Influence Mechanism of Geometric Characteristics of Water Conveyance System on Extreme Water Hammer during Load Rejection in Pumped Storage Plants

Sheng Chen, Jian Zhang, Gaohui Li and Xiaodong Yu
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Sheng Chen: College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
Jian Zhang: College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
Gaohui Li: Powerchina Huadong Engineering Corporation Limited, Hangzhou 311122, China
Xiaodong Yu: College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China

Energies, 2019, vol. 12, issue 15, 1-22

Abstract: Pumped storage plants (PSPs) have achieved rapid development and deployment worldwide since the penetration of intermittent renewable energy sources (RES). Hydraulic transient analysis in the PSP, to obtain the control parameters such as extreme water hammer pressure, is vital to the safe design of water conveyance system. Empirically, simultaneous load rejection (SLR) is commonly accepted as the control condition for extreme water hammer, while it is not completely true for the PSP. Employing theoretical analysis and numerical simulation, this study systematically investigates the effects of geometric characteristics on the extreme water hammer, and reveals the mechanism leading to the maximum spiral case pressure (SCP) during a two-stage load rejection (TLR) process. The results indicate that the extreme water hammer pressure is closely related to geometric characteristics of the water conveyance system, performing the allocation of the water inertia time constant of the main and branch pipelines. When the water inertia time constant in the branch pipe is dominant ( η 1 > 0.24 for example), the maximum SCP will occur in TLR conditions rather than SLR. Moreover, the maximum SCP is almost the same, providing the water inertia time constants of both the main and branch pipelines are kept constant.

Keywords: pumped storage plant; transient analysis; simultaneous load rejection; two-stage load rejection; geometric characteristic; water conveyance system; water inertia time constant (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 (5)

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