Masterless distributed power transfer control

• US 10,291,028 B2
• Filed: 07/29/2016
• Issued: 05/14/2019
• Est. Priority Date: 07/29/2016
• Status: Active Grant

• Current Assignee: Cummins Power Generation IP, Inc.
• Original Assignee: Cummins Power Generation IP, Inc.
• Inventors: Novak, Andrew, Aufderhar, Kevin J., Dahlen, Paul R.
• Primary Examiner(s): Borroto, Alfonso Perez
• Assistant Examiner(s): Yeshaw, Esayas G
• Application Number:
  US15/223,653
• Publication Number:
  US 20180034278A1
• Time in Patent Office: 1,019 Days
• CPC Class Codes: H02J 13/00017 using optical fiber
• CPC Class Codes: H02J 2203/10 Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
• CPC Class Codes: H02J 2213/10 using simultaneously two or more different transmission means
• CPC Class Codes: H02J 2300/10 The dispersed energy generation being of fossil origin, e.g. diesel generators
• CPC Class Codes: H02J 2300/20 The dispersed energy generation being of renewable origin
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks
• CPC Class Codes: H02J 3/0012 Contingency detection
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the generators, converters, or transformers
• 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: Y02E 40/70 Smart grids as climate change mitigation technology in the energy generation sector
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/123 the energy generation units being or involving renewable energy sources
• CPC Class Codes: Y04S 40/124 using wired telecommunication networks or data transmission busses

Abstract

A method of power transfer control among a plurality of power sources coupled through a distribution system. The method comprises determining, at each power source of the plurality of power sources, an assignment of priorities for each of the plurality of power sources. The method also comprises obtaining, at each power source, information indicating an availability of each of the plurality of power sources and determining a set of available power sources, and identifying, at each power source, a preferred power source and a standby power source from the plurality of power sources. The method further comprises determining to change the preferred power source from a first power source to a second power source in response to detecting a condition, and conducting the power transfer.

Claims

1. A method of power transfer control among a plurality of power sources coupled through a distribution system, each of the power sources having a controller, the method comprising:

determining, at the controller of each of the plurality of power sources, an assignment of priorities for each of the plurality of power sources, wherein the priorities establish a hierarchy of the power sources for supplying power to a load;

obtaining, at the controller of each power source, information indicating an availability of each of the plurality of power sources and determining a set of available power sources from among the plurality of power sources based on the information;

identifying, at the controller of each power source, a preferred power source and a standby power source from the plurality of power sources based on the priorities and the information, wherein the preferred power source and the standby power source are among the set of available power sources, and wherein the priority of the preferred power source is higher than the priority of the standby power source;

determining, at the controller of each power source, to change the preferred power source from a first power source to a second power source in response to detecting a condition; and

conducting, at the controller of the first power source and the second power source, a power transfer between the first power source and the second power source in response to determining to change the preferred power source to the second power source.

2. The method of claim 1, wherein conducting the power transfer comprises:

determining that the power transfer is an open transition type;

disconnecting the first power source from the load; and

connecting the second power source to the common load bus after disconnecting the first power source.

3. The method of claim 2, wherein conducting the power transfer further comprises:

starting the second power source, wherein the second power source is a generator set;

monitoring an output voltage of the second power source; and

connecting the second power source with the load in response to the output voltage reaching a predetermined output voltage.

4. The method of claim 1, wherein conducting the power transfer comprises:

determining that the power transfer is a closed transition type;

connecting the second power source to the load; and

disconnecting the first power source from the load after the second power source is connected to the load for a period of time.

5. The method of claim 4, wherein conducting the power transfer further comprises:

synchronizing an output voltage of the second power source to an output voltage of the first power source; and

connecting the second power source to the load in response to the synchronization being achieved.

6. The method of claim 5, wherein the period of time is in a range of less than one second to three minutes.

7. The method of claim 5, wherein the period of time is in a range of ten milliseconds to one hundred milliseconds.

8. The method of claim 1, wherein the first power source includes a first load sharing profile corresponding to a first load level, and wherein the second power source includes a second load sharing profile corresponding to a second load level.

9. The method of claim 1, wherein the first power source includes a first set of parameters of generator sets corresponding to a first load level corresponding to a first load bus, and wherein the second power source includes a second set of parameters of generators sets corresponding to a second load bus.

10. The method of claim 1, wherein the first power source includes a first configuration of a set of generator sets, and wherein the second power source includes a second configuration of the set of generator sets.

