Análise da gestão de energia em sistema de geração fotovoltaica utilizando sistema de armazenamento por baterias

Abstract

This article investigates the quality of electrical energy and a proposal for a solution to problems presented the microgeneration photovoltaic consumer units with caused by the intermittence of the solar source in electrical distribution systems through a combination of a solar energy generation system with an energy storage system (SAE). The solar power generation system is connected to the DC bus by a DC stage (boost converter) incorporated into a maximum power point tracking algorithm (MPPT). The SAE is composed of a battery bank and a bidirectional converter DC-DC (BDC) responsible for charging and discharging the batteries through a control proposal and by connecting the bank to the DC link. The connection with the distribution transformer that interfaces with the three-phase electrical grid is made by the voltage source converter (VSC) that also acts as a parallel active filter (FAP) at the common coupling point (PCC), at this point, non-linear loads present in consumer units of distributed microgeneration are connected. The method used for system synchronization was the Dual Second Order Generalized Integrator (DSOGI-PLL). The proposed system presented a good functioning and a good energy management strategy. The DSOGI-PLL performed well in the face of various disturbances in the electrical grid. The network current Total Harmonic Distortion (THD), with the action of the FAP, was significantly reduced. The P&O tracking algorithm presented high performance against a system without shading and is easy to implement.