Distribution network protection information monitoring and control method and system

Abstract

The present invention relates to the technical field of power system automation, and in particular to a distribution network protection information monitoring and control method and system, which is applied to a three-level communication structure of a distribution network, wherein the three-level communication structure comprises a distribution network substation, a local protection monitoring system and a superior protection monitoring system, and comprises the following steps: S1: in the local protection monitoring system, a protection command exchange area is created, wherein the protection command exchange area is provided with a security filtering mechanism; S2: configuration initialization of the distribution network substation is performed, and the superior protection monitoring system and the local protection monitoring system automatically call the configuration information of the distribution network substation; S3: the superior protection monitoring system and the local protection monitoring system automatically send a general call command to each distribution network substation at a fixed time; S4: the superior protection monitoring system sends a time synchronization command to the local protection monitoring system at a fixed time. The method reduces the communication difficulty between the superior protection monitoring system and the distribution network substation, and plays a role in ensuring the safety of the distribution network communication.

Description

Technical Field

[0001] The present invention relates to the technical field of power system automation, and in particular to a distribution network protection information monitoring and control method and system. Background Art

[0002] The monitoring of distribution network protection information is an important part of the development of the entire distribution network. Realizing the real-time and accuracy of distribution network protection information monitoring, so that it can better adapt to the arrival of the big data era, is of great significance to the development of the entire distribution network. In order to realize the monitoring of distribution network protection information, it is necessary to interact with the protection commands between the distribution network substation and the superior protection monitoring system. At present, the distribution network substation is directly governed by the power companies at the district level and cannot communicate directly with the superior protection monitoring system under the jurisdiction of the municipal level. In addition, the number of distribution network substations is huge and the locations are scattered, which further increases the difficulty of communication with the superior protection monitoring system. Therefore, how to realize the interaction of protection commands between the distribution network substation and the superior protection monitoring system and ensure the security of distribution network communication during the interaction is a problem that current distribution network users focus on and urgently need to solve.

[0003] The Chinese invention patent application with publication number CN111432295A discloses a main station system for electricity consumption information collection based on distributed technology, including a communication layer, a storage layer and an application layer; the communication layer is used to establish and maintain the communication link between the terminal and the main station, forward communication messages, assemble and parse messages, and then realize multi-task high-concurrency asynchronous communication interaction; the storage layer is used to store high-frequency collection data, daily frozen data and business interaction data, statistical data and full-volume collection data, and perform mining data analysis based on historical data; the application layer is used to realize advanced business applications; the communication layer and the storage layer are interoperable, and the storage layer and the application layer are interoperable. The above-mentioned public scheme solves the performance bottleneck of data collection and storage in the collection system, completes the rapid concurrent collection and storage of big data in the main station system for electricity consumption information collection, and provides a new technical support for the construction and development of the power system. The main station system for electricity consumption information collection based on distributed technology. Although the above-mentioned public scheme solves the high-throughput writing and data collection of distributed and large-scale electricity consumption information, the distributed and large-scale electricity consumption information writing scenario in the public scheme is different from the information interaction between the large number of distributed and dispersed distribution substations in the distribution network and the superior protection and monitoring system. Therefore, the above-mentioned public scheme does not provide a protection information interaction solution between the distribution substation and the superior protection and monitoring system, nor does it provide a solution to ensure the communication security of the distribution network during the information interaction process. Summary of the invention

[0004] Technical purpose: In order to overcome the deficiencies in the prior art, the present invention provides a distribution network protection information monitoring and control method and system.

