Vibration Characteristics of a Hydroelectric Generating System with Different Hydraulic-Mechanical-Electric Parameters in a Sudden Load Increasing Process

In a sudden load increasing process (SLIP), the hydroelectric generating system (HGS) experiences a severe vibration response due to the sudden change of the hydraulic-mechanical-electric parameters (HMEPs). The instability of HGS limits the ability of sudden load increase, and its flexibility and r...

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Autores principales:	Yixuan Guo, Xiao Liang, Ziyu Niu, Zezhou Cao, Liuwei Lei, Hualin Xiong, Diyi Chen
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	hydroelectric generating system sudden load increasing process hydraulic-mechanical-electric parameters nonlinear dynamics vibration characteristics Technology T
Acceso en línea:	https://doaj.org/article/f5d53c9ef07a44faa910e0155345397e
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spelling	oai:doaj.org-article:f5d53c9ef07a44faa910e0155345397e2021-11-11T16:02:59ZVibration Characteristics of a Hydroelectric Generating System with Different Hydraulic-Mechanical-Electric Parameters in a Sudden Load Increasing Process10.3390/en142173191996-1073https://doaj.org/article/f5d53c9ef07a44faa910e0155345397e2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7319https://doaj.org/toc/1996-1073In a sudden load increasing process (SLIP), the hydroelectric generating system (HGS) experiences a severe vibration response due to the sudden change of the hydraulic-mechanical-electric parameters (HMEPs). The instability of HGS limits the ability of sudden load increase, and its flexibility and reliability are reduced. Thus, in this study, a new transient nonlinear coupling model of HGS is proposed, which couples the hydro-turbine governing system (HTGS) and the hydro-turbine generator shafting system (HGSS) with the hydraulic-mechanical-electric coupling force, rotating speed, flow rate, hydro-turbine torque, electromagnetic torque, and guide vane opening. By using numerical simulation, the influences of different HMEPs on the vibration characteristics of HGS in SLIP are analyzed. The result shows that, compared with stable operating conditions, the vibration amplitude of HGS increases sharply in SLIP. The increase of the sudden load increasing amount, blade exit flow angle, mass eccentricity and excitation current, and the decrease in guide bearing stiffness and average air gap between the stator and rotor cause abnormal vibration of different degrees in the HGS. Hydraulic factors have the greatest influence on the nonlinear dynamic behavior of HGS. The maximum vibration amplitude of HGS in SLIP is increased by 70.46%, compared with that under stable operating conditions. This study provides reasonable reference for the analysis of the nonlinear dynamic behavior of HGS in SLIP under the multiple vibration sources.Yixuan GuoXiao LiangZiyu NiuZezhou CaoLiuwei LeiHualin XiongDiyi ChenMDPI AGarticlehydroelectric generating systemsudden load increasing processhydraulic-mechanical-electric parametersnonlinear dynamicsvibration characteristicsTechnologyTENEnergies, Vol 14, Iss 7319, p 7319 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hydroelectric generating system sudden load increasing process hydraulic-mechanical-electric parameters nonlinear dynamics vibration characteristics Technology T
spellingShingle	hydroelectric generating system sudden load increasing process hydraulic-mechanical-electric parameters nonlinear dynamics vibration characteristics Technology T Yixuan Guo Xiao Liang Ziyu Niu Zezhou Cao Liuwei Lei Hualin Xiong Diyi Chen Vibration Characteristics of a Hydroelectric Generating System with Different Hydraulic-Mechanical-Electric Parameters in a Sudden Load Increasing Process
description	In a sudden load increasing process (SLIP), the hydroelectric generating system (HGS) experiences a severe vibration response due to the sudden change of the hydraulic-mechanical-electric parameters (HMEPs). The instability of HGS limits the ability of sudden load increase, and its flexibility and reliability are reduced. Thus, in this study, a new transient nonlinear coupling model of HGS is proposed, which couples the hydro-turbine governing system (HTGS) and the hydro-turbine generator shafting system (HGSS) with the hydraulic-mechanical-electric coupling force, rotating speed, flow rate, hydro-turbine torque, electromagnetic torque, and guide vane opening. By using numerical simulation, the influences of different HMEPs on the vibration characteristics of HGS in SLIP are analyzed. The result shows that, compared with stable operating conditions, the vibration amplitude of HGS increases sharply in SLIP. The increase of the sudden load increasing amount, blade exit flow angle, mass eccentricity and excitation current, and the decrease in guide bearing stiffness and average air gap between the stator and rotor cause abnormal vibration of different degrees in the HGS. Hydraulic factors have the greatest influence on the nonlinear dynamic behavior of HGS. The maximum vibration amplitude of HGS in SLIP is increased by 70.46%, compared with that under stable operating conditions. This study provides reasonable reference for the analysis of the nonlinear dynamic behavior of HGS in SLIP under the multiple vibration sources.
format	article
author	Yixuan Guo Xiao Liang Ziyu Niu Zezhou Cao Liuwei Lei Hualin Xiong Diyi Chen
author_facet	Yixuan Guo Xiao Liang Ziyu Niu Zezhou Cao Liuwei Lei Hualin Xiong Diyi Chen
author_sort	Yixuan Guo
title	Vibration Characteristics of a Hydroelectric Generating System with Different Hydraulic-Mechanical-Electric Parameters in a Sudden Load Increasing Process
title_short	Vibration Characteristics of a Hydroelectric Generating System with Different Hydraulic-Mechanical-Electric Parameters in a Sudden Load Increasing Process
title_full	Vibration Characteristics of a Hydroelectric Generating System with Different Hydraulic-Mechanical-Electric Parameters in a Sudden Load Increasing Process
title_fullStr	Vibration Characteristics of a Hydroelectric Generating System with Different Hydraulic-Mechanical-Electric Parameters in a Sudden Load Increasing Process
title_full_unstemmed	Vibration Characteristics of a Hydroelectric Generating System with Different Hydraulic-Mechanical-Electric Parameters in a Sudden Load Increasing Process
title_sort	vibration characteristics of a hydroelectric generating system with different hydraulic-mechanical-electric parameters in a sudden load increasing process
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/f5d53c9ef07a44faa910e0155345397e
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Vibration Characteristics of a Hydroelectric Generating System with Different Hydraulic-Mechanical-Electric Parameters in a Sudden Load Increasing Process

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