Distributed Generation Power System

• US 20100191489A1
• Filed: 01/28/2009
• Published: 07/29/2010
• Est. Priority Date: 01/28/2009
• Status: Abandoned Application

• Current Assignee: UQM Technologies, Inc. (Danfoss A/S)
• Original Assignee: UQM Technologies, Inc. (Danfoss A/S)
• Inventors: ZOLOT, Matthew D.
• Application Number:
  US12/361,475
• Publication Number:
  US 20100191489A1
• Time in Patent Office: Days
• US Class Current: 702/62
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers

Abstract

A distributed generation power system includes a utility meter connectable to an electric utility provider and configured to communicate with a communication device of the utility provider, an inverter configured to convert distributed generation (DG) power generated by a DG power source into AC power, and an intermediate connector configured to connect the meter and inverter to constitute an integrated inverter-meter. The integrated inverter-meter is configured to communicate a measured aggregate amount of the DG power and a measured amount of power consumed on site to the communication device of the utility provider. The inverter is configured to receive at least one operating command from the meter and/or the communication device of the utility provider. The integrated inverter-meter is configured to alter a control parameter of the operating state of the inverter in accordance with the operating command, and to alter an operating state of the DG power source and/or at least one load connectable to the site.

Claims

1. A distributed generation power system comprising:

a utility meter connectable to an electric utility provider, and configured to communicate with a communication device of the utility provider;

an inverter configured to convert distributed generation power generated by a distributed generation power source into AC power; and

an intermediate connector configured to connect the meter and inverter to constitute an integrated inverter-meter, wherein;

the integrated inverter-meter is configured to

measure an aggregate amount of the distributed generation power generated by the distributed generation power source, and measure an aggregate amount of power consumed at a site at which the integrated inverter-meter is installed, and

communicate the measured aggregate amount of the distributed generation power and the measured aggregated amount of power consumed at the site to the communication device of the utility provider;

the inverter in the integrated inverter-meter is configured to receive at least one operating command from at least one of the meter, and the communication device of the utility provider via the meter;

the integrated inverter-meter is configured to alter a control parameter of the operating state of the inverter in accordance with the received at least one operating command, and to alter an operating state of at least one of the distributed generation power source and at least one load connectable to the site, in accordance with a contractual relationship between the utility provider and an entity controlling the distributed generation power system, based on the received at least one operating command.

2. The distributed generation power system of claim 1, wherein the inverter is configured to correct a power factor of the at least one load connectable to the site, based on a communicated measurement of the power factor from at least one of the meter and the communication device of the utility provider.

3. The distributed generation power system of claim 1, wherein the distributed generation power source is one of installed at the site at which the integrated inverter-meter is installed, and installed at a facility external to the site at which the integrated inverter-meter is installed.

4. The distributed generation power system of claim 1, wherein the meter in the integrated inverter-meter is configured to disconnect at least one load at the site, and to maintain a connection with the utility provider for injection of a predetermined amount of the distributed generation power into the utility grid, independent of whether at least one power terminal of the meter is connected to the utility provider to receive AC source power from the utility grid.

5. The distributed generation power system of claim 4, wherein the inverter is configured to supply auxiliary power to at least one auxiliary load through an auxiliary contact between the integrated inverter-meter and the at least one auxiliary load, when the integrated inverter-meter disconnects the at least one load at the site.

6. The distributed generation power system of claim 1, wherein the integrated inverter-meter is configured to disconnect from the utility grid upon determining that injection of the distributed generation power into the utility grid would be unsafe.

7. The distributed generation power system of claim 6, wherein the integrated inverter-meter is configured to determine that injection of the distributed generation power into the utility grid would be unsafe when at least one of the integrated inverter-meter receives a communication of unsafe conditions from the communication device of the utility provider, and the integrated inverter-meter is unable to establish communication with the communication device of the utility provider.

8. The distributed generation power system of claim 1, wherein the integrated inverter-meter is configured to control automation of at least one of the distributed generation power source, at least one connection of AC source power from the utility grid, and the at least one load in accordance with a communication protocol between the integrated inverter-meter and the distributed generation power source, the communication device of the utility grid, and the at least one load, respectively.

9. The distributed generation power system of claim 8, wherein the integrated inverter-meter comprises a communication interface configured to connect to an external network to receive an automation command for controlling the automation of at least one of the distributed generation power source, the at least one connection of AC source power from the utility grid, and the at least one load.

10. The distributed generation power system of claim 9, wherein the external network is the Internet.

11. The distributed generation power system of claim 8, wherein the integrated inverter-meter comprises a user interface configured to receive an automation command from a user for controlling the automation of at least one of the distributed generation power source, the at least one connection of AC source power from the utility grid, and the at least one load.

12. The distributed generation power system of claim 8, wherein the automation includes programming between on and off of at least one of the distributed generation power source, the at least one connection of AC source power from the utility grid, and the at least one load.

