CN102932167A - Information stream control method and system for improving relay protection reliability of intelligent substation - Google Patents
Information stream control method and system for improving relay protection reliability of intelligent substation Download PDFInfo
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Abstract
The invention relates to an information stream control method and system for improving the relay protection reliability of an intelligent substation. The information system control system comprises a message capturing module, a characteristic quantity analysis module and a fault mode identification module which are connected in sequence by a data line, wherein the characteristic quantity analysis module is further externally connected with a database module, the fault mode identification module is externally connected with a characteristic quantity fixed value setting module and the database module, and the fault mode identification module respectively outputs a control module and an alarm module. According to the information stream control method and system disclosed by the invention, control measures can be taken by judging a fault mode of a process level network information stream in accordance with different mode information, improvement of the transmission reliability of the process level network information stream is facilitated, furthermore, various performances of relay protection equipment of the intelligent substation are improved, the automation level of a secondary system is improved and favorable terms are provided for safety operation of the intelligent substation.
Description
Technical field
The present invention relates to a kind of information flow control system that improves the intelligent substation reliability of relay protection.The invention still further relates to the information flow control method of the improved intelligent substation reliability of relay protection that adopts described control system.
Background technology
Relay protection of power system has four property requirements of selectivity, quick-action, sensitivity, reliability.After Microcomputer Protection was changed, the performance of relaying protection was enhanced.Realize the protection and control of primary equipment between the secondary device by information exchange, this moment occurred a kind of flow with beared information function---information flow.Adopt cable hard link mode that the equipment that needs carry out the information flow exchange is connected under the Microcomputer Protection pattern; each information flow has exclusive passage; and information is transmitted with dipped beam speed, and the reliability of information flow does not form outstanding contradiction with the performance requirement of relaying protection under the pattern of Microcomputer Protection.
Intelligent substation is introduced Ethernet and is replaced original hard stube cable and carry out the communication of information between the equipment take digitized message as carrier, the consumption of cable had both been saved in this change, save again complicated wiring process, strengthened simultaneously the information processing capability of information sharing level and equipment self between the equipment.But information flow becomes uncertain process-level network link transmission by the transmission of the dedicated channel under the Microcomputer Protection pattern; simultaneously because the impact of many uncertain factors on the process-level network, also so that the reliability of information flow has proposed great challenge to the performance of relaying protection.
Consider the selectivity of relaying protection and the inside criterion that sensitivity depends primarily on equipment, what relaying protection was subjected to that the network sharing mode has the greatest impact is quick-action and reliability.Quick-action refers to that relay protection function can excise fault rapidly, the operating time that the minimizing user nonserviceables and the damaged condition of dwindling fault element.And reliability has been when having referred to occur in the protection range of protective device regulation fault that it should move, and it should miss operation, and in other cases not malfunction.The reliability of information stream transmission directly affects reliability of relay--protection.Therefore, whether intelligent substation can be applicable to the application requirements of the high reliability of the automated systems such as relaying protection, and can information flow realize that the transmission of reliability is the most important thing of research.
The network carrier of information flow is mainly station level network and process-level network, and wherein the reliability requirement of the information flow on the station level network is much lower with respect to process-level network, so this method is mainly in process-level network.Information flow is produced by secondary device, is transferred to another secondary device by process-level network, for most of secondary devices, is the producer of information flow, also is the user of information flow.Information flow can be real-time transmitting depend on that on the one hand process-level network self can bear the ability of external disturbance; whether reasonable etc. such as the tissue morphology of relaying protection and networking mode; depend on the other hand the regulating power of process-level network under disturbing, namely realize various unfavorable factors are realized effective information flow control.
The technical scheme of prior art one:
When Ethernet exchanging control circuit port working during at semiduplex mode, Carrier Sense Multiple Access/collision detection (CSMA/CD) algorithm that meets the IEEE802.3 agreement, can realize the flow control of implicit expression, namely adopt back pressure technology (Back Pressure) to prevent overflowing of buffering area, before the transmit leg data arrive, take certain action, stop transmit leg to send data.
The back pressure technology is that Switch controller sends a kind of pseudo-collision alarm technology.Back pressure technology usually basis realizes with the capacity ratio of buffering area, when reaching a predefined ratio with buffer pool size, port will generate block signal according to this threshold value, and when the freebuf capacity surpasses another lower ratio, port will be cancelled block signal.In the network segment at congested port place, the transmission of block signal can make ports all in this network segment can both detect conflict, wait for block signal finish after transmitting data frame again, thereby stop more collision, supspended data transfer, made the space of buffering area obtain discharging.
Implementation method has two kinds:
The 1st kind of method is to force to send one group by 32～96 block signals that consist of (Jam Signal) at the port that produces obstruction, this group block signal produces with the frame that port will receive conflicts, after the link transmit leg is found conflict, will wait for that one section retreats the time and resends frame again.If again find conflict, continue to retreat etc. to be sent.If the link transmit leg does not also send frame after attempting sending 16 times, this frame can be abandoned.Although the transmission that this method can deferred frame is controlled flow, if the congested of during this period of time inner port that retreats at the link transmit leg removed, transmit leg must wait for that the time of retreating could send frame later, and this will cause the free time of link.
