CN115361087A - Photoelectric multiplexing communication device and method applied to power grid relay protection channel - Google Patents
Photoelectric multiplexing communication device and method applied to power grid relay protection channel Download PDFInfo
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- CN115361087A CN115361087A CN202211276533.3A CN202211276533A CN115361087A CN 115361087 A CN115361087 A CN 115361087A CN 202211276533 A CN202211276533 A CN 202211276533A CN 115361087 A CN115361087 A CN 115361087A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1652—Optical Transport Network [OTN]
- H04J3/1664—Optical Transport Network [OTN] carrying hybrid payloads, e.g. different types of packets or carrying frames and packets in the paylaod
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0256—Optical medium access at the optical channel layer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/06—Notations for structuring of protocol data, e.g. abstract syntax notation one [ASN.1]
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Abstract
A photoelectric multiplexing communication device and method applied to a power grid relay protection channel are disclosed, and the device comprises: the C37.94 interface unit is used for receiving C37.94 signals transmitted by each path of relay protection equipment through the 2M optical port; the code rate adjusting and protocol controlling unit is used for carrying out protocol encapsulation and code rate adjustment on the C37.94 signal to obtain an adjusted C37.94 signal; a multiplexing and demultiplexing unit, configured to multiplex the adjusted C37.94 signal, and obtain a multiplexed C37.94 signal; a code rate adjusting and protocol controlling unit, which is used for carrying out protocol processing on the multiplexed C37.94 signal to obtain a processed C37.94 signal; and the transmission interface unit is used for carrying out routing according to the processed C37.94 signal and transmitting the processed C37.94 signal to the power grid. The invention improves the real-time property, the anti-interference capability and the stability of relay protection communication.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a photoelectric multiplexing communication device and method applied to a power grid relay protection channel.
Background
Relay protection communication is an important power grid communication mode, is used for ensuring that a protection device does not malfunction when no fault occurs, and reliably acts when a fault occurs, selectively and quickly removes the fault, and is widely applied to various power systems, such as a power system consisting of electric vehicle charging stations.
At present, relay protection devices produced by different device manufacturers usually adopt different interface standards and are incompatible with each other, for example, access interfaces of the relay protection devices include electrical interfaces such as E1 and ethernet, transmission channels include an IP (Internet Protocol ) packet transmission network and an SDH (Synchronous Digital Hierarchy) optical transmission network, which increases the management and maintenance difficulty of relay protection devices in relay protection communication.
Disclosure of Invention
The invention solves the technical problem of how to improve the real-time performance, the anti-interference capability and the stability of relay protection communication.
In order to solve the above problems, the present invention provides a photoelectric multiplexing communication apparatus and method applied to a power grid relay protection channel.
In a first aspect, the present invention provides a photoelectric multiplexing communication device applied to a relay protection channel of a power grid, including: the system comprises a C37.94 interface unit, a code rate adjusting and protocol controlling unit, a multiplexing and demultiplexing unit and a transmission interface unit which are connected through a system bus, wherein the C37.94 interface unit is used for being connected with a 2M optical port of at least one path of relay protection equipment, and the transmission interface unit is used for being connected to a power grid through an optical transmission network and/or an IP packet transmission network;
the C37.94 interface unit is used for receiving C37.94 signals transmitted by each path of relay protection equipment through the 2M optical port;
the code rate adjusting and protocol controlling unit is used for carrying out protocol encapsulation and code rate adjustment on the C37.94 signal to obtain an adjusted C37.94 signal;
a multiplexing and demultiplexing unit, configured to multiplex the adjusted C37.94 signal in a time division multiplexing manner or a wavelength division multiplexing manner, so as to obtain a multiplexed C37.94 signal;
the code rate adjusting and protocol controlling unit is further configured to perform protocol processing on the multiplexed C37.94 signal to obtain a processed C37.94 signal, where the processed C37.94 signal includes C37.94 signals in different protocol formats;
and the transmission interface unit is used for carrying out routing selection according to the processed C37.94 signals and transmitting the processed C37.94 signals to the power grid by adopting an optical transmission network and/or an IP packet transmission network according to a routing selection result.
