Transformer substation monitoring system function mechanism logic model construction method

Abstract

The invention discloses a method for constructing a functional mechanism logic model of a substation monitoring system. According to the method, firstly, the types and characteristics of monitoring data of a transformer substation monitoring system are researched, and the monitoring data of the transformer substation monitoring system can be divided into operation information, action information, alarm information and control commands according to purposes and reflect the operation state of secondary equipment. Secondly, a module division principle covering the whole function process of the monitoring host, the gateway machine and the measurement and control device is researched, and functional tasks mainly borne by the monitoring host, the data gateway machine and the measurement and control device are specifically divided; furthermore, according to the divided functions, key links and key monitoring data of the divided functions are extracted from the three types of equipment respectively, and a function mechanism logic model of the transformer substation monitoring system is constructed based on underlying logic design of function implementation, an algorithm principle and a relationship of information transmission in the whole business process.

Description

Technical Field

[0001] The present invention relates to the field of power system automation, and in particular to a method for constructing a functional mechanism logic model of a substation monitoring system. Background Art

[0002] The substation monitoring system includes various equipment such as monitoring host, data communication gateway, measurement and control devices, etc. It is a key facility to ensure the safety of the power grid and the basis for monitoring and controlling the power grid dispatching and substation operation. The uncertainty of the supply and demand sides of the new power system will make the adjustment of the power grid operation mode and the centralized monitoring operation more complicated and frequent. Therefore, the correctness and integrity of the substation monitoring system function are increasingly important for the support of the safe and stable operation of the power grid. However, at present, the abnormalities in system data processing and uploading, the failure of remote operation due to functional loss, etc. still occur from time to time, which has caused many power grid accidents. For example: in recent years, there have been incidents in China where a nearby wind farm was disconnected from the grid due to the miscontrol of the dispatching AGC caused by the abnormal telemetry of the substation, the main transformer was de-energized due to the error of the remote control association of the substation, and the switch and knife switch were pulled incorrectly due to the abnormal flip of the memory of the measurement and control device. In addition, the abnormal telesignaling in the "814 US-Canada Blackout" accident abroad was also the direct cause of the expansion of the accident. The causes of the above accidents are all directly related to the abnormal functions of the substation monitoring system. Since the main functions of the monitoring system are realized by multiple types of equipment including monitoring host, data gateway, measurement and control device, and switch, the normal function is related to many factors such as device hardware, system software, network traffic, CPU load, etc. The internal logic and processing mechanism are very complex and difficult to monitor. When an abnormality occurs, the system lacks accurate analysis and active alarm at the functional level, which can easily lead to misjudgment by dispatching personnel and systems such as AGC and AVC. It can also cause important instructions such as grid operation mode adjustment and load transfer to be unable to be executed quickly, directly affecting the safe and reliable power supply of the grid.

[0003] Therefore, this patent provides a method for constructing a logical model of the functional mechanism of a substation monitoring system, which realizes the logical abstraction of the entire functional process of the substation monitoring system and the collection of key node status, and solves the pain point problem that system function abnormality troubleshooting is difficult and time-consuming. Summary of the invention

[0004] The purpose of the present invention is to provide a method for constructing a functional mechanism logic model of a substation monitoring system. After the method is applied, the logical abstraction of the entire functional process and the collection of key node states can be realized, and the knowable and perceptible capabilities of the substation secondary system can be enhanced.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A method for constructing a functional mechanism logic model of a substation monitoring system, the method comprising:

[0007] Step 1: Study the monitoring data types and characteristics of the substation monitoring system;

[0008] Step 2: Study the module division principle covering the whole process of monitoring host, gateway machine and measurement and control device;

[0009] Step 3: Extract the key links and key monitoring data of the main functions of each device and build a functional mechanism logic model of the substation monitoring system;

[0010] It can be seen from the technical solution provided by the present invention that the above method is to complete the logical abstraction and key node status collection of the entire process of monitoring key business functions through standardized modeling of the internal logic and functions of the substation monitoring system, break through the traditional barrier of invisible secondary system information, and realize the visualization of secondary system monitoring and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0012] Figure 1 A flow chart for constructing a functional mechanism logic model of a substation monitoring system according to an embodiment of the present invention;

[0013] Figure 2 This is an example of a partial functional mechanism model of the substation monitoring system described in an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0015] The embodiment of the present invention will be further described in detail below with reference to the accompanying drawings. The method includes:

[0016] Step 1: Study the monitoring data types and characteristics of the substation monitoring system;

[0017] In step 1, the specific process is:

[0018] The monitoring data of the substation monitoring system can be divided into four categories according to their use: operation information, action information, alarm information, and control commands. Secondary equipment status monitoring information is mainly included in the operation information, and some alarm signals such as device failure and communication interruption are included in the alarm information. Action information and control commands also reflect the operating status of secondary equipment. Table 1 shows the specific content of the four types of data.

