CN103605787A - Method and system for evaluating and analyzing relay protection - Google Patents

Abstract

The present invention is applicable to the technical field of smart grid, and provides a relay protection evaluation and analysis method and system. The method includes: according to the fixed value data provided by the fault recorder and the relay protection device, the action of the protection device is analyzed. Analyze, obtain and manage data information, create information data and build a database; create an analysis model of the relay protection device, the analysis model includes an operation reason analysis model and a correction analysis model; according to the current operating status of the relay protection device, find the Information database, find the corresponding analysis model, and calculate the evaluation results. The present invention can analyze the cause of the failure to the greatest extent according to the operating state of the relay protection device, and the staff can overhaul the relay protection device according to the reasons to effectively ensure the safety of electrical equipment and the stable operation of the power system, and avoid the occurrence of protection failures. Incorrect actions such as misoperation and refusal of the device.

Description

Evaluation and Analysis Method and System for Relay Protection

technical field

The invention belongs to the technical field of smart grids, and in particular relates to a relay protection evaluation and analysis method and system.

Background technique

At present, the construction of power grids in my country and even in the world has fully entered the era of smart grids. The three-step strategy of the State Grid Corporation of China has further strengthened the implementation of smart grids. The goal of the smart grid is to achieve a unified and strong power grid. As the first security of the power system, the status and role of relay protection have always been self-evident. Quick action, selectivity, reliability and sensitivity are the four basic requirements of relay protection, and selectivity is the key factor that runs through and coordinates with each other. Relay protection is inseparable from the setting of the fixed value from the scheme design to the product application. To a large extent, the calculation of relay protection setting is to make choices on selectivity and sensitivity, especially in medium and low voltage power grids. Therefore, the coordination analysis of the action characteristics of the relay protection in the whole network is very important.

With the continuous expansion of the power system, large-capacity units and high-voltage equipment have been put into operation one after another, the power equipment system is becoming larger and larger, and the principle structure of relay protection is becoming more and more complex. Although the development trend of relay protection is to make the management of protection more standardized, the configuration of protection functions more perfect, and the action behavior of protection more reliable. However, the incorrect action of the relay protection device still exists. If the protection device cannot operate correctly and quickly remove the fault, the accident will inevitably expand and affect the stable operation of the power system. Therefore, the correct action of the relay protection device is particularly important.

Whether the relay protection device can function correctly depends on the correct and reliable setting calculation. After the setting work is completed, whether the setting of the protection setting is correct, whether the sensitivity meets the needs of actual operation, and verify whether the existing protection principle meets the requirements of the system. Operational requirements, so that the relay protection device can function correctly. At present, in power transmission applications, there is no online action behavior evaluation and analysis scheme for relay protection devices, so that the safety of electrical equipment and the stable operation of the power system cannot be guaranteed, and incorrect actions and refusals of protective devices often occur. action.

Contents of the invention

In view of the above problems, the purpose of the present invention is to provide a relay protection evaluation and analysis method and system, which can effectively ensure the safety of electrical equipment and the stable operation of the power system, and avoid incorrect actions such as malfunctioning and refusal of protective devices.

On the one hand, the relay protection evaluation and analysis method includes the following steps:

According to the fixed value data provided by the fault recorder and relay protection device, analyze the action of the protection device, acquire and manage data information, and create information data and database;

Create an analysis model of the relay protection device, the analysis model includes an operation cause analysis model and a correction analysis model;

According to the current operating state of the relay protection device, the information database is searched, a corresponding analysis model is found, and an evaluation result is calculated.

On the other hand, the relay protection evaluation and analysis system includes:

The database building unit is used to analyze the action of the protection device according to the fixed value data provided by the fault recorder and the relay protection device, acquire and manage data information, and create information data to build a database;

An analysis model building unit is used to create an analysis model of the relay protection device, the analysis model includes an operation cause analysis model and a correction analysis model;

The result calculation unit is used to search the information database according to the current operating state of the relay protection device, find the corresponding analysis model, and calculate the evaluation result.