Optionally, the multiplexing and demultiplexing unit is specifically configured to:
multiplexing the low-order time slots of the multi-path C37.94 time slots in the adjusted C37.94 signals to generate high-order time slots;
and performing group sending and interface packaging on the high-order time slot to obtain C37.94 signals in different protocol formats suitable for transmission in different transmission channels.
Optionally, the multiplexing and demultiplexing unit is specifically configured to: and performing group transmission on the high-order time slot by adopting a group transmission and selective reception mode or a selective transmission and selective reception mode.
Optionally, the C37.94 signals of different protocol formats suitable for transmission in different transmission channels are backups of each other.
Optionally, the data frame of the C37.94 signal includes a frame header, an overhead and a payload, the frame header occupies 16 bits, the overhead occupies 48 bits, the actual information bits are 24, the payload occupies 192 bits, and the actual information bits are 96.
Optionally, a storage unit for storing the intermediate data is further included.
Alternatively, the optical transport network comprises an SDH transport network and an OTN transport network based on WDM technology, and the IP packet transport network comprises a PWE3 transport network.
In a second aspect, the present invention provides a photoelectric multiplexing communication method applied to a power grid relay protection channel, where based on the photoelectric multiplexing communication device applied to the power grid relay protection channel according to any one of the first aspects, the method includes:
the C37.94 interface unit receives C37.94 signals transmitted by each path of relay protection equipment through the 2M optical port;
the code rate adjusting and protocol controlling unit performs protocol encapsulation and code rate adjustment on the C37.94 signal to obtain an adjusted C37.94 signal;
the multiplexing and de-multiplexing unit multiplexes the adjusted C37.94 signal by adopting a time division multiplexing mode or a wavelength division multiplexing mode to obtain a multiplexed C37.94 signal;
the code rate adjusting and protocol controlling unit performs protocol processing on the multiplexed C37.94 signal to obtain a processed C37.94 signal, wherein the processed C37.94 signal comprises C37.94 signals in different protocol formats;
and the transmission interface unit performs routing according to the processed C37.94 signal, and transmits the processed C37.94 signal to the power grid by using an optical transmission network and/or an IP packet transmission network according to a routing result.
Optionally, the multiplexing and demultiplexing unit multiplexing the adjusted C37.94 signal in a time division multiplexing manner or a wavelength division multiplexing manner includes:
multiplexing the low-order time slots of the multipath C37.94 time slots in the adjusted C37.94 signals to generate high-order time slots;
and carrying out group sending and interface packaging on the high-order time slot to obtain C37.94 signals of different protocol formats suitable for transmission in different transmission channels.
Optionally, the performing group sending and interface encapsulation on the high-order timeslot includes: and performing group transmission on the high-order time slot by adopting a group transmission and selective reception mode or a selective transmission and selective reception mode.
The photoelectric multiplexing communication device and method applied to the power grid relay protection channel have the beneficial effects that: the C37.94 interface unit, the code rate adjusting and protocol controlling unit, the multiplexing and de-multiplexing unit and the transmission interface unit are connected through a system bus, and connecting lines can be simplified. The C37.94 interface unit is used for being connected with the 2M optical port of at least one path of relay protection equipment, receiving C37.94 signals transmitted by each path of relay protection equipment through the 2M optical port, and being connected with the 2M optical port of each path of relay protection equipment through the C37.94 interface unit, so that the interface standard of the relay protection equipment is unified, and the maintenance and management of the relay protection equipment and the like are facilitated. Moreover, the C37.94 interface unit transmits the C37.94 signal by using the optical fiber channel, which can shorten the signal transmission delay, avoid the interference possibly suffered in the switching process, and improve the real-time performance and reliability of the C37.94 signal transmission. The code rate adjusting and protocol controlling unit is used for performing protocol encapsulation and code rate adjustment on the C37.94 signal, and can process the C37.94 signal into a standard protocol format and a standard bandwidth granularity, so that the multiplexing and demultiplexing units can process the signal conveniently. The multiplexing and demultiplexing unit multiplexes the adjusted C37.94 signal by using a time division multiplexing method or a wavelength division multiplexing method, and can multiplex a low-order time slot into a high-order time slot to obtain the multiplexed C37.94 signal. The code rate adjustment and protocol control unit performs protocol processing on the multiplexed C37.94 signal, and can encapsulate the high-order time slot into a plurality of C37.94 signals with different protocol formats. The transmission interface unit performs routing selection according to the processed C37.94 signals, and uses the optical transmission network and/or the IP packet transmission network to perform networking on the processed C37.94 signals according to the routing selection result, so that transmission backup can be realized in the optical transmission network channel and the IP packet transmission network channel, that is, the C37.94 signals in different protocol formats are mutually backed up, an effective protection switching mechanism is formed, and the real-time performance and the stability of relay protection communication are improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a photoelectric multiplexing communication device applied to a power grid relay protection channel according to an embodiment of the present invention;
fig. 2 is a frame structure diagram of a C37.94 signal data frame according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of the multiplexing and demultiplexing unit according to the embodiment of the present invention multiplexing the adjusted C37.94 signal;
fig. 4 is a schematic flow chart of a photoelectric multiplexing communication method applied to a power grid relay protection channel in an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more complete and thorough understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
It should be understood that the various steps recited in method embodiments of the present invention may be performed in a different order, and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the invention is not limited in this respect.
