CN104537238A - Networked relay protection reliability evaluating system - Google Patents
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Abstract
The invention provides a networked relay protection reliability evaluating system which comprises an information input unit and a reliability calculating unit. The information input unit inputs data information required by the system, the reliability calculating unit receives the data information and then analyzes a message transmission path in a network and analyzes and calculates the delay rate, packet loss probability, error rate and physical device communication rate of the communication network to obtain networked relay protection reliability by means of a state-space method. The networked relay protection reliability evaluating system has the following advantages of being comprehensive in reliability analysis and high in networked relay protection reliability analysis accuracy degree.
Description
Technical Field
The invention relates to the field of reliability evaluation, in particular to a networked relay protection reliability evaluation system.
Background
The selectivity, the speed, the sensitivity and the reliability of a relay protection system of a power grid are often limited by the traditional protection principle and cannot be met simultaneously or cannot be better matched, and the four-characteristic implementation degree of the relay protection system often reflects the strength of the function of the relay protection system. In order to make the relay protection system of the power grid better function and fully make the four functions of relay protection reach the most perfect functions, it is necessary to gradually perfect and use a network-based power grid relay protection technical scheme to comprehensively utilize the protection information of the whole grid to accurately and quickly remove faults. Compared with the traditional microcomputer protection, the networked protection has the following characteristics: the data acquisition unit is separated from the relay protection equipment, and the analog/digital conversion work is completed by the merging unit; the traditional cable forming the secondary loop is replaced by a process layer network, and information such as sampling values, tripping, locking, synchronization and the like is exchanged among all devices through the network; the traditional hard connection based on the cable among the devices is replaced by the virtual connection based on the message subscription relationship, and the virtual connection and the hard connection can express the interactive relationship of the information among the devices; the introduction of networks makes networked protection a typical distributed control system, and synchronization between sampling values plays an important role in the implementation of protection functions.
Therefore, the factors affecting the reliability of networked relay protection mainly include the following aspects: communication performance of the communication network, which includes packet loss rate, delay rate, and bit error rate; reliability of the secondary equipment; the equipment regular maintenance frequency, the repair rate and the like.
Therefore, the networked relay protection system faces new reliability influence factors, and therefore the reliability evaluation method of the networked relay protection system is necessary to be perfected on the basis of the traditional relay protection reliability evaluation system. In order to analyze the reliability of a networked relay protection system, researchers propose a reliability analysis method based on information flow, and analyze the reliability of a virtual link by analyzing a circulation path of a process layer network message of the relay protection system and a reliability analysis method of a serial-parallel system. The prior art has the problem that the reliability analysis part of the secondary circuit of the networked relay protection is not comprehensive enough, so that the accuracy of the reliability analysis of the networked relay protection is not high. The method is characterized in that firstly, the problem of accurate analysis of the process layer network performance in a secondary circuit exists, and secondly, the problem of incomplete factor analysis influencing the reliability of networked relay protection exists, because the reliability analysis of a virtual link only influences one part of the reliability analysis of the networked relay protection. The key point for solving the problems is to establish a secondary loop model which is specific to networked protection and based on a process layer network, and is used for analyzing the reliability of virtual connection between equipment and calculating the network performance of the process layer network.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a networked relay protection reliability evaluation system with more comprehensive reliability analysis and higher accuracy of reliability analysis of networked relay protection, aiming at the defects that the reliability analysis in the prior art is not comprehensive enough and the accuracy of reliability analysis of networked relay protection is not high.
The technical scheme adopted by the invention for solving the technical problems is as follows: the reliability evaluation system for the networked relay protection is constructed and comprises an information input unit and a reliability calculation unit, wherein the information input unit inputs data information required by the system, the reliability calculation unit receives the data information, analyzes and calculates the delay rate, the packet loss rate, the error rate and the physical equipment communication rate of the communication network by analyzing the transmission path of a message in the communication network, and obtains the reliability of the networked relay protection according to a state space method.
