Method and device for restarting distributed series compensator

Abstract

The invention provides a restarting method and device of a distributed series compensator. Under the condition that a power transmission line breaks down, the distributed series compensator can be controlled to be locked, and then under the condition that the fault can be automatically eliminated within a preset first time period, a first control instruction is sent to control a subunit of a valve layer to carry out hot restarting, and a second control instruction is sent to control the subunit of the valve layer to carry out cold restarting. According to the invention, the restarting of the distributed series compensator is realized in a hot restarting or cold restarting manner. The application not only can improve the use efficiency of the distributed series compensator, but also can improve the stability of the power transmission line. According to the invention, the number of times of sending the second control instruction in the third time period is limited, the non-stop restarting of the distributed series compensator after the permanent fault of the power transmission line is avoided, the restarting of the distributed series compensator is realized, and the reliability of the distributed series compensator is also improved.

Description

Technical Field

[0001] The present application relates to the technical field of power flow control, and in particular to a method and device for re-commissioning a distributed series compensator. Background Art

[0002] As AC power grids expand in size and complexity, distributed series compensators (DSSCs), such as distributed static synchronous distributed series compensators (DSSCs), are increasingly being used in transmission lines for power flow control. These DSSCs can be directly connected to transmission lines via internal voltage source converters to adjust the line's impedance, thereby achieving power flow control in the AC grid. These DSSCs can optimize power flow distribution in AC grids, making it more balanced and improving the transmission capacity of transmission lines. They play a significant role in stabilizing power quality and enhancing transmission reliability.

[0003] However, in the event of a transmission line fault, the DSC cannot function properly and must be coordinated with the transmission line to eliminate the fault. Related technologies typically shut down the DSC, which in practical applications not only reduces the DSC's efficiency but also degrades the stability of the transmission line. Summary of the Invention

[0004] In order to solve the problems of low stability of transmission lines and low efficiency of distributed series compensators in the prior art, the present application provides a method and device for re-commissioning a distributed series compensator.

[0005] In a first aspect, the present application provides a method for re-commissioning a distributed series compensator, which may include:

[0006] In the event of a fault in a transmission line to which the distributed series compensator is connected, the distributed series compensator is controlled to be locked.

[0007] If the fault is automatically eliminated within a preset first time period, a first control instruction is sent to the valve layer subunit. The first control instruction is used to instruct the distributed series compensator to switch from a hot standby state to a normal operating state. The hot standby state indicates that the bypass switch in the distributed series compensator is disconnected and the converter in the valve layer subunit is locked.

[0008] If the fault cannot be automatically eliminated within the preset first time period, a second control instruction is sent to the valve layer subunit. The second control instruction is used to control the distributed series compensator to switch from a cold standby state to a normal operating state. The cold standby state indicates that the bypass switch is closed and the converter is locked.

[0009] It is understood that sending the first control instruction to the valve layer subunit is a process of controlling the valve layer subunit to perform hot re-commissioning, thereby achieving re-commissioning of the distributed series compensator. It is also understood that sending the second control instruction to the valve layer subunit is a process of controlling the valve layer subunit to perform cold re-commissioning, thereby achieving re-commissioning of the distributed series compensator.

[0010] In some possible implementations, sending the first control instruction to the valve layer subunit includes:

[0011] If the distributed series compensator fails to successfully switch from the hot standby state to the normal state within the preset second time period, a second control instruction is sent to the valve layer subunit.

[0012] In some other possible implementations, sending the second control instruction to the valve layer subunit includes:

[0013] Control the bypass switch to disconnect and control the valve layer subunit to charge.

[0014] During the preset third time period, the second control instruction is sent to the valve layer subunit at preset time intervals.

[0015] If the distributed series compensator fails to successfully switch from the cold standby state to the normal operating state within the preset fourth time period, and the number of times the second control instruction is sent within the third time period does not reach the preset number, the second control instruction is resent to the valve layer subunit.

[0016] Optionally, the second time period may be shorter than the fourth time period.

