Desconexão e conexão automática com a rede elétrica de um sistema fotovoltaico com SAE controlado no modo tensão

Abstract

In surpassing the solutions of energy sources of convenience, Renewable Energy Sources (RES) are the introduces in the energy matrix. Such sources have several advantages. When available with as non-renewable, for example, the reduction in the emission of gases pollutants in the atmosphere present in the thermal generation. In addition, there is no risk of accidents. That can contaminate areas such as industrial plants. One of the possibilities to connect a RES to the electricity grid, is through Distributed Generation Systems (DGS), which has advantages over conventional generation. about SGDs are connection to the electrical grid tied power converters, e.g. in generation photovoltaic PV and wind generation. There are different ways to operation of such converters, which can guarantee the reliability and stability of the system, being also to provide possible network support. When controlling in voltage mode, it is perform control of possible voltage and frequency of the Point Coupling Common (PCC), in addition to enabling operation in island mode, that is, isolated from the power grid. For operating during islanding and effectively transition between operating modes is the use of necessary control structures. In this sense, carrying out this work has the objective of detecting the islanding condition through a Islanding Detections Methods (IDM) in a photovoltaic DGS with Energy Accumulation System (EAS) controller in gridforming. The control structure is responsible for detecting the islanding, performing a system disconnection. During islanding, the system needs to provide the power of loads with rated frequency and voltage. When the network returns to normal operation, the system must be reconnected properly, voltage rises and frequency. Simulation results are presented to verify the performance of the IDM used in this work.