Power transmission system protection methods, devices, computer equipment, media, and products

Abstract

This application relates to a method, apparatus, computer equipment, medium, and product for protecting a power transmission system. The method includes: acquiring the position signals of a bypass breaker and a bypass disconnector, wherein both the position signals of the bypass breaker and the bypass disconnector include one of a closed position signal and an open position signal; acquiring a first current value on the bypass breaker, acquiring a second current value on the neutral bus, and acquiring a third current value on the positive bus; and determining whether to control the bypass breaker to close to protect the power transmission system based on the position signals of the bypass breaker, the bypass disconnector, the first current value, the second current value, and the third current value. Thus, through verification under the above multiple conditions, the closing status of the bypass switch can be accurately controlled, avoiding malfunctions of the bypass switch and improving the reliability of the power transmission system.

Description

Technical Field

[0001] This application relates to the field of power transmission technology, and in particular to a power transmission system protection method, device, computer equipment, medium, and product. Background Technology

[0002] With the development of power transmission technology, ultra-high voltage direct current (UHVDC) transmission technology has been widely used due to its advantages such as large transmission capacity, high voltage level, and low cost. Current UHVDC transmission technologies all employ a series connection of multiple converter valve groups. The operating mode of the transmission system is adjusted by controlling the opening and closing of the bypass circuit breakers corresponding to each converter valve group. However, malfunction of the bypass circuit breakers can pose a risk to the transmission system. Therefore, how to control the bypass circuit breakers and thus improve the reliability of the transmission system is a problem that needs to be solved. Summary of the Invention

[0003] Therefore, it is necessary to provide a power transmission system protection method, device, computer equipment, medium, or product that can improve the reliability of power transmission systems in response to the above-mentioned technical problems.

[0004] A power transmission system protection method, characterized in that the power transmission system includes multiple converter stations, each converter station including: two converter valve groups connected in series, a bypass circuit breaker connected in parallel with each converter valve group, and a bypass isolating switch connected in parallel with each converter valve group, wherein a first end of the converter station is connected to the neutral bus and a second end is connected to the positive bus.

[0005] The method includes: acquiring the position signal of the bypass circuit breaker and the position signal of the bypass disconnect switch, wherein both the position signal of the bypass circuit breaker and the position signal of the bypass disconnect switch include one of a closed position signal and an open position signal; acquiring a first current value on the bypass circuit breaker, acquiring a second current value on the neutral bus, and acquiring a third current value on the positive bus; and determining whether to control the bypass circuit breaker to close to protect the power transmission system based on the position signal of the bypass circuit breaker, the position signal of the bypass disconnect switch, the first current value, the second current value, and the third current value.

[0006] In one embodiment, determining whether to control the bypass circuit breaker to close to protect the power transmission system based on the position signal of the bypass circuit breaker, the position signal of the bypass disconnector, the first current value, the second current value, and the third current value includes: determining the difference between the larger of the second current value and the third current value and the first current value; continuously acquiring the position signal of the bypass circuit breaker and determining the disconnection time when the position signal of the bypass circuit breaker changes from a closed position signal to an open position signal; and determining whether to control the bypass circuit breaker to close to protect the power transmission system based on the position signal of the bypass disconnector, the first current value, and the difference within a first set time period from the disconnection time.

[0007] In one embodiment, determining whether to control the bypass circuit breaker to close to protect the power transmission system based on the position signal of the bypass disconnector, the first current value, and the difference within a first set time period from the disconnection time includes: within the first set time period from the disconnection time, if the position signal of the bypass disconnector is an open position signal, the first current value is greater than a current threshold and lasts for a second set time period, and the difference is greater than or equal to zero, then controlling the bypass circuit breaker to close, wherein the first set time period is greater than or equal to the second set time period.

[0008] In one embodiment, the plurality of converter stations include rectifier stations and inverter stations, and the method of claim 1 is applied to the rectifier stations and the inverter stations.

[0009] In one embodiment, the two series-connected converter valve groups include a high-end valve group connected to the positive bus and a low-end valve group connected to the neutral bus, and the method of claim 1 is applied to the high-end valve group and the low-end valve group.

