CN104486153A - Intelligent substation process level network transmission performance monitoring method based on FPGA - Google Patents
Intelligent substation process level network transmission performance monitoring method based on FPGA Download PDFInfo
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Abstract
The invention provides an intelligent substation process level network transmission performance monitoring method based on FPGA (Field Programmable Gate Array). The method comprises the following steps: a transmitting terminal reserves a flag bit of the message when the MAC (Media Access Control) layer is encapsulated to form frames; a receiving terminal receives the message and issues the message to a cache region of the FPGA; the FPGA checks whether the receiving cache region has the message, if the receiving cache region has the message, the flag bit of the frame is read and the frame is processed; after the message is processed in the FPGA cache region, the message is transmitted to a switching chip. The technical scheme provided by the invention adopts the FPGA manner to acquire the network message performance parameters, control the delay jittering within a protection acceptable determined range (2 ms), and ensure the real time property of the critical service; secondly, the process level network transmission performance monitoring implemented on the switch has the function of identifying the abnormal message transmitted by the access equipment, so as to stop normal forwarding of the corresponding port, not allow the abnormal message to be spread in the network, position the source of the abnormal message, and report warning signals, so that the network reliability is improved.
Description
Technical field
The present invention relates to a kind of network transmission performance monitoring method in the communication of transformer station process layer, specifically relate to a kind of transformer station process layer network transmission performance monitoring method based on FPGA.
Background technology
New Generation of Intelligent transformer station target, the research of intelligent substation network switch applicable cases and New Generation of Intelligent transformer station in 2013 and implementation progress, require further simplified network structure, reducing the construction costs, improve network reliability, improve field adjustable efficiency, strengthen O&M service ability.Optimized network structure, adopts " common network is mouth (access device adopts physical port transmission SV, GOOSE, MMS message to Unified Network) altogether " network configuration, effectively reduces switch quantity." common network is mouth altogether " network configuration needs the network switch to have the ability of identification services message, and network by service message type and service message setup of attribute priority query, can guarantee that the service message that key is applied and time requirement is high preferentially transmits.According to the characteristic analysis of different business, distributed by exchange resource, priority algorithm optimization, control delay jitter in the acceptable scope determined of protection, ensure the real-time of key business.The network switch should have the ability identifying the exception message that access device sends, and stops the normal forwarding of corresponding port, does not allow exception message spread on network, and locate the source of exception message, report and alarm signal.Network switch device state information adopts the modeling of IEC61850 standard, communication network management is included in intelligent substation unified monitoring management system, monitoring system of electric substation can the state information of directly obtaining communication network and switch, as port status Real-Time Monitoring, network traffic analysis etc.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of transformer station process layer network transmission performance monitoring method based on FPGA, the method carries out record by FPGA to the message of Internet Transmission, and process layer switch realizes network performance monitoring: link linking status; Bandwidth occupancy states; Networking abnormity diagnosis, improves network reliability, improves field adjustable efficiency, strengthens O&M service ability.
The object of the invention is to adopt following technical proposals to realize:
The invention provides a kind of transformer station process layer network transmission performance monitoring method based on FPGA, its improvements are, between the MAC layer and exchange chip of transformer station process layer, be provided with FPGA; Described method comprises the steps:
(1) transmitting terminal message reserves the marker bit of message when MAC layer encapsulation framing;
(2) receiving terminal receives message and is issued to the buffer area of FPGA;
(3) FPGA checks and receives buffer area, has the marker bit namely reading frame of message and processes;
(4) message is after the buffer area of FPGA processes, and is sent to exchange chip.
Further, in described step (1), transmitting terminal message comprises transformer station's GOOSE message and SV message; In described step (2), receiving terminal receives GOOSE and SV message, is issued to the buffer area of FPGA before entering the MAC end of exchange chip; In described step (3), FPGA checks and receives buffer area, has GOOSE and SV message namely read the marker bit of frame and process, and adopts FPGA hardware record and reads message information; Message, after FPGA end processes, is sent to the MAC end of exchange chip.
