Voltage drop was one of the most serious problems for the operation of the transmission and distribution networks. With the growing penetration level of distributed photovoltaic power sources, the latest domestic and international standards require that the PV inverter must have low voltage ride through capability. In order to eliminate the active power oscillations, an improved active/reactive current injection strategy was proposed on the basis of the conventional positive/negative sequence control. As the current voltage support schemes fail to limit voltage lifting range, a complete control scheme intended to regard three phase voltage amplitudes as the control target to regulate the maximum and minimum phase voltages at the point of common coupling within the limits established in grid codes for continuous operation. A mathematical model adapted to different types of voltage dips was derived in detail and reactive power reference was also calculated after that. Finally, the results of simulation confirmed the correctness and effectiveness of the proposed strategy.