Reactive power compensation

Because induction generator absorbs reactive power from the grid to make wind turbine power factor reduced, and net operating wind turbines generally require the power factor above 0.99, it is necessary to use capacitors for reactive power compensation . Due to random changes in wind speed, rated power is reached before the size of the generator output power of random variation, and therefore compensate for the capacitance of the input and removal of the need for automatic control, by a computer according to the changes in the output reactive power, control, compensation capacitor or the removal of sub-investment to ensure that power factor meet the requirements. For the doubly-fed generator is directly controlled by the control system and regulation of reactive power.

Yaw control and automatic Jie Lan

① Automatic Wind

Normal operation automatically when the yaw control system for wind, that is, when the cabin the wind direction deviated from a certain angle, the control system to the left or right to issue instructions to the transfer, the cabin began to wind, When you reach the allowable error range, automatically wind turbines

② Auto-Jie Lan

When the cabin in the same direction after the cumulative circle deflected 2.3, if the wind speed is less than the wind turbine at this time to start wind speed and no power output, then the shutdown, the control system makes the cabin in the opposite direction around the rotating solution of 2.3 ring; if the unit has power output at this time, automatic solution is temporarily bypass; if the cabin to continue to deflect the same direction, accumulated over three laps, then control the shutdown, solutions around; Ruo Yin Fault Auto Solutions is not around the success of the twisted rope of 4 laps, twisted rope mechanical switch will move , this time twisting cable fault reporting, automatic shutdown; to wait for manual Jielan operation.

③ Wind Wheel Protection

When there are big strong winds occur, downtime and the release of tip-damping plate, transferred to the greatest pitch, yaw 90 degrees leeward in order to protect the wind generators wheel against damage.

Shutdown Control

When the controller issued a normal shutdown command, the wind turbine will be shut down the following procedures: ① removal compensation capacitor; ② release tip sheet damping; ③ generator off-grid; ④ generator speed measurements down to set the value, the input mechanical brakes; ⑤ In case of car trouble while Lee received paddle in the cabin, such as 90 degrees yaw leeward.

When an emergency shutdown fails, the implementation of such as non-stop operation: First, removal of compensation capacitors, tip-damping plate movements, delay 0.3 seconds after the caliper brake action. Detection of instantaneous power is negative or less than the synchronous speed when the generator to convey; generator solution column (off-grid), if the braking time of more than 20 seconds, speed has not dropped a set value, then the closed paddle, cabin yaw 90 degree leeward.

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