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research-article

Switched Model and Dynamic Analysis of a Hydro-turbine Governing System in the Process of Load Rejection Transient

[+] Author and Article Information
Huanhuan Li

Institute of Water Resources and Hydropower Research, Northwest A&F University, Shaanxi Yangling 712100, China
huanhuanli012@126.com

Diyi Chen

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

Feifei Wang

Institute of Water Resources and Hydropower Research, Northwest A&F University, Shaanxi Yangling 712100, China
wangfefei1027@126.com

Hao Zhang

Institute of Water Resources and Hydropower Research, Northwest A&F University, Shaanxi Yangling 712100, China
hzhang_pioneer@163.com

1Corresponding author.

ASME doi:10.1115/1.4036234 History: Received August 18, 2016; Revised February 23, 2017

Abstract

In this paper, we pay attention to studying the switched model of the hydro-turbine governing system by introducing the concept of the switching of operational conditions. More specifically, utilizing the data of an existent hydropower station in China, we propose six nonlinear dynamic transfer coefficients of the hydro-turbine which can better describe the dynamic characteristics of the hydro-turbine governing system in the process of load rejection transient. Moreover, the elastic water hammer-impact of the penstock system and the nonlinearity of the generator for the process of load rejection transient are considered. Based on the combination of the different regulation modes of the governor and the corresponding running conditions of the hydroelectric generating unit, a novel nonlinear dynamic switched mathematical model of the hydro-turbine governing system is finally established. Meanwhile, the nonlinear dynamic behaviors of the governing system are exhaustively investigated using numerical simulations. These methods and analytical results will supply some theory bases for running a hydropower station.

Copyright (c) 2017 by ASME
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