Stability of pumped storage unit in pump operation mode under hydraulic excitation
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
With a large number of pumped storage units put into operation, the stability problem of the unit caused by hydraulic vibration becomes serious. In this paper, we conducted field tests to obtain the unit vibration and run-out data of pumped storage units running at rated speed in both synchronous-condenser-as-pump (SCP) mode and pump operation (PO) mode. We used the frequency spectrum comparison analysis method to study the frequency spectrum of each measuring point in the two modes, and found differences in the frequency components of different measuring points. The results indicated that the vibration amplitude of the unit parts sustaining vertical load was larger in PO mode than in SCP mode. The 112.5Hz rotor-stator interaction frequency component mainly propagated vertically, and it was attenuated in the propagation. At some measuring points in PO mode, hydraulic interaction added runner blade passing frequency 56.25Hz and rotor-stator interaction frequency 112.5Hz to the frequency components. However, the addition of frequency components did not necessarily cause an increase in the mixed frequency amplitude of unit vibration and run-out. Since high frequencies such as 261Hz emerged in unit vibration, the dynamic analysis report of power houses and units should include higher frequencies in the future. This investigation provided detailed data for the runner research and design engineers.
Keywords:
Project Supported:
Clc Number:
Mobile website
® 2024 All Rights Reserved
冀公网安备13010502002656号
冀公网安备13010502002656号