[0010] In one embodiment, the current threshold is 60%-80% of the rated current value of the converter station.

[0011] A power transmission system protection device, characterized in that the power transmission system includes multiple converter stations, each converter station including: two converter valve groups connected in series, a bypass circuit breaker connected in parallel with each converter valve group, and a bypass isolating switch connected in parallel with each converter valve group, wherein a first end of the converter station is connected to the neutral bus and a second end is connected to the positive bus.

[0012] The device includes:

[0013] The signal acquisition module is used to acquire the position signal of the bypass circuit breaker and the position signal of the bypass disconnect switch, wherein the position signal of the bypass circuit breaker and the position signal of the bypass disconnect switch both include one of a closed position signal and an open position signal;

[0014] The current acquisition module is used to acquire the first current value on the bypass circuit breaker, the second current value on the neutral bus, and the third current value on the positive bus.

[0015] The control module is used to determine whether to control the bypass circuit breaker to close in order to protect the power transmission system based on the position signal of the bypass circuit breaker, the position signal of the bypass isolating switch, the first current value, the second current value, and the third current value.

[0016] A computer device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to perform the following steps: acquiring the position signal of a bypass circuit breaker and the position signal of a bypass disconnect switch, wherein both the position signal of the bypass circuit breaker and the position signal of the bypass disconnect switch include one of a closed position signal and an open position signal; acquiring a first current value on the bypass circuit breaker, acquiring a second current value on the neutral bus, and acquiring a third current value on the positive bus; and determining whether to control the bypass circuit breaker to close to protect the power transmission system based on the position signal of the bypass circuit breaker, the position signal of the bypass disconnect switch, the first current value, the second current value, and the third current value.

[0017] A computer-readable storage medium storing a computer program thereon, the computer program being executed by a processor to perform the following steps: acquiring the position signal of the bypass circuit breaker and the position signal of the bypass disconnect switch, wherein both the position signal of the bypass circuit breaker and the position signal of the bypass disconnect switch include one of a closed position signal and an open position signal; acquiring a first current value on the bypass circuit breaker, acquiring a second current value on the neutral bus, and acquiring a third current value on the positive bus; and determining whether to control the bypass circuit breaker to close to protect the power transmission system based on the position signal of the bypass circuit breaker, the position signal of the bypass disconnect switch, the first current value, the second current value, and the third current value.

[0018] A computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps: acquiring the position signal of the bypass circuit breaker and the position signal of the bypass disconnect switch, wherein both the position signal of the bypass circuit breaker and the position signal of the bypass disconnect switch include one of a closed position signal and an open position signal; acquiring a first current value on the bypass circuit breaker, acquiring a second current value on the neutral bus, and acquiring a third current value on the positive bus; and determining whether to control the bypass circuit breaker to close to protect the power transmission system based on the position signal of the bypass circuit breaker, the position signal of the bypass disconnect switch, the first current value, the second current value, and the third current value.

[0019] The aforementioned power transmission system protection methods, devices, computer equipment, media, and products. The power transmission system includes multiple converter stations, each comprising: two converter valve groups connected in series; a bypass circuit breaker connected in parallel, corresponding to each converter valve group; and a bypass disconnect switch connected in parallel, also corresponding to each converter valve group. The first end of the converter station is connected to the neutral bus, and the second end is connected to the positive bus. By acquiring the position signals of the bypass circuit breaker and the bypass disconnect switch, the open or closed status of the bypass circuit breaker and the bypass disconnect switch can be determined, thereby enabling monitoring of the opening and closing status of the bypass circuit breaker and facilitating the determination of how to control the bypass circuit breaker based on its status. Then, the first current value on the bypass circuit breaker, the second current value on the neutral bus, and the third current value on the positive bus are acquired, thus obtaining various parameters in the power transmission system. Then, based on the position signals of the bypass circuit breaker and the bypass disconnector, as well as the first, second, and third current values, a comprehensive judgment is made as to whether to control the bypass circuit breaker to close. Since the first current value is the current value on the bypass circuit breaker, it can be used to determine if the bypass circuit breaker has been damaged. The second and third current values ​​are the current values ​​on the busbar, and can be used to determine if the current on the bypass circuit breaker is normal. The opening and closing status of the bypass circuit breaker and the bypass disconnector can be used to determine whether it is necessary to control the bypass disconnector to close. Therefore, through the verification of these multiple conditions, the closing status of the bypass circuit breaker can be accurately controlled, avoiding malfunctions and improving the reliability of the power transmission system. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the power transmission system in one embodiment;

