Fault detection method, device, equipment and computer storage medium

Abstract

Embodiments of the present application provide a fault detection method, device, equipment and computer storage medium. The method comprises: obtaining traveling wave data, fault initial traveling wave data and circuit voltage variation data in a circuit, judging the position data and fault pole data of the fault based on the obtained data, and further determining the fault data in the circuit. According to the fault detection method of the embodiments of the present application, the traveling wave data, the fault initial traveling wave data and the circuit voltage variation data in the circuit can be obtained, and the fault position and the fault pole in the circuit can be judged, so that the fault data in the circuit can be accurately determined.

Description

Technical Field

[0001] This application belongs to the field of ultra-high voltage direct current transmission technology, and in particular relates to a fault detection method, device, equipment and computer storage medium. Background Technology

[0002] Currently, given the vast distances between energy bases in western my country and load centers in the east, ultra-high-voltage direct current (UHVDC) transmission technology enables energy transfer. To ensure the safe and stable operation of UHVDC transmission projects, line protection is used for fault detection. Existing line protection methods primarily employ traveling wave protection and differential current protection, which yield inaccurate fault data, affecting the accuracy of fault location determination and consequently impacting the speed and sensitivity of fault data identification. Summary of the Invention

[0003] This application provides a fault detection method, apparatus, device, and computer storage medium that can accurately determine fault data in a circuit.

[0004] In a first aspect, embodiments of this application provide a fault detection method, the method comprising:

[0005] Acquire circuit data for the positive and negative terminals of the circuit. The circuit data includes traveling wave data and circuit voltage change data at different times between the two target smoothing reactors. The circuit voltage change data includes pole mode voltage change and zero mode voltage change. The traveling wave data at different times between the two target smoothing reactors includes the initial traveling wave data of the fault between the two target smoothing reactors.

[0006] Based on the initial traveling wave data of the fault between the two target smoothing reactors, it is determined whether the initial traveling wave data of the fault in the first range position contains a reverse traveling wave component and the change amplitude of the initial traveling wave, and a first result is obtained. The first range position is the position range between the target smoothing reactor and the target measurement point. The target measurement point is between the two target smoothing reactors located on the same pole.

[0007] Based on the traveling wave data at different times between the two target smoothing reactors, it is determined whether the traveling wave data at the first time and the traveling wave data at the second time at the second range position satisfy the condition that the reverse current traveling wave data at the first time and the forward current traveling wave data at the second time are equal, and a second result is obtained. The difference between the first time and the second time is a preset time length, and the second range position is the range position between two target measurement points located on the same pole.

[0008] When the first result or the second result meets the preset fault condition, the location of the fault in the circuit is determined;

[0009] The fault pole in the circuit is determined based on the changes in pole-mode voltage and zero-mode voltage.

[0010] Based on the location data of the fault in the circuit and the fault pole of the fault, the fault data in the circuit is generated.

[0011] Secondly, embodiments of this application provide a fault detection device, the device comprising:

[0012] The acquisition module is used to acquire circuit data of the positive and negative terminals of the circuit. The circuit data includes traveling wave data and circuit voltage change data at different times between the two target smoothing reactors. The circuit voltage change data includes pole mode voltage change and zero mode voltage change. The traveling wave data between the two target smoothing reactors at different times includes the initial traveling wave data of the fault between the two target smoothing reactors.

[0013] The judgment module is used to determine whether the initial traveling wave data of the fault at the first range position contains a reverse traveling wave component and the change amplitude of the initial traveling wave based on the initial traveling wave data of the fault between two target smoothing reactors, and to obtain a first result. The first range position is the position range between the target smoothing reactor and the target measurement point. The target measurement point is between two target smoothing reactors located on the same pole.

[0014] The judgment module is used to determine, based on the traveling wave data at different times between two target smoothing reactors, whether the traveling wave data at the first time and the traveling wave data at the second time of the second range position satisfy the condition that the current reverse traveling wave data at the first time and the current forward traveling wave data at the second time are equal, and obtains a second result. The difference between the first time and the second time is a preset time length, and the second range position is the range position between two target measurement points located on the same pole.

[0015] The determination module is used to determine the location of the fault in the circuit when the first result or the second result meets the preset fault conditions;

[0016] The judgment module is used to determine the faulty pole of the circuit based on the changes in pole-mode voltage and zero-mode voltage.

