Propostas de controles por busca extremal com modulação por largura de pulso aplicados em sistemas fotovoltaicos

Abstract

Extremum-seeking controllers are widely used in the literature due to their simple implementation without needing prior information from the control direction. One application of these controllers consists of dynamically adjusting the MPPT (Maximum PowerPoint Tracking) converters coupled to the solar panels to extract their maximum power. Essentially, these controllers operate with switching frequencies that, ideally, should tend to infinity t o mitigate t he e ffect of de lay. Ho wever, ap plications involving MPPT converters have restrictions on the switching frequency, even with advances in silicon carbide-based semiconductor technology. Thus, in this dissertation, the use of two extreme search techniques with pulse width modulation (PWM - Pulse Width Modulation) was explored. Combining these extreme search techniques with PWM resulted in the main contributions, as presented through simulation results for on-grid and off-grid photovoltaic systems with the proposed controllers.