KR101784408B1 - Time synchronized system - Google Patents

Time synchronized system Download PDF

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KR101784408B1
KR101784408B1 KR1020150167732A KR20150167732A KR101784408B1 KR 101784408 B1 KR101784408 B1 KR 101784408B1 KR 1020150167732 A KR1020150167732 A KR 1020150167732A KR 20150167732 A KR20150167732 A KR 20150167732A KR 101784408 B1 KR101784408 B1 KR 101784408B1
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South Korea
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time
signal
optical signal
synchronizing signal
time synchronization
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KR1020150167732A
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Korean (ko)
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KR20170062208A (en
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손천명
서덕기
김종화
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한전케이디엔주식회사
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R20/00—Setting the time according to the time information carried or implied by the radio signal
    • G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0075—Arrangements for synchronising receiver with transmitter with photonic or optical means

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Signal Processing (AREA)
  • Electric Clocks (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

According to an embodiment, there is provided a time synchronization system including a GPS receiver, a master time synchronization signal distribution device, and a slave time synchronization signal distribution device, wherein the GPS receiver receives GPS time synchronization information and transmits the GPS time synchronization information to the master time synchronization signal distribution device The master time synchronizing signal distributing device distributes the received time synchronizing signal to at least one time synchronizing signal receiving device connected to the slave time synchronizing signal distributing device connected with the optical cable and the coaxial cable, The time synchronization signal distributing device or the slave time synchronizing signal distributing device of the preceding stage compensates the delay time of the time synchronizing signal, To distribute to devices It provides a time synchronization system.

Description

[0001] TIME SYNCHRONIZED SYSTEM [

The present invention relates to a time synchronization system, and more particularly, to a time synchronization system applicable to an IEC61850 network.

Time synchronization uses an NTP (Network Time Protocol) server, an SNTP server or satellite (GPS), or a time difference between devices. However, the method using the NTP server or the SNTP server has a problem in that it can not be used without a server on the network because the server requests the current time and the time information in response to the time is adjusted to its own time, There is a problem in that it is limited only in an environment where there is a satellite receiver.

In addition, there is time synchronization using IEEE 1588 (Precision Time Protocol) based communication protocol. In this method, a sync message is transmitted from a master node to a slave node, and this message has estimated time information. Then, a Follow_up message having the correct time information is transmitted to the slave node. The slave node calculates the offset and the correct clock. However, this method provides a high temporal accuracy, but it has a problem in that it is difficult to implement by a complicated time synchronization algorithm because it is expensive to construct.

The IEC 61850-based automation system needs time synchronization to transmit accurate information between power devices. In recent years, the IEC 61850- . In addition, the substation automation system is divided into a station level, a bay level, and a process level for each function, and particularly, a time accuracy as high as a process level is required. Therefore, time synchronization using an IRIG-B time synchronization communication protocol is required in a substation automation system.

SUMMARY OF THE INVENTION The present invention provides a time synchronization system capable of unifying time synchronizing signals in a substation using a single GPS satellite time receiving apparatus and eliminating errors generated by using a plurality of GPS satellite time receiving apparatuses .

It is another object of the present invention to provide a time synchronization system capable of correcting an error caused by transmission distance and signal conversion.

According to one embodiment, there is provided a time synchronization system including a GPS receiver, a master time synchronization signal distribution device, and a slave time synchronization signal distribution device, wherein the GPS receiver receives GPS time synchronization information and transmits the GPS time synchronization information to the master time synchronization signal distribution device The master time synchronizing signal distributing device distributes the received time synchronizing signal to at least one time synchronizing signal receiving device connected to a slave time synchronizing signal distributing device connected by an optical cable and a coaxial cable, The device synchronizes the time synchronization signal with each other via the optical cable and transmits a signal compensating the delay time of the time synchronization signal received from the master time synchronization signal distribution device or the slave time synchronization signal distribution device of the previous stage to a time synchronization signal Distribution to the receiving device It provides a time synchronization system.

