Power Quality Enhancement In Grid-Connected Solar Pv Via Shunt Active Filters And Optimized Mppt Algorithms

Abstract

This research shows a novel shunt active power filter (SAPF) paired with an advanced pulse width modulation (PWM) controller designed to reduce source current distortion and enhance power quality. The PWM controller effectively cancels distortions and stabilizes output voltage by filtering notches at output, including and excluding LCL filter compensation. Simulations using Power Simulator (P-Sim) demonstrate that the SAPF combined with an LCL filter reduces total harmonic distortion (THD) in source current to about 2.71 percent, significantly lower than the THD in load currents. The LCL filter smooths and isolates high-frequency harmonics, though its size must balance harmonic reduction and transient protection. The control method ensures that supply currents are sinusoidal, balanced, and maintain a unity power factor, compensating for unbalanced nonlinear loads and reactive power. The current controller responds quickly without causing transients, keeping the supply current below the load current, and efficiently lowering the THD. Additionally, the system integrates an optimum power point (MPPT) controller tracking based on the perturbation and observation (P&O) technique for grid-connected inverters, improving the grid-renewable energy interfacing. In general, the combination of innovative SAPF, PWM control, LCL filtering, and notch filter compensation provides an effective harmonic mitigation strategy and consequently a more optimized and reliable solar photovoltaic system with enhanced power quality.