Methods and apparatus for power factor correction and reduction of distortion in and noise in a power supply delivery network

• US 8,674,544 B2
• Filed: 01/25/2011
• Issued: 03/18/2014
• Est. Priority Date: 01/26/2009
• Status: Active Grant

• Current Assignee: Geneva Cleantech, Inc
• Original Assignee: Geneva Cleantech, Inc
• Inventors: Rada, Patrick A., Magnasco, John H.
• Primary Examiner(s): Deberadinis, Robert L.
• Application Number:
  US13/013,737
• Publication Number:
  US 20110148202A1
• Time in Patent Office: 1,148 Days
• Field of Search: 307/38
• US Class Current: 307/38
• CPC Class Codes: G05F 1/70 Regulating power factor; Regulating reactive current or power

Abstract

Methods and apparatus for power factor correction include selectively coupling bit reactive loads with a load having dynamic reactive properties to dynamically correct a power factor. Methods and apparatus for reducing distortion in a power delivery system include a means for determining distortion in a power line, forming a corrective signal according to the distortion and selectively sinking and sourcing current to the power line according to the corrective signal. Furthermore, power for a solar power system is injected into a load via the same apparatus.

Claims

1. A system for reducing distortion in an electrical signal having distortion comprising:

a. an electric circuit for comparing at least a portion of the electrical signal having distortion in a power line to a desired reference signal, thereby forming a corrective signal; and

b. an electric circuit for selectively sinking and sourcing current from one of a DC rectifier and a solar panel to the electrical signal having distortion according to the corrective signal to correct the distortion; and

selectively injecting additive current from the solar panel into at least one of a load or a power grid.

2. The system of claim 1 further comprising a processor for determining when the solar power is generating current.

3. The system of claim 1 further comprising a processor for switching between the DC rectifier and the solar panel for sinking and sourcing current.

4. The system of claim 1 further comprising a transformer, the transforming having a primary winding and a secondary winding, for galvanically isolating the electric circuit for selectively sinking and sourcing from the power line.

5. The system of claim 4 wherein the secondary winding is coupled to the load in parallel.

6. The system of claim 4 wherein the secondary winding is coupled to the load in series.

7. The system of claim 1 wherein distortion comprises any among harmonic distortion, noise, elevated spectral noise, and amplitude modulation.

8. The system of claim 1 further comprising a power factor correction module for bringing a power factor of the electrical signal having noise to substantially one.

9. The system of claim 8 wherein the power factor correcting module comprises:

a. a sensor for measuring the reactive power of a first load coupled to power line; and

b. a plurality of bit reactive loads for coupling with the first load to counteract a reactive component of the first load.

10. The system of claim 1 wherein the electric circuit for selectively sinking or sourcing current applies the corrective signal to at least one controlled current source, wherein the controlled current source couples one of the DC rectifier and the solar panel with the power line according to the corrective signal.

11. The system of claim 1 wherein the electric circuit for selectively sinking or sourcing current comprises:

a. a modulator for modulating the corrective signal and applying the modulated corrective signal to at least one switch, wherein the switch couples a current provided by one of the DC rectifier and the solar panel with the power line; and

b. a filter for filtering a modulating signal.

12. The system of claim 11 wherein the modulator comprises any among a pulse width modulator, delta-sigma modulator, pulse code modulator, pulse density modulator, or pulse position modulator.

13. The system of claim 1 wherein the electric circuit for selectively sinking or sourcing current comprises:

a. a positive DC power supply selectively coupled to one of the DC rectifier and the solar panel for providing a positive DC current;

b. a negative DC power supply selectively coupled to one of the DC rectifier and the solar panel for providing a negative DC current;

c. a processor for selectively sourcing current into the power line from one of the positive DC power supply in response to a negative distortion;

or sinking current from the power line to the negative DC power supply in response to a positive distortion.

