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Wind turbine rotor acceleration : identification using Gaussian regression

Wind turbine rotor acceleration : identification using Gaussian regression

The measurement data for the wind turbine rotor speed consist of a run of 600 seconds sampled at 40Hz. A typical section, from 200s to 400s, is shown in Figure 3. The data has a long length-scale component due to variations in the aerodynamic torque, caused by changes in the wind speed and the pitch angle of the rotor blades, and a short length- scale component due to the structural and electro- mechanical dynamics of the machine. From Figure 3, these two components can be clearly seen as can the poor quality of the data.

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Application of a Particle Damping Technique on Wind Turbine Rotor by Filling of 90 Percent Balls

Application of a Particle Damping Technique on Wind Turbine Rotor by Filling of 90 Percent Balls

Vibration in wind turbine brings major issues concerning to power generation. Many researchers studied by focusing on vibration of blade. Krenk [01] shows active struts located near the root of every blade for reducing blade vibrations. Duquette [2] investigated structural part is damage at nacelle cover and blades of wind turbine. Dapeng [3] shows edgewise vibration is the main issue in most of the wind turbine blades. Typhoon also creates problem in generating power, Ishizaki [4]. Giguere [5] gives dynamic characteristics of machine as it requires controlling vibration in blade which is necessary, as it adversely affect on electricity generation. Edgewise and flap wise modes of vibration is the main concern in blade according to Thomsen [6]. Khan [7] invented a tuned liquid column damper (TLCD) in a rotating blade. Active tuned mass damper in investigated by Fitzgerald [8] for mitigating edgewise vibrations. Saranyasoontorn [9] investigated extreme wind turbine load using different methods. Murtagh [10] shows the effect of passive damper inserted in turbine tower for suppressing vibration created by wind forces. Multiple tuned mass damper (MTMD) technique is introduced by Hussan [11] for multi-mode vibration suppression of offshore wind turbine considering seismic excitation. Mainly, load acting on the blade is wind load and many scientists have already worked by blade element momentum method (BEM) for calculating aerodynamic load of a blade Sandanshiv [12]. In this research
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CFD analysis on aerodynamic design optimization of wind turbine rotor blade

CFD analysis on aerodynamic design optimization of wind turbine rotor blade

These two aims fulfill with one boundary condition which is use pressure as an inlet condition. The validation of CFD against 2D blade sections showed that the CFD and XFOIL panel code over-predict peak lift and tend to underestimate stalled flow. The 3D results compared well with experiment over four operating conditions. Results from the 3D corresponding calculated torque output showed good agreement with the 3D CFD model and experimental data. However, for high wind cases the actuator model tended to diverge from the CFD results and experiment.

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Experimental Study of Cracking Behaviour for SFRC Beams without Stirrups with Varying A/D Ratio

Experimental Study of Cracking Behaviour for SFRC Beams without Stirrups with Varying A/D Ratio

The art is then to design a winglet, which optimizes drag reduction, maximizes power production and minimizes thrust increase. The resulting pressure difference on an operating wind turbine blade causes inward span wise flow on the suction side and outward span wise flow on the pressure side near the tip. At the trailing edge, vorticity is generated, which is the origin of induced drag. A winglet is a load carrying device that reduces the span wise flow, diffuses and moves the tip vortex away from the rotor plane reducing the downwash and thereby the induced drag on the blade The main purpose of adding a winglet to a wind turbine rotor is to decrease the total drag from the blades and thereby increase the aerodynamic efficiency of the turbine. Reduction of total drag is obtained if the additional drag from the winglet is less than the reduction of the induced drag on the remaining blade.
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Development of a DC AC power conditioner for wind generator by using neural network

Development of a DC AC power conditioner for wind generator by using neural network

As an extension to this work done in (Anderson & Anjan Bose, 1883) and (Wasynczuk et al, 1981) presented a general model that can be used to represent all types of variable speed wind turbines in power system dynamic simulations. The modelling of the wind turbine given by the authors retains the pitch angle controller, which reduces wind turbine rotor efficiency at high wind speeds, as given in (Anderson & Anjan Bose, 1883) and (Wasynczuk, et al, 1981). The wind turbine dynamics are approximated using nonlinear curves, which are numerical approximations, to estimate the value of wind turbine rotor efficiency for given values of rotor tip speed and pitch angle of the blade. The authors offer a comparison between the per-unit power curves of two commercial wind turbines and the one obtained theoretically by using the numerical approximation. The results indicate that a general numerical approximation can be used to simulate different types of wind turbines.
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Numerical Validation of Floating Offshore Wind Turbine Scaled Rotor for Surge Motion

