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

ABSTRACT:

 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.

KEYWORDS:

 

1.      Shunt Active Power Filter

2.      Grid connected PV system

3.      MPPT (P&O)

4.       Fuzzy Logic controller

5.       Power quality enhancement

SOFTWARE: MATLAB/SIMULINK

CONCLUSION:

This paper presents the simulation performance of a three-phase inverter-based multifunction PV power system with shunt active filtering capability. The simulation results show that the proposed multifunctional grid-connected PV power system is efficient for maximum PV power injection to the grid while filtering the current harmonics and compensating reactive power caused by nonlinear loads. Furthermore, a fuzzy logic controller based on P&O MPPT is applied in the PV system and compared with the conventional P&O algorithm. Under fast irradiation this FLC technique represents a good performance and increases the system efficiency. The simulation results show that the power control with multifunctional inverter is mostly achieved because in the daytime with intensive irradiation, the solar PV power system provides active power together with active power filter functionality. At night and/or during poor irradiation times, the active power required by the loads is supplied from the utility and the power quality is improving by SAPF.

REFERENCES:

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