The 2nd kind of method be occur congested after, congested port sends block signal, and link the other side detects after the conflict transmission with pause frame, after the congestion state of congested port is cancelled, congested port stops to send block signal, and this moment, link the other side can restart to send frame.This method makes transmit leg in time send Frame, avoids the wait that retreats of transmit leg, thereby improves link utilization.
But existing technology one has two large shortcomings: the one, the control strategy in the excessive situation of flow only is provided, and then can't take corresponding measure for other abnormal condition; The 2nd, this control strategy is to put forward for the normal operation of tackling communication Ethernet, main application is not intelligent substation, so the control strategy that puts forward lacks specific aim, can't satisfy the demand for control of Substation process-level network information flow fully.
The technical scheme of prior art two:
The network message analyzer be a kind of be directed to intelligent substation design have GOOSE message, a network equipment of the record of the messages such as sampled value, parsing and historical report query function.The network message analyzer can provide for the operations staff window of the information such as real time monitoring network message content and flow, and the foundation of analysis is provided for the O﹠M personnel after accident.
The shortcoming of prior art two is: the effect of network message analyzer in network is limited to record and analyzes message; do not judge and carry out control for different network conditions; so its effect to reliability of relay protection is the process of an open loop, be unfavorable for the raising of reliability.
Below be some abbreviations and the Key Term definition of using in the literary composition:
GOOSE-is general in the transformer substation case object, the SV-sampled value, and the IED-intelligent electronic device, the APPID application identities, the LD-logical device, GoCB-GOOSE controll block, stNum-event sequence number, sqNum-sends sequence number.
Summary of the invention
First technical problem to be solved by this invention just provides a kind of information flow control system that improves the intelligent substation reliability of relay protection.
Second technical problem to be solved by this invention just provides the information flow control method of the raising intelligent substation reliability of relay protection that adopts above-mentioned control system.
Information flow control method and the system of raising intelligent substation reliability of relay protection of the present invention; all can take corresponding measure in the excessive situation of flow and other abnormal condition; and the control strategy that puts forward is pointed; satisfy the demand for control of Substation process-level network information flow fully; make process-level network in the situation of abnormal; can take corresponding control measure to keep system stability according to different network states; still can keep as much as possible its reliability; guarantee information flows real-time and transmitting on the whole, and then satisfies the performance requirement of relaying protection.
Solve above-mentioned first technical problem, the information flow control system of raising intelligent substation reliability of relay protection of the present invention is characterized in that: comprising:
The message capturing module, characteristic quantity parsing module and the Fault Pattern Recognition module that connect with data wire successively, also external data library module, Fault Pattern Recognition module external characteristic quantity fixed value adjusting module and database module of characteristic quantity parsing module wherein, the Fault Pattern Recognition module is output control module and alarm module respectively;
The message capturing module is used for the message on the capture network, and sends the message that captures to the characteristic quantity parsing module by interface; The characteristic quantity parsing module is used for resolving various messages on the network according to the information that database module provides, and obtains relevant message information as characteristic quantity, and the value of each characteristic quantity is deposited in the middle of the database module, calls analysis for the Fault Pattern Recognition module; The Fault Pattern Recognition module is used for the information by the analytical database module, and the fault mode of various messages is made evaluation and deposited pattern information in database module, and the identification of fault mode is leaned on is judgement to the feature value; Characteristic quantity fixed value adjusting module is used to pattern discrimination that foundation is provided, and control module determines the control strategy that needs are taked according to pattern information, perhaps by alarm module to operations staff's alarm.
One of following dual mode is adopted in the connection of described message capturing module: the one, be integrated in switch inside, and the message capturing module is connected with each port of switch; The 2nd, independently and with the mirror port of switch be connected, the message that switch receives other all of the ports copies a to mirror port.
Described characteristic quantity parsing module: comprise type of message differentiation submodule, GOOSE correlated characteristic amount analyzing sub-module and sampled value correlated characteristic amount parsing module, type of message is differentiated the output that submodule receives the message capturing module, exports to respectively afterwards GOOSE correlated characteristic amount analyzing sub-module and sampled value correlated characteristic amount parsing module; The characteristic quantity parsing module is used for the value that GOOSE message that process-level network is transmitted and SV message resolve to obtain characteristic quantity.
Described Fault Pattern Recognition module: the Traffic Anomaly that comprises successively connection is judged submodule and event sequence number, is sent sequence number and sampled value counting differentiation submodule; Traffic Anomaly is judged the external characteristic quantity fixed value adjusting of submodule module; Traffic Anomaly judges that the input of submodule connects the output of GOOSE correlated characteristic amount analyzing sub-module and sampled value correlated characteristic amount parsing module; The event sequence number, send sequence number and output that sampled value counting is differentiated submodule then respectively link control module and alarm module.
