Grid integration of solar PV power generating system using QPLL based control algorithm

This paper deals with the grid integration of a double stage solar photovoltaic (SPV) power generating system using two-quadrature PLL (QPLL) based control, which also mitigates power quality problems in three phase, three wire distribution system. The proposed solar PV grid interfaced system consists of solar PV array, dc-dc boost converter, voltage source converter (VSC) and connected linear/nonlinear loads. The maximum power is tracked from SPV array using incremental conductance maximum power point tracking (MPPT) technique. The proposed solar PV power generating system provides load balancing, eliminates harmonics, corrects the power factor, and regulates at PCC (Point of Common Coupling) voltages under different loads. The proposed system is modeled and simulated in the MATLAB/Simulink and results are shown to validate the design and control algorithm.