A method and system for visually monitoring the secondary circuit of a DC control and protection system in a converter station

Abstract

The present invention discloses a method for visually monitoring the secondary circuit of a DC control and protection system in a converter station, comprising: setting a physical connection diagram style template; obtaining SER event information from a DC control and protection host to extract secondary circuit information and storing it in a SCADA system; instantiating the physical connection diagram style template to generate a monitoring screen; establishing an association between the secondary circuit information data object of the SCADA system and the graphic element of the monitoring screen; actively uploading SER event information when the relevant status of the DC control and protection host changes, and refreshing the secondary circuit status on the monitoring screen; monitoring the secondary circuit status in real time, promptly issuing an alarm when a circuit fault occurs, and visually displaying the fault circuit location on the monitoring screen. This method is applicable to visual status monitoring of the secondary circuit of a converter station, can improve the secondary circuit status monitoring capability of the converter station, help eliminate secondary circuit defects, and improve the operation and maintenance level of the converter station secondary system.

Description

Technical Field

[0001] The present invention relates to a method and system for visually monitoring a secondary circuit of a DC control and protection system of a converter station, and belongs to the technical field of high-voltage DC transmission of power systems. Background Art

[0002] With the construction and commissioning of ultra-high voltage transmission lines and converter stations, the electrical connections within the grid have become closer, while the technical difficulty of operation and management has also increased significantly. The DC control and protection system is crucial for ensuring the safe and stable operation of the power grid. Any problems in its secondary circuit can cause abnormalities in the HVDC system.

[0003] Currently, there is a lack of intuitive and effective automated means to monitor the secondary circuits of the DC control and protection systems in converter stations. Preliminary monitoring can only be carried out through alarm events in the DC monitoring background of the station. Analysis relies entirely on highly skilled technicians, and the real-time diagnostic capability is low, which cannot meet the requirements of rapid diagnosis and disposal in converter stations. Functional improvement is urgently needed. Summary of the Invention

[0004] The purpose of this application is to address the above-mentioned problems and provide a method and system for visually monitoring a secondary circuit, which can realize status monitoring of the secondary circuits of the entire station by means of a physical communication diagram.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] In one aspect, the present application provides a method for visually monitoring a secondary circuit of a DC control and protection system of a converter station, comprising:

[0007] Set the physical contact diagram style template;

[0008] Obtain SER event information from the DC control and protection host, extract event information related to the secondary circuit from the SER event information to generate secondary circuit status information, and store it in the SCADA system;

[0009] Based on the primary equipment model architecture of the converter station and the optical fiber network of the DC control and protection host, the physical connection diagram style template is instantiated to generate a monitoring screen;

[0010] Establish the association between the secondary circuit status information data object of the SCADA system and the monitoring screen graphic element;

[0011] When the status of the DC control and protection host changes, it actively sends SER event information; extracts event information related to the secondary circuit to generate secondary circuit status information, and updates the SCADA system;

[0012] Refresh the secondary circuit status of the monitoring screen according to the updated SCADA system;

[0013] The secondary circuit status is monitored in real time, an alarm is issued in time when a circuit fault occurs, and the location of the fault circuit is visually displayed on the monitoring screen.

[0014] Preferably, the event information related to the secondary circuit includes: information related to the optical fiber circuit between the DC control host, the DC protection host, the protection three-out-of-two device, the merging unit, the intelligent IO and the switch equipment.

[0015] Preferably, the physical contact diagram style templates include: a pole protection optical fiber network diagram style template, a pole control optical fiber network diagram style template, a valve protection optical fiber network diagram style template and a valve control optical fiber network diagram style template.

[0016] Preferably, the acquiring of SER event information of the DC control and protection host, extracting event information related to the secondary circuit from the SER event information to generate secondary circuit status information, and storing the information in the SCADA system specifically includes:

[0017] Connect to the DC control and protection host through the converter station SCADA network;

[0018] After the communication connection is established, the SER event information of the DC control and protection host can be obtained through the general query call;

[0019] Extracting event information related to the secondary circuit from SER event information;

[0020] Secondary circuit status information is generated based on event information related to the secondary circuit, and the secondary circuit status information is stored in the database of the SCADA system.