[0017] In some other possible implementations, the reinvestment method further includes:

[0018] If the fault cannot be automatically eliminated within the preset first time period, a third control instruction is sent to the bypass switch, wherein the third control instruction is used to instruct the bypass switch to disconnect.

[0019] In some further possible implementations, the reinvestment method further includes:

[0020] The current of the transmission line is obtained. If the current of the transmission line exceeds a preset current threshold, it is determined that a fault has occurred in the transmission line.

[0021] In a second aspect, the present application provides a distributed series compensator re-entry device, which may include:

[0022] The control module is used to control the distributed series compensator to be locked when a transmission line to which the distributed series compensator is connected fails.

[0023] The first sending module is configured to send a first control instruction to the valve layer subunit if the fault is automatically eliminated within a preset first time period. The first control instruction is configured to instruct the distributed series compensator to switch from a hot standby state to a normal operating state. The hot standby state indicates that a bypass switch in the distributed series compensator is disconnected and a converter in the valve layer subunit is locked.

[0024] The second sending module is configured to send a second control instruction to the valve layer subunit if the fault cannot be automatically eliminated within a preset first time period. The second control instruction is configured to instruct the distributed series compensator to switch from a cold standby state to a normal operating state. The cold standby state indicates that the bypass switch is closed and the converter is locked.

[0025] In some possible implementations, the first sending module is specifically configured to:

[0026] If the distributed series compensator fails to successfully switch from the hot standby state to the normal state within the preset second time period, a second control instruction is sent to the valve layer subunit.

[0027] In some other possible implementations, the second sending module is specifically configured to:

[0028] Control the bypass switch to disconnect and control the valve layer subunit to charge.

[0029] During the preset third time period, the second control instruction is sent to the valve layer subunit at preset time intervals.

[0030] If the distributed series compensator fails to successfully switch from the cold standby state to the normal operating state within the preset fourth time period, and the number of times the second control instruction is sent within the third time period does not reach the preset number, the second control instruction is resent to the valve layer subunit.

[0031] Optionally, the second time period is shorter than the fourth time period.

[0032] In some further possible implementations, the second sending module is further configured to:

[0033] If the fault cannot be automatically eliminated within the preset first time period, a third control instruction is sent to the bypass switch, wherein the third control instruction is used to instruct the bypass switch to disconnect.

[0034] In some further possible implementations, the re-investment device further includes a judgment module, which is configured to:

[0035] Get the current of the transmission line.

[0036] If the current of the transmission line exceeds a preset current threshold, it is determined that a fault has occurred in the transmission line.

[0037] On the other hand, the present application also provides a computer device, including: one or more processors.

[0038] A processor is used to execute one or more programs.

[0039] When one or more programs are executed by one or more processors, the reinvestment method described above is implemented.

[0040] In another aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the above-mentioned reinvestment method.

[0041] Compared with the prior art, the present invention has the following advantages:

[0042] In the distributed series compensator recommissioning method provided in the present application, in the event of a fault in the transmission line to which the distributed series compensator is connected, the distributed series compensator can be controlled to lock out. Furthermore, if the fault is automatically eliminated within a preset first time period, a first control instruction is sent to control the valve layer subunit to perform a hot recommissioning, and a second control instruction is sent to control the valve layer subunit to perform a cold recommissioning. It can be seen that the present application achieves the recommissioning of the distributed series compensator through hot recommissioning or cold recommissioning. Compared with the related art method of directly shutting down the distributed series compensator, the technical solution provided in the present application can not only improve the utilization efficiency of the distributed series compensator, but also improve the stability of the transmission line.

[0043] In the technical solution provided by this application, if the distributed series compensator fails to successfully switch from cold standby to normal operation within a preset fourth time period, and the number of second control instructions sent within the third time period does not reach a preset number, the second control instruction is resent to the valve layer subunit. In other words, this application limits the number of second control instructions sent within the third time period (also understood as the number of cold re-starts), preventing the distributed series compensator from endlessly re-starting after a permanent transmission line fault. This not only enables the re-start of the distributed series compensator but also improves its reliability.

