scholarly journals Critical stable sectional area of downstream surge tank of hydropower plant with sloping ceiling tailrace tunnel

2021 ◽  
Author(s):  
Wencheng Guo ◽  
Daoyi Zhu
Keyword(s):  
Hydropower Plant ◽  
Sectional Area ◽  
Surge Tank ◽  
Tailrace Tunnel

scholarly journals A Review of Critical Stable Sectional Areas for the Surge Tanks of Hydropower Stations

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6466
Author(s):  
Wencheng Guo ◽  
Yang Liu ◽  
Fangle Qu ◽  
Xinyu Xu
Keyword(s):  
Electrical Coupling ◽  
Stable State ◽  
Future Research ◽  
Regulation System ◽  
Engineering Practice ◽  
Sectional Area ◽  
Surge Tank ◽  
Power Stations ◽  
Pumped Storage ◽  
Hydropower Stations

The critical stable sectional area (CSSA) for surge tanks corresponds to the critical stable state of hydropower stations and is an important index to evaluate the stability of the turbine regulation system. The research on CSSA for surge tanks is always one of the most important topics in the area of transient processes of hydropower stations. The CSSA for surge tanks provides the value basis for the sectional area of surge tanks. In engineering practice, the CSSA for surge tanks is widely used to guide their hydraulic design. This paper provides a systematic literature review about the CSSA for surge tank of hydropower stations. Firstly, the CSSA for surge tanks based on hydraulic transients is discussed. Secondly, the CSSA for surge tanks based on hydraulic-mechanical-electrical coupling transients is presented. Thirdly, the CSSA for air cushion surge tanks is illustrated. Finally, the CSSA for combined surge tanks, i.e., upstream and downstream double surge tanks and upstream series double surge tanks, is presented. In future research, the CSSA for surge tanks of pumped storage power stations should be explored. The CSSA for surge tanks considering multi-energy complement is worth studying.

Tailrace surge shaft optimization procedure for minimum downsurge

2018 ◽  
Vol 45 (6) ◽  
pp. 446-457
Author(s):  
Satyajeet Sinha
Keyword(s):  
Optimization Procedure ◽  
Water Velocity ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Tailrace Tunnel ◽  
The Cross ◽  
The Cost ◽  
Low Pressures ◽  
The Relationship

Tailrace surge shafts are required in hydropower projects where the spent water is conveyed through a long tailrace tunnel under pressure to the recipient. Startup and shutdown of the turbine can cause sudden changes in water velocity and can develop dangerously high and low pressures. Surge shafts are provided in water conductor systems to significantly reduce these pressure surges. Based on numerous transient analyses carried out, it was observed that the cross-sectional area of the tailrace surge shaft can be optimized based on the relationship between the differences in the tailwater level and the minimum downsurge level at the tailrace surge shaft obtained with respect to the different lengths of the tailrace tunnel and different cross-sectional areas of the tailrace surge shaft. In this study, a procedure was proposed by which the tailrace surge shafts can be optimized and, hence, the cost of the hydropower projects with tailrace surge shafts can be minimized.

Setting condition of downstream surge tank of hydropower station with sloping ceiling tailrace tunnel

2020 ◽  
Vol 134 ◽  
pp. 109698 ◽  
Author(s):  
Wencheng Guo ◽  
Daoyi Zhu
Keyword(s):  
Hydropower Station ◽  
Surge Tank ◽  
Tailrace Tunnel

Experimental and numerical investigation on head losses of a complex throttled surge tank for refined hydropower plant simulation

2022 ◽  
Author(s):  
Weichao Ma ◽  
Wenjie Yan ◽  
Jiebin Yang ◽  
Xianghui He ◽  
Jiandong Yang ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Hydropower Plant ◽  
Surge Tank ◽  
Head Losses ◽  
Plant Simulation

Free surface-pressurized flow in ceiling-sloping tailrace tunnel of hydropower plant: simulation by VOF model

2007 ◽  
Vol 45 (1) ◽  
pp. 88-99 ◽  
Author(s):  
Yongguang Cheng ◽  
Jinping Li ◽  
Jiandong Yang
Keyword(s):  
Free Surface ◽  
Hydropower Plant ◽  
Vof Model ◽  
Tailrace Tunnel ◽  
Plant Simulation

scholarly journals A Study of the Location of the Entrance of a Fishway in a Regulated River with CFD and ADCP