Solve above-mentioned second technical problem, adopt the information flow control method of the raising intelligent substation reliability of relay protection of above-mentioned control system, may further comprise the steps:
The message capturing module message switching function that the S1 control system relies on switch receives GOOSE message and SV message;
The S2 control system is according to the analytic method that records in the database module, the characteristic quantity parsing module is resolved the entrained APPID of these two kinds of messages, packet counting information and the controll block information quoted, the final characteristic quantity information table that forms deposits in the database module;
The Fault Pattern Recognition module of S3 control system is at first by judging whether flow judges whether the situation of Traffic Anomaly within the threshold value of adjusting, if occuring, Traffic Anomaly then further judges inflow-rate of water turbine or low discharge by content, if inflow-rate of water turbine state, then carry out the inflow-rate of water turbine protection, the protection EO after, with report the test to the operations staff; If the low discharge protection is then carried out in low discharge protection, behind the protection EO, with report the test to the operations staff;
If the S4 flow is normal, judge then whether message discontinuous situation occurs, if find that message is discontinuous, then further judging discontinuous is GOOSE message or SV message, if the GOOSE message, then to operations staff's alarm, if the words of SV message, then by Lagrange interpolation formula, the sampled value information that the message that lacks carries is estimated then alarm according to sampled value information before;
If the S5 message is continuous, then finish this control operation circulation, begin next control operation circulation.
The APPID that two kinds of messages described in the described step S2 are entrained and the count information of message refer to, GOOSE message and SV message all contain APPID, the APPID of GOOSE message at 0x0 between the 0x3FFF, identified uniquely one road GOOSE, the APPID of SV message at 0x4000 between the 0x7FFF, identified uniquely one road adopted value, APPID is the major key that forms information table;
Described characteristic quantity parsing module is resolved and is comprised following content:
To the GOOSE message: adopt retransmission mechanism to send by IEC 61850 regulations, in two kinds of situation:
⑴ in situation about occuring without transformer substation case, and the GOOSE message is retransmitted the GOOSE message with the unit constant time interval, and the content of each bar message is identical, and the sqNum attribute that sends sequence number that different is in the message progressively increases progressively along with each repeating transmission message;
⑵ constantly send GOOSE message after article one is upgraded at T1 after having new transformer substation case to occur, in the message except corresponding state information changes, event sequence number stNum attribute increases by 1, the sqNum zero clearing New count of laying equal stress on, and then message is with interval tS=2N * S (N=0,1,2 ..., S=1ms) repeating transmission has identical information but the different GOOSE message of sequence count, i.e. T1=1ms, T2=2ms, T3=4ms ..., until the interval stabilizes to T0=500ms;
For example: to the SV message: transmission frequency sends according to different sample rates, whenever send a SV message to have corresponding counting operation, and the scope of counting is relevant with sample rate, and sample count increases progressively from 0 to sample frequency, makes zero in every whole second; At every cycle 80 points of sampling, under the 50HZ frequency: sample count is at 0-〉3999 increase progressively; Sample count was 0 in every whole second, 4000 SV messages of per second transmission;
Resolve the controll block path of GOOSE message and the sampled value ID of SV message:
GOOSE controll block path is the full name path that begins from LD, is the unique pathname of GoCB in the LLN0 action scope, has indicated the logical device that sends this GOOSE message; Sampled value ID is the unique identification of sampled value buffering area, refreshes relevantly with sampled value, has indicated the logical device that sends this SV message.
These information make things convenient for control system by analytic message the equipment that sends message to be controlled.
Just can form information as shown in table 1 to above three partial informations after being parsed, deposit database module in.
Table 1 packet parsing information table
(a) GOOSE message information table
(b) SV message information table
| Message APPIDID | Sample count | SV sampled value ID |
| SV1 | 40 | |
| SV2 | 550 | |
| …… | …… | |
| SVn | 700 |
Among the described step S3, the Fault Identification of Fault Pattern Recognition module comprises following content:
Analysis result by the characteristic quantity parsing module is constantly differentiated following 5 kinds of patterns in conjunction with the normal discharge threshold value of adjusting in advance simultaneously, then state information is sent to control module if abnormal flow status occurs, carries out corresponding control operation by this module:
It is 3 large classes that Traffic-pattern is divided into, and Traffic Anomaly, flow are normal but message is discontinuous, normal condition, and following pattern 1,2 belongs to Traffic Anomaly, and it is normal but message is discontinuous that mode 3,4 belongs to flow, and pattern 5 belongs to normal condition:
1) stNum(event sequence number) variation is too fast, and perhaps sqNum(sends sequence number) increase in the mode that surpasses normal frequency, the information flow-rate that causes equipment to send is excessive; Sample count increases in the mode that surpasses normal frequency, and the information flow-rate that causes equipment to send is excessive; Flow is higher than the threshold value of normal discharge, and this state is called the information inflow-rate of water turbine;
2) sqNum(sends sequence number) increase and count continuously in the mode that is lower than normal frequency, or do not increase, cause information flow-rate excessively low; Sample count increases in the mode that is lower than normal frequency and counts continuously, or does not increase, and causes information flow-rate excessively low; Flow is lower than the threshold value of normal discharge, and this state is called the information low discharge;
3) stNum(event sequence number) or sqNum(send sequence number) occur to jump change, information flow is discontinuous, it is discontinuous that this state is called GOOSE stream;
4) variation of jumping appears in sample count, and information flow is discontinuous, and it is discontinuous that this state is called SV stream;
5) stNum(event sequence number), sqNum(sends sequence number) and sample count normally increase progressively, information flow is normal.
