Wind turbine generator system and operation control method thereof

摘要

10-567 [Abstract] An object of the present invention is to provide a wind turbine generator system and an operation control method thereof, which has a superior operation efficiency and stability at a low wind speed and during the 5 occurrence of a gust and is equipped with Ride Through function at Grid low voltage condition. The wind turbine generator 1 comprises a hydraulic pump 12 of a variable displacement type which is rotated by the main shaft 8, a hydraulic motor 14 of a variable displacement type which is connected to the generator 20, and a high pressure oil line 16 and a low pressure oil line 18 10 which are arranged between the hydraulic pump 12 and the hydraulic motor 14. An accumulator 60 is connected to the high pressure oil line 16 via an accumulator valve 62. ACC valve control unit 38 controls opening and closing of the accumulator valve 62 based on at least one of wind speed and the state of the grid 50.