The beneficial effects of the present invention are: the present invention finds the corresponding state quantities and operation modules from the information database according to the current operation state of the relay protection device by creating an information database and an analysis model, starts the operation module, and finds out from the analysis model Matching conditions, and then output the corresponding evaluation results, the evaluation results indicate the most likely reason for the current operating state of the relay protection device, the staff can check the relay protection device according to the evaluation results, eliminate errors, and ensure the electrical equipment safety and stable operation of the power system.

Description of drawings

Fig. 1 is the flow chart of the relay protection evaluation analysis method provided by the embodiment of the present invention;

Fig. 2 is the specific flowchart of step S1 in Fig. 1;

Fig. 3 is the specific flowchart of step S3 among Fig. 1;

Fig. 4 is the structural block diagram of the relay protection evaluation analysis system that the embodiment of the present invention provides;

Fig. 5 is a structural block diagram of the database establishment unit provided by the embodiment of the present invention;

Fig. 6 is a structural block diagram of a result calculation unit provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.

Fig. 1 shows the flow of the relay protection evaluation and analysis method provided by the embodiment of the present invention, and only shows the parts related to the embodiment of the present invention for convenience of description.

The relay protection evaluation and analysis method provided in this embodiment includes the following steps:

Step S1, according to the fixed value data provided by the fault recorder and the relay protection device, analyze the action of the protection device, acquire and manage data information, and create information data to build a database;

Step S2, creating an analysis model of the relay protection device, the analysis model includes an operation cause analysis model and a correction analysis model;

Step S3, according to the current operating state of the relay protection device, search the information database, find the corresponding analysis model, and calculate the evaluation result.

The fixed value data is generally saved in the COMTRADE file format, and the records contain four files, which are: header file, configuration file, data file and information file. These four files should have the same file name, and they are only different by description. Type file extensions are distinguished. For each sample in the data file, the data file contains the sample number, time stamp and data value for each channel. All data in the data file is in integer format. According to the fixed value data, analyze various action conditions of the protection device, acquire and manage data information, and create information data to build a database.

Preferably, as shown in Figure 2, the step S1 includes:

Step S11, obtaining the fixed value state quantity, the fault state quantity and the protection action state quantity;

Step S12: Generate operation modules of each link through the logical principles of the relay protection device in conjunction with the fixed value state quantities, fault state quantities and protection action state quantities, and store the above three state quantities and operation modules to create an information database.

The action status of the relay protection device can generally be expressed by the fixed value state quantity, the fault state quantity and the protection action state quantity. Organized into a table form for the system to read; the fault state quantity is obtained by obtaining the data volume required at each time point, and the protection action state quantity is obtained from the data interface input by the user. After obtaining the fixed value state quantity, fault state quantity and protection action state quantity, combined with the logic principle of the relay protection device, the operation modules of each link are generated, including the fault type module, fault range module, protection start module, protection trip module and Reclosing module, etc.

In the above step S2, the analysis model includes an operation reason analysis model and a correction analysis model, the analysis model is composed of conditions and results, and is stored in the form of two numbered arrays, and the operation cause analysis model is mainly based on the relay protection in different operation In this case, the operation effect is analyzed, and the revised analysis model is mainly to find the most suitable evaluation result output when there are multiple matching conditions. The results mainly include two types of correct actions and incorrect actions, and include the specific reasons for incorrect actions. item factor. The emergence of these factors are all obtained according to the analysis process of logical principles. According to the calculation of the protection modules of each link and the realization of the logical topology connection, the operation cause analysis model is formed, and the reasons for correct actions and incorrect actions and fault links are saved.

Preferably, as shown in Figure 3, the step S3 includes:

Step S31, obtaining the current operating state of the relay protection device;

Step S32, finding the corresponding state quantities and operating modules from the information database;

Step S33, scan the operation reason analysis model, and inquire about matching conditions;

Step S34, when there is a matching condition, output the corresponding result as the evaluation result of the relay protection device.