[0022] Figure 2 Here is a flowchart of a power transmission system protection method in one embodiment;

[0023] Figure 3 A flowchart of a control method for a bypass circuit breaker in one embodiment;

[0024] Figure 4 This is a schematic diagram of the structure of a power transmission system protection device in one embodiment;

[0025] Figure 5 This is a control logic diagram of a power transmission system protection device in one embodiment;

[0026] Figure 6 This is an internal structural diagram of a computer device in one embodiment.

[0027] Explanation of reference numerals in the attached diagram: 10-Converter station, 11-Converter valve group, 12-Bypass circuit breaker, 13-Bypass disconnect switch, 100-Neutral bus, 200-Positive bus, 20-Rectifier station, 30-Inverter station, 40-Injection point. Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be more thorough and complete.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0030] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0031] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0032] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if there is an exchange of electrical signals or data between the connected objects.

[0033] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0034] In one embodiment, such as Figure 1 As shown, a power transmission system is provided, including multiple converter stations 10. Each converter station 10 includes: two converter valve groups 11 connected in series, a bypass circuit breaker 12 connected in parallel with each converter valve group 11, and a bypass isolating switch 13 connected in parallel with each converter valve group 11. The first end of the converter station 10 is connected to the neutral bus 100, and the second end is connected to the positive bus 200.

[0035] Specifically, the bypass circuit breaker 12 is used to control the connection and disconnection of the converter valve group 11 from the power transmission system. When the bypass circuit breaker 12 is closed, the corresponding converter valve group 11 disconnects from the power transmission system; when the bypass circuit breaker 12 is open, the corresponding converter valve group 11 connects to the power transmission system. The bypass disconnect switch 13 is used to control whether the converter valve group 11 is isolated. When closed, the converter valve group 11 is isolated.

[0036] Specifically, the multiple converter stations 10 include rectifier stations 20 and inverter stations 30. Figure 1The power transmission system includes one rectifier station 20 and two inverter stations 30. Rectifier station 20 uses an LCC (Line-commutated Converter) type converter valve group 11. Both inverter stations 30 use MMC (Modular Multilevel Converter) converter valve groups 11. The MMC converter valve group 11 is composed of a mixture of half-bridge sub-modules (HBSM) and full-bridge sub-modules (FBSM), with the ratio of full-bridge sub-modules to half-bridge sub-modules generally not less than 50%. Rectifier station 20 connects to the transmission cable and rectifies the electrical energy on the transmission cable before transmitting it to the positive bus 200, controlling the transmission power and current. Inverter stations 30 invert the electrical energy on the positive bus 200 and output it, controlling the voltage and power.

[0037] For example, Figure 1 Each converter station 10 is also equipped with a positive bus 200 disconnect switch Q9 and a neutral bus 100 disconnect switch Q7 to facilitate the isolation of the converter station 10 from the bus. Each converter valve group 11 is also equipped with an anode disconnect switch Q2 and a cathode disconnect switch Q1 to control the isolation of the converter valve group 11.

[0038] For example, Figure 1 Each converter station 10 in the series includes two series-connected converter valve groups 11, which include a high-end valve group connected to the positive bus 200 and a low-end valve group connected to the neutral bus 100.

[0039] It should be noted that the protection of the bypass circuit breaker in this application is due to the possibility that the bypass circuit breaker may open without receiving a disconnection command. In this case, since it is a high-voltage transmission system, even if the bypass circuit breaker is open, there is still current in the circuit. It's just that the air in the middle of the bypass circuit breaker is broken down. At this time, it is necessary to quickly identify the erroneous trip of the bypass circuit breaker and control the bypass circuit breaker to close quickly, so that the current in the circuit can still be transmitted through the bypass circuit breaker, thus preventing the circuit from being burned out.

