CN114844016A - Flexe-based differential protection system, differential protection method and differential protection device - Google Patents
Flexe-based differential protection system, differential protection method and differential protection device Download PDFInfo
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- CN114844016A CN114844016A CN202210780590.9A CN202210780590A CN114844016A CN 114844016 A CN114844016 A CN 114844016A CN 202210780590 A CN202210780590 A CN 202210780590A CN 114844016 A CN114844016 A CN 114844016A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
- H02H1/0084—Details of emergency protective circuit arrangements concerning transmission of signals by means of pilot wires or a telephone network; watching of these wires
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The invention provides a Flexe-based differential protection system, a differential protection method and a device, wherein a virtual local area network is established based on Flexe, mutually isolated network slices are established for each communication tunnel to allow a differential protection device to communicate, the communication time delay and the communication error rate between the differential protection devices at two ends of a protection area are controlled within a required range, and the smooth implementation of differential protection is ensured.
Description
Technical Field
The invention relates to the technical field of current protection, in particular to a FlexE-based differential protection system, a differential protection method and a differential protection device.
Background
Power systems often fail or operate improperly for a variety of reasons. The most common fault is a short circuit in the power supply system. A short circuit of a line can generate a large short-circuit current, and at the same time, the supply voltage of the power system can drop, thereby causing serious consequences, such as shortening the service life of components, damaging faulty components, causing fluctuation of the power quality of users, and causing oscillation and even breakdown of the whole power system.
Differential protection is a protection device in relay protection, which can detect a fault or an abnormal operation state of a power system element and can enable a circuit breaker to trip or send a signal. Differential protection devices require automatic, rapid, and selective removal of a faulty unit from the power system. By detecting the vector difference of the current at the two ends of the input current transformer, the action element is started when a set action value is reached, and the protection range of the action element is equipment between the two ends of the input current transformer and can be electric equipment such as a circuit, a generator, a motor, a transformer and the like.
When the differential protection device works normally, the real-time transmission and the acquisition of the electrical quantity information at two ends are required, so that certain requirements are required on the aspects of speed, time delay, reliability, safety and the like of a communication channel. The protection device has different numbers of bytes of data to be transmitted and different bandwidth requirements on the channel according to different adopted judgment situations.
However, in the conventional power communication network, data signal transmission is performed by a general-purpose network, and it is difficult to meet the communication requirement of differential protection.
Disclosure of Invention
The invention provides a flexE-based differential protection system, a differential protection method and a differential protection device, which are used for eliminating or improving one or more defects in the prior art and solving the problem that effective differential protection cannot be realized due to higher transmission delay and communication error rate of the conventional power communication network.
One aspect of the present invention provides a FlexE-based differential protection system, comprising:
the virtual local area network comprises at least two edge nodes and at least one core node, wherein the edge nodes and the core node are FlxeE switches;
the differential protection device is connected to a circuit to be protected and establishes at least one protection area in pair; and each differential protection device is respectively accessed to the virtual local area network through a corresponding edge node, and the virtual local area network individually configures slice channels for the two differential protection devices corresponding to each protection area based on FlxeE to establish communication for transmitting detected electric quantity signals.
Preferably, the FlexE-based differential protection system comprises:
the first differential protection equipment is connected to the first end of the protection area to detect a first electric quantity signal;
a second differential protection device connected to a second end of the protection zone to detect a second electrical quantity signal;
the first differential protection device is connected with a first edge node, the second differential protection device is connected with a second edge node, and the first edge node and the second edge node are connected through at least one core node to form the virtual local area network; the first edge node, the second edge node and the core node are FlxeE switches;
the virtual local area network configures a slice channel based on the FlxeE to establish communication between the first differential protection device and the second differential protection device, and is used for transmitting the first electrical quantity signal and the second electrical quantity signal to perform differential protection.
Preferably, a network tester is further connected and arranged between the edge nodes connected with the two differential protection devices corresponding to each protection zone for detecting the network speed.
Preferably, the differential protection device is connected to the edge node via an RJ45 interface.
Preferably, the slice channel is an MPLS-TP tunnel, and the bandwidth of the slice channel is set to be at least 10M.