[0017] The generation module is used to generate fault data in the circuit based on the location data of the fault in the circuit and the fault pole of the fault.

[0018] Thirdly, embodiments of this application provide a fault detection device, the device comprising:

[0019] Processor, and memory storing computer program instructions;

[0020] The processor reads and executes computer program instructions to implement the fault detection method of the first aspect.

[0021] Fourthly, embodiments of this application provide a computer storage medium.

[0022] The computer storage medium stores computer program instructions, which, when executed by the processor, implement the fault detection method of the first aspect.

[0023] Fifthly, embodiments of this application provide a computer program product in which instructions, when executed by the processor of an electronic device, cause the electronic device to perform the fault detection method of the first aspect.

[0024] The fault detection method, apparatus, device, and computer storage medium of this application embodiment can determine the fault location data and fault pole data in the circuit based on the acquired traveling wave data and circuit voltage change data, and generate fault data, thereby improving the accuracy of fault data determination. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic flowchart of a fault detection method provided in an embodiment of this application;

[0027] Figure 2 This is a diagram of a bipolar ultra-high voltage direct current transmission structure provided in an embodiment of this application;

[0028] Figure 3 This is a circuit structure diagram of an application fault detection method provided in an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of a fault point setting provided in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the structure of a fault detection device provided in an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of the structure of a fault detection device provided in an embodiment of this application. Detailed Implementation

[0032] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0034] Currently, ensuring the safe and stable operation of ultra-high voltage direct current (UHVDC) transmission projects is of paramount importance. Existing line protection schemes employ traveling wave protection as the primary protection and current differential protection as backup, acting to activate the protection system based on fault location data, thus jointly safeguarding the entire line. However, this method cannot accurately pinpoint the fault location within the line, posing a risk of false tripping at non-faulty poles, and consequently compromising the speed and sensitivity of fault data determination.

[0035] To address the problems of the prior art, embodiments of this application provide a fault detection method, apparatus, device, and computer storage medium. The fault detection method provided in this application embodiment will be described first below.

[0036] Figure 1 A flowchart illustrating a fault detection method according to an embodiment of this application is shown. Figure 1 As shown, the method may include the following steps:

[0037] S110. Obtain circuit data for the positive and negative terminals of the circuit. The circuit data includes traveling wave data and circuit voltage change data at different times between the two target smoothing reactors. The circuit voltage change data includes pole mode voltage change and zero mode voltage change. The traveling wave data at different times between the two target smoothing reactors includes the initial traveling wave data of the fault between the two target smoothing reactors.

[0038] The current and voltage data in the circuit are acquired by a protection device configured in a bipolar configuration. Specifically, the traveling wave data and circuit voltage change data at different times between two target smoothing reactors located at the positive or negative poles of the circuit are acquired. The traveling wave data between the two target smoothing reactors at different times includes the initial traveling wave data of the fault between the two target smoothing reactors. The circuit voltage change data includes pole-mode voltage change and zero-mode voltage change, which are obtained by decoupling the positive and negative voltage changes in the circuit.

[0039] In some embodiments, a protection device is configured at each end of the circuit, on both the rectifier side and the inverter side, and the protection devices at both ends exchange data via optical fiber communication. Simultaneously, the protection devices at both ends perform high-precision time synchronization using a time synchronization device to ensure the accuracy of the acquired data.

[0040] S120. Based on the initial traveling wave data of the fault between the two target smoothing reactors, determine whether the initial traveling wave data of the fault at the first range location contains a reverse traveling wave component and the amplitude of the initial traveling wave change, and obtain the first result. The first range location is the position range between the target smoothing reactor and the target measurement point. The target measurement point is between the two target smoothing reactors located on the same pole.

[0041] Based on the single-ended anti-traveling wave protection principle of wavelet transform, and based on the acquired initial traveling wave data of the fault, it is determined whether the range between two target smoothing reactors on the same pole contains an anti-traveling wave component, and the amplitude of the initial traveling wave is determined to obtain the first result of the judgment. The amplitude of the initial traveling wave can be distinguished by the modulus maxima of the wavelet transform.

[0042] S130. Based on the traveling wave data at different times between the two target smoothing reactors, determine whether the traveling wave data at the first time and the traveling wave data at the second time at the second range position satisfy the condition that the current reverse traveling wave data at the first time and the current forward traveling wave data at the second time are equal, and obtain the second result. The difference between the first time and the second time is a preset time length, and the second range position is the range position between two target measurement points located on the same pole.