[0040] like Figure 2 As shown, a power transmission system protection method is provided, applicable to various converter valve assemblies in the aforementioned power transmission system. The method includes:

[0041] Step S200: Obtain the position signal of the bypass circuit breaker and the position signal of the bypass isolating switch.

[0042] Specifically, the position signals of the bypass circuit breaker and the bypass isolating switch both include one of the following: a closed position signal and an open position signal.

[0043] Specifically, by acquiring the position signals of the bypass circuit breaker and the bypass disconnector, it is possible to determine whether the bypass circuit breaker and the bypass disconnector are open or closed, thereby enabling the monitoring of the opening and closing status of the bypass circuit breaker and facilitating the determination of how to control the bypass circuit breaker based on the opening and closing status of the bypass disconnector.

[0044] Step S220: Obtain the first current value on the bypass circuit breaker, obtain the second current value on the neutral bus, and obtain the third current value on the positive bus.

[0045] Specifically, the first current value is the current value on the bypass circuit breaker, so that it can be determined whether the bypass circuit breaker has been broken down. The second and third current values ​​are the current values ​​on the neutral bus and the positive bus, respectively, so that it can be determined whether the current on the bypass circuit breaker is normal.

[0046] Step S240: Based on the position signal of the bypass circuit breaker, the position signal of the bypass isolating switch, the first current value, the second current value, and the third current value, determine whether to control the bypass circuit breaker to close in order to protect the power transmission system.

[0047] In this embodiment, the power transmission system includes multiple converter stations. Each converter station includes: two converter valve groups connected in series, a bypass circuit breaker connected in parallel corresponding to each converter valve group, and a bypass disconnect switch connected in parallel corresponding to each converter valve group. The first end of the converter station is connected to the neutral bus, and the second end is connected to the positive bus. By acquiring the position signals of the bypass circuit breaker and the bypass disconnect switch, the open or closed status of the bypass circuit breaker and the bypass disconnect switch can be determined, thereby enabling monitoring of the opening and closing status of the bypass circuit breaker and facilitating the determination of how to control the bypass circuit breaker based on its status. Then, the first current value on the bypass circuit breaker, the second current value on the neutral bus, and the third current value on the positive bus are acquired, thereby obtaining various parameters in the power transmission system. Finally, based on the position signals of the bypass circuit breaker and the bypass disconnect switch, the first current value, the second current value, and the third current value, a comprehensive determination is made as to whether to control the bypass circuit breaker to close. Since the first current value is the current value on the bypass circuit breaker, it can be used to determine whether the bypass circuit breaker has broken down. The second and third current values ​​are the current values ​​on the busbar, and can be used to determine whether the current on the bypass circuit breaker is normal. The opening and closing status of the bypass circuit breaker and the bypass isolating switch can be used to determine whether it is necessary to control the closing of the bypass isolating switch. Therefore, through the verification of the above multiple conditions, the closing status of the bypass switch can be accurately controlled, avoiding malfunctions of the bypass switch and improving the reliability of the power transmission system.

[0048] In one embodiment, such as Figure 3 As shown, step S240, based on the position signal of the bypass circuit breaker, the position signal of the bypass isolating switch, the first current value, the second current value, and the third current value, determines whether to control the bypass circuit breaker to close to protect the power transmission system, including:

[0049] Step S300: Determine the difference between the larger of the second and third current values ​​and the first current value.

[0050] Specifically, the second and third current values ​​are the current values ​​on the neutral bus and positive bus, respectively, as shown in the figure. Figure 1 In the system shown, one of the second and third current values ​​will equal the current value on the bypass circuit breaker plus the other current value. Therefore, under normal circumstances, when there is no external current input, the larger of the second and third current values ​​will necessarily be greater than the first current value on the bypass circuit breaker. Thus, by determining the difference between the larger of the second and third current values ​​and the first current value, it can be determined whether there is an external current input to the system.