Described protection operation is responsible for controlling accordingly and/or alarm operation according to different patterns by control module and alarm module with alarm:
For pattern 1), the equipment that will send abnormal flow (inflow-rate of water turbine) temporarily cuts away from network, the excision here is one of in the following way: 1. a kind of can not be as circuit breaker physically with equipment and Network Isolation, but utilize in logic Spanning-Tree Protocol to disconnect this paths or the mode of attacking by imitation ARP so that the message of equipment can't send to network gets on; 2. another kind is that starting relay cuts off device power supply (DPS), thereby plays automatically, rapidly, selectively fault element is excised from network, guarantees that other fault-free parts recover rapidly normal operation; Inflow-rate of water turbine protection inquiry GOOSE controll block path judges that unusual high flow capacity is which logical device by which IED causes, thus the port flow that cuts off this logical device;
For pattern 2), switch sends a simple request message to IED equipment, if within official hour, do not receive the response message, can judge that then fault has occured for this link or this IED equipment, and give a warning, the notice O﹠M personnel overhaul this circuit and equipment;
For mode 3), the mode of this state by alarm sent to the operations staff, different alarm signals consists of the outlet data collection;
For pattern 4), if discontinuous situation occurs in the information flow of SV message, then control system need be passed through Lagrange interpolation formula, according to sampled value information before the sampled value information that the message that lacks carries is estimated, in order to drop to the impact of the discontinuous generation of message minimum.
Normal frequency during the described sqNum of sending sequence number increases in the mode that surpasses normal frequency refers to: 4000 SV messages of per second transmission; Normal frequency during sample count increases in the mode that surpasses normal frequency refers to: at every cycle 80 points of sampling; The threshold value of normal discharge refers to: have transformer substation case GOOSE to produce, and the transformer substation case GOOSE message of all contingent trip signals, control signal and status information of equipment at synchronization with cycle T
NSend together, the SV message still sends with the fixed cycle, and the maximum when this moment, information flow-rate was the normal steady operation of process-level network multiply by the threshold value that the nargin coefficient is normal discharge.
Beneficial effect: the present invention can be for passing through the present fault mode of deterministic process layer network information flow; and take control measure according to different pattern informations; help to improve the reliability of process-level network information stream transmission; and then the properties of raising relay protection device; improve the automatization level of electrical secondary system, for the safe operation of intelligent substation provides favourable condition.
Description of drawings
Fig. 1 is information flow control system structure chart;
Fig. 2 is the retransmission mechanism schematic diagram of GOOSE message;
Fig. 3 is inflow-rate of water turbine protection schematic diagram;
Fig. 4 is low discharge protection schematic diagram;
Fig. 5 is the realization flow figure of this method;
Fig. 6 is syllogic inflow-rate of water turbine protection schematic diagram.
Embodiment
The information flow control system embodiment of raising reliability of relay protection of the present invention; as shown in Figure 1; comprise the message capturing module, characteristic quantity parsing module and the Fault Pattern Recognition module that connect with data wire successively; also external data library module, Fault Pattern Recognition module external characteristic quantity fixed value adjusting module and database module of characteristic quantity parsing module wherein; the Fault Pattern Recognition module is output control module and alarm module respectively, and database module shares.
The message capturing module is the network interface that the information flow control system is responsible for inputting, message on the charge capture network, and send the message that captures to the characteristic quantity parsing module by interface, the characteristic quantity parsing module is responsible for resolving various messages on the network according to the information that database module provides, obtain relevant message information as characteristic quantity, and the value of each characteristic quantity is deposited in the middle of the database module, call analysis for the Fault Pattern Recognition module, the Fault Pattern Recognition module is by the information in the analytical database module, the fault mode of information flow (being various messages) is made evaluation and deposited pattern information in database module, the identification of fault mode is leaned on is judgement to the feature value, characteristic quantity fixed value adjusting module provides foundation for pattern discrimination, control module determines the control strategy that needs are taked according to pattern information, perhaps by alarm module to operations staff's alarm.
Because switch is the composition core of process-level network, realize its function so need to rely on switch, the message capturing module has two kinds of implementations: the one, be integrated in switch inside, the message capturing module is connected with each port of switch; The 2nd, independently and with the mirror port of switch be connected, the message that switch receives other all of the ports copies a to mirror port.
The characteristic quantity parsing module is responsible for value that the GOOSE message that transmits in the process-level network and SV message are resolved to obtain characteristic quantity, it comprises type of message differentiation submodule, GOOSE correlated characteristic amount analyzing sub-module and sampled value correlated characteristic amount parsing module, type of message is differentiated the output that submodule receives the message capturing module, exports to respectively afterwards GOOSE correlated characteristic amount analyzing sub-module and sampled value correlated characteristic amount parsing module; The characteristic quantity parsing module is responsible for value that the GOOSE message that transmits in the process-level network and SV message are resolved to obtain characteristic quantity.
