Method and apparatus for removal of harmonic noise

• US 8,581,446 B2
• Filed: 02/06/2012
• Issued: 11/12/2013
• Est. Priority Date: 02/06/2012
• Status: Active Grant

• Current Assignee: Elwha LLC (Intellectual Ventures LLC)
• Original Assignee: Elwha LLC (Intellectual Ventures LLC)
• Inventors: Deane, Geoffrey F., Fyke, Aaron, Gross, William, Hyde, Roderick A., Jung, Edward K. Y., Kare, Jordin T., Myhrvold, Nathan P., Tegreene, Clarence T., Wood, Lowell L. Jr., Chan, Alistair K.
• Primary Examiner(s): Fleming, Fritz M
• Application Number:
  US13/367,195
• Publication Number:
  US 20130200946A1
• Time in Patent Office: 645 Days
• Field of Search: 307/105
• US Class Current: 307/105
• CPC Class Codes: F02B 63/04 for electric generators
• CPC Class Codes: H02J 3/01 Arrangements for reducing harmonics or ripples
• CPC Class Codes: Y02E 40/40 Arrangements for reducing harmonics

Abstract

An apparatus for removing harmonic noise from a power transmission line transmitting electricity at a primary frequency includes a filter and a controller coupled to the sensor and to an actuator-generator. The filter separates electricity at a harmonic of a primary frequency from the electrical signal transmitted by the power transmission line. The controller is configured to modulate consumption of electricity from the power transmission line. The consumption is controlled by electrical actuation of the actuator-generator, such that the electrical actuation of the actuator-generator causes consumption of electricity from the power transmission line at a harmonic of the primary frequency. The actuator-generator is coupled to an elastically deformable component, such that electrical actuation of the actuator-generator generates tension in the elastically deformable component.

Claims

1. An apparatus for removing harmonic noise from an electrical signal transmitted by a power transmission line, the electrical signal transmitting electricity at a primary frequency, the apparatus comprising:

a filter configured to separate electricity at a harmonic of the primary frequency from the electrical signal transmitted by the power transmission line; and

a controller coupled to the filter and to an actuator, the controller configured to control consumption of electricity at the harmonic of the primary frequency, the consumption controlled by electrical actuation of the actuator, such that electrical energy at the harmonic of the primary frequency is consumed through the electrical actuation of the actuator,

wherein the actuator is coupled to an elastically deformable component, such that electrical actuation of the actuator generates tension in the elastically deformable component.

2. The apparatus of claim 1, wherein the filter is configured to pass the electricity at the primary frequency through the filter and back to the power transmission line.

3. The apparatus of claim 1, further comprising a sensor for measuring noise in the power transmission line, the noise characterized by a frequency distinct from the primary frequency.

4. The apparatus of claim 1, wherein the actuator includes at least one of an electro-hydraulic component, an electromechanical component, an electromagnetic component, or an electro-fluidic component.

5. The apparatus of claim 1, wherein the actuator includes a piezoelectric component.

6. The apparatus of claim 1, wherein the elastically deformable component is a cable.

7. The apparatus of claim 6, wherein the actuator is coupled to an end of the cable.

8. The apparatus of claim 6, wherein the actuator is coupled to the cable at a point on the cable disposed between a first end of the cable and a second end of the cable.

9. The apparatus of claim 6, wherein the actuator is coupled to a first end of the cable and a second end of the cable.

10. The apparatus of claim 6, wherein the cable is composed of steel.

11. The apparatus of claim 6, wherein the cable is composed of an organic polymer.

12. The apparatus of claim 6, wherein the cable is composed of a synthetic polymer.

13. The apparatus of claim 6, wherein the cable is composed of a carbon fiber.

14. The apparatus of claim 6, wherein the cable is configured in a plurality of folds.

15. The apparatus of claim 14, further comprising a plurality of bearings on which the cable configured in a plurality of folds is disposed.

