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One or more tethered platforms, each having three or more; mill rotors, are operated at altitudes in relatively high winds to generate electricity. These windmill kites use one or more electro-mechanical tethers on each platform. Their position, attitude and orientation are monitored by one or more GPS receivers and/or gyros and controlled through differential thrusts and torque-reactions produced by the mill rotors. The kites can be electrically powered from a ground supply during relatively calm periods, or landed if desired. During windy periods the kites may be used to generate electricity by tilting the rotors at an angle, or incidence to the on-coming wind. In this generate mode the mill rotors simultaneously develop thrust while generating electricity.

Citations

Cited PatentFiling dateIssue dateOriginal AssigneeTitle
US4073516Jun 6, 1975Feb 14, 1978Wind driven power plant
US4076190Mar 30, 1976Feb 28, 1978Apparatus for extracting energy from winds at significant height above the surface
US4166596Apr 28, 1978Sep 4, 1979Airship power turbine
US4251040Dec 11, 1978Feb 17, 1981Wind driven apparatus for power generation
US4285481Dec 7, 1979Aug 25, 1981Multiple wind turbine tethered airfoil wind energy conversion system
US4450364Mar 24, 1982May 22, 1984Lighter than air wind energy conversion system utilizing a rotating envelope
US4486669Nov 9, 1981Dec 4, 1984Wind generator kite system
US4491739Sep 27, 1982Jan 1, 1985Airship-floated wind turbine
US6254034Sep 20, 1999Jul 3, 2001Tethered aircraft system for gathering energy from wind
US6523781Aug 29, 2001Feb 25, 2003Axial-mode linear wind-turbine
US20040056485Sep 20, 2002General Electric CompanyIntegrally formed sheet metal tube flange

Referenced by

Citing PatentFiling dateIssue dateOriginal AssigneeTitle
US7504741Mar 30, 2007Mar 17, 2009Skysails GmbH & Co. KGWind energy plant with a steerable kite
US7675189Jul 17, 2008Mar 9, 2010Baseload Energy, Inc.Power generation system including multiple motors/generators
US7816800Feb 9, 2010Oct 19, 2010Baseload Energy, Inc.Electric generation system including multiple motor/generators
US7830033May 3, 2010Nov 9, 2010Wind turbine electricity generating system
US8066225Jan 19, 2009Nov 29, 2011Multi-tether cross-wind kite power

Claims

1. A method of maintaining a flying electric generator with one or more rotors within a defined airspace comprising:

determining a desired position for said generator;

determining an observed position of said generator using one or more Global Positioning Receivers;

generating one or more error signals defining the difference between the observed position of said generator and the desired position for said generator; and

altering the thrust vector of one or more rotors of said generator in response to said error signals to move said generator towards said desired position if necessary.

2. The method of claim 1 wherein said one or more rotors have one or more blades; and

the thrust vector of at least one of said rotors of said generator is altered by collective pitch control of said one or more blades.

3. The method of claim 1 wherein said generator has at least two rotors;

each rotor has at least one blade; and

the thrust vector of at least one of said rotors of said generator is altered by differential collective pitch control of said one or more blades.

4. The method of claim 1 wherein said generator has at least two rotors.

5. A method of maintaining a flying electric generator with at least one tether within a defined airspace comprising:

determining a desired position for said generator;

determining an observed position of said generator using one or more Global Positioning Receivers;

generating one or more error signals defining the difference between the observed position of said generator and the desired position for said generator; and

adjusting the length of said at least one tether to move said generator towards said desired position for said generator if necessary.

6. The method of claim 5 further comprising altering the thrust vector of one or more rotors of said generator in response to said one or more error signals to move said generator towards said desired position if necessary.

7. The method of claim 6 wherein said one or more rotors have one or more blades; and

the thrust vector of at least one of said rotors of said generator is altered by collective pitch control of said one or more blades.

8. The method of claim 6 wherein said generator has at least two rotors;

each rotor has at least one blade; and

the thrust vector of at least one of said rotors of said generator is altered by differential collective pitch control of said one or more blades.