Power grid fault detection method, device and equipment and storage medium

Abstract

The invention discloses a power grid fault detection method, apparatus and device, and a storage medium. The power grid fault detection method comprises the steps of obtaining a wave recording file corresponding to a to-be-detected line; determining a fault type of an initial fault of the to-be-detected line based on the three-phase voltage and current information before the fault of the to-be-detected line and the three-phase voltage and current information after the fault of the to-be-detected line in the wave recording file; and detecting whether the to-be-detected line has a target fault based on the fault type of the initial fault, the three-phase voltage and current information before the fault of the to-be-detected line occurs, and the three-phase voltage and current information before the fault of the to-be-detected line is removed. According to the technical scheme, developmental faults in the to-be-detected line can be found in time, and the safety of power grid operation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of relay protection, and in particular to a power grid fault detection method, device, equipment and storage medium. Background Art

[0002] With the increasing complexity of power grid systems and the continuous increase in loads, the problem of developmental faults in power grid systems has become increasingly prominent. Developmental faults refer to the gradual evolution of an initial single-phase grounding fault into a two-phase short-circuit grounding fault including this phase. This type of fault often occurs in a power grid system after a fault. However, if the fault development is not judged in time, it may eventually cause the protection devices in the power grid system to perform incorrect actions, further expanding the scope of impact.

[0003] At present, the research and application of developing faults are not in-depth enough, especially in how to effectively identify developing faults. Therefore, a fault detection method for identifying developing faults in power systems is urgently needed to cope with the more complex and changeable power grid environment in the future. Summary of the invention

[0004] The present invention provides a power grid fault detection method, device, equipment and storage medium to effectively identify developing faults existing in the power grid.

[0005] According to one aspect of the present invention, a method for detecting a power grid fault is provided, the method comprising:

[0006] Obtaining a recording file corresponding to a line to be detected; wherein the line to be detected refers to a line where a fault occurs in a power grid;

[0007] Based on the three-phase voltage and current information of the line to be detected before the fault occurs in the recording file, and the three-phase voltage and current information of the line to be detected after the fault occurs, determine the fault type of the initial fault of the line to be detected; wherein the initial fault refers to the fault that occurs for the first time in the current detection cycle of the line to be detected, and the fault type includes a single-phase grounding fault and a two-phase grounding fault;

[0008] Based on the fault type of the initial fault, the three-phase voltage and current information of the line to be detected before the fault occurs, and the three-phase voltage and current information of the line to be detected before the fault is removed, detect whether the line to be detected has a target fault; wherein the target fault refers to a developing fault in the power grid.

[0009] According to another aspect of the present invention, there is provided a power grid fault detection device, the device comprising:

[0010] A file acquisition module is used to acquire a recording file corresponding to a line to be detected; wherein the line to be detected refers to a line where a fault occurs in the power grid;

[0011] A fault determination module is used to determine the fault type of the initial fault of the line to be detected based on the three-phase voltage and current information of the line to be detected before the fault occurs in the recording file, and the three-phase voltage and current information of the line to be detected after the fault occurs, wherein the initial fault refers to the fault of the line to be detected that occurs for the first time in the current detection cycle, and the fault type includes a single-phase grounding fault and a two-phase grounding fault;

[0012] The line detection module detects whether there is a target fault in the line to be detected based on the fault type of the initial fault, the three-phase voltage and current information of the line to be detected before the fault is removed, and the three-phase voltage and current information of the line to be detected before the fault occurs, wherein the target fault refers to a developing fault in the power grid.

[0013] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0014] at least one processor; and

[0015] a memory communicatively connected to the at least one processor; wherein,

[0016] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the power grid fault detection method described in any embodiment of the present invention.

[0017] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the power grid fault detection method described in any embodiment of the present invention when executed.

[0018] According to another aspect of the present invention, a computer program product is provided. The computer program comprises a computer program. When the computer program is executed by a processor, the power grid fault detection method according to any embodiment of the present invention is implemented.

[0019] The technical solution of the embodiment of the present invention determines whether there is a developmental fault in the line to be detected based on the three-phase voltage and current information of the line to be detected before a fault occurs, the three-phase voltage and current information of the line to be detected after a fault occurs, and the three-phase voltage and current information of the line to be detected before the fault is removed, without the need for complex logical operations, thereby reducing the detection cost and the configuration requirements for the detection device, and realizing timely discovery of the developmental fault in the line to be detected, thereby ensuring the correctness of the response action of the protection device in the power grid, and improving the safety of the power grid operation.

