Design of a multi-level inverter for applications in distributed generation

Abstract

At present, the use of electricity generation systems through alternative sources of energy is continuously increasing, due to the increase in global energy demand, and a trend in which CO2 emissions are being reduced. As a result of these trends, the implementation of these energy sources has increased steadily in the last quarter of a century. For the integration of these alternative forms of electricity generation to be adequate, especially in the use of solar energy and wind energy, because it is necessary to condition them, it has become latent the need to implement electronic power devices such as inverters (continuous current - alternating current), which currently seek to have small, medium and high power sources of electricity, which meet the requirements of efficiency, quality and safety established by the Commission Federal de Electrician (CFE). In the present work, the design and the implementation of a DC/AC converter (direct current - alternating current) using a topology for the inverter of cascaded H - bridges with independent DC sources in a multilevel configuration of 11 voltage levels of control. Applying the technique of the Selective Harmonic Elimination modulation, technique that allows it by Fourier series analysis appropriately chooses the switching angles for the elimination of harmonics of the most significant low frequency.