Dynamic Safety Assessment in Nonlinear Hydropower Generation Systems

Shuang Li,Yong Yang,Qing Xia

doi:10.1155/2018/5369253

Shuang Li, Yong Yang + Show 1 more

Open Access

https://doi.org/10.1155/2018/5369253

Copy DOI

Journal: Complexity	Publication Date: Jan 1, 2018
Citations: 1	License type: CC BY 4.0

Affiliation: China University of Mining and Technology

Abstract

This paper focuses on the stability problems in a hydropower station. To enable this study, we consider a nonlinear hydropower generation system for the load rejection transient process based on an existing hydropower station. Herein we identify four critical variables of the generation system. Then, we carry out the dynamic safety assessment based on the Fisher discriminant method. The dynamic safety level of the system is determined, and the evolution behavior in the transient process is also performed. The result demonstrates that the hydropower generation system in this study case can operate safely, which is in a good agreement with the corresponding theory and actual engineering. Thus, the framework of dynamic safety assessment aiming at transient processes will not only provide the guidance for safe operation, but also supply the design standard for hydropower stations.

Highlights

Safety problems in hydropower stations generally cause power supply failures, economic loss of plants, and injury of workers [1, 2]
Hydropower generation system (HGS) coupling with hydraulic-mechanical-electrical-magnetic nonlinear structures acts as a core part of a hydropower station, which is connected with the stability of the station [3,4,5,6]
We have presented a dynamic framework of safety assessment of HGSs in transient processes

Summary

Introduction

Safety problems in hydropower stations generally cause power supply failures, economic loss of plants, and injury of workers [1, 2]. Many safety accidents of the HGS occurred in the last thirty years all over the world [7,8,9]. Seventy-five persons lost their lives because of the damage of HGS in Sayano-Shushenskaya hydropower station (Russia) in 2009 [10]. An explosion accident caused by the rotor unbalance of HGS occurred in Huizhou hydropower station (China) in 2008, which resulted in enormous economic loss [11]. It is important to assess the safety level in HGS to improve the stability of hydropower stations

Objectives

Methods

Findings

Conclusion