Double-fed speed of modern wind turbine is the working principle of wind power through the impeller will turn into a machine from the (wind round moment of inertia), through the main transmission chain, a gear box to the growth rate of speed asynchronous generators, through the exciting changes Current exciter stator and the power generators will be incorporated into the power grid. If more than speed synchronous generator rotor was in power, and through the converter to the power grid feed.

The simplest wind turbine and wind generator can be impeller two parts, the legislature in certain high tower on the stem, which is off-grid small fan. The initial issue of wind power generators, sometimes without the wind changes, voltage and frequency of instability, no practical value. To solve these problems, an increase of the modern fan gear box, yaw system, hydraulic systems, braking systems and control systems.

Gearbox can be a very low round of the wind speed (1500 kilowatts of fans usually turn 12-22 / points) into a high speed generator (synchronous generator speed is usually 1,500 to / points). Generators also makes easy to control and achieve a stable output voltage and frequency. Yaw system can wind round Swept area is always perpendicular to the main wind direction. We should know that 1,500 kilowatts of the cabin air more than 50 tons of gross weight, the impeller 30 tons, so that such a system at the main wind direction at any time there are considerable technical difficulties.

There are many fan of rotating parts, the water level in the cabin rotation, the wind direction at any time yaw; along the horizontal axis wind round of rotation in order to generate momentum torque. Moment of change paddle fan, composed of wind round the leaves should focus on the roots of the central axis rotation, in order to adapt to different wind conditions and variable pitch. In the stands, with propeller blades must, in order to brake a damper.

Early use of the hydraulic system for regulating the propeller blades moments (at the same time as a damper, downtime, brake status, such as the use of), now changed from the system, gradually replacing the hydraulic pitch.

On 1,500 kilowatt fan, usually in the four m / s wind speed of around automatically activated in 13 m / s around a rated power. Then, as the wind speed increases, has been rated power control in the vicinity of power generation, until the wind speed reached 25 meters / second when the automatic shutdown.

Fans of modern design wind speed limit for the 60-70 m / s, meaning that in such a big fan speed will not be immediately destroyed. In theory the 12 hurricanes, the scope of its wind speed was only 32.7-36.9 m / sec.

Fans of the control system should be based on wind speed, wind direction on the control system, in a stable voltage and frequency of operation, automatically and networks and from network surveillance gear box at the same time, the generator operating temperature, oil pressure hydraulic system, For any anomalies in the police and, if necessary, automatic shutdown, are unattended independent power systems unit.