The term "including" and variations thereof as used herein is intended to be open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "alternative embodiment". Relevant definitions for other terms will be given in the following description. It should be noted that the terms "first", "second", and the like in the present invention are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.
It is noted that references to "a" or "an" or "the" modification(s) in the present invention are intended to be illustrative rather than limiting and that those skilled in the art will understand that reference to "one or more" unless the context clearly indicates otherwise.
The names of messages or information exchanged between devices in the embodiments of the present invention are for illustrative purposes only, and are not intended to limit the scope of the messages or information.
As shown in fig. 1, an embodiment of the present invention provides an optical-electrical multiplexing communication device applied to a relay protection channel of a power grid, including: the system comprises a C37.94 (standard established by the institute of Electrical and electronics Engineers) interface unit, a code speed adjusting and Protocol control unit, a multiplexing and demultiplexing unit and a transmission interface unit which are connected through a system bus, wherein the C37.94 interface unit is used for being connected with at least one path of 2M optical ports of relay protection equipment, and the transmission interface unit is used for being connected to a power grid through an optical transmission network and/or an IP (Internet Protocol, internet interconnection Protocol) packet transmission network;
the C37.94 interface unit is used for receiving C37.94 signals transmitted by each path of relay protection equipment through the 2M optical port;
the code rate adjusting and protocol controlling unit is used for carrying out protocol encapsulation and code rate adjustment on the C37.94 signal to obtain an adjusted C37.94 signal;
a multiplexing and demultiplexing unit, configured to multiplex the adjusted C37.94 signal in a time division multiplexing manner or a wavelength division multiplexing manner, so as to obtain a multiplexed C37.94 signal;
the code rate adjusting and protocol controlling unit is further configured to perform protocol processing on the multiplexed C37.94 signal to obtain a processed C37.94 signal, where the processed C37.94 signal includes C37.94 signals in different protocol formats;
and the transmission interface unit is used for carrying out routing selection according to the processed C37.94 signals and transmitting the processed C37.94 signals to the power grid by adopting an optical transmission network and/or an IP packet transmission network according to a routing selection result.
Specifically, data transfer of the C37.94 interface unit:
the transmission system for grid communication is usually a time division multiplexing system of SDH (Synchronous Digital Hierarchy) and a packet transmission system based on IP, and accordingly, two technologies are adopted for the uplink interface of the end multiplexing device: TDM (time-division multiplexing), IP packet transfer technology.
The TDM time division multiplexing technology is widely applied in an industrial private network, most typical digital synchronous series devices such as MSTP (Multi-Service Transport Platform) and MSAP (Multi-Service Access Platform) have the advantages of time slot transparent transmission, small transmission delay and mature, stable and reliable technology.
With the wide application of IP packet transmission technology in various fields, a plurality of conventional interfaces based on time division multiplexing technology need to implement compatibility in an IP transmission network, and a new technology is generated for transparent transmission of time division multiplexing time slots in the IP transmission network: pseudowire Emulation technology PWE3 (Pseudo Wire Edge to Edge Emulation) and forms an industry standard.