In the networked relay protection reliability evaluation system, the information input unit comprises an information source information input module, a network topology information input module and a VLAN configuration information input module, the information source information input module is connected with the reliability calculation unit and is responsible for collecting protection data messages of a process layer network and corresponding source port numbers thereof and creating a mapping model of the messages and the information source ports, the network topology information input module is connected with the reliability calculation unit and is responsible for collecting network topology information of the process layer network, and the VLAN configuration information input module is connected with the reliability calculation unit and is responsible for collecting VLAN configuration information based on process layer network message subscription relation.
In the networked relay protection reliability evaluation system of the present invention, the reliability calculation unit includes a port connection relationship creation module, a message transmission path calculation module, an error code failure rate calculation module, a packet loss failure rate calculation module, a delay failure rate calculation module, a connectivity calculation module, and a state space method reliability calculation module, the port connection relationship creation module is respectively connected to the network topology information input module and the VLAN configuration information input module for respectively creating a physical connection relationship model and a logical connection relationship model of the device, the message transmission path calculation module is respectively connected to the information source information input module and the port connection relationship creation module for creating a message transmission path calculation algorithm, the error code failure rate calculation module is connected to the message transmission path calculation module for calculating the error code failure rate of the message, the packet loss and failure rate calculation module is connected with the message transmission path calculation module and used for calculating packet loss and failure rate of a message, the delay and failure rate calculation module is connected with the message transmission path calculation module and used for calculating delay and failure rate of the message, the connectivity calculation module is connected with the message transmission path calculation module and used for calculating connectivity of the message, and the state space method reliability calculation module is respectively connected with the error code and failure rate calculation module, the packet loss and failure rate calculation module, the delay and failure rate calculation module and the connectivity calculation module and used for calculating reliability of the networked relay protection system according to a state space method.
In the networked relay protection reliability evaluation system, the networked relay protection reliability evaluation system further comprises a maintenance object optimization module, and the maintenance object optimization module is connected with the state space method reliability calculation module and used for distinguishing the importance of the networked relay protection secondary equipment.
In the networked relay protection reliability evaluation system, the networked relay protection reliability evaluation system further comprises a maintenance period optimization module, wherein the maintenance period optimization module is connected with the state space method reliability calculation module and is used for establishing a curve with the maintenance period as an independent variable and the reliability as a dependent variable and calculating the maintenance period corresponding to the highest point on the curve.
In the networked relay protection reliability evaluation system, the message transmission path calculated by the message transmission path calculation module is the combination of the optical fiber physical link and the virtual link in the switch.
The networked relay protection reliability evaluation system has the advantages that the information input unit and the reliability calculation unit are used, the information input unit inputs data information required by the system, the reliability calculation unit analyzes and calculates the delay rate, the packet loss rate, the bit error rate and the physical equipment communication rate of the communication network after receiving the data information by analyzing the transmission path of the message in the communication network, and the reliability of networked relay protection is obtained according to a state space method, so that the analysis is comprehensive, and the accuracy of reliability analysis of the networked relay protection is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a networked relay protection reliability evaluation system according to the present invention;
FIG. 2 is a flow chart of message transmission path computation in the embodiment;
FIG. 3 is a schematic diagram of a virtual connection malfunction tree model in the embodiment;
FIG. 4 is a diagram of a virtual connection denial of service fault tree model in the above-described embodiment;
fig. 5 is a schematic diagram of a state space of the protection subfunction in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the networked relay protection reliability evaluation system, a schematic structural diagram of the networked relay protection reliability evaluation system is shown in fig. 1. In fig. 1, the networked relay protection reliability evaluation system includes an information input unit 1 and a reliability calculation unit 2, the information input unit 1 inputs data information required by the networked relay protection reliability evaluation system, and the reliability calculation unit 2 analyzes and calculates a delay rate, a packet loss rate, an error rate, and a physical device communication rate of the communication network by analyzing a transmission path of a message in the communication network after receiving the input data information, and obtains the reliability of the networked relay protection according to a state space method, wherein the analysis is comprehensive, and the reliability analysis accuracy of the networked relay protection is high.