In the step S34, there may be more than one matching condition, so here continue to scan and correct the analysis model, call the credibility calculation method based on the weight method, calculate the propagation coefficient of different matching conditions, and then select the matching condition with the largest propagation coefficient, And output the corresponding result as the evaluation result of the relay protection device.

表示规则所有证据可信度的加权平均值；

表示修正的证据可信度加权平均值。当可信度越大，或者权值越大的时候，传播系数CF(C_i-1→C_i)就越大。选择传播系数最大的匹配条件，并输出对应结果作为继电保护装置的评价结果。First, different results generated by the same condition are combined into a result set Con={Con1,...,Conk}, a weight tk is assigned to different matching conditions, and the propagation coefficient is calculated according to the weight $\mathrm{CF}(C_{i-1}\&Right\; Arrow;C_i)=x\·\underset{k=1}{\overset{\mathrm{no}}{\mathrm{\Σ}}}{t}_k{l}_k,t_k\&Greater\; Equal;0.5,k=\mathrm{1,2}\·\·\&Center\; Dot;,\mathrm{no},\&Center\; Dot;\&Center\; Dot;\·,$ Among them, X is the correction coefficient, lk is the corresponding value of the matching condition, t _k l _k represents the weighted absolute reliability of the conclusion, and t _k is the weighting coefficient (weight);

Represents the weighted average of the credibility of all the evidence for the rule;

Represents the weighted average of the revised evidence confidence. When the reliability is greater or the weight is greater, the propagation coefficient CF(C _i-1 →C _i ) is greater. Select the matching condition with the largest propagation coefficient, and output the corresponding result as the evaluation result of the relay protection device.

In addition, this embodiment also provides a relay protection evaluation and analysis system, as shown in Figure 4, including:

The database building unit 41 is used to analyze the action of the protection device according to the fixed value data provided by the fault recorder and the relay protection device, acquire and manage data information, and create information data to build a database;

An analysis model building unit 42, configured to create an analysis model of the relay protection device, the analysis model includes an operation cause analysis model and a correction analysis model;

The result calculation unit 43 is configured to search the information database according to the current operating state of the relay protection device, find a corresponding analysis model, and calculate the evaluation result.

Preferably, as shown in Figure 5, the database establishment unit 41 includes:

A state quantity acquisition module 411, configured to acquire a fixed value state quantity, a fault state quantity and a protection action state quantity;

The data creation module 412 is used to generate the operation modules of each link through the logical principle of the relay protection device in conjunction with the fixed value state quantity, the fault state quantity and the protection action state quantity, and store the above three state quantities and the operation module to create an information database .

Preferably, the result calculation unit 43 includes:

The running state obtaining module 431 is used to obtain the current running state of the relay protection device;

A data search module 432, configured to find the corresponding state quantities and operating modules from the information database;

The condition matching module 433 is used to scan the operation reason analysis model and query the matching conditions;

The result calculation module 434 is configured to output a corresponding result as an evaluation result of the relay protection device when there is a matching condition.

Preferably, the result calculation module 434 includes:

The correction module unit is used to scan and correct the analysis model when there is more than one matching condition;

The propagation coefficient calculation unit is used to call the credibility calculation method based on the weight method to calculate the propagation coefficient for different matching conditions;

The result output unit is used to select the matching condition with the largest propagation coefficient, and output the corresponding result as the evaluation result of the relay protection device.

In summary, the present invention provides a relay protection evaluation and analysis method and system. Through the technical solution of the present invention, the cause of the failure can be analyzed to the greatest extent according to the operating status of the relay protection device. The maintenance of electrical protection devices can effectively guarantee the safety of electrical equipment and the stable operation of the power system, and avoid incorrect actions such as false operation and refusal of protection devices.

