Hydro Unit Active Power Controller Minimizing Water Hammer Effect

2020 ◽  
Author(s):  
Yury Kazantsev ◽  
Gleb Glazyrin ◽  
Sergey Shayuk ◽  
Daria Tanfilyeva ◽  
Oleg Tanfilyev ◽  
...  
Keyword(s):  
Water Hammer ◽  
Active Power ◽  
Power Controller ◽  
Water Hammer Effect

Analytic estimation of the impact pressure in a beam-tube due to water-hammer effect

2013 ◽  
Vol 50 (12) ◽  
pp. 1139-1149 ◽  
Author(s):  
Namgyun Jeong ◽  
Daeyoung Chi ◽  
Juhyeon Yoon
Keyword(s):  
Water Hammer ◽  
Impact Pressure ◽  
Beam Tube ◽  
The Impact ◽  
Water Hammer Effect ◽  
Analytic Estimation

scholarly journals Resonance overvoltage control algorithms in long cable frequency conversion drive based on discrete mathematics

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 408-418
Author(s):  
Yonghong Deng ◽  
Quanzhu Zhang
Keyword(s):  
Mathematical Model ◽  
Control Strategy ◽  
Frequency Conversion ◽  
Balance Control ◽  
Frequency Converter ◽  
Active Power ◽  
Drive System ◽  
Discrete Mathematics ◽  
Power Controller ◽  
Capacitor Voltage

AbstractIn order to solve the problem that the long cable variable voltage and variable frequency (VVVF) system does not adopt an effective capacitor voltage sharing control method, resulting in a poor effect of resonance overvoltage control, the resonance overvoltage control algorithm of the long cable VVVF system based on discrete mathematics is studied. First, the long cable frequency conversion drive system is established. In order to ensure voltage loss in the range of motor requirements, a frequency converter–cable–motor (ICM) system connection mode is used to maintain the system operation. Based on the research of the capacitor voltage balance control strategy of a long cable frequency conversion drive system, the discrete mathematical model of the AC side of the ICM system is established by using this control strategy. The improved constant active power controller is obtained by establishing the mathematical model, and the resonant overvoltage in a long cable frequency conversion drive is realized by using the constant active power controller. The experimental results show that the algorithm can effectively control the resonance overvoltage phenomenon in the long cable frequency control system, and the control accuracy is over 97%. It has good performance and can be applied in practice.

scholarly journals A New Active Power Controller in Dual Active Bridge DC-DC Converter with a Minimum-Current-Point-Tracking Technique

2020 ◽  
pp. 1-1
Author(s):  
Osama M. Hebala ◽  
Ahmed A. Aboushady ◽  
Khaled H. Ahmed ◽  
Ibrahim Abdelsalam ◽  
Samuel J. Burgess
Keyword(s):  
Active Power ◽  
Power Controller ◽  
Tracking Technique ◽  
Dual Active Bridge ◽  
Point Tracking ◽  
Current Point

Hydraulic descaling improvement, findings of jet structure on water hammer effect

2007 ◽  
Vol 104 (2) ◽  
pp. 84-90 ◽  
Author(s):  
M. Raudensky ◽  
A. Horak ◽  
J. Horsky ◽  
M. Pohanka ◽  
P. Kotrbacek
Keyword(s):  
Water Hammer ◽  
Jet Structure ◽  
Water Hammer Effect

New Designs in Fuel Dispensing System to Reduce Water Hammer

2013 ◽  
Author(s):  
Y. J. Liu ◽  
Z. Y. Wang ◽  
Z. Y. Huang ◽  
J. Lumkes
Keyword(s):  
Working Conditions ◽  
Rate Control ◽  
Water Hammer ◽  
Service Station ◽  
Start Up ◽  
Flow Rate Control ◽  
The Impact ◽  
Water Hammer Effect ◽  
Rapid Pressure ◽  
Nozzle Structure

Dispensers are used for refueling vehicles at the service station. During the refueling process, the velocity of fluid changes rapidly in several working conditions, which results in a rapid pressure increasing or a water hammer effect occurring. Water hammer, often causes leakage or failure of dispensers, occurs due to pump start-up and shut-down, valves opening or closing during the refueling process. This paper experimentally characterized and theoretically calculated the impact of water hammer on the dispensers at the service station. New designs of nozzle structure and new flow-rate control modes are made to reduce the water hammer in the fuel dispensing system. Eventually, all the water hammers are reduced significantly during the refueling process under the new design modes.

Applying PID control strategy for preventing damage caused by Water Hammer effect in an experimental hydraulic pumping system

2015 ◽  
Author(s):  
Erick Melo Rocha ◽  
Ábner César Santos Bezerra ◽  
Walter Barra Junior ◽  
José Augusto Lima Barreiros
Keyword(s):  
Control Strategy ◽  
Pid Control ◽  
Water Hammer ◽  
Pumping System ◽  
Water Hammer Effect

Enlargement of basilar artery aneurysms following balloon occlusion — “water-hammer effect”

1991 ◽  
Vol 75 (6) ◽  
pp. 963-968 ◽  
Author(s):  
Eddie S. K. Kwan ◽  
Carl B. Heilman ◽  
William A. Shucart ◽  
Richard P. Klucznik
Keyword(s):  
Basilar Artery ◽  
Water Hammer ◽  
Balloon Occlusion ◽  
Successful Therapy ◽  
Content Type ◽  
Aneurysm Neck ◽  
Water Hammer Effect ◽  
Fine Print

✓ Two patients with distal basilar aneurysms were treated with intra-aneurysmal balloon occlusion. After apparently successful therapy, follow-up angiograms demonstrated aneurysm enlargement with balloon migration distally in the sac. Geometric mismatch between the base of the balloons and the aneurysm neck together with transmitted pulsation through the 2-hydroxyl-ethylmethacrylate (HEMA)-filled balloon directly contributed to aneurysm enlargement. In this report, the authors discuss the problems of progressive aneurysm enlargement due to a “water-hammer effect” and the possibility of hemorrhage following subtotal occlusion.

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