Analysis of the Power Fluctuations Caused by the Unstable Flow in the Trifurcation of Multi-Turbine Diversion Systems with Common Penstock in Hydropower Units

Xinran Guo, Huaiyu Cheng, Hao Wang, Yuanchu Cheng and Mian Sun
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Xinran Guo: The Laboratory of Transients in Hydraulic Machinery, Wuhan University, Wuhan 430072, China
Huaiyu Cheng: School of Power and Mechanical Engineering; Wuhan University, Wuhan 430072, China
Hao Wang: China National Electric Engineering Company, Beijing 100048, China
Yuanchu Cheng: The Laboratory of Transients in Hydraulic Machinery, Wuhan University, Wuhan 430072, China
Mian Sun: China National Electric Engineering Company, Beijing 100048, China

Energies, 2019, vol. 12, issue 15, 1-17

Abstract: Stable operation is a challenge for hydropower stations with multi-turbine hydraulic coupled division systems with a common penstock. In this paper, the serious power fluctuations in a power station with such a division system are analyzed. The fluctuations occur in many conditions without any movement of the regulating system. The mathematical analysis illustrates that pressure fluctuation is responsible for power fluctuations. The computational fluid dynamics (CFD) method provided by ANSYS is used to study the flow pattern in penstocks. The vortex caused by the irrational structure of trifurcation is the reason for pressure fluctuations. Several methods are proposed to optimize the flow stability and three cases are simulated based on these measures. The calculation results of three cases prove the effectiveness of these measures. The measure of setting the new guide plate is finally conducted, and the output power fluctuations vanish. The flow calculation plays a role in the analysis and optimization of the hydraulic system of the hydropower unit. Some rules are summarized from the cases and are helpful in the design of trifurcation in a division system with a common penstock.

Keywords: hydropower station; power output fluctuation; pressure fluctuation; hydraulic coupled effect; common penstock; ANSYS Fluent (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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