Power Stabilization System with Unique Pumped Storage to Stabilize Momentarily Fluctuating Power from Renewable Resources (Counter-Rotating Type Pump Turbine Unit Operated at Turbine Mode)

2014 ◽  
pp. 171-177
Author(s):  
Jin-Hyuk Kim ◽  
Risa Kasahara ◽  
Toru Miyaji ◽  
Toshiaki Kanemoto ◽  
Young-Seok Choi
Keyword(s):  
Renewable Resources ◽  
Turbine Unit ◽  
Stabilization System ◽  
Pump Turbine ◽  
Power Stabilization ◽  
Pumped Storage ◽  
Turbine Mode

Counter-Rotating Type Pump-Turbine Unit Stabilizing Momentarily Fluctuating Power From Renewable Energy Resources

2013 ◽  
Author(s):  
Toshiaki Kanemoto ◽  
Risa Kasahara ◽  
Hirotaka Honda ◽  
Toru Miyaji ◽  
Jin-Hyuk Kim
Keyword(s):  
Renewable Energy ◽  
Power Quality ◽  
Turbine Unit ◽  
Energy Resources ◽  
Stabilization System ◽  
Grid System ◽  
Renewable Energy Resources ◽  
Pump Turbine ◽  
Power Stabilization ◽  
Pumped Storage

It is difficult, for renewable energy resources, to provide constant power with excellent quality for the grid system. This serial research proposes a power stabilization system with a pumped storage to guarantee the power quality and capacity, while the energy resources are at unstable and/or fluctuating conditions. The power stabilization system with the counter-rotating type pump-turbine unit was prepared and operated at the pumping and the turbine modes. The experiments have verified that this type pump-turbine unit is reasonably effective to stabilize momentarily/instantaneously the fluctuating power from the renewable energy resources.

scholarly journals 1015 Power Stabilization System with Counter-Rotating Type Pump Turbine Unit for Renewable Energies

2013 ◽  
Vol 2013 (0) ◽  
pp. _1015-01_-_1015-02_
Author(s):  
Toru MIYAJI ◽  
Risa KASAHARA ◽  
Jin-hyuk KIM ◽  
Toshiaki KANEMOTO
Keyword(s):  
Turbine Unit ◽  
Renewable Energies ◽  
Stabilization System ◽  
Pump Turbine ◽  
Power Stabilization

scholarly journals Power Stabilization System with Counter-Rotating Type Pump-Turbine Unit for Renewable Energy

2014 ◽  
Vol 02 (04) ◽  
pp. 47-52 ◽  
Author(s):  
Toru Miyaji ◽  
Risa Kasahara ◽  
Toshiaki Kanemoto ◽  
Jin-Hyuk Kim ◽  
Young-Seok Choi ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Turbine Unit ◽  
Stabilization System ◽  
Pump Turbine ◽  
Power Stabilization

scholarly journals Multiobjective Optimization of a Counterrotating Type Pump-Turbine Unit Operated at Turbine Mode

2014 ◽  
Vol 6 ◽  
pp. 467235 ◽  
Author(s):  
Jin-Hyuk Kim ◽  
Risa Kasahara ◽  
Toshiaki Kanemoto ◽  
Toru Miyaji ◽  
Young-Seok Choi ◽  
...  
Keyword(s):  
Multiobjective Optimization ◽  
Turbine Unit ◽  
Pump Turbine ◽  
Turbine Mode

128 Power Stabilization System with Counter-Rotating Type Flow Pump-Turbine

2014 ◽  
Vol 2014.67 (0) ◽  
pp. _128-1_-_128-2_
Author(s):  
Hirotaka HONDA ◽  
Risa KASAHARA ◽  
Toru MIYAJI ◽  
Toshiaki KANEMOTO
Keyword(s):  
Stabilization System ◽  
Pump Turbine ◽  
Type Flow ◽  
Power Stabilization ◽  
Flow Pump

scholarly journals Optimized Blade Design of Counter-Rotating-Type Pump-Turbine Unit Operating in Pump and Turbine Modes

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Jin-Woo Kim ◽  
Jun-Won Suh ◽  
Young-Seok Choi ◽  
Kyoung-Yong Lee ◽  
Toshiaki Kanemoto ◽  
...  
Keyword(s):  
Flow Rate ◽  
Turbine Unit ◽  
Stokes Equations ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Latin Hypercube Sampling ◽  
Low Flow ◽  
Pump Turbine ◽  
Design Variables ◽  
Turbine Mode

In this study, a counter-rotating-type pump-turbine unit was optimized to improve the pump and turbine mode efficiencies simultaneously. Numerical analysis was carried out by solving three-dimensional Reynolds-averaged Navier–Stokes equations using the shear stress turbulence model. The hub and tip blade angles of the rear impeller (in the pump mode) were selected as the design variables by conducting a sensitivity test. An optimization process based on steady flow analysis was conducted using a radial basis neural network surrogate model with Latin hypercube sampling. The pump and turbine mode efficiencies of the unit were selected as the objective functions and they combined into a single specific objective function with the weighting factors. Consequently, the pump and turbine mode efficiencies of the optimum design increased simultaneously at overall range of flow rate, except for low flow rate of turbine mode, compared to the reference design.

