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research-article

Vibration Characteristics of the Hydroelectric Generating Systems during Load Rejection Transient Process

[+] Author and Article Information
Bingqian Guo

Institute of Water Resources and Hydropower Research, Northwest A&F University, Shaanxi Yangling 712100, P. R. China; Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Shaanxi Yangling 712100, P. R. China
bingqianguo@nwsuaf.edu.cn

Beibei Xu

Institute of Water Resources and Hydropower Research, Northwest A&F University, Shaanxi Yangling 712100, P. R. China; Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Shaanxi Yangling 712100, P. R. China
xubeibei0413@163.com

Diyi Chen

Institute of Water Resources and Hydropower Research, Northwest A&F University, Shaanxi Yangling 712100, P. R. China; Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Shaanxi Yangling 712100, P. R. China; Australasian Joint Research Centre for Building Information Modelling, School of Built Environment, Curtin University, WA, 6102, Australia
diyichen@nwsuaf.edu.cn

Wei Ye

Institute of Water Resources and Hydropower Research, Northwest A&F University, Shaanxi Yangling 712100, P. R. China; Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Shaanxi Yangling 712100, P. R. China
497898457@qq.com

Huanhuan Li

Institute of Water Resources and Hydropower Research, Northwest A&F University, Shaanxi Yangling 712100, P. R. China; Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Shaanxi Yangling 712100, P. R. China
huanhuanli@nwsuaf.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4043361 History: Received September 12, 2018; Revised March 27, 2019

Abstract

Shaft Vibration has always been a challenge problem in affecting the stability of a hydroelectric generating system (HGS). The mechanical vibration characteristics of HGS are investigated during the load rejection transient process in this study. First, a novel nonlinear model of HGS, considering the interaction effect of shafting system expressed by 2 DOF model and pressure pulsation in the penstock modelled by Method of Characteristics, is established. The proposed model is validated by comparing the simulation results with experimental data of a hydropower station in China. The characteristics of the radial vibration as a typical vibration index of unit shafting is carried out during the rejection process to investigate the stability of the HGS. It is experimentally shown that the reasonable increase of the excretion coefficient in runner inlet s1, initial position angle of blade a0, up guide bearing k1 and mass of the generator rotor m1 decrease shafting vibration, and decreasing the eccentricity e appropriately can effectively reduce shafting vibration, thereby the corresponding scheme of vibration reduction is provided to control the vibration of the HGS. Finally, these results provide a useful reference for the safety evaluation and structural reliability prediction of hydropower station system.

Copyright (c) 2019 by ASME
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