[0043] Based on the traveling wave differential protection principle, the traveling wave data at the first and second moments are determined based on the traveling wave data acquired at different times between target smoothing reactors located on the same pole in the circuit. It is then determined whether the reverse current traveling wave data at the first moment within a second range is equal to the forward current traveling wave data at the second moment. The difference between the first and second moments is a preset time length, specifically, the time it takes for the wave velocity to propagate along the entire length of the line when the line is lossless. The second range refers to the position between two target measurement points in the circuit on the same pole.

[0044] S140. When the first result or the second result meets the preset fault conditions, determine the location of the fault in the circuit.

[0045] Based on the results of the judgment, namely the first result and the second result, the location of the fault in the circuit is determined.

[0046] Specifically, when the first result contains a reverse traveling wave component and the amplitude of the initial traveling wave data change is greater than a preset threshold, the fault in the circuit is determined to be in the positive direction within a first range, where the positive direction is the direction of current transmission in the circuit; or, when the first result contains a reverse traveling wave component and the amplitude of the initial traveling wave change is not greater than a preset threshold, the fault in the circuit is determined to be in the positive direction outside the first preset range, where the first preset range refers to the range outside the first preset range in the circuit; or, when the first result does not contain a reverse traveling wave component, the fault in the circuit is determined to be in the reverse direction, where the reverse direction is the direction opposite to the positive direction. Based on the single-ended reverse traveling wave protection principle of wavelet transform, the direction of the fault can be determined according to whether the fault current and voltage traveling waves contain a reverse traveling wave component. That is, when the initial fault traveling wave contains a reverse traveling wave component, the fault occurs in the positive direction; when the initial fault traveling wave does not contain a reverse traveling wave component, the fault occurs in the reverse direction. Based on the inherent boundary characteristics of the smoothing reactor, it can be determined whether the fault occurs within or outside the zone. That is, when the initial traveling wave of the fault changes significantly, it is determined that the fault occurs within the positive zone. When the initial traveling wave of the fault rises more slowly due to passing through the smoothing reactor, it is determined that the fault occurs outside the positive zone.

[0047] Alternatively, when the second result is that the reverse current traveling wave data at the first moment is equal to the forward current traveling wave data at the second moment, the fault in the circuit is determined to be within the second preset range; when the second result is that the reverse current traveling wave data at the first moment is not equal to the forward current traveling wave data at the second moment, the fault in the circuit is determined to be outside the second preset range, where outside the second preset range refers to the range in the circuit other than the second preset range. Based on the traveling wave differential protection principle, since traveling waves have transmission invariance, when there is no fault in the circuit or a fault occurs outside the zone, in the circuit of the same pole, the reverse current traveling wave data at the first moment at the first terminal is equal to the forward current traveling wave data at the second moment at the second terminal; when a fault occurs within the zone of the circuit, the reverse current traveling wave data at the first moment at the first terminal is not equal to the forward current traveling wave data at the second moment at the second terminal.

[0048] S150, Based on the change in pole-mode voltage and the change in zero-mode voltage, determine the fault pole in the circuit.

[0049] The relationship between the changes in pole-mode voltage and the changes in zero-mode voltage differs under different fault types. Therefore, the faulty pole in the circuit can be determined based on the data of changes in pole-mode voltage and zero-mode voltage.

[0050] The fault detection method provided in this application can determine the fault location data in the circuit based on the acquired traveling wave data and the initial traveling wave data of the fault, and determine the fault pole data of the fault in the circuit based on the circuit voltage change data, thereby generating fault data and improving the accuracy of fault data determination.

[0051] In some embodiments, determining the fault pole of a circuit based on the changes in pole-mode voltage and zero-mode voltage includes: when the changes in pole-mode voltage and zero-mode voltage are equal in magnitude and opposite in sign, the fault pole is determined to be positive; when the changes in pole-mode voltage and zero-mode voltage are equal in magnitude and have the same sign, the fault pole is determined to be negative; when the change in zero-mode voltage is much smaller than the change in pole-mode voltage, the fault pole is determined to be bipolar. The fault pole is determined based on the relationship between the changes in pole-mode voltage and zero-mode voltage in the circuit. When the fault is positive, the changes in pole-mode voltage and zero-mode voltage are equal in magnitude and opposite in sign; when the fault is negative, the changes in pole-mode voltage and zero-mode voltage are equal in magnitude and have the same sign; when the fault is bipolar, the change in zero-mode voltage is much smaller than the change in pole-mode voltage.