Preferably, the system limits the transmission rate between two differential protection devices corresponding to each protection zone to be greater than or equal to 2Mbps, the one-way delay to be less than 20ms, and the communication error rate to be less than 1x10 -6 。
In another aspect, the present invention further provides a FlexE-based differential protection method, where the method is suitable for operating on the above FlexE-based differential protection system, and the method includes:
setting the range of the differential protection devices at two ends of each protection area according to the rated parameters of each protection area in the circuit to be protected and the interval of the rated parameters;
in the running process of the circuit to be protected, each differential protection device collects current parameters of the connected point;
the differential protection devices at two ends of each protection area establish a FlxeE communication slice through the virtual local area network for data communication, mutually send current parameters acquired respectively and calculate differential current;
and if the differential current corresponding to one or more protection areas is larger than the set threshold, performing power-off protection on the corresponding protection areas.
Preferably, the method further comprises:
and testing the communication time delay and the communication error rate between the differential protection devices at two ends of each protection area, and generating an alarm prompt of the corresponding protection area when the communication time delay is higher than a first set value and/or the communication error rate is higher than a second set value.
Preferably, the method further comprises: and summarizing the alarm prompts to generate an alarm log.
In another aspect, the present invention also provides a computer readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the steps of the method as described above.
The invention has the beneficial effects that:
the differential protection system, the differential protection method and the differential protection device based on the Flexe establish a virtual local area network based on the Flexe, establish mutually isolated network slices for the differential protection device to communicate aiming at each communication tunnel, control the communication time delay and the communication error rate between the differential protection devices at two ends of a protection area within a required range, and ensure the smooth realization of the differential protection.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to what has been particularly described hereinabove, and that the above and other objects that can be achieved with the present invention will be more clearly understood from the following detailed description.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. For purposes of illustrating and describing some portions of the present invention, corresponding parts of the drawings may be exaggerated, i.e., may be larger, relative to other components in an exemplary apparatus actually manufactured according to the present invention. In the drawings:
fig. 1 is a schematic structural diagram of a FlexE-based differential protection system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a FlexE-based differential protection system according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments and the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
It is also noted herein that the term "coupled," if not specifically stated, may refer herein to not only a direct connection, but also an indirect connection in which an intermediate is present.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps.
In the electric power communication network, when the differential protection device is used for protecting the electric equipment in the protection range, accurate real-time monitoring can be achieved only when the communication time delay and the communication error rate meet the specified requirements, and the smooth implementation of the differential protection is guaranteed.
The differential protection regards the protected electrical equipment as a node, and then, in normal conditions, the current flowing into the protected equipment is equal to the current flowing out of the protected equipment, and the differential current is equal to zero. When the equipment has a fault, the current flowing into the protected equipment is not equal to the current flowing out of the protected equipment, and the differential current is greater than zero. When the differential current is larger than the setting value of the differential protection device, the upper computer alarms to protect the outlet to act, and the circuit breakers on the two sides of the protected equipment are tripped off, so that the fault equipment is powered off. The basic protection principle of current differential protection is based on the kirchhoff basic current law, the protection can be ideally unitized, the principle is simple, the protection is not influenced by the change of the operation mode, and the operation reliability is improved because the protection devices on the two sides are not connected. If service congestion occurs in the communication transmission networks at the two ends of the differential protection, information transmission delay and even packet loss are increased, and finally, effective differential protection cannot be realized.
It should be noted in advance that the FlexE technology realizes the decoupling of the MAC and PHY layers by introducing FlexE Shim based on IEEE802.3, thereby realizing flexible rate matching. The flexible ethernet is defined based on a Client/Group architecture, and can support mapping and transmission of any plurality of different sub-interfaces (FlexE clients) on any Group of phys (FlexE Group), thereby realizing the functions of bundling, channelization, subrate and the like.
The Flexe Client corresponds to various user interfaces of the network and is consistent with the traditional service interface in the existing IP/Ethernet network. The Flexe Client can be flexibly configured according to bandwidth requirements, supports Ethernet MAC data streams with various rates, such as 10Gbps, 40Gbps, nx25 Gbps and 10M data streams, and also supports nonstandard rate data streams in some scenes, and transmits the data streams to a Flexe Shim layer in a 64B/66B coding mode.
The Flexe Shim is used as an additional logic layer inserted between the MAC and PHY (PCS sublayer) of the traditional Ethernet architecture, and the core architecture of the Flexe technology is realized through a Slot distribution mechanism based on Calendar.
