System and method for an array of intelligent inverters

• US 20090283129A1
• Filed: 05/14/2009
• Published: 11/19/2009
• Est. Priority Date: 05/14/2008
• Status: Abandoned Application

• Current Assignee: National Semiconductor Corporation (Texas Instruments, Inc.)
• Original Assignee: National Semiconductor Corporation (Texas Instruments, Inc.)
• Inventors: Foss, Andrew
• Application Number:
  US12/454,244
• Publication Number:
  US 20090283129A1
• Time in Patent Office: Days
• US Class Current: 136/244
• CPC Class Codes: H02M 1/0043 Converters switched with a phase shift, i.e. interleaved non-isolated DC/DC converters H02M3/1586
• CPC Class Codes: H02M 7/493 the static converters being arranged for operation in parallel

Abstract

A system and method for DC to AC conversion in a power generating array. The system and method includes a number of inverters coupled to a group of solar panels. A group controller coordinates operation of the inverters for interleaved switching of the inverters. The group controller communicates via a local area network, a wireless network, or both, to coordinate operation with additional groups of inverters coupled in parallel with additional solar panels.

Claims

1. An energy conversion array for use in an energy generating system, the array comprising:

a plurality of inverters adapted to receive a direct current energy and output an alternating current energy, wherein an output of a first inverter is interleaved with an output of a second inverter.

2. The array as set forth in claim 1, wherein the plurality of inverters is adapted to couple to at least one of a solar energy generating system, wind energy generation system, geothermal energy generation system, and a water based energy generating system.

3. An energy conversion array for use in an energy generating system, the array comprising:

a plurality of intelligent inverters adapted to receive a direct current energy and output an alternating current energy, the plurality of inverters configured to perform power band optimization.

4. The array as set forth in claim 3, further comprising a plurality of sensors configured to measure a value from of each of a plurality of energy generating devices, said value corresponding to at least one of temperature, output current and output voltage.

5. The array as set forth in claim 4, further comprising a group controller coupled to a number of the plurality of inverters, wherein the group controller is configured to use the value received from the plurality of sensors to vary an operation of at least one of the plurality of inverters.

6. The array as set forth in claim 5, wherein the group controller is configured to transmit data to a remote controller and is responsive to commands received from said remote controller.

7. The array as set forth in claim 3, further comprising a group controller configured to:

measure a power output of the plurality of inverters;

compare the measured power to at least one of an upper limit of an optimum power band and a lower limit of the optimum power band;

enable at least one additional inverter in response to a determination that the measured power exceeds the upper limit; and

disable at least one inverter in response to a determination that the measured power is lower than the lower limit.

8. An energy conversion array for use in an energy generating system, the array comprising:

a plurality of solar power generating devices; and

a plurality of inverters, each of the plurality of inverters adapted to receive a direct current energy from one of the plurality of solar power generating devices and output an alternating current energy, wherein an output of a first inverter is interleaved with an output of a second inverter.

9. The array as set forth in claim 8, wherein each of the plurality of solar power generating devices comprises one of a solar panel, a string of solar panels, and a plurality of strings of solar panels coupled in parallel.

10. An energy conversion array for use in a solar power system, the array comprising:

a plurality of solar power generating devices; and

a plurality of inverters coupled to the plurality of power generating devices, the plurality of inverters configured to receive a non-regulated direct current energy and coordinate an output of an alternating current energy.

11. The array as set forth in claim 10, further comprising a plurality of controllers coupled to the plurality of inverters.

12. The array as set forth in claim 11, wherein the plurality of controllers are configured to communicate via a local area network connection.

13. The array as set forth in claim 11, wherein the plurality of controllers are configured to transmit data to a remote controller.

14. The array as set forth in claim 10, wherein the plurality of controllers are configured to:

measure a power output of the plurality of inverters;

compare the measured power to at least one of an upper limit of an optimum power band and a lower limit of the optimum power band;

enable at least one additional inverter in response to a determination that the measured power exceeds the upper limit; and

disable at least one inverter in response to a determination that the measured power is lower than the lower limit.

15. The array as set forth in claim 10, wherein the plurality of inverters are configured to perform a power optimization of the alternating current energy.

16. The array as set forth in claim 10, wherein the plurality of inverters are configured to interleave outputs of the alternating current energy.

17. The array as set forth in claim 10, wherein the solar power generating device is one of a solar panel, a string of solar panels, and a plurality of strings of solar panels coupled in parallel.

18. A method for current conversion for a power array, the method comprising:

receiving, by a plurality of inverters, electrical energy from a plurality of energy generation devices;

coordinating a switching of the plurality of inverters to perform a conversion of a direct current energy to an alternating current energy by the plurality of inverters.

19. The method set forth in claim 18, measuring a value corresponding to at least one of input current, input voltage, output current, output voltage, solar panel temperature, and solar array temperature.

20. The method as set forth in claim 19, wherein coordinating further comprises varying an operation of the plurality of inverters based on the measured value.

21. The method as set forth in claim 18, further comprising receiving data from at least one of a power demand meter and a controller of a different plurality of inverters, wherein the data includes measurements of at least one of a voltage, a current, and a temperature for at least one solar panel.

22. The method as set forth in claim 21, wherein coordinating further comprises varying an operation of the plurality of inverters based on the received data.

23. The method as set forth in claim 18, further comprising transmitting data to at least one of a remote controller and a second controller of a different plurality of inverters, wherein the data includes measurements of at least one of a voltage, a current, and a temperature for at least one solar panel.

24. The method as set forth in claim 18, wherein coordinating comprises:

measuring a power output of the plurality of inverters;

comparing the measured power to at least one of an upper limit of an optimum power band and a lower limit of the optimum power band;

enabling at least one additional inverter in response to a determination that the measured power exceeds the upper limit; and

disabling at least one inverter in response to a determination that the measured power is lower than the lower limit.