Power communication coupling safety assessment system and method

Abstract

The invention relates to the technical field of intelligent power grids, in particular to a power communication coupling safety evaluation system and method, and the system comprises a data collection module which is used for collecting fault information, including a fault of a power communication network and an operation fault of a power grid; the data topological graph analysis module is used for analyzing the relevance between the equipment fault of the power communication network and the operation fault of the power network, and constructing a topological graph of an alarm event between the power communication network and the power network; the first construction module is used for evaluating the weight of each single-side maintenance safety index; the second construction module is used for evaluating the weight of each dual-network coupling maintenance safety index; and the risk early warning module is used for carrying out risk early warning to a user according to the construction result of the topological graph of the alarm event between the power communication network and the power network, the evaluation result of the weight of each single-side maintenance safety index in the maintenance area and the evaluation result of the weight of each dual-network coupling maintenance risk index. According to the invention, the security of electric power communication is improved.

Description

Technical Field

[0001] The present invention relates to the field of smart grid technology, and in particular to a power communication coupling security assessment system and method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] With the continuous development of power systems and the popularization of power communication networks, the close coupling relationship between power grids and communication networks has become more and more significant. In order to ensure the safety and stable operation of the entire power system, it is necessary to identify and evaluate the associated risks of power grids and power communication networks during the maintenance process from a holistic perspective.

[0004] Chinese patent publication number CN104701989A discloses a method for modeling the heterogeneous dual-network coupling of power grid and communication network under the background of smart grid, including the following steps: establishing a power grid logic diagram model according to the network characteristics of the power grid; establishing a communication network logic diagram model according to the network characteristics of the communication network; establishing a heterogeneous dual-network coupling model based on the power grid logic diagram model and the communication network logic diagram model; realizing the interaction between the power grid logic diagram model, the communication network logic diagram model and the heterogeneous dual-network coupling model in the time domain. The invention constructs a heterogeneous dual-network coupling model based on the network characteristics of the power grid and the communication network, which is mainly used for hybrid modeling and simulation of power grid and communication network. The simulation conclusion is used to evaluate the reliability and safety of systems such as smart substations, microgrids, and wide-area control and protection. It can be seen that when analyzing the security of power communication, the scheme only analyzes a small number of objective factors, and there is a problem of low power communication security. Summary of the invention

[0005] The object of the present invention is to provide a power communication coupling safety assessment system and method to solve at least one of the problems existing in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] Data acquisition module, used to collect fault information;

[0008] A data topology analysis module is used to analyze the correlation between power communication network equipment failure and power grid operation failure based on the collected fault information, and to construct a topology map of alarm events between the power communication network and the power grid;

[0009] The first building module is used to evaluate the weight of each single-side maintenance safety index based on the expert's single optical cable segment interruption risk score, single equipment failure risk score and multi-point failure risk score;

[0010] The second construction module is used to evaluate the weight of each dual-network coupling maintenance safety index based on the expert's power line maintenance risk score, substation transformer maintenance risk score, substation guide cable maintenance risk score, communication power supply maintenance risk score and core board maintenance risk score;

[0011] The risk warning module is used to provide risk warnings to users based on the construction results of the topological map of alarm events between the power communication network and the power grid, the evaluation results of the weights of the single-side maintenance safety indicators in the maintenance area, and the evaluation results of the weights of the dual-network coupled maintenance risk indicators.

[0012] Furthermore, the data topology analysis module includes a correlation analysis unit and a data topology analysis unit, and the correlation analysis unit analyzes the impact of the power communication network equipment failure on the power grid business relying on the communication network as the correlation between the power communication network equipment failure and the power grid operation failure.

[0013] Furthermore, the data topology analysis unit constructs a topology map of alarm events between the power communication network and the power grid according to the correlation between the power communication network equipment failure and the power grid operation failure.

