CN103779963A - Self-adaptive relay protection multi-communication mode intelligent switching apparatus - Google Patents
Self-adaptive relay protection multi-communication mode intelligent switching apparatus Download PDFInfo
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- CN103779963A CN103779963A CN201310698474.3A CN201310698474A CN103779963A CN 103779963 A CN103779963 A CN 103779963A CN 201310698474 A CN201310698474 A CN 201310698474A CN 103779963 A CN103779963 A CN 103779963A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
Abstract
The invention discloses a self-adaptive relay protection multi-communication mode intelligent switching apparatus and belongs to the field of relay protection. The apparatus comprises channel devices for connecting two opposite side protective devices. A first channel switching device and a secodn channel switching device are respectively arranged between a first protective device and the first channel and between a second protective device at the opposite side and a second channel device; the first channel device and the second channel device are respectively correspondingly connected with a center station gateway computer of an intelligent transformer station control layer through a local Ethernet; and when the first channel switching device and the second channel switching device run normally, the operation state of a communication channel keeps being monitored in real time, at the same time, according to monitoring data, equipment operation and channel switching strategies are intelligently decided, and channel switching is performed if necessary. According to the invention, a conventional single-router protection channel is provided with a "double-router" operation characteristic, corresponding photoelectric conversion devices of various protection manufacturers in the prior art are replaced, and the channel equipment reliability is improved. Therefore, the self-adaptive relay protection multi-communication mode intelligent switching apparatus can be wieldy applied to the fields of relay protection and data transmission of an intelligent power network.
Description
Technical field
The invention belongs to the relaying protection field of electric power system, relate in particular to a kind of device for intelligently switching for relay protection multi-communication mode.
Background technology
The develop rapidly of intelligent grid, visual, the real time implementation management of the reliability to relaying protection communication and operation of power networks information, proposed new requirement.
XX area 500KV protection channel extensively adopts optical communication mode (comprising the special core mode of optical fiber and SDH circuit multiplexer mode) at present, but because optical cable condition is limit, most of optical fiber differential protective is in fact still carried on same optical cable.
Although Optical Transmission Network OTN has formed ring-type or network structure, due to the protection mechanism of SDH self, looped network protection switching and path protection are switched and under some particular case, be there will be the inconsistent situation in sending and receiving letter path, can not be applied to optical fiber differential protective.The protection channel of light multiplex mode all takes through optical cable route under normal circumstances, and therefore interruption of optical cables causes circuit to lose de-protected risk being still objective reality.
The indexs such as interface features, pattern, code speed and the frame structure of the optical-fibre channel between current main flow protection equipment and digital multiplex equipment are self-defining by each producer; do not have unified standard; the disunity of optical fiber communication agreement makes the development of relaying protection communication exist significant limitation, is mainly manifested in the following aspects:
(1) the professional boundary between protection and communication is unclear, and Remote protection Equipment and digital multiplex equipment all belong to the equipment of relaying protection specialty, but digital multiplex equipment but needs to be arranged in communications equipment room.Due to different majors, digital multiplex equipment often cannot well be planned when mounted, often can cause the interference to digital multiplex equipment of communication equipment in machine room.Meanwhile, yet Shortcomings aspect fault identification, in the time that communication disruption appears in protection, does not have the means localization of faults, cannot distinguishing protection equipment and the fault of communication equipment, maintenance is put to no little inconvenience.
(2) Remote protection Equipment of different manufacturers and photoelectric conversion device cannot interconnect; when with Optical Fiber Transmission relay protection information; optical fiber interface communication specification between Remote protection Equipment and photoelectric conversion device is often formulated by each relay protection device producer, and only uses on the equipment of oneself.Like this, in a pilot wire relays system, must use Remote protection Equipment and the photoelectric conversion device of same producer, between the equipment of different manufacturers, cannot interconnect.In communication system day by day standardized today, this phenomenon can hinder the application of optical fiber telecommunications system in relay protection information transmission undoubtedly.
