The connection of the photovoltaic power plants which have capability of low voltage ride-through (LVRT) brings the grid protection a series of challenge. Firstly, the requirements of PV’s LVRT capability and the time limit of anti-islanding protection detection which the current standards asked are researched in detail based on the structure of photovoltaic power plants. Secondly, the failure characteristics of photovoltaic power plant with the ability of LVRT are studied based on PSCAD/EMTDC. Thirdly, based on the failure characteristics of the photovoltaic power plant, the impact of PV power plant’s LVRT ability on the current three sections protection, reclosing, fuses is studied in-depth when it joins in the distribution network and transmission network; the cooperation problems of PV power plant’s LVRT ability with the DC-side protection of PV’s inverter, anti-islanding protection, main transformer protection, line longitudinal differential and distance protection are analyzed deeply. Finally, the corresponding setting principle and improvement measures are put forward.