Wind power generation method and wind power generation system

A wind power generation system, comprising:

• a wind turbine having a rotor with multiple blades;
• a generator connected to a main shaft of the rotor;
• a clutch provided between the main shaft and the generator and is capable of interrupting transmission of power between the main shaft and the generator;
• a rotational speed detector for detecting the peripheral speed or rotational speed of the rotor;
• an anemometer for detecting an average wind speed toward the rotor;
• and
• a control device,
• wherein the control device repeats following operations;
• disconnecting the clutch to idle the rotor when the wind speed detector detects a predetermined average wind speed,
• connecting the clutch for generating power by the generator when the rotational speed detector detects the peripheral speed or the rotational speed of the rotor at a specific value,
• connecting the clutch for generating electric power by the generator,
• disconnecting the clutch again when the wind speed detector again detects the predetermined average wind speed,
• connecting the clutch again for generating power by the generator when the peripheral speed or the rotational speed of the rotor reaches the specific value again.

A wind power generation system, comprising:

• a wind turbine having a rotor with multiple blades;
• a generator connected to a main shaft of the rotor;
• and
• a clutch provided between the main shaft and the generator and is capable of automatically interrupting transmission of power between the main shaft and the generator,
• wherein the clutch is configured to repeat following processes,
• disconnecting the clutch automatically to idle the rotor when the rotor is rotating at or below a predetermined average wind speed,
• connecting the clutch automatically for generating power by the generator when the rotor reaches a specific peripheral speed or rotational speed,
• disconnecting the clutch automatically again when the rotor is rotating at or below the predetermined average wind speed, to idle the rotor until the specific value of the peripheral speed or the rotational speed is reached, and
• connecting the clutch automatically again for enabling power generation by the generator when the rotor reaches the specific value.