Estudo de técnicas anti-ilhamento ativas e passivas com foco na redução da zona de não detecção

Abstract

Nowadays, new technologies for power generation have been evaluated and developed, which the most prominent are the distributed generation, where the generating power units are installed at the points of consumption of the distribution system, with photovoltaic systems being one of the most widespread of them. Due to its acceptance and fast growth, new challenges have arisen in order to maintain the electric power’s quality, with emphasis on the islanding phenomenon, where part of the electric power system remains in operation, despite its disconnection from the main power source. Thus, for the distributed generating plants to guarantee human and devices connected to the electrical network’s security, the inverter must have, according to the law, an anti-islanding function in order to disconnect itself from the electric power system in case of islanding. Therefore, this work analyzes this function, also called anti-islanding technique, distributed in two categories, where, for passive local techniques, three methods are evaluated (under/overfrequency, under/overvoltage and phase jump detection) and, for active local techniques, two methods are evaluated (active frequency drift and active frequency drift with positive feedback). The analysis will take place through computer simulation and it aims to observe the non-detection zone and the trip time of each technique so that the most effective ones can be considered and it can be proposed ways to get around the main limitations of each method.