Numerical Validation of Floating Offshore Wind Turbine Scaled Rotor for Surge Motion

codes by comparing with unsteady experimental results of a scaled floating wind turbine rotor.. The 17.[r]

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A Study of Savonius Type Wind Turbines: Its Feasibility in Context to Wind Potential of Guwahati, Assam

A Study of Savonius Type Wind Turbines: Its Feasibility in Context to Wind Potential of Guwahati, Assam

The performance of Savonius rotor wind turbine has been analysed taking into account the practical values of wind speed. The rotor we have considered has a rated capacity of 1.2 Kw. After plotting the values of generated power against the wind speed in fig.1, it was observed that the cut-in speed happens to be around 0.2 m/s with a generated power of 0.022 watt. The maximum power obtained is at a speed of 6.11 m/s and power is 0.636 kW. So it can be noted that at this level of wind speed, without using any gear-box, only half the rated capacity of the turbine can be harnessed. Hence it may be advisable to use gearboxes.
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Comparative  Analysis  of Mechanical  Efficiency of Domestic Hawt without Nosecone and with Nosecone

Comparative  Analysis  of Mechanical  Efficiency of Domestic Hawt without Nosecone and with Nosecone

The demand of electricity is increasing day by day in India Or World. We majorly produce electricity by using the traditional fuel like coal for power production or work doing. As we know, our conventional fuel resources are not ample which is getting reduced day by day. In this condition, wind power can be a very suitable and also low-cost choice for power production. Majorly in remote area the domestic wind turbine or small wind turbine may be used for power production to fulfill the domestic usages. This method of producing power cheaper and requires less maintenance cost than the other sources of power production. Secondly, it is pollution free hence it is ecofriendly and requires low maintenance. The small or technically known as micro wind turbine produces low power even of at lower wind speed. Thus minimum output of power required for lighting can be achieved by this micro wind turbine. LED light induced which gives a momentum to this research work even at lower wind speed and the lighting work has been achieved efficiently. The objective of our this research work is to compare mechanical efficiency the domestic micro wind turbine model with various lift augmentation arrangements
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Abstract: This paper presents an optimization model for rotor design of 750 kW horizontal axis wind turbine. The wind

Abstract: This paper presents an optimization model for rotor design of 750 kW horizontal axis wind turbine. The wind

This paper presents an optimization model for rotor design of 750 kW horizontal axis wind turbine. The wind turbine blade is a very important part of the rotor. In this work a blade of length 21.0 m is taken and airfoil for the blade is S809. The airfoil taken is same from root to tip. The model refers to a design method based on Type Approval Provision Scheme TAPS-2000. All the loads caused by wind and inertia on the blades are transferred to the hub. The stress and deflection were calculated on blades and hub by Finite element analysis method. Result obtained from ANSYS is compared with the existing design.
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Extended Kalman Filter based State Estimation of Wind Turbine

Extended Kalman Filter based State Estimation of Wind Turbine

Abstract -State estimation provides the best possible approximation for the state of the system by processing the available information. In the proposed work, the state estimation technique is used for the state estimation of wind turbine. Modern wind turbines operate in a wide range of wind speeds. To enable wind turbine operation in such a variety of operating conditions, sophisticated control and estimation algorithms are needed. The theoretical basis of Extended Kalman Filter algorithm is explained in detail and performance is tested with the simulation.
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Wind turbines support techniques during frequency drops — energy utilization comparison

Wind turbines support techniques during frequency drops — energy utilization comparison

de-loading technique. However, the provided support power from this algorithm is less compared to the other two methods, and it totally depends on the amount of extracted KE. Additionally, this algorithm must decelerate the rotor speed during frequency events, which consumes the electronic converters and increases the risk of loss of synchronism. Moreover, the rotor speed needs to recover its default value after support period, thus P op is reduced until rotor speed satisfies λ High again.

