CN104680020B - Relay protection system reliability online evaluation system based on SCD - Google Patents

Abstract

A kind of field of power is based on the relay protection On-line Reliability Estimation system of SCD, including：Network communication module, human-machine interface module, model analyzing module, data processing module, reliability evaluation module, the present invention obtain protection system composition proposal and primary element and are converted to RBD by parsing SCD file；Intermediate data of SV, GOOSE, MMS Message processing of protection system operation conditions into needed for Calculation of Reliability will be reflected; based on Reliability Analysis Theory, RBD and reliability algorithm; complete to be analyzed for the static and On-line Reliability Estimation of various protection systems; the present invention realizes the static state and On-line Reliability Estimation of intelligent substation protection system; the hidden danger of relay protection system can effectively be found; it is that the state estimation based on fail-safe analysis lays the foundation; the availability of relay protection system is improved, for the safe operation of power network provides reliable guarantee.

Description

On-line Evaluation System for Reliability of Relay Protection System Based on SCD

technical field

The invention relates to a relay protection reliability evaluation technology in the technical field of power systems, in particular to an SCD-based relay protection system reliability online evaluation system.

Background technique

The main components of microcomputer protection are electronic components, but for a long time, the reliability evaluation of microcomputer protection has only stayed at the stage of theoretical analysis, and has not entered the field of practical engineering applications. The composition of the intelligent substation protection system based on the IEC61850 standard is far more complicated than that of the conventional comprehensive system. For example, physical devices such as merging units, intelligent terminals, and process layer switches have been added, and the protection has appeared "direct mining and direct jumping", "direct mining and network jumping", " Different application modes of network mining and network jumping. At the same time, it is possible to obtain the information of the protection system online through SV, GOOSE, and MMS networks. Therefore, under the background of smart substation technology, the reliability online evaluation of relay protection system is necessary and feasible.

After searching the existing technology, it was found that the Chinese Patent Document No. CN102136113A was published (announced) on 2011.07.27, which discloses a reliability evaluation scheme for the secondary system of an intelligent substation, which is established by using the reliability block diagram, adjacency matrix and minimum road set technology. The reliability evaluation model of the secondary system of the smart substation; on the basis of the device reliability estimation, the overall reliability of the system is calculated and the component importance analysis is introduced into the secondary system, and the secondary system of the smart substation is implemented using the probability importance and key importance. The importance of sub-system components is evaluated; according to the reliability evaluation results, the weak links that affect the reliability of the system are analyzed, and the measures of system structure optimization and equipment redundancy are adopted to improve the reliability of the system, which fully meets the new needs of smart substations. This technical method is suitable for the reliability assessment of the secondary system of the smart substation in the power system. However, this technology expounds the general reliability analysis technical scheme, and does not conduct targeted reliability analysis based on the substation protection system structure and configuration relationship covered by SCD, and does not reflect the different protection composition methods reflected by SCD (such as direct There are differences in the reliability analysis of direct mining, direct mining network jumping, and network mining network jumping), and online reliability evaluation based on real-time message information has not been realized.

Chinese Patent Document No. CN103559287A Publication (Announcement) Date 2014.02.05 discloses an automatic reliability analysis method for intelligent substation protection system based on SCD file, including the following steps: 1) Read the SCD file to obtain the information of each IED in the protection system The predicate expressions of virtual terminals and virtual circuits; 2) according to the predicate expressions, generate the logical connection diagram and the predicate expressions of the protection system; 3) perform predicate calculation according to the predicate expressions of the logical connection diagram, and identify the protection system 4) Transform the physical connection diagram into a reliability block diagram of the protection system; 5) Calculate the reliability index of the protection system according to the reliability block diagram. However, this technology only realizes static reliability evaluation, and does not solve the problem of online reliability evaluation; secondly, it does not propose an interval-based protection system reliability evaluation scheme; thirdly, it does not involve the information processing mechanism to reflect the protection operation status.

Contents of the invention

The present invention aims at the above-mentioned deficiencies existing in the prior art, and proposes a kind of SCD-based relay protection system reliability online evaluation system, by analyzing the SCD file, obtains the protection system configuration scheme of each interval (such as "direct acquisition direct jump", " direct mining network hop", "network mining network hopping", single configuration, dual configuration, etc.) Basic components; and convert the protection system configuration scheme into RBD (Reliability Block Diagram, reliability block diagram) based on the connection relationship of physical equipment functions. On this basis, the original messages of SV, GOOSE, and MMS that reflect the operating status of the protection system are processed into intermediate data required for reliability calculation; based on the reliability analysis theory and algorithm, various protections are carried out for the RBD of the protection system Static reliability evaluation and analysis of the system; through the processing of online acquisition of message information, the intermediate data required for reliability evaluation is formed to complete the online reliability evaluation and analysis.