[0052] In some embodiments, the target smoothing reactor includes a first smoothing reactor and a second smoothing reactor; the target measurement point includes a first target measurement point and a second target measurement point; based on the initial traveling wave data of the fault between the two target smoothing reactors, it is determined whether the initial traveling wave data at a first range location contains a reverse traveling wave component and the amplitude of the initial traveling wave change, to obtain a first result, wherein the first range location is the position range between the target smoothing reactor and the target measurement point, and the target measurement point is between the two target smoothing reactors located on the same pole, including: based on the initial traveling wave data of the fault between the two target smoothing reactors, determining whether the initial traveling wave data of the fault between the first smoothing reactor and the second target measurement point contains a reverse traveling wave component and the amplitude of the initial traveling wave change, to obtain a first result, wherein the first range location is the position range between the target smoothing reactor and the target measurement point, and the target measurement point is between the two target smoothing reactors located on the same pole. The fault initial traveling wave data is used to determine whether it contains a reverse traveling wave component and the amplitude of the initial traveling wave change. Based on the fault initial traveling wave data between two target smoothing reactors, it is determined whether the fault initial traveling wave data between the second smoothing reactor and the first target measurement point contains a reverse traveling wave component and the amplitude of the initial traveling wave change. The first smoothing reactor is deployed at the first end of the circuit, the second smoothing reactor is deployed at the second end of the circuit, the first target measurement point is deployed between the first and second smoothing reactors near the first smoothing reactor, and the second target measurement point is deployed between the first and second smoothing reactors near the second smoothing reactor. When determining the fault location based on the single-ended reverse traveling wave protection principle of wavelet transform, the determined fault location range is either the range between the target smoothing reactor at the first end and the target measurement point at the second end, or the range between the target measurement point at the first end and the target smoothing reactor at the second end.

[0053] In some embodiments, the method further includes: when a first result meets a preset fault condition, performing a reverse traveling wave protection action based on the first result; and when a second result meets a preset fault condition, performing a traveling wave differential protection action based on the second result. When a fault is determined to be in a first range based on the first result, a reverse traveling wave protection action is performed; when a fault is determined to be in a second range based on the second result, a traveling wave differential protection action is performed.

[0054] In some embodiments, acquiring circuit data for the positive and negative terminals of the circuit includes: acquiring initial traveling wave data and circuit voltage change data between the target smoothing reactors at the positive terminal of the circuit, and initial traveling wave data and circuit voltage change data between the target smoothing reactors at the negative terminal of the circuit.

[0055] In one example, such as Figure 2 The diagram shows a bipolar ultra-high voltage direct current transmission structure, including smoothing reactors L1 and L2 deployed on the positive pole, target measurement points M1 and M2, and smoothing reactors L3 and L4 deployed on the negative pole, target measurement points M3 and M4.

[0056] In one example, such as Figure 3The diagram shows a circuit structure using the aforementioned fault detection method, including a protection device, a time synchronization device, and a merging unit. The protection device is configured bipolarly. Its functions include: receiving voltage and current data from the positive and negative terminals; receiving B-code time synchronization and possessing self-timekeeping functionality; communication with the peer device; and running the protection algorithm and outputting results. The time synchronization device is typically a GPS or BeiDou time synchronization system. High-precision time synchronization is required for the travel-wave differential protection algorithm to run. The merging unit receives voltage and current data sampled by the PT and CT from the positive and negative terminals and transmits it to the protection device. The protection devices on both sides exchange data via fiber optic communication, typically implemented through an SDH network.

[0057] In one example, an ultra-high voltage direct current (UHVDC) transmission model was built using PSCAD / EMTDC simulation software. The model parameters were: rated voltage ±1100kV, rated current 5kA, line length 3284km, and smoothing reactor value 75mH. Fault points were set as follows: Figure 4 As shown, F1, F2, F3, F4, and F5. Based on the above parameters, the experimental results are shown in Tables 1, 2, 3, and 4. For example, when the fault point F1 is set 10km away from the M (first end) side and the fault pole is positive, the protection action on the M side is: reverse traveling wave protection and traveling wave differential protection are activated; the protection action on the N (second end) side is: reverse traveling wave protection and traveling wave differential protection are activated. When the fault point F2 is set as a positive fault, the protection action on the M side is: reverse traveling wave protection and traveling wave differential protection are not activated; the protection action on the N side is: reverse traveling wave protection is activated; the fault point F4 is set as a positive fault, the protection action on the M side is: reverse traveling wave protection and traveling wave differential protection are not activated; the protection action on the N side is: reverse traveling wave protection and traveling wave differential protection are not activated. When the fault point F1 is set as a positive fault, the polarity selection on the M side is positive, and the polarity selection on the N side is positive.