[0020] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a flow chart of a power grid fault detection method provided according to Embodiment 1 of the present invention;

[0023] Figure 2 is a flow chart of a power grid fault detection method provided according to Embodiment 2 of the present invention;

[0024] Figure 3 is a flow chart of a power grid fault detection method provided according to Embodiment 3 of the present invention;

[0025] Figure 4 is a structural schematic diagram of a power grid fault detection device provided according to a fourth embodiment of the present invention;

[0026] Figure 5 It is a structural schematic diagram of an electronic device for implementing the power grid fault detection method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] Embodiment 1

[0030] Figure 1 A flowchart of a power grid fault detection method is provided for the first embodiment of the present invention. This embodiment is applicable to the case of detecting a faulty circuit. The method can be executed by a power grid fault detection device. The power grid fault detection device can be implemented in the form of hardware and / or software. The power grid fault detection device can be configured in various general computing devices, such as a terminal device integrated with a recording system. Figure 1 As shown, the method includes:

[0031] S110, obtaining a waveform recording file corresponding to the line to be detected.

[0032] The line to be detected may refer to a line where a fault has occurred in the power grid.

[0033] It should be noted that the line to be detected may also refer to a line in the power grid that has a risk of developing faults.

[0034] In the embodiment of the present invention, since it is necessary to confirm whether there is a developing fault in the line to be detected, the waveform recording file corresponding to the line to be detected can be obtained after the fault occurring in the line to be detected is processed.

[0035] Optionally, in an embodiment of the present invention, when a protection device in the line to be detected, such as a relay protection device, detects an initial fault and removes the initial fault, it will use a preset acquisition period as the time window length, and within the preset acquisition period before the initial fault occurs to the preset acquisition period after the initial fault is removed, the three-phase voltage and current information of at least one measuring point in the line to be detected is sampled and recorded, and a recording file is generated, and the recording file will synchronously record the switch channel information and electrical channel information of the line to be detected during the fault repair process. Optionally, the location of the measuring point and the preset acquisition period can be adaptively set according to those skilled in the art.

[0036] For the line to be detected, the electrical quantity information channel can be read according to the switch quantity channel information and electrical quantity channel information in the recording file corresponding to the line to be detected, and the wavelet transform modulus maximum processing can be performed on the specific three-phase voltage and current channels. The time when the initial fault in the line to be detected is determined by comparison, and the switch quantity channel information is read to determine the circuit breaker action time as the time when the initial fault is cleared.

[0037] By parsing the recording file, the three-phase voltage and current information in the recording file is obtained, providing a data basis for subsequent detection of whether there is a developing fault in the line to be detected.

[0038] S120: Determine the fault type of the initial fault of the line to be detected based on the three-phase voltage and current information of the line to be detected before the fault occurs in the recording file and the three-phase voltage and current information of the line to be detected after the fault occurs.

[0039] The initial fault may refer to the fault that occurs for the first time in the current detection cycle of the line to be detected, and the fault type may include a single-phase grounding fault and a two-phase grounding fault. It should be noted that the fault that occurs for the first time in the current detection cycle of the line to be detected may refer to the fault before the occurrence of a developmental fault in the line to be detected, and each phase has one corresponding single-phase grounding fault type and two corresponding two-phase grounding fault types.

[0040] Specifically, in an embodiment of the present invention, a fast Fourier transform can be performed on the three-phase voltage and current information before a fault occurs in the line to be detected, and the three-phase voltage and current information after a fault occurs in the line to be detected, to obtain the voltage fundamental component and the current fundamental component of each corresponding line to be detected before a fault occurs, and the voltage fundamental component and the current fundamental component after a fault occurs in the line to be detected, and based on the information obtained after the above fast Fourier transform, the fault type of the fault occurring in the line to be detected is determined.

[0041] S130, based on the fault type of the initial fault, the three-phase voltage and current information of the line to be detected before the fault occurs, and the three-phase voltage and current information of the line to be detected before the fault is removed, detect whether the line to be detected has a target fault.

[0042] The target fault may refer to a developing fault in the power grid.