[0044] The re-commissioning method provided in this application can enable the valve layer subunit of the distributed series compensator to respond quickly and resume normal operation, ensuring that the AC power grid where the distributed series compensator is located can operate efficiently and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0046] Figure 1 A schematic structural diagram of a distributed series compensator in an embodiment of the present application;

[0047] Figure 2 This is a schematic flow chart of the re-investment method in the embodiment of the present application;

[0048] Figure 3 1 is a schematic flow chart of the reinvestment method in an embodiment of the present application;

[0049] Figure 4 1 is a schematic structural diagram of a re-projection device in an embodiment of the present application;

[0050] Figure 5 This is another schematic structural diagram of the re-projection device in an embodiment of the present application. DETAILED DESCRIPTION

[0051] The technical solution in this application will be described below with reference to the accompanying drawings.

[0052] The terms "first," "second," and the like in the description, embodiments, claims, and drawings of this application are used solely for descriptive purposes and are not to be construed as indicating or implying relative importance or order. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions, such as, for example, inclusion of a series of steps or units. A method, system, product, or apparatus is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0053] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0054] Example 1:

[0055] The embodiment of the present application provides a method for re-commissioning a distributed series compensator. Figure 1As shown, the distributed series compensator 10 may include a re-energizing device 1 and a valve layer subunit 2. Of course, the distributed series compensator 10 may also include a bypass switch for energizing the valve layer subunit 2 when disconnected. The re-energizing device 1 may control the valve layer subunit 2 according to control instructions. The valve layer subunit 2 may include primary equipment such as a converter, and may also include a secondary system, which will not be described in detail in this embodiment of the application.

[0056] like Figure 2 As shown, the reinvestment method 100 includes the following steps:

[0057] Step S1: When a transmission line to which a distributed series compensator is connected fails, the distributed series compensator is controlled to be locked.

[0058] Step S2: If the fault is automatically eliminated within a preset first time period (which may be 1 second, for example), a first control instruction is sent to the valve layer subunit. The first control instruction is used to instruct the distributed series compensator to switch from a hot standby state to a normal operating state. The hot standby state indicates that the bypass switch in the distributed series compensator is disconnected and the converter is locked.

[0059] Step S3: If the fault cannot be automatically eliminated within the preset first time period, a second control instruction is sent to the valve layer subunit. The second control instruction is used to control the distributed series compensator to switch from the cold standby state to the normal operating state. The cold standby state indicates that the bypass switch is closed and the converter is locked.

[0060] It should be noted that the embodiment of the present application does not limit the specific execution order of each step, as long as the re-commissioning of the distributed series compensator can be achieved.

[0061] It is understood that sending the first control instruction to the valve layer subunit in step S2 is the process of controlling the valve layer subunit to perform thermal re-commissioning, thereby achieving re-commissioning of the distributed series compensator. It is also understood that sending the second control instruction to the valve layer subunit in step S3 is the process of controlling the valve layer subunit to perform thermal re-commissioning, thereby achieving re-commissioning of the distributed series compensator.

[0062] In some possible implementations, sending the first control instruction to the valve layer subunit in step S2 includes:

[0063] refer to Figure 3 If the distributed series compensator fails to successfully switch from the hot standby state to the normal state within a preset second time period (which can be 1 minute, etc.), a second control instruction is sent to the valve layer subunit.

[0064] In some other possible implementations, sending the second control instruction to the valve layer subunit in step S3 includes:

[0065] refer to Figure 3 , control the bypass switch to be disconnected, and control the valve layer subunit to be charged. Within a preset third time period (the third time period can be 24 hours, etc.), send a second control instruction to the valve layer subunit at a preset time interval (which can be 4 hours, etc.). If the distributed series compensator fails to successfully switch from the cold standby state to the normal operating state within a preset fourth time period (the second time period is shorter than the fourth time period, and the fourth time period can be 3 minutes, etc.), and the number of times the second control instruction is sent within the third time period does not reach a preset number (which can be 6 times a day, etc.), then resend the second control instruction to the valve layer subunit.

