A NOVEL AIRBORN MULTI-TURBIN FLOATING WIND ENERGY GENERATOR

Saeed Rahmani, Ali Ghambari

ABSTRACT
The ground mounted wind turbines extract low wind energy. The increasing trend of energy consumption causes the wind energy become important but it energy extraction still is in amount and wind energy plans may not satisfy the future energy need. The contra rotor wind energy generators the benefits two wind turbines and has higher wind energy extraction ratio. but these wind turbines are complicate to manufacture and still work at low altitude or monuted on the ground which extract low wind energy. The flying kite energy which uses kites pushed by wind flow and it pulls a string and the string turns shaft of an electrical generator but the flying kit are hard to control as they become untasable in high wind speeds. the floating savious style wind turbines that floating at high altitude and generate electricity send to ground via a conductive tether but the consruction of damm are costly and not possible everywhere. In this paper, to increase the wind energy extraction efficiency a new airborn multi wind turbin generator is proposed. The new wind turbine extract more wind energy as it will be at high altitude. The wind turbin is low cost and also need minimum structural materials and small ground..

KEYWORDS: Global warming, wind energy, wind turbin, electrical generator, efficiency, electrical generator, airborne energy

INTRODUCTION The air friction with the earth surface is high because of mountains, buildings, trees which reduces the wind speed, and wind turbines extract a low energy. The low altitude winds are low speed because of air friction with earth surface. They have a low wind energy.. Every year countires parliment legislate wind energy plans but because almost all these plans are ground mounted wind turines they extract not enough energy and hardly satisfy the plan pupose. The human civilication energy need is increasing and the movement to the wind power extraction started but still this technology is not matured enoug and it cannot extract the needed energy from the wind. To solve this problem several solutions proposed so far. Convetional wind turbines has a single turbine but contra-rotor wind turbines has two turbine which are connected as both sides of an type of eletrical generator that has two shafts but although this contra rotor wind turbines extract more energy but the wind speed near ground surface is weak that is generate still not satifying wind energy. Also, the contra roto wind tubines has uses a generator that has two rotors inside and so this generator has two shaft and one wind turbine is connected to each shaft. It will have totally two wind turbines and they rotate when wind blow but in opposite directions because the blade angle of the two turbines designed to be in opposit.. Flying kite have a wind area that can collect more wind energy. The flying kite can extract 40 times more energy than a similar wind turbin with the same cost. Flying kite will be flying at sky and it pulles a string that turns an electrical generator but these flying kite at sky need to be controlled and their pitch angle is controlled. Because when they ascend their pitch angle is andjusted so it collected wind energy, and it descend its pitch angle is controlled so it does not collect wind energy and it easily come to back to ground station. In fact, the flying kite should be controlled so that it perodically ascend and descend from the ground. Futhermore, the flying kite although has a high energy extraction ratio but they need a complicated control strategy to control their pitch angle during operation. inflatable cyrlandircal shabed wind turbines rotate around their horizontal axis and rotate a generate connected to it. This wind turbine are savrnois style wind tubine but are filled with helium gas and float at a high altitude and tranmit generated elecgtrcity to the ground via a enforced cable but damms are costy, because damms need a huge amount of construction materials and takes a long time to construct. It also need tranmission line to deliver electrixal energy to the national grid.. Moreover, the floating savonus wind turbine are cyladrical shap wind turbines that filled with lighter than air gas and they are floating at high altitude . To solve these problems in past solutions, in this paper, . the high altitude winds are persistent and stronger than low altitude winds and the proposed wind turbin in this paper will operate at high altitudes extracts higher wind energy compared to ground mounted wind turbines. . When at ground there wind are weak or not persistent, this propsoed wind turbine in in exposure of high altitude high speed wind and generates electrical energy tranmit to earth. . When at ground there wind are weak or not persistent, this propsoed wind turbine in in exposure of high altitude high speed wind and generates electrical energy tranmit to earth.

METHODOLOGY

Fig. 1. The floating ligh weight wind turbine generator framed with a inflatable circular ballon filled with lighter than air gas.

Fig. 2. Light weight electrical generator with aluminum made shaft and envelop.

Fig. 2. Multiple floating wind turbines framed in an rectangular aluminum frame floating at high altitude.

Fig. 3. The tether has an condutive wire and three strong ligh weigh carbon fibers and data cabel coated with cotton.

Fig. 4. The generated wind energy is transfered to ther ground via the conductive tethers.

Fig. 5. The ground station receives the electrical energy via the tether and also control the tether length The electrical voltage is increased by step up power transformer to be fed into grid.

Fig. 6. A high altitude floating wind farm consisted of several floating multi wind turbine generator.

CONCLUSION

REFRENCES
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