The C37.94 interface born based on the time division multiplexing technology system is used for transmitting a communication port of a vital relay protection device in power grid communication, and both access and transmission need to adopt 1: n backup to ensure that communication service is not interrupted. The transmission channel of c37.94d is generally based on an SDH optical transmission network, and a substation with more than 110 kv mostly realizes mutual backup of an a network and a B network of the SDH optical transmission network.
One or more paths of 2M optical ports (C37.94 protocols) of the relay protection equipment are accessed to a C37.94 interface unit of the device, then are connected with a protocol control unit and a multiplexing and demultiplexing unit (containing a clock processing unit) through a system bus and code rate adjustment, C37.94 signals are subjected to digital signal format conversion of the C37.94 interface unit, then enter the multiplexing and demultiplexing unit through protocol encapsulation and code rate adjustment processing of the code rate adjustment and protocol control unit, enter the multiplexing and demultiplexing unit through standard protocols and bandwidth particles, are subjected to protocol processing of the protocol control unit after multiplexing, are subjected to routing selection of a transmission interface unit, and finally are subjected to networking with the whole transmission network through an optical transmission network or an IP packet transmission network.
The C37.94 signal is converted into digital signal format in the C37.94 signal interface unit, and then is encapsulated by the code rate adjustment and protocol control unit, and the encapsulated signal can be VC12 standard bandwidth granule, so that it is effectively identified by the multiplexing and demultiplexing unit via the system bus.
In this embodiment, the C37.94 interface unit, the code rate adjustment and protocol control unit, the multiplexing and demultiplexing unit, and the transmission interface unit are connected via a system bus, which can simplify a connection line. The C37.94 interface unit is used for being connected with the 2M optical port of at least one path of relay protection equipment, receiving C37.94 signals transmitted by each path of relay protection equipment through the 2M optical port, and being connected with the 2M optical port of each path of relay protection equipment through the C37.94 interface unit, so that the interface standard of the relay protection equipment is unified, and the maintenance and management of the relay protection equipment and the like are facilitated. Moreover, the C37.94 interface unit transmits the C37.94 signal by using the optical fiber channel, which can shorten the signal transmission delay, avoid the interference possibly suffered in the switching process, and improve the real-time performance and reliability of the C37.94 signal transmission. The code rate adjusting and protocol controlling unit is used for performing protocol encapsulation and code rate adjustment on the C37.94 signal, and can process the C37.94 signal into a standard protocol format and a standard bandwidth granularity, so that the multiplexing and demultiplexing units can process the signal conveniently. The multiplexing and demultiplexing unit multiplexes the adjusted C37.94 signal by using a time division multiplexing method or a wavelength division multiplexing method, and can multiplex a low-order time slot into a high-order time slot to obtain the multiplexed C37.94 signal. The code rate adjusting and protocol controlling unit performs protocol processing on the multiplexed C37.94 signal, and can encapsulate the high-order time slot into a plurality of C37.94 signals with different protocol formats. The transmission interface unit performs routing selection according to the processed C37.94 signals, and uses the optical transmission network and/or the IP packet transmission network to perform networking on the processed C37.94 signals according to the routing selection result, so that transmission backup can be realized in the optical transmission network channel and the IP packet transmission network channel, that is, the C37.94 signals in different protocol formats are mutually backed up, an effective protection switching mechanism is formed, and the real-time performance and the stability of relay protection communication are improved.
The embodiment realizes the access standardization of the power grid relay protection control communication in the substation communication and the access and transmission backup functions, improves the access reliability of the relay protection control service, can be widely popularized in the power grid, and has expected social benefit and economic benefit.
The reliability of the relay protection control service is effectively enhanced, the operation safety of the power grid service is improved, the relay protection control service can be widely popularized in a power grid, the power utilization guarantee is provided for production and life of people, the technical achievement experience of the project achievement can also be widely popularized in other industry network markets, and social benefits and economic benefits are expected.
A special multiplexing device for C37.94 is realized by applying time division multiplexing technology and pseudo wire simulation technology, can realize transmission backup in SDH optical transmission network and IP packet transmission network channels, and can realize backup among boards of main control, power supply, access interface and transmission interface.
