Controle preditivo baseado em modelo aplicado ao inversor multinível com aterramento comum para sistemas de geração solar fotovoltaica

Abstract

The expansion of distributed generation using solar photovoltaic systems motivated the development of several topologies and control strategies aiming at the proper operation of these systems. The transformerless inverter is one of the most used topologies in low power generation, presenting excellent characteristics, such as: reduced weight/volume, high efficiency and low cost. However, such inverters have problems with leakage currents, which according to regulations must be limited to prevent safety problems and damage to the installation or personnel. Several non-isolated converter topologies have been proposed to reduce leakage currents in photovoltaic systems. This work aims to discuss the characteristics of a specific topology of inverters intended to solve the problem of leakage currents in grid-connected solar photovoltaic systems.In addition, two model predictive control strategies for this topology will be presented. The analyzes carried out will focus on studying the transient and steady-state behavior. With that, will be verified characteristics of DC voltage error in the capacitors and total harmonic distortion for the output current. Key words: Solar Photovoltaic Generation; Transformerless Inverters; Gommon Grouded Inverter; Model Predictive Control.