流入風観測を用いた風車制御

抄録

For the further introduction of wind power generation, to improve the reliability of wind turbines is required. When the wind turbines are operated above rated wind velocity, the output power is kept constant, however, the rotor thrust may fluctuate due to the wind velocity fluctuations. The load fluctuations of rotor cause many kinds of failures in the drivetrains. The failures in drivetrain need the long repair period. Suspended operation makes the loss of power production. The reliability of drivetrain is most important issue for the wind power cost. Therefore, the suppression of load fluctuation in the rotor thrust leads to improve the reliability of wind turbines. In this paper, the possibility of rotor thrust control supported by inflow measurement using ultrasonic anemometer was evaluated for suppressing the fluctuation of rotor thrust. The feedforward control for the pitch system is demonstrated with a 30kW test wind turbine. For the feedforward control, the blade pitch angle is set to keep the rotor thrust as constant level according to the inflow wind velocity. The target pitch angle is decided by referring to the database calculated by the result of the preliminary measurement. The time series of pitch angle is fitted the timing of inflow wind arrival to the rotor surface. The pitch angle can control the rotor torque and thrust. The effect of rotor thrust fluctuation suppression by feedforward control with pitch angle operation was compared and evaluated with rotor thrust fluctuation by normal control.