[0043] Specifically, after determining the fault type of the initial fault, a fast Fourier transform can be performed on the three-phase voltage and current information of the detection line before the fault occurs, and the three-phase voltage and current information of the detection line before the fault is removed, to obtain the voltage fundamental component and the current fundamental component of each corresponding detection line before the fault occurs, and the voltage fundamental component and the current fundamental component of each detection line before the fault is removed; and based on the voltage fundamental component and the current fundamental component of each corresponding detection line before the fault occurs, and the voltage fundamental component and the current fundamental component of each detection line before the fault is removed, the detection line is detected to determine whether it has a developmental fault; in the case of a developmental fault, a fault warning is issued to indicate the fault type of the developmental fault.

[0044] The technical solution of the embodiment of the present invention determines whether there is a developmental fault in the line to be detected based on the three-phase voltage and current information of the line to be detected before a fault occurs, the three-phase voltage and current information of the line to be detected after a fault occurs, and the three-phase voltage and current information of the line to be detected before the fault is removed, without the need for complex logical operations, thereby reducing the detection cost and the configuration requirements for the detection device, and realizing timely discovery of the developmental fault in the line to be detected, thereby ensuring the correctness of the response action of the protection device in the power grid, and improving the safety of the power grid operation.

[0045] Embodiment 2

[0046] Figure 2 This is a flowchart of a power grid fault detection method provided in the second embodiment of the present invention. This embodiment further refines the above embodiment and provides specific steps for determining the fault type of the initial fault of the line to be detected based on the three-phase voltage and current information before the line to be detected fails in the recording file, and the three-phase voltage and current information after the line to be detected fails. It should be noted that for the undetailed parts of the embodiments of the present invention, please refer to the relevant descriptions of other embodiments, which will not be repeated here. Figure 2 As shown, the method includes:

[0047] S210, obtaining the first three-phase voltage and current information of the line to be detected in a preset collection period before the initial fault occurs in the recording file, and the second three-phase voltage and current information of the line to be detected in a preset collection period after the initial fault occurs.

[0048] S220. Determine, based on the first three-phase voltage and current information and the second three-phase voltage and current information, the fault component current information and the fault component voltage information of each phase of the line to be detected after an initial fault occurs.

[0049] In an embodiment of the present invention, in order to obtain voltage and current information in different states before and after the initial fault occurs, the first three-phase voltage and current information of the line to be detected in a preset acquisition cycle before the time when the initial fault occurs and the second three-phase voltage and current information of the line to be detected in a preset acquisition cycle after the time when the initial fault occurs can be obtained in the recording file, and the first three-phase voltage and current information and the second three-phase voltage and current information are fast Fourier transformed, and the voltage fundamental component and current fundamental component corresponding to the first three-phase voltage and current information and the voltage fundamental component and current fundamental component corresponding to the second three-phase voltage and current information are obtained respectively, and according to the voltage fundamental component and current fundamental component corresponding to the first three-phase voltage and current information and the voltage fundamental component and current fundamental component corresponding to the second three-phase voltage and current information, the fault component current information and fault component voltage information of each phase of the line to be detected after the initial fault occurs are determined.

[0050] Optionally, the fault component voltage information of each phase after the initial fault occurs can be determined by the following formula:

[0051]

[0052] in, is the fault component voltage information of phase A, is the fault component voltage information of phase B, is the fault component voltage information of phase C, is the voltage fundamental component of phase A corresponding to the second three-phase voltage and current information, is the voltage fundamental component of phase A corresponding to the first three-phase voltage and current information, is the voltage fundamental component of phase B corresponding to the second three-phase voltage and current information, is the voltage fundamental component of phase B corresponding to the first three-phase voltage and current information, is the voltage fundamental component of phase C corresponding to the second three-phase voltage and current information, It is the voltage fundamental component of phase C corresponding to the first three-phase voltage and current information.

[0053] Optionally, the fault component current information of each phase after the initial fault occurs can be determined by the following formula:

[0054]

[0055] in, is the fault component current information of phase A, is the fault component current information of phase B, is the fault component current information of phase C, is the current fundamental component of phase A corresponding to the second three-phase voltage and current information, is the current fundamental component of phase A corresponding to the first three-phase voltage and current information, is the current fundamental component of phase B corresponding to the second three-phase voltage and current information, is the current fundamental component of phase B corresponding to the first three-phase voltage and current information, is the current fundamental component of phase C corresponding to the second three-phase voltage and current information, It is the current fundamental component of phase C corresponding to the first three-phase voltage and current information.