[0019] Table 1 Monitoring data of substation monitoring system

[0020]

[0021] Step 2: Study the module division principle covering the whole process of monitoring host, gateway machine and measurement and control device;

[0022] In step 2, the specific process is:

[0023] Taking the core business functions of the substation monitoring system such as remote control, background control, one-button sequential control, electrical quantity measurement, and state quantity collection as the object, the realization process of these functions is sorted out, and the relationship between the main equipment such as the monitoring host, data gateway, and measurement and control device in the "assembly line" of business function realization and the functional tasks they undertake are analyzed. The underlying logic design, algorithm principles, and information transmission relationship of each device function are studied, and the equipment functions are decomposed into a functional chain composed of key functional points.

[0024] The main functions and tasks of the monitoring host, data gateway, and measurement and control device are as follows:

[0025] 1) Monitoring host. The monitoring host is the core of the substation monitoring system. Its key functions can be abstracted into two categories: acquisition and measurement and control. The acquisition and measurement functions mainly include electrical quantity measurement and state quantity acquisition; for the control functions, the monitoring host uniformly formulates the instruction format, determines the attributes of the initiating node based on the received instructions, determines whether to send it directly to the interval layer device or forward it to the comprehensive application host, and ensures that only one operation process is in progress in the substation at the same time.

[0026] 2) Data gateway. The core business functions of the data gateway are sorted out, mainly including remote control function, data collection monitoring and forwarding data monitoring. For control functions, the data gateway receives the unified standard instructions issued by the dispatching master station, and after instruction analysis, sends the control command to the measurement and control device; for data collection monitoring, the data gateway receives the telesignaling / telemetry data sent by other secondary devices through intra-station communication, and uploads it to the master station in a unified protocol format after protocol conversion based on the received data quality, type and other parameters; for forwarding table data monitoring, on the one hand, it is necessary to establish channel connections with the master stations at all levels such as network dispatching, provincial dispatching, and local dispatching, and configure relevant channel parameters. On the other hand, the gateway collects data based on the IEC61850 communication protocol, and through mapping, constructs 104 and other forwarding structure data to realize the export of the three remote data of the gateway machine to the dispatching master station.

[0027] 3) Measurement and control device. The core business functions of the measurement and control device are sorted out, which mainly include remote control function, telemetering function, telesignaling function and cross-interval locking function. For the remote control function, after receiving the external remote control command, the measurement and control device parses the command, generates the corresponding remote control signal according to the parsed command and sends it to the target device; for the telemetering function, the measurement and control device collects voltage and current data in real time, and performs corresponding processing to calculate the effective values ​​of voltage, current, power, power factor, frequency and other quantities, and sends them to the monitoring host and superior dispatch through the communication network; for the telesignaling function, the measurement and control device is connected to the equipment's sensors, control switches and protection devices, and collects the equipment's status information and alarm signals in real time; for the cross-interval five-protection function, the measurement and control device performs logical judgment according to the interlocking logic, generates the corresponding control signal, and sends the signal to the target device through a communication link or hard connection.

[0028] Step 3: Extract the key links and key monitoring data of the main functions of each device and build a functional mechanism logic model of the substation monitoring system;

[0029] In step 3, the specific process is:

[0030] According to the information interaction relationship of the main functions of each device in step 2, extract the key links and corresponding key monitoring data from the input, output and intermediate data of each node of each functional process, clarify the required data type, format, attribute and other elements, and summarize the key link division and key monitoring data extraction according to the monitoring host, data communication gateway, and measurement and control device.

[0031] Taking the acquisition and measurement function of the monitoring host as an example, its key links can be abstracted as follows:

[0032] 1) Original message reception; 2) Message parsing and data model establishment; 3) Validity check; 4) Manual blocking; 5) Update real-time database; 6) Graphic refresh service; 7) Visual display.

[0033] Considering the input, output and intermediate data processing process of each link, the status monitoring data of each key functional link is extracted, and after sorting, the important status information of refined functional modeling is formed, and finally the functional mechanism logic model of the substation monitoring system is constructed. Table 2 is an example of some functional mechanism logic models of the monitoring host of the substation monitoring system.

[0034] Table 2 Partial functional mechanism logic model of the monitoring host of the substation monitoring system

[0035]

[0036]

[0037] It is worth noting that the contents not described in detail in the embodiments of the present invention belong to the prior art known to professional and technical personnel in the field.

[0038] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for constructing a functional mechanism logic model of a substation monitoring system, characterized in that: The method comprises: Step 1: Study the monitoring data types and characteristics of the substation monitoring system; Step 2: Study the module division principle covering the whole process of monitoring host, gateway machine and measurement and control device; Step 3: Extract the key links and key monitoring data of the main functions of each device, and build a functional mechanism logic model of the substation monitoring system.