[0021] Preferably, the secondary circuit status specifically includes: for point-to-point communication mode, the optical fiber communication alarm signal of the DC control and protection host is used to represent the secondary circuit status; for network communication mode, the optical fiber receiving and sending data alarm signal of the DC control and protection host is used to represent the secondary circuit status after "AND operation"; when all receiving and sending data of the optical fiber communication port generate error alarms, the port status is interrupted; if there are only partial error alarms, the port status is abnormal; when there are no error alarms for receiving and sending data of the optical fiber communication port, the port status is normal.

[0022] Preferably, the method further comprises: acquiring secondary circuit information from the SCADA system at a preset frequency to refresh the secondary circuit status on the monitoring screen.

[0023] On the other hand, the present application also provides a secondary circuit visual monitoring system for a DC control and protection system of a converter station, comprising:

[0024] Style template module, screen editing module, screen monitoring module, loop monitoring service module and front-end module;

[0025] The style template module is used to set the physical contact diagram style template;

[0026] The screen editing module instantiates the physical connection diagram template based on the primary equipment model architecture of the converter station and the optical fiber network of the DC control and protection host, and generates a monitoring screen and saves it in the screen monitoring module;

[0027] The front-end module is used to obtain SER event information of the DC control and protection host and receive SER event information actively sent when the relevant status of the DC control and protection host changes, and send it to the SCADA system; the SCADA system extracts event information related to the secondary circuit from the SER event information to generate secondary circuit status information and stores it in the SCADA system;

[0028] The loop monitoring service module is used to obtain the secondary loop status from the SCADA system and send it to the screen monitoring module; it monitors the secondary loop status in real time, and promptly issues an alarm when a loop fault occurs, and sends it to the screen monitoring module;

[0029] The screen monitoring module is used to associate the secondary circuit status with the monitoring screen graphic elements and visually display the secondary circuit status on the monitoring screen.

[0030] Preferably, the physical contact diagram style templates include: a pole protection optical fiber network diagram style template, a pole control optical fiber network diagram style template, a valve protection optical fiber network diagram style template and a valve control optical fiber network diagram style template.

[0031] Preferably, the secondary circuit monitoring system is connected to the SCADA network of the first safety zone of the converter station, deployed independently or in combination with the station monitoring system, and communicates with the DC control and protection host in an online manner.

[0032] Preferably, the loop monitoring service module obtains the secondary loop status from the SCADA system specifically including: for point-to-point communication mode, using the optical fiber communication alarm signal of the DC control and protection host to represent the secondary loop status; for network communication mode, using the optical fiber receiving and sending data alarm signal of the DC control and protection host to represent the secondary loop status after "AND operation"; when all receiving and sending data of the optical fiber communication port generate error alarms, the port status is interrupted; if only some error alarms are generated, the port status is abnormal; when there are no error alarms for receiving and sending data of the optical fiber communication port, the port status is normal.

[0033] Preferably, the loop monitoring service module further obtains secondary loop information from the SCADA system at a preset frequency.

[0034] The beneficial effects of the present invention are:

[0035] By acquiring the SER events of the DC control and protection host online, extracting information related to the secondary circuit, and building an intuitive secondary circuit monitoring interface, the relationship between the secondary circuits of the DC control and protection hosts and between the control and protection hosts and other equipment is graphically displayed to achieve real-time monitoring of the operating status of the secondary circuit of the control and protection system. This can reduce the workload of manual regular inspections and improve the efficiency of system operation and maintenance. When a fiber optic link fails, the faulty fiber is displayed visually. This helps to quickly locate the fault location, reduce fault handling time, reduce power outage time, and improve system power supply reliability. The technical solution of this application provides strong technical support for improving the reliable operation of the secondary circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a flow chart of a method for visually monitoring the secondary circuit of a DC control and protection system of a converter station provided in an embodiment of the present application;