Optionally, the multiplexing and demultiplexing unit is specifically configured to:
multiplexing the low-order time slots of the multipath C37.94 time slots in the adjusted C37.94 signals to generate high-order time slots;
and performing group sending and interface packaging on the high-order time slot to obtain C37.94 signals in different protocol formats suitable for transmission in different transmission channels.
Optionally, the multiplexing and demultiplexing unit is specifically configured to: and performing group transmission on the high-order time slot by adopting a group transmission selective receiving mode or a selective transmission selective receiving mode.
Optionally, the C37.94 signals of different protocol formats suitable for transmission in different transmission channels are backups of each other.
Specifically, the invention aims to realize transmission and backup of a plurality of 2M optical ports (C37.94 protocol) through a plurality of transmission channels of different protocols, and the process of signals from access to transmission is shown in figure 3.
In fig. 3, a C37.94 service obtains a VC3 or VC4 timeslot with a large particle through a Multiplexing technology, and obtains a transmission interface suitable for transmission in different transmission channels through encapsulation processing on the transmission interface, such as SDH transmission, OTN (optical transport network) transmission based on WDM (Wavelength Division Multiplexing) technology, IP packet transmission, and the like, where a signal adopts a group transmission and selective reception mode or a selective transmission and selective reception mode. The key point is that after the high-order time slot is encapsulated through an interface, transmission signals of different protocols are obtained, the transmission signals of different protocols can realize mutual backup, and backup switching of the transmission signals among SDH, OTN and PWE3 transmission networks can be realized. The transmission signal backup mode is a group transmission selective receiving mode or a selective transmission selective receiving mode.
If the bandwidth resource of the transmission channel is rich, a group sending and selective receiving mode can be adopted, the backup switching time of the mode is short, the time slot inversion can not generate error codes, but the bandwidth resource is occupied more. The selective transmitting and receiving mode can also be adopted, but the backup switching time of the transmission channel is longer, and the time slot switching may generate instantaneous error codes. However, the backup switching time of the two modes is less than 50ms, and the requirements of the industry standard on transmission switching are met.
Optionally, the data frame of the C37.94 signal includes a frame header, an overhead and a payload, the frame header occupies 16 bits, the overhead occupies 48 bits, the actual information bits are 24, the payload occupies 192 bits, and the actual information bits are 96.
Specifically, the frame structure of the C37.94 signal data frame is shown in fig. 2.
The frame structure and multiplexing rule of the C37.94 interface (2M optical interface) are as follows: the C37.94 interface completes interconnection of equipment with the C37.94 interface, such as power protection equipment of a user, and NE equipment, completes access and transparent transmission of data services, and realizes private line interconnection. In the relay protection information transmission, the most applied channels are 64kbit/s and 2Mbit/s, and the transmission bandwidth of the 64kbit/s channel is very low, so that great limitation is brought to the transmission of the relay protection information. Meanwhile, when a 64kbit/s channel is used, the digital multiplexing equipment generally adopts a 64K homodromous interface, and the interface needs to be accessed into a power communication network through the multiplexing equipment, so that the signal transmission delay and the interference possibly suffered in the switching process are increased, and the rapidity and the reliability of signal transmission are protected. And C37.94 is used as a 2Mbit/s optical interface (2M optical port), when the relay protection information is transmitted by using the optical fiber channel, the signal transmission time delay can be shortened, the possible interference in the switching process can be avoided, and the rapidity and the reliability of signal transmission are improved. In addition, investment can be saved, and communication management links can be simplified. The interface takes 64Kbit/s as basic time slot, and the frame structure conforms to G.704 standard of ITU-T (International telecommunication Union, telecommunication standards, bureau), wherein the data structure does not conform to the data format of G.704. As shown in fig. 2, a data frame in the C37.94 standard consists of a frame header, overhead, and payload.
a. The frame header occupies 16 bits and has a format of abcdefg00001111. There are two combinations of the first eight bits abcdefg, each of which occurs alternately during frame transmission.
Combination 1: the abcdefg octets are 10011011, respectively.
And (3) combination 2: the abcdefg octets are 11y11111, respectively. Wherein when y is 0, it means normal; when y is 1, it indicates that there is an RDI (remote defect indication) alarm.
b. Overhead, takes 48 bits, the actual information bits 24, each followed by a corresponding anticode. p, q, r, s are used to indicate the number of 64kbit/s channels actually used, from 1 to 12, expressed in pqrs:
pqrs =0001, indicating that the number of channels is 1.
pqrs =0010, indicating that the number of channels is 2.
