变桨器故障引发停机对海上桁架式Spar风机运动的影响

应用空气动力-水动力时域耦合模型,模拟风机叶片因变桨器故障而卡住并由此引发的停机过程,研究此故障情况对海上桁架式Spar风机系统6个自由度运动响应的影响。研究结果表明:开发的数值模型成功地模拟了风机进入停机过程中的电网断开以及空气动力制动,预报的纵摇运动与其他数值模型的结果接近。通过桁架式Spar风机系统在正常工作情况和故障情况下的对比发现:纵荡、纵摇、横荡以及横摇的振幅因故障而增大,艏摇运动在停机过程中被快速激发,振幅大幅增加,揭示了此类故障对海上Spar风机系统的安全性构成威胁。

INFLUENCE OF PITCH ACTUATOR FAULT AND SHUTDOWN PROCEDURE ON THE RESPONSE OF A TRUSS-SPAR-TYPE OFFSHORE WIND TURBINE

In this paper, based on an aero-hydrodynamic coupled time-domain numerical model, the scenario where one blade seized up due to pitch actuator fault, followed by shutdown procedure was simulated. The influence of this fault condition on the six-degree-of-freedom response of a truss-spar-type offshore wind turbine was studied. The simulation results showed that the present numerical model successfully simulated the process of grid loss and aerodynamic braking during the shutdown procedure. In addition, the predicted pitch motion matches well with that predicted by another numerical model. Through the comparison of the responses between the normal working condition and the fault condition, it was found that the amplitudes of the surge, pitch, sway, and roll motions were increased by the shutdown procedure. The yaw motion is quickly excited, with its amplitude amplified significantly. These results reveal the threat of the present shutdown procedure on the operation safety of the Spar-type offshore wind turbine.