[0037] Figure 2 The figure shows a data interaction diagram of a method for visually monitoring the secondary circuit of a DC control and protection system in a converter station;

[0038] Figure 3 Is extremely protected fiber optic network diagram style template layout diagram;

[0039] Figure 4 It is a schematic diagram of the layout of the extremely controlled fiber optic network diagram style template;

[0040] Figure 5 It is a schematic diagram of the layout of the valve protection fiber optic network diagram style template;

[0041] Figure 6 It is a schematic diagram of the layout of the valve control fiber optic network diagram style template;

[0042] Figure 7 It is a structural diagram of the secondary circuit visual monitoring system of the DC control and protection system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0044] The relevant professional terms in this application are explained as follows:

[0045] SCADA (Supervisory Control And Data Acquisition) data acquisition and monitoring control

[0046] SER (Sequential Event Record)

[0047] like Figure 1 As shown, an embodiment of the present application provides a method for visually monitoring the secondary circuit of a DC control and protection system of a converter station, which specifically includes the following steps:

[0048] S100: Setting a physical contact diagram style template.

[0049] According to the characteristics of the DC control and protection system of the converter station, the secondary circuits are classified, and corresponding physical communication diagram style templates are set up respectively, including: pole protection optical fiber network diagram style template, pole control optical fiber network diagram style template, valve protection optical fiber network diagram style template and valve control optical fiber network diagram style template.

[0050] like Figure 3 This example shows an example of a pole protection fiber optic network diagram template. It consists of a pole protection system, a pole protection 2-out-of-3 system, a pole-level control switch, and an I / O unit, displaying the A / B network on a single screen. The pole protection system is connected to the I / O unit point-to-point, and to the 2-out-of-3 system point-to-point. The pole protection system is connected to the pole control unit via the pole-level control switch.

[0051] like Figure 4 This diagram shows an example of a pole control fiber optic network diagram template. It consists of a pole control, a pole-level control switch, analog I / O units, digital I / O units, and a switch, with the A / B networks shown separately. The pole control connects to the analog I / O units in a point-to-point manner, while the pole control communicates with each digital I / O unit in a networked manner. Pole controls are connected point-to-point to each other. The pole control communicates with the pole protection system via the pole-level control switch and with the valve control system via the valve group control switch.

[0052] like Figure 5 This diagram shows an example of a valve protection fiber optic network diagram template. It consists of valve protection, a three-way valve protection system, a valve group-level control switch, and an I / O unit. The A / B network is displayed on a single screen, while the high and low valves are displayed on separate screens. The valve protection system is connected to the I / O unit point-to-point, and to the three-way two-way device point-to-point. The valve protection system and valve control are connected via the valve group-level control switch.

[0053] like Figure 6 This diagram shows an example of a valve control fiber optic network diagram template. It consists of valve controls, valve group-level control switches, analog I / O units, digital I / O units, and switches, with the A / B networks shown separately. The valve controls are connected to the analog I / O units in a point-to-point manner. The valve controls are connected to the digital I / O units via I / O communication switches. Valve controls are connected to each other in a point-to-point manner. The valve controls are connected to valve protection systems via the valve group-level control switches.

[0054] S200: Obtain SER event information from the DC control and protection host, extract event information related to the secondary circuit from the SER event information to generate secondary circuit status information, and store it in the SCADA system.

[0055] Among them, event information related to the secondary circuit includes: information related to the optical fiber circuit between devices such as the DC control host, DC protection host, three-out-of-two protection device, merging unit, intelligent IO and switch.

[0056] Specifically, such as Figure 2 As shown, the monitoring system is connected to the DC control and protection host through the converter station SCADA network. After the communication connection is established, the SER event status general query command is used to obtain the SER event information of the DC control and protection host. Event information related to the secondary circuit is extracted from the SER event information. Secondary circuit status information is generated based on the secondary circuit event information and stored in the SCADA system database.