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Potential of wind power projects under the Clean Development Mechanism in India

Potential of wind power projects under the Clean Development Mechanism in India

the region prepares to invest over $12 billion in wind power generation capacity in the second half of this dec- ade. In India, wind power already occupies a prominent position with regard to installed capacity – reaching 6.2 GW by the end of 2006. In 2006 alone, an aggregate capacity of 1.8 GW has been added [8]. Thus, India is the fourth largest wind market in the world [18]. However, the total installed capacity of wind power projects still remains far below from their respective potential (i. e. <15%). One of the barriers to the large-scale dissemina- tion of wind power projects in India is the high upfront cost of these systems [19]. Other barriers to wind power projects are low plant load factors, unstable policies of the state governments and poor institutional framework. Wind has considerable amount of kinetic energy when blowing at high speeds [20]. This kinetic energy when passing through the blades of the wind turbines is con- verted into mechanical energy and rotates the wind blades [21] and the connected generator, thereby producing elec- tricity. A wind turbine primarily consists of a main tower, blades, nacelle, hub, main shaft, gearbox, bearing and housing, brake, and generator [22]. The main tower is 50– 100 m high. Generally, three blades made up of Fiber Reinforced Polyester are mounted on the hub, while in the nacelle the major parts are housed. Under normal operating conditions the nacelle would be facing the upstream wind direction [20]. The hub connects the gear- box and the blades. Solid high carbon steel bars or cylin- ders are used as main shaft. The gearbox is used to increase the speed ratio so that the rotor speed is increased to the rated generator speed [21]; it is the most critical compo- nent and needs regular maintenance. Oil cooling is employed to control the heating of the gearbox. Gear- boxes are mounted over dampers to minimize vibration. Failure of gearbox may put the plant out of operation for an entire season as spares are often not available. Thus, new gearless configurations have become attractive for Regional distribution of the global installed wind power capacity (Source: [8])
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Investigation of Laminar-Turbulent Transition on a Rotating Wind Turbine Blade of Multi Megawatt Class with Thermography and a Microphone Array

Investigation of Laminar-Turbulent Transition on a Rotating Wind Turbine Blade of Multi Megawatt Class with Thermography and a Microphone Array

Figure 6. View from the optical camera on the spinner to the pressure side of the blade at R = 35 m. The black box contains all the data recording system including power supply. Chord there is 1.5 m. In addition, orientation of the 5-hole-probe relative to vertical axis (approx. rotor plane) indicates the instantaneous pitch to be compared with values from the SCADA system. Left: WT in standstill, right: WT in operation.

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Management of Green Supply Chain: Need of Hours

Management of Green Supply Chain: Need of Hours

Wind turbines are designed to exploit the wind energy that exists at alocation. Aerodynamic modelling is used to determine the optimum tower height, control systems, number of blades and blade shape. Wind turbines convert wind energy to electricity for distribution. Conventional horizontal axis turbines can be divided into three components. The rotor component, which is approximately 20% of the wind turbine cost, includes the blades for converting wind energy to low speed rotational energy. The generator component, which is approximately 34% of the wind turbine cost, includes the electrical generator, the control electronics, and most likely a gearbox (e.g. planetary gearbox, adjustable-speed drive or continuously variable transmission) component for converting the low speed incoming rotation to high speed rotation. Horizontal- axis wind turbines (HAWT) have the main rotor shaft andelectrical generator at the top of a tower, and must be pointed into the wind. Small turbines are pointed by a simple wind vane, while large turbines generally use a wind sensor coupled with a servo motor. Most have a gearbox, which turns the slow rotation of the blades into a quicker rotation that is more suitable to drive an electrical
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Generation of Electricity using Road Transport

Generation of Electricity using Road Transport

--------------------------------------------------------------------------------------------------------------------------------------------------- Abstract: The main objective of this project is “Generate electricity on road by Solar panels and Vertical Axis Wind Turbine” wherein, design of the components and their analysis has been carried out and, the fabrication of the model has been done as per the calculations that have been obtained from the design and analysis. Electricity has helped in reducing physical efforts to a very large extent, but, the way in which it is produced is quite a matter of concern. Even today, most of the electricity that we use is produced through conventional methods. These conventional methods commonly use fossil fuels to produce electricity. Not only are these methods expensive, but also cause grave damage to the environment. The use of fuels for the generation of electricity results in increased costs and emissions of hazardous pollutants. The only alternative is a new method that is not only cheap and efficient, but also eco-friendly.
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Power losses in electrical topologies for a multi-rotor wind turbine system