The slave time synchronizing signal distributing apparatus comprises: an optical signal input section for receiving a time synchronizing signal as an optical signal; An optical signal output unit for outputting the received optical signal to another slave time synchronizing signal distributor; A photoelectric conversion unit for performing conversion between an optical signal and an electrical signal; A delay time calculating unit for calculating a delay time of the time synchronizing signal; A delay time compensator for converting the optical signal inputted through the photoelectric conversion unit into an electrical signal and compensating the converted electrical signal for the delay time; A signal distributing unit for distributing a time synchronizing signal having a delay time compensated to a connected time synchronizing signal receiving apparatus; A loopback optical signal output unit for outputting a loopback optical signal obtained by converting the electrical signal into an optical signal through the photoelectric conversion unit; And a loopback optical signal input unit receiving the loopback optical signal from the other slave time synchronizing signal distributing apparatus.

The delay time calculator may calculate the delay time using a transmission time of an optical signal, a time required to convert an optical signal into an electrical signal, and a time required to convert an electrical signal into an optical signal.

The delay time calculator may calculate the delay time according to Equation (1).

[Equation 1]

Figure 112015116241915-pat00001

(Where A is the input time of the loopback optical signal and B is the output time of the optical signal output from the previous slave time synchronizing and distributing device).

The time synchronization system of the present invention can unify the time synchronization signals in the substation by using a single GPS satellite time reception device and eliminate an error caused by using a plurality of GPS satellite time reception devices.

In addition, it is possible to correct an error caused by the transmission distance and the signal conversion by itself.

1 is a conceptual diagram of a time synchronization system according to an embodiment of the present invention,
2 is a block diagram of a master time synchronization signal distribution apparatus according to an embodiment of the present invention,
3 is a block diagram of a slave time synchronizing signal distributing apparatus according to an embodiment of the present invention,
4 is a view for explaining the operation of the slave time synchronizing signal distributing apparatus according to the embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

1 is a conceptual diagram of a time synchronization system according to an embodiment of the present invention.

Referring to FIG. 1, a time synchronization system according to an embodiment of the present invention can perform time synchronization of equipment connected to a process bus, which is disposed inside a digital substation.

First, the GPS receiver 10 may receive the GPS time synchronization information and transmit it to the master time synchronization signal distribution device 20. The GPS receiver 10 is connected to the master time synchronization signal distributor 20 via a coaxial cable and can receive GPS time synchronization information from the satellite and transmit it to the master synchronization signal distributor 20. The GPS receiver 10 may be installed inside or outside the digital substation, and one GPS receiver may be installed for each substation.

The master time synchronizing signal distributing apparatus 20 can distribute the received time synchronizing signal to the slave time synchronizing signal distributing apparatus 30 connected with the optical cable and at least one time synchronizing signal receiving apparatus 40 connected by the coaxial cable . The master time synchronizing signal distributing device 20 is connected to the GPS receiver 10 by a coaxial cable and is connected to the slave time synchronizing signal distributing device 30 by an optical cable. A plurality of time synchronizing signal receiving apparatuses 40 are connected to the master time synchronizing signal distributing apparatus 20 through a coaxial cable. The time synchronization signal receiving device 40 may be a device connected to the process bus. The master time synchronizing signal distributing device 20 may be provided with one master time synchronizing signal distributing device for each substation.

2 is a block diagram of a master time synchronization signal distribution apparatus according to an embodiment of the present invention.

2, the master time synchronization signal distribution device 20 includes a time synchronization signal input unit 21, a photoelectric conversion unit 22, a signal distribution unit 23, and a time synchronization signal output unit 24, .

The time synchronization signal input unit 21 receives a time synchronization signal from a GPS receiver connected through a coaxial cable. The input time synchronization signal consists of electrical signals and can be signals such as IRIG-B000, IRIG-B120, 1PPS according to IRIG STANDARD 40-04.

The photoelectric conversion unit 22 can convert the input time synchronizing signal into an optical signal. The photoelectric conversion unit 22 transfers the time synchronization signal converted into the optical signal to the time synchronization signal output unit 24. [

The signal distribution unit 23 transmits the received time synchronization signal to the time synchronization signal reception apparatus. The master time synchronizing signal distributing device 20 is connected to at least one time synchronizing signal receiving device by a coaxial cable, and the signal distributing section 23 distributes the time synchronizing signal inputted to the connected time synchronizing signal receiving device .

The time synchronization signal output section 24 transfers the time synchronization signal converted into the optical signal by the photoelectric conversion section 23 to the slave time synchronization signal distribution device. At this time, the time synchronizing signal output unit 24 records the output time of the time synchronizing signal converted into the optical signal as a time stamp, and transmits it to the slave time synchronizing signal distributing apparatus.