[0057] In a preferred embodiment, one method for generating secondary circuit status is to: for point-to-point communication, utilize the DC control and protection host's optical fiber communication alarm signal to indicate the secondary circuit status; for networked communication, utilize the DC control and protection host's optical fiber receive and transmit data alarm signal, combined with an "AND" operation, to indicate the secondary circuit status. If all receive and transmit data on the optical fiber communication port generates error alarms, the port status is interrupted; if only some error alarms occur, the port status is abnormal; and if no error alarms are generated for either receive or transmit data on the optical fiber communication port, the port status is normal.

[0058] S300: Based on the primary equipment model architecture of the converter station and the optical fiber network of the DC control and protection host, the physical connection diagram style template is instantiated to generate a monitoring screen.

[0059] Based on the actual primary equipment model architecture of the converter station and the optical network of the DC control and protection host, the corresponding physical connection diagram template is instantiated to generate the monitoring screen. For example, if a converter station actually has two poles, two copies of the pole protection optical network diagram template and the pole control optical network diagram template are instantiated.

[0060] S400: Establishing the association relationship between the SCADA system secondary circuit status information data object and the monitoring screen element.

[0061] Obtain secondary circuit status from the SCADA system and associate it with monitoring screen elements. This association can be automatic for semantic models and manual for general models.

[0062] S500: When the status of the DC control and protection host changes, it actively sends SER event information; extracts event information related to the secondary circuit to generate secondary circuit status information, and updates the SCADA system.

[0063] Specifically, when the DC control and protection host is in an abnormal state, it will actively send a SER event to the monitoring system. The SCADA module receives the SER event information, extracts information related to the secondary circuit, and updates the SCADA database.

[0064] S600: Refresh the secondary circuit status of the monitoring screen according to the updated SCADA system.

[0065] Specifically, the latest secondary circuit status is generated according to the secondary circuit information in the updated SCADA database, and the secondary circuit status on the monitoring screen is refreshed.

[0066] S700: Monitor the status of the secondary circuit in real time, issue an alarm in time when a circuit fault occurs, and visually display the location of the fault circuit on the monitoring screen.

[0067] In addition to actively sending SER event information when the relevant status of the DC control and protection host changes; during normal operation, the monitoring system will obtain secondary circuit information from the SCADA system at a preset frequency to refresh the secondary circuit status on the monitoring screen, completing real-time monitoring of the secondary circuit status.

[0068] When a loop fault occurs, an alarm is immediately issued, and the location of the faulty loop is visually displayed on the monitoring screen. For example, if all received and transmitted data on a port generate error alarms, the port status is interrupted, indicated by red. If only some error alarms are generated, the port status is abnormal, indicated by red. If there are no error alarms on either the received or transmitted data of the optical fiber communication port, the port status is normal, indicated by green. Different colors are used to visually display the location of the faulty loop on the monitoring screen.

[0069] The embodiment of the present application provides a visual monitoring system for the secondary circuit of the DC control and protection system of the converter station, such as Figure 7 As shown, it includes: style template module, screen editing module, screen monitoring module, loop monitoring service module and front-end module.

[0070] The style template module is used to set the physical contact diagram style template.

[0071] The screen editing module instantiates the physical connection diagram style template according to the primary equipment model architecture of the converter station and the optical fiber network of the DC control and protection host, generates a monitoring screen and saves it in the screen monitoring module.

[0072] The front-end module is used to obtain the SER event information of the DC control and protection host and receive the SER event information actively sent when the relevant status of the DC control and protection host changes, and send it to the SCADA system; the SCADA system extracts the event information related to the secondary circuit from the SER event information to generate secondary circuit status information and stores it in the SCADA system.

[0073] The loop monitoring service module is used to obtain the secondary loop status from the SCADA system and send it to the screen monitoring module; it monitors the secondary loop status in real time, and promptly alarms when a loop fault occurs and sends it to the screen monitoring module.

[0074] The screen monitoring module is used to associate the secondary circuit status with the monitoring screen graphics; the secondary circuit status is visually displayed on the monitoring screen.

