Surge wave characteristics for hydropower plant with upstream double surge tanks connected in series under small load disturbance

Yi Liu, Jian Zhang, Zhe Liu, Long Chen and Xiaodong Yu

Renewable Energy, 2022, vol. 186, issue C, 667-676

Abstract: The surge tanks play a crucial role in moderating the oscillation in hydropower plants after load disturbance. Due to the immense flow inertia in extra-long headrace tunnels, hydropower plants with upstream double surge tanks connected in series (UDSTS) are put forward. This paper aims to study surge wave characteristics in surge tanks, which is of great significance for safe operation. Firstly, the mathematic model of UDSTS system coupled with turbine-governor-penstock (TGP) system is established. Then, the analytical formulas for the frequencies of surge waves are derived, and their rationality is verified as well. The generation mechanism and influencing factors of surge waves are investigated. Finally, the guiding suggestions for actual design are proposed. The results indicate that the formulas have great accuracy. The surge waves in double surge tanks are the superposition of two subwaves (i.e. fundamental wave and interharmonic). The fundamental wave is mainly affected by the long headrace tunnel, cross-sectional areas of both surge tanks. The dominant factors of the interharmonic are the short headrace tunnel length, the cross-sectional area of the surge tank near the turbine. The proposed conclusions for surge wave characteristics can provide theoretical reference for practical applications.

Keywords: Surge wave characteristics; Hydropower plants; Upstream double surge tanks connected in series; Small load disturbance; Fundamental wave and interharmonic (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:186:y:2022:i:c:p:667-676

DOI: 10.1016/j.renene.2022.01.004

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