Referring again to FIG. 1, the slave time synchronizing signal distributing device 30 is connected to each other through an optical cable to forward the time synchronizing signal, and is connected to the master time synchronizing signal distributing device 20 or the slave time synchronizing signal distributing device A signal compensating the delay time of the received time synchronizing signal can be distributed to the connected time synchronizing signal receiving apparatus 40. [

The slave time synchronizing signal distributing device 30 may be arranged in series along the arrangement of the process buses in the substation, and may be connected to each other by optical cables to transmit and receive optical signals. At least one time synchronizing signal receiving device 40 is connected to each slave time synchronizing signal distributing device 30 by a coaxial cable.

3 is a block diagram of a slave time synchronizing signal distributing apparatus according to an embodiment of the present invention.

3, the slave clock synchronizing signal distributing apparatus according to an embodiment of the present invention includes an optical signal input unit 31, an optical signal output unit 32, a photoelectric conversion unit 33, a delay time calculating unit 34, A time compensation unit 35, a signal distribution unit 36, a loopback optical signal input unit 37, and a loopback optical signal output unit 38.

First, the optical signal input unit 31 can receive a time synchronization signal as an optical signal. The optical signal input unit 31 can receive the time synchronizing signal as an optical signal from the master time synchronizing signal distributing apparatus or the other slave time synchronizing signal distributing apparatus.

The optical signal output unit 32 can output the received optical signal to another slave time synchronizing signal distributor. The optical signal output section 32 can output the optical signal to the other slave time synchronizing signal distributing device disposed in the direction opposite to the input direction of the optical signal, and records the output time of the output optical signal in the time stamp And output it together.

The photoelectric conversion unit 33 can perform conversion between the optical signal and the electrical signal. The photoelectric conversion unit 33 converts the time synchronizing signal input as an optical signal into an electric signal and transmits the electric signal to the delay time compensator 35. The time synchronizing signal converted into the electric signal is converted into an optical signal again, To the output unit (38).

The delay time calculating section 34 can calculate the delay time of the time synchronizing signal. The delay time calculator 34 can calculate the delay time using the transmission time of the optical signal, the time required to convert the optical signal into the electric signal, and the time required to convert the electric signal into the optical signal. The delay time calculator 34 can calculate the delay time according to the following equation (1), for example.

[Equation 1]

Figure 112015116241915-pat00002

In Equation (1), A represents the input time of the loopback optical signal, and B represents the output time of the optical signal output from the slave time synchronization distributing apparatus at the previous stage.

The delay time compensator 35 may convert the optical signal input through the photoelectric converter 33 into an electrical signal and compensate the delay time for the converted electrical signal. The delay time compensating section 35 can compensate the delay time by adding the delay time calculated by the delay time calculating section 34 to the time synchronizing signal converted into the electric signal.

The signal distribution unit 36 can distribute the time synchronization signal with the delay time compensated to the connected time synchronization signal reception apparatus. The signal distributor 36 may transmit a time synchronization signal having a delay time compensated to at least one time synchronization signal receiver connected through a coaxial cable as an electric signal.

The loopback optical signal input unit 37 can receive the loopback optical signal from the other slave time synchronizing signal distributor. The loopback optical signal input unit 37 may record the input time at which the loopback optical signal is input as a time stamp and forward the delayed time to the delay time calculation unit.

The loopback optical signal output unit 38 can output a loopback optical signal obtained by converting an electrical signal into an optical signal through the photoelectric conversion unit 33. [

4 is a view for explaining the operation of the slave time synchronizing signal distributing apparatus according to the embodiment of the present invention.

Referring to FIG. 4, the optical signal input unit 31 receives a time synchronizing signal A as an optical signal from a first slave time synchronizing signal distributing unit located at the previous stage based on the direction of the time synchronizing signal.

The time synchronizing signal A input to the optical signal input unit 31 is output to the second slave time synchronizing signal distributing apparatus via the optical signal output unit 32.