The FlexE Group is essentially the various ethernet PHY layers defined by the IEEE802.3 standard. Due to reuse of the existing Ethernet technology defined by IEEE802.3, the Flexe architecture is further enhanced on the basis of the existing Ethernet MAC/PHY.
The FlexE technology strictly isolates network resources between the fragments, and the resources between the fragments are not preempted. The network segment bearing the relay protection service only serves the relay protection service, resources are shared independently, the relay protection service can be completely prevented from being interfered by other services, and QoS (quality of service) does not need to be deployed in the segment. The fragment can bear a plurality of relay protection services, and the plurality of relay protection services share network resources in the fragment, so that the SLA requirements of the relay protection services are met, and the network resources of the fragment can be reasonably and fully utilized. Meanwhile, the bandwidth required by each layer of network carrying each power service of access, aggregation and core can be estimated according to different network topologies, and enough network resources are reserved for the Flexe fragments carrying each power service.
In order to realize differential protection of electric power equipment based on a Flexe technology, the invention provides a differential protection system, a differential protection method and a differential protection device based on Flexe, so as to eliminate or improve one or more defects in the prior art and solve the problem that effective differential protection cannot be realized due to higher transmission delay and communication error rate of the conventional electric power communication network.
One aspect of the present invention provides a FlexE-based differential protection system, as shown in fig. 1, comprising:
the virtual local area network is composed of at least two edge nodes and at least one core node, and the edge nodes and the core node are FlxeE switches.
The differential protection device is connected to a circuit to be protected and establishes at least one protection area in pair; each differential protection device is respectively accessed to a virtual local area network through a corresponding edge node, and the virtual local area network individually configures slice channels for the two differential protection devices corresponding to each protection area based on FlxeE to establish communication for transmitting detected electric quantity signals.
In this embodiment, the virtual local area network is constructed based on the FlexE technology, where an Edge node (PE node, Provider Edge, operator Edge router) is used to access the user equipment, and a core node (P node, Provider operator backbone router) is used to connect the Edge node, so as to form the virtual local area network.
According to the needs of the circuit to be protected, a plurality of protection areas can be configured, and two sides of each protection area are respectively provided with a differential protection device, or the protection areas are constructed by combining two differential protection devices. Correspondingly, the differential protection device is connected to a specific point in the circuit to be protected to detect a specified electrical parameter, which in this embodiment may be a current. The differential protection equipment detects the current parameters in real time and establishes communication through a virtual local area network for transmission. Based on the principle of differential protection, differential protection devices at two ends of each protection area are connected through a virtual local area network and are isolated from other communication through a Flexe network slice.
The FlexE technology reuses the existing IEEE802.3 Ethernet physical layer standard, realizes a flexible multi-rate interface through lightweight enhancement at an MAC/PCS logic layer, realizes seamless butt joint with an IP technology, and better meets the requirements of large bandwidth, flexible rate, channel isolation and the like under an IP/Ethernet technical system. Due to the adoption of a data block exchange technology based on time slots, the single-node time delay reaches the level of mus in the aspect of forwarding time delay, and the requirements of power grid control service on millisecond-level low time delay and microsecond-level high-precision network time service can be met; since different services are isolated by different time slots, no influence is generated between the different services, and the hard isolation is very easy to realize network slicing. In the invention, the network slices are respectively established between the differential protection devices for communication, so that the communication time delay and the communication error rate can be effectively controlled.
In some embodiments, the FlexE-based differential protection system comprises:
the first differential protection device is connected to the first end of the protection area to detect a first electrical quantity signal.
And the second differential protection device is connected to the second end of the protection area to detect a second electric quantity signal.
The first differential protection equipment is connected with a first edge node, the second differential protection equipment is connected with a second edge node, and the first edge node and the second edge node are connected through at least one core node to form a virtual local area network; the first edge node, the second edge node and the core node are FlxeE switches;
the virtual local area network configures a slice channel based on the FlxeE to establish communication between the first differential protection device and the second differential protection device, and is used for transmitting a first electrical quantity signal and a second electrical quantity signal to perform differential protection.
In this embodiment, structural features of the system are further defined, an independent protection area is established, and the electric quantity signals at two ends of the protection area are detected through the first differential protection device and the second differential protection device.
In some embodiments, a network tester is further connected and arranged between the edge nodes connected with the two differential protection devices corresponding to each protection zone for detecting the network speed.