16. The apparatus of claim 6, further comprising a force bearing support coupled to the cable.

17. The apparatus of claim 6, wherein the cable is a hanging cable.

18. The apparatus of claim 17, further comprising weights coupled to the hanging cable.

19. The apparatus of claim 6, wherein the cable is pre-tensioned.

20. The apparatus of claim 1, wherein the actuator is coupled to the elastically deformable component, such that electrical actuation of the actuator generates torsional tension in the elastically deformable component.

21. The apparatus of claim 1, wherein the actuator is coupled to the elastically deformable component, such that electrical actuation of the actuator generates linear tension in the elastically deformable component.

22. The apparatus of claim 1, further comprising a housing in which at least a portion of the elastically deformable component and the actuator are disposed.

23. The apparatus of claim 1, wherein the actuator includes a rotary motor.

24. The apparatus of claim 1, wherein the actuator includes a linear motor.

25. The apparatus of claim 1, wherein the actuator is further configured to maintain the tension generated in the elastically deformable component.

26. The apparatus of claim 1, wherein the actuator includes at least one of a brake, a releasable ratchet, or a movable pin actuatable to maintain the tension generated in the elastically deformable component.

27. The apparatus of claim 1, further comprising a sensor coupled to at least one of the elastically deformable component or the actuator, the at least one sensor configured to measure a force applied by the actuator to generate the tension in the elastically deformable component.

28. The apparatus of claim 1, further comprising a sensor coupled to at least one of the elastically deformable component or the actuator, the at least one sensor configured to measure a torque applied by the actuator to induce the tension in the elastically deformable component.

29. The apparatus of claim 1, further comprising at least one sensor coupled to at least one of the elastically deformable component or the actuator, the at least one sensor configured to measure stress in the elastically deformable component.

30. The apparatus of claim 1, further comprising a strain gauge coupled to the elastically deformable component for measuring strain in the elastically component.

31. The apparatus of claim 1, further comprising a strain gauge coupled to the elastically deformable component for measuring linear strain in the elastically deformable component.

32. The apparatus of claim 1, further comprising a strain gauge coupled to the elastically deformable component for measuring shear strain in the elastically deformable component.

33. The apparatus of claim 1, wherein the actuator is coupled to the elastically deformable component, such that electrical actuation of the actuator causes application of a transverse force to the elastically deformable component.

34. The apparatus of claim 1, further comprising a generator coupled to the at least one elastically deformable component, such that mechanical actuation of the generator via a release of tension in the elastically deformable component, causes a generation of electricity by the generator.

35. The apparatus of claim 34, wherein the actuator and the generator are coupled.

36. The apparatus of claim 34, wherein the generator is configured to generate electricity at the primary frequency.

37. The apparatus of claim 34, wherein the generator is configured to generate electricity at the harmonic frequency.

38. An apparatus for removing harmonic noise from an electrical signal transmitted by a power transmission line, the electrical signal transmitting electricity at a primary frequency, the apparatus comprising:

a filter configured to separate electricity at a harmonic of the primary frequency from the electrical signal transmitted by the power transmission line; and

a controller coupled to the filter and to a power transducer, the controller configured to control consumption of electricity at the harmonic of the primary frequency, the consumption controlled by electrical actuation of the power transducer, such that electrical energy at the harmonic of the primary frequency is consumed through the electrical actuation of the power transducer,

wherein the power transducer is coupled to an elastically deformable component, such that electrical actuation of the power transducer generates tension in the elastically deformable component.

39. An apparatus for removing harmonic noise from a power transmission line transmitting electricity at a primary frequency, the apparatus comprising:

a filter configured to separate electricity at a harmonic of the primary frequency from the electricity transmitted by the power transmission line; and

a controller coupled to the filter and to an actuator-generator, the controller configured to control consumption of the electricity from the power transmission line, the consumption controlled by electrical actuation of the actuator-generator, such that the electrical actuation of the actuator-generator causes consumption of the separated electricity at the harmonic frequency of the primary frequency,

wherein the actuator-generator is coupled to an elastically deformable component, such that electrical actuation of the actuator-generator causes an application of tension to the elastically deformable component.