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Performance of grid interfaced solar PV system under variable solar intensity

This paper proposes an enhanced phase locked loop (EPLL) based control algorithm of a double stage solar photovoltaic (PV) grid interfaced power generating system, which also mitigates power quality problems in 3P4W (three phase, four wire) distribution system. The proposed solar PV grid interfaced system consists of solar PV array, boost converter, four-leg voltage source converter (VSC) and connected linear/nonlinear loads. 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. Proposed solar PV grid interfaced power generating system is modeled and simulated in the MATLAB and results are shown to validate the design and control for feeding 3P4W loads with improved power quality.