A life analysis method of pumped storage unit based on hydro-mechanical coupling model

Abstract

The invention discloses a life analysis method of a pumped storage unit based on a hydro-mechanical coupling model, which includes establishing finite element model of a hydro-generator and a water body model of whole flow channel of a pumped storage unit, simulating transient electromagnetic field and transient flow field respectively, obtaining electromagnetic field distribution and electromagnetic force density between stator and rotor air gap of hydro-generator, pressure distribution and velocity distribution in flow field of whole flow channel; transforming the electromagnetic field distribution and electromagnetic force density between stator and rotor air gap, the pressure distribution and velocity distribution in the whole flow field into transient excitation. The transient excitation is applied to the finite element model of pumped storage power station shafting, and the transient dynamics simulation is carried out to obtain the stress-strain nephogram and stress-strain curveof shafting. The fatigue life of the pumped storage unit is calculated by using the load spectrum which is obtained from the statistical analysis of the stress curve. The invention obtains the life analysis result with higher precision and closer to the engineering practice.

Description

technical field [0001] The invention belongs to the technical field of multi-field coupling simulation and life analysis of a pumped storage power station, and more specifically relates to a life analysis method of a pumped storage unit based on a hydromechanical coupling model. Background technique [0002] With the gradual increase of the capacity and size of the generating set, the increase of the water head and the specific speed, the vibration and fatigue life of the generating set are becoming more and more prominent, and the comprehensive analysis of the main shaft and other systems of the hydro-generating set is becoming more and more urgent. The vibration and fatigue problems of hydro-generator units in pumped storage power stations are complex water-mechanical-electrical coupling problems. The fatigue life of each component. [0003] At present, the research on the structural performance of the pumped storage power plant unit is mainly concentrated on the main sha...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a pumped storage unit life analysis method based on the hydromechanical-electrical coupling model, thereby solving the problems in the prior art that are limited by conditions and difficult to realize test measurement and theoretical calculation of stress The accuracy of the method is poor and it cannot consider the multi-field coupling conditions in the actual working conditions, so it is difficult to fit the actual technical problems of the project

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