초록 ▼

A wind turbine generator system includes: a wind turbine rotor including a blade having a variable pitch angle; a generator driven by the wind turbine rotor; and a control unit controlling the output power of the generator and the pitch angle of the blade in response to the rotational speed of the w

A wind turbine generator system includes: a wind turbine rotor including a blade having a variable pitch angle; a generator driven by the wind turbine rotor; and a control unit controlling the output power of the generator and the pitch angle of the blade in response to the rotational speed of the wind turbine rotor or the generator. The control unit performs a first control in which the output power is controlled in accordance with a predetermined power-rotational speed curve until the rotational speed is increased to reach a predetermined rated rotational speed, and performs a second control in which the output power is controlled to a predetermined rated power when the rotational speed exceeds the rated rotational speed; the control unit is responsive to the pitch angle for maintaining a state of performing the second control is or for switching to a state of performing the first control, when the rotational speed is reduced below the rated rotational speed after the control unit is once placed into the state of performing the second control.

대표청구항 ▼

What is claimed is: 1. A wind turbine generator system comprising:a wind turbine rotor including a blade whose pitch angle is variable;a generator driven by said wind turbine rotor; anda control unit controlling output power of said generator and said pitch angle of said blade in response to a rotat

What is claimed is: 1. A wind turbine generator system comprising:a wind turbine rotor including a blade whose pitch angle is variable;a generator driven by said wind turbine rotor; anda control unit controlling output power of said generator and said pitch angle of said blade in response to a rotational speed of said wind turbine rotor or said generator,wherein said control unit performs a first control in which said output power is controlled in accordance with a predetermined power-rotational speed curve until said rotational speed is increased to reach a predetermined rated rotational speed, and performs a second control in which said output power is controlled to a predetermined rated power when said rotational speed exceeds said rated rotational speed, andwherein, when said rotational speed is reduced below said rated rotational speed after said control unit is once set to the state of performing said second control, said control unit maintains the state of performing said second control for a case when said pitch angle is larger than a predetermined pitch angle, and does not switch to the state of performing said first control until said pitch angle reaches said predetermined pitch angle, and said control unit is switched to the state of performing said first control irrespectively of said pitch angle, when said rotational speed is reduced below a predetermined threshold rotation speed which is lower than said rated rotational speed after said control unit is once placed into the state of performing said second control.