Method and apparatus for a solar power conditioner

• US 6,351,400 B1
• Filed: 01/18/2000
• Issued: 02/26/2002
• Est. Priority Date: 01/18/2000
• Status: Expired due to Fees

• Current Assignee: Enviropower Corporation
• Original Assignee: Eviropower Corporation
• Inventors: Lumsden, John L.
• Primary Examiner(s): Patel, Rajnikant B.
• Application Number:
  US09/484,747
• Time in Patent Office: 770 Days
• Field of Search: 363/95, 363/59, 363/98, 363/132, 363/32, 363/97, 363/46, 363/17, 363/34, 323/222, 323/906, 323/299, 307/73, 307/66, 307/67
• US Class Current: 363/95
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/44 with means for ensuring correct phase sequence
• CPC Class Codes: H02J 3/48 Controlling the sharing of the in-phase component
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects
• CPC Class Codes: Y10S 323/906 Solar cell systems

Abstract

A method and apparatus for supplementing electrical power production during peak demand power consumption is presented. A solar power conditioner converts DC electrical power provided by solar panels (or otherwise) to AC power and uses this to supplement main AC electrical power generated by a power utility (or otherwise) when needed. Both the DC power and the main AC power are digitalized by analog to digital (A/D) converters and continuously monitored by a central processor (CPU). The CPU aims to match the generated AC power of the inverter to that of the main AC power and, after tripping a breaker, supplements the main AC power with that of the converted power provided by the solar panels. In such a supplementary role, the solar power conditioner can be inserted into a utility'"'"'s distributed power grid.

Claims

1. A power conditioner for supplementing a main reference AC power with a DC power generated by a DC power source, the power conditioner comprising:

a pulse width modulator to change tne generated DC power into a modulated AC power;

at least one analog to digital converter to digitalize at least one characteristic of the main reference AC power and of the modulated AC power; and

a micro-controller processor, which utilizes the digitalized characteristics to calculate at least one operational parameter of the main reference AC power to which parameter the modulated AC power will be adapted.

2. The power conditioner according to claim 1, further comprising:

an adaptive filter which changes the modulated AC power, under the control of the micro-controller processor, to match the main reference AC power.

3. The power conditioner according to claim 1, further comprising:

a circuit breaker capable of isolating the power conditioner from the main reference AC power.

4. The power conditioner according to claim 1, further comprising:

at least one memory for storage of the at least one operational parameter and which the micro-controller processor can access.

5. The power conditioner according to claim 1, further comprising:

at least one power supply unit capable of supplying power to at least one of a battery, a battery charger, the at least one analog to digital converter and the micro-controller processor.

6. The power conditioner according to claim 1, further comprising:

a battery which can supply power to the micro-processor in the event of the main reference AC power isolation or failure.

7. The power conditioner according to claim 1, further comprising:

an electricity meter from which data relating to at least the usage of power can be gathered by the micro-controller processor.

8. The power conditioner according to claim 1, wherein the pulse width modulator together with an adaptive filter are of a modular construction such that a wattage of the power conditioner can be changed by one of an addition or a substitution of the module.

9. The power conditioner according to claim 1, wherein access to control of the power conditioner can be accomplished through at least one of a serial communications port, an infrared port, an Ethernet port, a modem, and a DSL/ADSL.

10. The power conditioner according to claim 1, wherein a matching of the modulated AC power is within +−

one degree of phase to the main reference AC power.

11. The power conditioner according to claim 1, wherein an energy conversion of the DC power to match the main reference AC power is at least 95% efficient.

12. A method of supplementing a main reference AC power with a DC power generated by a DC power source, the method comprising:

digitizing at least one characteristic of the main reference AC power;

modulating the DC power to an AC sine wave power;

digitizing at least one characteristic of the modulated AC power;

calculating, on the basis of the digitized at least one characteristic of each of the main reference AC power and the modulated AC power, at least one operational parameter of the main reference AC power to which the modulated AC power will be set; and

matching the modulated AC power to the at least one calculated operational parameter.