[0058] Table 1

[0059]

[0060] Table 2

[0061]

[0062] Table 3

[0063]

[0064] Table 4

[0065]

[0066]

[0067] The fault detection method provided in this application can determine the fault location data in the circuit based on the acquired traveling wave data and initial traveling wave data of the fault, and determine the fault pole data of the fault in the circuit based on the circuit voltage change data. The generated fault data improves the accuracy of fault data determination. Furthermore, based on the determined fault data, corresponding protection actions are executed to ensure the safety of the circuit.

[0068] Figure 5 This is a schematic diagram of the structure of a fault detection device 500 provided in an embodiment of this application. Figure 5 As shown, the device may include an acquisition module 510, a judgment module 520, a determination module 530, and a generation module 540.

[0069] The acquisition module 510 is used to acquire circuit data of the positive and negative terminals of the circuit. The circuit data includes traveling wave data and circuit voltage change data at different times between the two target smoothing reactors. The circuit voltage change data includes pole mode voltage change and zero mode voltage change. The traveling wave data at different times between the two target smoothing reactors includes the initial fault traveling wave data between the two target smoothing reactors.

[0070] The judgment module 520 is used to determine, based on the fault initial traveling wave data between two target smoothing reactors, whether the fault initial traveling wave data at the first range position contains a reverse traveling wave component and the change amplitude of the initial traveling wave, and to obtain a first result. The first range position is the position range between the target smoothing reactor and the target measurement point. The target measurement point is between two target smoothing reactors located on the same pole.

[0071] The judgment module 520 is used to determine, based on the traveling wave data at different times between the two target smoothing reactors, whether the traveling wave data at the first time and the traveling wave data at the second time at the second range position satisfy the condition that the current reverse traveling wave data at the first time and the current forward traveling wave data at the second time are equal, and obtain a second result. The difference between the first time and the second time is a preset time length, and the second range position is the range position between two target measurement points located on the same pole.

[0072] The determination module 530 is used to determine the location of the fault in the circuit when the first result or the second result meets the preset fault conditions;

[0073] The judgment module 520 is used to determine the fault pole of the circuit based on the change in pole-mode voltage and the change in zero-mode voltage.

[0074] The generation module 540 is used to generate fault data in the circuit based on the location data of the fault in the circuit and the fault pole of the fault.

[0075] The fault detection device provided in this application embodiment can determine the fault location data in the circuit based on the acquired traveling wave data and initial traveling wave data of the fault, and determine the fault pole data of the fault in the circuit based on the circuit voltage change data, thereby generating fault data and improving the accuracy of fault data determination.

[0076] In some embodiments, the determining module 530 is configured to determine the location of a fault in the circuit when the first result or the second result satisfies a preset fault condition, including: the determining module 530 is configured to determine the fault in the circuit as being in the positive direction within a first range when the first result contains a reverse traveling wave component and the amplitude of the initial traveling wave data change is greater than a preset threshold, wherein the positive direction is the direction of current transmission in the circuit; or, the determining module 530 is configured to determine the fault in the circuit as being in the positive direction outside a first preset range when the first result contains a reverse traveling wave component and the amplitude of the initial traveling wave change is not greater than a preset threshold, wherein the first preset range is the direction outside the first preset range. The range outside the first preset range; or, the determining module 530 is used to determine that the fault in the circuit is in the opposite direction when the first result is that it does not contain the reverse traveling wave component, where the reverse direction is the direction opposite to the positive direction; or, the determining module 530 is used to determine that the fault in the circuit is within the second preset range when the second result is that the current reverse traveling wave data at the first moment is equal to the current forward traveling wave data at the second moment; the determining module 530 is used to determine that the fault in the circuit is outside the second preset range when the second result is that the current reverse traveling wave data at the first moment is not equal to the current forward traveling wave data at the second moment, where the second preset range is the range in the circuit other than the second preset range.