[0014] Furthermore, the first building module includes a standardized analysis unit, a weight analysis unit, an information entropy analysis unit and a weight analysis unit. The standardized analysis unit is used to perform standardized processing and analysis on the scores of each single-sided maintenance safety index according to the obtained expert's risk score for interruption of a single optical cable segment, the risk score for failure of a single device and the risk score for multi-point failure, and standardize the score of the j-th single-sided maintenance safety index given by the ith expert. The standardized analysis unit sets the score of the j-th single-sided maintenance safety index given by the ith expert after standardized processing as Yi j.

[0015] Furthermore, the proportion analysis unit is used to calculate the proportion of each single-sided maintenance safety indicator score in each expert score based on the standardized expert scores of each single-sided maintenance safety indicator, and the weight analysis unit sets the proportion of the j-th single-sided maintenance safety indicator in the i-th expert score to Pi j.

[0016] Furthermore, the information entropy analysis unit is used to analyze the information entropy of each single-sided maintenance safety index score according to the calculation result of the proportion of each single-sided maintenance safety index score in each expert score, and set the information entropy of the j-th single-sided maintenance safety index score to Ej.

[0017] Furthermore, the weight analysis unit is used to analyze the weights of each single-sided maintenance safety indicator according to the analysis results of the information entropy of each single-sided maintenance safety indicator, and the weight analysis unit sets the weight of the j-th single-sided maintenance safety indicator to Wj.

[0018] Furthermore, the second construction module evaluates the weights of each dual-network coupling maintenance safety indicator based on the obtained experts' power line maintenance risk scores, substation transformer maintenance risk scores, substation guide optical cable maintenance risk scores, communication power supply maintenance risk scores and core board maintenance risk scores, so as to obtain the standardized score Qi r of the rth dual-network coupling maintenance safety indicator by the i-th expert and the weight Tr of the rth dual-network coupling maintenance safety indicator.

[0019] Furthermore, the risk warning module includes a first warning unit and a second warning unit, wherein the first warning unit is used to evaluate the risk of unilateral maintenance in the maintenance area according to the construction result of the topological diagram of the alarm event between the power communication network and the power grid in the maintenance area and the evaluation result of the weight of each unilateral maintenance safety index in the maintenance area, wherein:

[0020] like The first early warning unit determines that the risk of single-side maintenance in the maintenance area is normal and does not issue a single-side maintenance risk early warning;

[0021] like The first warning unit determines that the risk of unilateral maintenance in the maintenance area is abnormal, and issues a unilateral maintenance risk warning to the user, and at the same time sends the user an alarm event corresponding to the unilateral maintenance risk in the maintenance area in the topology diagram of the alarm event between the power communication network and the power grid, where u1 is the first risk threshold, and GWj is the weight coefficient of the j-th unilateral maintenance safety index;

[0022] The second early warning unit is used to evaluate the dual-network coupling maintenance risk according to the construction result of the topological diagram of the alarm event between the power communication network and the power grid in the maintenance area and the evaluation result of the weight of the dual-network coupling maintenance risk index in the maintenance area, wherein:

[0023] like The second early warning unit determines that the dual-network coupling maintenance risk in the maintenance area is normal and does not issue a dual-network coupling maintenance risk early warning;

[0024] like The second early warning unit determines that the dual-network coupling maintenance risk in the maintenance area is abnormal and does not issue a dual-network coupling maintenance risk warning; and issues a dual-network coupling maintenance risk warning in the maintenance area to the user, and at the same time sends to the user an alarm event corresponding to the dual-network coupling maintenance risk in the maintenance area in the topology diagram of the alarm event between the power communication network and the power grid, u2 is the second risk threshold, and GTr is the weight coefficient of the rth dual-network coupling maintenance safety index.

