Systems and methods for communicating data state change information between devices in an electrical power system

• US 9,620,955 B2
• Filed: 03/15/2013
• Issued: 04/11/2017
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Schweitzer Engineering Laboratories, Incorporated
• Original Assignee: Schweitzer Engineering Laboratories, Incorporated
• Inventors: Dolezilek, David J., Day, Benjamin S., Gammel, Dennis, Bradetich, Ryan, Bennett, Jerry J, Ewing, Christopher
• Primary Examiner(s): Nguyen, Minh-Chau
• Application Number:
  US13/841,260
• Publication Number:
  US 20140280673A1
• Time in Patent Office: 1,488 Days
• Field of Search: 709213
• CPC Class Codes: H02H 1/0061 concerning transmission of signals transmission of measured quantities or switching orders; sectionalised protection involving signal transmission between at least two stations H02H7/261; comparison of the voltage or current values at two spaced portions of a single system H02H3/28; transferring the output of a sensing member to another variable G01D5/00; electrical measuring arrangements using modulation of electromagnetic waves, e.g. light beams G01R15/24, G01R15/26
• CPC Class Codes: H02H 7/261 involving signal transmission between at least two stations transmission of signals in general H02H1/0061
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching

Abstract

Systems and methods are presented for managing communication between devices in an electric power generation and delivery system. In certain embodiments, a method for managing communication messages performed by a network device included in an electric power generation and delivery system may include receiving a message including an identifier and data state information via a communications interface. A determination may be made that that the message represents a data state change associated with the identifier. The message may be stored in a message buffer associated with the identifier. Finally, the stored message may be transmitted from the message buffer to an intelligent electronic device.

Claims

1. A method for managing communication messages comprising:

a network device receiving via a communications interface a message included in a multi-cast message stream from a first intelligent electronic device (IED), the message including information identifying a publishing IED and data state information;

the network device determining, using a processor included in the network device, that the message represents a data state change associated with the publishing IED based on a state of a data state change indicator included in the message, the state of the data state change indicator providing an indication of whether the message represents a data state change relative to a prior message;

the network device storing the message in a message buffer associated with the information identifying the publishing IED;

the network device placing the stored message in an output message queue; and

the network device prioritizing the stored message according to a message queue priority designation and transmitting the stored message to a second IED from the output message queue using the communications interface based on the message queue priority designation, the second IED being separate from the network device and being configured to engage in at least one control action based on the transmitted stored message.

2. The method of claim 1, wherein the method further comprises:

prior to storing the message, determining whether the message buffer is full; and

if the message buffer is full, at least partially purging the message buffer.

3. The method of claim 1, wherein the data state change indicator comprises a data state change indicator bit included in the message.

4. The method of claim 1, wherein the information identifying the publishing IED comprises a subscription identifier.

5. The method of claim 1, wherein the message comprises an IEC 61850 Generic Object Oriented Substation Events (GOOSE) message.

6. The method of claim 1, wherein the stored message is placed in the output message queue based, at least in part, on the order in which the message was received by the network device.

7. The method of claim 1, wherein the communications interface comprises a wireless communications interface.

8. The method of claim 1, wherein the message queue priority designation is based on the information identifying the publishing IED.

9. The method of claim 1, wherein the message queue priority designation is based on a type of the data state change represented by the contents of the message.

10. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor of a network device for managing communication messages, cause the processor of the network device to:

receive via a communication interface a message included in a multi-cast message stream from a first intelligent electronic device (IED), the message including information identifying a publishing IED and a data state indicator, the state of the data state change indicator providing an indication of whether the message represents a data state change relative to a prior message;

determine, using the processor included in the network device, that the message represents a data state change associated with the publishing IED;

store the message in a message buffer associated with the information identifying the publishing IED;

place the stored message in an output message queue;

prioritize the stored message according to a message queue priority designation; and

transmit the stored message from the output message queue of the network device to a second IED using the communications interface based on the message queue priority designation, the second IED being separate from the network device and being configured to engage in at least one control action based on the transmitted stored message.

11. The non-transitory computer-readable storage medium of claim 10, wherein the data state change indicator comprises a data state change indicator bit included in the message.

12. The non-transitory computer-readable storage medium of claim 10, wherein the information identifying the publishing IED comprises a subscription identifier.

13. The non-transitory computer-readable storage medium of claim 10, wherein the message comprises a GOOSE message.

14. The non-transitory computer-readable storage medium of claim 10, wherein the stored message is placed in the output message queue based, at least in part, on the order in which the message was received by the network device.

15. A network device for managing communication messages in a network comprising:

a network interface receiving and transmitting a multi-cast message stream between a first intelligent electronic device (IED) and a second IED separate from the network device;

a computer processor determining that a message included in the multi-cast message stream from the first IED represents a data state change associated with a publishing IED based on the state of a data state change indicator included in the message, the state of the data state change indicator providing an indication of whether the message represents a data state change relative to a prior message;

a message buffer storing the message based on the determination made by the computer processor; and

a message output queue receiving the stored message;

wherein the network interface transmitting the stored message to the second IED communicatively coupled to the network interface from the output message queue based a message queue priority designation associated with the stored message, the message queue priority designation being based on a type of the data state change represented by the contents of the message, the second IED being configured to engage in at least one control action based on the stored message.

16. The network device of claim 15, wherein the message comprises a GOOSE message.

17. The network device of claim 15, wherein the network interface is a wireless communications interface.