[0005] Technical solution: To achieve the above-mentioned purpose, the distribution network protection information monitoring and control method disclosed in the present invention is applied to the three-level communication structure of the distribution network, wherein the three-level communication structure includes a distribution network substation, a local protection monitoring system and an upper-level protection monitoring system, and comprises the following steps:

[0006] S1: in the local protection monitoring system, creating a protection command exchange area for implementing the interactive protection commands between the upper protection monitoring system and the distribution network substation, wherein the protection command exchange area is provided with a security filtering mechanism;

[0007] S2: After the protection command exchange area is successfully created, the configuration of the distribution network substation is initialized, and the upper protection monitoring system and the local protection monitoring system automatically call the configuration information of the distribution network substation. If the configuration information call command comes from the upper protection monitoring system, the returned configuration information is submitted through the protection command exchange area. Otherwise, the local protection monitoring system configuration is automatically parsed and stored;

[0008] S3: The superior protection monitoring system and the local protection monitoring system automatically send a general call command to each distribution network substation at a regular time to obtain the normal operation information of each device in the distribution network substation;

[0009] S4: The superior protection monitoring system sends a time synchronization command to the local protection monitoring system at regular intervals to achieve consistency between the clocks of the two systems.

[0010] Furthermore, the steps of the method for creating the protection command exchange area are as follows:

[0011] S1.1: When the program is initialized, the local protection monitoring system is defined to store the protection command structure PROTBUF;

[0012] S1.2: Call the CreateShareMem service to apply for a command interaction space whose size is RTUNUMS×PROTBUFNUMS structures PROTBUF, where RTUNUMS is the number of the distribution network substations, and PROTBUFNUMS is the command space of each distribution network substation.

[0013] Furthermore, the security filtering mechanism verifies the command header, command length and check code of the protection command, and the command can be placed in the protection command exchange area only after passing the verification.

[0014] Furthermore, the steps of the protection command interaction between the upper protection monitoring system and each distribution network substation are as follows:

[0015] S101: The program detects that a protection command needs to be issued to a distribution network substation or sent to a superior protection monitoring system, and the security filtering mechanism verifies the protection command;

[0016] S102: After verification, locate the starting position of the protection command in the protection command exchange area through the distribution network substation index ID associated with the protection command;

[0017] S103: starting from the starting position, cyclically scanning the command space of the distribution network substation, finding the position currently marked as "unused", placing the protection command therein and marking it as "used";

[0018] S104: The program periodically scans the protection command exchange area in a loop to find the command space marked as "used". When the sending conditions are normal, the protection command in the area is taken out and sent to the corresponding command channel for delivery. At the same time, the "used" command space is changed to "unused". For protection commands that are in abnormal sending conditions for a long time, they are cleared and their corresponding command spaces are marked as "unused".

[0019] Furthermore, if the general call command in step S3 comes from the superior protection monitoring system, the general call information fed back by the distribution network substation is submitted via the protection command exchange area; if the general call command comes from the local protection monitoring system, the general call information fed back by the distribution network substation is processed via local analysis.

[0020] Furthermore, the superior protection monitoring system and the local protection monitoring system can also manually send any device operation information call command to each of the distribution network substations, and obtain the device operation information in real time.

[0021] Furthermore, the distribution network substation can actively upload important protection information. After receiving the important protection information, the local protection monitoring system performs local analysis and processing on the one hand, and submits it to the superior protection monitoring system through the protection command exchange area on the other hand. The important protection information includes protection action change and fault report information.

[0022] The present invention also provides a distribution network protection information monitoring and control system, comprising:

[0023] A protection command exchange area management module is used to create a protection command exchange area with a security filtering mechanism;

[0024] The configuration initialization module is used to call the configuration information of the distribution network substation and perform configuration initialization after the protection command exchange area is successfully created;

[0025] The general call processing module, the upper protection monitoring system and the local protection monitoring system automatically and regularly call each distribution substation to obtain the regular operation information of each device in the distribution substation;

[0026] The protection operation information processing module includes two parts: calling of operation information and active uploading of protection information. The superior protection monitoring system and the local protection monitoring system can manually send any device operation information calling command to each distribution network substation, and the distribution network substation can also actively upload important protection information;

[0027] The system timing module is used for the superior protection and monitoring system to send timing commands to the local protection and monitoring system at regular intervals.

[0028] The beneficial effects of the present invention are:

[0029] 1. This method adopts a three-level communication structure. The distribution network substation first communicates with the local protection monitoring system, and then the local protection monitoring system communicates with the superior protection monitoring system. In this way, the superior protection monitoring system can "indirectly" communicate with the distribution network substation. When the number of distribution network substations is large and their locations are scattered, the communication difficulty between the superior protection monitoring system and the distribution network substations is reduced.