[0025] In addition, this embodiment also provides a method for evaluating the safety of power communication coupling, including:

[0026] Step S1: Collect fault information;

[0027] Step S2: Analyze the correlation between the power communication network equipment failure and the power grid operation failure according to the collected fault information, and construct a topological diagram of the alarm event between the power communication network and the power grid;

[0028] Step S3: Evaluate the weight of each single-side maintenance safety index according to the obtained expert's single optical cable segment interruption risk score, single equipment failure risk score and multi-point failure risk score;

[0029] Step S4: Evaluate the weight of each dual-network coupling maintenance safety index according to the expert's power line maintenance risk score, substation transformer maintenance risk score, substation guide cable maintenance risk score, communication power supply maintenance risk score and core board maintenance risk score;

[0030] Step S5: Provide risk warning to users based on the construction results of the topological map of alarm events between the power communication network and the power grid, the evaluation results of the weights of the single-side maintenance safety indicators in the maintenance area, and the evaluation results of the weights of the dual-network coupling maintenance risk indicators.

[0031] The beneficial effects of the present invention are as follows: the system realizes the collection, analysis and evaluation of fault information of the power communication network and the power network through the collaborative work of multiple modules and units. It not only improves the efficiency of obtaining and processing fault information, but also provides timely support for operation and maintenance decisions through the risk warning mechanism. The overall system enhances the safety and reliability of the power system, reduces the risks caused by faults, and improves the quality of power services. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their description are used to explain the present invention but do not constitute a limitation of the present invention.

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 Schematic diagram of the structure of the power communication coupling safety assessment system of this embodiment.

[0035] Figure 2 Schematic diagram of the structure of the data topology analysis module in this embodiment.

[0036] Figure 3This is a schematic diagram of the structure of the first building block of this embodiment.

[0037] Figure 4 Schematic diagram of the structure of the risk warning module of this embodiment.

[0038] Figure 5 Schematic diagram of the flow of the power communication coupling security assessment method of this embodiment. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0040] It should be noted that, although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0041] See also Figure 1 As shown, it is a schematic diagram of the structure of this embodiment, the system includes:

[0042] A data acquisition module is used to collect fault information, wherein the fault information includes faults of the power communication network and operational faults of the power network. In this embodiment, no specific limitation is made to the setting of the faults of the power communication network equipment and the operational faults of the power network. Those skilled in the art can set them freely, and only need to meet the setting requirements of the faults of the power communication network equipment and the operational faults of the power network. Among them, the faults of the power communication network equipment include but are not limited to the faults of optical cables, power supplies, and transmission equipment, and the operational faults of the power network include but are not limited to the faults of relay protection devices and stabilization and control systems. In this embodiment, no specific limitation is made to the collection of fault information, and those skilled in the art can set them freely, and only need to meet the collection requirements of fault information. Among them, the fault information can be collected through interaction.

[0043] Please continue reading Figure 1 As shown, the system also includes a data topology analysis module, which is connected to the data acquisition module and is used to analyze the correlation between the power communication network equipment failure and the power grid operation failure based on the collected fault information, and to construct a topology map of the alarm events between the power communication network and the power grid.

[0044] Please continue reading Figure 2As shown, the data topology analysis module includes a correlation analysis unit, which is used to use the impact of power communication network equipment failure on power grid services relying on the communication network as the correlation between power communication network equipment failure and power grid operation failure; by analyzing the correlation between power communication network equipment failure and power grid operation failure, potential risks can be identified in advance and the safety of the power system can be improved.

[0045] Specifically, the correlation between the power communication network equipment failure and the power grid operation failure described in this embodiment may be that the maintenance of the communication network may cause power failure of the power relay protection equipment, communication interruption and other problems, and the maintenance of the power grid may also affect the key optical cable lines of the communication network, resulting in interruption of the communication channel, etc.

[0046] Please continue reading Figure 2 As shown, the data topology analysis module includes a data topology analysis unit, which is connected to the correlation analysis unit and is used to construct a topology map of alarm events between the power communication network and the power grid according to the correlation between the power communication network equipment failure and the power grid operation failure; by constructing the topology map of the alarm event, the system can intuitively display the relationship between the failures and assist the operation and maintenance personnel to quickly locate the problem.

