Influence of Flexible Generation Mode on the Stability of Hydropower Generation System: Stability Assessment of Part-Load Operation

Gongcheng Liu, Xudi Qiu, Jiayi Ma, Diyi Chen and Xiao Liang
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Gongcheng Liu: Institute of Water Resource and Hydropower Research, Northwest A&F University, Yangling, Xianyang 712100, China
Xudi Qiu: Institute of Water Resource and Hydropower Research, Northwest A&F University, Yangling, Xianyang 712100, China
Jiayi Ma: Institute of Water Resource and Hydropower Research, Northwest A&F University, Yangling, Xianyang 712100, China
Diyi Chen: Institute of Water Resource and Hydropower Research, Northwest A&F University, Yangling, Xianyang 712100, China
Xiao Liang: Institute of Water Resource and Hydropower Research, Northwest A&F University, Yangling, Xianyang 712100, China

Energies, 2022, vol. 15, issue 11, 1-19

Abstract: 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.

Keywords: hydropower generation system; flexible operation; part-load condition; pressure fluctuation; shafting vibration (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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