CN108270503A - Differential protection sample-synchronous based on EPON communications realizes system and method - Google Patents
Differential protection sample-synchronous based on EPON communications realizes system and method Download PDFInfo
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- CN108270503A CN108270503A CN201710650621.8A CN201710650621A CN108270503A CN 108270503 A CN108270503 A CN 108270503A CN 201710650621 A CN201710650621 A CN 201710650621A CN 108270503 A CN108270503 A CN 108270503A
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- differential protection
- epon
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- synchronous
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention is disclosed a kind of differential protection sample-synchronous to be communicated based on EPON and realizes System and method for, which includes EPON system, clock source device, differential protection；The optical network unit (ONU) of optical line terminal (OLT) of the EPON system comprising central side, passive optical splitters (ODN) and user side；Clock source device and OLT, ONU and differential protection are that EPON system is interior to be connected by optical fiber by optical fiber or twisted pair line connection.Signal is to OLT during clock source device transmission pair; OLT and ONU computes and compensates for transmission delay based on IEEE802.1AS mechanism; each ONU to differential protection connected to it by IRIG B codes or pulse per second (PPS) pair when, pass through above-mentioned steps realize differential protection between sample-synchronous.The present invention is based on IEEE802.1AS clock synchronization mechanisms, and differential protection sample-synchronous is realized using EPON network carriers, without be additionally laid with long range pair when line, improve the economy and reliability of differential protection.
Description
Technical field
The invention belongs to distribution protection technical field, more particularly to a kind of differential protection sampling based on EPON communications is same
Step realizes system and method.
Background technology
With the development of intelligent grid, a large amount of distributed generation resource access power distribution networks and power distribution network operation with closed ring so that match
Power grid becomes more power supply complex networks from single supply is radial, and tradition is combined based on stage overcurrent protection or with feeder automation
Troubleshooting pattern be difficult to meet requirement of the intelligent distribution network to the quick-action of protection and selectivity.
It is multiplexed distribution automation ethernet passive optical network (EPON) and realizes multiterminal current differential protection, can efficiently solve
Distribution line protects the problem of quick-action and selectivity.Wherein, synchronizing for sampled data is the key that realize current differential protection,
Document《Intelligent distribution network feeder line differential protection based on EPON communications》It proposes differential using the solution of 1588 synchronous protocols of IEEE
Sample-synchronous problem is protected, and often the EPON equipment and distribution network protection terminal of routine do not have 1588 synchronizing functions of IEEE,
Therefore extra demand EPON equipment, distribution network protection terminal have 1588 synchronizing functions of IEEE, undoubtedly increase the investment of equipment into
This.It is synchronized based on IRIG-B or pulse per second (PPS), has the characteristics that application is wide, reliability is high, existing market mainstream distribution network protection terminal
The synchronization requirement can generally be met.However mode when point-to-point pair is used during IRIG-B codes pair, need clock source and each
Line when protecting equipment point-to-point laying pair since equipment spacing is from short in substation, implements more convenient, and power distribution network
Device distribution is protected in different positions, relatively far away from, therefore directly slave station internal clock source is each protection equipment-laid to distance
If pair when line and unrealistic.
How to be to promote the pass based on the EPON differential protections to communicate using existing resource realization differential protection sample-synchronous
Key.
Invention content
The purpose of the present invention is that providing a kind of differential protection sample-synchronous to communicate based on EPON realizes system and side
Method on the basis of protective device hardware and software cost is not increased, realizes the sampling reliable synchronization between differential protection, improves
The economy and reliability of differential protection.
In order to achieve the above objectives, solution of the invention is：A kind of differential protection sampling based on EPON communications is same
Realization system is walked, including EPON system, clock source device, differential protection；EPON system include optical line terminal, passive point
Light device and optical network unit；Clock source device passes through optical fiber or twisted pair line connection with optical line terminal；Optical network unit with it is differential
Protective device passes through optical fiber or twisted pair line connection；Pass through optical fiber between optical line terminal, passive optical splitters and optical network unit
Connection.
Further, there are one more than optical network units in EPON system.
Further, EPON system can be 1 set can also cover more.In said program, optical network unit and differential guarantor
When protection unit uses IRIG-B pairs or during pulse per second (PPS) pair.
In said program, station internal clock source device pair is realized by clock synchronization mechanism IEEE802.1AS intrinsic EPON
All differential protections connected under optical network unit are synchronized into row clock, so as to fulfill sample-synchronous between differential protection,
It is as follows：
(1) signal realizes optical line terminal and station internal clock source to optical line terminal during internal clock source device of standing transmission pair
The clock of device synchronizes；
(2) optical line terminal computes and compensates for transmission delay based on IEEE802.1AS mechanism with optical network unit,
Realize that the clock between optical line terminal and optical network unit is synchronous；
(3) it when each optical network unit carries out IRIG-B codes or pulse per second (PPS) pair to differential protection connected to it, realizes
Clock between differential protection and optical network unit is synchronous.
