vertical axis wind turbine design analysis

... (http://www.youtube.com/watch?v=xWKNMt9rsIA&feature=player_embedded) The Regenedyne Vertical Axis Wind Turbine (VAWT) is revolutionary in design and is far superior to the conventional systems of today The Regenedyne Vertical Axis Wind Turbine (VAWT) can be ... the unique Vertical Axis design of the proposed wind turbines, aesthetics, noise impacts will not be a factor The low profile, new design will be aesthetically pleasing Because the wind turbines ... 10 Mega Watt Vertical Axis Wind Turbines (VAWT) The project site’s 796 acre area can accommodate a total of up to (100) 10 Mw wind turbines See Appendix for additional proposed wind classification...

Ngày tải lên: 01/04/2014, 00:20

... Manwell, McGowan and Rogers [7] describes the analysis of the single stream tube model for a two-dimensional single straight-blade vertical axis wind turbine The geometry of this simple model is ... Stream-tube Model for Studying Vertical Axis Wind Turbines AIAA J of Propulsion and Power Vol 4, pp 370-378, 1988 [7] Manwell J.F., Mcgowan J.G and Rogers A.L Wind Energy Explained Wiley, 2009, ... the following expressions for induction factor a and power coefficient Cp for a single vertical axis wind turbine are obtained [7]: ISSN 2076-2895 (Print), ISSN 2076-2909 (Online) ©2012 International...

Ngày tải lên: 05/09/2013, 17:03

... losses in wind turbine, ρ = air density in kg/m3, A = swept area in m2, Cp =power coefficient of wind turbine, V = wind speed in m/s Mechanical power of wind turbine is directly related to the wind ... MATLAB Modeling of wind turbine The turbine is a wind energy conversion system It consists of an induction generator and other electrical control power requirements The wind turbine is effected ... coefficient [9] λ=ωt×r/V (6) where: r = wind turbine rotor radius, V = wind speed, ωt = mechanical angular rotor speed of the wind turbines Initially, wind speed is not useful until it reach...

Ngày tải lên: 05/09/2013, 16:10

... optimum alpha -design for only one given wind speed, and consequently function at suboptimum levels for any other wind speed The Phase VI wind turbine will be utilized as a starting point design of ... Some wind turbine airfoils are designed to have a high Cl /Cd and at the same time a high Cl for a given alpha -design angle of attack [12] The optimizations of the Cl /Cd for a given alpha -design ... published experimental data [13] for the Phase VI wind turbine performed in the NASA-Ames wind tunnel located in Moffet Field, California The wind turbine consists of 2-blades with 5.03-meter radius...

Ngày tải lên: 09/09/2015, 10:17

... atmospheric ice along a large wind turbine blade and analyses the ice distribution to identify the most affected areas due to icing Numerical setup The NREL MW wind turbine s blade radius used ... angle of the relative wind a= ⎛ cos β ⎞ ⎜1 + ⎜ σ C sin β ⎟ ⎟ r l ⎝ ⎠ σ r Cl ~ (1 − a ) a= 4λ r cos β (3) Blade element momentum theory (BEM) is commonly used in analysis of wind turbine rotors and ... collision efficiency at three different sections of the wind turbine blade Figure Droplet collision efficiency at different sections of NREL MW wind turbine blade 3.2 Atmospheric ice accretion To study...

Ngày tải lên: 05/09/2013, 14:58

... + - - + ∆α i+1 Fig.7: Wind turbine output power without MPPT control method for low wind speed Fig gives the wind turbine output power without MPPT control method at low wind speed In this case, ... low wind speed The use of the MPPT converter imposes a low DC bus voltage to recover the wind energy at the low winds speeds Fig.8: Wind turbine output power with MPPT control method for low wind ... maximum wind power, an analysis was provided to understand the probable displacement of the operating point in the two operating zones of wind turbine Fig 5, represents the typical curve of wind...