The Fault Pattern Recognition module: the Traffic Anomaly that comprises successively connection is judged submodule and event sequence number, is sent sequence number and sampled value counting differentiation submodule; Traffic Anomaly is judged the external characteristic quantity fixed value adjusting of submodule module; Traffic Anomaly judges that the input of submodule connects the output of GOOSE correlated characteristic amount analyzing sub-module and sampled value correlated characteristic amount parsing module; The event sequence number, send sequence number and output that sampled value counting is differentiated submodule then respectively link control module and alarm module.
Referring to Fig. 5, adopt the information flow control method of the raising reliability of relay protection of above-mentioned control system, may further comprise the steps:
The message capturing module message switching function that the S1 control system relies on switch receives GOOSE message and SV message;
The S2 control system is according to the analytic method that records in the database module, the characteristic quantity parsing module is resolved the entrained APPID of these two kinds of messages, packet counting information and the controll block information quoted, the final characteristic quantity information table that forms deposits in the database module;
The Fault Pattern Recognition module of S3 control system is at first by judging whether flow judges whether the situation of Traffic Anomaly within the threshold value of adjusting, if occuring, Traffic Anomaly then further judges inflow-rate of water turbine or low discharge by content, if inflow-rate of water turbine state, then carry out the inflow-rate of water turbine protection, the protection EO after, with report the test to the operations staff; If the low discharge protection is then carried out in low discharge protection, behind the protection EO, with report the test to the operations staff;
If the S4 flow is normal, judge then whether message discontinuous situation occurs, if find that message is discontinuous, then further judging discontinuous is GOOSE message or SV message, if the GOOSE message, then to operations staff's alarm, if the words of SV message, then by Lagrange interpolation formula, the sampled value information that the message that lacks carries is estimated then alarm according to sampled value information before;
If the S5 message is continuous, then finish this control operation circulation, begin next control operation circulation.
Characteristic quantity among the step S2 comprises two parts: the APPID of message and the count information of message, GOOSE message and SV message all contain APPID, the APPID of GOOSE message at 0x0 between the 0x3FFF, identified uniquely one road GOOSE, the APPID of SV message at 0x4000 between the 0x7FFF, identified uniquely one road adopted value, APPID is the major key that forms information table such as table 1;
The characteristic quantity parsing module is resolved and is comprised following content:
To the GOOSE message: adopt retransmission mechanism to send by IEC 61850 regulations, in two kinds of situation:
⑴ in situation about occuring without transformer substation case, and the GOOSE message is retransmitted the GOOSE message with the unit constant time interval, and the content of each bar message is identical, and the sqNum attribute that sends sequence number that different is in the message progressively increases progressively along with each repeating transmission message;
⑵ such as Fig. 2, constantly send GOOSE message after article one is upgraded at T1 after having new transformer substation case to occur, except corresponding state information changed, event sequence number stNum attribute increased by 1, the sqNum zero clearing New count of laying equal stress in the message, then message is with interval tS=2N * S (N=0,1,2 ... S=1ms) repeating transmission has identical information but the different GOOSE message of sequence count, be T1=1ms, T2=2ms, T3=4ms,, until the interval stabilizes to T0=500ms;
Resolve the controll block path of GOOSE message and the sampled value ID of SV message:
GOOSE controll block path is the full name path that begins from LD, is the unique pathname of GoCB in the LLN0 action scope, has indicated the logical device that sends this GOOSE message; Sampled value ID is the unique identification of sampled value buffering area, refreshes relevantly with sampled value, has indicated the logical device that sends this SV message.
These information make things convenient for control system by analytic message the equipment that sends message to be controlled.
Just can form packet parsing information table information as shown in table 1 to above three partial informations after being parsed, deposit database module in.