[0056] S230. According to the fault component current information and the fault component voltage information, respectively determine the fault component active power and the fault component reactive power of each phase of the line to be detected after an initial fault occurs.

[0057] Optionally, the active power of each phase after the initial fault occurs can be determined by the following formula:

[0058]

[0059] Where ΔP A , ΔP B and ΔP C are the fault component active power of each phase of the line to be detected after the initial fault occurs, and Re is the active power function.

[0060] Optionally, the reactive power of each phase after the initial fault occurs can be determined by the following formula:

[0061]

[0062] Among them, ΔQ A , ΔQ B and ΔQ C are the fault component reactive power of each phase of the line to be detected after the initial fault occurs, and Im is the reactive power function.

[0063] S240: Determine the fault type of the initial fault of the line to be detected according to the active power of the fault component and the reactive power of the fault component.

[0064] Optionally, the fault type of the initial fault of the line to be detected is determined based on the active power of the fault component and the reactive power of the fault component, including: determining the ratio of the active power of the fault components between phases, or the ratio of the reactive power of the fault components, and if a fault type threshold is met, then the fault type corresponding to the fault type threshold is used as the fault type of the initial fault.

[0065] Optionally, the ratio of the active power of the fault component can be determined by the following formula:

[0066]

[0067] Among them, k1, k2 and k3 are ratio parameters of the active power of the fault component.

[0068] Optionally, the reactive power ratio of the fault component can be determined by the following formula:

[0069]

[0070] Among them, j1, j2 and j3 are the ratio parameters of the reactive power of the fault component.

[0071] In an actual power grid operation system, the ratio parameters of the active power of the fault component and the ratio parameters of the reactive power of the fault component can be used as initial fault judgment parameters. The type of initial fault can be determined by determining the relationship between the ratio parameters of the active power of the fault component and the ratio parameters of the reactive power of the fault component and the fault active parameter threshold and the fault reactive parameter threshold, respectively.

[0072] In the embodiment of the present invention, under the ideal state of normal operation of the power grid, the fault component power calculated by each phase should be 0, but in the actual power grid operation system, certain error factors must be considered. When a fault occurs in the power grid, the fault component power calculated by the non-fault phase will have certain numerical fluctuations and is not necessarily 0. The fault component power calculated by the fault phase is not a fixed value, but has a certain regular distribution.

[0073] If the fault type of the initial fault is a single-phase ground fault, continue to perform fault detection on the line to be detected to determine whether there is a developing fault in the line to be detected. Exemplarily, as shown in Table 1, if k1, k2 and k3 all meet the range of the corresponding parameter thresholds, or j1, j2 and j3 all meet the range of the corresponding parameter thresholds, it can be indicated that the fault type of the initial fault is an A-phase ground fault (AG). Optional, M and N are both numbers greater than 1, the fault active parameter threshold and the fault reactive parameter threshold can be adaptively set according to those skilled in the art, and different fault types have different parameter threshold ranges corresponding to the fault types.

[0074] Optionally, if the fault type of the initial fault is a two-phase ground fault, the fault detection process of the line to be detected is terminated, and an alarm is issued to prompt that a two-phase ground fault has occurred in the detection line. For example, as shown in Table 2, if k1, k2 and k3 all satisfy the corresponding parameter threshold range, or j1, j2 and j3 all satisfy the corresponding parameter threshold range, it can be indicated that the fault type of the initial fault is an AB phase ground fault (ABG).

[0075] Table 1

[0076] Ratio parameter <![CDATA[k1]]> <![CDATA[k2]]> <![CDATA[k3]]> <![CDATA[j1]]> <![CDATA[j2]]> <![CDATA[j3]]> Fault type AG AG AG AG AG AG Parameter threshold range ＞M ＞M <![CDATA[M>k3>1 / M]]> ＞N ＞N <![CDATA[N>j3>1 / N]]>

[0077] Table 2

[0078] Ratio parameter k k k j j j Fault type ABG ABG ABG ABG ABG ABG Parameter threshold range <![CDATA[M>k1>1 / M]]> >M <1 / M <![CDATA[N>j1>1 / N]]> >N <1 / N

[0079] The technical solution of the embodiment of the present invention eliminates the influence of complex power grid factors by detecting the fault type based on the three-phase current and voltage information in the recording file. No matter where the fault is located in the line and the fault type, the fault type can be accurately detected, thereby improving the detection efficiency.

