Critical superposition instant of surge waves in surge tank with long headrace tunnel

Yu, Xiaodong; Zhang, Jian; Hazrati, Arash

doi:10.1139/l11-004

Cited by 14 publications

(6 citation statements)

References 12 publications

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“…Minimization of this maximum value is taken as the first objective function in this study. Many researchers have derived empirical or stochastic equations for simplicity in the calculation of the maximum surge head in the surge tank [43][44][45][46], but MOC gives the most accurate results for surge analysis from which the maximum value can be easily obtained.…”

Section: Objective Functionmentioning

confidence: 99%

Numerical Modeling and Hydraulic Optimization of a Surge Tank Using Particle Swarm Optimization

Bhattarai

Zhou

Palikhe

et al. 2019

Water

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In a pressurized water conveyance system, such as a hydropower system, during hydraulic transients, maximum and minimum pressures at various controlling sections are of prime concern for designing a safe and efficient surge tank. Similarly, quick damping of surge waves is also very helpful for the sound functioning of the hydro-mechanical system. Several parameters like diameter of the surge tank, diameter of the orifice, operating discharge, working head, etc., influence the maximum/minimum surge, damping of surge waves in the surge tank, and the difference of maximum pressure head at the bottom tunnel and maximum water level in the surge tank. These transient behaviors are highly conflicting in nature, especially for different diameters of orifices (DO) and diameters of surge tanks (DS). Hence, a proper optimization method is necessary to investigate the best values of DO and DS to enhance the safety and efficiency of the surge tank. In this paper, these variables are accurately determined through numerical analysis of the system by the Method of Characteristics (MOC). Furthermore, the influence on the transient behavior with changing DO and DS is investigated and finally, optimum values of DO and DS are determined using Particle Swarm Optimization (PSO) to minimize the effects of hydraulic transients on the system without compromising the stability and efficiency of the surge tank. The obtained results show significant improvements over the contemporary methods of finding DO and DS for surge tank design.

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Section: Objective Functionmentioning

confidence: 99%

Numerical Modeling and Hydraulic Optimization of a Surge Tank Using Particle Swarm Optimization

Bhattarai

Zhou

Palikhe

et al. 2019

Water

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“…(1) Hydraulic design optimization of surge tanks (1) Surge waves in surge tank, Refs. [14,41,42] Single surge tank, Refs. [51,52] (2) Power-frequency control, Refs.…”

Section: Work Of the Authors' Research Team Work Of Others Around Thementioning

confidence: 99%

“…Due to the great overburden plus the structural stress, the behavior of the rock masses under the high and complex in situ stress field is a key parameter influencing TBM construction [13]. For the throttled surge tank with a long headrace tunnel, superimposed mass oscillation often occurs and affects the safe and stable operation of the hydropower station [14]. In view of the topography and geological setting, the hydropower station with a super long headrace tunnel faces a series of huge technical issues related to the engineering geology and rock mechanics [15], including the safety of the underground caverns, predicting and managing the groundwater, and operation of the TBM under high geo-stresses and high groundwater pressures.…”

Section: Introductionmentioning

confidence: 99%

“…Representative achievements are stated as follows. Yu et al [14,41,42] studied the critical superposition instant of surge waves in surge tanks and the water hammer pressure under successive load rejections for long diversion-type hydropower stations. Martínez-Lucas et al studied the frequency control support of a wind-solar isolated system Energies 2018, 11, 2994 5 of 27 by a hydropower plant with a long tail-race tunnel [43], and analyzed the power-frequency control of hydropower plants with long penstocks in isolated systems with wind generation [44].…”

Section: Introductionmentioning

confidence: 99%

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A Review of the Transient Process and Control for a Hydropower Station with a Super Long Headrace Tunnel

Guo

Zhu

2018

Energies

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The hydropower station with a super long headrace tunnel is a significant development type for hydropower energy. By constructing a super long headrace tunnel, the huge natural water fall head can be utilized to generate more electricity. With the development of hydropower energy, a hydropower station with a super long headrace tunnel becomes more and more competitive. Compared with a hydropower station with a short headrace tunnel, the transient process and control for a hydropower station with a super long headrace tunnel is much more complicated and becomes an intractable challenge. It is well known that the transient process and control is the basis of the design and operation of a hydropower station. To overcome the challenge of the transient process and control, much research has been carried out. This paper provides a systematic review on the latest research progress of the transient process and control for hydropower stations with a super long headrace tunnel. Firstly, two key issues for the transient process and control, i.e., hydraulic design optimization of the surge tank and operation control of unit, are illuminated. Secondly, for both single surge tanks and surge tanks with special types or combinations, the hydraulic design optimization methods are described. The most disadvantageous design and advantageous operation of surge tanks under combined operating conditions are discussed. Thirdly, the stability and regulation quality of the hydro-turbine governing system under isolated and grid-connected operation conditions are presented. Finally, some trends and recommendations for future research directions are made. A research thought for establishing the complete theory and application system of the transient process and control for hydropower stations with a super long headrace tunnel from the perspective of multi-slice and multi-scale is proposed.

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“…In order to reduce the amplitude of water level oscillations in surge tanks and accelerate the attenuation, a new type of differential surge tank [ 15 , 16 ] is designed. However, some undesirable transients may appear because of the complex arrangements and new hydraulic devices [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Transients in the Long Diversion-Type Hydropower Station with a Complex Differential Surge Tank

Zhang

Zhou

2014

The Scientific World Journal

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Based on the theory of hydraulic transients and the method of characteristics (MOC), a mathematic model of the differential surge tank with pressure-reduction orifices (PROs) and overflow weirs for transient calculation is proposed. The numerical model of hydraulic transients is established using the data of a practical hydropower station; and the probable transients are simulated. The results show that successive load rejection is critical for calculating the maximum pressure in spiral case and the maximum rotating speed of runner when the bifurcated pipe is converging under the surge tank in a diversion-type hydropower station; the pressure difference between two sides of breast wall is large during transient conditions, and it would be more serious when simultaneous load rejections happen after load acceptance; the reasonable arrangement of PROs on breast wall can effectively decrease the pressure difference.

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Critical superposition instant of surge waves in surge tank with long headrace tunnel

Cited by 14 publications

References 12 publications

Numerical Modeling and Hydraulic Optimization of a Surge Tank Using Particle Swarm Optimization

Numerical Modeling and Hydraulic Optimization of a Surge Tank Using Particle Swarm Optimization

A Review of the Transient Process and Control for a Hydropower Station with a Super Long Headrace Tunnel

Hydraulic Transients in the Long Diversion-Type Hydropower Station with a Complex Differential Surge Tank

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