...
pqrs =1100, indicating a number of channels of 12.
c. Payload, which takes 192 bits, the actual information bits are 96, each followed by a corresponding anticode. Of the 96 information bits, every successive 8 information bits are used to transmit 1 64kbit/s of data from the beginning. Thus, a total of 96 (12 by 8) information bits are available to transmit 12 64kbit/s of data.
Optionally, a storage unit for storing the intermediate data is further included.
Alternatively, the optical transport network comprises an SDH transport network and an OTN transport network based on WDM technology, and the IP packet transport network comprises a PWE3 transport network.
Specifically, the present embodiment meets the requirements related to SDH, PWE3, OTN, PCM (Pulse Code Modulation) in the communication industry standard; the relevant standard of the power grid industry on C37.94 is met; at least meeting the backup switching of two different protocol transmission channels; the number of 2M optical ports (C37.94) is not less than 4; the SDH interface model can be STM-1/4/16, and the number of ports is not less than 2; the Ethernet port of the PWE3 protocol is not less than 2 kilomega; an E1 interface can be configured optionally; the number and the types of the interfaces can be increased according to needs, and the structural form can be changed.
As shown in fig. 4, an embodiment of the present invention provides a photoelectric multiplexing communication method applied to a power grid relay protection channel, where based on the above-mentioned photoelectric multiplexing communication device applied to the power grid relay protection channel, the method includes:
step S100, a C37.94 interface unit receives C37.94 signals transmitted by each path of relay protection equipment through a 2M optical port;
step S200, the code rate adjusting and protocol controlling unit carries out protocol encapsulation and code rate adjustment on the C37.94 signal to obtain an adjusted C37.94 signal;
step S300, the multiplexing and demultiplexing unit multiplexes the adjusted C37.94 signal by adopting a time division multiplexing mode or a wavelength division multiplexing mode to obtain a multiplexed C37.94 signal;
step S400, the code rate adjusting and protocol controlling unit performs protocol processing on the multiplexed C37.94 signal to obtain a processed C37.94 signal, wherein the processed C37.94 signal comprises C37.94 signals with different protocol formats;
and S500, the transmission interface unit carries out routing selection according to the processed C37.94 signal, and transmits the processed C37.94 signal to the power grid by adopting an optical transmission network and/or an IP packet transmission network according to a routing selection result.
Compared with the prior art, the advantages of the photoelectric multiplexing communication method applied to the power grid relay protection channel in this embodiment are the same as the advantages of the photoelectric multiplexing communication device applied to the power grid relay protection channel in the prior art, and are not described herein again.
Optionally, the multiplexing and demultiplexing unit multiplexing the adjusted C37.94 signal in a time division multiplexing manner or a wavelength division multiplexing manner includes:
multiplexing the low-order time slots of the multi-path C37.94 time slots in the adjusted C37.94 signals to generate high-order time slots;
and performing group sending and interface packaging on the high-order time slot to obtain C37.94 signals in different protocol formats suitable for transmission in different transmission channels.
Optionally, the performing group sending and interface encapsulation on the high-order timeslot includes: and performing group transmission on the high-order time slot by adopting a group transmission selective receiving mode or a selective transmission selective receiving mode.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like. In this application, the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present invention. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
Although the present disclosure has been described with reference to the above embodiments, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.
Claims (10)
1. The utility model provides a be applied to electric wire netting relay protection passageway's optoelectrical multiplexing communication device which characterized in that, it includes: the system comprises a C37.94 interface unit, a code rate adjusting and protocol controlling unit, a multiplexing and demultiplexing unit and a transmission interface unit which are connected through a system bus, wherein the C37.94 interface unit is used for being connected with a 2M optical port of at least one path of relay protection equipment, and the transmission interface unit is used for being connected to a power grid through an optical transmission network and/or an IP packet transmission network;
the C37.94 interface unit is configured to receive C37.94 signals transmitted by each path of the relay protection device through a 2M optical port;
the code rate adjusting and protocol controlling unit is used for performing protocol encapsulation and code rate adjustment on the C37.94 signal to obtain an adjusted C37.94 signal;
the multiplexing and demultiplexing unit is configured to multiplex the adjusted C37.94 signal in a time division multiplexing manner or a wavelength division multiplexing manner to obtain a multiplexed C37.94 signal;
the code rate adjusting and protocol controlling unit is further configured to perform protocol processing on the multiplexed C37.94 signal to obtain a processed C37.94 signal, where the processed C37.94 signal includes C37.94 signals with different protocol formats;
and the transmission interface unit is used for carrying out routing selection according to the processed C37.94 signal and transmitting the processed C37.94 signal to a power grid by adopting an optical transmission network and/or an IP packet transmission network according to a routing selection result.