[0051] Step S320: Continuously acquire the position signal of the bypass circuit breaker and determine the disconnection time when the position signal of the bypass circuit breaker changes from a closed position signal to an open position signal.

[0052] Specifically, the position signal of the bypass circuit breaker is continuously acquired. The position signal includes a closed position signal and an open position signal. Based on the continuously acquired position signal, the moment when the position signal changes from a closed position signal to an open position signal can be determined.

[0053] Step S340: Based on the position signal of the bypass disconnecting switch, the first current value, and the difference within a first set time period from the disconnection time, determine whether to control the bypass circuit breaker to close in order to protect the power transmission system.

[0054] Specifically, within a first set time period from the moment of disconnection, the system determines whether to control the bypass circuit breaker to close based on the position signal of the bypass isolating switch, the first current value, and the difference. Setting a first set time period improves control accuracy and ensures timely control. If the time period is too short, relying solely on the above conditions to determine whether to control the bypass circuit breaker to close may result in a transient peak current momentarily meeting the conditions, but not actually fulfilling them; it could merely be a circuit fluctuation, leading to malfunction when attempting to close the bypass circuit breaker at that moment. Conversely, if the time period is too long, the excessive delay in controlling the bypass circuit breaker to close could cause it to break down and burn out. Therefore, setting a first set time period further improves system reliability.

[0055] For example, the first set duration can be 0.8s-1s.

[0056] In this embodiment, by setting the above-mentioned multiple conditions, it is possible to determine whether the bypass circuit breaker needs to be closed in a multi-dimensional and comprehensive manner, thereby accurately controlling the closing of the bypass circuit breaker, avoiding malfunction of the bypass circuit breaker, and improving the reliability of the system.

[0057] In one embodiment, step S340, determining whether to control the bypass circuit breaker to close to protect the power transmission system based on the position signal of the bypass isolating switch, the first current value, and the difference within a first set time period from the disconnection time, includes:

[0058] Step S400: Within a first set time period from the moment of disconnection, if the position signal of the bypass disconnector is a disconnection position signal, the first current value is greater than the current threshold and continues for a second set time period, and the difference is greater than or equal to zero, then control the bypass circuit breaker to close.

[0059] Specifically, the first set duration is greater than or equal to the second set duration to ensure the completeness and reliability of the judgment.

[0060] Specifically, controlling the closing of the bypass circuit breaker requires that the following three conditions be met simultaneously within a first set time period from the moment of disconnection:

[0061] 1. The position signal of the bypass disconnect switch is the open position signal, meaning the bypass disconnect switch is in the open state. (Refer to...) Figure 1 If the bypass disconnect switch is in the closed state, the current can pass through the bypass disconnect switch. Therefore, regardless of whether the bypass circuit breaker is closed or not, it will not cause damage to the circuit. Thus, there is no need to control the bypass circuit breaker at this time. Therefore, it is only necessary to control the bypass circuit breaker when the position signal of the bypass disconnect switch is the open position signal.

[0062] 2. The first current value is greater than the current threshold and persists for a second set duration. When the bypass circuit breaker is in the open state, the first current value on the bypass circuit breaker is detected. Under normal circumstances, when the bypass circuit breaker is open, the first current value on the bypass circuit breaker should be close to zero or very small. However, if the first current value is greater than the current threshold and persists for a second set duration, it means that the bypass circuit breaker has been broken down. At this time, it is necessary to control the bypass circuit breaker to close in order to avoid the circuit being burned out. Setting a second set duration can further ensure the accuracy of the judgment and avoid misjudgment due to transient current peaks.

[0063] For example, the current threshold is 60%-80% of the rated current value of the converter station.

[0064] For example, the second set duration can be 50ms-80ms.

