Abstract
Influenced by hydraulic, mechanical and electrical excitations during transient process, the vibration of a hydraulic generating set and its plant structure may become extremely extrusive, however, currently the related theoretical investigation obviously falls behind the practical engineering, which restricts the way in pursuit of reasonable control method and technology to further improve the non-stable oscillation problem for the structure.Taking the construction of one of the core hydraulic vibration sources, that is, the pressure fluctuation of draft tube, as the entry point, a mathematical expression for the hydraulic excitation induced by the eccentric vortex of draft tube under different load conditions was proposed in the theoretical analysis.Based on an existing hydraulic-mechanical-electrical-structural model for hydroelectric generation systems, the sudden load-up was integrated into the unit-plant vibration, system and the corresponding dynamic properties was investigated.It is shown from the results that, as compared with the case of stable running, the stability of all guide bearings decreases and the matching vibration amplitude notably increases when the system is operated in transient process.Meanwhile, in contrast with the unit shaft system, the oscillation of the generator floor is more dramatic, especially the vertical vibration appears abnormally prominent with a displacement amplification by several times of that under stable operation.The results can provide a reasonable and reliable model and method to the dynamic response analysis of the hydropower unit-plant structure under sudden load transition condition.
Key words
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hydropower station；unit-plant structure；pressure fluctuation of draft tube；load-up process；transient vibration
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WU Qianqian1，ZHANG Leike2,3,MA Zhenyue4，WANG Xueni2.
Vibration characteristics of the unit-plant structure of a hydropower station under transient load-up process[J]. Journal of Vibration and Shock, 2019, 38(18): 53-61
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