13. The method according to claim 12, further comprising the steps of:

closing a circuit breaker for electrical isolation; and

supplying the matched AC power for supplementation of the main reference AC power.

14. The method according to claim 12, wherein the matched AC power is within +−

one degree of phase to the main reference AC power.

15. The method according to claim 12, wherein an energy conversion of the DC power to match the main reference AC power is at least 95% efficient.

16. The method according to claim 12, further comprising the step of:

metering a flow of at least one of the main reference AC power and the matched AC power to track power usage.

17. The method according to claim 12, further comprising the step of:

storing at least one of the at least one characteristic of the main reference AC power and the at least one characteristic of the modulated AC power in a memory.

18. The method according to claim 12, further comprising the step of:

accessing a micro-controller processor to set at least one of the at least one operational parameter.

19. An electrical power distribution system in which a generated AC power is supplemented, comprising:

an electrical power generating station which generates the AC power;

a sub-transmission and distribution system which distributes the generated AC power; and

a solar power conditioner which converts a DC power to a modulated AC power, matches the modulated AC power to the generated AC power, and supplements the generated AC power with that of the matched modulated AC power,

wherein the modulated AC power is matched to the generated AC Power on the basis of at least one calculated operational parameter of the generated AC power.

20. The electrical power distribution system according to claim 19, wherein the solar power conditioner is inserted into the sub-transmission and distribution system.

21. The electrical power distribution system according to claim 19, wherein the sub-transmission and distribution system further comprises at least one of:

an electrical transmission network; and

a distribution substation.

22. The electrical power distribution system according to claim 21, wherein the solar power conditioner is inserted into the sub-transmission and distribution system by at least one of an insertion into the electrical transmission network and as an addition to the distribution substation.

23. The electrical power distribution system according to claim 19, wherein the solar power conditioner is inserted into the electrical power distribution system in a position that is at least one of before a meter and after a meter.

24. An apparatus for supplementing a main reference AC power with a DC power generated by a DC power source, the apparatus comprising:

means for digitizing at least one characteristic of the main reference AC power and for providing at least one digitized characteristic of the main reference AC power;

means for modulating the DC power to provide modulated AC power;

means for digitizing at least one characteristic of the modulated AC power and for providing at least one digitized characteristic of the modulated AC power;

means for determining, based on the at least one digitized characteristic of each of the main reference AC power and the modulated AC power, at least one operating parameter of the main reference AC power; and

means for matching the modulated AC power to the at least one operating parameter of the main reference AC power.

25. The apparatus of claim 24, wherein the at least one characteristic includes at least one of current, voltage, phase and harmonic current.

26. An apparatus for supplementing a main reference AC power with a DC power generated by a DC power source, the apparatus comprising:

a first digitizing arrangement for digitizing at least one characteristic of the main reference AC power and for providing at least one digitized characteristic of the main reference AC power;

a modulating arrangement for modulating the DC power to provide modulated AC power;

a second digitizing arrangement for digitizing at least one characteristic of the modulated AC power and for providing at least one digitized characteristic of the modulated AC power;

a determining arrangement for determining, based on the at least one digitized characteristic of each of the main reference AC power and the modulated AC power, at least one operating parameter of the main reference AC power; and

a matching arrangement for matching the modulated AC power to the at least one operating parameter of the main reference AC power.

27. The apparatus of claim 26, wherein the at least one characteristic includes at least one of current, voltage, phase and harmonic current.

28. A power conditioner for supplementing a main reference AC power with a DC power generated by a DC power source, the power conditioner comprising:

means for pulse-width modulating the generated DC power to provide a modulated AC power;

means for digitizing at least one characteristic of the main reference AC power and of the modulated AC power for providing digitized characteristics; and

means for using the digitized characteristics to determine at least one operating parameter of the main reference AC power to filter adaptively the modulated AC power for matching the main reference AC power.

29. The power conditioner of claim 28, wherein the at least one characteristic includes at least one of current, voltage, phase and harmonic current.

30. The power conditioner of claim 28, wherein the at least one characteristic includes current, voltage, phase and harmonic current.