14. An apparatus for reducing harmonic distortion in a power line, the system comprising:

a. a phase line and a neutral line coupled between a utility power meter and an equivalent property load;

b. a rectifier coupled to the phase and neutral lines for rectifying AC current to DC current;

c. a solar power system for generating DC current;

d. a two position switch for selectively coupling one of the rectifier and the solar power system;

e. a processing system determining harmonic distortion in the phase line, generating a corrective signal, modulating the corrective signal, and controlling the two position switch;

f. a first transistor coupled between the two position switch and the load for selectively coupling positive current to the load according to the corrective signal to correct a negative distortion;

g. a negative power supply coupled to the two position switch for inverting DC power into a negative DC current;

h. a second transistor coupled between the negative DC power supply and the load for selectively coupling negative current to the load according to the corrective to correct a positive distortion; and

i. a transformer, comprising a primary winding and a secondary winding, for galvanically isolating the load from the first transistor and second transistor.

15. The apparatus of claim 14, wherein the secondary winding of the transformer is coupled to the load in parallel.

16. The apparatus of claim 14, wherein the secondary winding of the transformer is coupled to the load in series.

17. A method of correcting a harmonic distortion in a power line comprising:

a. measuring a current component in a power line;

b. generating a reference signal;

c. comparing the reference signal to the current component to generate a corrective signal;

d. generating positive DC current from one of a rectifier and a solar power system;

e. generating a negative DC current by inverting the positive DC current;

f. selectively sourcing the positive DC current into a load according to the corrective signal to correct a negative distortion;

g. selectively sourcing the negative DC current into a load according to the corrective signal to correct a positive distortion; and

h. injecting additional available power into at least one of the load and the power line from the solar power system, thereby increasing total current.

18. The method of claim 17 further comprising galvanically isolating the load from the positive DC power supply and negative DC power supply.

19. The method of claim 17 wherein galvanically isolating the load from the positive DC power supply and negative DC power supply coupling a galvanic isolator in parallel with the load.

20. The method of claim 17 wherein galvanically isolating the load from the positive DC power supply and negative DC power supply coupling a galvanic isolator in series with the load.

21. The method of claim 17 wherein generating a corrective signal comprises mixing the corrective signal with a modulating signal.

22. The method of claim 17 wherein selectively sourcing a positive DC current comprises filtering out the modulating signal.

23. The method of claim 17 wherein selectively sourcing a negative DC current comprises filtering out the modulating signal.

24. The method of claim 17 wherein generating positive DC current from one of a rectifier and a solar power system comprises:

a. determining whether the solar power system is generating current, and

b. sourcing current from the solar power system if the solar power system is generating, or sourcing current from the rectifier if the solar power system is not generating current.

25. A system for correcting harmonic distortion comprising:

a. means for determining the harmonic energy in a power line;

b. means for storing the harmonic energy; and

c. means for selectively releasing the harmonic energy to counter harmonic energy of an opposite magnitude.

26. The system of claim 25 wherein the means for determining the harmonic energy in a power line comprises:

a. a sensor for measuring a current component in a power line;

b. an oscillator for generating a reference signal; and

c. a comparator for comparing the current component to the reference signal there by generating a corrective signal, wherein the corrective signal represents harmonic energy in the power line.

27. The system of claim 25 wherein the means for storing energy comprises at least one capacitor.

28. The system of claim 25 wherein the means for selectively releasing the harmonic energy comprises a switch.

29. The system of claim 28 wherein the switch selectively couples the means for storing harmonic energy between any among a positive power supply, a negative power supply, and a load.

30. The system of claim 25 further comprising a modulator to modulate the corrective signal to drive a transistor to selectively charge the means for storing energy.

31. A method of correcting harmonic distortion in a signal having harmonic distortion comprising:

a. determining the harmonic energy in a power line;

b. storing the harmonic energy, and

c. selectively releasing the harmonic energy to counter harmonic energy of an opposite magnitude.

