Synchronization of a single-phase photovoltaic generator with the grid

This paper presents the architecture of a hybrid phase lock loop circuit topology for synchronizing a single-phase inverter fed from a renewable energy source such as a photovoltaic (PV) generator to the low voltage utility grid. The system uses a digital phase lock loop (DPLL) architecture, which is based on the arctan phase detector, driving a phase lock loop (PLL) to synchronize a PV generator with the grid. The proposed system has been tested by simulation using Simulink/Matlab. The test results, which are also presented, demonstrate the ability of the system to synchronize a PV inverter with the grid and to regain synchronization following a sudden change in the phase of the grid voltage.