Ngày tải lên: 03/01/2014, 19:15

... in the MATLAB/Simulink® software environment A Wind turbine model The wind turbine extracts the wind aero dynamical power The model of the wind turbine uses several inputs to estimate precisely ... ‘Dynamic Behavior of a Class of Wind Turbine Generators during Random Wind Fluctuations’, IEEE Transactions on Power Apparatus and Systems, No June 1981 Z Lubosny Wind Turbine Operation in Electric ... Power coefficient curves for 2kW wind turbine model 10 20 30 40 50 Time [s] 60 70 80 90 100 Fig Typical wind profile The aero dynamical power is described by (1) Pwind = ρAν 3C p (λ, θ) Fig Non-inverting...

Ngày tải lên: 03/01/2014, 19:15

... thereby presenting a more reliable and economical design for wind turbine systems The Fig 12 Output current waveform when the dc voltage is 50V 232 analysis of the working principles, and computer ... simulated for different dc source voltages from 50V to 300V, as if it were from a wind turbine source The inverter is designed for a rated power of kW The grid voltage is fixed at 120V/60Hz The switching ... waveform of the buck-boost inverter under the open loop feedforward compensation control 229 design for wind turbine systems and other distributed generators The two coupled inductors L1 and L2 have...

Ngày tải lên: 03/01/2014, 19:16

Ngày tải lên: 07/03/2014, 01:20

... A: Wind Turbines – Introduction to Wind Energy AA-1 AA.1 Origin of the Wind AA-3 AA.2 Variability of the Wind AA-3 AA.3 Power in the Wind AA-7 AA.4 Wind ... Noise and Vibration by Wind Turbines Wind turbines can produce unwanted sound (referred to as noise) during operation The nature of the sound depends on the design of the wind turbine Propagation ... follows More information on wind turbines may be found in the appendices, particularly in Appendix A 2.1 Wind Turbine Anatomy and Operation Wind turbines utilize the wind, which originates from...

Ngày tải lên: 09/03/2014, 00:20

... (wind = m/s) 20) Lifetime 21) Is the machine self-starting Yes 22) Use of an asynchronous generator Yes 23) Yaw control system 24) Upwind or downwind Wind vane 2 10 Wind speed (m/s) Downwind turbine ... (wind = m/s) 20) Lifetime 21) Is the machine self-starting 22) Use of an asynchronous generator 23) Yaw control system 24) Upwind or downwind Yes 18 12 10 No Wind vane Upwind turbine 11 13 Wind ... power Unit Wind speed (m/s) Power (W) 10 50 0,6 kW 2) Rated wind speed 10 m/s 3) Cut-in wind speed m/s None m/s No limit Km/h 37 kg m 10 m 11 4) Cut-out wind speed 5) Maximum wind speed the turbine...

Ngày tải lên: 24/03/2014, 05:20

Ngày tải lên: 25/03/2014, 12:06

... approximate solving, algorithm design technique Design an algorithm Prove correctness Analyze the algorithm Code the algorithm FIGURE 1.2 Algorithm design and analysis process algorithms in use ... Analysis of Nonrecursive Algorithms Exercises 2.3 2.4 Mathematical Analysis of Recursive Algorithms Exercises 2.4 2.5 Example: Computing the nth Fibonacci Number Exercises 2.5 2.6 Empirical Analysis ... together if they have the same design approach I share the belief of many (e.g., [BaY95]) that this organization is more appropriate for a basic course on the design and analysis of algorithms There...

Ngày tải lên: 29/05/2014, 16:54

... downwind windmill may decide to run upwind This is very difficult to explain, but impressive to watch, when it happens Vertical axis machines We have already looked at one vertical axis wind ... opposite wind turbines' or 'HAWTs' Among theHAWTs, there are the upwind and the downwind varieties, depending on whether the rotor is upwind or downwind of the tower There is another kind known as 'vertical ... compromise Upwind, downwind or vertical axis There are various differenf orientations of rotor you could use (Fig 3.5) Most windmills are what are known as 'horizontal axis Rotor Design 43 Blade...