[0030] 2. When the local protection monitoring system communicates with the superior protection monitoring system and the distribution network substation, the security filtering mechanism of the protection command exchange area can effectively filter out invalid data information or data that may affect network security, extract safe and valid data information, and then upload and send data, which plays a role in ensuring the security of distribution network communications.

[0031] 3. Both the two-level protection and monitoring systems can monitor the operation status of each distribution substation in real time. The distribution substation can also actively send important operation information. In order to ensure the normal interaction process of the general call of each distribution substation and the manually issued device operation information call command between the superior protection and monitoring system and the local protection and monitoring system, a mutually exclusive strategy is adopted with other command processes to improve the information transmission efficiency and data communication efficiency.

[0032] 4. The protection command exchange area management module, configuration initialization module, general call processing module, protection operation information processing module and system timing module configured in this system solve the communication problem between the local protection monitoring system and the superior protection monitoring system and the large number of distributed network substations with dispersed locations. It can be adjusted and adapted to different power applications or communication network environments, so that the above-mentioned distribution network protection information monitoring and control method can be realized and applied more widely. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is an overall flow chart of the distribution network protection information monitoring and control method in the present invention;

[0034] Figure 2 It is a schematic diagram of the three-level communication structure in the present invention;

[0035] Figure 3 A flow chart of a method for creating a protection command exchange area in the present invention;

[0036] Figure 4 It is a flow chart of protection command interaction between the upper-level protection monitoring system and the distribution network substation in the present invention. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1 To Attachment Figure 4 The principles and features of the present invention are described, and the examples given are only used to explain the present invention, rather than to limit the scope of the present invention.

[0038] Embodiment 1: A distribution network protection information monitoring and control method is applied to a three-level communication structure of a distribution network, such as Figure 1-Figure 3 As shown, the three-level communication structure includes distribution network substation, local protection monitoring system and superior protection monitoring system. The local protection monitoring system refers to the district-level distribution network master station monitoring system, and the superior protection monitoring system refers to the municipal-level distribution network master station monitoring system.

[0039] The distribution network protection information monitoring and control method comprises the following steps:

[0040] S1: In the local protection monitoring system, a protection command exchange area is created to implement interactive protection commands between the superior protection monitoring system and the distribution network substation.

[0041] The steps for creating a protection command exchange area are as follows:

[0042] S1.1: When the program is initialized, the local protection monitoring system is defined to store the protection command structure PROTBUF;

[0043] S1.2: Call the CreateShareMem service to apply for a command interaction space, whose size is RTUNUMS×PROTBUFNUMS structures PROTBUF, where RTUNUMS is the number of distribution network substations and PROTBUFNUMS is the command space for each distribution network substation. Specifically, at the beginning of the program, a command space of PROTBUFNUMS size is applied for each distribution network substation.

[0044] The protection command exchange area is equipped with a security filtering mechanism. Before the protection command is placed in the protection command exchange area, it needs to be verified by the security filtering mechanism. The security filtering mechanism will verify the command header, command length and check code of the protection command. Only after the verification is passed can it be placed in the protection command exchange area. The security filtering mechanism will verify the content and format of the protection command, filter out the protection command with verification errors, effectively prevent invalid protection commands or protection commands that affect network security, and play a good role in protecting the communication security of the distribution network.

[0045] S2: After the protection command exchange area is successfully created, the configuration of the distribution network substation is initialized, and the upper protection monitoring system and the local protection monitoring system automatically call the configuration information of the distribution network substation. If the configuration information call command comes from the upper protection monitoring system, the returned configuration information is submitted through the protection command exchange area. Otherwise, the local protection monitoring system configuration is automatically parsed and stored. In this embodiment, the configuration information includes: device information, group information, set value information, soft pressure plate information, telemetry information, telesignaling information, fault quantity information, etc.