(3) transmission channel bandwidth is low or bandwidth availability ratio is low; in relay protection information transmission; applying maximum is 2M passage; for 2M passage; due to the frame structure of channel characteristic and information is not planned well, although make the bandwidth of transmission channel can reach 2Mbit/s, the actual content of transmission is well below 2Mbit/s; a large amount of bandwidth is on the shelf, and bandwidth availability ratio is very low.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of self adaptation relay protection multi-communication mode intelligent switching device, it has solved a difficult problem for same switching device shifter and different manufacturers protection devices interconnect, and can the various communication modes of flexible adaptation, compatibility when having realized harmless switching and transparent transmission, and time delay has been carried out to optimized design; It has taked special abnormality processing means in the time that channel status is abnormal, and has possessed the function of ring diagnosis certainly, for passage dual and channel quality monitoring provide means and approach.
Technical scheme of the present invention is: a kind of self adaptation relay protection multi-communication mode intelligent switching device is provided; comprise the channel unit for connecting two groups of offside protection equipment; described channel unit comprises fiber plant and/or SDH equipment; its the first protection equipment carries out corresponding connection by channel unit with the second protection equipment of offside, it is characterized in that:
Between the first described protection equipment and first passage equipment and between the second protection equipment and second channel equipment of offside, first passage switching device shifter and second channel switching device shifter are set respectively;
First, second described channel unit corresponding connection of central station gateway computer with intelligent substation station level through local ethernet respectively,
When first, second described channel switching device normally moves, keep the real-time monitoring to communication port running status, according to decision device operation and the passage switchover policy of monitor data intelligence, carry out if desired passage switching simultaneously;
Described first passage switching device shifter and second channel switching device shifter make the protection channel of original single route possess " double route " operation characteristic, adopt accurate fractional frequency division to adapt to the data insertion method of arbitrary data code stream, guard signal is sent to offside by the passage of different routes, improve the reliability of channel unit;
First, second described channel switching device completes the function of opto-electronic conversion and channel protocol conversion simultaneously, to replace photoelectric conversion device corresponding to each protection producer at present.
Concrete, accurate fractional frequency division described in it adapts to data insertion method insertion portion control byte in the original protection code stream of 2.048Mb/s of arbitrary data code stream, as the foundation of passage alignment, detection, also can guarantee the transparent transmission of guard signal, solve the compatibling problem of devices from different manufacturers simultaneously;
Described initial data code stream is through after the processing of the method, insert therein the management control byte of regular length and form with the stable time cycle, and send with new transmission frequency, at receiving terminal, track data is detected, to insert byte and propose, reduce initial data code stream and data frequency simultaneously.
The data insertion method that accurate fractional frequency division described in it adapts to arbitrary data code stream comprises the following steps:
1) first take inner high-frequency crystal as benchmark, initial data code stream is carried out to signal sampling, extract the transmission frequency of initial data code stream, utilize this tranmitting data register to read the data content of initial data code stream, the data of reading enter and send in buffer area according to the principle of first-in first-out, suppose that initial data frequency is f
0, the high-frequency crystal frequency adopting is f
h, be related to f when meeting between the two
h>>f
0time, can obtain the extraction frequency f that precision is higher
0;
2) go out the transmission frequency f of transmitting terminal according to the length of extra data inserting, the frequency computation part of data inserting
1; For guaranteeing the correlation of transmitting terminal frequency and initial data code stream frequency, transmitting terminal frequency f
1should be with the original tranmitting data register f of data code flow
0for basis produces, select extracting frequency f
0the mode of fractional frequency division again of carrying out after N frequency multiplication generates transmission frequency;
3) processing method that adopts pointer to approach, completes in data code flow buffer area the insertion process of excessive data;
4) at receiving terminal, track data is detected, the data code flow that has inserted management control byte is carried out to data extraction, reduce initial data code stream and data frequency simultaneously.