11. The method of claim 1, wherein the plurality of power sources include at least one of a solar power source and a wind power source, and wherein the condition includes at least one of a sunlight power density and a wind power density.

12. The method of claim 1, wherein the condition includes at least one of an amount of runtime for a generator set, and a wear condition of the generator set.

13. An apparatus, comprising:

a circuitry configured to;

determine an assignment of priorities for each of a plurality of power sources coupled through a distribution system, wherein the priorities establish a hierarchy of the power sources for supplying power to a load;

obtain information indicating an availability of each of the plurality of power sources and determine a set of available power sources from among the plurality of power sources based on the information;

identify a preferred power source and a standby power source from the plurality of power sources based on the priorities and the information, wherein the preferred power source and the standby power source are among the set of available power sources, and wherein the priority of the preferred power source is higher than the priority of the standby power source;

determine to change the preferred power source from a first power source to a second power source in response to detecting a condition;

determine whether the apparatus is either of the first power source or the second power source; and

conduct a power transfer between the first power source and the second power source in response to both determining to change the preferred power source to the second power source and determining the apparatus is either the first power source or on the second power source.

14. The apparatus of claim 13, wherein in response to determining to change the preferred power source to the second power source and determining the apparatus is the second power source, the circuitry is further configured to:

determine that the power transfer is an open transition type; and

connect the second power source to the load after the first power source is disconnected from the load.

15. The apparatus of claim 14, wherein in response to determining to change the preferred power source to the second power source and determining the apparatus is the second power source, the circuitry is further configured to:

start the second power source, wherein the second power source is a generator set;

monitor an output voltage of the second power source; and

connect the second power source with the load in response to the output voltage reaching a predetermined output voltage.

16. The apparatus of claim 13, wherein the circuitry is on the first power source and further configured to:

determine that the power transfer is a closed transition type;

disconnect the first power source from the load after the second power source is connected to the load for a period of time.

17. The apparatus of claim 13, wherein the circuitry is on the second power source and further configured to:

determine that the power transfer is a closed transition type;

synchronize an output voltage of the second power source to an output voltage of the first power source; and

connect the second power source to the load in response to the synchronization being achieved.

18. The apparatus of claim 17, wherein the period of time is in a range of less than one second to three minutes, or in a range of ten milliseconds to one hundred milliseconds.

19. A generator set, comprising:

an engine;

a generator driven by the engine to generate electrical power; and

a controller communicably coupled to the engine and configured to;

determine an assignment of priorities for each of a plurality power sources coupled through a distribution system, the plurality of power sources comprising the generator set, wherein the priorities establish a hierarchy of the power sources for supplying power to a load;

obtain information indicating an availability of each of the plurality of power sources and determining a set of available power sources from among the plurality of power sources based on the information;

identify a preferred power source and a standby power source from the plurality of power sources based on the priorities and the information, wherein the preferred power source and the standby power source are among the set of available power sources, and wherein the priority of the preferred power source is higher than the priority of the standby power source;

determine to change the preferred power source from a first power source to a second power source in response to detecting a condition;

determine if the generator set is either of the first power source or the second power source; and

conduct a power transfer between the first power source and the second power source in response to both determining to change the preferred power source to the second power source and determining the generator set is the first power source or the second power source.

20. The system of claim 19, further comprising a communication interface comprising at least one of a modem, a network interface card (NIC), or a wireless transceiver, the communication interface structured to allow the generator set to communication with others of the plurality of power sources.

21. The system of claim 19, wherein the generator set is the second power source, and wherein the controller is further configured to:

determine that the power transfer is an open transition type;

start the second power source after the first power source is disconnected from the load;

monitor an output voltage of the new preferred power source; and

connect the second power source with the load in response to the output voltage reaching a predetermined output voltage.

22. The system of claim 19, wherein the generator set is the first power source, and wherein the controller is further configured to:

determine that the power transfer is a closed transition type;

disconnect the first power source from the load after the second power source is connected to the load for a period of time.

23. The system of claim 19, wherein the generator set is the second power source, and wherein the controller is further configured to:

determine that the power transfer is a closed transition type;

synchronize an output voltage of the second power source to an output voltage of the first power source; and

connect the new preferred power source with the load in response to the synchronization being achieved.

24. The system of claim 23, wherein the period of time is in a range of less than one second to three minutes, or in a range of ten milliseconds to one hundred milliseconds.