In said program, if there are more set EPON equipments in a station, by internal clock source device of standing to all optical links
During terminal-pair, realize that all optical line terminals, optical network unit and protective device are all filled with station internal clock source in more set EPON
Put clock synchronization.
In said program, when clock source device is abnormal or out of service, the differential protection under different EPON systems
Need Blocking Differential Protection；And sampling is still synchronous between the differential protection under same set of EPON, does not influence differential guarantor
Ship sth. under guard row.
The error main source of synchronous method proposed by the present invention：
(1) local time stamp counter of optical line terminal and optical network unit, since timestamp unit is TQ (Time
Quantum), 1TQ is equal to 16ns, so error≤8ns；
(2) error that uplink/downlink optical fiber transmission different wave length introduces, the error is related with optic fibre characteristic and actual wavelength,
Worst error is introduced in greatest physical distance 20km, unidirectional transmission time delay is about 100us, therefore maximum time error is
17ns；
(3) the round-trip transmission delay between optical line terminal and optical network unit, the time of the transmission delay of EPON tolerances
The maximum threshold value of drift is 12TQ, one way 6TQ, i.e. 96ns.
Understand that theoretically worst error is 121ns by analyzing above, it can thus be assumed that IEEE802.1AS EPON clocks are same
Step precision is hundred nanoseconds, meets the Microsecond grade required precision of differential protection requirement.
After using the above scheme, beneficial effects of the present invention are as follows：
(1) using EPON network carriers realize station internal clock long-range transmission, without be laid with long range pair when line, it is poor
The synchronouss IRIG-B code general using electric system of dynamic clock between protective device and optical network unit or pulse per second (PPS) interface, adaptation
Existing protective relaying device pair when interface, do not increase protection equipment hardware and software cost, improve economy and reliability；
(2) precision is hundred nanoseconds when synchronization mechanism ensure that pair, fully meets the synchronization accuracy requirement of differential protection.
Description of the drawings
Fig. 1 is the schematic diagram that a kind of differential protection sample-synchronous to be communicated based on EPON of the present invention realizes system and method.
Specific embodiment
Below with reference to attached drawing, technical scheme of the present invention and advantageous effect are described in detail.
System as shown in Figure 1, it is assumed that there is n to cover independent EPON system in substation, that is, there are a n platform optical line terminals, every
Optical line terminal is set time with several optical network units by passive optical splitters communicate with sampled data transmission respectively.Light
Road terminal is installed in substation, is installed in Standard type, ring main unit or switch room together with optical network unit and protection equipment,
Station in will between clock source device and optical line terminal be laid with pair when line, be laid between each optical network unit and protective device
Pair when line.
Specific implementation step is as follows：
(1) signal gives n platform optical line terminals during the transmission pair of substation station internal clock source device, realizes n platform optical line terminals
It is synchronous with station internal clock source device；
(2) optical line terminal computes and compensates for transmission delay based on IEEE802.1AS mechanism with optical network unit,
It realizes synchronous between optical line terminal and optical network unit；
(3) when each optical network unit carries out IRIG-B codes or pulse per second (PPS) mode pair to differential protection connected to it,
It realizes synchronous between differential protection and optical network unit.
By above-mentioned steps, Relay1~Relayk differential protections are all synchronous with station internal clock source device, differential guarantor
The mutual clock of protection unit is also synchronous.Assuming that Relay1 and Relay2 are 1 both ends differential protection of circuit, Relayi with
Relayj is the both ends differential protection of circuit 2, and Relay1 and Relay2 are connected under same set of EPON equipment, and Relayi with
Relayj is connected under different EPON.When stand internal clock source normal operation when, when Relay1, Relay2, Relayi, Relayj
Clock is synchronous with clock source, therefore sampling is fully synchronized between 4 protective devices, and circuit 1,2 differential protection of circuit can be just
Often operation.And when internal clock source of standing is abnormal or is out of service, present networks are served as by optical line terminal in each EPON system
Master clock, protective device sampling is still synchronous under same set of EPON, and clock generation step-out between two sets EPON, therefore
Step-out occurs for the protective device sampling under different EPON, i.e. it is differential not influence circuit 1 for sample-synchronous between Relay1 and Relay2
The normal operation of protection, and step-out is sampled between Relayi and Relayj, 2 differential protection of circuit takes locking measure.
For realizing differential protection between Relay1, Relay2 differential protection, this two guarantors are observed with oscillograph
The sampling synchronization pulse rising edge of protection unit, worst error is 200ns between two lock-out pulse rising edges, far disclosure satisfy that difference
The synchronization accuracy requirement of dynamic protection Microsecond grade.