[0077] In some embodiments, the judgment module 520 is used to determine the fault pole of a fault in a circuit based on the change in pole-mode voltage and the change in zero-mode voltage, including: the judgment module 520 is used to determine that the fault pole of a fault in a circuit is positive when the change in pole-mode voltage and the change in zero-mode voltage are equal in magnitude and opposite in sign; the judgment module 520 is used to determine that the fault pole of a fault in a circuit is negative when the change in pole-mode voltage and the change in zero-mode voltage are equal in magnitude and have the same sign; and the judgment module 520 is used to determine that the fault pole of a fault in a circuit is bipolar when the change in zero-mode voltage is much smaller than the change in pole-mode voltage.

[0078] In some embodiments, the target smoothing reactor includes a first smoothing reactor and a second smoothing reactor; the target measurement point includes a first target measurement point and a second target measurement point; the judgment module 520 is used to determine, based on the initial traveling wave data of the fault between the two target smoothing reactors, whether the initial traveling wave data at a first range location contains a reverse traveling wave component and the amplitude of the initial traveling wave change, to obtain a first result, wherein the first range location is the position range between the target smoothing reactor and the target measurement point, and the target measurement point is located between two target smoothing reactors on the same pole, including: the judgment module 520, used to determine, based on the initial traveling wave data of the fault between the two target smoothing reactors, whether the first smoothing reactor and the second target smoothing reactor contain ... to obtain a first result, wherein the first smoothing reactor and the second target smoothing reactor contain a reverse traveling wave component and the amplitude of the initial traveling wave change, to obtain a first result, wherein the first range location is the position range between the target smoothing reactor and the target measurement point, and the target measurement point is located between two target smoothing reactors on the same pole, to obtain a first result, wherein the first smoothing reactor and the target measurement point are located between two target smoothing reactors, and the target measurement point is located between two target smoothing reactors, including a first smoothing reactor and the second target smoothing reactor, to obtain a first result, wherein the first smoothing reactor and the target The determination module 520 is used to determine whether the initial traveling wave data of the fault between the measurement points contains a reverse traveling wave component and the amplitude of the initial traveling wave change, based on the initial traveling wave data of the fault between the two target smoothing reactors. The first smoothing reactor is deployed at the first end of the circuit, the second smoothing reactor is deployed at the second end of the circuit, the first target measurement point is deployed between the first and second smoothing reactors near the first smoothing reactor, and the second target measurement point is deployed between the first and second smoothing reactors near the second smoothing reactor.

[0079] In some embodiments, the apparatus further includes: an execution module 550, configured to perform a reverse traveling wave protection action based on the first result when the first result meets a preset fault condition; and an execution module 550, configured to perform a traveling wave differential protection action based on the second result when the second result meets a preset fault condition.

[0080] In some embodiments, the acquisition module 510 is used to acquire circuit data of the positive and negative terminals of the circuit, including: the acquisition module 510 is used to acquire the initial traveling wave data and circuit voltage change data between the target smoothing reactors of the positive terminal of the circuit, and the initial traveling wave data and circuit voltage change data between the target smoothing reactors of the negative terminal of the circuit.

[0081] The fault detection device provided in this application embodiment can determine the fault location data in the circuit based on the acquired traveling wave data and initial traveling wave data of the fault, and determine the fault pole data of the fault in the circuit based on the circuit voltage change data. The generated fault data improves the accuracy of fault data determination. Furthermore, based on the determined fault data, corresponding protection actions are executed to ensure the safety of the circuit.

[0082] Figure 5 Each module / unit in the illustrated device has the ability to implement Figure 1 The functions of each step in the process and their corresponding technical effects are described in detail here for the sake of brevity.

[0083] Figure 6 A schematic diagram of the hardware structure of the fault detection device provided in an embodiment of this application is shown.

[0084] The fault detection device may include a processor 601 and a memory 602 storing computer program instructions.

[0085] Specifically, the processor 601 may include a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0086] Memory 602 may include mass storage for data or instructions. For example, and not limitingly, memory 602 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. In one instance, memory 602 may include removable or non-removable (or fixed) media, or memory 602 may be non-volatile solid-state memory. Memory 602 may be internal or external to the integrated gateway disaster recovery device.

[0087] In one example, memory 602 may include read-only memory (ROM), random access memory (RAM), disk storage media device, optical storage media device, flash memory device, electrical, optical, or other physical / tangible memory storage device. Therefore, typically, memory 602 includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to one aspect of this application.