The present invention is achieved through the following technical solutions:

The present invention includes: a network communication module, a man-machine interface module, a model analysis module, a data processing module, and a reliability evaluation module, wherein: the man-machine interface module outputs the received SCD file to the model analysis module and receives information from the model analysis module. Analyze the basic components, the human-machine interface module conducts reliability modeling on the basic components based on the reliability analysis theory and the human-computer interaction method, and sends the reliability model of the basic components to the reliability evaluation module; the model analysis module Analyze the SCD file of the protection system to obtain the configuration plan of the protection system, convert it into the RBD of the protection system, and output it to the reliability evaluation module; the network communication module collects the original message information reflecting the operating status of the protection system through the SV, GOOSE, and MMS networks and outputs it To the data processing module, the data processing module processes the SV, GOOSE, and MMS messages in the original message information into the intermediate data required for reliability simulation analysis, and outputs them to the reliability evaluation module; the reliability evaluation module is based on reliability analysis Theory and reliability simulation algorithm, the static reliability analysis and online reliability evaluation analysis of the protection system are performed on the reliability model of the basic components, the RBD of the protection system, and the intermediate data, and the evaluation results are sent to the data processing module for storage.

The basic elements used for modeling refer to the physical equipment (including connections) that constitute the protection system. The reliability of the protection system depends on the reliability combination of the basic elements.

The reliability model refers to: which characteristics the failure and repair rate of the components obey, such as corresponding to components without electronic components, such as connecting optical cables, a fixed parameter model can be used; components with electronic components use index distribution or a two-parameter Weibull distribution model.

The protection system reliability block diagram RBD refers to: use the structure-oriented analysis method to describe the physical connection and functional logic relationship diagram of each unit in the protection system, and construct the working principle diagram of the protection system with physical equipment as the object, such as "merging unit +connecting optical cable+protection device+connecting optical cable+process layer switch+connecting optical cable+intelligent terminal", constituting a protection system, etc.

The protection system includes: a merging unit located at the substation side for collecting analog information of transformers, a protection device, an intelligent terminal device connecting a circuit breaker and an isolating switch, and related secondary connection circuits.

The original message information includes: real-time SV, GOOSE and MMS messages, such as reflecting protection system operating conditions, such as protection system commissioning, maintenance, etc.; protection system (including secondary circuit) health status, such as message interruption, Device hardware abnormality alarm, software alarm, etc.

The basic components described include: independent physical form equipment that constitutes the logical functional relationship of the protection system, such as merging units (including merging smart terminals), protection devices, process layer switches, smart terminals, connecting optical cables, etc.:

The intermediate data refers to the data that can be directly used for reliability simulation calculation after the original message is processed according to the reliability simulation calculation requirements. For example, based on hazard and operability analysis (HAZOP, Hazard and operability), the reasons in Table 1 belong to the intermediate data, and the deviation belongs to the original data.

Table 1 HAZOP analysis of intelligent substation protection system

The configuration scheme of the protection system refers to: the protection system configured for the primary elements to be protected, such as single-layer, double-layer schemes and the composition of the protection configuration scheme, such as: 1) "direct acquisition and direct jump" scheme : That is, the "point-to-point" optical cable is directly connected between the protection device and the merging unit, and the SV message is directly collected; the "point-to-point" optical cable is directly connected between the protection device and the intelligent terminal, and the status information of the circuit breaker is obtained, and the tripping and closing command is output. ; 2) "Direct acquisition network jump" scheme: that is, the "point-to-point" optical cable is directly connected between the protection device and the merging unit to directly collect SV messages; the protection device and the intelligent terminal are connected through a switch to obtain circuit breaker status information, And output the trip and close command; 3) "Network mining and network jumping" scheme: that is, the protection device and the merging unit are connected through a switch to collect SV messages; the protection device and the intelligent terminal are connected through a switch to obtain the circuit breaker status information, and output tripping and closing commands, etc.

technical effect

Compared with the prior art, the present invention obtains the composition scheme of each protection system by analyzing the SCD file, constructs the reliability analysis model of the basic elements of the protection system, and converts the composition scheme of the protection system into RBD. Obtain the original message reflecting the operation status of the protection system online, and process it into the intermediate data required for reliability analysis; realize the static or online reliability of the intelligent substation protection system based on the reliability model, reliability block diagram and intermediate data of the basic components of the protection system The evaluation can effectively discover the hidden dangers of the relay protection system, lay the foundation for the state evaluation based on reliability analysis, improve the availability of the relay protection system, and provide reliable guarantee for the safe operation of the power grid.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is the schematic flow chart of embodiment 1.

