Active Power Filter for Power Quality in Grid Connected PV-System using an Improved Fuzzy Logic Control MPPT

Photovoltaic (PV) system is one of the most important and fastest developing renewable energy sources in the globe recently. Since most of the grids contain a power converter system based on power electronic components and several nonlinear loads, which deteriorate power quality. In this paper, the aim is to propose a solution to solve this problem using a shunt active filter SAPF based on efficiency method called Synchronous Detection Method SDM, in the identification of the harmonic currents. The SAPF controller consists of an inverter which works as a multi-functional device, it adopted to interface PV system with the electrical grid and at the same time, to eliminate harmonics generated by nonlinear loads with reactive power compensation. To extract the maximum power in photovoltaic system a fuzzy logic control is proposed to solve a fast irradiation change problem which is compared to the conventional P&O algorithm. The simulation results using Matlab/Simulink show that the fuzzy logic control MPPT gives the best performance with small oscillation in output power, at the same time. The proposed control strategy of SAPF performs the power quality in grid-connected photovoltaic system with smaller total harmonic distortion, grid synchronization and unity power factor.