness is shown in an example of real application to the low voltage system of a hotel installation of the Cubanacan Company in Camagüey. [ABSTRACT FROM AUTHOR]

This paper exposes the lighting study results and energy impact evaluation of the 40 more important public roads in the urban center of Santiago de Cuba city . The causes and consequences of the problem are identified. It is demonstrated that these facilities, in spite of possessing a not very significant electric demand, presents an appreciable electric power consumption that incentivates to be designed and exploded from appropriate politics for it achieves the biggest energy efficiency during all their cycle of life. The outlined solutions allow to save 792,15 MWh per year that which means a reduction of 67,7 % regarding the current consumption. [ABSTRACT FROM AUTHOR]

In the paper, the productive flow existing in the nickel producer enterprise Commandant Ernesto Guevara was described until the stage of dry milling, with an emphasis on the technical details of greater relevancy in the process. There was analyzed the influence of the amount of mineral in the system over the energy consumption performance of the milling. Finally it were identified the technological requirements imposed by the 215 - TR - 201 laterite carrier to the electric drive, according to the characteristics and needs of the process. [ABSTRACT FROM AUTHOR]

In this article, we performed a detailed analysis on the environmental pollution caused by the consumption of fossil fuels in the production of electricity, which has prompted a revaluation of the global use of renewable energy. The production of electricity from renewable sources depends on many factors. This paper is a study on the problems associated with traditional energy sources with fossil fuels, emphasizing on the danger of indiscriminate use of these energy resources. Also is studied the use of non-conventional sources of energy as an alternative to lessen the energy crisis that is looming for the middle of this century. [ABSTRACT FROM AUTHOR]

One of the most difficult variables to define when a distribution network study is carried out is, undoubtedly, the loads behavior, among them, are the home loads, which are integrated by low demand appliances (electronic devices, efficient lighting, etc.) and by high power equipments such as the ones used for cocking; of course, these are the most important in the load curve. The use of the electric energy for home cocking and basically because it is used in a well defined time interval has impacted hardly in the electric demand, the energy consumption, the power factor and the daily curves. In this paper are presented both, the method used to determine the characteristics of the new load curves and their results. [ABSTRACT FROM AUTHOR]