The photoelectric conversion unit 33 converts the input time synchronizing signal A into an electric signal. The delay time calculating unit 34 and the delay time compensating unit 35 output the compensated time synchronizing signal a 'obtained by compensating the delay time to the time synchronizing signal a converted into the electrical signal to the signal distributing unit 36 do. At this time, the delay time calculating unit 34 and the delay time compensating unit 35 use the input time of the loopback optical signal input from the loopback optical signal input unit and the output time of the optical signal input from the first slave time synchronizing signal distributing unit Delay time calculation and compensation.

The signal distribution unit 36 distributes the compensated time synchronization signal a 'to the connected time synchronization signal reception apparatus and outputs the result.

The loopback optical signal output unit 38 outputs the loopback optical signal A 'obtained by converting the electrical signal into the optical signal through the photoelectric conversion unit 33 to the second slave time synchronizing signal distributing device.

As used in this embodiment, the term " portion " refers to a hardware component such as software or an FPGA (field-programmable gate array) or ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

10: GPS receiver
20: Master time synchronization signal distributing device
30: Slave time synchronization signal distribution device
31: Optical signal input section
32: Optical signal output section
33: Photoelectric conversion section
34: delay time calculating section
35: delay time compensator
36: Signal distribution section
37: Loopback optical signal input section
38: Loopback optical signal output section
40: Time synchronization signal receiving device

Claims (4)

1. A time synchronization system including a GPS receiver, a master time synchronization signal distribution device and a slave time synchronization signal distribution device,
The GPS receiver receives GPS time synchronization information and transmits it to the master time synchronization signal distribution apparatus,
The master time synchronizing signal distributing device distributes the received time synchronizing signal to at least one time synchronizing signal receiving device connected to the slave time synchronizing signal distributing device connected by an optical cable and the coaxial cable,
The slave time synchronizing signal distributing device is connected to each other via an optical cable to forward the time synchronizing signal and compensates the delay time of the time synchronizing signal received from the master time synchronizing signal distributing device or the slave time synchronizing signal distributing device at the previous stage Distributes the signal to the connected time synchronization signal receiving apparatus,
Wherein the slave time synchronizing signal distributing device comprises:
An optical signal input unit for receiving a time synchronization signal as an optical signal;
An optical signal output unit for outputting the received optical signal to another slave time synchronizing signal distributor;
A photoelectric conversion unit for performing conversion between an optical signal and an electrical signal;
A delay time calculating unit for calculating a delay time of the time synchronizing signal;
A delay time compensator for converting the optical signal inputted through the photoelectric conversion unit into an electrical signal and compensating the converted electrical signal for the delay time;
A signal distributing unit for distributing a time synchronizing signal having a delay time compensated to a connected time synchronizing signal receiving apparatus;
A loopback optical signal output unit for outputting a loopback optical signal obtained by converting the electrical signal into an optical signal through the photoelectric conversion unit; And
And a loopback optical signal input section for receiving a loopback optical signal from the other slave time synchronization signal distribution device. delete The method according to claim 1,
The delay time calculator calculates the delay time using a transmission time of an optical signal, a time required to convert an optical signal into an electrical signal, and a time required to convert an electrical signal into an optical signal. 4. The time synchronization system according to claim 3, wherein the delay time operation unit calculates the delay time according to Equation (1).
[Equation 1]
Figure 112015116241915-pat00003

(Where A is the input time of the loopback optical signal and B is the output time of the optical signal output from the slave time synchronization distributing device in the previous stage)
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Publication number Priority date Publication date Assignee Title
WO2020204212A1 (en) * 2019-03-29 2020-10-08 인텍전기전자 주식회사 Satellite antenna integrated time-synchronization device

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KR102380137B1 (en) * 2020-05-25 2022-03-29 한전케이디엔주식회사 Digital electric substation time synchronization system and method
CN113341686B (en) * 2021-07-02 2022-05-13 长沙学院 Single-satellite multi-calendar timing method and device, computer equipment and storage medium

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101435181B1 (en) * 2013-10-18 2014-09-01 한전케이디엔주식회사 Time synchronization and transmission delay time correction method between the master and the slave of intelligent power distribution system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101435181B1 (en) * 2013-10-18 2014-09-01 한전케이디엔주식회사 Time synchronization and transmission delay time correction method between the master and the slave of intelligent power distribution system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020204212A1 (en) * 2019-03-29 2020-10-08 인텍전기전자 주식회사 Satellite antenna integrated time-synchronization device

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