Those of ordinary skill in the art can understand that all or part of the steps in the method of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. Storage media, such as ROM/RAM, magnetic disk, optical disk, etc.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. a relay protection evaluation analysis method, is characterized in that, described method comprises:

The value data providing according to fault oscillograph and protective relaying device, analyzes the action situation of protective device, obtains and management data information, creates information data and builds storehouse;

Create the analytical model of protective relaying device, described analytical model comprises operation analysis of causes model and correction analysis model;

According to the current running status of protective relaying device, search described information database, find corresponding analytical model, and calculate evaluation result.

2. method as claimed in claim 1, is characterized in that, the described value data providing according to fault oscillograph and protective relaying device; action situation to protective device is analyzed; obtain and management data information, create information data and build storehouse step, specifically comprise:

Obtain definite value quantity of state, failure volume and protection operating state amount;

Logic theory by protective relaying device coordinates described definite value quantity of state, failure volume and protection operating state amount to generate the operation module of links, stores above-mentioned three quantity of states and operation module creation information database.

3. method as claimed in claim 2, is characterized in that, described operation module comprises that fault type module, fault coverage module, protection start module, trip protection module and reclosing module.

4. method as claimed in claim 3, is characterized in that, describedly according to the current running status of protective relaying device, searches described information database, finds corresponding analytical model, and calculates evaluation result step, specifically comprises:

Obtain the current running status of protective relaying device;

From described information database, find corresponding quantity of state and operation module;

Scanning operation analysis of causes model, the condition of match query;

When there is matching condition, export corresponding result as the evaluation result of protective relaying device.

5. method as claimed in claim 4, is characterized in that, described when there is matching condition, exports corresponding result as the evaluation result of protective relaying device, specifically comprises:

When there being more than one of matching condition and matching condition, scanning correction analysis model;

Call the confidence level computing method based on weights method, Different matching condition is carried out to propagation coefficient calculating;

Select the matching condition of propagation coefficient maximum, and export corresponding result as the evaluation result of protective relaying device.

6. method as claimed in claim 5, is characterized in that, described in call the confidence level computing method based on weights method, Different matching condition is carried out to propagation coefficient calculation procedure, specifically comprise:

To different matching conditions, give corresponding weights tk;

According to weights, calculate propagation coefficient $\mathrm{CF}(C_{i-1}\→C_i)=X\·\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{t}_k{l}_k,t_k\≥0.5,k=\mathrm{1,2}\·\·\·,n,\·\·\·,$ Wherein, X is correction factor, and lk is the corresponding numerical value of matching condition.

7. a relay protection the system of analysis and appraisal, is characterized in that, described system comprises:

Database unit, for the value data providing according to fault oscillograph and protective relaying device, analyzes the action situation of protective device, obtains and management data information, creates information data and builds storehouse;

Analytical model is set up unit, and for creating the analytical model of protective relaying device, described analytical model comprises operation analysis of causes model and correction analysis model;

Result computing unit, for according to the current running status of protective relaying device, searches described information database, finds corresponding analytical model, and calculates evaluation result.

8. system as described in right haughtiness 7, is characterized in that, described Database unit comprises:

Quantity of state acquisition module, for obtaining definite value quantity of state, failure volume and protection operating state amount;

Data creation module, coordinates described definite value quantity of state, failure volume and protection operating state amount to generate the operation module of links for the logic theory by protective relaying device, stores above-mentioned three quantity of states and operation module creation information database.

9. system as claimed in claim 8, is characterized in that, described result computing unit comprises:

Running status acquisition module, for obtaining the current running status of protective relaying device;

Data search module, for finding corresponding quantity of state and operation module from described information database;

Condition Matching module, for scanning operation analysis of causes model, the condition of match query;

Result computing module, for when there is matching condition, exports corresponding result as the evaluation result of protective relaying device.

10. system as claimed in claim 9, is characterized in that, described result computing module comprises:

Correcting module unit, for when there being more than one of matching condition and matching condition, scans correction analysis model;

Propagation coefficient computing unit, for calling the confidence level computing method based on weights method, carries out propagation coefficient calculating to Different matching condition;

Result output unit, for selecting the matching condition of propagation coefficient maximum, and exports corresponding result as the evaluation result of protective relaying device.

Images