In this embodiment, the information input unit 1 includes an information source information input module 11, a network topology information input module 12, and a VLAN configuration information input module 13, where the information source information input module 11 is connected to the reliability calculation unit 2, and is responsible for collecting the protection data packet of the process layer network and the source port number corresponding to the protection data packet, and creating a mapping model C of the packet and the information source port, that is:
wherein p is a positive integer, m is a positive integer,
j is a positive integer and i is a positive integer.
The network topology information input module 12 is connected to the reliability calculation unit 2, and is responsible for collecting network topology information of the process layer network, which reflects the physical connection relationship between process layer network devices. The VLAN configuration information input module 13 is connected to the reliability calculation unit 2, and is responsible for collecting VLAN configuration information based on a process layer network packet subscription relationship, which reflects a virtual connection relationship of ports of a process layer network switch.
In this embodiment, the reliability calculation unit 2 includes a port connection relationship creation module 21, a packet transmission path calculation module 22, an error code failure rate calculation module 23, a packet loss failure rate calculation module 24, a delay failure rate calculation module 25, a connectivity calculation module 26, and a state space method reliability calculation module 27, where the port connection relationship creation module 21, the packet transmission path calculation module 22, the error code failure rate calculation module 23, the packet loss failure rate calculation module 24, the delay failure rate calculation module 25, the connectivity calculation module 26, and the state space method reliability calculation module 27 are core modules of the networked relay protection reliability evaluation system. Wherein, the port connection relation creating module 21 is connected with the network topology information input module 12 and the VLAN configuration information input module 13 respectively, and is used for creating a physical connection relation model and a logical connection relation model of the device respectively, the packet transmission path calculating module 22 is connected with the information source information input module 11 and the port connection relation creating module 21 respectively, and is used for creating a packet transmission path calculating algorithm, the error code failure rate calculating module 23 is connected with the packet transmission path calculating module 22, and is used for calculating the error code failure rate of the packet, the packet loss rate calculating module 24 is connected with the packet transmission path calculating module 22, and is used for calculating the packet loss rate of the packet, the delayed failure rate calculating module 25 is connected with the packet transmission path calculating module 22, and is used for calculating the delayed failure rate of the packet, the connectivity calculating module 26 is connected with the packet transmission path calculating module 22, and, The state space method reliability calculation module 27 is connected to the error code failure rate calculation module 23, the packet loss failure rate calculation module 24, the delay failure rate calculation module 25 and the connectivity calculation module 26, and is configured to calculate the reliability of the networked relay protection system according to the state space method.
In this embodiment, specifically, the port connection relationship creating module 21 respectively creates a physical connection relationship model and a logical connection relationship model of the device according to the information collected by the network topology information input module 12 and the VLAN configuration information input module 13, as follows:
assuming that n devices in a process layer network of a distribution network have p ports (including ports of switches and ports of automatic equipment such as relay protection equipment), the network can be described by using an undirected graph G with the ports as nodes and optical fiber links as arcs, and a node adjacency matrix Pp × p of the graph G contains topology information of the physical network, as shown below:
wherein,
j is a positive integer and i is a positive integer.
In addition, in a distribution network networked relay protection process layer network, based on a VLAN configuration mode of a switch port, the port can be used as a node, a VLAN configuration relation is used as a branch, the network is described by using a directed graph F, and a node adjacency matrix Dp multiplied by p of the graph F contains topology information of the virtual network. As follows:
wherein,
j is a positive integer and i is a positive integer.
