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Simulation and Analysis of Grid-connected PV System with Active Filter based on P-Q Theory

Roopal R Kapadia, D. M. Patel, J. J. Patel

Abstract


This paper presents a comprehensive analysis of two grid-connected photovoltaic (PV) systems, one with a 100-kW capacity and the other with a 25-kW capacity, incorporating an active filter based on the Instantaneous Reactive Power Theory (P-Q theory). In comparison to passive filters, the active filter based on the P-Q theory offers several advantages. While passive filters are limited in their ability to adapt to varying grid conditions and load profiles, the active filter provides dynamic compensation, allowing for efficient harmonic mitigation across a wide range of operating conditions. Furthermore, passive filters introduce additional losses due to their inherent impedance, leading to a decrease in overall system efficiency. On the other hand, the active filter, by dynamically adjusting its parameters based on real-time measurements, minimizes losses, and maximizes power transfer efficiency. The primary objective is to mitigate harmonics and achieve compliance with the IEEE 519 standard, specifically targeting a reduction from 36.98% Total Harmonic Distortion (THD) to 3.45% THD. The P-Q theory is employed to design the active filter, which effectively compensates for reactive power and mitigates harmonic distortions in the system. Simulation studies are conducted using MATLAB/SIMULINK tools to validate the effectiveness of the proposed active filter. The analysis and simulation results presented in this paper serve as a valuable reference for the design and implementation of grid-connected PV systems with active filters.


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References


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