[0088] The processor 601 reads and executes computer program instructions stored in the memory 602 to achieve... Figure 1 The method / steps S110 to S160 in the illustrated embodiment are completed, and the desired outcome is achieved. Figure 1 The technical effects achieved by executing the methods / steps shown in the examples are not elaborated here for the sake of brevity.

[0089] In one example, the fault detection device may further include a communication interface 603 and a bus 610. Wherein, as Figure 6As shown, the processor 601, memory 602, and communication interface 603 are connected through bus 610 and complete communication with each other.

[0090] The communication interface 603 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0091] Bus 610 includes hardware, software, or both, that couples components of a fault detection device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 610 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, this application contemplates any suitable bus or interconnect.

[0092] This fault detection device can execute the fault detection method in this application embodiment based on traveling wave data in the circuit, initial traveling wave data of the fault, and circuit voltage change data, thereby achieving a combination of... Figure 1 The fault detection method is described.

[0093] Furthermore, in conjunction with the fault detection methods in the above embodiments, this application embodiment can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the fault detection methods in the above embodiments.

[0094] This application provides a computer program product in which the instructions are executed by the processor of an electronic device, causing the electronic device to perform any of the fault detection methods described in the above embodiments.

[0095] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0096] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0097] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0098] The aspects of this application have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, 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, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by dedicated hardware performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0099] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A fault detection method characterized by, The method comprises the following steps: obtaining circuit data of positive and negative electrodes, the circuit data comprising traveling wave data and circuit voltage variation data at different time points between two target traveling wave reactors, the circuit voltage variation data comprising polar mode voltage variation and zero mode voltage variation, and the traveling wave data at different time points between the two target traveling wave reactors comprising fault initial traveling wave data between the two target traveling wave reactors; judging whether the fault initial traveling wave data at a first range position contains a counter-traveling wave component and a variation amplitude of the initial traveling wave based on the fault initial traveling wave data between the two target traveling wave reactors, obtaining a first result, the first range position being a position range between a target traveling wave reactor and a target measurement point, and the target measurement point being between the two target traveling wave reactors at the same pole; judging whether the traveling wave data at a first time point and the traveling wave data at a second time point at a second range position satisfy a condition that current counter-traveling wave data at the first time point is equal to current forward-traveling wave data at the second time point based on the traveling wave data at different time points between the two target traveling wave reactors, obtaining a second result, the difference between the first time point and the second time point being a preset time length, and the second range position being a range position between two target measurement points at the same pole; determining a position of a fault in the circuit when the first result or the second result satisfies a preset fault condition; judging a fault pole of the fault in the circuit based on the polar mode voltage variation and the zero mode voltage variation; generating fault data of the fault in the circuit based on the position data of the fault in the circuit and the fault pole of the fault.

2. The method of claim 1, wherein, The step of determining the position of the fault in the circuit when the first result or the second result satisfies the preset fault condition comprises: when the first result contains the counter-traveling wave component and the variation amplitude of the initial traveling wave data is greater than a preset threshold, determining that the fault in the circuit is in a positive direction in the first range position, the positive direction being a transmission direction of current in the circuit; or when the first result contains the counter-traveling wave component and the variation amplitude of the initial traveling wave is not greater than the preset threshold, determining that the fault in the circuit is in a positive direction outside a first preset range, the positive direction outside the first preset range being a range other than the first preset range in the circuit; or when the first result does not contain the counter-traveling wave component, determining that the fault in the circuit is in a reverse direction, the reverse direction being a direction opposite to the positive direction; or when the second result is that the current counter-traveling wave data at the first time point is equal to the current forward-traveling wave data at the second time point, determining that the fault in the circuit is in a second preset range; or when the second result is that the current counter-traveling wave data at the first time point is not equal to the current forward-traveling wave data at the second time point, determining that the fault in the circuit is outside the second preset range, the second preset range being a range other than the second preset range in the circuit. The step of judging the fault pole of the fault in the circuit based on the polar mode voltage variation and the zero mode voltage variation comprises:

3. The method according to claim 1 or 2, characterized in that, ​ determining that the fault pole of the fault in the circuit is a positive pole when the amplitude of the change of the polar mode voltage is equal to the amplitude of the change of the zero mode voltage and the sign of the change of the polar mode voltage is opposite to the sign of the change of the zero mode voltage; determining that the fault pole of the fault in the circuit is a negative pole when the amplitude of the change of the polar mode voltage is equal to the amplitude of the change of the zero mode voltage and the sign of the change of the polar mode voltage is the same as the sign of the change of the zero mode voltage; determining that the fault pole of the fault in the circuit is a bipolar pole when the amplitude of the change of the zero mode voltage is much smaller than the amplitude of the change of the polar mode voltage.

