Conversores monofásico-trifásicos com otimização de perdas, tolerância à falha e comparação multicritério.

Abstract

This research provide low cost and investment solutions for a problem present in rural areas, use three-phase loads where have only single-phase source availability . The concessionaires of electric power distribution use low investment systems in rural areas because of its low density of consumers. Single-phase systems of power distribution, or phase-neutral SWER (Single Wire Earth Return) systems, are widely used in rural areas in Brazil and others countries. Moreover, three-phase loads have a number of advantages over single-phase loads, available in a wide range of power, cheaper, lower cost maintenance, more robust, less noise, among others. This research focuses on the study of converters such as VSI (Voltage Source Inverter) with only one capacitor in the DC link. Two converters of low operating cost are proposed, one of ten switches and another of eight switches. These converters take advantage of the con guration of universal active lters to increase e ciency. Steady state analysis are performed to determine characteristics of minimum DC link voltage, arm current and IGBTs dual module losses. These characteristics determine the operating points more attractive. Results of dynamic simulations and experiments are performed. The proposed converters have more uniform IGBT module losses that the converters in series. This feature improves their reliability. Multicriteria comparison is made with the converters already published in literature. Tools are proposed for quick estimation of IGBT module losses and reliability of the synchronized converters. An application of fail tolerance for a converter of ten switches is performed in order to propose a con guration for a scenario where the unplanned shutdown of the converter has high cost.