[0080] Embodiment 3

[0081] Figure 3 This is a flowchart of a power grid fault detection method provided in the third embodiment of the present invention. This embodiment further refines the above embodiments and provides specific steps for detecting whether there is a target fault in the line to be detected based on the fault type of the initial fault, the three-phase voltage and current information before the fault occurs in the line to be detected, and the three-phase voltage and current information before the fault of the line to be detected is removed. It should be noted that for the undetailed parts of the embodiments of the present invention, please refer to the relevant descriptions of other embodiments, which will not be repeated here. Figure 3 As shown, the method includes:

[0082] S310. When the fault type of the initial fault is a single-phase grounding fault, obtain the first three-phase voltage and current information of the line to be detected in the recording file in a preset collection period before the initial fault occurs, and the third three-phase voltage and current information of the line to be detected in a preset collection period before the initial fault is removed.

[0083] In an embodiment of the present invention, in order to obtain voltage and current information from the occurrence of an initial fault to the process of initial fault removal, the first three-phase voltage and current information of the line to be detected in a preset acquisition cycle before the occurrence of the initial fault and the third three-phase voltage and current information of the line to be detected in a preset acquisition cycle before the removal of the initial fault in the recording file can be obtained, and the first three-phase voltage and current information and the third three-phase voltage and current information are fast Fourier transformed, and the voltage fundamental component and current fundamental component corresponding to the first three-phase voltage and current information and the voltage fundamental component and current fundamental component corresponding to the third three-phase voltage and current information are obtained respectively, and the fault component current information and fault component voltage information of each phase of the line to be detected before the initial fault is removed are determined based on the voltage fundamental component and current fundamental component corresponding to the first three-phase voltage and current information and the voltage fundamental component and current fundamental component corresponding to the third three-phase voltage and current information.

[0084] S320. Determine the fault component current information and the fault component voltage information of each phase of the line to be detected before the initial fault is removed according to the first three-phase voltage and current information and the third three-phase voltage and current information.

[0085] S330. According to the fault component current information and the fault component voltage information, respectively determine the fault component active power and the fault component reactive power of each phase of the line to be detected before the initial fault is removed.

[0086] Optionally, in the embodiment of the present invention, the fault component voltage information of each phase before the initial fault is removed can be determined by the following formula:

[0087]

[0088] in, is the fault component voltage information of phase A, is the fault component voltage information of phase B, is the fault component voltage information of phase C, is the voltage fundamental component of phase A corresponding to the third three-phase voltage and current information, is the voltage fundamental component of phase A corresponding to the first three-phase voltage and current information, is the voltage fundamental component of phase B corresponding to the third three-phase voltage and current information, is the voltage fundamental component of phase B corresponding to the first three-phase voltage and current information, is the voltage fundamental component of phase C corresponding to the third three-phase voltage and current information, It is the voltage fundamental component of phase C corresponding to the first three-phase voltage and current information.

[0089] Optionally, the fault component current information of each phase before the initial fault is removed can be determined by the following formula:

[0090]

[0091] in, is the fault component current information of phase A, is the fault component current information of phase B, is the fault component current information of phase C, is the current fundamental component of phase A corresponding to the third three-phase voltage and current information, is the current fundamental component of phase A corresponding to the first three-phase voltage and current information, is the current fundamental component of phase B corresponding to the third three-phase voltage and current information, is the current fundamental component of phase B corresponding to the first three-phase voltage and current information, is the current fundamental component of phase C corresponding to the third three-phase voltage and current information, It is the current fundamental component of phase C corresponding to the first three-phase voltage and current information.

[0092] Optionally, the active power of each phase before the initial fault is cleared can be determined by the following formula:

[0093]

[0094] Among them, ΔP′ A , ΔP′ B and ΔP′ C are the fault component active power of each phase of the line to be detected before the initial fault is removed, and Re is the active power function.