2. The method for constructing a functional mechanism logic model of a substation monitoring system according to claim 1 is characterized in that: In step 1, the monitoring data types and characteristics of the substation monitoring system are studied, and the specific process is as follows: The monitoring data of the substation monitoring system can be divided into four categories according to their use: operation information, action information, alarm information, and control commands. Secondary equipment status monitoring information is mainly included in the operation information, and some alarm signals such as device failure and communication interruption are included in the alarm information. Action information and control commands also reflect the operating status of secondary equipment. Table 1 shows the specific content of the four types of data. Table 1 Monitoring data of substation monitoring system 3. The method for constructing a functional mechanism logic model of a substation monitoring system according to claim 1 is characterized in that: In step 2, the principle of module division covering the entire functional process of the monitoring host, gateway machine, and measurement and control device is studied. The specific process is as follows: Taking the core business functions of the substation monitoring system, such as remote control, background control, one-button sequential control, electrical quantity measurement, and state quantity acquisition, as the object, this paper sorts out the implementation process of these functions, and analyzes the relationship between the main equipment such as the monitoring host, data gateway, and measurement and control device in the "assembly line" of business function implementation and the functional tasks they undertake. Study the underlying logic design, algorithm principles, and information transmission relationships of each device function throughout the entire business process, and decompose the device functions into a functional chain consisting of key functional points. The main functions and tasks of the monitoring host, data gateway, and measurement and control device are as follows: 1) Monitoring host. The monitoring host is the core of the substation monitoring system. Its key functions can be abstracted into two categories: acquisition and measurement and control. The acquisition and measurement functions mainly include electrical quantity measurement and state quantity acquisition; for the control functions, the monitoring host uniformly formulates the instruction format, determines the attributes of the initiating node based on the received instructions, determines whether to send it directly to the interval layer device or forward it to the comprehensive application host, and ensures that only one operation process is in progress in the substation at the same time. 2) Data gateway. The core business functions of the data gateway are sorted out, mainly including remote control function, data collection monitoring and forwarding data monitoring. For control functions, the data gateway receives the unified standard instructions issued by the dispatching master station, and after instruction analysis, sends the control command to the measurement and control device; for data collection monitoring, the data gateway receives the telesignaling / telemetry data sent by other secondary devices through intra-station communication, and uploads it to the master station in a unified protocol format after protocol conversion based on the received data quality, type and other parameters; for forwarding table data monitoring, on the one hand, it is necessary to establish channel connections with the master stations at all levels such as network dispatching, provincial dispatching, and local dispatching, and configure relevant channel parameters. On the other hand, the gateway collects data based on the IEC61850 communication protocol, and through mapping, constructs 104 and other forwarding structure data to realize the export of the three remote data of the gateway machine to the dispatching master station. 3) Measurement and control device. The core business functions of the measurement and control device are sorted out, which mainly include remote control function, telemetering function, telesignaling function and cross-interval locking function. For the remote control function, after receiving the external remote control command, the measurement and control device parses the command, generates the corresponding remote control signal according to the parsed command and sends it to the target device; for the telemetering function, the measurement and control device collects voltage and current data in real time, and performs corresponding processing to calculate the effective values ​​of voltage, current, power, power factor, frequency and other quantities, and sends them to the monitoring host and superior dispatch through the communication network; for the telesignaling function, the measurement and control device is connected to the equipment's sensors, control switches and protection devices, and collects the equipment's status information and alarm signals in real time; for the cross-interval five-protection function, the measurement and control device performs logical judgment according to the interlocking logic, generates the corresponding control signal, and sends the signal to the target device through a communication link or hard connection.

4. The method for constructing a functional mechanism logic model of a substation monitoring system according to claim 1 is characterized in that: In step 3, the key links and key monitoring data of the main functions of each device are extracted to construct a functional mechanism logic model of the substation monitoring system. The specific process is as follows: According to the information interaction relationship of the main functions of each device in step 2, extract the key links and corresponding key monitoring data from the input, output and intermediate data of each node of each functional process, clarify the required data type, format, attribute and other elements, and summarize the key link division and key monitoring data extraction according to the monitoring host, data communication gateway, and measurement and control device. Taking the acquisition and measurement function of the monitoring host as an example, its key links can be abstracted as follows: 1) Original message reception; 2) Message parsing and data model establishment; 3) Validity check; 4) Manual blocking; 5) Update real-time database; 6) Graphic refresh service; 7) Visual display. Considering the input, output and intermediate data processing process of each link, the status monitoring data of each key functional link is extracted, and after sorting, the important status information of refined functional modeling is formed, and finally the functional mechanism logic model of the substation monitoring system is constructed. Table 2 is an example of some functional mechanism logic models of the monitoring host of the substation monitoring system. Table 2 Partial functional mechanism logic model of the monitoring host of the substation monitoring system

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