Answer: A, C
According to paragraph 6 of Article 5.2.2 of the "Wind Farm Design Code" (GB 51096-2015), the operational adaptability of wind farms should meet the following requirements: ① When the voltage at the grid connection point of the wind farm is within the range of 0.9 times to 1.1 times the rated voltage (including the boundary value) of the nominal voltage, the wind turbine is running. ② When the power system frequency is within the range of 49.5Hz ~ 50.2Hz (including the boundary value), the wind turbine should be able to operate normally; when the power system frequency is within the range of 48Hz ~ 49.5Hz (including 48Hz), the wind turbine should be able to not go off the grid Run for 30 minutes.