[0095] Optionally, the reactive power of each phase before the initial fault is cleared can be determined by the following formula:

[0096]

[0097] Among them, ΔQ′ A , ΔQ′ B and ΔQ′ C are the fault component reactive power of each phase of the line to be detected before the initial fault is removed, and Im is the reactive power function.

[0098] S340: Determine whether a target fault occurs in the line to be detected after the initial fault is removed, based on the active power of the fault component and the reactive power of the fault component.

[0099] Optionally, the ratio of the active power of the fault component can be determined by the following formula:

[0100]

[0101] Among them, k4, k5 and k6 are ratio parameters of the active power of the fault component.

[0102] Optionally, the reactive power ratio of the fault component can be determined by the following formula:

[0103]

[0104] Among them, j4, j5 and j6 are the ratio parameters of the reactive power of the fault component.

[0105] Optionally, based on the active power of the fault component and the reactive power of the fault component, determine whether a target fault has occurred in the line to be detected after the initial fault is removed, including: determining whether the ratio of the active power of the fault components between phases, or the ratio of the reactive power of the fault components, meets the fault type threshold corresponding to the two-phase grounding fault; if so, it is determined that the target fault has occurred in the line to be detected.

[0106] Specifically, by determining the parameter range of the parameter threshold corresponding to the fault type of two-phase grounding fault satisfied by the ratio of the active power of the fault components between the phases of the line to be detected before the initial fault is removed, or the ratio of the reactive power of the fault components, it can be determined that a developmental fault has occurred in the line to be detected, and a fault warning can be issued to prompt that a two-phase grounding fault has occurred in the line to be detected and the specific fault type.

[0107] The technical solution of the embodiment of the present invention determines whether there is a developmental fault in the line to be detected based on the three-phase voltage and current information of the line to be detected before a fault occurs, the three-phase voltage and current information of the line to be detected after a fault occurs, and the three-phase voltage and current information of the line to be detected before the fault is removed, without the need for complex logical operations, thereby reducing the detection cost and the configuration requirements for the detection device, and timely discovering the developmental fault in the line to be detected to ensure the correctness of the response action of the protection device in the power grid, thereby improving the safety of the power grid operation, and performing fault detection based on the active power of the fault component generated by the three-phase voltage and current information and the reactive power of the fault component, thereby eliminating the influence of the transition resistance in the power grid and improving the resistance tolerance capability during the fault detection process.

[0108] Embodiment 4

[0109] Figure 4 A schematic diagram of the structure of a power grid fault detection device provided in Embodiment 4 of the present invention.

[0110] like Figure 4 As shown, the device comprises:

[0111] The file acquisition module 410 is used to acquire the waveform recording file corresponding to the line to be detected; wherein the line to be detected refers to the line where a fault occurs in the power grid;

[0112] A fault determination module 420 is used to determine the fault type of the initial fault of the line to be detected based on the three-phase voltage and current information of the line to be detected before the fault occurs in the recording file, and the three-phase voltage and current information of the line to be detected after the fault occurs, wherein the initial fault refers to the fault of the line to be detected that occurs for the first time in the current detection cycle, and the fault type includes a single-phase grounding fault and a two-phase grounding fault;

[0113] The line detection module 430 detects whether there is a target fault in the line to be detected based on the fault type of the initial fault, the three-phase voltage and current information of the line to be detected before the fault occurs, and the three-phase voltage and current information of the line to be detected before the fault is removed, wherein the target fault refers to a developing fault in the power grid.

[0114] The technical solution of the embodiment of the present invention determines whether there is a developmental fault in the line to be detected based on the three-phase voltage and current information of the line to be detected before a fault occurs, the three-phase voltage and current information of the line to be detected after a fault occurs, and the three-phase voltage and current information of the line to be detected before the fault is removed, without the need for complex logical operations, thereby reducing the detection cost and the configuration requirements for the detection device, and realizing timely discovery of the developmental fault in the line to be detected, thereby ensuring the correctness of the response action of the protection device in the power grid, and improving the safety of the power grid operation.

