Study On Vibration Characteristics Of Water Turbine Generator Set

The operation characteristics of Water Turbine Generator Set mainly include energy, cavitation and stability. Energy is related to extent of water-power utilization; cavitation is related to service life of turbine; the stability not only has great effect to turbine life, but also is directly related to the normal operation of power station. Meanwhile, the vibration of plant structure induced by water-power set has become key problem in designing and operation. The traditional analysis method has good effect in the analysis of vibration signal of power station and damage diagnosis of Water Turbine Generator Set. Fourier transform which is mutual in the analysis of steady signal has limited application in the analysis of unsteady signal. The development of Wavelet analysis has been gradually presenting their advantage and extensive prospect in analysis of measured signal. Based on the actual measurement data of Qingtong-Gorge power station, this paper is aiming to study the vibration characteristics of water-power set with the wavelet decomposing of wavelet analysis theory , wavelet energy entropy and multi-resolution singular spectrum entropy.In chapter 1, general situation, the development and existed conditions of vibration of water-power set are introduced, the new method of signal analysis such as wavelet analysis, information entropy and problems to be solved in this paper are summarized.In chapter 2, according to the measured data of Qingtong -Gorge water-power set, with the application method of traditional Fourier transform, the operation stability of the water-power set is assessed from different angles, thus the factors and the sources that induced the vibration of the water-power set are pointed out according to the analysis result of the measured data.In chapter 3, the development history and the theory of wavelet and information entropy are introduced briefly, then the utility and the development tendency in the signal analysis of the theory of wavelet entropy are summarized.In chapter 4, the measured signal of the components of the water-power set and the throw are analyzed with the application of the theory of wavelet and information entropy theory, thus according to the analysis result above, the vibration signal of Qington-gorge power-set is analyzed and the influence of Qington-gorge power-set draft-tube pulsant pressure on the vibration of power-set is clarified.The content of the chapter 5 is the summary and the prospect, some problems that are needed to be further studied and resolved in this paper are pointed out.