Fig. 9From: A robust model-free controller for a three-phase grid-connected photovoltaic system based on ultra-local modelOperation under normal conditions with step change in \(i_{qr}\): Top. Current \(i_{q}\) (A) (dotted line) and its reference \(i_{qr}\) (solid line). Bottom. Grid current and voltage waveforms: Current \(4 \times i_{a}\) (A) (solid line) and voltage \(e_{a}\) (V) (dotted line)Back to article page