[0046] Specifically, the local protection monitoring system actively initiates a network link with each distribution network substation. After the link is successful, it sends a communication startup message. After the other party responds, the communication with the distribution network substation is established. At the same time, as a server, it listens to the link request of the superior protection monitoring system. If the other party sends a link request, it receives the request and responds to the communication startup message of the superior protection monitoring system to complete the communication initialization with the superior protection monitoring system.

[0047] The interaction of protection commands between the superior protection monitoring system and the distribution network substation is completed through the protection command exchange area of ​​the local protection monitoring system and the corresponding access mechanism.

[0048] Both the superior protection monitoring system and the local protection monitoring system can call the configuration information of the distribution network substation. In this embodiment, it is necessary to distinguish the command source flag protSource for calling the configuration information. If the command for calling the configuration information comes from the superior protection monitoring system, it is set to PROTO_ZF_DATA. If the command for calling the configuration information comes from the local protection monitoring system, it is set to PROTO_SCADA_DATA. The command from the local protection monitoring system is not returned to the superior protection monitoring system, but is only parsed and stored in the local protection monitoring system.

[0049] The local protection monitoring system analyzes the interactive configuration information process: first, the interactive configuration information is classified and stored in the configuration file in the form of a whole network storage. The configuration file includes device configuration, device attributes, group description and group attributes. After all the configuration information is received, the SCADA module of the local protection monitoring system is notified to process the configuration information storage. After the configuration information is called, the command source flag protSource of the configuration information is reset.

[0050] like Figure 4 As shown in the figure, the steps of protection command interaction between the upper protection monitoring system and each distribution network substation are as follows:

[0051] S101: The program detects that a protection command needs to be issued to a distribution network substation or sent to a superior protection monitoring system. The security filtering mechanism first verifies the command header, command length and checksum of the protection command.

[0052] S102: After verification, the starting position of the protection command in the protection command exchange area is determined by locating the distribution network substation index ID associated with the protection command.

[0053] S103: Starting from the starting position, cyclically scan the command space of the distribution network substation, find the position currently marked as "unused", put the protection command into it and change the mark to "used", and set the protection command source, command storage time, command length, and command content. In this embodiment, the protection command source mark is usually "SEND" and "RECV", where "SEND" is the protection command sent to the distribution network substation, and "RECV" is the protection command sent to the superior protection monitoring system. The command storage time is generally the current insertion time.

[0054] S104: The program periodically scans the protection command exchange area in a loop, finds the command space marked as "used", and when the sending conditions are normal, that is, the communication is normal, takes out the protection command in it and sends it to the corresponding command channel for delivery, and changes the "used" command space to "unused". In order to prevent the accumulation of protection commands in the protection command exchange area, for protection commands that have been stored in it for a long time and have been in abnormal sending conditions for a long time, compare the difference between the current time and the command storage time. If the difference exceeds the set threshold, the protection command is cleared from the protection command exchange area and its corresponding command space is marked as "unused".

[0055] The above method can realize the access of protection commands in the protection command exchange area, thereby completing the protection command interaction between the upper-level protection monitoring system and the lower-level distribution network substation.

[0056] S3: In order to accurately obtain the routine operation information of each device in the distribution network substation, the superior protection monitoring system and the local protection monitoring system can automatically and regularly make a general call to each distribution network substation; if the general call command comes from the superior protection monitoring system, the general call information fed back by the distribution network substation is submitted via the protection command exchange area; if the general call command comes from the local protection monitoring system, the general call information fed back by the distribution network substation is processed by local analysis. In this embodiment, the general call information fed back by the distribution network substation includes: the communication status, operation status, constant value changes and telesignaling of each device in the distribution network substation, and the technicians in this field can also set the information content and time interval included in the general call information according to the actual operation needs.

[0057] Specifically, both the superior protection monitoring system and the local protection monitoring system can issue a general call command, and the two can be distinguished by the command source flag protSource. The interaction of the general call command between the superior protection monitoring system and the distribution network substation is completed through the protection command exchange area of ​​the local protection monitoring system and the corresponding access mechanism.

