Abstract
A solar photovoltaic array (PVA) generation unit, connected to a weak distribution utility grid, is presented in this work. The PVA power is maximized by an incremental conductance (InC) strategy controlled boost converter. The weak grid is vulnerable to distortions, unbalance, voltage sag, and voltage swell. The implemented control structure utilizes a grid voltage filtering (GVF) stage, which keeps these grid voltage defects from impacting the regulated grid currents. The GVF also neutralizes any DC offset in the voltage signal. The DC link voltage is flexibly controlled to prevent overmodulation operation at unfavorable grid scenarios. The flexible control retains the grid power quality at severe unbalanced voltage conditions. The system operation is resilient to fluctuations in the PVA power, load currents or the grid voltages. The fast assessment of the load current weights prevents DC link voltage deviations at load fluctuations. The system capability at challenging operating scenarios, is presented for the system validation.
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