Table 1 packet parsing information table
(c) GOOSE message information table
(d) SV message information table
| Message APPIDID | Sample count | SV sampled value ID |
| SV1 | 40 | |
| SV2 | 550 | |
| …… | …… | |
| SVn | 700 |
In step S3, the Fault Identification of Fault Pattern Recognition module comprises following content:
Analysis result (being packet parsing information table table 1) by the characteristic quantity parsing module is constantly differentiated following 5 kinds of patterns in conjunction with the normal discharge threshold value of adjusting in advance simultaneously, then state information is sent to control module if abnormal flow status occurs, carries out corresponding control operation by this module:
It is 3 large classes that Traffic-pattern is divided into, and Traffic Anomaly, flow are normal but message is discontinuous, normal condition, and following pattern 1,2 belongs to Traffic Anomaly, and it is normal but message is discontinuous that mode 3,4 belongs to flow, and pattern 5 belongs to normal condition:
1) stNum(event sequence number) variation is too fast, and perhaps sqNum(sends sequence number) increase in the mode that surpasses normal frequency, the information flow-rate that causes equipment to send is excessive; Sample count increases in the mode that surpasses normal frequency, and the information flow-rate that causes equipment to send is excessive; Flow is higher than the threshold value of normal discharge, and this state is called the information inflow-rate of water turbine,
2) sqNum(sends sequence number) increase and count continuously in the mode that is lower than normal frequency, or do not increase, cause information flow-rate excessively low; Sample count increases in the mode that is lower than normal frequency and counts continuously, or does not increase, and causes information flow-rate excessively low; Flow is lower than the threshold value of normal discharge, and this state is called the information low discharge.For example, to the SV message: transmission frequency sends according to different sample rates, whenever send a SV message to have corresponding counting operation, and the scope of counting is relevant with sample rate, and sample count increases progressively from 0 to sample frequency, makes zero in every whole second; At every cycle 80 points of sampling, under the 50HZ frequency: sample count is at 0-〉3999 increase progressively; Sample count was 0 in every whole second, 4000 SV messages of per second transmission, and these all are normal frequencies.The threshold value of normal discharge refers to: have transformer substation case GOOSE to produce, and the transformer substation case GOOSE message of all contingent trip signals, control signal and status information of equipment at synchronization with cycle T
NSend together, the SV message still sends with the fixed cycle, and the maximum when this moment, information flow-rate was the normal steady operation of process-level network multiply by the threshold value that the nargin coefficient is normal discharge.
In this example, the information inflow-rate of water turbine is taked the protection of syllogic inflow-rate of water turbine, as shown in Figure 6:
When information flow F bore the maximum stream flow limit greater than network, network had reached and can bear flow to greatest extent, must be in time with the faulty equipment excision, so introduce inflow-rate of water turbine I segment protect.
When reaching network, F do not bear the maximum stream flow limit; but because the total flow that the generation abnormal flows such as network equipment failure demonstrate network is between maximum stream flow and the regime flow; also should provide corresponding protection this moment; fault is excised as early as possible in order to avoid cause the worse situation such as network storm, so introduce inflow-rate of water turbine II segment protect.
The III segment protect is not given unnecessary details herein.
That is to say that the nargin coefficient determines that according to the maximum stream flow limit that network can bear K2, K3 select according to actual conditions according to K1.
3) stNum(event sequence number) or sqNum(send sequence number) occur to jump change, information flow is discontinuous, it is discontinuous that this state is called GOOSE stream;
4) variation of jumping appears in sample count, and information flow is discontinuous, and it is discontinuous that this state is called SV stream;
5) stNum(event sequence number), sqNum(sends sequence number) and sample count normally increase progressively, information flow is normal.
Control module is responsible for controlling accordingly and/or alarm operation according to different patterns with alarm module:
For pattern 1), normally certain is unusual because some IED equipment occurs for the excessive reason of information flow state, its continual high flow send information to network, if continuing again, this situation probably can cause whole periods of network disruption and paralysis, cause a lot of important informations of other equipment correctly to send, at this time just need to adopt the inflow-rate of water turbine protection, the equipment that will send abnormal flow (inflow-rate of water turbine) temporarily cuts away from network, the excision here has two kinds of implications, a kind of can not be as circuit breaker physically with equipment and Network Isolation, but utilize in logic Spanning-Tree Protocol to disconnect this paths or the mode of attacking by imitation ARP so that the message of equipment can't send to network gets on; Another kind is that starting relay cuts off device power supply (DPS), thereby plays automatically, rapidly, selectively fault element is excised from network, guarantees that other fault-free parts recover rapidly normal operation, as shown in Figure 3.
Inflow-rate of water turbine protection inquiry GOOSE controll block path judges that unusual high flow capacity is which logical device by which IED causes, thus the port flow that cuts off this logical device;
For pattern 2); that another kind of fault for the network equipment arranges; when certain IED equipment or the link that connects this IED equipment have had certain fault; its heartbeat message has stopped; perhaps heartbeat is slower than set numerical value; or surpass life span and do not receive message, just should start the low discharge protection this time.Switch sends a simple request message to IED equipment, if within official hour, do not receive the response message, can judge that then fault has occured for this link or this IED equipment, and give a warning, the notice O﹠M personnel overhaul this circuit and equipment, as shown in Figure 4.
In order to improve the reliability of network; tend to adopt redundant structure to provide a more than path for the communication of a certain equipment; then select wherein one to transmit by Spanning-Tree Protocol; thus if fault has appearred in link; the low discharge protection is not only worked at original path and redundant via, perhaps just can move in the situation of Spanning-Tree Protocol startup redundant via failure.Therefore the situation of low discharge protection action often all is that problem has appearred in IED equipment.Low discharge protection is based on GOOSE controll block path and SV sampled value ID and judges which equipment what low discharge occured is, and control with alarm to it.
For mode 3) when discontinuous situation occured the GOOSE message, control system only needed the mode of this state by alarm sent to the operations staff, and different alarm signals consists of the outlet data collection.
