Sistema de inyección de energía cooperativo para plantas de generación fotovoltaica

Resum

This document has been carried out with the goal of developing a power system to inject the energy of a photovoltaic plant into the grid. The innovation of the work consists in a proposed topology that relies on the cooperative association of two inverters, a multilevel and a traditional one, to improve the whole efficiency with higher power quality. Firstly, a present study about the distributed generation sources is done in order to set the general objectives. Later, an overview of the grid connected photovoltaic power injection systems is summarized from the literature. Next, the different methods of the basic functions associated to these systems, including the maximum power point tracking, the synchronization algorithm and the anti-islanding, are mentioned. The proposed topology is developed after an analysis of the n-level inverters, and specifically the two-level inverter and the neutral point clamped inverter, including the losses study of both converters. A grid synchronization method has been proposed too as a part of the control algorithm, which improves the response under distorted conditions. Finally, the cooperative topology proposed is presented, in its single-phase and three-phase structure, as a grid connected photovoltaic power injection system composed by a neutral point clamped that injects the power quantity term and a traditional inverter that controls the power quality term. The topology is validated through experimental results.