[0115] Optionally, the fault determination module 420 includes:

[0116] A first fault information acquisition unit is used to acquire the first three-phase voltage and current information of the line to be detected in the recording file in a preset acquisition period before the initial fault occurs, and the second three-phase voltage and current information of the line to be detected in a preset acquisition period after the initial fault occurs; wherein the acquisition period is the acquisition frequency of the three-phase voltage and current information;

[0117] A first fault component determination unit, configured to determine fault component current information and fault component voltage information of each phase of the line to be detected after an initial fault occurs according to the first three-phase voltage and current information and the second three-phase voltage and current information;

[0118] A first fault component power determination unit, configured to determine the fault component active power and the fault component reactive power of each phase of the line to be detected after an initial fault occurs, respectively, according to the fault component current information and the fault component voltage information;

[0119] The initial fault type determination unit is used to determine the fault type of the initial fault of the line to be detected according to the active power of the fault component and the reactive power of the fault component.

[0120] Optionally, the initial fault type determination unit can be specifically used to: determine the ratio of active power of fault components between phases, or the ratio of reactive power of fault components, and if a fault type threshold is met, then the fault type corresponding to the fault type threshold is used as the type of initial fault.

[0121] Optionally, the line detection module 430 includes:

[0122] A second fault information acquisition unit is used to acquire, when the initial fault type is a single-phase grounding fault, the first three-phase voltage and current information of the line to be detected in the recording file in a preset collection period before the initial fault occurs, and the third three-phase voltage and current information of the line to be detected in a preset collection period before the initial fault is removed;

[0123] A second fault component determination unit, configured to determine the fault component current information and the fault component voltage information of each phase of the line to be detected before the initial fault is removed according to the first three-phase voltage and current information and the third three-phase voltage and current information;

[0124] A second fault component power determination unit, used to determine the fault component active power and the fault component reactive power of each phase of the line to be detected before the initial fault is removed, according to the fault component current information and the fault component voltage information;

[0125] The target fault determination unit is used to determine whether a target fault occurs in the line to be detected after the initial fault is removed according to the active power of the fault component and the reactive power of the fault component.

[0126] Optionally, the target fault determination unit can be specifically used to: determine whether the ratio of the active power of the fault components between each phase, or the ratio of the reactive power of the fault components, meets the fault type threshold corresponding to the two-phase grounding fault; if so, determine that the target fault occurs in the line to be detected.

[0127] Optionally, the recording file records the three-phase voltage and current information of the line to be detected, the switch quantity channel information and the electrical quantity channel information of the line to be detected.

[0128] The power grid fault detection device provided in the embodiment of the present invention can execute the power grid fault detection method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0129] Embodiment 5

[0130] Figure 5 A schematic diagram of an electronic device 510 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0131] like Figure 5As shown, the electronic device 510 includes at least one processor 511, and a memory connected to the at least one processor 511 in communication, such as a read-only memory (ROM) 512, a random access memory (RAM) 513, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 511 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 512 or the computer program loaded from the storage unit 518 to the random access memory (RAM) 513. In the RAM 513, various programs and data required for the operation of the electronic device 510 can also be stored. The processor 511, the ROM 512, and the RAM 513 are connected to each other via a bus 514. An input / output (I / O) interface 515 is also connected to the bus 514.

[0132] A number of components in the electronic device 510 are connected to the I / O interface 515, including: an input unit 516, such as a keyboard, a mouse, etc.; an output unit 517, such as various types of displays, speakers, etc.; a storage unit 518, such as a disk, an optical disk, etc.; and a communication unit 519, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 519 allows the electronic device 510 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0133] The processor 511 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 511 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 511 performs the various methods and processes described above, such as a power grid fault detection method.

[0134] In some embodiments, the power grid fault detection method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 518. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 510 via the ROM 512 and / or the communication unit 519. When the computer program is loaded into the RAM 513 and executed by the processor 511, one or more steps of the power grid fault detection method described above may be performed. Alternatively, in other embodiments, the processor 511 may be configured to perform the power grid fault detection method in any other appropriate manner (e.g., by means of firmware).

[0135] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0136] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0137] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0138] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0139] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0140] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0141] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0142] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power grid fault detection method, characterized in that: include: Obtaining a recording file corresponding to a line to be detected; wherein the line to be detected refers to a line where a fault occurs in a power grid; Based on the three-phase voltage and current information of the line to be detected before the fault occurs in the recording file, and the three-phase voltage and current information of the line to be detected after the fault occurs, determine the fault type of the initial fault of the line to be detected; wherein the initial fault refers to the fault that occurs for the first time in the current detection cycle of the line to be detected, and the fault type includes a single-phase grounding fault and a two-phase grounding fault; Based on the fault type of the initial fault, the three-phase voltage and current information of the line to be detected before the fault occurs, and the three-phase voltage and current information of the line to be detected before the fault is removed, detect whether the line to be detected has a target fault; wherein the target fault refers to a developing fault in the power grid.