In this embodiment, the network tester detects the communication quality between the differential protection devices at the two ends of the protection area in real time, and ensures that the communication delay and the communication error rate are within the limit range of the specified requirements. The communication quality between the differential protection devices is ensured, and the differential protection can be realized.
In some embodiments, the differential protection devices are connected to the edge nodes through RJ45 interfaces. RJ45 is a type of information jack (i.e., communications outlet) connector in a wiring system, which consists of a plug (connector, crystal header) and a socket (module), the plug having 8 recesses and 8 contacts.
In some embodiments, the slice channel is an MPLS-TP tunnel, and the bandwidth of the slice channel is set to at least 10M. MPLS-TP, collectively known as MPLS Transport Profile, is a Packet Transport Network (PTN) technology standardized by the International telecommunication Union (ITU-T).
In some embodiments, the system limits the transmission rate between two differential protection devices corresponding to each protection zone to be greater than or equal to 2Mbps, the one-way delay is less than 20ms, and the communication error rate is less than 1x10 -6 。
On the other hand, the invention also provides a FlexE-based differential protection method, which is suitable for the FlexE-based differential protection system to operate, and comprises the following steps of S101-S104:
step S101: and setting the measuring range of the differential protection devices at two ends of each protection area according to the rated parameters of each protection area in the circuit to be protected and the interval of the rated parameters.
Step S102: and in the running process of the circuit to be protected, each differential protection device acquires the current parameters of the connected point.
Step S103: the differential protection devices at two ends of each protection area establish a FlxeE communication slice through a virtual local area network for data communication, mutually transmit the acquired current parameters and calculate the differential current.
Step S104: and if the differential current corresponding to one or more protection areas is larger than the set threshold, performing power-off protection on the corresponding protection areas.
In step S101 of this embodiment, a rated parameter to be detected is first determined based on configuration information of a circuit to be protected to determine a corresponding range, so that the differential protection device can effectively detect a corresponding electrical parameter.
In steps S102 and S103, the differential protection device collects current parameters of the point locations connected, the differential protection devices at the two ends of each protection area perform real-time communication based on the virtual local area network, and the communication slice established by using the floxe technology is isolated from other data to ensure that the communication delay and the communication error rate are lower than the limit values, and the differential current can be calculated according to the current parameters at the two ends of the protection area.
In step S104, a set threshold is compared based on the differential current detected by the differential protection devices at two ends of the protection area, and when the differential current is greater than the set threshold, power-off protection is performed on the corresponding protection area. In other embodiments, the alarm prompt is also synchronized.
In some embodiments, the method further comprises: and testing the communication time delay and the communication error rate between the differential protection devices at two ends of each protection area, and generating an alarm prompt of the corresponding protection area when the communication time delay is higher than a first set value and/or the communication error rate is higher than a second set value. The test operation in the embodiment can be detected by a network tester, and communication quality is detected, so that communication delay and communication error rate are ensured to meet requirements, and fault misinformation caused by poor communication quality is prevented.
In some embodiments, the method further comprises: and summarizing the alarm prompts to generate an alarm log. Through the alarm log, the faults of the circuit to be protected and the differential protection system can be analyzed.
In another aspect, the present invention also provides a computer readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the steps of the method as described above.
The invention is illustrated below with reference to specific examples:
in the embodiment, for the fact that the differential protection transmission line may generate network congestion to generate a large time delay or even packet loss, a differential protection system based on a FlexE bearer architecture is adopted, and the FlexE transmission technology is used for achieving that the differential protector cannot trigger false response due to measurement fault caused by the transmission congestion or packet loss of the communication network.
The transmission system of the differential protection system based on the Flexe bearing framework can be configured with a physical isolation channel based on time slots to connect the differential protection devices at two ends, and the channel is only used for the differential protection devices at the two ends, so that the safety requirement of differential protection is met from a physical layer.
