Enhanced Comb-Frequency Locked Loop Based Control of Grid-Tied PV System

This paper deals with the enhanced comb-frequency locked loop control approach for grid integrated single stage solar photovoltaic (PV) system. The PV array is interfaced to the grid using a voltage source converter (VSC). An incremental conductance technique is utilized to extract the peak power of the PV array. This control approach mitigates the power quality problems and provides the operation of the system smooth and fast. The developed prototype of the PV system is tested at different type of grid disturbances like harmonic distortions, and load unbalances. Moreover, the capabilities of proposed control are found superior compared to other control techniques. Test results of the grid interfaced PV system is used to validate the control algorithm.