Concrete, the device for intelligently switching described in it is monitored twin-channel running status, time delay difference, transmission quality, moves and switchover policy according to monitoring result determination device:
In the time that breaking down, prepass will automatically switch to an other road;
Delay inequality is harmless switching in allowed band, damages switching when delay inequality is excessive;
Damage while switching, it is poor excessive with prompting channel time delay that device will be stopped paying out one second guard signal.
Its guard signal that is positioned at the described first protection equipment of A end is delivered to first passage switching device shifter by protection interface, the transparent line interface that is sent to again, be sent to B end by fiber optic network and SDH digital multiplexing passage respectively, deliver to again the described second protection equipment of B end through second channel switching device shifter; Once interrupt main channel, first, second passage at A, B two ends switches immediately, maintains the transmission of longitudinal difference protection signal by 2M passage.
Further, the device for intelligently switching described in it comprises protected data transceiver module, communication line transceiver module and main system control module; The data code flow of protected data is delivered to offside with order from left to right by a side protection equipment, respectively by protected data receiver module, and communication line transceiver module, main control module, finally beams back protection equipment by protected data sending module.
Further, the protected data transceiver module described in it adopts transceiving integrated optical device, and its receiver module receives the fiber-optic signal of relay protection device, by the means such as demodulation, decoding, signal frequency unification is arrived to 2.048Mb/s; Its sending module complete protected data recompile, modulate and send back to protection equipment; Described protected data connects transceiver module and has realized the function of traditional photoelectric conversion device and completed the insertion of witness marker word.
Further, described communication line transceiver module sends to offside by the code stream containing banner word by the path of two different routes, what signal of telecommunication transceiver module adopted is the HDB3 code transmission of standard, after optical signal transceiver module adopts 1B4B coding, high frequency 8.192M signal transmits, and module completes conversion, modulation /demodulation and the opto-electronic conversion of line signal simultaneously.
Further, described main control module logic is fpga chip and peripheral circuit thereof, in order to realize the determining and the extraction of banner word of monitoring, switchover policy of alignment, channel status of double-channel signal.
Further, described device for intelligently switching is integrated opto-electronic conversion and passage handoff functionality, adopts optical interface to be connected with protection equipment, provides the electric two kinds of modes of special optic fibre and E1 to transmit in line side, when described device normally moves, the extra time delay of increase is 400us; When the delay inequality of two passages is less than 12ms, switch for harmless, in the time that described fiber plant and/or SDH device channels switch, protective device is normally worked, and does not have the situations such as channel abnormal, error code, step-out to occur; In the time that described fiber plant and/or SDH device channels delay inequality are greater than 12ms, switch to damage at every turn and switched, when switching, can bring the short time alarm of protective device passage and protection to exit, to guarantee the consistency of transceiver channel.
Compared with the prior art, advantage of the present invention is:
1. solved a difficult problem for same switching device shifter and different manufacturers protection devices interconnect, and can the various communication modes of flexible adaptation, compatibility when having realized harmless switching and transparent transmission, and time delay has been carried out to optimized design;
2. in the time that channel status is abnormal, taked special abnormality processing means, and possessed the function of ring diagnosis certainly, for passage dual and channel quality monitoring provide means and approach.
Accompanying drawing explanation
Fig. 1 is typical application structure schematic diagram of the present invention;
Fig. 2 is the another kind of typical application structure schematic diagram of the present invention;
Fig. 3 is the schematic diagram of data insertion method of the present invention;
Fig. 4 is the concrete steps block diagram of data insertion method
Fig. 5 is the schematic diagram that pointer approaches mode
Fig. 6 is that data are extracted and initial data reset mode schematic diagram;
Fig. 7 is the module composition schematic diagram of device for intelligently switching.
