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

Yixuan Guo, Xiao Liang, Ziyu Niu, Zezhou Cao, Liuwei Lei, Hualin Xiong and Diyi Chen
Additional contact information
Yixuan Guo: Institute of Water Resources and Hydropower Research, Northwest A&F University, Xianyang 712100, China
Xiao Liang: Institute of Water Resources and Hydropower Research, Northwest A&F University, Xianyang 712100, China
Ziyu Niu: Institute of Water Resources and Hydropower Research, Northwest A&F University, Xianyang 712100, China
Zezhou Cao: Institute of Water Resources and Hydropower Research, Northwest A&F University, Xianyang 712100, China
Liuwei Lei: Institute of Water Resources and Hydropower Research, Northwest A&F University, Xianyang 712100, China
Hualin Xiong: Institute of Water Resources and Hydropower Research, Northwest A&F University, Xianyang 712100, China
Diyi Chen: Institute of Water Resources and Hydropower Research, Northwest A&F University, Xianyang 712100, China

Energies, 2021, vol. 14, issue 21, 1-21

Abstract: 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.

Keywords: hydroelectric generating system; sudden load increasing process; hydraulic-mechanical-electric parameters; nonlinear dynamics; vibration characteristics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/14/21/7319/pdf (application/pdf)
https://www.mdpi.com/1996-1073/14/21/7319/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:14:y:2021:i:21:p:7319-:d:671992

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().