[0058] In order to ensure the normal interaction process of the general call command and not be interrupted by other command interactions, the interaction of the general call command enjoys priority. During the interaction of the general call command, the "general call flag" is first set in the local protection monitoring system. Other commands cannot be issued during the period when the general call command is set and can only be issued after the general call flag is reset.

[0059] After receiving the return information of the general call command, the local protection monitoring system parses out the FUN, INF and corresponding status information, and then matches the corresponding point parameter information in the "configuration information" called in step S2 according to FUN and INF, and refreshes the database table corresponding to the status information of the point.

[0060] After the general summon command interaction is completed and the local parsing is successful, the "general summon flag" is reset and the command source flag protSource is cleared to complete the general summon command process.

[0061] Both the superior protection monitoring system and the local protection monitoring system can manually send any device operation information call command to each distribution network substation and obtain the device operation information in real time. The device operation information mentioned here includes: telemetry, telesignaling, set value, soft pressure plate, fault quantity and general files, etc. When the user needs to view the operation information of any device according to actual needs, he can manually send a call command to the distribution network substation. The interaction of the device operation information call command between the superior protection monitoring system and the distribution network substation is also completed through the protection command exchange area of ​​the local protection monitoring system and the corresponding access mechanism.

[0062] Specifically, in order to ensure the normal interaction process of the device operation information call command, its interaction process also needs to be mutually exclusive with other command processes, such as the general call command, other protection commands, etc. After receiving the device operation information call command, the local protection monitoring system first sets the "device operation information call flag" and the command source flag protSource, and selects different distribution network substation channels to issue commands according to the distribution network substation index ID in the device operation information call command.

[0063] The device operation information returned by the distribution network substation needs to be processed differently according to the different command source flags protSource.

[0064] If it is determined according to the command source flag protSource that the device operation information call command is issued by the superior protection monitoring system, the device operation information returned by the distribution network substation is stored in the protection command exchange area and returned to the superior protection monitoring system.

[0065] If the command source protSource determines that the device operation information call command is issued by the local protection monitoring system, the local protection monitoring system will parse the message, extract the device address, group number, item number, value and other information, and then add the command to the message queue and set the return path Scada_Path of the message queue. The program traverses the information in the message queue in real time, detects the message with the return path Scada_Path, takes the message out of the queue, sends the message to SCADA through the platform mail sending service for storage and refresh processing, and deletes the message from the queue.

[0066] Furthermore, if the type of device operation information returned by the distribution network substation is telesignaling, the telesignaling information database table will be refreshed. If the telesignaling point changes, the alarm mechanism will be triggered and a telesignaling change alarm will be issued; if the type of device operation information returned by the distribution network substation is telemetry, the telemetry information database table will be refreshed. If the finite value judgment is required, an alarm prompt can also be issued for the telemetry point that exceeds the limit; if the type of device operation information returned by the distribution network substation is fixed value, the fixed value information database table will be refreshed, and it can be compared with the previous fixed value information. If there is a change, a difference prompt will be issued; if the device operation information returned by the distribution network substation is a general file, the general file will be saved to the entire network and stored in the directory set by the program.

[0067] The distribution network substation can also actively send important protection information, including protection action changes and fault reports. After the local protection monitoring system receives the important protection information, it will perform local analysis and processing on the one hand, and submit it to the superior protection monitoring system through the protection command exchange area on the other hand.

[0068] In this embodiment, the protection information actively sent by the distribution network substation is generally important information during operation. After receiving this information, the local protection monitoring system not only needs to parse and process it locally, but also needs to submit it to the upper protection monitoring system in a timely manner through the protection command exchange area and the corresponding access mechanism.

[0069] Specifically, for the protection action change information actively sent by the distribution network substation, on the one hand, it is submitted to the superior protection monitoring system through the access mechanism of the protection command exchange area, and on the other hand, this information is locally parsed. First, the corresponding point information is found according to the FUN and INF in the command information, and the status of the current point in the protection action change information is extracted. Then, the point and the corresponding status are refreshed to the telesignaling information database table, and a telesignaling change alarm is issued.