[0065] 3. The difference between the larger of the second and third current values ​​and the first current value is greater than or equal to zero. The second and third current values ​​are the current values ​​on the neutral bus and positive bus, respectively. See below. Figure 1 In the system shown, one of the second and third current values ​​will equal the current value on the bypass switch plus the other current value. Therefore, under normal circumstances, when there is no external current input, the larger of the second and third current values ​​will necessarily be greater than the first current value on the bypass switch. Thus, by determining the difference between the larger of the second and third current values ​​and the first current value, it can be determined whether there is an external current input to the system. Figure 1Whether there is current input at injection point 40 is determined. When there is current input at injection point 40, the difference between the larger of the second and third current values ​​and the first current value will be less than zero. This indicates that the converter valve group is undergoing injection maintenance testing, and the bypass circuit breaker does not need to be controlled and will not respond to control, thus avoiding malfunction of the bypass circuit breaker. Specifically, when there is current input at injection point 40, the difference between the larger of the second and third current values ​​and the first current value is less than zero, which does not meet the condition that the difference between the larger of the second and third current values ​​and the first current value is greater than or equal to zero. Therefore, the bypass circuit breaker will not close. Thus, the bypass circuit breaker will not malfunction during maintenance injection.

[0066] In this embodiment, multiple conditions are set to determine whether to control the bypass circuit breaker to close, thereby ensuring that the bypass circuit breaker will not malfunction, improving the reliability of the bypass circuit breaker control, and thus improving the reliability of the power transmission system.

[0067] It should be understood that, although Figure 2 , 3 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order in which these steps are executed, and they can be performed in other orders. Furthermore, Figure 2 , 3 At least some of the steps in the process may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.

[0068] In one embodiment, such as Figure 4 As shown, a power transmission system protection device is provided, comprising: a signal acquisition module 401, a current acquisition module 402, and a control module 403, wherein:

[0069] The signal acquisition module 401 is used to acquire the position signal of the bypass circuit breaker and the position signal of the bypass disconnector. The position signal of the bypass circuit breaker and the position signal of the bypass disconnector both include one of the closed position signal and the open position signal.

[0070] The current acquisition module 402 is used to acquire the first current value on the bypass circuit breaker, the second current value on the neutral bus, and the third current value on the positive bus.

[0071] The control module 403 is used to determine whether to control the bypass circuit breaker to close in order to protect the power transmission system based on the position signal of the bypass circuit breaker, the position signal of the bypass isolating switch, the first current value, the second current value, and the third current value.

[0072] In one embodiment, the control module 403 includes: a difference determination unit, a time determination unit, and a protection unit, wherein:

[0073] The difference determination unit is used to determine the difference between the larger of the second current value and the third current value and the first current value.

[0074] The timing determination unit is used to continuously acquire the position signal of the bypass circuit breaker and determine the opening moment when the position signal of the bypass circuit breaker changes from a closed position signal to an open position signal.

[0075] The protection unit is used to determine whether to control the bypass circuit breaker to close in order to protect the power transmission system based on the position signal of the bypass disconnector, the first current value, and the difference value within a first set time period from the time of disconnection.

[0076] In one embodiment, the protection unit includes a protection subunit.

[0077] The protection subunit controls the bypass circuit breaker to close if, within a first set time period from the moment of disconnection, the position signal of the bypass isolating switch is a disconnected position signal, the first current value is greater than the current threshold and lasts for a second set time period, and the difference is greater than or equal to zero. The first set time period is greater than or equal to the second set time period.

[0078] For example, such as Figure 5 The diagram shown is the control logic diagram of the power transmission system protection device.

[0079] For example, the power transmission system protection device can be connected to multiple power transmission systems simultaneously and control multiple power transmission systems in accordance with the method described above.

[0080] Specific limitations regarding the power transmission system protection device can be found in the limitations of the power transmission system protection method described above, and will not be repeated here. Each module in the aforementioned power transmission system protection device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module. It should be noted that the module division in this embodiment is illustrative and only represents a logical functional division; other division methods may be used in actual implementation.

[0081] In one embodiment, a computer device is provided, the internal structure of which can be shown in the following diagram. Figure 6As shown, the computer device includes a processor, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage medium. The network interface is used to communicate with external terminals via a network connection. When the computer program is executed by the processor, it implements a power transmission system protection method.