The message transmission path calculation module 22 creates a message transmission path calculation algorithm according to the mapping model C between the message and the source port created in the source information input module 11, and the physical connection relationship model P and the logical connection relationship model D created in the port connection relationship creation module 21, as follows:
firstly, a mapping model S of the message and the non-source port is defined,
wherein,
second, redefine the matrix multiplication Sik＝Pij*Cjk，
Because the matrix P represents the physical connection relationship between ports, and c(s) is the correspondence relationship between the packet and the ports, when P × c(s) is executed, it is equivalent to one step of packet transfer in the network along the physical medium (such as an optical fiber link); similarly, because the matrix D represents the logical connection relationship between the ports, when D × c(s) is executed, it is equivalent to that the packet is forwarded by the switch once. Therefore, the algorithms of P, C (S) and D, C (S) are executed in sequence, and the transfer process of the message in the network can be simulated by properly processing the data of the matrix S. The specific flow chart is shown in fig. 2. The message transmission path calculated by the message transmission path calculation module 22 is actually a combination of the optical fiber physical link and the virtual link in the switch, which corresponds to a secondary loop in which the conventional relay protection is only composed of the cable physical link. Therefore, the communication reliability of the secondary circuit of the networked relay protection can be obtained according to the calculated message transmission path.
In this embodiment, for the error and failure rate calculation module 23, since the network protection introduces a communication network such as a process layer network to replace the traditional point-to-point secondary connection, and the uploading of the electrical quantity information and the issuing of the protection control command are all transmitted through the network, the performance of the communication network greatly affects the reliability of the networked relay protection, and the performance of the communication network includes an error rate, a packet loss rate, a delay rate, and the like. The error code of the GOOSE message does not necessarily cause the protection failure, but if the error code of the GOOSE message happens to be at the position representing the trip information, the false action of the relay protection can be caused, and the false action can also be caused, and the probability of the two is equal. Different messages or the same message are transmitted in different transmission paths, and the error rates faced by the messages in the whole message transmission path are different. Therefore, the error rate of the message calculated based on the message transmission path has higher reliability.
Assuming that w physical devices are shared on a GOOSE message transmission path, the bit error rates of the physical devices are BER, and if the length of the GOOSE message is L and the packet sending frequency is F, the failure rate of the GOOSE message on the transmission path due to false operation or rejection caused by bit error is as follows:
in this embodiment, for the packet loss efficiency calculation module 24, when a packet is transmitted in the process layer network, packet loss mainly occurs in the switch. Switches and switch load rates of different messages or the same message on different message transmission paths are different, so that packet loss rates are different. The packet loss rate of a packet should be the sum of the packet loss rates of the switches it passes through on the entire transmission path.
The packet loss rate of the switch mainly has a negative exponential relationship with the load rate of the switch. The load of the switch in the networked protection system has certain certainty, which is mainly reflected in that under the condition that the network normally works, the load of the SV message and the PTP message is determined, and the load of the GOOSE message has a certain upper bound. Therefore, the maximum number of messages passing through a certain switch, namely the upper load bound, can be calculated according to each message transmission path, and the packet loss rate of the switch is further determined. For the case that the network has faults such as broadcast storm, congestion and the like, the packet loss is extremely serious, so that the packet loss is classified as caused by virtual connection disconnection.