In figure, A is first passage switching device shifter, and B is second channel switching device shifter.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
In Fig. 1; technical scheme of the present invention provides a kind of self adaptation relay protection multi-communication mode intelligent switching device; comprise the channel unit for connecting two groups of offside protection equipment; described channel unit comprises fiber plant and/or SDH equipment; its the first protection equipment carries out corresponding connection by channel unit with the second protection equipment of offside; it,, between the first described protection equipment and first passage equipment and between the second protection equipment and second channel equipment of offside, arranges respectively first passage switching device shifter and second channel switching device shifter.
First, second described channel unit corresponding connection of central station gateway computer with intelligent substation station level through local ethernet respectively;
When first, second described channel switching device normally moves, keep the real-time monitoring to communication port running status, according to decision device operation and the passage switchover policy of monitor data intelligence, carry out if desired passage switching simultaneously;
Described first passage switching device shifter and second channel switching device shifter make the protection channel of original single route possess " double route " operation characteristic, adopt accurate fractional frequency division to adapt to the data insertion method of arbitrary data code stream, guard signal is sent to offside by the passage of different routes, improve the reliability of channel unit;
First, second described channel switching device completes the function of opto-electronic conversion and channel protocol conversion simultaneously, to replace photoelectric conversion device corresponding to each protection producer at present.
For distant, between the more nervous plant stand of fiber resource, can be as shown in this figure, select two different digital multiplexing passages of path.
Now channel switching device of the present invention is installed between protection equipment and channel unit; guard signal is sent to offside by the passage of different routes; when the normal operation of device; keep the real-time monitoring to communication port running status; according to decision device operation and the passage switchover policy of monitor data intelligence, carry out if desired passage switching simultaneously.Switching device shifter has completed the function of opto-electronic conversion and channel protocol conversion simultaneously, can replace photoelectric conversion device corresponding to each protection producer at present.
In Fig. 2, for close together, fiber resource, can be as shown in this figure than between more rich plant stand, selects a digital multiplexing passage to add an optical fiber designated lane and carry out passage backup.
All the other same Fig. 1.
In Fig. 3; the accurate fractional frequency division of utilization in the technical program adapts to the data insertion method of arbitrary data code stream; in the original protection code stream of 2.048Mb/s, insert the control byte of small part; as the foundation of passage alignment, detection; also guaranteed the transparent transmission of guard signal, solved the compatibling problem of devices from different manufacturers simultaneously.
As shown in the figure, initial data code stream is through after the processing of the method, insert therein the management control byte of regular length and form with the stable time cycle, and send with new transmission frequency, at receiving terminal, track data is detected, will insert byte and propose, reduce initial data code stream and data frequency simultaneously.
By the method, realize the data of signal code stream are inserted, can solve in transmission process for digital signal many-sided problems such as channel status monitoring, management information transmission.
The method is not subject to the restriction of initial data code stream communication protocol, is applicable in theory all digital signals.Can accurately calculate and generate the stream rate after data inserting according to the numerical value such as length, insertion cycle of the clock rate of initial data code stream, insertion byte; At receiving terminal, adopt same computational methods, extract the management information of insertion and reduce original data code flow.Whole process is guaranteeing to have completed on the basis that initial data code stream accurately transmits the exchange of additional management information, and be no matter to comprise to insert the initial data code stream going out after the stream line of byte or receiving terminal recover, all guarantee the stable level and smooth of clock frequency, guaranteed the stability of data transmit-receive.
In Fig. 4, utilize accurate fractional frequency division to adapt to the detailed process of data insertion method of arbitrary data code stream as follows:
1) first take inner high-frequency crystal as benchmark, initial data code stream is carried out to signal sampling, extract the transmission frequency of initial data code stream, utilize this tranmitting data register to read the data content of initial data code stream, the data of reading enter and send in buffer area according to the principle of first-in first-out, suppose that initial data frequency is f
0, the high-frequency crystal frequency adopting is f
h, be related to f when meeting between the two
h>>f
0time, can obtain the extraction frequency f that precision is higher
0.