[0070] For the fault report information actively sent by the distribution network substation, which contains the name and number of fault recording files, first set the fault recording file call flag, parse the number of recording files contained in the fault report, and the time when the recording files were generated. Then start the process of calling the recording files, and call the recording files contained in the fault report in turn. Verify the file time and file size of the recording files that have been successfully called, and then perform waveform analysis after the verification is successful. After all the fault recording files have been successfully called, reset the call flag and the calling process ends.

[0071] The recording file information sent by the distribution network substation is the main basis for fault analysis and needs to be saved as important data in both the local protection monitoring system and the superior protection monitoring system.

[0072] S4: In order to achieve the consistency of the clocks of the superior protection monitoring system and the local protection monitoring system, the superior protection monitoring system periodically sends a time synchronization command to the local protection monitoring system.

[0073] Generally, after the system receives a fault report, the stored fault time is the time of the system's current server, so it is necessary to ensure that the server time of the superior protection monitoring system and the local protection monitoring system are consistent.

[0074] The superior protection monitoring system will periodically send synchronization messages to the local protection monitoring system. In this embodiment, the timing interval can be set, generally in seconds. After receiving the synchronization message, the local protection monitoring system extracts the time information in the message and calibrates the system time through the system platform's time calibration service.

[0075] The above method can realize timely transmission of information of distribution network substation to superior protection monitoring system, overcome the problem of large number and scattered location of distribution network substation, and reduce the communication difficulty between distribution network substation and superior protection monitoring system.

[0076] Embodiment 2: A distribution network protection information monitoring and control system can be applied to implement the distribution network protection information monitoring and control method in Embodiment 1, which includes:

[0077] The protection command exchange area management module is used to create a protection command exchange area with a security filtering mechanism in the local protection monitoring system, thereby realizing the interaction of protection commands between the superior protection monitoring system and the distribution network substation.

[0078] The configuration initialization module is used to call the configuration information of the distribution network substation and perform configuration initialization after the protection command exchange area is successfully created. Both the superior protection monitoring system and the local protection monitoring system can automatically call the configuration information of the distribution network substation. If the configuration information call command comes from the superior protection monitoring system, the returned configuration information is submitted through the protection command exchange area. Otherwise, the local protection monitoring system configuration is automatically parsed and stored.

[0079] In the general call processing module, the superior protection monitoring system and the local protection monitoring system automatically and regularly make general calls to each distribution substation to obtain the normal operation information of each device in the distribution substation; if the general call command comes from the superior protection monitoring system, the general call information fed back by the distribution substation is submitted via the protection command exchange area; if the general call command comes from the local protection monitoring system, the general call information fed back by the distribution substation is processed locally.

[0080] The protection operation information processing module includes two parts: the calling of operation information and the active sending of protection information. The superior protection monitoring system and the local protection monitoring system can manually issue a command to call the operation information of any device to each distribution substation, and obtain the operation information of each device in the distribution substation in real time; the distribution substation can also actively send important protection information. After the local protection monitoring system receives the important protection information, it will perform local analysis and processing on the one hand, and submit it to the superior protection monitoring system through the protection command exchange area on the other hand. The important protection information includes protection action change and fault report information.

[0081] The system timing module is used for the superior protection monitoring system to send timing commands to the local protection monitoring system at regular intervals, thereby achieving the consistency of the clocks of the superior protection monitoring system and the local protection monitoring system.