2. The photoelectric multiplexing communication device applied to the power grid relay protection channel according to claim 1, wherein the multiplexing and demultiplexing unit is specifically configured to:
multiplexing the multiplex C37.94 time slots in the adjusted C37.94 signal by a low order time slot to generate a high order time slot;
and performing group sending and interface packaging on the high-order time slot to obtain C37.94 signals in different protocol formats suitable for transmission in different transmission channels.
3. The photoelectric multiplexing communication device applied to the power grid relay protection channel according to claim 2, wherein the multiplexing and demultiplexing unit is specifically configured to: and performing group transmission on the high-order time slot by adopting a group transmission and selective reception mode or a selective transmission and selective reception mode.
4. The optical-electrical multiplexing communication device applied to the power grid relay protection channel according to claim 2, wherein the C37.94 signals in different protocol formats, which are suitable for transmission in different transmission channels, are mutually backed up.
5. The photoelectric multiplexing communication device applied to the power grid relay protection channel is characterized in that a data frame of a C37.94 signal comprises a frame header, an overhead and a payload, wherein the frame header occupies 16 bits, the overhead occupies 48 bits, the actual information bits are 24 bits, the payload occupies 192 bits, and the actual information bits are 96 bits.
6. The photoelectric multiplexing communication device applied to the power grid relay protection channel according to any one of claims 1 to 4, further comprising a storage unit for storing intermediate data.
7. The optical-electrical multiplexing communication device applied to the power grid relay protection channel according to any one of claims 1 to 4, wherein the optical transmission network comprises an SDH transmission network and an OTN transmission network based on WDM technology, and the IP packet transmission network comprises a PWE3 transmission network.
8. The photoelectric multiplexing communication method applied to the power grid relay protection channel is characterized in that based on the photoelectric multiplexing communication device applied to the power grid relay protection channel in any one of claims 1 to 7, the method comprises the following steps:
the C37.94 interface unit receives C37.94 signals transmitted by each path of relay protection equipment through the 2M optical port;
the code rate adjusting and protocol controlling unit performs protocol encapsulation and code rate adjustment on the C37.94 signal to obtain an adjusted C37.94 signal;
the multiplexing and demultiplexing unit multiplexes the adjusted C37.94 signal by adopting a time division multiplexing mode or a wavelength division multiplexing mode to obtain a multiplexed C37.94 signal;
the code rate adjusting and protocol controlling unit performs protocol processing on the multiplexed C37.94 signal to obtain a processed C37.94 signal, wherein the processed C37.94 signal comprises C37.94 signals in different protocol formats;
and the transmission interface unit performs routing according to the processed C37.94 signal, and transmits the processed C37.94 signal to the power grid by using an optical transmission network and/or an IP packet transmission network according to a routing result.
9. The optical-electrical multiplexing communication method applied to the power grid relay protection channel according to claim 8, wherein the multiplexing and demultiplexing unit multiplexes the adjusted C37.94 signal by using a time division multiplexing method or a wavelength division multiplexing method, and includes:
multiplexing the low-order time slots of the multi-path C37.94 time slots in the adjusted C37.94 signals to generate high-order time slots;
and carrying out group sending and interface packaging on the high-order time slot to obtain C37.94 signals of different protocol formats suitable for transmission in different transmission channels.
10. The optical-electrical multiplexing communication method applied to the power grid relay protection channel according to claim 9, wherein the performing group transmission and interface encapsulation on the high-order timeslot includes: and performing group transmission on the high-order time slot by adopting a group transmission and selective reception mode or a selective transmission and selective reception mode.
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