Voltage and frequency response of three phase grid tie solar inverter during LVRT

The aim of this paper to check the voltage and frequency response of three phase solar PV grid tie string inverter during low voltage ride through. The LVRT performance of an inverter is being checked by its compliance to Central Electricity Authority (CEA), India guidelines, 2019 for grid tie equipment. The study shows that the voltage of the inverter follows the grid with LVRT but in case of frequency, small transients were observed. Similarly, the voltage harmonics generated by the inverter is within the limit throughout the curve but exceeds 5% during the transition from 100% to 15% voltage level.