4. The method of claim 1, wherein, The target smoothing reactors include a first smoothing reactor and a second smoothing reactor; the target measurement points include a first target measurement point and a second target measurement point; the first result is obtained by judging whether the fault initial traveling wave data of the first range position contains a counter-traveling wave component and the change amplitude of the initial traveling wave based on the fault initial traveling wave data between the two target smoothing reactors, the first range position being a position range between the target smoothing reactors and the target measurement points, the target measurement points being located between the two target smoothing reactors at the same pole, and including: judging whether the fault initial traveling wave data between the first smoothing reactor and the second target measurement point contains a counter-traveling wave component and the change amplitude of the initial traveling wave based on the fault initial traveling wave data between the two target smoothing reactors; judging whether the fault initial traveling wave data between the second smoothing reactor and the first target measurement point contains a counter-traveling wave component and the change amplitude of the initial traveling wave based on the fault initial traveling wave data between the two target smoothing reactors; wherein the first smoothing reactor is arranged at a first end in the circuit, the second smoothing reactor is arranged at a second end in the circuit, the first target measurement point is arranged at a position close to the first smoothing reactor between the first smoothing reactor and the second smoothing reactor, and the second target measurement point is arranged at a position close to the second smoothing reactor between the first smoothing reactor and the second smoothing reactor.

5. The method of claim 1, wherein, The method further includes: performing a counter-traveling wave protection action based on the first result when the first result satisfies a preset fault condition; performing a traveling wave differential protection action based on the second result when the second result satisfies a preset fault condition.

6. The method of claim 1, wherein, The circuit data of the positive pole and the negative pole is obtained, including: obtaining the initial traveling wave data between the target smoothing reactors of the positive pole, the circuit voltage change data, the initial traveling wave data between the target smoothing reactors of the negative pole, and the circuit voltage change data.

7. A fault detection apparatus characterized by comprising: The device includes: an obtaining module configured to obtain circuit data of a positive pole and a negative pole, the circuit data including traveling wave data at different time points between two target smoothing reactors and circuit voltage change data, the circuit voltage change data including a polar mode voltage change and a zero mode voltage change, and the traveling wave data at different time points between the two target smoothing reactors including fault initial traveling wave data between the two target smoothing reactors; The judgment module is configured to judge whether the fault initial traveling wave data at the first range position contains a counter-traveling wave component and a change amplitude of the initial traveling wave based on the fault initial traveling wave data between the two target traveling wave reactors, to obtain a first result, and the first range position is a position range between the target traveling wave reactors and a target measurement point, and the target measurement point is between the two target traveling wave reactors at the same pole. The judgment module is configured to judge whether the traveling wave data at the first time and the traveling wave data at the second time at the second range position satisfy that the current counter-traveling wave data in the traveling wave data at the first time is equal to the current forward-traveling wave data in the traveling wave data at the second time based on the traveling wave data at different times between the two target traveling wave reactors, to obtain a second result, and the difference between the first time and the second time is a preset time length, and the second range position is a range position between two target measurement points at the same pole. The determination module is configured to determine a position of a fault in the circuit when the first result or the second result satisfies a preset fault condition. The judgment module is configured to judge a fault pole of the fault in the circuit based on the pole-mode voltage change and the zero-mode voltage change. The generation module is configured to generate fault data of the fault in the circuit based on the position data of the fault in the circuit and the fault pole of the fault.

8. A fault detection device, characterized by The fault detection device comprises a processor and a memory storing computer program instructions. The processor reads and executes the computer program instructions to implement the fault detection method in any one of claims 1-6.

9. A computer storage medium, characterized in that The computer storage medium stores computer program instructions, and the computer program instructions are executed by the processor to implement the fault detection method in any one of claims 1-6.

10. A computer program product, characterised in that, The instructions in the computer program product are executed by the processor of the electronic device to enable the electronic device to perform the fault detection method in any one of claims 1-6.

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