It can be seen that by embodiment, a kind of difference to be communicated based on EPON carried from hardware and software cost angle analysis, the present invention
Dynamic protection sample-synchronous is realized to be only increased between station internal clock source and optical line terminal and optical-fiber network list on system hardware
Between member and protective device pair when line, line is very short at these pair, and in addition clock source is original configuration in station, pair when channel answer
EPON network carriers, also without any change on protective device software, therefore it is synchronous method economy of the present invention, feasible；
It is nanosecond from the lock-out pulse worst error between synchronization accuracy angle analysis, differential protection, far meets differential protection
The synchronization accuracy requirement of Microsecond grade.
Above example is merely illustrative of the invention's technical idea, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention
Within.
Claims (7)
1. a kind of differential protection sample-synchronous based on EPON communications realizes system, which is characterized in that including EPON system, clock
Source device and differential protection；The EPON system includes optical line terminal, passive optical splitters and optical network unit；When described
Clock source device passes through optical fiber or twisted pair line connection with optical line terminal；The optical network unit passes through optical fiber with differential protection
Or twisted pair line connection；It is connected between the optical line terminal, passive optical splitters and optical network unit by optical fiber.
2. a kind of differential protection sample-synchronous based on EPON communications as described in claim 1 realizes system, which is characterized in that
There are one more than optical network units in the EPON system.
3. a kind of differential protection sample-synchronous based on EPON communications as described in claim 1 realizes system, which is characterized in that
Including a set of Yi Shang EPON system.
4. a kind of differential protection sample-synchronous based on EPON communications as described in claims 1 to 3 any one realizes system,
It is characterized in that, when using IRIG-B pairs between the optical network unit and the differential protection or during pulse per second (PPS) pair.
5. a kind of differential protection sample-synchronous based on EPON communications as claimed in claim 4 realizes system, which is characterized in that
The system uses IEEE802.1AS time synchronization protocols.
6. a kind of differential protection sample-synchronous based on EPON communications as claimed in claim 5 realizes that the differential protection of system is adopted
Sample synchronization realizing method, which is characterized in that include the following steps：
(1) signal to optical line terminal, realizes that the clock of optical line terminal and clock source device is same during clock source device transmission pair
Step；
(2) optical line terminal computes and compensates for transmission delay based on IEEE802.1AS mechanism with optical network unit, realizes
Clock between optical line terminal and optical network unit is synchronous；
(3) it when each optical network unit carries out IRIG-B codes or pulse per second (PPS) pair to differential protection connected to it, realizes differential
Protection is synchronous with the clock between optical network unit.
7. a kind of differential protection sample-synchronous implementation method based on EPON communications as claimed in claim 6, which is characterized in that
When clock source device is abnormal or out of service, the differential protection under different EPON systems needs Blocking Differential Protection；It is and same
Sampling keeps synchronizing between differential protection under a set of EPON system, and differential protection is not latched.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710650621.8A CN108270503A (en) | 2017-08-02 | 2017-08-02 | Differential protection sample-synchronous based on EPON communications realizes system and method |
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| CN201710650621.8A CN108270503A (en) | 2017-08-02 | 2017-08-02 | Differential protection sample-synchronous based on EPON communications realizes system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110708135A (en) * | 2019-11-15 | 2020-01-17 | 四川中电启明星信息技术有限公司 | Communication control system and method of passive optical network |
| CN111221311A (en) * | 2020-02-26 | 2020-06-02 | 江南大学 | Complex network distributed pulse synchronization method and system based on parameter variational method |
| CN111668800A (en) * | 2020-04-27 | 2020-09-15 | 南京国电南自电网自动化有限公司 | Line differential protection synchronization method and system based on wireless communication and absolute time |
| CN114126028A (en) * | 2020-08-28 | 2022-03-01 | 宸芯科技有限公司 | Differential protection method, device, communication unit and storage medium |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110708135A (en) * | 2019-11-15 | 2020-01-17 | 四川中电启明星信息技术有限公司 | Communication control system and method of passive optical network |
| CN110708135B (en) * | 2019-11-15 | 2021-10-01 | 四川中电启明星信息技术有限公司 | Communication control system and method of passive optical network |
| CN111221311A (en) * | 2020-02-26 | 2020-06-02 | 江南大学 | Complex network distributed pulse synchronization method and system based on parameter variational method |
| CN111221311B (en) * | 2020-02-26 | 2023-02-21 | 江南大学 | Complex network distributed pulse synchronization method and system based on parameter variational method |
| CN111668800A (en) * | 2020-04-27 | 2020-09-15 | 南京国电南自电网自动化有限公司 | Line differential protection synchronization method and system based on wireless communication and absolute time |
| CN114126028A (en) * | 2020-08-28 | 2022-03-01 | 宸芯科技有限公司 | Differential protection method, device, communication unit and storage medium |
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Application publication date: 20180710 |