Viabilidade de sistema fotovoltaico conectado à rede elétrica para irrigação com pivô central

Abstract

The electricity plays an indispensable role for human development. The demand for electrical energy in Brazil has grown at a rate of 3,2% per year. To supply this need, it will be necessary to invest in alternative sources of energy to compose the electrical matrix. In this scenario, the photovoltaic systems appear as an alternative to compose the country´s electrical matrix, being necessary the study of its different configurations and sizing methodologies and validated research instruments for such task. This work, therefore, had as purpose to evaluate the economic feasibility a photovoltaic system, as an alternative source of electricity in rural areas for irrigation by central pivot. The study of case occurred in Duas Barras farm located in the city of Iraí de Minas – MG. From the survey of energy consumption of a central pivot installed in the property, a photovoltaic system connected to the grid was designed and a financial analysis applied with indicators of internal rate of return, Payback period and net present value at a minimum attractiveness rate of 10% per year. The results have evidenced the unfeasibility of the photovoltaic system, with recovery period of investment, payback, of twenty years. The low cost of electrical prices in rural areas and especially for nocturnal irrigations, makes the photovoltaic system connected to the grid economically unattractive.