2) go out the transmission frequency f of transmitting terminal according to the length of extra data inserting, the frequency computation part of data inserting
1.For guaranteeing the correlation of transmitting terminal frequency and initial data code stream frequency, transmitting terminal frequency f
1should be with the original tranmitting data register f of data code flow
0for basis produces, select here extracting frequency f
0the mode of fractional frequency division again of carrying out after N frequency multiplication generates transmission frequency.
3) insertion process of excessive data completes in data code flow buffer area, has adopted a processing method that pointer approaches.
4) carrying out data extraction and initial data recovery at receiving terminal to having inserted the data code flow of management control byte, is the anti-operation that data are inserted.
In Fig. 5, the mode that pointer approaches is as follows:
Sending buffer area total length is the twice (being 2X) of insertion byte length per second, and reading and writing data location adopts the mode of cycle index, and source code flow data are with f
0speed write in buffer area with order from left to right, work as f
0, send finger starts to start in the same way when the position of pointed buffer area half, and with f
1speed the data order in the cache location of its pointed is sent.Because the two pointer speed exists f
1>f
0relation, therefore f
1pointer position will progressively approach f
0pointer position.Work as f
0pointer and f
1when hands coincide, carry out extra byte update one time: now send finger f
1suspend counting, directly sending length is the management control byte of X, and buffer memory writes pointer f
0move on.Therefore, after data have been inserted, f
1pointer and f
0position difference between pointer is elongated again the X when initial, repeats above process, completes extra byte and inserts.Due to f
1, f
0speed poor constant, therefore the cycle of each data inserting is also constant, has guaranteed the excessive data update of cycle stability, through the data code flow of excessive data insert handling with f
1data rate send to opposite end receiving terminal.
In Fig. 6, carrying out data extraction and initial data recovery at receiving terminal to having inserted the data code flow of management control byte, is the anti-operation that data are inserted, and schematic diagram as shown in the figure.
Different from output update, what data were extracted buffer memory is first-in first-out (FIFO) buffer memory of variable-length, and length range is 0-2X, and the stream rate that writes buffer memory is f
1, easily to know, the stream rate that data are extracted under rear perfect condition should be all f mutually with source code flow
0, can be by progressively adjusting and obtain in actual treatment, establishing and extracting rear stream rate in actual treatment is f
2, f
2can adjust by decimal frequency divider the f2 initial value f that satisfies condition
1>f
2and f
2make it be approximately equal to f by adjusting decimal frequency divider
0.
With the code stream of extra byte with f
1speed write from left to right buffer area, buffer area the 0th is the extra byte detection window of inserting to X unit, its running is as follows:
Code stream is with f
1speed writes buffer area, in the time that buffer area length equals X/2, starts with f
2frequency export data cached in the mode of first-in first-out.Due to f
1>f
2, buffer storage length can be constantly elongated.
When detection window detects after extra data inserting, the data that buffer area is directly X by this part length propose, and buffer storage length shortens to current length and deducts X simultaneously.
Due to the approximate relation having met, therefore the variation of buffer storage length has been limited between 0-2X.
When recording each windows detecting and going out data inserting, buffer area length L, can analyze f by its numerical value change
0, f
2between relation, by adjusting fractional frequency division parameter, make L keep stable, can obtain more accurate extraction frequency f
2.
In Fig. 7, the normal work of this device connects as shown in Figure 1 or 2:
A end guard signal is delivered to channel switching device by protection interface, the more transparent line interface that is sent to, and is sent to B end respectively by fiber optic network and SDH digital multiplexing passage, then delivers to B end protection equipment; Oppositely (B holds A end) same signal transduction process.Once interrupt main channel, two ends passage switches immediately, maintains the transmission of longitudinal difference protection signal by 2M passage (standby).
