Análise eletroenergética de geração solar fotovoltaica distribuída em São Tomé e Príncipe.

Abstract

This work presents an analysis of the insertion of distributed solar photovoltaic generation in the National Electrical System of São Tomé and Príncipe. The study evaluates technical and economic aspects of viability using computational tools for this. The PVsyst software is used in the technical feasibility analysis of a 1MWp photovoltaic mini-generation system, based on the performance coefficient PR. The projected system has a nominal capacity to supply 882kW with a performance ratio of 80.47 %. In the economic viability analysis, the photovoltaic mini-generation system presented a 12-year return on investment, a calculated IRR equal to 6 % and, being greater than the defined value of MARR, the investment was considered economically viable. The simplified analysis of the aggregation of multiple sources of harmonic current, evaluates the insertion of three mini-generation systems to the existing network. The modeling and simulation is related to the MATLAB/ Simulink package, returning the THD values and individual distortions, in addition to the results of the sum methods. In the simulation, the individual distortion values are similar to the values of the arithmetic method, except for the SE1 bus current, which presents an unexpected cancellation of harmonic orders 5 and 7. The economic feasibility analysis of distributed photovoltaic microgeneration systems is performed using HOMER Pro software, with the country’s energy tariffs as sensitivity variables. The results of this analysis show that the acquisition of photovoltaic systems is not feasible only for residential consumers with a tariff equal to 0.08US$/kWh. The viability of distributed microgeneration systems presents itself as an opportunity to reduce costs with thermal generation, bringing socioeconomic development to the country.