2. The method according to claim 1, characterized in that Determining the fault type of the initial fault of the line to be detected based on the three-phase voltage and current information of the line to be detected before the fault occurs in the recording file and the three-phase voltage and current information of the line to be detected after the fault occurs, including: Acquire the first three-phase voltage and current information of the line to be detected in the waveform recording file in a preset collection period before the initial fault occurs, and the second three-phase voltage and current information of the line to be detected in a preset collection period after the initial fault occurs; Determine, according to the first three-phase voltage and current information and the second three-phase voltage and current information, fault component current information and fault component voltage information of each phase of the line to be detected after an initial fault occurs; According to the fault component current information and the fault component voltage information, respectively determine the fault component active power and the fault component reactive power of each phase of the line to be detected after the initial fault occurs; The fault type of the initial fault of the line to be detected is determined according to the fault component active power and the fault component reactive power.

3. The method according to claim 2, characterized in that Determining the fault type of the initial fault of the line to be detected according to the fault component active power and the fault component reactive power includes: The ratio of the active power of the fault components between the phases, or the ratio of the reactive power of the fault components, is determined. If a fault type threshold is satisfied, the fault type corresponding to the fault type threshold is used as the fault type of the initial fault.

4. The method according to claim 1, characterized in that: Based on the fault type of the initial fault, the three-phase voltage and current information of the line to be detected before the fault occurs, and the three-phase voltage and current information of the line to be detected before the fault is removed, detecting whether the line to be detected has a target fault, including: In the case where the fault type of the initial fault is a single-phase grounding fault, obtaining the first three-phase voltage and current information of the line to be detected in the recording file in a preset collection period before the initial fault occurs, and the third three-phase voltage and current information of the line to be detected in a preset collection period before the initial fault is removed; Determine the fault component current information and the fault component voltage information of each phase of the line to be detected before the initial fault is removed according to the first three-phase voltage and current information and the third three-phase voltage and current information; According to the fault component current information and the fault component voltage information, respectively determine the fault component active power and the fault component reactive power of each phase of the line to be detected before the initial fault is removed; According to the active power of the fault component and the reactive power of the fault component, it is determined whether a target fault occurs in the line to be detected after the initial fault is removed.

5. The method according to claim 4, characterized in that Determining whether a target fault occurs in the line to be detected after the initial fault is removed according to the active power of the fault component and the reactive power of the fault component, including: Determine whether a ratio of active power of fault components between phases, or a ratio of reactive power of fault components, meets a fault type threshold corresponding to a two-phase grounding fault; If the conditions are met, it is determined that a target fault occurs in the line to be detected.

6. The method according to claim 1, characterized in that The recording file records the three-phase voltage and current information of the line to be detected, the switch quantity channel information and the electrical quantity channel information of the line to be detected.

7. A power grid fault detection device, characterized in that: include: A file acquisition module is used to acquire a recording file corresponding to a line to be detected; wherein the line to be detected refers to a line where a fault occurs in the power grid; A fault determination module is used to determine the fault type of the initial fault of the line to be detected based on the three-phase voltage and current information of the line to be detected before the fault occurs in the recording file, and the three-phase voltage and current information of the line to be detected after the fault occurs, wherein the initial fault refers to the fault of the line to be detected that occurs for the first time in the current detection cycle, and the fault type includes a single-phase grounding fault and a two-phase grounding fault; The line detection module detects whether there is a target fault in the line to be detected based on the fault type of the initial fault, the three-phase voltage and current information of the line to be detected before the fault occurs, and the three-phase voltage and current information of the line to be detected before the fault is removed, wherein the target fault refers to a developing fault in the power grid.

8. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can perform the power grid fault detection method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the power grid fault detection method according to any one of claims 1 to 6 when executed.

10. A computer program product, characterized in that The invention comprises a computer program, which, when executed by a processor, implements the power grid fault detection method according to any one of claims 1 to 6.

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