[0066] In some further possible implementations, the reinvestment method 100 further includes:

[0067] In the case that the fault cannot be automatically eliminated within the preset first time period, a third control instruction is sent to the disconnector, and a fourth control instruction is sent to the bypass switch.

[0068] The third control instruction is used to instruct the disconnector to close, and the fourth control instruction is used to instruct the bypass switch to open.

[0069] In some further possible implementations, the reinvestment method further includes:

[0070] refer to Figure 3 , obtain the current of the transmission line. If the current of the transmission line exceeds a preset current threshold, it is determined that a fault has occurred in the transmission line.

[0071] Example 2:

[0072] Based on the same inventive concept, the present embodiment also provides a distributed series compensator re-entry device. Figure 1 , the embodiments of this application will not be described in detail here.

[0073] like Figure 4 As shown, the re-projection device 200 may include:

[0074] The control module 201 is configured to control the distributed series compensator to be locked when a transmission line to which the distributed series compensator is connected fails.

[0075] The first sending module 202 is configured to send a first control instruction to the valve layer subunit if the fault is automatically eliminated within a preset first time period. The first control instruction is configured to instruct the distributed series compensator to switch from a hot standby state to a normal operating state. The hot standby state indicates that the bypass switch in the distributed series compensator is disconnected and the converter is locked.

[0076] The second sending module 202 is configured to send a second control instruction to the valve layer subunit if the fault cannot be automatically eliminated within a preset first time period. The second control instruction is configured to instruct the distributed series compensator to switch from a cold standby state to a normal operating state. The cold standby state indicates that the bypass switch is closed and the converter is locked.

[0077] In some possible implementations, the first sending module 202 is specifically configured to:

[0078] If the distributed series compensator fails to successfully switch from the hot standby state to the normal state within the preset second time period, a second control instruction is sent to the valve layer subunit.

[0079] In some other possible implementations, the second sending module 203 is specifically configured to:

[0080] The bypass switch is controlled to be disconnected, and the valve layer subunit is controlled to be charged. Within a preset third time period, a second control instruction is sent to the valve layer subunit at a preset time interval. If the distributed series compensator fails to successfully switch from the cold standby state to the normal operating state within a preset fourth time period (the second time period may be shorter than the fourth time period), and the number of times the second control instruction is sent within the third time period does not reach a preset number, the second control instruction is resent to the valve layer subunit.

[0081] In some further possible implementations, the second sending module 203 is further configured to:

[0082] If the fault cannot be automatically eliminated within the preset first time period, a third control instruction is sent to the bypass switch, wherein the third control instruction is used to instruct the bypass switch to disconnect.

[0083] In some other possible implementations, such as Figure 5 As shown, the re-powering device 100 further includes a judgment module 204. The judgment module 204 is used to obtain the current of the power transmission line and determine that a power transmission line fault occurs if the current of the power transmission line exceeds a preset current threshold.

[0084] Example 3:

[0085] Based on the same inventive concept, an embodiment of the present application further provides a computer device, which includes a processor and a memory, the memory being used to store a computer program, the computer program including program instructions, and the processor being used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the re-projection method provided in the above embodiment.

[0086] Example 4:

[0087] Based on the same inventive concept, an embodiment of the present application also provides a computer-readable storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space that stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space. These instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the reinvestment method provided in the above embodiment.

[0088] Those skilled in the art will appreciate that embodiments of the application may be provided as methods, systems, or computer program products. Thus, the application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0089] The application is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as a combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0090] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0091] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0092] The above are merely embodiments of the application and are not intended to limit the application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the application are included in the scope of the claims of the pending application.

Claims

1. A method for re-commissioning a distributed series compensator, characterized in that: include: When a transmission line to which a distributed series compensator is connected fails, controlling the distributed series compensator to be locked; If the fault can be automatically eliminated within a preset first time period, a first control instruction is sent to the valve layer subunit; the first control instruction is used to instruct the distributed series compensator to switch from a hot standby state to a normal operating state; wherein the hot standby state is used to instruct the bypass switch in the distributed series compensator to be disconnected and the converter in the valve layer subunit to be locked; In the case that the fault cannot be automatically eliminated within the preset first time period, a second control instruction is sent to the valve layer subunit; the second control instruction is used to instruct the distributed series compensator to switch from the cold standby state to the normal operating state; wherein, the cold standby state is used to indicate that the bypass switch is closed and the converter is locked.