Device core concept be in original protection code stream, insert a small amount of byte banner word for location, offside is sent its cancellation reduction protection source code flow back to protection receiving after banner word.
As shown in this figure, data code flow is delivered to offside with order from left to right by a side protection equipment, respectively by protected data receiver module, and communication line transceiver module, main control module, finally beams back protection equipment by protected data sending module.
The operation principle of this device:
The main functional modules of this switching device shifter comprises: protected data transceiver module, communication line transceiver module and main system control module.
Protected data transceiver module adopts transceiving integrated optical device, and receiver module receives the fiber-optic signal of relay protection device, by the means such as demodulation, decoding, signal frequency unification is arrived to 2.048Mb/s; Sending module complete protected data recompile, modulate and send back to protection equipment.Protected data connects transceiver module and has realized the function of traditional photoelectric conversion device.
Another critical function of protected data receiver module has been the insertion of witness marker word.Guard signal is converted to after standard 2.048Mb/s data code flow, need in code stream, insert witness marker word.Ideally SDH transmits 2048000 of 2M code elements each second, according to standard G.703, the 2.048M frequency that digital multiplex equipment Chinese style adopts allows the deviation of 50ppm, be that the 2M code element of transmitting each second can reach at most 2048100 left and right, utilize this characteristic, can in standard 2.048M code stream, carry out the insertion of banner word, in switching device shifter, definite insertion strategy is that every 2400000 code elements are inserted 48, be equivalent to transmit each second the 2M code element of 2048040 left and right, be less than 2048100 maximum, can not affect the normal transmission of SDH.Data inserting occurs with the form of short frame, comprises following content: frame head, postamble, frame counter, local device coding, current channel recognition code, the simple and clear operation information of local device, check digit etc.The code stream that has inserted banner word will send to opposite end by communication network by communication line sending module.
Communication line transceiver module sends to offside by the code stream containing banner word by the path of two different routes, what signal of telecommunication transceiver module adopted is the HDB3 code transmission of standard, after optical signal transceiver module adopts 1B4B coding, high frequency 8.192M signal transmits, and module completes conversion, modulation /demodulation and the opto-electronic conversion of line signal simultaneously.
Main control module is the key that switching device shifter algorithm is realized, harmless many important steps of switching, as the extraction of the definite and banner word of the monitoring of the alignment of double-channel signal, channel status, switchover policy etc. all completes in main control module, main control module logical gate completes in High Performance FPGA CycloneIIIc55, its interior door circuit response time has reached 10ns, internal logic unit has exceeded 50000, all can reach system requirements in function and aspect of performance.
Relaying protection switching device shifter is integrated opto-electronic conversion and passage handoff functionality; adopt optical interface to be connected with protection equipment; provide special optic fibre and two kinds of modes of E1 electricity to transmit in line side; complete at present the compatibility test of switching device shifter and multiple protective relaying device manufacturer product; after access switching device shifter, protect normal operation, coordinate in order.
Through meeting the requirements for the test result of switching device shifter itself; equipment itself is supported dual power supply; network management interface close friend; can to all kinds of events with second class precision carry out accurate recording; support the inquiry to historical events; the event that can observe mainly comprises: single channel loss of power, passage are returned alarm, the alarm of transceiver channel intersection, circuit abnormality alarming, protection exception alarm, work at present passage etc., and can observe by the mode of Dynamic Graph the variation of binary channels delay inequality.
When the normal operation of this device, the extra time delay of increase is 400us.When the delay inequality of two passages is less than 12ms, switch for harmless, when passage switches, protective device is normally worked, and does not have the situations such as channel abnormal, error code, step-out to occur; When channel time delay is poor while being greater than 12ms, switch to damage at every turn and switched, when switching, can bring the short time alarm of protective device passage and protection to exit, passage switches the consistency that can guarantee transceiver channel.
In the time that passage operates in A channel; operation on B passage can not produce any impact to protective device, and when B passage breaks down, device is thought now to should be and damaged switching; after B routing restoration, switching device shifter can re-start synchronous location and definite AB channel time delay is poor.