[0082] This device solves the communication problem between the local protection monitoring system and the upper-level protection monitoring system and a large number of distributed network substations with dispersed locations. Both levels of protection monitoring systems can monitor the operation of each substation in real time, thus ensuring the communication security of the distribution network.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A distribution network protection information monitoring and control method is applied to a three-level communication structure of a distribution network, wherein the three-level communication structure includes a distribution network substation, a local protection monitoring system and an upper-level protection monitoring system, and is characterized in that: The following steps are involved: S1: In the local protection monitoring system, a protection command exchange area is created for implementing the interactive protection commands between the upper protection monitoring system and the distribution network substation, and the protection command exchange area is provided with a security filtering mechanism; the security filtering mechanism verifies the command header, command length and check code of the protection command, and the command can be placed in the protection command exchange area only after the verification passes; The protection command interaction between the upper protection monitoring system and each distribution network substation includes the following steps: S101: The program detects that a protection command needs to be issued to a distribution network substation or sent to a superior protection monitoring system, and the security filtering mechanism verifies the protection command; S102: After verification, locate the starting position of the protection command in the protection command exchange area through the distribution network substation index ID associated with the protection command; S103: starting from the starting position, cyclically scanning the command space of the distribution network substation, finding the position currently marked as "unused", placing the protection command therein and marking it as "used"; S2: After the protection command exchange area is successfully created, the configuration of the distribution network substation is initialized, and the upper protection monitoring system and the local protection monitoring system automatically call the configuration information of the distribution network substation. If the configuration information call command comes from the upper protection monitoring system, the returned configuration information is submitted through the protection command exchange area. If the configuration information call command comes from the local protection monitoring system, the local protection monitoring system automatically parses and processes it. S3: The superior protection monitoring system and the local protection monitoring system automatically send a general call command to each distribution network substation at a regular time to obtain the normal operation information of each device in the distribution network substation; The superior protection monitoring system and the local protection monitoring system also manually send any device operation information call command to each of the distribution network substations, and obtain the device operation information in real time; The distribution network substation actively sends important protection information. After receiving the important protection information, the local protection monitoring system performs local analysis and processing on the one hand, and submits it to the upper protection monitoring system through the protection command exchange area on the other hand. The important protection information includes protection action change and fault report information; S4: The superior protection monitoring system sends a time synchronization command to the local protection monitoring system at regular intervals to achieve consistency between the clocks of the two systems.

2. The distribution network protection information monitoring and control method according to claim 1, characterized in that: The steps of creating the protection command exchange area are as follows: S1.1: When the program is initialized, the local protection monitoring system is defined to store the protection command structure PROTBUF; S1.2: Call the CreateShareMem service to apply for a command interaction space whose size is RTUNUMS×PROTBUFNUMS structures PROTBUF, where RTUNUMS is the number of the distribution network substations, and PROTBUFNUMS is the command space of each distribution network substation.

3. The distribution network protection information monitoring and control method according to claim 1, characterized in that: The protection command interaction between the upper protection monitoring system and each distribution network substation also includes the following steps: S104: The program periodically scans the protection command exchange area in a loop to find the command space marked as "used". When the sending conditions are normal, the protection command in the exchange area is taken out and sent to the corresponding command channel for delivery. At the same time, the "used" command space is changed to "unused". For protection commands that have been in abnormal sending conditions for a long time, they are cleared and their corresponding command spaces are marked as "unused".

4. The distribution network protection information monitoring and control method according to claim 1, characterized in that: If the general call command in step S3 comes from the upper-level protection monitoring system, the general call information fed back by the distribution network substation is submitted via the protection command exchange area; If the general call command comes from the local protection monitoring system, the general call information fed back by the distribution network substation is processed through local analysis.

5. A distribution network protection information monitoring and control system based on the distribution network protection information monitoring and control method according to claim 1, characterized in that: include: A protection command exchange area management module is used to create a protection command exchange area with a security filtering mechanism; The configuration initialization module is used to call the configuration information of the distribution network substation and perform configuration initialization after the protection command exchange area is successfully created; The general call processing module, the upper protection monitoring system and the local protection monitoring system automatically and regularly call each distribution substation to obtain the regular operation information of each device in the distribution substation; The protection operation information processing module includes two parts: calling for operation information and actively sending protection information. The superior protection monitoring system and the local protection monitoring system manually send a command for calling the operation information of any device to each distribution network substation, obtain the operation information of each device in the distribution network substation in real time, and the distribution network substation actively sends important protection information. The system timing module is used for the superior protection and monitoring system to send timing commands to the local protection and monitoring system at regular intervals.

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