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Anders G. Andersson ◽  
Dan-Erik Lindberg ◽  
Elianne M. Lindmark ◽  
Kjell Leonardsson ◽  
Patrik Andreasson ◽  
...  
Keyword(s):  
Acoustic Doppler Current Profiler ◽  
Field Measurements ◽  
Fish Passage ◽  
Hydropower Plant ◽  
Regulated River ◽  
Unstable Flow ◽  
River Bed ◽  
Current Profiler ◽  
Tailrace Tunnel ◽  
Made In

Simulation-driven design with computational fluid dynamics has been used to evaluate the flow downstream of a hydropower plant with regards to upstream migrating fish. Field measurements with an Acoustic Doppler Current Profiler were performed, and the measurements were used to validate the simulations. The measurements indicate a more unstable flow than the simulations, and the tailrace jet from the turbines is stronger in the simulations. A fishway entrance was included in the simulations, and the subsequent attraction water was evaluated for two positions and two angles of the entrance at different turbine discharges. Results show that both positions are viable and that a position where the flow from the fishway does not have to compete with the flow from the power plant will generate superior attraction water. Simulations were also performed for further downstream where the flow from the turbines meets the old river bed which is the current fish passage for upstream migrating fish. A modification of the old river bed was made in the model as one scenario to generate better attraction water. This considerably increases the attraction water although it cannot compete with the flow from the tailrace tunnel.

The Application of Safety Membranes in Hydropower Plant

2014 ◽  
Vol 607 ◽  
pp. 449-453
Author(s):  
Sheng Chen ◽  
Jian Zhang ◽  
Xiao Dong Yu
Keyword(s):  
Hydropower Plant ◽  
Mechanical Device ◽  
Surge Tank ◽  
Small Hydropower ◽  
Membrane Rupture ◽  
Rupture Pressure ◽  
Hydropower Stations ◽  
The Mathematical Model ◽  
Rupture Behavior

Safety membrane is a good mechanical device that can be applied in middle and small hydropower stations instead of a surge tank. This present study deals with the determination of three most important parameters of safety membrane, rupture pressure, diameter, and number. The mathematical model of transient process is established by introducing the method of characteristic, which is used for the simulation of the rupture behavior of safety membrane. Then the model is applied to a specific hydropower station that only can employ safety membrane as the regulating measurement, and it shows good performance. The achievements of the study can serve as a reference for similar projects.

scholarly journals Frequency Containment Control of Hydropower Plants Using Different Adaptive Methods

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2082
Author(s):  
Doğan Gezer ◽  
Yiğit Taşcıoğlu ◽  
Kutay Çelebioğlu
Keyword(s):  
Adaptive Control ◽  
Power Plants ◽  
Lyapunov Method ◽  
Renewable Energy Sources ◽  
Real Life ◽  
Hydropower Plant ◽  
Massachusetts Institute Of Technology ◽  
Surge Tank ◽  
Containment Control ◽  
Hydropower Plants

With the growth in the share of variable renewable energy sources, fluctuations in the power generation caused by these types of power plants can diminish the stability and flexibility of the grid. These two can be enhanced by applying frequency containment using hydropower plants as an operational reserve. The frequency containment in hydropower plants is automatically controlled by speed governors within seconds. Disturbances such as fluctuations in the net head and aging may diminish the performance of the controllers of the speed governors. In this study, model reference adaptive control approaches based on the Massachusetts Institute of Technology (MIT) rule and Lyapunov method were exploited in order to improve the performance of the speed governor for frequency containment control. The active power control with frequency control was enhanced by the aforementioned adaptive control methods. A mathematical model of a hydropower plant with a surge tank and medium penstock was constructed and validated through site measurements of a plant. It was shown that, as they are applicable in real life, both methods perform significantly better compared to conventional proportional-integrator control. Even in first five deviations, the performance of the conventional controller improved by 58.8% using the MIT rule and by 65.9% using the Lyapunov method. When the two adaptive control approaches were compared with each other, the MIT rule outputted better results than the Lyapunov method when the disturbance frequency was higher; however, the latter was more functional for rare disturbances.

scholarly journals Governor Design for a Hydropower Plant with an Upstream Surge Tank by GA-Based Fuzzy Reduced-Order Sliding Mode

Energies ◽  
2015 ◽  
Vol 8 (12) ◽  
pp. 13442-13457 ◽  
Author(s):  
Chang Xu ◽  
Dianwei Qian
Keyword(s):  
Sliding Mode ◽  
Hydropower Plant ◽  
Surge Tank ◽  
Reduced Order
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