华电技术 ›› 2018, Vol. 40 ›› Issue (6): 1-6.

• 研究与开发 •    下一篇

变速恒频风力机叶轮不平衡故障仿真研究

  

  1. 华北电力大学控制与计算机工程学院,北京〓102206
  • 出版日期:2018-06-25 发布日期:2018-08-21

Simulation research on imbalance fault in the rotor of variablespeed constantfrequency wind turbine

  1. School of Control and Computer Engineering,North China Electric Power University,Beijing 102206, China
  • Online:2018-06-25 Published:2018-08-21

摘要:

由于目前基于振动信号的风力机叶轮不平衡故障诊断方法具有传感器多、成本高、可靠性差等缺点。利用Matlab与Simulink分别建立正常和不平衡状态下的机组模型。以某风场实测秒级数据作为系统输入,得到机组输出功率。频域分析表明,风力机输出功率在不平衡故障下包含叶轮旋转1倍频分量,经经验模态分解(EMD)后,输出功率在不同频带内能量值发生改变。以计算输出功率1倍频幅值与EMD能量熵作为故障特征,利用数值拟合法,得到故障程度与两故障特征的关系曲线,实现在无高成本传感器条件下叶轮不平衡故障的监测与诊断。

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Abstract:

There are disadvantages in the diagnotic method of wind rotor imbalance fault based on the vibration signal, which are in great demands for sensors, of high cost and poor reliability. Matlab and Simulink are used to build the models of units under normal and unbalanced conditions respectively. Taken the second wind speed data measured in a real wind farm as simulation input, output power is obtained. Results of frequency domain analysis indicates that output power signals of wind rotor includes first frequency component during imbalance fault. After empirical mode decomposition (EMD), output power contains different energy values in different frequency bands. The amplitude of first frequency component and the EMD energy entropies are used as the evidence of fault. Relationship between fault severity and two evidences mentioned above are obtained by numerical fitting ,which realizes the fault diagnosis without requirements for expensive sensors.

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