Research On Torsion Vibration Water Turbine Generator Unit

As China's water conservancy and hydropower cause of the vigorous development of the installed capacity of hydropower stations increasingly, in the proportion of power grid has increased, unit vibration problems are more and more attention. The impact of vibration unit consists of three main factors: hydraulic vibration, mechanical vibration, electromagnetic vibration. In particular, is difficult to control the hydraulic vibration, often because of the low-frequency eddy tail pipes with a substantial unit of output swing so that the unit sent to the AC grid. In this paper, the Ming Tombs with pumped-storage power station unit-axis system, the crew reverse the vibration characteristics of the targeted research, and contribute to swing the unit conducted a preliminary study. In particular, the major research areas include the following aspects:1. ANSYS as a platform to build two hydro-generator group axis system model. Two models of different points of the rotor arm and the simulation of electromagnetic torque. Spring is a simulation of a rotor arm stiffness, electromagnetic torque will be simplified into a flexible binding, as a corner and linear displacement of the load (a model) and another model is used rotor arm stiffness Leung Unit simulation, simulation of electromagnetic force to load them into the ends of the rotor magnetic pole, that is to simulate a nonlinear load (model).2. To a model for the study, the axis of the unit system to reverse the natural frequency sensitivity and self-analysis. In the natural sensitivity analysis to consider the impact of three different factors: the rotor moment of inertia, the water wheel attached to the moment of inertia and rotor arm stiffness. According to the results found that the relevant laws, designed to provide reference unit.3. Is still a model for the study, in the turbine runner torque under the unit system to reverse shaft vibration analysis. Obtained through analysis of relevant axis system in the turbine runner of the vibration characteristics of torque come in different units of different frequency and load factors under the laws of response.4. On the model for the study, taking into account the electromagnetic force and torque under the turbine runner for the crew to reverse shaft vibration analysis. In the analysis, because of electromagnetic force is the corner of the trigonometric function, the use of ANSYS in the secondary development of language APDL nonlinear loads analysis. To load Non-linear analysis provided a method of analysis, but also contribute to swing analysis unit to provide a new way to explore.