Also utilize the 2M passage detection platform of certain manufacturer in passage, to add error code in test site; when actual test there is the alarm of passage high bit error in protective device; but do not trigger the switching of switching device shifter; prove that switching device shifter only interrupts differentiating to passage; and using this as the foundation of whether switching, this also meets the design concept of switching device shifter transparent transmission simultaneously.
Due to technical scheme of the present invention integrated opto-electronic conversion and passage handoff functionality, adopt optical interface to be connected with protection equipment, provide special optic fibre and two kinds of modes of E1 electricity to transmit in line side, solve a difficult problem for same switching device shifter and different manufacturers protection devices interconnect, and can the various communication modes of flexible adaptation, compatibility when having realized harmless switching and transparent transmission, and time delay has been carried out to optimized design; It has taked special abnormality processing means in the time that channel status is abnormal, and has possessed the function of ring diagnosis certainly, for passage dual and channel quality monitoring provide means and approach.
The present invention can be widely used in relaying protection and the field of data transmission of intelligent grid.
Claims (10)
1. a self adaptation relay protection multi-communication mode intelligent switching device; comprise the channel unit for connecting two groups of offside protection equipment; described channel unit comprises fiber plant and/or SDH equipment; its the first protection equipment carries out corresponding connection by channel unit with the second protection equipment of offside, it is characterized in that:
Between the first described protection equipment and first passage equipment and between the second protection equipment and second channel equipment of offside, first passage switching device shifter and second channel switching device shifter are set respectively;
First, second described channel unit corresponding connection of central station gateway computer with intelligent substation station level through local ethernet respectively,
When first, second described channel switching device normally moves, keep the real-time monitoring to communication port running status, according to decision device operation and the passage switchover policy of monitor data intelligence, carry out if desired passage switching simultaneously;
Described first passage switching device shifter and second channel switching device shifter make the protection channel of original single route possess " double route " operation characteristic, adopt accurate fractional frequency division to adapt to the data insertion method of arbitrary data code stream, guard signal is sent to offside by the passage of different routes, improve the reliability of channel unit;
First, second described channel switching device completes the function of opto-electronic conversion and channel protocol conversion simultaneously, to replace photoelectric conversion device corresponding to each protection producer at present.
2. according to self adaptation relay protection multi-communication mode intelligent switching device claimed in claim 1, it is characterized in that described accurate fractional frequency division adapts to data insertion method insertion portion control byte in the original protection code stream of 2.048Mb/s of arbitrary data code stream, as the foundation of passage alignment, detection, also can guarantee the transparent transmission of guard signal, solve the compatibling problem of devices from different manufacturers simultaneously;
Described initial data code stream is through after the processing of the method, insert therein the management control byte of regular length and form with the stable time cycle, and send with new transmission frequency, at receiving terminal, track data is detected, to insert byte and propose, reduce initial data code stream and data frequency simultaneously.
3. according to self adaptation relay protection multi-communication mode intelligent switching device claimed in claim 1, it is characterized in that the data insertion method of described accurate fractional frequency division adaptation arbitrary data code stream comprises the following steps:
1) first take inner high-frequency crystal as benchmark, initial data code stream is carried out to signal sampling, extract the transmission frequency of initial data code stream, utilize this tranmitting data register to read the data content of initial data code stream, the data of reading enter and send in buffer area according to the principle of first-in first-out, suppose that initial data frequency is f
0, the high-frequency crystal frequency adopting is f
h, be related to f when meeting between the two
h>>f
0time, can obtain the extraction frequency f that precision is higher
0;
2) go out the transmission frequency f of transmitting terminal according to the length of extra data inserting, the frequency computation part of data inserting
1; For guaranteeing the correlation of transmitting terminal frequency and initial data code stream frequency, transmitting terminal frequency f
1should be with the original tranmitting data register f of data code flow
0for basis produces, select extracting frequency f
0the mode of fractional frequency division again of carrying out after N frequency multiplication generates transmission frequency;
3) processing method that adopts pointer to approach, completes in data code flow buffer area the insertion process of excessive data;
4) at receiving terminal, track data is detected, the data code flow that has inserted management control byte is carried out to data extraction, reduce initial data code stream and data frequency simultaneously.
