The principle of wind turbine generator

The working principle of wind turbine is through the impeller will wind into mechanical torque (rotor inertia), through the main drive chain, the gearbox growth to the rotor speed, the excitation of the generator stator excitation converter and power grid. If more than the generator synchronous speed, the rotor is in the state of power, feed to the grid through the inverter. In addition to the traditional Cummins generator in generator manufacturing, also began to pay attention to this new environmental protection generator manufacturing.

The wind power generator is simple and can be composed of two parts of the impeller and the generator, standing in a certain height of the tower dry, this is small off grid wind turbine. A wind generator initial power wind changes from time to time, voltage and frequency stability, no practical value. In order to solve these problems, the modern wind increased the gear box, yaw system, hydraulic system, brake system and control system, to increase the utilization and development of wind energy.

The gear box can be very low speed wind wheel (1500 kW wind turbine is usually 12-22 RPM) into a high speed of the generator (generator synchronous speed is 1500 rpm). At the same time the generator is easy to control, to achieve a stable frequency and voltage output. The yaw system can make the wind wheel swept area is always perpendicular to the main direction. You know, 1500 kilowatts of wind turbine cabin weight more than 50 tons, 30 tons of impeller, such a system at any time on the main wind direction had a considerable technical difficulty.

There are many fan rotating parts, engine rotating surface in the horizontal alignment direction at any time, yaw; the wind wheel along the horizontal axis, so as to generate dynamic torque. For variable pitch fan, composed of blades to shaft center of rotation around the roots, so as to adapt to the different wind conditions and pitch in. When the machine is stopped, the blade feathering, so as to form a damping brake.

In the early days, hydraulic system was used to adjust the blade pitch moment (used as damping, stopping, braking, etc.), and now the electric distance change system gradually replaces hydraulic variable pitch

1500 kilowatts of wind machine, usually in the 4 meters / seconds speed automatically starts at 13 m / sec issued around the rated power. Then, with the increase of wind speed, power control has been in the vicinity of rated power, until the wind speed of 25 m / sec automatic shutdown.

The ultimate wind speed of the modern fan is 60-70 meters per second, that is to say, at such a large wind speed, the wind turbine will not be destroyed immediately. The theoretical 12 stage hurricane has a speed range of only 32.7-36.9 meters per second

The air blower control system according to the wind speed and direction to control the system, running on voltage and frequency stability, automatic grid and off grid; at the same time the operating temperature of gearbox and generator, hydraulic system, the emergence of any abnormal alarm, automatic shutdown when necessary, which belongs to the unattended independent power generation the system unit.

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