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    • 6. 发明申请
    • CONTROL STRATEGY FOR WIND TURBINE
    • 风力发电机控制策略
    • WO2010060772A2
    • 2010-06-03
    • PCT/EP2009/064698
    • 2009-11-05
    • VESTAS WIND SYSTEMS A/SHAMMERUM, Keld
    • HAMMERUM, Keld
    • F03D7/04
    • F03D7/022F03D7/0296F03D7/043F05B2270/32F05B2270/322F05B2270/331F05B2270/807Y02E10/723
    • The invention relates to a method for controlling and regulating an operational parameter of a wind turbine blade such as e.g. a blade pitch angle, a position of a flap, or other means for changing the aerodynamic surface of a blade. These are controlled on a wind turbine during operation with the purpose of reducing any extreme tower loads. Based on a measured acceleration of the nacelle, the velocity of the wind turbine nacelle and a position of the wind turbine nacelle relative to a running mean are determined and from these the actual operating situation. This actual operating situation is compared to a predetermined space of acceptable operating situations determined from a set of normal operating situations. A control strategy is then chosen from a predetermined set of strategies. The method further comprises the steps of defining a control function for the operational parameter based on the chosen predefined control strategy, and controlling at least one of the operational parameters of at least one of the wind turbine blades in accordance with the control function.
    • 本发明涉及一种用于控制和调节风力涡轮机叶片的操作参数的方法,例如, 叶片俯仰角,翼片的位置或用于改变叶片的空气动力学表面的其它装置。 这些在操作期间在风力涡轮机上控制,目的是减少任何极端的塔式载荷。 基于机舱的测量加速度,确定风力涡轮机机舱的速度和风力涡轮机机舱相对于运行平均值的位置,并从这些实际操作情况确定。 将该实际操作情况与从一组正常操作情况确定的可接受操作情况的预定空间进行比较。 然后从预定策略集中选择控制策略。 该方法还包括以下步骤:基于所选择的预定义的控制策略来定义用于操作参数的控制功能,以及根据控制功能来控制至少一个风力涡轮机叶片的至少一个操作参数。
    • 7. 发明申请
    • MONITORING OF BLADE FREQUENCIES OF A WIND TURBINE
    • 风力涡轮机叶片风速的监测
    • WO2009021900A1
    • 2009-02-19
    • PCT/EP2008/060385
    • 2008-08-07
    • SIEMENS AKTIENGESELLSCHAFTEGEDAL, PerSTIESDAL, Henrik
    • EGEDAL, PerSTIESDAL, Henrik
    • G05B23/02
    • G05B23/0237F03D17/00F05B2270/807G01H1/006
    • The present invention relates to a method for monitoring blade frequencies of a wind turbine and a monitoring system for performing the method. By the invention an accelerometer is attached in the center of the rotating hub of a wind turbine and thereby measuring the vibrations of the hub. To extract the vibration signals originating from each blade, the vibration signals are combined with the measuring signals from the azimuth angle sensor (rotating angle), which is normally used for pitch control. Alternatively the azimuth angle is found by using the measured accelerations in two directions representing the centrifugal forces and vibrative forces of the hub in these directions and feeding these signals into a phase locked loop (PLL) unit which establishes a phase of the rotating hub representing the azimuth angle. To further extract each blade frequency a Fast Fourier Transformation (FFT) is used on the signals from the accelerometer. To further monitor a severe and alarming change in each blade frequency each blade frequency is compared to the other blade frequencies and an alarm is set if a given level is reached and the wind turbine is stopped.
    • 本发明涉及一种用于监视风力涡轮机的叶片频率的方法和用于执行该方法的监视系统。 通过本发明,加速度计附接在风力涡轮机的旋转轮毂的中心,从而测量轮毂的振动。 为了提取源自每个叶片的振动信号,振动信号与通常用于俯仰控制的方位角传感器(旋转角度)的测量信号组合。 或者,通过使用表示轮毂在这些方向上的离心力和振动力的两个方向上测量的加速度来找到方位角,并将这些信号馈送到锁相环(PLL)单元中,该单元确定了旋转轮毂的相位, 方位角。 为了进一步提取每个叶片频率,对来自加速度计的信号使用快速傅里叶变换(FFT)。 为了进一步监测每个叶片频率的严重和令人震惊的变化,每个叶片频率与其他叶片频率进行比较,并且如果达到给定水平并且风力涡轮机停止,则设置报警。