A Grid Connected Solar Photovoltaic System with Multilevel Shunt Active Power Filter for Power Quality Enhancement
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This paper presents a shunt active power filter based on a three-phase 3-level Neutral Point Clamped (NPC) inverter for grid-connected Photovoltaic (PV) systems. The main objectives to be met are: i) Ensuring maximum power extraction from the PV panels, by forcing the voltage across the PV panel to track a suitable reference provided by P&O algorithm; ii) Assuring Power Factor Correction (PFC) by forcing grid currents to be sinusoidal and in phase (or opposite phase) with grid voltages. In order to achieve these objectives, a cascade control strategy with two imbricated loops is designed. Lyapunov approach and sliding mode control are used in the inner loop to meet the PFC requirement. As for the outer loop, it is designed using the PI regulator and P&O algorithm to satisfy the voltage regulation objective. Lastly, simulation results are performed in the MATLAB/SimPowerSystems environment to demonstrate the effectiveness of the proposed controller.
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