[0047] Specifically, in this embodiment, no specific limitation is made on the construction of the data topology map, and those skilled in the art can freely set it as long as the construction requirements of the data topology map are met. Among them, the data topology structure can be established through the knowledge representation methods of "entity-attribute-attribute value" and "concept-relationship-concept", and the key business and fault alarm data of the power grid and the power communication network are integrated. Natural language processing and machine learning technologies are used to automatically extract fault events and alarm information from different data sources to form a fault knowledge base, and by eliminating data redundancy and conflicts, information from different data sources is aligned, and the data topology map is constructed by selecting appropriate graph database technology to efficiently store and manage the constructed data topology map.

[0048] Please continue reading Figure 1 As shown, the system also includes a first building module, which is used to evaluate the weight of each single-side maintenance safety index score based on the expert's single optical cable segment interruption risk score, single equipment failure risk score and multi-point failure risk score.

[0049] See also Figure 3 As shown, the safety index construction module includes a standardized analysis unit, which is used to perform standardized processing and analysis on each single-side maintenance safety index score based on the expert's single optical cable segment interruption risk score, single equipment failure risk score and multi-point failure risk score, wherein:

[0050] The standardized analysis unit standardizes the experts' scores on each single-sided maintenance safety indicator, and standardizes the score of the i-th expert on the j-th single-sided maintenance safety indicator. The standardized analysis unit sets the score of the i-th expert on the j-th single-sided maintenance safety indicator after standardization as Yi j, and sets Yi j = [Xi j-min(Xj)] / [max(Xj)-min(Xj)], wherein Xi j is the score of the i-th expert on the j-th single-sided maintenance safety indicator, min(Xj) is the minimum value of the scores of all experts on the j-th single-sided maintenance safety indicator, and max(Xj) is the maximum value of the scores of all experts on the j-th single-sided maintenance safety indicator; the standardized analysis unit eliminates the subjective differences in the scores of different experts, so that the scoring results are more consistent, and the credibility of the evaluation is improved.

[0051] Please continue reading Figure 3 As shown, the first building module includes a weight analysis unit, which is connected to the standardization analysis unit, and is used to calculate the weight of each single-side maintenance safety index score in each expert score according to the expert score of each single-side maintenance safety index after standardization. The weight analysis unit sets the weight of the j-th single-side maintenance safety index in the i-th expert score to Pij, and sets:

[0052] n is the number of experts.

[0053] Please continue reading Figure 3 As shown, the first building module includes an information entropy analysis unit, which is connected to the weight analysis unit and is used to analyze the information entropy of each single-side maintenance safety index score according to the calculation result of the weight of each single-side maintenance safety index score in each expert score, wherein:

[0054] The information entropy analysis unit sets the information entropy of the j-th single-side maintenance safety index score to Ej, and sets:

[0055] By analyzing information entropy to quantify the diversity and uncertainty of expert evaluation information, the evaluation accuracy of safety indicators is further enhanced.

[0056] Please continue reading Figure 3 As shown, the first building block also includes a weight analysis unit, which is connected to the information entropy analysis unit and is used to analyze the weights of various single-side maintenance safety indicators according to the analysis results of the information entropy of each single-side maintenance safety indicator. The weight analysis unit sets the weight of the j-th single-side maintenance safety indicator to Wj, and sets m is the number of single-side maintenance safety indicators, where k is a constant, and its value is k = 1 / ln(n); the relative importance of each indicator is evaluated by analyzing each weight, thereby improving the accuracy of power communication risk warning.

[0057] Please continue reading Figure 1 As shown, the system also includes a second building module, which is connected to the first building module, and is used to evaluate the weights of each dual-network coupling maintenance safety indicator according to the experts' acquired power line maintenance risk scores, substation transformer maintenance risk scores, substation guide optical cable maintenance risk scores, communication power supply maintenance risk scores and core board maintenance risk scores. The second building module sets the score of the rth dual-network coupling maintenance safety indicator of the i-th expert after standardized processing to Qi r, and sets the weight of the rth dual-network coupling maintenance safety indicator to Tr.

