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    • 11. 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。
    • 12. 发明申请
    • DAMPING WIND TURBINE TOWER OSCILLATIONS
    • 阻尼风力机塔振荡
    • WO2018077530A1
    • 2018-05-03
    • PCT/EP2017/072968
    • 2017-09-13
    • SIEMENS AKTIENGESELLSCHAFT
    • EGEDAL, Per
    • F03D7/02
    • Damping wind turbine tower oscillations It is described a method for damping a side-side oscillation (5) of a tower (1) of a wind turbine (20) having a generator (29) connected to a converter (33), the method comprising: measuring an acceleration value (51) of the tower (1); determining, based on the acceleration value (51), at least one frequency value (53) of at least one tower oscillation mode, including a second tower oscillation mode; controlling the converter (33) of the wind turbine (20) based at least on the acceleration value (51) and the frequency value (53).
    • 阻尼风力涡轮机塔架振荡描述了一种用于阻尼风力涡轮机(20)的塔架(1)的侧向振荡(5)的方法,该风力涡轮机(20)具有连接到 (33),所述方法包括:测量所述塔架(1)的加速度值(51); 基于加速度值(51)确定至少一个塔式振荡模式的至少一个频率值(53),所述至少一个塔式振荡模式包括第二塔式振荡模式; 至少基于加速度值(51)和频率值(53)来控制风力涡轮机(20)的转换器(33)。
    • 20. 发明授权
    • MONITORING OF BLADE FREQUENCIES OF A WIND TURBINE
    • ÜBERWACHUNGDER SCHAUFELFREQUENZEN EINER WINDTURBINE
    • EP2179337B1
    • 2011-06-29
    • EP08786984.8
    • 2008-08-07
    • Siemens Aktiengesellschaft
    • 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.
    • 提供了一种用于监测风力涡轮机和监视系统的叶片频率的方法。 加速度计连接到测量轮毂振动的风力涡轮机的旋转轮毂上。 为了提取源自每个叶片的振动信号,振动信号与来自方位角传感器的测量信号组合。 或者,通过使用表示毂的离心力和振动力的两个方向上测量的加速度,并将这些信号馈送到建立表示方位角的旋转轮毂的相位的锁相环单元中来找到方位角。 为了提取每个叶片频率,对来自加速度计的信号使用快速傅立叶变换。 为了监测每个叶片频率的严重变化,将每个叶片频率与其他叶片频率进行比较,并且在达到给定水平并且风力涡轮机停止时设置报警。