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

 ABSTRACT

Recently, Photovoltaic (PV) systems have become one of the most significant and rapidly developing renewable energy sources worldwide. However, most grids include a power converter system based on power electronic components and several nonlinear loads that degrade power quality. This paper proposes a solution to this problem using a shunt active filter (SAPF) based on an efficiency method called the Synchronous Detection Method (SDM) to identify harmonic currents. The SAPF controller comprises an inverter that functions as a multi-functional device, interfacing the PV system with the electrical grid and eliminating harmonics generated by nonlinear loads while providing reactive power compensation. To extract maximum power from the photovoltaic system, a fuzzy logic control is proposed to address the fast irradiation change problem, which outperforms the conventional P&O algorithm. The simulation results using Matlab/Simulink show that the fuzzy logic control MPPT yields the best performance with minimal oscillation in output power. Moreover, the proposed control strategy of SAPF improves power quality in grid-connected photovoltaic systems, resulting in smaller total harmonic distortion, grid synchronization, and unity power factor.

KEYWORDS

Shunt Active Power Filter; Grid connected PV system; MPPT (P&O); Fuzzy Logic controller; power quality enhancement.

Block Diagram:

                                           Figure.1. Proposed control algorithm of SAPF.

Expected Simulation Results:

                                                                Figure.2. profile irradiation

Figure.3. Active power of PV Panel, Source and filter.

Figure.4 DC link voltage with P&O MPPT.

Figure.5. source current

Figure.6. source current FFT before filtring and after SAPF implementation.

Fig.7. source current spectrum in SAPF-PV System

Figure.8. PV current and voltage with FLC controller.

Figure.9. PV Power with FLC controller

Figure.10. DC link voltage with FLC controller.

Figure.11. source current with FLC controller.

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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