wpi kite powerd system

8/12/2019 WPI Kite Powerd System

1/16


2/16

Present Energy Scenario At present, about 80% of the world electric energy is produced from

thermal plants making use of fossil sources (oil, gas, coal).

The economical, geopolitical and environmental problems related to

such sources are becoming everyday more and more evident.

Prominent alternative sources- Wind and Solar power.

Is it possible to invert the percentage split between non-renewable and

renewable sources with the present renewable technologies.


3/16

Limits of Present Renewable Technologies High production cost-incentives required for

installation

High Land occupation.

Low efficiency


4/16

Existing Design ProblemsWind at 800 m is out of the reach of

current and future aero-generating towers,

already struggling at 100 m.

The structure holding up the rotors

becomes exponentially heavier, more

unstable and expensive.


5/16

A New concept of Wind Energy Generation Breakthrough in wind energy generation -capturing

high altitude wind power .

Basic idea- Use tethered airfoils, linked to the groundwith one or more cables which are employed to controltheir flight.

Convert the aerodynamical forces-> mechanical and

electrical power.


6/16

Altitude vs Ground windWind power is already extremely promising at approx.

800 meters, where the average wind speed is estimatedat 7,2 m/s.

The related wind power is almost 4 times the oneglobally available for wind towers.

4 6 m/s 205 W/m^27 2 m/s 58 W/m^2


7/16

WPI Kite Powered System Developed at Worcester polytechnic institute ,UK.

Guided By Prof. David Olinger and Mr.J.S.Geola

Chosen as :

It got simpler construction.

Low size requirement

Better suited for developing nations


8/16

Technology Oscillatory motion of kites converted to rotational

motion.

Major parts include:Kite

Tether

Power Conversion System

Rocker Arm

Sprag Clutch

Fly Wheel

Electric Generator


9/16


10/16

Literature ReviewJ.S.Geola

In 1983 proposed a Kite Powered system

Analysis of the steady state motion ofthe kite.

Design of the kite and the mechanism.

Developed and numerically solved the

governing differential equations ofmotion for a kite-powered pump

Relationship between various factorsdetermined


11/16

David Olinger

Wind Power from Kites Project report 2007Performance Characteristics of 1 KW Kite

powered system Developed WPI system demonstrator in 2007.

Steady state and Dynamic state model of the kite wasdeveloped.

Previously developed MATLAB code was used to modelthe final system design, and power outputs comparableto small wind turbines were predicted.


12/16

To use the previously developed Static and Dynamicmodels to simulate and study kite motion.

Solving the governing equations using Runge-Kuttascheme to assess how performance parameters of thesystem such as output power, cycle time, and tethertension varied with wind speed, kite area, andaerodynamic characteristics of the kite.

Effect of cyclic loading on the kite tether to be found.

To use a sled kite and find its effects on the poweroutput.

OBJECTIVES


13/16

System SimulationsSTEADY STATE SIMULATION

Goal : Find the kite tethertension created by the kite.

Unlike Geola uses varying(L/D) ratios.

Normalized Kite velocity,weight, and the lift over drag

ratios are required. Line tension, Chain tension,

Torque and RPM are to befound


14/16

DYNAMIC STATE SIMULATION

Goal: Operational characteristicsof the system to be viewed inresponse to time.

Allows predictions on thefunctionality of the system.

Differential equations are obtainedthat describe the motion of kite

from previous models. Solved using Runge-kutta method

using MATLAB.

Power output and Power

Coefficient are found.


15/16

Analysis of

performanceparameters of thesystem such as outputpower, cycle time, and

tether tension variedwith wind speed, kitearea, and aerodynamiccharacteristics of the

kite is done. Effect of cyclic loading

is found using linetension.


16/16

References M. Canale, L. Fagiano, M. Milanese and M. Ippolito, Control of

tethered airfoils for a new class of wind energy generator, in Proc. 45thIEEE CDC, San Diego, CA, 2006

Blouin, M., Isabella, B., & Rodden, J. (2007). Wind Power from Kites.MQP Project, Worcester Polytechnic Institute, Department ofAerospace Engineering, Worcester.

Buckley, R., Colschen C., DeCuir M., Simone N., Lovejoy E., Hurgin M.,(2008). Design of a One Kilowatt Scale Kite Power System. MQPProject , Worcester Polytechnic Institute, Department of AerospaceEngineering, Worcester.

wpi kite powerd system

Documents