For pattern 4), if discontinuous situation occurs in the information flow of SV message, then control system need be passed through Lagrange interpolation formula, according to sampled value information before the sampled value information that the message that lacks carries is estimated, in order to drop to the impact of the discontinuous generation of message minimum.
Above-described embodiment is the better execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1. information flow control system that improves the intelligent substation reliability of relay protection is characterized in that: comprising:
The message capturing module, characteristic quantity parsing module and the Fault Pattern Recognition module that connect with data wire successively, also external data library module, Fault Pattern Recognition module external characteristic quantity fixed value adjusting module and database module of characteristic quantity parsing module wherein, the Fault Pattern Recognition module is output control module and alarm module respectively;
Described message capturing module is used for the message on the capture network, and sends the message that captures to the characteristic quantity parsing module by interface; The characteristic quantity parsing module is used for resolving various messages on the network according to the information that database module provides, and obtains relevant message information as characteristic quantity, and the value of each characteristic quantity is deposited in the middle of the database module, calls analysis for the Fault Pattern Recognition module; The Fault Pattern Recognition module is used for the information by the analytical database module, and the fault mode of various messages is made evaluation and deposited pattern information in database module, and the identification of fault mode is leaned on is judgement to the feature value; Characteristic quantity fixed value adjusting module is used to pattern discrimination that foundation is provided, and control module determines the control strategy that needs are taked according to pattern information, perhaps by alarm module to operations staff's alarm.
2. the information flow control system of raising intelligent substation reliability of relay protection according to claim 1, it is characterized in that: one of following dual mode is adopted in the connection of described message capturing module: the one, be integrated in switch inside, and the message capturing module is connected with each port of switch; The 2nd, independently and with the mirror port of switch be connected, the message that switch receives other all of the ports copies a to mirror port.
3. the information flow control system of raising intelligent substation reliability of relay protection according to claim 2, it is characterized in that: described characteristic quantity parsing module: comprise type of message differentiation submodule, GOOSE correlated characteristic amount analyzing sub-module and sampled value correlated characteristic amount parsing module, type of message is differentiated the output that submodule receives the message capturing module, exports to respectively afterwards GOOSE correlated characteristic amount analyzing sub-module and sampled value correlated characteristic amount parsing module; The characteristic quantity parsing module is used for the value that GOOSE message that process-level network is transmitted and SV message resolve to obtain characteristic quantity.
4. the information flow control system of raising intelligent substation reliability of relay protection according to claim 3 is characterized in that: described Fault Pattern Recognition module: comprise that the Traffic Anomaly that connects successively judges submodule and event sequence number, sends sequence number and the sampled value counting is differentiated submodule; Traffic Anomaly is judged the external characteristic quantity fixed value adjusting of submodule module; Traffic Anomaly judges that the input of submodule connects the output of GOOSE correlated characteristic amount analyzing sub-module and sampled value correlated characteristic amount parsing module; The event sequence number, send sequence number and output that sampled value counting is differentiated submodule then respectively link control module and alarm module.
5. the information flow control method of the raising intelligent substation reliability of relay protection of each described control system in an employing such as the claim 1 to 4 may further comprise the steps:
The message capturing module message switching function that the S1 control system relies on switch receives GOOSE message and SV message;
The S2 control system is according to the analytic method that records in the database module, the characteristic quantity parsing module is resolved the entrained APPID of these two kinds of messages, packet counting information and the controll block information quoted, the final characteristic quantity information table that forms deposits in the database module;
The Fault Pattern Recognition module of S3 control system is at first by judging whether flow judges whether the situation of Traffic Anomaly within the threshold value of adjusting, if occuring, Traffic Anomaly then further judges inflow-rate of water turbine or low discharge by content, if inflow-rate of water turbine state, then carry out the inflow-rate of water turbine protection, the protection EO after, with report the test to the operations staff; If the low discharge protection is then carried out in low discharge protection, behind the protection EO, with report the test to the operations staff;
If the S4 flow is normal, judge then whether message discontinuous situation occurs, if find that message is discontinuous, then further judging discontinuous is GOOSE message or SV message, if the GOOSE message, then to operations staff's alarm, if the words of SV message, then by Lagrange interpolation formula, the sampled value information that the message that lacks carries is estimated then alarm according to sampled value information before;
If the S5 message is continuous, then finish this control operation circulation, begin next control operation circulation.
