Análise comparativa entre as técnicas de modulação spwm e svm a partir de sistema fotovoltaico conectado à rede elétrica através de dois estágios com aplicação de filtro ativo

Abstract

This work presents a comparative analysis between two modulation techniques, Sinusoidal Pulse Width Modulation (SPWM) and Space Vector Modulation (SVM), applied to three-phase inverter in a grid-connected photovoltaic system composed oj two stages. The photovoltaic system with a power of 9,375 Wp in configured with three parallel strings, each consisting of Twenty five solar modules in series. In order to perform a comprehensive analysis, various scenarios were simulated, varying solar irration and ambient temperature. Furthermore, the performance of the modulation techniques was evaluated in each scenario. A non-linar load was connected to the grid, causing harmonic distortions. To reduce these distortions, an active filter is used to improve the quality of the energy supplied to the grid. Furthermore, the modulation tecniques are evaluated for their ability to attenuate harmonic components in the eletrical grid currents. The comparative analysis considered several parameters, such as system efficiency, total harmonic distortion for current, and the active filter performance. For all scenarios analyzed, SVM modulation showed better performance compared to SPWM, leading to a redution od 0,86% in THD for the eletrical grid current without the active filter enabled and a redution of 0,80% with the use of the filter. The application of the active filter with SVM modulation resulted in a reduction of 15,16% in THD for the electrical grid current.