[0075] In a preferred embodiment, the physical connection diagram style template includes: a pole protection optical fiber network diagram style template, a pole control optical fiber network diagram style template, a valve protection optical fiber network diagram style template, and a valve control optical fiber network diagram style template.

[0076] In a preferred embodiment, the secondary circuit monitoring system is connected to the SCADA network of the converter station safety zone 1, deployed independently or in combination with the station monitoring system, and communicates with the DC control and protection host in an online manner.

[0077] In a preferred embodiment, the loop monitoring service module obtains the secondary loop status from the SCADA system specifically including: for point-to-point communication mode, the optical fiber communication alarm signal of the DC control and protection host is used to represent the secondary loop status; for network communication mode, the optical fiber receiving and sending data alarm signal of the DC control and protection host is used to represent the secondary loop status after "AND operation"; when all receiving and sending data of the optical fiber communication port generate error alarms, the port status is interrupted; if only some error alarms are generated, the port status is abnormal; when there are no error alarms for receiving and sending data of the optical fiber communication port, the port status is normal.

[0078] In a preferred embodiment, the loop monitoring service module further obtains secondary loop information from the SCADA system at a preset frequency.

[0079] During system initialization, the secondary circuit monitoring system in this application automatically sends a SER event status general query command to the front-end module via the SCADA module. The front-end module obtains current status information from the DC control and protection host and sends it to the SCADA system. The SCADA system extracts event information related to the secondary circuit from the SER event information, generates the initial status of the secondary circuit, and stores it in the SCADA database.

[0080] When the system is operating normally, the loop monitoring service module will obtain the current status of the secondary loop from the SCADA library and send it to the screen monitoring module to complete real-time monitoring of the secondary loop status.

[0081] When the DC control and protection host computer experiences an abnormal state, it proactively sends a SER event to the system's front-end module. The SCADA module receives this information from the front-end module, extracts information related to the secondary circuit, and updates the SCADA library. The circuit monitoring module refreshes the circuit status on the monitoring screen based on the latest status.

[0082] When a circuit fault occurs, an alarm will be issued in time, and the location of the fault circuit will be displayed visually on the monitoring screen.

[0083] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only intended to help understand the method and core ideas of the present application. At the same time, changes or modifications made by those skilled in the art based on the ideas of the present application, the specific implementation methods, and the scope of application of the present application, all fall within the scope of protection of the present application. In summary, the contents of this specification should not be construed as limiting the present application.

Claims

1. A method for visually monitoring the secondary circuit of a DC control and protection system of a converter station, characterized in that: include: Set the physical contact diagram style template; Obtain SER event information from the DC control and protection host, extract event information related to the secondary circuit from the SER event information to generate secondary circuit status information, and store it in the SCADA system; Based on the primary equipment model architecture of the converter station and the optical fiber network of the DC control and protection host, the physical connection diagram style template is instantiated to generate a monitoring screen; Establish the association between the secondary circuit status information data object of the SCADA system and the monitoring screen graphic element; When the status of the DC control and protection host changes, it actively sends SER event information; extracts event information related to the secondary circuit to generate secondary circuit status information, and updates the SCADA system; Refresh the secondary circuit status of the monitoring screen according to the updated SCADA system; The secondary circuit status is monitored in real time, an alarm is issued in time when a circuit fault occurs, and the location of the fault circuit is visually displayed on the monitoring screen.

2. A method for visually monitoring the secondary circuit of a DC control and protection system of a converter station according to claim 1, characterized in that: The event information related to the secondary circuit includes: information related to the optical fiber circuit between the DC control host, the DC protection host, the protection three-out-of-two device, the merging unit, the intelligent IO and the switch equipment.

3. A method for visually monitoring the secondary circuit of a DC control and protection system of a converter station according to claim 1, characterized in that: The physical contact diagram style templates include: a pole protection optical fiber network diagram style template, a pole control optical fiber network diagram style template, a valve protection optical fiber network diagram style template and a valve control optical fiber network diagram style template.

