Wind turbine controller system will be the mainly control system for preserve and adjust the normal operation for the wind generator. Both should really take consideration of the wind energy and generator characteristic plus the users? demand and capability to pay, finial to accomplish the effects of practical use, reliable and economical.
Generally, the method of wind turbine controller method is often divided as three states, standby state, working state, stopped state.
Standby state. When the wind speed is much less than 3m/s, also the power of generator is lower than 10HZ; the wind turbine could not begin since this condition is out of the setting. At this condition, the wind turbine is rotating automatically, so whatever the wind orientation is, the wind turbine controller will not operate.
Working state. When the wind turbine controller is inside the working condition, it will real time control the generator information, including the output voltage, winding speed and temperature to assure stability and operation security under the rated output power. The control approach might be separated as 3 kinds. Automatically control, the wind turbine controller automatically orders blade to adjust the optimum position of face the oncoming wind to obtain extra energy. Yaw control, if the wind is too powerful, controller directs blade a yew angle to keep the blade secure. Brake control, if the wind speed reach the upper limit level, then the controller give a stop order directly to avoid the incidents.
Stopped state. If any 1 of below condition occurred, the wind turbine controller will stop the turbine. By way of example, detect the wind indicator broken and generator is under overvoltage. Yaw controller has difficulty. Electricity net power down. Occured alerting.
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