In order to achieve the above objective, the present embodiment adopts the following technical solutions:
the transmission network is built by using a Flexe switch as shown in figure 1, and the transmission network based on the P node and the PE node is formed. The differential protection device a, the differential protection device B, the differential protection device C and the differential protection device D are connected to corresponding interfaces of the PE nodes NE1 and NE3 through RJ45 interfaces. And uniformly configuring virtual channels through a FlexE gateway platform. The path of virtual channel Turnel1 is: 1 port of NE 1-2 port of NE 1-1 port of NE 2-3 port of NE 2-3 port of NE 3-3 port of NE 3. The path of virtual channel Turnel2 is: 3 port of NE 1-4 port of NE 1-2 port of NE 2-4 port of NE 2-4 port of NE 3-4 port of NE 3. EVPL traffic 1 based on MPLS-TP encapsulation is created between port 1 of NE1 and port 3 of NE3, and mapped to a bearer on Turnel 1. EVPL traffic 2 based on MPLS-TP encapsulation is created between port 2 of NE1 and 4 ports of NE3, mapped to a bearer on Turnel 2.
And (4) testing the scheme, and verifying whether the communication between the differential protection device A and the differential protection device B is influenced by other service flows to generate network congestion and packet loss.
Specifically, the embodiment provides a differential protection system building and testing step based on a FlexE bearer architecture, as shown in fig. 2, including:
1) the physical connection part, as shown in fig. 2, builds a transmission network by using a Flexe switch to form the transmission network based on the P node and the PE node. The 1 port of NE1 is connected to the 2 port of NE1 and to the 1 port of NE2 and to the 3 port of NE2 and to the 1 port of NE3 and to the 3 port of NE 3. The 3-port connection of NE1 to NE1 has the 2-port connection of NE2 and the 4-port connection of NE2 has the 2-port connection of NE3 to NE 3.
2) And (4) FlexE Group configuration, and adding the P node and the PE node to the Group through FlexE network management equipment.
3) Two SCLs (slot slices configured by a flexE technology) are configured end to end, and NE1 to NE3 configure two 10M SCLs which are respectively marked as client-NE1-NE3-1 and client-NE1-NE 3-2.
4) VEI (virtual Ethernet interface) configuration
The label is SCL of client-NE1-NE3-1, NE1 source IP is configured to be 111.101.1.1/30, NE3 destination IP is configured to be 111.101.1.2/30; the VLAN number is 1.
The label is SCL of client-NE1-NE3-2, NE1 source IP is configured to be 111.102.1.1/30, NE3 destination IP is configured to be 111.102.1.2/30; the VLAN number is 2.
5) Two MPLS-TP tunnels are configured end to end, tunnels are configured for two SCLs, the type of the tunnels is MPLS-TP, and the tunnels are configured so that data can be transmitted through the tunnels. And adding the configured two tunnels into the Ethernet service manager. And the subsequent service data flow test is facilitated. The tunnel for ports 1-3 of NE1-NE3 is labeled tunnel 1 and the tunnel for ports 3-4 of NE1-NE3 is labeled tunnel 2.
6) Flow testing by network test instrumentation 1
The network test instrument simultaneously and respectively bidirectionally sends test data with the service flow of 2Mbps to the tunnel 1 and the tunnel 2 of the NE1-NE3, and the test result is observed, so that the bidirectional transceiving error rate of the tunnel 1 is less than 1x10 -6 And a delay of less than 20 ms. The bidirectional transmitting-receiving error rate of the tunnel 2 is less than 1x10 -6 And a delay of less than 20 ms.
7) Flow test 2 by network test instrument
Respectively and bidirectionally sending test data with the service flow of 2Mbps to the tunnel 1 of the NE1-NE3 through a network test instrument, simultaneously and bidirectionally sending the test data with the service flow of 100Mbps to the tunnel 2 of the NE1-NE3 through the network test instrument, and observing the test result that the bidirectional transceiving error rate of the tunnel 1 is less than 1x10 -6 And a delay of less than 20 ms. The bidirectional transceiving error rate of the tunnel 2 is more than 1x10 -6 And a delay of greater than 20 ms. The test simulates that the tunnel 2 generates network congestion to generate larger delay and packet loss, and does not influence the communication of the differential protection devices at two sides of the tunnel 1.
As in fig. 2, the differential protection device is connected to the FlexE transmission network and the appropriate IP is configured according to the network segment of step 4). Through actual network access test of differential protection equipment, the Flexe technology is verified to provide support with low delay, high reliability and high bandwidth utilization rate for differential protection services under the condition of fine particles, and the differential protection services are guaranteed not to be influenced by network fluctuation of other services on a Flexe channel.
The embodiment of the invention also provides computer equipment which can comprise a processor, a memory and an image acquisition device, wherein the processor and the memory can be connected through a bus or in other modes. The image acquisition device can be connected with the processor and the memory in a wired or wireless mode.
