A Novel Approach For The Renewable Energy Production Using(Awe)

S.Senthil Nathan[1], Divya Mogalie[2].RMK GROUP OF INSTITUTIONS,AFFILIATED TO ANNA

UNIVERSITY.

Abstract-The Interest Towards The Renewable Energy Source Is High,When Compared To Earlier Days.

This Paper Provides Guidelines For The Portable Of

Airborne Wind Energy With Power System.Nowadays

Non-Renewable Source Couldn’t Satisfy The Need Of

Power.Thus Renewable Energy Is Newly Emerging

One.The Most And Main Advantage Of Airborne Wind

Energy Is Portable .It Can Supply A Power To Particular

Area Up To 60MW With Help Of Yoyo Generator.The

Cost Level Is More Lesser When Compared To Existing

Wind System.The Existing Wind System Has Many

Disadvantages Which They Cannot Overcome From It.The

Main Drawback Of The Existing System Is, It Doesn’t

Work When Air Speed Is Below 3km/Hr.And Lead To

Damage Under -20’ C .If Not,Cost Will Be Increased

Because Heater To Be Placed Inside The Turbine.Whereas

In Airborne Wind Energy System We Don’t Have Such

Demerits Because It Can Be Controlled From The Base

Station.The Airborne Wind Energy Comprises Of

Generator,Gear Box,Winch Or Belt And Air Balloon With

Helium Gas Etc.Ethe Construction Of Generator In The

Airborne Wind Energy(Awe) Takes Place In Two

Types,Generator Can Be Placed Ethier In Base Station Or

In High Altitude.After Generating A Power It Is Connected

To The Power System.Thus,This Paper Discuss About

Airborne Wind Energy(AWE) System And Its Applications

Index Terms:-Higher Altitude,Power System,AWE,Energy

Storage Device,Etc

Literature survey

With reference to the paper:optimal locations and variability of

awe published by ELSEVIER,however the high wind speeds

are found at the lowest possible altitudes,to minimize the drag

induced by tether.in accordance with his views the airballoon

can be placed below the troposphere(

II Generators

There are many different types of generators used today in wind turbines, but the most common types are asynchronous generators. The two types most commonly used are the squirrel cage induction generator and the wound rotor induction

generator—also known as a doubly feed induction generator (DFIG).Induction generators operate by mechanically turning their rotors faster than synchronous speed. A regular AC asynchronous motor usually can be used as a generator, without any internal modifications.

Equivalent circuit of an AC generator

In practice, the leakage reactance XL and the armature reaction reactance Xar are combined to get synchronous reactance Xs.

Hence the equivalent circuit of an alternator is changed to

Thus in the equivalent circuit shown,

Eph = induced e.m.f. per phase on no load

Vtph = terminal voltage per phase on load

Iaph = armature resistance per phase

Zs = synchronous impedance per phase

A sinusoidal waveform

The above figure shows (+) & (-) cycle

Output of the generator is

III Airborne wind energy(awe)

Actuallty airborne wind energy system deals with mechanical and areo dyanamics mechanism.it provides information purely about

renewableenergy..

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complete view of AWE

The above picture shows only a diagram of the airborne wind energy.

An airborne wind turbine is a design concept for a wind turbine with a rotor supported in the air without a tower, thus benefiting from more mechanical and aerodynamic options, the higher velocity and

persistence of wind at high altitudes, while avoiding the expense of tower construction, or the need for slip rings or yaw mechanism. An electrical generator may be on the ground or airborne. Challenges include safely suspending and maintaining turbines hundreds of meters off the ground in high winds and storms, transferring the harvested and/or generated power back to earth, and interference with aviation.

Airborne wind turbines may operate in low or high altitudes; they are

part of a wider class of airborne wind energy systems (awes) addressed by high-altitude wind power and crosswind kite power. When the generator is on the ground, then the tethered aircraft need not carry the generator mass or have a conductive tether. When the generator is aloft, then a conductive tether would be used to transmit energy to the ground or used aloft or beamed to receivers using

microwave or laser. Kites and 'helicopters' come down when there is insufficient wind; kytoons and blimps may resolve the matter with other disadvantages. Also, bad weather such as lightning or thunderstorms, could temporarily suspend use of the machines, probably requiring them to be brought back down to the ground and covered. Some schemes require a long power cable and, if the turbine is high enough, a prohibited airspace zone. As of july 2015, no commercial airborne wind turbines are in regular operation. In May

2013, an airborne wind energy system with a ground-based generator using fast motion transfer was suggested by L. Goldstein.For generator,Base station located in a preferable area so that awe can be easily controlled and maintained.airballoon is filled with the helium gas.inside the airballoon shaft is placed,due to wind the blades on the system rotates so that shaft also rotates.

