Analyse For Vibration Of Water Turbine Based On Fractal Theory

Hydroelectricity is one important part of energy production.It has many characteristics such as quick start-up,low operation outlay and low pollution.As one kind of renewable natural resource,hydroelectricity is already regarded as the object which has priority to development.With economy development,in order to gain the better economic efficiency,the highly effective and the stable operation are the target of all kinds of hydro station.In the operation of hydropower station,the vibration of electric generating set of water turbine is one of the important factors impacting stable operation,so it is necessary to find a advanced technology of diagnosing the type of hydraulic vibration.The paper applies the fractal theory,which is a very active branch in nonlinear science,in diagnosing the type of hydraulic vibration,and gets some results.The vital significance of studying on the diagnosis of hydraulic power unit vibration of water turbine is elaborated,the analysis of its present situation and the development tendency is put forward,and introduce of the fractal theory is involved in this article.Then two methods of intelligent calculation are introduced——artificial neural net work and support vector machine apply to analysis on pressure fluctuation in draft tube of water turbine.In view of analysis methods are less now,the paper puts forward a new analysis method——correlation dimension calculation method of fractal theory.And compiled Matlab application program.The method is applied in analyzing on pressure fluctuation of draft turbine of Huangbizhuang power station's16 MW unit and on pressure fluctuation of upper case of Wanjiazhai power station's 200 MW.It is approved that correlation dimensions are different in different work condition.