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基于Volterra模型盲辨识的水轮机转轮状态识别

DOI: 10.13334/j.0258-8013.pcsee.2014.20.020, PP. 3392-3396

Keywords: 水轮机转轮,状态识别,Volterra级数,盲辨识,广义频率响应(GFRF)

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Abstract:

为实现水轮机转轮状态及时有效地识别,运用基于模型的状态识别方法建立水轮机转轮模型,从而提取转轮不同状态下的特征,达到状态识别的目的。鉴于水轮机转轮模型的输入量非常复杂且不易测得的特点,假定水轮机转轮受到的不均匀力作为一个随机输入,利用水导轴承摆度作为输出,提出了基于Volterra模型盲辨识的水轮机转轮状态识别方法。利用在线监测系统中已有的水导轴承摆度数据作为输出,辨识出水轮机转轮Volterra时域模型。结合多维傅里叶responsefunction,GFRF)。通过模型频域上的变化,分析转轮状态的变化。仿真实验和实例研究表明,Volterra模型盲辨识方法能够很好地反映原系统的频域特性,实现了水电机组转轮频域特征的良好提取,进而可采用该方法对水轮机转轮进行状态识别。

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