Proposta de controle do sistema de geração de energia fotovoltaica conectada à rede elétrica

Abstract

This work presents the modeling and simulation of a photovoltaic conversion system connected into the three - phase electrical grid. For modeling of the PV module the single diode model was used, the studies and the parameters of the model were raised for the module KD210GX - LPU of the manufacturer Kyocera. The modules were associated in series and the Maximum Power Point Tracking (MPPT) technique was applied based on the Pertub and Observe (PeO) algorithm that has the function of obtaining the maximum power of the array. The PV array terminals are connected directly to the DC bus of the DC-AC power electronic converter using the single-stage topology with the functions of performing the power flow and keeping the DC bus voltage stabilized. The interface with the electric grid is realized by means of an inductive filter in order to reduce the total harmonic distortions of the output current. It also shows the control of the DC-AC converter of the system formed by two cascade control meshes: current control and DC bus voltage control. All simulations were performed through MatLab / Simulink R software. Two scenarios for irradiances of 1000 W/m2 and 400 W/m2 with the constant temperature of 25 oC and a third scenario with irradiance of 800 W/m2 and temperature of 47, 9 oC. The photovoltaic system remains controlled and injecting active power into the grid for the three scenarios. The MPPT algorithm works properly by improving the power output for different irradiances and temperatures.