Demonstration of the high RF power production feasibility in the CLIC power extraction and transfer structure [PETS]

2011 ◽  
Vol 657 (1) ◽  
pp. 78-81 ◽  
Author(s):  
A. Cappelletti ◽  
V. Dolgashev ◽  
J. Lewandoski ◽  
S. Tantawi ◽  
S. Weathersby ◽  
...  
Keyword(s):  
Power Production ◽  
Rf Power ◽  
Power Extraction ◽  
Transfer Structure

scholarly journals High RF power production for CLIC

2007 ◽  
Author(s):  
I. Syratchev ◽  
D. Schulte ◽  
E. Adli ◽  
M. Taborelli
Keyword(s):  
Power Production ◽  
Rf Power

scholarly journals Maximum Power Extraction from Wind Turbines Using a Fault-Tolerant Fractional-Order Nonsingular Terminal Sliding Mode Controller

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5887
Author(s):  
Yashar Mousavi ◽  
Geraint Bevan ◽  
Ibrahim Beklan Küçükdemiral ◽  
Afef Fekih
Keyword(s):  
Fractional Order ◽  
Wind Turbines ◽  
Fault Tolerant ◽  
Sliding Mode ◽  
Power Production ◽  
Maximum Power ◽  
Production Performance ◽  
Terminal Sliding Mode ◽  
Power Extraction ◽  
Nonsingular Terminal Sliding Mode

This work presents a nonlinear control approach to maximise the power extraction of wind energy conversion systems (WECSs) operating below their rated wind speeds. Due to nonlinearities associated with the dynamics of WECSs, the stochastic nature of wind, and the inevitable presence of faults in practice, developing reliable fault-tolerant control strategies to guarantee maximum power production of WECSs has always been considered important. A fault-tolerant fractional-order nonsingular terminal sliding mode control (FNTSMC) strategy to maximize the captured power of wind turbines (WT) subjected to actuator faults is developed. A nonsingular terminal sliding surface is proposed to ensure fast finite-time convergence, whereas the incorporation of fractional calculus in the controller enhances the convergence speed of system states and simultaneously suppresses chattering, resulting in extracted power maximisation by precisely tracking the optimum rotor speed. Closed-loop stability is analysed and validated through the Lyapunov stability criterion. Comparative numerical simulation analysis is carried out on a two-mass WT, and superior power production performance of the proposed method over other methods is demonstrated, both in fault-free and faulty situations.

scholarly journals Energy storage inherent in large tidal turbine farms

2014 ◽  
Vol 470 (2166) ◽  
pp. 20130580 ◽  
Author(s):  
Ross Vennell ◽  
Thomas A. A. Adcock
Keyword(s):  
Energy Storage ◽  
Drag Coefficient ◽  
Tidal Cycle ◽  
Wind Farms ◽  
Power Production ◽  
Flow Speed ◽  
Total Power ◽  
Speed Reduction ◽  
Power Extraction ◽  
Tidal Turbine

While wind farms have no inherent storage to supply power in calm conditions, this paper demonstrates that large tidal turbine farms in channels have short-term energy storage. This storage lies in the inertia of the oscillating flow and can be used to exceed the previously published upper limit for power production by currents in a tidal channel, while simultaneously maintaining stronger currents. Inertial storage exploits the ability of large farms to manipulate the phase of the oscillating currents by varying the farm's drag coefficient. This work shows that by optimizing how a large farm's drag coefficient varies during the tidal cycle it is possible to have some flexibility about when power is produced. This flexibility can be used in many ways, e.g. producing more power, or to better meet short predictable peaks in demand. This flexibility also allows trading total power production off against meeting peak demand, or mitigating the flow speed reduction owing to power extraction. The effectiveness of inertial storage is governed by the frictional time scale relative to either the duration of a half tidal cycle or the duration of a peak in power demand, thus has greater benefits in larger channels.

scholarly journals Design, simulation and performance evaluation of vertical axis helical wind turbine

2019 ◽  
Vol 2 (1) ◽  
pp. 1-13
Author(s):  
Bikash Karki ◽  
Ashok Subedi ◽  
Himal Sigdel ◽  
Pradeep Bartaula
Keyword(s):  
Performance Evaluation ◽  
Aspect Ratio ◽  
Rotor Blade ◽  
Vertical Axis ◽  
Power Production ◽  
Test Rig ◽  
Similar Nature ◽  
Good Source ◽  
Power Extraction ◽  
And Performance

This report is all about the design, simulation, fabrication, and performance evaluation of the VAHWT. The experimental data obtained via testing and data from CFD approach are used for performance evaluation. From the data obtained experimentally, the VAHWT so fabricated has been found to operate at the low cut-in speed of 3.18 m/s and maximum power output has been found to be 2.656 watts at the wind speed of 8 m/s. The maximum rpm of the rotor blade is recorded to be 722.2 rpm at the velocity of 11.53 m/s signifying its potentiality of wind power production. Besides, the data so obtained from both the process when analyzed through graph plots, has shown the similar nature slope wise. This simply signifies the generation of satisfactory data via experiment. In addition, the mechanical losses has shown difference between the experimental and data obtained via CFD approach. At the end, when applying CFD approach for evaluation of maximum efficient turbine varying the aspect ratio, has shown the turbine with aspect ratio of 0.6531 to be the most efficient with performance coefficient of 36.396%. However due to limitation in RPM and Test rig, the rotor blade with aspect ratio of 0.6956 was fabricated and used for evaluation experimentally. The data so obtained from both the process were concluded to be relevant to each other. Thus, the detail study on this project has led to the need and opportunity of VAHWT to be further researched and can be developed as a good source of energy producing system. It can also be economical method of power extraction from wind in the countries like Nepal with growing urbanization.

Sign in / Sign up

Export Citation Format

Share Document