detailed description

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

Example 1

As shown in Figure 1, the present embodiment includes: a network communication module, a man-machine interface module, a model analysis module, a data processing module, and a reliability evaluation module, wherein: the man-machine interface module outputs the received SCD file to the model analysis module And receive the basic components analyzed by the model analysis module, the man-machine interface module conducts reliability modeling on the basic components according to the reliability analysis theory and human-computer interaction mode, and sends the reliability model of the basic components to the reliability evaluation module ;The model analysis module analyzes the received SCD file to obtain the protection system configuration plan, converts it into the RBD of the protection system, and outputs it to the reliability evaluation module; the network communication module collects and reflects the operation status of the protection system through SV, GOOSE, and MMS networks The original message information is output to the data processing module. The data processing module processes the SV, GOOSE, and MMS messages in the original message information into intermediate data required for reliability simulation analysis based on the reliability simulation analysis for data requirements. , and output to the reliability evaluation module; the reliability evaluation module conducts static reliability analysis and online reliability analysis on the reliability model of the basic components, RBD of the protection system, and intermediate data of the protection system based on the reliability analysis theory and the reliability simulation algorithm. Evaluate and analyze, and send the evaluation results to the data processing module for storage. Thus, the reliability evaluation of the relay protection system based on SCD is completed.

The network communication module includes: a network communication unit and a data transmission unit, wherein: the network communication unit respectively receives the original system operation message from the protection system and the reliability evaluation data call request from the power grid; the data transmission unit sends the original message Send to the data processing module, and call the data of the data processing module according to the call request from the power grid.

The man-machine interface module includes: a data read-in unit, a man-machine operation unit and a visual display unit, wherein: the data read-in unit obtains the SCD file and outputs it to the model analysis module; the man-machine operation unit receives manual operation instructions, reads SCD files and reliability modeling of basic components; the visual display unit receives information from the data processing unit of the data processing module, and uses technologies such as QT to realize the visual display of reliability evaluation results.

The model analysis module includes: a model analysis unit, an RBD conversion unit, wherein: the model analysis unit analyzes the SCD file and obtains basic components (such as line protection, transformer protection, busbar protection, etc.) that constitute various protection systems merging unit, protection device, process layer switch, intelligent terminal, connecting optical cable, etc.), and transmit it to the man-machine interface module; the RBD conversion unit converts the configuration of the protection system into RBD based on physical connection and functional logic relationship, and outputs it to Reliability Evaluation Module.

The data processing module supports the calling of the data by the human-machine interface module, and the module includes: a data processing unit and a data storage unit, wherein: the data processing unit processes the original message into intermediate data, and receives the data from the human-machine interface module. Calling of the reliability evaluation results; the data storage unit saves the evaluation results and intermediate data from the reliability evaluation module.

The reliability evaluation module includes: a static evaluation unit and an online evaluation unit, wherein: the static evaluation unit receives the basic component reliability model from the man-machine interface module and the RBD of the model analysis module, and evaluates the protection system according to the reliability analysis algorithm Static reliability; online evaluation unit, combined with RBD, intermediate data and maintenance strategy, based on reliability analysis algorithm, realizes online reliability evaluation of the protection system.

Described reliability analysis algorithm refers to: be used to reflect the algorithm of various indexes of device or system reliability, as its expression of reliability R is: R (t)=e- ^λt ; Mean failure time Among them: λ is the failure rate of equipment or system, and the failure rate often changes with time, presenting the so-called "bathtub curve" shape, and the accurate description model is Weibull distribution: Among them: α is the shape parameter of Weibull distribution. When α = 1, its failure rate is constant, that is, becomes an exponential distribution, and so on.

Thus, the online evaluation of relay protection reliability based on SCD is completed.

As shown in Figure 2, the system works in the following ways:

S100: Obtain the SCD file through the man-machine interface interface, analyze and obtain the composition scheme of the protection system (line, transformer, busbar protection, etc.) etc.), and the basic components that constitute the protection system (such as merging units, protection devices, process layer switches, intelligent terminals, connecting optical cables, etc.).

S200: Complete the reliability modeling of the basic components of the protection system through the man-machine interface.

S300: Convert the protection system composition scheme obtained after analyzing the SCD into a protection system RBD, and use it as an input data source for reliability analysis.

S400: Obtain online the operation status message information (raw data) of the protection system, and process it into intermediate data required for reliability analysis according to the theory of reliability analysis.