Different messages are given different priorities due to different importance degrees, and if the SV message and the GOOSE message share p paths, the priorities are y1The PTP message has q paths, and the priority is y2Then the method of weighting can be used to approximateAnd calculating the packet loss rates of different messages. If the packet loss of n frames of SV message i can cause the refusal action or the false action of the relay protection, the packet loss efficiency lambda of the SV message is determinedSLSThe calculation can be approximated using:
in the formula IiIs the load flow of SV message, LkAs a messageAnd (3) the total load of the K-th switch is passed through, K is a constant coefficient, and m represents that the physical links mapped by the virtual connection of the SV message i share m switches. Lambda [ alpha ]PLSAnd λGLSA similar method can be used for the calculation. The failure rates of false action or refusal action caused by SV message packet loss and PTP message packet loss are 1/2 lambda respectivelySLSAnd 1/2 λPLS。
For the delay failure rate calculating module 25, the residence time of the message in the switch occupies most of the total delay of message transmission, and the other delays occupy less and relatively fixed share of the total delay, so the residence delay of the message in the switch is mainly considered in the transmission delay of the message from the initial port to the final port. Because the queuing delay of the switch is closely related to the real-time load of the switch, the queuing delay of the message at the switch has fluctuation. If all q GOOSE messages pass through a certain switch in the process of transmitting to the destination port, under the condition that the network works normally, the maximum possible load (the longest queuing delay) of the switch is generated under the condition that all the q GOOSE messages are in a burst state (the network delay caused under the condition of network broadcast storm is not considered), and the method is a large form of a process layer network. If the transmission delay of a certain message does not exceed the specified range in a large format, the failure rate of the message due to excessive delay can be considered to be 0. If the delay of a certain message exceeds the specified range in a large mode, the excessive failure rate of the message delay is related to the burst probability of the GOOSE message. Considering that the queuing delay is basically in direct proportion to the load, the burst probability of each GOOSE message is assumed to be lambdapriIf the queue delay of d units is increased after the occurrence of the SV packet, the packet delay is too large and the failure rate is lambdaSDEComprises the following steps:
wherein, T represents the maximum transmission delay of the specified SV packet, E represents a relatively fixed part on the physical link mapped by the SV packet virtual connection except for queuing delay, and m is the number of switches on the link. Lambda [ alpha ]GDE(excessive delay and failure rate of GOOSE message) and lambdaPDEThe calculation method (too large delay and failure rate of PTP message) is similar to the above method.
For the connectivity calculation module 26, the process layer packet may pass through a plurality of physical devices during transmission from the start port to the destination port, for example, the SV packet may pass through the merging unit MU, the optical fiber, the switch, the relay protection device, and other physical devices during transmission from the MU port to the protection IED port, so that the connectivity of the SV packet is related to the reliability of the physical devices, and may be directly obtained according to the serial-parallel relationship between the physical devices.
For the state space method reliability calculation module 27, in a networked relay protection process layer network (virtual connection), factors that may cause protection failure mainly include the following four aspects: (1) trip GOOSE message error code (GBER); (2) packet Loss (LS) which is divided into GOOSE packet loss (GLS), SV packet loss (SLS) and PTP Packet Loss (PLS); (3) virtual connection broken Line (LB) comprising virtual connection broken line (GLB) corresponding to GOOSE message, SV message connection broken line (SLB) and PTP message connection broken line (PLB); (4) the transmission delay of the message in the network exceeds a specified range (DE), and can be specifically classified into too large delay of GOOSE message (GDE), too large delay of sv (sde) message and too large delay of PTP (PDE). According to the relationship between the relay protection misoperation and refusal and the factors, a fault tree model with the misoperation and refusal factors in virtual connection can be constructed, as shown in fig. 3 and 4. FIG. 3 is a schematic diagram of a virtual connection malfunction tree model in this embodiment; fig. 4 is a schematic diagram of a virtual connection denial of service fault tree model in this embodiment.
If a certain protection subfunction relates to f GOOSE virtual connections, g SV virtual connections and h time synchronization virtual connections, then the virtual connection malfunction failure rate and the malfunction failure rate of the protection subfunction can be known to be respectively:
in a networked relay protection system, in addition to failure of the virtual connection causing failure of the protection system, failure of the protection device hardware and software also causes failure of the protection system. In addition, the periodic maintenance frequency and the repair rate of the secondary equipment also influence the reliability of the relay protection to a certain extent. Therefore, the reliability of the networked relay protection system is calculated according to the state space method by combining the factors. The method comprises the following specific steps:
first, the following assumptions are made: one part of hardware failure can be detected and repaired through the self-checking function of the networked protection system, and the other part of failure which can not be detected through the self-checking can be detected and repaired in the regular maintenance; the failure of one part of virtual connection can be detected and repaired through the self-checking function of the networked protection system, and the failure of the other part of virtual connection which cannot be detected through the self-checking function can be detected and repaired in the regular maintenance; software failure cannot be detected through the self-checking function of the networked protection system, and can only be detected and repaired in regular maintenance. Then, based on the above assumptions, a state space diagram as shown in fig. 5 can be used to describe the transition relationship between the states of a certain networked protection sub-function.
