Research on the control strategy of PV grid-connected inverter upon grid fault

To stabilize the PV-connected grid with high penetration factor, the State formulates strict provisions on connecting the PV power stations into the power grid to ensure the safety of power system. On the basis of high-power PV power station LVRT technology, this paper elaborates the research on solving the inverter protection upon low-voltage operation by means of the control strategy under conditions of not adding other hardware to fulfill the safe ride through in the low-voltage zone, and to provide the power grid with reactive support, so as to help the recovery of grid system.