[0058] Specifically, the analysis process of Qi r and Tr is the same as the analysis process of Yi j and Wj described above, and will not be repeated in this embodiment.

[0059] Please continue reading Figure 1 As shown, the system also includes a risk warning module, which is connected to the second construction module and is used to provide risk warnings to users based on the construction results of the topological map of the alarm events between the power communication network and the power grid, the evaluation results of the weights of the single-side maintenance safety indicators in the maintenance area, and the evaluation results of the weights of the dual-network coupling maintenance risk indicators.

[0060] Please continue reading Figure 4 As shown, the risk warning module includes a first warning unit, which is used to evaluate the single-side maintenance risk of the maintenance area according to the construction result of the topological map of the alarm event between the power communication network and the power grid in the maintenance area and the evaluation result of the weight of each single-side maintenance safety index in the maintenance area, wherein:

[0061] like The first early warning unit determines that the risk of single-side maintenance in the maintenance area is normal and does not issue a single-side maintenance risk early warning;

[0062] like The first early warning unit determines that the risk of single-sided maintenance in the maintenance area is abnormal, and issues a single-sided maintenance risk warning to the user, and at the same time sends the alarm event corresponding to the single-sided maintenance risk in the maintenance area in the topology diagram of the alarm event between the power communication network and the power grid to the user, u1 is the first risk threshold, GWj is the weight coefficient of the j-th single-sided maintenance safety indicator, when the j-th single-sided maintenance safety indicator is in normal state, GWj takes a value of 0, and when the j-th single-sided maintenance safety indicator is in abnormal state, GWj takes a value of Wj; the first early warning unit can monitor the single-sided maintenance risk and issue an alarm in time when the risk is abnormal to ensure the safety of the system.

[0063] Please continue reading Figure 4 As shown, the risk warning module includes a second warning unit, which is connected to the first warning unit, and is used to evaluate the dual-network coupling maintenance risk according to the construction result of the topological map of the alarm event between the power communication network and the power grid in the maintenance area and the evaluation result of the weight of the dual-network coupling maintenance safety index in the maintenance area, wherein:

[0064] like The second early warning unit determines that the dual-network coupling maintenance risk in the maintenance area is normal and does not issue a dual-network coupling maintenance risk early warning;

[0065] like The second early warning unit determines that the dual-network coupling maintenance risk in the maintenance area is abnormal, and does not issue a dual-network coupling maintenance risk warning; and issues a dual-network coupling maintenance risk warning in the maintenance area to the user, and at the same time sends the user an alarm event corresponding to the dual-network coupling maintenance risk in the maintenance area in the topology diagram of the alarm event between the power communication network and the power grid, u2 is the second risk threshold, GTr is the weight coefficient of the r-th dual-network coupling maintenance safety indicator, M is the number of dual-network coupling maintenance safety indicators, when the r-th dual-network coupling maintenance safety indicator is in normal state, GTr takes a value of 0, and when the r-th dual-network coupling maintenance safety indicator is in abnormal state, GTr takes a value of Tr; the second early warning unit effectively monitors the dual-network coupling maintenance risk, can prevent possible linkage failures, and maintain the stability of the power communication network.

[0066] Specifically, in this embodiment, the setting of the first risk threshold and the second risk threshold is not specifically limited, and technical personnel in this field can set them freely as long as the setting requirements of the first risk threshold and the second risk threshold are met. Among them, the optimal value of u1 is 0.42, and the optimal value of u2 is 0.45.

[0067] Specifically, in this embodiment, there is no specific limitation on the method for obtaining the status of each indicator in the maintenance area, and technical personnel in this field can set it freely, as long as the requirements for obtaining the status of each indicator in the maintenance area are met. Among them, the status of each indicator in the maintenance area can be obtained through interaction.