4. according to self adaptation relay protection multi-communication mode intelligent switching device claimed in claim 1; device for intelligently switching described in it is characterized in that is monitored twin-channel running status, time delay difference, transmission quality, moves and switchover policy according to monitoring result determination device:
In the time that breaking down, prepass will automatically switch to an other road;
Delay inequality is harmless switching in allowed band, damages switching when delay inequality is excessive;
Damage while switching, it is poor excessive with prompting channel time delay that device will be stopped paying out one second guard signal.
5. according to self adaptation relay protection multi-communication mode intelligent switching device claimed in claim 1, the guard signal that it is characterized in that described the first protection equipment that is positioned at A end is delivered to first passage switching device shifter by protection interface, the transparent line interface that is sent to again, be sent to B end by fiber optic network and SDH digital multiplexing passage respectively, deliver to again the described second protection equipment of B end through second channel switching device shifter; Once interrupt main channel, first, second passage at A, B two ends switches immediately, maintains the transmission of longitudinal difference protection signal by 2M passage.
6. according to self adaptation relay protection multi-communication mode intelligent switching device claimed in claim 1, it is characterized in that described device for intelligently switching comprises protected data transceiver module, communication line transceiver module and main system control module; The data code flow of protected data is delivered to offside with order from left to right by a side protection equipment, respectively by protected data receiver module, and communication line transceiver module, main control module, finally beams back protection equipment by protected data sending module.
7. according to self adaptation relay protection multi-communication mode intelligent switching device claimed in claim 6, it is characterized in that described protected data transceiver module adopts transceiving integrated optical device, its receiver module receives the fiber-optic signal of relay protection device, by the means such as demodulation, decoding, signal frequency unification is arrived to 2.048Mb/s; Its sending module complete protected data recompile, modulate and send back to protection equipment; Described protected data connects transceiver module and has realized the function of traditional photoelectric conversion device and completed the insertion of witness marker word.
8. according to self adaptation relay protection multi-communication mode intelligent switching device claimed in claim 6; it is characterized in that described communication line transceiver module sends to offside by the code stream containing banner word by the path of two different routes; what signal of telecommunication transceiver module adopted is the HDB3 code transmission of standard; after optical signal transceiver module adopts 1B4B coding, high frequency 8.192M signal transmits, and module completes conversion, modulation /demodulation and the opto-electronic conversion of line signal simultaneously.
9. according to self adaptation relay protection multi-communication mode intelligent switching device claimed in claim 6; it is characterized in that described main control module logic is fpga chip and peripheral circuit thereof, in order to realize the determining and the extraction of banner word of monitoring, switchover policy of alignment, channel status of double-channel signal.
10. according to self adaptation relay protection multi-communication mode intelligent switching device claimed in claim 1, it is characterized in that described device for intelligently switching integrated opto-electronic conversion and passage handoff functionality, adopt optical interface to be connected with protection equipment, provide special optic fibre and two kinds of modes of E1 electricity to transmit in line side, when described device normally moves, the extra time delay of increase is 400us; When the delay inequality of two passages is less than 12ms, switch for harmless, in the time that described fiber plant and/or SDH device channels switch, protective device is normally worked, and does not have the situations such as channel abnormal, error code, step-out to occur; In the time that described fiber plant and/or SDH device channels delay inequality are greater than 12ms, switch to damage at every turn and switched, when switching, can bring the short time alarm of protective device passage and protection to exit, to guarantee the consistency of transceiver channel.
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