A power grid fault detection method, device, equipment and storage medium

Abstract

A power grid fault detection method, device and equipment and storage medium are disclosed. The power grid fault detection method comprises: obtaining a 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 three-phase voltage and current information before the to-be-detected line fails and three-phase voltage and current information after the to-be-detected line fails in the recording file; and detecting whether a target fault exists in the to-be-detected line based on the fault type of the initial fault, the three-phase voltage and current information before the to-be-detected line fails, and three-phase voltage and current information before the to-be-detected line is removed. Through the above technical solution, a developing fault 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 application relates to the technical field of relay protection, and in particular to a power grid fault detection method, device, equipment and storage medium. BACKGROUND

[0002] With the increasing complexity of the power grid system and the increasing load, the development fault problem of the power grid system is increasingly prominent. The development fault refers to the gradual evolution of the initial single-phase ground fault into a two-phase short-circuit ground fault including the phase. Such a fault often occurs in the power grid system after the fault, but if the fault development is not timely determined, the protection device in the power grid system may eventually make incorrect actions, further expanding the scope of influence.

[0003] Currently, the research and application of development faults are not deep enough, especially in how to effectively identify development faults. Therefore, there is an urgent need for a fault detection method for identifying development faults in a power system to cope with more complex and variable power grid environments in the future. SUMMARY

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

[0005] According to an aspect of the present application, a power grid fault detection method is provided, which comprises:

[0006] Obtaining a recording file corresponding to a to-be-detected line; wherein the to-be-detected line refers to a line that has occurred a fault in the power grid;

[0007] 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 recording file, determining the fault type of the initial fault of the to-be-detected line; wherein the initial fault refers to the first fault occurring in the current detection period of the to-be-detected line, and the fault type includes single-phase ground fault and two-phase ground fault;

[0008] 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, and the three-phase voltage and current information before the fault removal of the to-be-detected line, detecting whether the to-be-detected line has a target fault; wherein the target fault refers to a development fault in the power grid.

[0009] According to another aspect of the present application, a power grid fault detection device is provided, which comprises:

[0010] A file acquisition module is configured to obtain a recording file corresponding to a to-be-detected line; wherein the to-be-detected line refers to a line that has occurred a fault in the power grid;

[0011] a fault determination module configured to determine a fault type of an initial fault of the to-be-detected line based on the three-phase voltage and current information of the to-be-detected line before the fault and the three-phase voltage and current information of the to-be-detected line after the fault, wherein the initial fault refers to a fault of the to-be-detected line occurring for the first time in a current detection period, and the fault type includes a single-phase ground fault and a two-phase ground fault;

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

[0013] According to another aspect of the present application, an electronic device is provided, which comprises:

[0014] at least one processor; and

[0015] a memory connected to the at least one processor in communication; 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 to enable the at least one processor to execute the power grid fault detection method according to any one of the embodiments of the present application.

[0017] According to another aspect of the present application, a computer readable storage medium is provided, which stores computer instructions for enabling a processor to implement the power grid fault detection method according to any one of the embodiments of the present application when executed by the processor.

[0018] According to another aspect of the present application, a computer program product is provided, which comprises a computer program for implementing the power grid fault detection method according to any one of the embodiments of the present application when executed by a processor.

[0019] The technical solution of the embodiments of the present application determines whether a developing fault exists in the to-be-detected line according to the recorded three-phase voltage and current information of the to-be-detected line before the fault, the three-phase voltage and current information of the to-be-detected line after the fault, and the three-phase voltage and current information of the to-be-detected line before the fault is removed, without the need for complex logical operations, thereby reducing the detection cost and the configuration requirement for the detection device, and achieving timely discovery of the developing fault in the to-be-detected line to ensure the correctness of the response action of the protection device in the power grid and improve the safety of the power grid operation.

[0020] It is to be understood that the details set forth in the description contained herein do not limit the scope of the application. Other embodiments of the application will be readily apparent to those skilled in the art from the description herein. With reference to the drawings, embodiments of the application are herein described. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0022] Figure 1 is a flow chart of a power grid fault detection method according to an embodiment of the present application;

[0023] Figure 2 is a flow chart of a power grid fault detection method according to an embodiment of the present application;

[0024] Figure 3 is a flow chart of a power grid fault detection method according to an embodiment of the present application;

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

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

[0027] In order to make the technical personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort should be within the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and the above-described accompanying drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products, or apparatuses.