[0068] See also Figure 5 As shown, it is a schematic diagram of a flow chart of a method for evaluating the safety of power communication coupling according to this embodiment, including:

[0069] Step S1: Collect fault information;

[0070] Step S2: Analyze the correlation between the power communication network equipment failure and the power grid operation failure according to the collected fault information, and construct a topological diagram of the alarm event between the power communication network and the power grid;

[0071] Step S3: Evaluate the weight of each single-side maintenance safety index according to the obtained expert's single optical cable segment interruption risk score, single equipment failure risk score and multi-point failure risk score;

[0072] Step S4: Evaluate the weight of each dual-network coupling maintenance safety index according to the expert's power line maintenance risk score, substation transformer maintenance risk score, substation guide cable maintenance risk score, communication power supply maintenance risk score and core board maintenance risk score;

[0073] Step S5: Provide risk warning to users based on the construction results of the topological map of alarm events between the power communication network and the power grid, the evaluation results of the weights of the single-side maintenance safety indicators in the maintenance area, and the evaluation results of the weights of the dual-network coupling maintenance risk indicators.

[0074] Specifically, the expert scoring of each indicator in this embodiment is achieved through an expert scoring table, in which each expert scores the importance of each indicator based on experience. The indicator importance is divided into ten integers from 1 to 10. The smaller the number, the lower the importance, and vice versa. For example, 1 is the least important and 10 is the most important. It can be obtained through interaction.

[0075] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the embodiments here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A power communication coupling safety assessment system, characterized in that: include, Data acquisition module, used to collect fault information; A data topology analysis module is used to analyze the correlation between power communication network equipment failure and power grid operation failure based on the collected fault information, and to construct a topology map of alarm events between the power communication network and the power grid; The first building module is used to evaluate the weight of each single-side maintenance safety index based on the expert's single optical cable segment interruption risk score, single equipment failure risk score and multi-point failure risk score; The second construction module is used to evaluate the weight of each dual-network coupling maintenance safety index based on the expert's power line maintenance risk score, substation transformer maintenance risk score, substation guide cable maintenance risk score, communication power supply maintenance risk score and core board maintenance risk score; The risk warning module is used to provide risk warnings to users based on the construction results of the topological map of alarm events between the power communication network and the power grid, the evaluation results of the weights of the single-side maintenance safety indicators in the maintenance area, and the evaluation results of the weights of the dual-network coupled maintenance risk indicators.

2. The power communication coupling safety assessment system according to claim 1, characterized in that: The data topology analysis module includes a correlation analysis unit and a data topology analysis unit. The correlation analysis unit analyzes the impact of power communication network equipment failure on power grid services relying on the communication network as the correlation between power communication network equipment failure and power grid operation failure.

3. The power communication coupling safety assessment system according to claim 2, characterized in that: The data topology analysis unit constructs a topology map of alarm events between the power communication network and the power grid according to the correlation between the power communication network equipment failure and the power grid operation failure.

4. The power communication coupling safety assessment system according to claim 3, characterized in that: The first construction module includes a standardized analysis unit, a weight analysis unit, an information entropy analysis unit and a weight analysis unit. The standardized analysis unit is used to perform standardized processing and analysis on the scores of each single-sided maintenance safety index according to the obtained expert's risk score for interruption of a single optical cable segment, the risk score for failure of a single device and the risk score for multi-point failure, and to standardize the score of the j-th single-sided maintenance safety index by the ith expert. The standardized analysis unit sets the score of the j-th single-sided maintenance safety index by the ith expert after standardized processing as Yij.

5. The power communication coupling safety assessment system according to claim 4, characterized in that: The weight analysis unit is used to calculate the weight of each single-sided maintenance safety indicator score in each expert score based on the standardized expert scores of each single-sided maintenance safety indicator, and the weight analysis unit sets the weight of the j-th single-sided maintenance safety indicator in the i-th expert score to Pij.