In fig. 5, UP is a normal state, HD is a protection exit (overhaul) state caused by hardware, HMJ is a hardware operation rejection state capable of self-checking, HUJ is a hardware operation rejection state incapable of self-checking, HMW is a hardware operation rejection state capable of self-checking, HUW is a hardware operation rejection state incapable of self-checking, SD is a protection exit (overhaul) state caused by software, SJ is a software operation rejection state, SW is a software operation rejection state, CD is a protection exit (overhaul) state caused by virtual wire, CMJ is a virtual connection operation rejection state capable of self-checking, CUJ is a virtual connection operation rejection state incapable of self-checkingAnd the active state, CMW is a self-detectable virtual connection misoperation state, CUW is an undetectable virtual connection misoperation state, and JD is a protection exit state caused by regular maintenance. The failure repair rates of hardware, software and virtual connection are respectively F1、F2And F3The failure self-checking rates of hardware and virtual connection are respectively W1And W2The maintenance frequency is lambdajx。
The state transition matrix Q of the protection subfunction is built up according to FIG. 5, the element Q of whichijRepresenting the transition probability from state i to state j. The probability of each state can be calculated according to the following formula:
wherein, P ═ { P ═ P1,p2,…,pN}，Pi(i＝1～N)Representing the probability of being stable in the i state, and N is the total number of states. And the availability of the protection sub-function is numerically equal to PUPI.e. the stability probability in UP (normal state).
In this embodiment, the networked relay protection reliability evaluation system further includes a maintenance object optimization module 3, and the maintenance object optimization module 3 is connected to the state space method reliability calculation module 27 and is used for identifying the importance of the networked relay protection secondary device. Specifically, the reliability of each secondary device directly affects the reliability of networked relay protection, and the availability of each secondary device is the networked relay protectionThe independent variable of the protection availability is analyzed and compared with the networked relay protection availability PUPNumber of times (P) of each secondary device availability in the expressionUPThe highest degree of the secondary device availability in all the monomials of the expression is the degree of the secondary device availability), the more the degree is, the higher the secondary device importance is. The overhaul object optimization module 3 is used for distinguishing the importance of networked relay protection secondary equipment, so that technical support is provided for equipment type selection and economic investment.
In this embodiment, the networked relay protection reliability evaluation system further includes a maintenance period optimization module 4, where the maintenance period optimization module 4 is connected to the state space method reliability calculation module 27, and is configured to establish a curve with the maintenance period as an independent variable and the reliability as a dependent variable, and calculate a maintenance period corresponding to a highest point on the curve. Specifically, the overhaul period optimization module 4 is the stability probability P obtained by the reliability calculation module 27 according to the state space methodUPWherein the frequency lambda is periodically overhauledjxIs PUPThe independent variable of the system is established by taking the maintenance period as the independent variable and the reliability as the dependent variable, and the curve has a highest point which is the highest reliability point. By calculating the partial differential, the maintenance period corresponding to the highest point can be calculated. Therefore, the overhaul period optimization module 4 shows the influence of the setting of the overhaul period on the reliability of the networked relay protection, and provides technical guidance for the optimization problem of the overhaul period.
In summary, in this embodiment, a networked relay protection reliability evaluation system is provided, where a delay rate, a packet loss rate, an error rate, and a physical device communication rate of a communication network are analyzed and calculated by analyzing a transmission path of a message in the communication network, and finally, reliability of networked relay protection is obtained according to a state space method. The networked relay protection reliability evaluation system provided by the invention starts from the microscopic level of message transmission in the communication network, and fully considers the influence of the communication network performance and the connectivity of physical equipment on the network relay protection reliability, so that the obtained reliability evaluation result has higher precision.