The processor may be a Central Processing Unit (CPU). The Processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or a combination thereof.
The memory, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the key shielding method of the in-vehicle display device in the embodiment of the present invention. The processor executes various functional applications and data processing of the processor by running non-transitory software programs, instructions and modules stored in the memory, that is, implementing the image color correction method in the above method embodiments.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor, and the like. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and such remote memory may be coupled to the processor via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory and when executed by the processor, perform the FlexE-based differential protection method of the embodiment described in steps S101-S104.
In summary, the FlexE-based differential protection system, the differential protection method and the differential protection device of the present invention establish a virtual local area network based on the FlexE, establish mutually isolated network slices for the differential protection device to communicate with each other for each communication tunnel, control the communication delay and the communication error rate between the differential protection devices at both ends of the protection area within the required range, and ensure the smooth implementation of the differential protection.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the foregoing steps of the edge computing server deployment method. The computer readable storage medium may be a tangible storage medium such as Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, floppy disks, hard disks, removable storage disks, CD-ROMs, or any other form of storage medium known in the art.
Those of ordinary skill in the art will appreciate that the various illustrative components, systems, and methods described in connection with the embodiments disclosed herein may be implemented as hardware, software, or combinations of both. Whether this is done in hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments in the present invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A FlexE-based differential protection system, comprising:
the virtual local area network comprises at least two edge nodes and at least one core node, wherein the edge nodes and the core node are FlxeE switches;
the differential protection device is connected to a circuit to be protected and establishes at least one protection area in pair; and each differential protection device is respectively accessed to the virtual local area network through a corresponding edge node, and the virtual local area network individually configures slice channels for the two differential protection devices corresponding to each protection area based on FlxeE to establish communication for transmitting detected electric quantity signals.
2. Flexe-based differential protection system according to claim 1, characterized in that it comprises:
the first differential protection equipment is connected to the first end of the protection area to detect a first electric quantity signal;
a second differential protection device connected to a second end of the protection zone to detect a second electrical quantity signal;
the first differential protection device is connected with a first edge node, the second differential protection device is connected with a second edge node, and the first edge node and the second edge node are connected through at least one core node to form the virtual local area network; the first edge node, the second edge node and the core node are FlxeE switches;
the virtual local area network configures a slice channel based on the FlxeE to establish communication between the first differential protection device and the second differential protection device, and is used for transmitting the first electrical quantity signal and the second electrical quantity signal to perform differential protection.
3. Flexe-based differential protection system according to claim 1, characterised in that a network tester is also connected and arranged for detecting the wire speed between the edge nodes where the two differential protection devices corresponding to each protection zone are connected.
4. FlexE-based differential protection system according to claim 1, characterized in that the differential protection devices are connected to the edge nodes through RJ45 interfaces.
5. Flexe-based differential protection system according to claim 1, wherein the slice channel is an MPLS-TP tunnel and the bandwidth of the slice channel is set to at least 10M.
6. The Flexe-based differential protection system according to claim 1, wherein the system limits the transmission rate between two differential protection devices corresponding to each protection zone to be greater than or equal to 2Mbps, the one-way delay is less than 20ms, and the communication error rate is less than 1x10 -6 。
7. A FlexE-based differential protection method, adapted to operate on a FlexE-based differential protection system according to any of claims 1 to 6, the method comprising:
setting the range of the differential protection devices at two ends of each protection area according to the rated parameters of each protection area in the circuit to be protected and the interval of the rated parameters;
in the running process of the circuit to be protected, each differential protection device collects current parameters of the connected point;
the differential protection devices at two ends of each protection area establish a FlxeE communication slice through the virtual local area network for data communication, mutually send current parameters acquired respectively and calculate differential current;
and if the differential current corresponding to one or more protection areas is larger than the set threshold, performing power-off protection on the corresponding protection areas.
8. Flexe-based differential protection method according to claim 7, characterized in that said method further comprises:
and testing the communication time delay and the communication error rate between the differential protection devices at two ends of each protection area, and generating an alarm prompt of the corresponding protection area when the communication time delay is higher than a first set value and/or the communication error rate is higher than a second set value.
9. Flexe-based differential protection method according to claim 8, characterized in that said method further comprises: and summarizing the alarm prompts to generate an alarm log.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 7 to 9.
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