The fundamental difference in grid synchronization requirements between these two technologies lies in the scale of the control loop architecture relative to the power conversion stage. A string inverter manages a high-voltage DC bus connected to many solar panels in series, requiring a single, high-power controller to track the grid phase via a Phase-Locked Loop. This loop must filter out high-frequency noise from a large power stage to maintain low Total Harmonic Distortion, which is ....
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