2. The reinvestment method according to claim 1, characterized in that: The sending of the first control instruction to the valve layer subunit includes: If the distributed series compensator fails to successfully switch from the hot standby state to the normal state within a preset second time period, a second control instruction is sent to the valve layer subunit.

3. The re-investment method according to claim 2, characterized in that: The sending of the second control instruction to the valve layer subunit includes: Controlling the bypass switch to be disconnected, and controlling the valve layer subunit to be charged; During a preset third time period, sending the second control instruction to the valve layer subunit at preset time intervals; If the distributed series compensator fails to successfully switch from the cold standby state to the normal operating state within the preset fourth time period, and the number of times the second control instruction is sent within the third time period does not reach the preset number, the second control instruction is resent to the valve layer subunit.

4. The re-investment method according to claim 3, characterized in that: The second period is shorter than the fourth period.

5. The re-investment method according to claim 1, characterized in that: The distributed series compensator re-commissioning method further includes: In the case that the fault cannot be automatically eliminated within the preset first time period, a third control instruction is sent to the bypass switch; wherein the third control instruction is used to instruct the bypass switch to disconnect.

6. The re-investment method according to claim 1, characterized in that: The distributed series compensator re-commissioning method further includes: obtaining the current of the transmission line; If the current of the power transmission line exceeds a preset current threshold, it is determined that the fault occurs in the power transmission line.

7. A distributed series compensator re-commissioning device, characterized in that: include: a control module, configured to control the distributed series compensator to be locked when a transmission line to which the distributed series compensator is connected fails; A first sending module is configured to send a first control instruction to the valve layer subunit when the fault can be automatically eliminated within a preset first time period; the first control instruction is configured to instruct the distributed series compensator to switch from a hot standby state to a normal operating state; wherein the hot standby state is configured to instruct the bypass switch in the distributed series compensator to be disconnected and the converter in the valve layer subunit to be locked; The second sending module is used to send a second control instruction to the valve layer subunit when the fault cannot be automatically eliminated within the preset first time period; the second control instruction is used to instruct the distributed series compensator to switch from the cold standby state to the normal operating state; wherein, the cold standby state is used to indicate that the bypass switch is closed and the converter is locked.

8. The re-delivery device according to claim 7, characterized in that: The first sending module is specifically configured to: If the distributed series compensator fails to successfully switch from the hot standby state to the normal state within a preset second time period, a second control instruction is sent to the valve layer subunit.

9. The re-delivery device according to claim 8, characterized in that: The second sending module is specifically configured to: Controlling the bypass switch to be disconnected, and controlling the valve layer subunit to be charged; During a preset third time period, sending the second control instruction to the valve layer subunit at preset time intervals; If the distributed series compensator fails to successfully switch from the cold standby state to the normal operating state within the preset fourth time period, and the number of times the second control instruction is sent within the third time period does not reach the preset number, the second control instruction is resent to the valve layer subunit.

10. The re-delivery device according to claim 9, characterized in that: The second period is shorter than the fourth period.

11. The re-delivery device according to claim 7, characterized in that: The second sending module is further configured to: In the case that the fault cannot be automatically eliminated within the preset first time period, a third control instruction is sent to the bypass switch; wherein the third control instruction is used to instruct the bypass switch to disconnect.

12. The re-delivery device according to claim 7, characterized in that: The re-projection device further includes a judgment module, which is configured to: obtaining the current of the transmission line; If the current of the power transmission line exceeds a preset current threshold, it is determined that the fault occurs in the power transmission line.

13. A computer device, characterized in that: include: one or more processors; The processor is configured to store one or more programs; When the one or more programs are executed by the one or more processors, the reinvestment method according to any one of claims 1 to 6 is implemented.

14. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed, the reinvestment method according to any one of claims 1 to 6 is implemented.

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