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The selection of batteries to guarantee the uninterrupted operation of telecommunications centres requires specialized personnel. It is a complex process that impacts on the execution of projects. The present work proposes a function programmed in MATLAB, for the automatic selection of the ideal model of lead-acid battery for backup power supply of communication centers, from catalog data tables. From these data, the logarithmic distribution was identified as the one that characterizes the autonomy time curves as a function of the discharge current. The corresponding regression models were fitted and the resulting equations were used to select the appropriate number and capacity of batteries to support specific loads, in periods of time not specified by the manufacturer. In this way, a tool is achieved that contributes to the training of designers and operators of communication networks. [ABSTRACT FROM AUTHOR]

Solar Photovoltaic Systems (SSFV) are part of the Cuban Government'sdevelopment strategy to diversify the energy matrix by reducing dependence on fossil fuels and introducing environmentally friendly technologies. Its implementation at the residential levelhas been entrusted to the company COPEXTEL. One of the main problems it faces is the current condition of the electrical systems in Cuban residences, most of which do not have grounding or differential protection to protect against leakage currents. Another problem, no less important, is the requirement that the SSFV can be used when there is no connection to the network, which is currently not possible. It is necessary to define the required grounding levels as well as a solution that allows considering an electrical service with high vitality, even when there is no power supply from the conventional electrical grid. [ABSTRACT FROM AUTHOR]

Three-phase asynchronous motors represent between 60% and 75% of world consumption. Their high incidence in the load curves of a country and, consequently, in the operation of electrical systems makes necessary the development of models that allow their analysis in an effective way and their use in software for the analysis of electrical networks. In any industry there are a large number of electrical machines located in Motor Control Centers all connected to the same busbar. It is possible to group all the motors that are connected to the same busbar forming a single equivalent motor. This paper presents a methodology for obtaining the parameters of an aggregate. From its application to three different case studies, the parameters of a universal aggregate model of a three-phase asynchronous motor for power system analysis are obtained. [ABSTRACT FROM AUTHOR]

Ecuador's energy matrix is undergoing changes in its structure with a projection based on distributed generation with renewable enegy sources, from the potential of the territory's. The Guillen's Ravine, in the municipality of Portoviejo at in the province of Manabí, is a territory with irregular terrain and the electrical grids are close to rivers. This situation causes interruptions to the electrical service in the winter, due to breakdowns that affect the territory. The objective of the research is to analyze alternatives to improve the quality of the electric service and, in some cases, to offer energy stability through the introduction of microgrids in a way as isolated systems. The geographic information system and the software CYME 9.2 were used for the modeling and analysis of microgrids. As a result by simulation of photovoltaic systems we obtained that these systems can be incorporated in a distributed generation mode to improve the quality of electricity service to this territory. [ABSTRACT FROM AUTHOR]

Evaluation of frequency behavior errors under disturbance conditions of an electrical power system is essential in order to obtain reliable settings of DAF schemes. Models based in concentrated systems cannot evaluate the influence of local and inter areas oscillations of frequency which are important in the reliable setting of DAF systems. An evaluation of these errors in future Cuban Electric Power System is the main objective of this paper. In this work is taken as a basis for calculating the prospective scenario of the Cuban Power System with the inclusion of two combined cycle and considering the effect of the nonlinear load representing both steelworks arc as randomness of the load due to wind turbines turbulence. It concludes with the values of df / dt measured load nodes and the frequency drop at these nodes are kept lower than the measured values generators nodes. [ABSTRACT FROM AUTHOR]