6. The power communication coupling safety assessment system according to claim 5, characterized in that: The information entropy analysis unit is used to analyze the information entropy of each single-sided maintenance safety index score according to the calculation result of the proportion of each single-sided maintenance safety index score in each expert score, and set the information entropy of the j-th single-sided maintenance safety index score to Ej.

7. The power communication coupling safety assessment system according to claim 6, characterized in that: The weight analysis unit is used to analyze the weights of various single-sided maintenance safety indicators according to the analysis results of the information entropy of each single-sided maintenance safety indicator. The weight analysis unit sets the weight of the j-th single-sided maintenance safety indicator as Wj.

8. The power communication coupling safety assessment system according to claim 7, characterized in that: The second construction module evaluates the weights of each dual-network coupling maintenance safety indicator based on the experts' acquired power line maintenance risk scores, substation transformer maintenance risk scores, substation guide optical cable maintenance risk scores, communication power supply maintenance risk scores and core board maintenance risk scores, so as to obtain the standardized score Qir of the rth dual-network coupling maintenance safety indicator by the i-th expert and the weight Tr of the rth dual-network coupling maintenance safety indicator.

9. The power communication coupling safety assessment system according to claim 8, characterized in that: The risk warning module includes a first warning unit and a second warning unit. The first warning unit is used to evaluate the single-side maintenance risk of the maintenance area according to the construction result of the topological diagram of the alarm event between the power communication network and the power grid in the maintenance area and the evaluation result of the weight of each single-side maintenance safety index in the maintenance area, wherein: like The first early warning unit determines that the risk of single-side maintenance in the maintenance area is normal and does not issue a single-side maintenance risk early warning; like The first warning unit determines that the risk of unilateral maintenance in the maintenance area is abnormal, and issues a unilateral maintenance risk warning to the user, and at the same time sends the user an alarm event corresponding to the unilateral maintenance risk in the maintenance area in the topology diagram of the alarm event between the power communication network and the power grid, where u1 is the first risk threshold, and GWj is the weight coefficient of the j-th unilateral maintenance safety index; The second early warning unit is used to evaluate the dual-network coupling maintenance risk according to the construction result of the topological diagram of the alarm event between the power communication network and the power grid in the maintenance area and the evaluation result of the weight of the dual-network coupling maintenance risk index in the maintenance area, wherein: like The second early warning unit determines that the dual-network coupling maintenance risk in the maintenance area is normal and does not issue a dual-network coupling maintenance risk early warning; like The second early warning unit determines that the dual-network coupling maintenance risk in the maintenance area is abnormal and does not issue a dual-network coupling maintenance risk warning; and issues a dual-network coupling maintenance risk warning in the maintenance area to the user, and at the same time sends to the user an alarm event corresponding to the dual-network coupling maintenance risk in the maintenance area in the topology diagram of the alarm event between the power communication network and the power grid, u2 is the second risk threshold, and GTr is the weight coefficient of the rth dual-network coupling maintenance safety index.

10. A method for evaluating the safety of power communication coupling, applied to the power communication coupling safety evaluation system according to any one of claims 1 to 9, characterized in that: include: Step S1: Collect fault information; Step S2: Analyze the correlation between the power communication network equipment failure and the power grid operation failure according to the collected fault information, and construct a topological diagram of the alarm event between the power communication network and the power grid; Step S3: Evaluate the weight of each single-side maintenance safety index according to the obtained expert's single optical cable segment interruption risk score, single equipment failure risk score and multi-point failure risk score; Step S4: Evaluate the weight of each dual-network coupling maintenance safety index according to the expert's power line maintenance risk score, substation transformer maintenance risk score, substation guide cable maintenance risk score, communication power supply maintenance risk score and core board maintenance risk score; Step S5: Provide risk warning to users based on the construction results of the topological map of alarm events between the power communication network and the power grid, the evaluation results of the weights of the single-side maintenance safety indicators in the maintenance area, and the evaluation results of the weights of the dual-network coupling maintenance risk indicators.

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