4. A method for visually monitoring the secondary circuit of a DC control and protection system of a converter station according to claim 1, characterized in that: The process of obtaining SER event information of the DC control and protection host, extracting event information related to the secondary circuit from the SER event information, generating secondary circuit status information, and storing the information in the SCADA system specifically includes: Connect to the DC control and protection host through the converter station SCADA network; After the communication connection is established, the SER event information of the DC control and protection host can be obtained through the general query call; Extracting event information related to the secondary circuit from SER event information; Secondary circuit status information is generated based on event information related to the secondary circuit, and the secondary circuit status information is stored in the database of the SCADA system.

5. The method for visually monitoring the secondary circuit of the DC control and protection system of a converter station according to claim 1 is characterized in that: The secondary circuit status specifically includes: for point-to-point communication mode, the secondary circuit status is represented by the optical fiber communication alarm signal of the DC control and protection host; for network communication mode, the secondary circuit status is represented by the "AND operation" of the optical fiber receiving and sending data alarm signals of the DC control and protection host; when all receiving and sending data of the optical fiber communication port generate error alarms, the port status is interrupted; if only some error alarms are generated, the port status is abnormal; when there are no error alarms for receiving and sending data of the optical fiber communication port, the port status is normal.

6. A method for visually monitoring the secondary circuit of a DC control and protection system of a converter station according to claim 1, characterized in that: The method further includes: acquiring secondary circuit information from a SCADA system at a preset frequency to refresh the secondary circuit status on a monitoring screen.

7. A visual monitoring system for the secondary circuit of a DC control and protection system of a converter station, characterized in that: include: Style template module, screen editing module, screen monitoring module, loop monitoring service module and front-end module; The style template module is used to set the physical contact diagram style template; The screen editing module instantiates the physical connection diagram template based on the primary equipment model architecture of the converter station and the optical fiber network of the DC control and protection host, generates a monitoring screen, and saves it in the screen monitoring module; The front-end module is used to obtain SER event information of the DC control and protection host and receive SER event information actively sent when the relevant status of the DC control and protection host changes, and send it to the SCADA system; the SCADA system extracts event information related to the secondary circuit from the SER event information to generate secondary circuit status information and stores it in the SCADA system; The loop monitoring service module is used to obtain the secondary loop status from the SCADA system and send it to the screen monitoring module; it monitors the secondary loop status in real time, and promptly issues an alarm when a loop fault occurs, and sends it to the screen monitoring module; The screen monitoring module is used to associate the secondary circuit status with the monitoring screen graphic elements and visually display the secondary circuit status on the monitoring screen.

8. The visual monitoring system for the secondary circuit of the DC control and protection system of a converter station according to claim 7 is characterized in that: The physical contact diagram style templates include: a pole protection optical fiber network diagram style template, a pole control optical fiber network diagram style template, a valve protection optical fiber network diagram style template and a valve control optical fiber network diagram style template.

9. The visual monitoring system for the secondary circuit of the DC control and protection system of a converter station according to claim 7 is characterized in that: The secondary circuit visual monitoring system is connected to the SCADA network of the converter station safety zone 1, and is deployed independently or in combination with the station monitoring system, and communicates with the DC control and protection host in an online manner.

10. The secondary circuit visual monitoring system of the DC control and protection system of a converter station according to claim 7, characterized in that: The loop monitoring service module obtains the secondary loop status from the SCADA system in the following specific ways: for point-to-point communication, the secondary loop status is indicated by the optical fiber communication alarm signal of the DC control and protection host; for network communication, the secondary loop status is indicated by the "AND operation" of the optical fiber receiving and sending data alarm signal of the DC control and protection host; when all received and sent data of the optical fiber communication port generate error alarms, the port status is interrupted; if only some error alarms are generated, the port status is abnormal; when there are no error alarms for received and sent data of the optical fiber communication port, the port status is normal.

11. The secondary circuit visual monitoring system of the DC control and protection system of a converter station according to claim 7, characterized in that: The loop monitoring service module also obtains secondary loop information from the SCADA system at a preset frequency.

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