Numerical Simulation in Turbine Mode of Counter-Rotating Type Axial Flow Pump (Preparation of Pump-Turbine Unit in Cooperation With Wind Power Unit)

2012 ◽  
Author(s):  
Tengen Murakami ◽  
Toshiaki Kanemoto ◽  
Gohki Takano ◽  
Risa Kasahara
Keyword(s):  
Numerical Simulation ◽  
Angular Momentum ◽  
Turbine Unit ◽  
Storage System ◽  
Axial Flow ◽  
Weak Points ◽  
Axial Flow Pump ◽  
Pumped Storage ◽  
Turbine Mode ◽  
Flow Pump

Pumped storage system contributes to adjust the electric power unbalance between day and night, in general. The pumping operation, however, may be unstable in the rising portion of the head characteristics, and/or bring the cavitation at the low suction head. To simultaneously overcome both weak points, the authors have proposed a superior pumping unit that is composed of counter-rotating type impellers and a peculiar motor with double rotational armatures. This paper discusses the operation at the turbine mode of the above unit. It is concluded with the numerical simulations that this type unit can be also operated acceptably at the turbine mode, because the unit works so as to coincide the angular momentum change through the front runners/impellers with that thorough the rear runners/impellers, namely to take the axial flow at not only the inlet but also the outlet without the guide vanes.

Effect of the Speed Factor On the Amplitude of the Blade Passing Frequency in the Vaneless Space of a Pump Turbine in Turbine Mode

2021 ◽  
Author(s):  
Jinhong Hu ◽  
Jiebin Yang ◽  
Wei Zeng ◽  
Jiandong Yang
Keyword(s):  
Strouhal Number ◽  
Goodness Of Fit ◽  
Guide Vane ◽  
Mathematical Relationship ◽  
Pump Turbine ◽  
Speed Factor ◽  
Blade Passing Frequency ◽  
Rotor Stator Interaction ◽  
Pumped Storage ◽  
Turbine Mode

Abstract An exponential expression describing the relationship between the amplitude of the blade passing frequency in the vaneless space of a pump turbine operating in the turbine mode and the speed factor is proposed based on statistical analysis. This mathematical relationship was discovered through signal processing of the data recorded during the emergency load rejection process of a prototype pump turbine. Subsequently, based on the pumped-storage test rig at Wuhan University, an experimental investigation was conducted to verify this mathematical relationship. The results indicated that, under the optimal guide vane opening of the model pump turbine, the goodness of fit of this mathematical relationship was quite high. As for the Francis pump turbine, the speed factor corresponds to the Strouhal number. Therefore, for this correlation, the underlying physical mechanism is the influence of the Strouhal number. This relation could inform the design and operation of pump turbines to control the intensity of pressure pulsations in the vaneless space. In addition, based on this mathematical relationship, the intensity of the rotor-stator interaction for different pump turbines can be compared quantitively.

scholarly journals Turbine mode start-up simulation of a variable speed Francis pump-turbine prototype – Part II: 3-D unsteady CFD and FEM

2021 ◽  
Vol 774 (1) ◽  
pp. 012070
Author(s):  
D. Biner ◽  
S. Alligné ◽  
V. Hasmatuchi ◽  
C. Nicolet ◽  
N. Hugo ◽  
...  
Keyword(s):  
Variable Speed ◽  
Pump Turbine ◽  
Start Up ◽  
Turbine Mode

scholarly journals Pressure Analysis in the Draft Tube of a Pump-Turbine under Steady and Transient Conditions

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4732
Author(s):  
Jing Yang ◽  
Yue Lv ◽  
Dianhai Liu ◽  
Zhengwei Wang
Keyword(s):  
Steady State ◽  
Pressure Pulsation ◽  
Transient Flow ◽  
Draft Tube ◽  
Simulation Method ◽  
Wall Pressure ◽  
Pump Turbine ◽  
Steady State Condition ◽  
Transient Conditions ◽  
Pumped Storage

Pumped-storage power stations play a regulatory role in the power grid through frequent transition processes. The pressure pulsation in the draft tube of the pump-turbine under transient processes is important for safe operation, which is more intense than that in the steady-state condition. However, there is no effective method to obtain the exact pressure in the draft tube in the transient flow field. In this paper, the pressure in the draft tube of a pump-turbine under steady-state and transient conditions are studied by means of CFD. The reliability of the simulation method is verified by comparing the real pressure pulsation data with the test results. Due to the distribution of the pressure pulsation in the draft tube being complex and uneven, the location of the pressure monitoring points directly affects the accurate judgement of cavitation. Eight monitoring surfaces were set in the straight cone of the draft tube and nine monitoring points were set on each monitoring surface to analyze the pressure differences on the wall and inside the center of the draft tube. The relationships between the pressure pulsation value inside the center of the draft tube and on the wall are studied. The “critical” wall pressure pulsation value when cavitation occurs is obtained. This study provides references for judging cavitation occurrences by using the wall pressure pulsation value in practical engineering.

Sign in / Sign up

Export Citation Format

Share Document