S500: Based on the reliability model of the basic components of the protection system, RBD, and intermediate data, use reliability analysis theories and algorithms to conduct static reliability analysis based on the protection system RBD, or online reliability analysis based on operating status information;

Thus, the reliability evaluation of the protection system based on SCD is completed.

The SCD-based protection system reliability evaluation technology of the present invention can automatically generate a protection system reliability block diagram by analyzing the SCD file, and use the protection operation state information obtained online to perform static or online reliability evaluation based on the reliability evaluation theory and algorithm , can effectively discover the defects and hidden fault risks of the relay protection, improve the availability of the relay protection system, and lay the foundation for promoting the condition-based maintenance of the relay protection system.

Claims (7)

1. A relay protection system reliability online assessment system based on SCD, it is characterized in that, comprises: network communication module, man-machine interface module, model analysis module, data processing module, reliability evaluation module, wherein: man-machine interface The module outputs the received SCD file to the model analysis module, and receives the basic components analyzed by the model analysis module; the man-machine interface module performs reliability modeling on the basic components based on reliability analysis theory and human-computer interaction mode, and Send the reliability model of the basic components to the reliability evaluation module; the model analysis module analyzes the received SCD file to obtain the protection system configuration plan, converts it into the RBD of the protection system, and outputs it to the reliability evaluation module; the network communication module connects SV, GOOSE, MMS network, collect the original message information reflecting the operation status of the protection system and output it to the data processing module; the data processing module processes the SV, GOOSE, MMS messages in the original message information into reliability simulation analysis The intermediate data of the protection system are output to the reliability evaluation module; the reliability evaluation module conducts the static reliability analysis and analysis of the reliability model of the basic components, the RBD of the protection system, and the intermediate data of the protection system according to the reliability analysis theory and the reliability simulation algorithm. Online reliability evaluation and analysis, and the evaluation results are sent to the data processing module for storage. 2. The SCD-based relay protection system reliability online assessment system according to claim 1, wherein said network communication module comprises: a network communication unit and a data transmission unit, wherein: the network communication unit receives data from The system of the protection system operates the original message and the reliability evaluation data call request from the grid; the data transmission unit sends the original message to the data processing module, and calls the data of the data processing module according to the call request from the grid. 3. The SCD-based relay protection system reliability online evaluation system according to claim 1, wherein the man-machine interface module includes: a data read-in unit, a man-machine operation unit and a visual display unit, wherein : The data reading unit obtains the SCD file and outputs it to the model analysis module; the man-machine operation unit receives manual operation instructions, reads the SCD file and performs reliability modeling on the basic components; the visual display unit receives information from the data processing module, and uses QT technology realizes the visual display of reliability evaluation results. 4. the relay protection system reliability online evaluation system based on SCD according to claim 1, it is characterized in that, described model analysis module comprises: model analysis unit, RBD conversion unit, wherein: model analysis unit is to SCD file Analyze and obtain the basic components of various protection systems and send them to the man-machine interface module; the RBD conversion unit converts the configuration of the protection system into RBD based on physical connection and functional logic relationship, and outputs it to the reliability evaluation module. 5. The online evaluation system for relay protection system reliability based on SCD according to claim 1, wherein said data processing module comprises: a message processing unit and a data storage unit, wherein: the message processing unit will The original message is processed into intermediate data, and the data storage unit stores the evaluation result and intermediate data from the reliability evaluation module. 6. The SCD-based relay protection system reliability online evaluation system according to claim 1, wherein said reliability evaluation module includes: a static evaluation unit and an online evaluation unit, wherein: the static evaluation unit receives from The reliability model of the basic components of the human-machine interface module and the RBD of the model analysis module; evaluate the static reliability of the protection system based on the reliability analysis algorithm; the online evaluation unit combines RBD, intermediate data and maintenance strategies to realize the protection based on the reliability evaluation algorithm Systematic online reliability assessment. 7. A reliability online evaluation method according to any one of claims 1 to 6, characterized in that it comprises the following steps: S100: Obtain the SCD file through the man-machine interface, analyze and obtain the composition scheme of the protection system and the basic components constituting the protection system; S200: complete the reliability modeling of the basic components of the protection system through the man-machine interface; S300: convert the protection system composition scheme obtained after analyzing the SCD into a protection system RBD, and use it as an input data source for reliability analysis; S400: Obtain the running status message information of the protection system online, and process it into the intermediate data required for reliability analysis according to the theory of reliability analysis; S500: Based on the reliability model of the basic components of the protection system, RBD and intermediate data, use reliability analysis theories and algorithms to conduct static reliability analysis based on the protection system RBD, or online reliability analysis based on operating status information; Thus, the reliability evaluation of the protection system based on SCD is completed.