The networked relay protection reliability evaluation system provided by the invention starts from the microscopic level of message transmission in a process layer network, is suitable for the characteristics of the networked relay protection system, and is very suitable for the reliability analysis of the networked relay protection. Meanwhile, the packet loss rate, the bit error rate and the delay rate of the process layer network and the communication rate of the relay protection secondary circuit (virtual circuit) are calculated according to the message transmission path, so that the calculation results of the packet loss rate and the like have higher reliability. In addition, the invention also extends to a fault tree method and a state space method in the traditional protection reliability evaluation mode, and expresses the characteristics of networked protection in a new form, and factors influencing the reliability of the networked relay protection are comprehensively considered, so that the network relay protection reliability evaluation system provided by the invention has higher reliability. Of course, the method plays a considerable role in the continuous improvement and expansion of networked relay protection.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The networked relay protection reliability evaluation system is characterized by comprising an information input unit and a reliability calculation unit, wherein the information input unit inputs data information required by the system, the reliability calculation unit receives the data information, analyzes and calculates the delay rate, the packet loss rate, the bit error rate and the physical equipment communication rate of the communication network by analyzing the transmission path of a message in the communication network, and obtains the reliability of networked relay protection according to a state space method.
2. The networked relay protection reliability evaluation system of claim 1, wherein the information input unit comprises an information source information input module, a network topology information input module, and a VLAN configuration information input module, the information source information input module is connected to the reliability calculation unit, and is responsible for collecting the protection data packets of the process level network and their corresponding source port numbers, and creating a mapping model of the packets and the information source port, the network topology information input module is connected to the reliability calculation unit, and is responsible for collecting the network topology information of the process level network, and the VLAN configuration information input module is connected to the reliability calculation unit, and is responsible for collecting the VLAN configuration information based on the subscription relationship of the process level network packets.
3. The networked relay protection reliability evaluation system according to claim 2, wherein the reliability calculation unit includes a port connection relationship creation module, a packet transmission path calculation module, an error code failure rate calculation module, a packet loss failure rate calculation module, a delay failure rate calculation module, a connectivity calculation module, and a state space method reliability calculation module, the port connection relationship creation module is respectively connected to the network topology information input module and the VLAN configuration information input module for respectively creating a physical connection relationship model and a logical connection relationship model of the device, the packet transmission path calculation module is respectively connected to the information source information input module and the port connection relationship creation module for creating a packet transmission path calculation algorithm, the error code failure rate calculation module is connected to the packet transmission path calculation module, and the delay failure rate calculation module is connected to the packet transmission path calculation module, The system comprises a state space method reliability calculation module, a packet loss efficiency calculation module, a message transmission path calculation module, a communication calculation module and a state space method reliability calculation module, wherein the state space method reliability calculation module is respectively connected with the error efficiency calculation module, the packet loss efficiency calculation module and the communication calculation module and is used for calculating the reliability of a networked relay protection system according to a state space method.
4. The networked relay protection reliability evaluation system according to claim 3, further comprising a maintenance object optimization module, wherein the maintenance object optimization module is connected to the state space method reliability calculation module and is used for identifying the importance of the networked relay protection secondary device.
5. The networked relay protection reliability evaluation system according to claim 4, further comprising an overhaul period optimization module, wherein the overhaul period optimization module is connected to the state space method reliability calculation module and is configured to establish a curve with an overhaul period as an independent variable and reliability as a dependent variable, and calculate an overhaul period corresponding to a highest point on the curve.
6. The networked relay protection reliability evaluation system according to claim 5, wherein the message transmission path calculated by the message transmission path calculation module is a combination of an optical fiber physical link and a virtual link in the switch.
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| CN105141473A (en) * | 2015-08-10 | 2015-12-09 | 机械工业仪器仪表综合技术经济研究所 | Method and system for evaluating communication reliability of online analytical instrument |
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| CN108446449A (en) * | 2018-02-22 | 2018-08-24 | 国电南瑞科技股份有限公司 | A kind of method of Quadratic Imaginary circuit automatic connection |
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| CN104537238B (en) | 2017-10-10 |
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