32. The method of claim 31 wherein determining the harmonic energy in a power line comprises:

a. measuring a current component in a power line;

b. generating a reference signal; and

c. comparing the current component to the reference signal there by generating a corrective signal, wherein the corrective signal represents harmonic energy in the power line.

33. The method of claim 31 wherein storing energy comprises charging at least one capacitor.

34. The method of claim 31 wherein selectively releasing the harmonic energy comprises activating a switch.

35. The method of claim 34 wherein activating the switch selectively couples the means for storing harmonic energy between any among a positive power supply, a negative power supply, and a load.

36. The method of claim 31 further comprising a modulating the corrective signal to drive a transistor to selectively charge the means for storing energy.

37. A system for reducing distortion in an electrical signal having distortion comprising:

a. means for comparing at least a portion of the electrical signal having distortion in a power line to a desired reference signal, thereby forming a corrective signal;

b. means for selectively sinking and sourcing current to the electrical signal having distortion from a negative power supply and a positive power supply respectively;

c. means for modulating the positive power supply according the corrective signal; and

d. means for modulating the negative power supply according to the corrective signal.

38. The system of claim 37 wherein means for comparing comprises:

a. a sensor for sensing the signal having distortion;

b. an oscillator for generating a reference signal; and

c. a comparator for comparing the signal having distortion to the reference signal thereby generating a corrective signal.

39. The system of claim 37 wherein means for selectively sinking and sourcing current comprises a first transistor coupled to the positive power supply for sourcing current to correct a negative harmonic according to the corrective signal, and a second transistor coupled to the negative power supply for sinking current to correct a positive harmonic according to the corrective signal.

40. The system of claim 37 wherein the means for selectively sinking and sourcing current further comprises a modulator for modulating the corrective signal.

41. The system of claim 37 wherein the means for modulating the positive power supply comprises:

a. a first transistor for receiving the corrective signal; and

b. an LC-flywheel network for deriving a positive average of the corrective signal.

42. The system of claim 37 wherein the means for modulating the negative power supply comprises:

a. a second transistor for receiving the corrective signal; and

b. an LC-flywheel network for deriving a negative average of the corrective signal.

43. A method for reducing distortion in an electrical signal having distortion comprising:

a. comparing at least a portion of the electrical signal having distortion in a power line to a desired reference signal, thereby forming a corrective signal;

b. selectively sinking and sourcing current to the electrical signal having distortion from a negative power supply and a positive power supply respectively;

c. modulating the positive power supply according the corrective signal; and

d. modulating the negative power supply according to the corrective signal.

44. The method of claim 43 wherein comparing comprises:

a. sensing the signal having distortion;

b. generating a reference signal; and

c. comparing the signal having distortion to the reference signal thereby generating a corrective signal.

45. The method of claim 43 wherein selectively sinking and sourcing current comprises:

a. controlling the gate of a first transistor coupled to source current from the positive power supply to correct a negative harmonic according to the corrective signal, and

b. controlling the gate of a first transistor coupled to sink current to the negative power supply to correct a positive harmonic according to the corrective signal.

46. The method of claim 43 wherein the selectively sinking and sourcing current further comprises modulating the corrective signal.

47. The method of claim 43 wherein modulating the positive power supply comprises:

a. modulating the corrective signal;

b. receiving the corrective signal; and

c. deriving a positive average of the corrective signal.

48. The method of claim 43 wherein modulating the negative power supply comprises:

a. modulating the corrective signal;

b. receiving the corrective signal; and

c. deriving a negative average of the corrective signal.

49. A system for reducing distortion in an electrical signal having distortion in a power line, comprising:

a. an electric circuit for comparing at least a portion of the electrical signal having distortion to a desired reference signal, thereby forming a corrective signal; and

b. an electric circuit for selectively sinking current from the power line and sourcing current to the power line in response to the corrective signal, wherein the system comprises a single current sensor.