13. The distributed generation power system of claim 1, wherein:

the at least one load is a plug-in vehicle being configured to at least one of (i) be powered by the distributed generation power and powered by AC source power from the utility grid, and (ii) store power distributed thereto for later consumption; and

the integrated inverter-meter comprises a communication interface configured to connect to an external network to receive an automation command for controlling automation of the plug-in vehicle.

14. The distributed generation power system of claim 13, wherein the plug-in vehicle is at least one of a battery, an electrochemical double layer capacitor, a flywheel, a fuel cell, and an engine driving a generator.

15. The distributed generation power system of claim 1, wherein the operating command instructs the inverter in the integrated inverter-meter to connect or disconnect from the utility grid for at least one of safety precautions, reliability, and anti-islanding.

16. The distributed generation power system of claim 1, wherein the contractual relationship between the utility provider and the entity includes:

the entity being charged a first rate for consumption of AC source power received at the integrated inverter-meter from the utility grid;

the entity being credited a second rate approximate or equal to the first rate for injection of the distributed generation power into the utility grid;

the entity being credited a third rate, which is greater than the first and second rates, when the entity at least partially disconnects from receiving the AC source power from the utility provider during a time in which a cost to the utility provider is a fourth rate, which is greater than the first, second and third rates, for obtaining additional AC source power to be supplied to consumers of the utility provider.

17. The distributed generation power system of claim 4, wherein the contractual relationship between the utility provider and the entity includes:

the entity being charged a first rate for consumption of AC source power received at the integrated inverter-meter from the utility grid;

the entity being credited a second rate approximate or equal to the first rate for injection of the distributed generation power into the utility grid;

the entity being credited a third rate, which is greater than the first and second rates, when the entity at least partially disconnects from receiving the AC source power from the utility provider during a time in which a cost to the utility provider is a fourth rate, which is greater than the first, second and third rates, for obtaining additional AC source power to be supplied to consumers of the utility provider.

18. The distributed generation power system of claim 1, wherein the integrated inverter-meter is configured to determine a difference between the measured aggregate amount of the distribution generation power and the measured aggregate amount of the power consumed at the site, and communicate the determined difference to the communication device of the utility provider.

19. A distributed generation power system comprising:

a utility meter connectable to an electric utility provider, and configured to communicate with a communication device of the utility provider; and

an inverter connected to the utility meter, the inverter comprising

a converter configured to convert distributed generation power generated by a distributed generation power source into AC power,

a communication unit configured to communicate with the utility meter, and to receive at least one operating command from at least one of the meter and the communication device of the utility provider via the meter, and

a control unit configured to alter a control parameter of an operating state of at least one of the inverter and the utility meter in accordance with the received at least one operating command.

20. The distributed generation system of claim 19, further comprising an intermediate connector configured to connect the meter and the inverter to constitute an integrated inverter-meter, wherein:

the inverter is connected to cabling terminals including at least one source terminal for receiving at least one of the distributed generation source power and AC source power from the utility provider, and a load terminal for supplying at least one of the distributed generation source power and the AC power to a load at a side at which the inverter and meter are installed, and for supplying the distributed generation source power to the utility provider; and

the intermediate connector is configured to route at least one power terminal of the inverter to at least one of (i) the source terminal of the cabling terminals, (ii) the load terminal of the cabling terminals, and (ii) at least one power terminal of the meter.

21. The distributed generation system of claim 20, wherein the meter is configured to disconnect at least one load at the site, and to maintain a connection with the utility provider for injection of a predetermined amount of the distributed generation power into the utility grid, independent of whether the at least one power terminal of the meter is connected to the utility provider to receive AC source power from the utility grid.

22. The distributed generation system of claim 20, wherein the integrated inverter-meter is contained in a single enclosure.

23. The distributed generation system of claim 20, wherein the meter and intermediate connector are contained in a first enclosure, and the inverter is at least partially contained in a second enclosure separated from the first enclosure.

24. The distributed generation system of claim 23, wherein the first and second enclosures are connected to each other by at least one of AC and DC cabling.

25. The distributed generation system of claim 23, wherein the inverter contained in the second enclosure is connected to the intermediate connector contained in the first enclosure by at least one of AC and DC cabling.

26. The distributed generation system of claim 20, wherein the control unit of the inverter and the meter are configured to actively connect and disconnect the at least one power terminal of the inverter via a power switching mechanism.

27. The distributed generation system of claim 20, wherein the intermediate connector is configured to route communication wiring from the inverter to the meter.

28. The distributed generation system of claim 20, wherein the inverter and meter are configured to actively connect and disconnect the source and load terminals of the cabling terminals.

29. The distributed generation system of claim 19, wherein the meter and inverter are connected in series via an AC mains panel including breakers.