Power losses in electrical topologies for a multi-rotor wind turbine system

This study excludes the transformer losses. These are expected to increase with frequency [20], so the use of a medium-frequency transformer in the DC-to-DC converter will probably give higher total power losses in the DC cluster and hybrid cluster topologies than the total power losses in the AC cluster, which is using a grid-frequency transformer. However, the trade-off between how much space and weight this may save and how much the losses are increased is of interested and need further investigation. This will be performed in further studies, together with increasing the complexity of the system in terms of the number of rotors, but also by investigating dynamic conditions and varying wind profiles. Then it can be more visible the challenges regarding the control of the different topologies. However, a way of obtaining the power losses within the power converters are obtained and proved to provide meaningful results. This can therefore also be used in future work on this topic, in order to find a suitable topology for the electrical configurations of a multi-rotor wind turbine system.
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Design, Development And Performance Analysis Of Axial Flow Wind Turbine For Household Applications

Design, Development And Performance Analysis Of Axial Flow Wind Turbine For Household Applications

Most modern wind power is generated in the form of electricity byconverting the rotation of turbine blades into electrical current by means of an electrical generator.In windmills (a much older technology) wind energy is used to turn mechanical machinery to do physical work, like crushing grain or pumping water.Wind power is used in large scale wind farms for national electrical grids as well as insmall individual turbines for providing electricity to rural residences or grid-isolated locations (Saravanan, S.V., M. Varatharaj, 2013). Wind energy is renewable, widely distributed, cleans, and works against the greenhouse effect if used to replace the use of fossilfuel.The kinetic energy of the wind can be changed into other forms of energy, either mechanical energy or electrical energy.The kinetic energy contained in wind can be transferred to other objects, such as boat sails, or transformed into electrical energy through wind turbine generators[4 and 5].With the recent surge in fossil fuels prices, demands for cleaner energy sources, and government funding incentives, wind turbines are becoming a more viable technology for electrical power generation.
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Review on Micro-generation of Electricity Using Rooftop Turbine Ventilator (R.T.V)

Review on Micro-generation of Electricity Using Rooftop Turbine Ventilator (R.T.V)

The main component of the system is the AFPM generator. It will convert the kinetic energy from wind into electrical energy. The AFPM machine is used where low speed is require .The AFPM design have higher power density The AFPM machine have many unique features.it is more efficient. Figure [4] shows the schematically diagram of AFPM machine it consist of two outer rotor disc and one coreless stator in between.As it can be seen the Nd-Fe-B magnets are glue onto thinner surface of the two rotor discs .The poles of the rotor are arranged in opposite direction (N-S Type) and the stator winding of the machine has no iron core and the surface winding of the stator is perpendicular to the machine shaft .The diameter and thickness of the Nd-Fe-B permanent magnet is 20mm and 5 mm respective .
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Design and Blade Optimization of Contra Rotation Double Rotor Wind Turbine

Design and Blade Optimization of Contra Rotation Double Rotor Wind Turbine

The conventional wind turbines with large sized wind rotor generate high output in the moderately strong wind. The output of the small sized wind rotor is low such a wind rotor is suitable for weak wind. That is, the size of the wind rotor must be appropriately selected in conformity with potential wind circumstances. Besides, in general the wind turbines are equipped with the bra ke and or the pitch control mechanis ms, to control the speed due to the abnormal rotation and the overload generated at the stronger wind, and to keep the rotation of generator. In that sense, some studies present a good review of various invented the superior w ind turbine generator, T. Kane moto [1] has invented Intelligent Wind Turbine Generator (IWTG) co mposed of the large sized front wind rotor, the small sized rear wind rotor and the peculiar generator with inner and the outer rotational armatures, as the rotational speeds of the tandem wind rotor are adjusted pretty well in cooperation with the two armatures of the generator in response to the wind speed. The IWTG model is co mposed of tandem wind rotor using the flat b lades, and demonstrated the fundamentally superior operation of the tandem wind rotor. In this paper, the effect of the blade profiles using NACA profiles on the turbine using numerica l simu lation on the turbine performances are investigated to optimized the rotor profiles.
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II. METHODOLOGY A. Computational Domain

II. METHODOLOGY A. Computational Domain

Figure 10 shows the contour plot of the velocity magnitude within the vicinity of the rotors. Overlayed are the nodal values for more detailed inspection. As one can see, the contours with slightly higher magnitudes surround the downwind rotors more than turbine 1. Values exceeding 5m/s are slightly more upwind (top of each image for Figures 10b and 10c) suggesting higher local wind velocities within the streamlines that pass through the rotor blade path. The contour bands with velocities lower than 5m/s can be seen to be wider in front of turbine 1 (Figure 10a).
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