Further, GOOSE and SV message enter the MAC end of exchange chip before monitoring network transmission delay performance, monitoring link connection state, monitoring bandwidth occupancy states, monitoring port forwarding state, monitoring network transmission packet loss and error code and diagnostic network abnormal.
Further, comprised by FPGA monitoring network transmission delay performance: FPGA when message sends in message joining day information, calculate the difference of the temporal information of current time and message inbound port when message arrives destination address, obtain Internet Transmission time delay; Setting network transmission delay threshold value, when Real-time Delay exceedes Internet Transmission delay threshold, encapsulation warning message, and be uploaded to webmaster end.
Further, monitor link connection state by FPGA to comprise:
Described FPGA sets up inbound port connection status monitoring in message, and policing port connects or the information of disconnection, when port links state changes, and encapsulation warning message, and be uploaded to webmaster end.
Further, monitor bandwidth occupancy states by FPGA and comprise: receive message M by being recorded in time T and sending message bag quantity N, and the frame length S of message, calculate and taken receiving terminal and transmitting terminal bandwidth B
rand B
t:
Receiving terminal bandwidth occupancy: B
r=(M*S)/T 1.;
Transmitting terminal broadband takies: B
t=(N*S)/T 2..
Further, comprised by FPGA monitoring port forwarding state: in forwarding state between forward and block or when changing between forward and discard, encapsulation warning message, and be uploaded to webmaster end.
Further, comprised by FPGA monitoring network transmission packet loss and error code: statistics number of dropped packets, and calculate packet loss; Add up number of bit errors simultaneously, calculate the error rate, setting packet loss threshold value and bit error rate threshold, when packet loss exceedes setting packet loss threshold value or the error rate exceedes setting bit error rate threshold, encapsulation warning message, and be uploaded to webmaster end.
Further, by link connection state, port repeat state and bandwidth occupancy states judge switch whether have service message to import into and data flow whether normal, when communication network breaks down, whether diagnosis is exchange fault, and then diagnostic network is abnormal.
Compared with immediate prior art, the excellent effect that technical scheme provided by the invention has is:
First method provided by the invention adopts FPGA to read process layer GOOSE and SV message performance parameter, and fast operation, precision are high, controls delay jitter in the acceptable scope determined of protection (2ms), ensures the real-time of key business; Secondly process-level network transmission performance monitoring switch realized, there is the ability identifying the exception message that access device sends, stop the normal forwarding of corresponding port, exception message is not allowed to spread on network, and locate the source of exception message, report and alarm signal, improves network reliability.
Accompanying drawing explanation
Fig. 1 is network transfer delay provided by the invention monitoring schematic diagram;
Fig. 2 is monitoring link linking status schematic diagram provided by the invention;
Fig. 3 is monitoring bandwidth occupancy states schematic diagram provided by the invention;
Fig. 4 is monitoring port forwarding state schematic diagram provided by the invention;
Fig. 5 is Internet Transmission error code provided by the invention, packet loss monitoring schematic diagram;
Fig. 6 is Network Abnormal provided by the invention diagnosis schematic diagram;
Fig. 7 is the flow chart of the transformer station process layer network transmission performance monitoring method based on FPGA provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The present invention designs FPGA circuit between the MAC layer and exchange chip of transformer station process layer.The invention provides a kind of transformer station process layer network transmission performance monitoring method based on FPGA, on the basis of real-time ensureing key business, can exception message be identified, improve network reliability.As shown in Figure 7, method adopts following technical scheme to the flow chart of the method:
(1) transmitting terminal GOOSE and SV message message reserve the marker bit of message when MAC layer encapsulation framing;
(2) receiving terminal receives GOOSE and SV message, is issued to FPGA buffer area before entering the MAC of exchange chip;
GOOSE and SV message enter the MAC end of exchange chip before monitoring network transmission delay performance, monitoring link connection state, monitoring bandwidth occupancy states, monitoring port forwarding state, monitoring network transmission packet loss and error code and diagnostic network abnormal.