Both the ends are connected with a winch or belt to the generator.before a generator gear box is located in order to get constant frequency.output of the generator is connected to the inverter followed by transformer.after getting a pure sine wave it is fed in to the gird.so that notches and some disadvantages are minimized.

Applications In Ships ,in a small villages,etc.

Rectifier

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as

rectification. Physically, rectifiers take a number of forms, including vacuum tube diodes, mercury-arc valves, copper and selenium oxide rectifiers, semiconductor diodes, silicon-controlled rectifiers and other silicon-based semiconductor switches.

Chopper

Though the applications of airborne wind energy is more,in marine areas,(i,e) alternatingcurrent(ac) is converted into the directcurrent(dc) and chopper is connected to it.chopper converts the fixed dc into a variable dc.chopper is of two

types.(i,e)step-up and step-down chopper

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https://en.wikipedia.org/wiki/Wind_turbinehttps://en.wikipedia.org/wiki/Slip_ringhttps://en.wikipedia.org/wiki/Yaw_drivehttps://en.wikipedia.org/wiki/High-altitude_wind_powerhttps://en.wikipedia.org/wiki/Crosswind_kite_powerhttps://en.wikipedia.org/wiki/Kite_flyinghttps://en.wikipedia.org/wiki/Kytoonhttps://en.wikipedia.org/wiki/Blimphttps://en.wikipedia.org/wiki/Lightninghttps://en.wikipedia.org/wiki/Thunderstormhttps://en.wikipedia.org/wiki/Prohibited_airspacehttps://en.wikipedia.org/wiki/Electric_power_conversionhttps://en.wikipedia.org/wiki/Alternating_currenthttps://en.wikipedia.org/wiki/Direct_currenthttps://en.wikipedia.org/wiki/Vacuum_tubehttps://en.wikipedia.org/wiki/Diodehttps://en.wikipedia.org/wiki/Mercury-arc_valvehttps://en.wikipedia.org/wiki/Semiconductor_diodehttps://en.wikipedia.org/wiki/Silicon-controlled_rectifier

4.1 Step-up chopper

In step-up converter output voltage is greater than input voltage. This is obtained by switching of a semiconducting device.output voltage is increased by switching frequency(i.e.) depends on pulse given to the device. When switch is in offposition, the output voltage is same as input. When switch is

on mosfet is assumed as short hence current flow in a small path so inductor is strengthend, and in continues path it gets output greater than input.

Step-down chopper

In step-down converter output voltage is lesser than input voltage. This is obtained by switching of a semiconducting device. The output voltage is decreasing by switching off the device. When device is in off position, there won’t be any

contact between load and input so the obtaining output voltage is zero. When device is on position, output voltage will be obtained hence the loop continues.

Equvalent circuit of stepdown chopper

VI Conclusion

A novel approach for the renewable energy production using

using AWE Technology has been proposed and targeted at

determination of low altitude wind power production

system.this model employs power production system .for an

transmission line winch is preferred in this model and

proposed.winch is used for achieving a consistent and accurate

response of the overall system.this model is capable of

producing a power upto 12mw.this model produces consistenty

and accurate output waveforms.

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VII References

[1]Renewable Energy,Airborne Wind Energy:Optimal

Locations And Variability,Cristina L.Archer*,Luca Delle

Monache,Daran L.Rife United States.

[2]Control Engineering Practice,Flight Control Of Tethered

Kites In Autonomous Pumping Cycles For Airborne Wind

Energy,Micahel Erhard*,Hans Strauch Germany.

[3]Design Of A Small-Scale Prototype For Research In

Airborne Wind Energy, Lorenzo Fagiano,And Trevor Marks.

[4]Power Conversion System For High Altitude Wind Power

Generation With Medium Voltage Ac Transmission, Jeevan

Adhikari*,I.V.Prasanna,S.K. Panda. Singapore.

[5]Multi –Mass Dynamic Model Of A Variable-Length Tether

Used In A High Altitude Wind Energy System,Milan

Milutinovic*,Nenad Karjnjcevic,Josko Deur Croatia.

[6]Theoretical Analysis Of An Airborne Wind Energy

Conversion System With A Ground Generator And Fast

Motion Transfer,Leo Goldstein USA

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