POINT-TO-POINT COMMUNICATION IN A HIGH VOLTAGE POWER TRANSMISSION SYSTEM

• US 20100150175A1
• Filed: 05/12/2008
• Published: 06/17/2010
• Est. Priority Date: 05/14/2007
• Status: Active Grant

• Current Assignee: Hitachi Energy Limited
• Original Assignee: ABB Technology AG (ABB Limited)
• Inventors: Nyberg, Krister, Björklund, Hans
• Granted Patent: US 8,532,144 B2
• Time in Patent Office: Days
• US Class Current: 370/475
• CPC Class Codes: H02J 13/00016 using a wired telecommunication network or a data transmission bus
• CPC Class Codes: H02J 13/00017 using optical fiber
• CPC Class Codes: H02J 13/00019 using optical means
• CPC Class Codes: H02J 3/36 Arrangements for transfer of electric power between ac networks via a high-tension dc link
• CPC Class Codes: H04J 3/0664 unidirectional timestamps
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02E 60/60 Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
• CPC Class Codes: Y04S 40/124 using wired telecommunication networks or data transmission busses

Abstract

A method for sending signals from an active computer in a high-voltage power transmission system including active protection computers and active and standby control computers in a hierarchical structure having at least two hierarchical levels. A high-voltage power transmission system and a control station for at least a part of such a transmission system. In the system all computers on the various hierarchical levels are connected to at least two separate computer communication networks. An active computer sends signals that are to be received by at least one other computer at the same or another hierarchical level simultaneously on the two separate computer communication networks to which it is connected.

Claims

1. A method of transmitting data related to the control of a high voltage power transmission system, the method comprising:

providing a first frame of data including data symbols according to a frame structure, said frame structure including sections for data symbols containing measurement samples and sections for data symbols containing field bus type of data,

inserting synchronization data into said first frame in the form of control symbols, distinctively separated from the data symbols, and

sending said first frame from a first device to a second device in a point-to-point connection,

wherein said synchronization data provides synchronization of control activities in a process of transmitting power performed in the system by the second device, the data symbols are provided through 8B/10B coding of measurement samples and field bus type data and the control symbols are control symbols of the 8B/10B coding.

2. The method according to claim 1, further comprising:

receiving in a point-to-point connection, with said first device from said second device, a second frame of data including data symbols according to the same frame structure as the first frame has.

3. The method according to claim 1, wherein said synchronization data includes sampling synchronization data indicating when the second device is to take measurement samples in the system.

4. The method according to claim 1, wherein said synchronization data includes time synchronization data for synchronizing the second device with other devices of the same type.

5. The method according to claim 1, wherein frames are provided with fault detection and/or correction code.

6. The method according to claim 1, wherein the first device is a computer for control and/or protection and the second device is a control and measurement node.

7. A first device arranged to transmit data related to control of a high voltage power transmission system to a second device via a point-to-point connection, the first device comprising:

means for providing a first frame of data including data symbols according to a frame structure, said frame structure including sections for data symbols containing measurement samples and sections for data symbols containing field bus type of data,

means for inserting synchronization data into said first frame in the form of control symbols distinctively separated from the data symbols, and

means for sending said first frame,

wherein said synchronization data provides synchronization of control activities in a process of transmitting power to be performed in the system by the second device, the data symbols are provided through 8B/10B coding of measurement samples and field bus type data and the control symbols are control symbols of the 8B/10B coding.

8. The first device according to claim 7, further comprising:

means for receiving, via a point-to-point connection from said second device, a second frame of data including data symbols according to the same frame structure as the first frame has.

9. The first device according to claim 7, wherein said synchronization data includes sampling synchronization data indicating when the second device is to take measurement samples in the system.

10. The first device according to claim 7, wherein said synchronization data includes time synchronization data for synchronizing the second device with other devices of the same type.

11. The first device according to claim 7, wherein the device comprises a computer for control and/or protection and the second device is a control and measurement node.

12. A method of receiving data related to control of a high voltage power transmission system, the method comprising:

receiving, in a point-to-point connection by a second device from a first device, a first frame of data including data symbols according to a frame structure, said frame structure including sections for data symbols containing measurement samples and sections for data symbols containing field bus type of data and into which first frame synchronization data, in the form of control symbols distinctively separated from the data symbols, has been inserted,

extracting said synchronization data from said first frame, and

processing, after said extracting, said first frame for obtaining said data symbols,

wherein said synchronization data provides synchronization of control activities in a process of transmitting power, said control activities being performed in the system by the second device, the data symbols are provided through 8B/10B coding of measurement samples and field bus type data, and the control symbols are control symbols of the 8B/10B coding.

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

providing a second frame of data including data symbols according to the same frame structure as the first frame has, and sending said second frame from the second device to the first device in a point-to-point connection.

14. The method according to claim 12, wherein said synchronization data includes sampling synchronization data indicating when the second device is to take measurement samples in the system.

15. The method according to claim 12, wherein said synchronization data includes time synchronization data for synchronizing the second device with other devices of the same type.

16. The method according to claim 12, wherein the first device is a computer for control and/or protection and the second device is a control and measurement node.

17. A second device arranged to receive data related to the control of a high voltage power transmission system from a first device via a point-to-point connection, the second device comprising:

means for receiving a first frame of data including data symbols according to a frame structure, said frame structure including sections for data symbols containing measurement samples and sections for data symbols containing field bus type of data and into which first frame synchronization data, in the form of control symbols distinctively separated from the data symbols, has been inserted,

means for extracting said synchronization data from said first frame, and

means for processing, after said extracting, said first frame for obtaining said data symbols,

wherein said synchronization data provides synchronization of control activities in a process of transmitting power performed in the system by the second device, the data symbols are provided through 8B/10B coding of measurement samples and field bus type data and the control symbols are control symbols of the 8B/10B coding.

18. The second device according to claim 17, further comprising:

means for providing a second frame of data including data symbols according to the same frame structure as the first frame has, and

means for sending, via a point-to-point connection, said second frame to the first device.

19. The second device according to claim 17, wherein said synchronization data includes sampling synchronization data indicating when the second device is to take measurement samples in the system.

20. The second device according to claim 17, wherein said synchronization data includes time synchronization data for synchronizing the second device with other devices of the same type.

21. The second device according to claim 17, wherein the second device is a control and measurement node and the first device is a computer for control and/or protection.