Comprised by FPGA monitoring network transmission delay performance: FPGA when message sends in message joining day information, calculate the difference of the temporal information of inbound port in current time and message when message arrives destination address, obtain Internet Transmission time delay.Setting network transmission delay threshold value, when Real-time Delay exceedes threshold value, encapsulation warning message, is uploaded to webmaster end; Network transfer delay monitoring schematic diagram as shown in Figure 1.
Monitor link connection state by FPGA to comprise: FPGA sets up port connection state monitoring, provide policing port to connect or disconnect, when port links state changes, encapsulation warning message, is uploaded to webmaster end; Monitoring link linking status schematic diagram as shown in Figure 2.
Monitor bandwidth occupancy states by FPGA to comprise: receive message M by being recorded in time T and sending message bag quantity N, and the frame length S of message, calculate and taken receiving terminal and transmitting terminal bandwidth B
rand B
t: monitoring bandwidth occupancy states schematic diagram is as shown in Figure 3.
Receiving terminal bandwidth occupancy: B
r=(M*S)/T 1.;
Transmitting terminal broadband takies: B
t=(N*S)/T 2..
By FPGA monitoring port forwarding state: when forwarding state changes between forward and block or discard, encapsulation warning message, is uploaded to webmaster end; Monitoring port forwarding state schematic diagram as shown in Figure 4.
Comprised by FPGA monitoring network transmission packet loss and error code: statistics number of dropped packets, and calculate packet loss; Add up number of bit errors simultaneously, calculate the error rate, setting packet loss threshold value and bit error rate threshold, when packet loss exceedes setting packet loss threshold value or the error rate exceedes setting bit error rate threshold, encapsulation warning message, and be uploaded to webmaster end.Internet Transmission error code, packet loss monitoring schematic diagram as shown in Figure 5.
Diagnostic network is abnormal to be comprised: by port repeat state and bandwidth occupancy states, judge switch whether have service message to import into and data flow whether normal, whether when communication network breaks down, diagnosing is exchange fault.Network Abnormal diagnosis schematic diagram as shown in Figure 6.
(3) FPGA checks and receives buffer area, has GOOSE and SV message namely read the marker bit of frame and process, have employed FPGA hardware to record and read message information.
(4) message is after FPGA end processes, and is sent to the MAC end of exchange chip.
Transformer station process layer network transmission performance monitoring method based on FPGA provided by the invention, carries out record by FPGA to the message of Internet Transmission, process layer switch realizes network performance monitoring: link linking status; Bandwidth occupancy states; Networking abnormity diagnosis, improves network reliability, improves field adjustable efficiency, strengthens O&M service ability.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; although with reference to above-described embodiment to invention has been detailed description; those of ordinary skill in the field still can modify to the specific embodiment of the present invention or equivalent replacement; these do not depart from any amendment of spirit and scope of the invention or equivalent replacement, are all applying within the claims of the present invention awaited the reply.
Claims (9)
1., based on a transformer station process layer network transmission performance monitoring method of FPGA, it is characterized in that, between the MAC layer and exchange chip of transformer station process layer, be provided with FPGA; Described method comprises the steps:
(1) transmitting terminal message reserves the marker bit of message when MAC layer encapsulation framing;
(2) receiving terminal receives message and is issued to the buffer area of FPGA;
(3) FPGA checks and receives buffer area, has the marker bit namely reading frame of message and processes;
(4) message is after the buffer area of FPGA processes, and is sent to exchange chip.
2. monitoring method as claimed in claim 1, it is characterized in that, in described step (1), transmitting terminal message comprises transformer station's GOOSE message and SV message; In described step (2), receiving terminal receives GOOSE and SV message, is issued to the buffer area of FPGA before entering the MAC end of exchange chip; In described step (3), FPGA checks and receives buffer area, has GOOSE and SV message namely read the marker bit of frame and process, and adopts FPGA hardware record and reads message information; Message, after FPGA end processes, is sent to the MAC end of exchange chip.
