期刊
ENERGIES
卷 15, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/en15113956
关键词
hydropower generation system; flexible operation; part-load condition; pressure fluctuation; shafting vibration
资金
- Fundamental Research Funds for Northwest AF University [Z1090220172]
- scientific research foundation of the Natural Science Foundation of Shaanxi Province of China [2019JLP-24]
- Shaanxi Science and Technology Innovation Team
- Water Conservancy Science and Technology Program of Shaanxi Province [2018slkj-9]
This study investigates the stability performance of hydropower generation systems (HGS) during flexible operation. A dynamic model reflecting the characteristics of part-load conditions is established and coupled with a shafting system to investigate unit vibration. The results show that part-load operation leads to dynamic response fluctuations and possible ways to mitigate the instability are explored.
Utilizing the flexibility of hydropower to integrate more intermittent renewable energy into the power grid requires hydro units to expand the operating range; this duty, however, requires a continuous improvement of their stability during part-load conditions. This study focuses on the stability performance of hydropower generation systems (HGS) during flexible operation. First, a dynamic model of HGS that reflects the characteristics of part-load conditions is established by introducing pressure pulsation in the draft tube. Second, the model of HGS is coupled with a shafting system to investigate the vibration property of the unit. Then, the validity of the coupling model is verified by comparing it with a traditional model and actual data. Finally, some possible ways to mitigate the instability caused by part-load operation are explored. The results show that part-load operation of the system is accompanied by significant dynamic response fluctuations (5%). Moreover, the interaction effect of multiple vibration sources and the vibration performance in a part-load condition are investigated. This paper is expected to provide support for improving the stability of HGS part-load operation and offer useful insights for exploiting the flexibility potential of HGS.
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