Research on Dynamic Properties of Long Pipeline Monitoring System of Air Cushion Surge Chamber

Ou, Chuanqi; Liu, Deyou; Long-hua, LI

doi:10.1109/appeec.2009.4918683

Cited by 3 publications

(4 citation statements)

References 1 publication

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“…In the paper, it is shown that the mass and momentum balances for air inside the ACST can be further simplified with an ideal gas relation. Other studies include the gas seepage theory for air loss through the ACST chamber in [18], a monitoring method for the hydraulic behavior of the ACST in [19], stability analysis of the ACST in [20], etc. The model developed in most of the previous work assumes an adiabatic process for the cushioning of air inside the ACST.…”

Section: Previous Work and Contributionsmentioning

confidence: 99%

“…The air friction force F D,a modeled using Darcy's friction factor f D inside the ACST of Torpa HPP is considered using Equation ( 12) for the case of water level h ≤ H t , and using Equation (19) for the case of water level h > H t . The input to the turbine with valve signal u v for the simulation purpose is given by u v = 0.5 0 < t ≤ 500 s 0.95 500 s < t ≤ 1500 s where the hydro-turbine is loaded from half-load to nominal load at time t = 500 s. Figure 6 shows hydraulic behavior of the ACST for the turbine loading from 50% to 95%.…”

Section: Effect Of Air Friction Inside Acstmentioning

confidence: 99%

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Mechanistic Model of an Air Cushion Surge Tank for Hydro Power Plants

et al. 2022

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Due to the increasing use of renewable energy sources, and to counter the effects of fossil fuels, renewable dispatchable hydro power can be used for balancing load and generation from intermittent sources (solar and wind). During higher percentage change in load acceptance or rejection in the intermittent grid, the operations of surge tanks are crucial in terms of water mass oscillation and water hammer pressure, and to avoid wear and tear in actuators and other equipment, such as hydro turbines. Surge tanks are broadly classified as open types, with access to open air, and closed types, with a closed volume of pressurized air. Closed surge tanks are considered to have a more flexible operation in terms of suppressing water mass oscillation and water hammer pressure. In this paper, a mechanistic model of an air cushion surge tank (ACST) for hydro power plants is developed based on the ordinary differential equations (ODEs) for mass and momentum balances. The developed mechanistic model of the ACST is a feature extension to an existing open-source hydro power library—OpenHPL. The developed model is validated with experimental data from the Torpa hydro power plant (HPP) in Norway. Results show that the air friction inside the ACST is negligible as compared to the water friction. The results also indicate that a hydro power plant with an ACST is a potential candidate as a flexible hydro power in an interconnected power system grid supplied with intermittent energy sources. Conclusions are drawn based on the simulation results from hydraulic performance of the ACST.

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Section: Previous Work and Contributionsmentioning

confidence: 99%

Section: Effect Of Air Friction Inside Acstmentioning

confidence: 99%

Mechanistic Model of an Air Cushion Surge Tank for Hydro Power Plants

et al. 2022

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“…Dhakal [7] obtained the optimal size of the two-chamber surge chamber by taking the volume and throttle hole of the two-chamber surge chamber as the optimization variables, the surge extreme value and amplitude attenuation rate of the two-chamber surge chamber as the objective function using the non-dominated sorting genetic algorithm NSGA-II algorithm. Ou et al [8] proposed a type of semi-closed ACST body design combining the advantages of open and ACST. Simulation results show that the semi-closed air cushion surge chamber has simple structure and has the advantages of both the hydraulic performance of the surge tank in the transient process of large fluctuations and the rapid convergence of indoor water level in the transition process of small fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Research on Multi-Objective Optimization to the Shape of Air Cushion Surge Tank

Zhang

Huang

Zhou

et al. 2023

J. Phys.: Conf. Ser.

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This paper aims to research on multi-objective optimization to the shape of air cushion surge tank (ACST) in hydropower station. Firstly, a novel nonlinear mathematical model of hydropower station with ACST is established. Then, the analysis of the structure parameter of ACST on hydropower station during transient process is carried out. Furthermore, a multi-objective optimization and decision-making method is applied to determine the shape of ACST. Finally, it is carried out that the comparison analysis by numerical simulation between the optimal parameter and initial parameters of ACST under the checking condition. The results indicate that the impedance hole area, initial gas pressure and cross-sectional area has influence on the transient process index of hydropower station to a certain extent, so they are selected as optimization variables. The hydropower station shows superior dynamic quality under the optimized shape of ACST both in the design condition and in the checking condition. Specifically, the maximum water pressure at the end of volute is reduced by 5.84m and 5.19m respectively, the maximum pressure of air chamber decreases by 2.18m and 1.76m separately, and the extreme water level of ACST goes down by 3.82m and 3.81m solely under design condition and checking condition.

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“…C.Q. Qu et al [4] explained that every control modes have corresponding monitoring systems. PV/T control mode monitors pressure, volume and temperature.…”

Section: Introductionmentioning

confidence: 99%

Study on control mode of operation parameter in hydropower air chamber

Zhang

2018

MATEC Web Conf.

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This paper makes a deep analysis on PL control mode and static water level control mode, which could control operation parameters more conveniently and ensure safety and stability of hydropower water conveyance system. Considering the physical circumstance of monitoring parameters of the air chamber, the mathematic model of air chamber is built. On the basis of two basic criteria which are the maximum pressure at the end of spiral case and the down surge of the air chamber in hydraulic transient process, one hydropower station with air chamber is taken as an example. Determined by the effects of the upper reservoir water level on monitoring parameters, the allowable ranges of PL and air height could be consulted to control actuating and impeding the air compressor and the exhaust valve in an appropriate way. It is put forward that the maximum (minimum) product of the pressure and air height under dynamic initial condition, the maximum (minimum) air height under dynamic initial condition and static initial condition are determined by the criteria of down surge in the air chamber with large volume air (the criteria of the maximum pressure at the end of the spiral case with small volume air).

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Research on Dynamic Properties of Long Pipeline Monitoring System of Air Cushion Surge Chamber

Cited by 3 publications

References 1 publication

Mechanistic Model of an Air Cushion Surge Tank for Hydro Power Plants

Mechanistic Model of an Air Cushion Surge Tank for Hydro Power Plants

Research on Multi-Objective Optimization to the Shape of Air Cushion Surge Tank

Study on control mode of operation parameter in hydropower air chamber

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