[0082] Those skilled in the art will understand that Figure 6 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0083] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0084] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps in the above method embodiments.

[0085] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0086] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0087] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0088] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A power transmission system protection method, characterized in that, The power transmission system includes multiple converter stations. Each converter station includes: two converter valve groups connected in series, a bypass circuit breaker connected in parallel with each converter valve group, and a bypass isolating switch connected in parallel with each converter valve group. The first end of the converter station is connected to the neutral bus, and the second end is connected to the positive bus. The method includes: The position signals of the bypass circuit breaker and the bypass disconnect switch are obtained, wherein the position signals of the bypass circuit breaker and the bypass disconnect switch each include one of a closed position signal and an open position signal; Obtain the first current value on the bypass circuit breaker, obtain the second current value on the neutral bus, and obtain the third current value on the positive bus; Based on the position signal of the bypass circuit breaker, the position signal of the bypass isolating switch, the first current value, the second current value, and the third current value, determine whether to control the bypass circuit breaker to close to protect the power transmission system; The step of determining whether to control the bypass circuit breaker to close to protect the power transmission system based on the position signal of the bypass disconnect switch, the position signal of the bypass isolating switch, the first current value, the second current value, and the third current value includes: Determine the difference between the larger of the second current value and the third current value and the first current value; The position signal of the bypass circuit breaker is continuously acquired, and the disconnection time when the position signal of the bypass circuit breaker changes from a closed position signal to an open position signal is determined. Based on the position signal of the bypass disconnecting switch, the first current value, and the difference value within a first set time period from the disconnection time, it is determined whether to control the bypass circuit breaker to close to protect the power transmission system.

2. The method according to claim 1, characterized in that, The step of determining whether to control the bypass circuit breaker to close to protect the power transmission system based on the position signal of the bypass disconnecting switch, the first current value, and the difference value within a first set time period from the disconnection time includes: Within a first set duration from the moment of disconnection, if the position signal of the bypass disconnecting switch is a disconnected position signal, the first current value is greater than the current threshold and lasts for a second set duration, and the difference is greater than or equal to zero, then the bypass circuit breaker is controlled to close, wherein the first set duration is greater than or equal to the second set duration.

3. The method according to claim 1, characterized in that, The multiple converter stations include rectifier stations and inverter stations.

4. The method according to claim 1, characterized in that, The two series-connected converter valve groups include a high-end valve group connected to the positive bus and a low-end valve group connected to the neutral bus.

5. The method according to claim 2, characterized in that, The current threshold is 60%-80% of the rated current value of the converter station.

6. A power transmission system protection device, characterized in that, The power transmission system includes multiple converter stations. Each converter station includes: two converter valve groups connected in series, a bypass circuit breaker connected in parallel with each converter valve group, and a bypass isolating switch connected in parallel with each converter valve group. The first end of the converter station is connected to the neutral bus, and the second end is connected to the positive bus. The device includes: The signal acquisition module is used to acquire the position signal of the bypass circuit breaker and the position signal of the bypass disconnect switch, wherein the position signal of the bypass circuit breaker and the position signal of the bypass disconnect switch both include one of a closed position signal and an open position signal; The current acquisition module is used to acquire the first current value on the bypass circuit breaker, the second current value on the neutral bus, and the third current value on the positive bus. The control module is used to determine whether to control the bypass circuit breaker to close in order to protect the power transmission system based on the position signal of the bypass circuit breaker, the position signal of the bypass isolating switch, the first current value, the second current value, and the third current value. The control module includes: a difference determination unit, a time determination unit, and a protection unit, wherein: The difference determination unit is used to determine the difference between the larger of the second current value and the third current value and the first current value; The timing determination unit is used to continuously acquire the position signal of the bypass circuit breaker and determine the disconnection time when the position signal of the bypass circuit breaker changes from a closed position signal to an open position signal. The protection unit is used to determine whether to control the bypass circuit breaker to close in order to protect the power transmission system based on the position signal of the bypass disconnecting switch, the first current value, and the difference value within a first set time period from the disconnection time.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

9. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

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