6. the information flow control method of raising intelligent substation reliability of relay protection according to claim 5, it is characterized in that: entrained APPID and the packet counting information of two kinds of messages described in the step S2 refers to, GOOSE message and SV message all contain APPID, the APPID of GOOSE message at 0x0 between the 0x3FFF, identified uniquely one road GOOSE, the APPID of SV message between the 0x7FFF, has identified one road adopted value at 0x4000 uniquely, and APPID is the major key that forms information table;
Described characteristic quantity parsing module is resolved and is comprised following content:
To the GOOSE message: adopt retransmission mechanism to send by IEC 61850 regulations, in two kinds of situation:
⑴ in situation about occuring without transformer substation case, and the GOOSE message is retransmitted the GOOSE message with the unit constant time interval, and the content of each bar message is identical, and the sqNum attribute that sends sequence number that different is in the message progressively increases progressively along with each repeating transmission message;
⑵ constantly send GOOSE message after article one is upgraded at T1 after having new transformer substation case to occur, in the message except corresponding state information changes, event sequence number stNum attribute increases by 1, the sqNum zero clearing New count of laying equal stress on, and then message is with interval tS=2N * S (N=0,1,2 ..., S=1ms) repeating transmission has identical information but the different GOOSE message of sequence count, i.e. T1=1ms, T2=2ms, T3=4ms ..., until the interval stabilizes to T0=500ms;
Resolve the controll block path of GOOSE message and the sampled value ID of SV message:
GOOSE controll block path is the full name path that begins from LD, is the unique pathname of GoCB in the LLN0 action scope, has indicated the logical device that sends this GOOSE message; Sampled value ID is the unique identification of sampled value buffering area, refreshes relevantly with sampled value, has indicated the logical device that sends this SV message.
7. the information flow control method of raising intelligent substation reliability of relay protection according to claim 6, it is characterized in that: among the described step S3, the Fault Identification of Fault Pattern Recognition module comprises following content:
Analysis result by the characteristic quantity parsing module is constantly differentiated following 5 kinds of patterns in conjunction with the normal discharge threshold value of adjusting in advance simultaneously, then state information is sent to control module if abnormal flow status occurs, carries out corresponding control operation by this module:
It is 3 large classes that Traffic-pattern is divided into, and Traffic Anomaly, flow are normal but message is discontinuous, normal condition, and following pattern 1,2 belongs to Traffic Anomaly, and it is normal but message is discontinuous that mode 3,4 belongs to flow, and pattern 5 belongs to normal condition:
1) event sequence number stNum variation is too fast, and the sqNum that perhaps sends sequence number increases in the mode that surpasses normal frequency, and the information flow-rate that causes equipment to send is excessive; Sample count increases in the mode that surpasses normal frequency, and the information flow-rate that causes equipment to send is excessive; Flow is higher than the threshold value of normal discharge, and this state is called the information inflow-rate of water turbine,
2) sqNum that sends sequence number increases in the mode that is lower than normal frequency and counts continuously, or does not increase, and causes information flow-rate excessively low; Sample count increases in the mode that is lower than normal frequency and counts continuously, or does not increase, and causes information flow-rate excessively low; Flow is lower than the threshold value of normal discharge, and this state is called the information low discharge;
3) variation of jumping appears in event sequence number stNum or the sqNum that sends sequence number, and information flow is discontinuous, and it is discontinuous that this state is called GOOSE stream;
4) variation of jumping appears in sample count, and information flow is discontinuous, and it is discontinuous that this state is called SV stream;
5) stNum, sqNum and sample count normally increase progressively, and information flow is normal.
8. the information flow control method of raising intelligent substation reliability of relay protection according to claim 7, it is characterized in that: described protection operation is responsible for controlling accordingly and/or alarm operation according to different patterns by control module and alarm module with alarm:
For pattern 1), the equipment that sends abnormal flow is temporarily cut away from network, the excision here is one of in the following way: 1. a kind of can not be as circuit breaker physically with equipment and Network Isolation, but utilize in logic Spanning-Tree Protocol to disconnect this paths or the mode of attacking by imitation ARP so that the message of equipment can't send to network gets on; 2. another kind is that starting relay cuts off device power supply (DPS), thereby plays automatically, rapidly, selectively fault element is excised from network, guarantees that other fault-free parts recover rapidly normal operation; Inflow-rate of water turbine protection inquiry GOOSE controll block path judges that unusual high flow capacity is which logical device by which IED causes, thus the port flow that cuts off this logical device;
For pattern 2), switch sends a simple request message to IED equipment, if within official hour, do not receive the response message, can judge that then fault has occured for this link or this IED equipment, and give a warning, the notice O﹠M personnel overhaul this circuit and equipment;
For mode 3), the mode of this state by alarm sent to the operations staff, different alarm signals consists of the outlet data collection;
For pattern 4), if discontinuous situation occurs in the information flow of SV message, then control system need be passed through Lagrange interpolation formula, according to sampled value information before the sampled value information that the message that lacks carries is estimated, in order to drop to the impact of the discontinuous generation of message minimum.
9. the information flow control method of raising intelligent substation reliability of relay protection according to claim 7 is characterized in that: the normal frequency during the described sqNum of sending sequence number increases in the mode that surpasses normal frequency refers to: 4000 SV messages of per second transmission; Normal frequency during sample count increases in the mode that surpasses normal frequency refers to: at every cycle 80 points of sampling; The threshold value of normal discharge refers to: have transformer substation case GOOSE to produce, and the transformer substation case GOOSE message of all contingent trip signals, control signal and status information of equipment sends with cycle T N together at synchronization, the SV message still sends with the fixed cycle, maximum when this moment, information flow-rate was the normal steady operation of process-level network multiply by the threshold value that the nargin coefficient is normal discharge.
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