Photovoltaic（PV）power generation system is required to pass the low-voltage-ride-through（LVRT）testbefore access to the power grid. Current LVRT test schemes are generally based on test bench applyingimpedance-based voltage divider which is costly and difficult to realize in the labs. In this paper

an electricclosed loop LVRT test scheme and its corresponding test bench for PV generation

based on fully-ratedconverter

is proposed. By applying three phase half-bridge topology and electric closed loop structure for DCbus

the power consumed by the inverter and the bench is decreased

which facilitates the bench to apply inthe labs. Several typical types of voltage sag are analyzed and specific implementation methods for the bench aregiven in the paper. Finally

comparative analysis is carried out between the proposed test bench and that basedon the impedance-based voltage divider through simulation

and the result verifies the effectiveness of theproposed LVRT test scheme.