3. monitoring method as claimed in claim 2, it is characterized in that, GOOSE and SV message enter the MAC end of exchange chip before monitoring network transmission delay performance, monitoring link connection state, monitoring bandwidth occupancy states, monitoring port forwarding state, monitoring network transmission packet loss and error code and diagnostic network abnormal.
4. monitoring method as claimed in claim 3, it is characterized in that, comprised by FPGA monitoring network transmission delay performance: FPGA when message sends in message joining day information, calculate the difference of the temporal information of current time and message inbound port when message arrives destination address, obtain Internet Transmission time delay; Setting network transmission delay threshold value, when Real-time Delay exceedes Internet Transmission delay threshold, encapsulation warning message, and be uploaded to webmaster end.
5. monitoring method as claimed in claim 3, it is characterized in that, monitor link connection state by FPGA to comprise: described FPGA sets up inbound port connection status monitoring in message, policing port connects or the information of disconnection, when port links state changes, encapsulation warning message, and be uploaded to webmaster end.
6. monitoring method as claimed in claim 3, is characterized in that, monitors bandwidth occupancy states comprise by FPGA: receive message M by being recorded in time T and sending message bag quantity N, and the frame length S of message, calculates and has taken receiving terminal and transmitting terminal bandwidth B
rand B
t:
Receiving terminal bandwidth occupancy: B
r=(M*S)/T 1.;
Transmitting terminal broadband takies: B
t=(N*S)/T 2..
7. monitoring method as claimed in claim 3, be is characterized in that, comprised: in forwarding state between forward and block or when changing between forward and discard by FPGA monitoring port forwarding state, encapsulation warning message, and is uploaded to webmaster end.
8. monitoring method as claimed in claim 3, is characterized in that, is comprised by FPGA monitoring network transmission packet loss and error code: statistics number of dropped packets, and calculates packet loss; Add up number of bit errors simultaneously, calculate the error rate, setting packet loss threshold value and bit error rate threshold, when packet loss exceedes setting packet loss threshold value or the error rate exceedes setting bit error rate threshold, encapsulation warning message, and be uploaded to webmaster end.
9. monitoring method as claimed in claim 3, it is characterized in that, by link connection state, port repeat state and bandwidth occupancy states judge switch whether have service message to import into and data flow whether normal, when communication network breaks down, whether diagnosis is exchange fault, and then diagnostic network is abnormal.
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| CN108965031A (en) * | 2018-08-21 | 2018-12-07 | 北京东土科技股份有限公司 | Interchanger mistake packet restorative procedure, device, interchanger and storage medium |
| CN109039552A (en) * | 2018-09-20 | 2018-12-18 | 郑州云海信息技术有限公司 | A kind of data reconstruction method and device |
| CN109639505A (en) * | 2019-01-07 | 2019-04-16 | 南京南瑞继保电气有限公司 | A kind of Substation Process layer network device and its image feature implementation method |
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| CN112039686A (en) * | 2019-06-03 | 2020-12-04 | 杭州海康威视系统技术有限公司 | Data stream transmission control method and device, monitoring equipment and storage medium |
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| CN115766520A (en) * | 2022-11-18 | 2023-03-07 | 许昌许继软件技术有限公司 | Data transmission performance test system and test method of end-to-end network |
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| CN112039686A (en) * | 2019-06-03 | 2020-12-04 | 杭州海康威视系统技术有限公司 | Data stream transmission control method and device, monitoring equipment and storage medium |
| CN112039686B (en) * | 2019-06-03 | 2023-08-04 | 杭州海康威视系统技术有限公司 | Data stream transmission control method, device, monitoring equipment and storage medium |
| CN112152878A (en) * | 2020-09-15 | 2020-12-29 | 国网山东省电力公司滨州供电公司 | Monitoring and management method, system, terminal and storage medium for digital channel of transformer substation |
| CN115766520A (en) * | 2022-11-18 | 2023-03-07 | 许昌许继软件技术有限公司 | Data transmission performance test system and test method of end-to-end network |
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