Ngày tải lên: 04/06/2014, 13:11

... hardly reach as low as zero In addition, it has also been well proven that it is impossible to design a set of codes with ideal impulsive autocorrelation function and ideal zero cross-correlation ... pulse compression sequences, some properties are of particular concern in the optimization for any design in engineering field They are the peak sidelobe level, the energy of autocorrelation sidelobes, ... be called an optimized punctured ZCZ sequence-pair set OPZCZPS(N, K, Z0 ) is an abbreviation 3.2 Design of Optimized Punctured ZCZ Sequence-Pair Set Based on an optimized punctured binary sequence-pair...

Ngày tải lên: 21/06/2014, 17:20

... horizontal and vertical polarization channels at time tk , respectively, then the instantaneous amplitude E(tk ) and the instantaneous polarization angle φ(tk ) (with respect to the vertical) of ... rate is fixed To simplify the analysis, we assume that the delay term t1 is set to zero in both the transmitter and the receiver This simplification will not affect the BER analysis In an additive white ... the vertical polarization antenna and the first mixer to select a particular user If σi2 is the signal power of Vi (t) and Hi (t) corresponding to the ith user, the received signals in the vertically...

Ngày tải lên: 21/06/2014, 23:20

... 14 Bossany, E.A.: ‘The design of closed loop controllers for wind turbines’, Wind Energy, 2000, 3, (3), pp 149–163 15 Wright, A.D.: ‘Modern control design for flexible wind wurbines’ Report no ... induction generator wind turbines’, IEEE trans Power Syst., 2003, 18, (2), pp 803–809 Hansen, A.D., Sorensen, P., Lov, F., Blaabjerg, F.: ‘Control of variable speed wind turbines with doubly-fed ... des1ign for wind turbines-part 1: Control design, implementation, and initial tests’ Report no TP-500-42437, NREL, 2008 Appendix Parameters that are used in the DFIG WT model rating rated wind speed...

Ngày tải lên: 27/06/2014, 16:06

... Vertical- Axis Wind Turbine Mechanical Engineering Department, McMaster University [10] Takao M., Kuma H., Maeda T., Kamada Y., Oki M., Minoda A A Straight-bladed Vertical Axis Wind Turbine with ... carried out in the field of design and analysis of VAWT [2-5] but very few literatures can be found in Wind Turbine Community regarding the CFD approaches in H-Darrieus wind turbines Considerable improvement ... models The interaction of the wind and the blades of the turbine results in the formation of vortices generated both at the upwind and downwind passage near the wind turbine; which is now possible...

Ngày tải lên: 09/09/2015, 10:32

... horizontal axis wind turbine ("Components of a wind turbine, " 2009) Wind turbine manufacturers rarely disclose information about failure modes and failure statistics, therefore literatures on wind turbine ... modes Wind turbines can be categorized based on their working principles, namely aerodynamic drag or aerodynamic lift It can also be categorized into either horizontal axis or vertical axis wind turbine ... 2.1 Configuration of a typical horizontal axis wind turbine ("Components of a wind turbine, " 2009) 10 Figure 2.2 Most frequent reported wind turbine component damage based on insurance...

Ngày tải lên: 09/09/2015, 11:28

... 10 2.2 Throughput Analysis of MAC Protocols 14 2.2.1 Throughput Analysis of Terrestrial MAC Protocols 14 2.2.2 Throughput Analysis of Underwater MAC Protocols ... present new challenges to Medium Access Control (MAC) protocol design In this dissertation, we focus on the design, evaluation, and analysis of handshaking-based MAC protocols By exploiting the ... DESIGN, ANALYSIS, AND PERFORMANCE EVALUATION FOR HANDSHAKING BASED MAC PROTOCOLS IN UNDERWATER ACOUSTIC...

Ngày tải lên: 09/09/2015, 18:49