[0029] Embodiment one

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

[0031] S110, acquiring a recording file corresponding to a to-be-detected line.

[0032] The to-be-detected line can be a line in which a fault occurs in the power grid.

[0033] It should be noted that the to-be-detected line can also be a line in which there is a developing fault risk in the power grid.

[0034] In the embodiment of the present application, because it is necessary to confirm whether there is a developing fault in the to-be-detected line, the recording file corresponding to the to-be-detected line can be acquired after the fault occurring in the to-be-detected line is processed.

[0035] Optionally, in the embodiment of the present application, when the protection device, such as a relay protection device, in the to-be-detected line detects an initial fault and removes the initial fault, the protection device records the three-phase voltage and current information of at least one measuring point in the to-be-detected line within a preset collection period as a time window length, generates a recording file, and synchronously records the switch quantity channel information and the electrical quantity channel information of the to-be-detected line in the fault repair process. Optionally, the positions of the measuring points and the preset collection period can be adaptively set by those skilled in the art.

[0036] For the to-be-detected line, the electrical quantity information channel can be read according to the switch quantity channel information and the electrical quantity channel information in the recording wave file corresponding to the to-be-detected line, wavelet transform modulus maximum value processing is performed on a specific three-phase voltage and current channel, the occurrence time of the initial fault in the to-be-detected line is determined by comparison, and the breaker action time is determined as the removal time of the initial fault by reading the switch quantity channel information.

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

[0038] In S120, the fault type of the initial fault of the to-be-detected line is determined 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.

[0039] The initial fault can refer to a fault of the to-be-detected line occurring for the first time in a current detection period, and the fault type can include a single-phase ground fault and a two-phase ground fault. It should be noted that the fault of the to-be-detected line occurring for the first time in the current detection period can refer to a fault before the to-be-detected line develops, and each phase has one corresponding single-phase ground fault type and two corresponding two-phase ground fault types.

[0040] Specifically, in the embodiment of the application, fast Fourier transform can be performed 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 to obtain the voltage fundamental component and the current fundamental component of each phase before the fault of the to-be-detected line and the voltage fundamental component and the current fundamental component after the fault of the to-be-detected line, and the fault type of the fault of the to-be-detected line is determined according to the information obtained after the fast Fourier transform.

[0041] In S130, whether a target fault exists in the to-be-detected line is detected 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, and the three-phase voltage and current information before the fault removal of the to-be-detected line.

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

[0043] Specifically, after determining the fault type of the initial fault, the three-phase voltage and current information before the fault of the to-be-detected line and the three-phase voltage and current information before the fault removal of the to-be-detected line can be subjected to fast Fourier transform to obtain the voltage fundamental component and the current fundamental component of each phase before the fault of the to-be-detected line and the voltage fundamental component and the current fundamental component before the fault removal of the to-be-detected line, and the to-be-detected line is detected according to the voltage fundamental component and the current fundamental component of each phase before the fault of the to-be-detected line and the voltage fundamental component and the current fundamental component before the fault removal of the to-be-detected line to determine whether there is a developing fault; in the case of a developing fault, a fault warning is issued to prompt the fault type of the developing fault.

[0044] The technical scheme of the embodiment of the application determines whether there is a developing fault in the to-be-detected line according to the recorded three-phase voltage and current information before the fault of the to-be-detected line, the three-phase voltage and current information after the fault of the to-be-detected line, and the three-phase voltage and current information before the fault removal of the to-be-detected line in the recording file, without the need for complex logical operations, reduces the detection cost and the configuration requirement for the detection device, and realizes timely discovery of the developing fault in the to-be-detected line to ensure the correctness of the response action of the protection device in the power grid and improve the safety of power grid operation.

[0045] Embodiment two

[0046] Figure 2 A flowchart of a power grid fault detection method provided by the embodiment two of the application, the embodiment further refines the above-mentioned embodiment, and provides specific steps of determining the fault type of the 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 recording file. It should be noted that the unexplained parts of the embodiment of the application can refer to the related descriptions of other embodiments, which will not be described here. As shown in the embodiment, Figure 2 The method comprises:

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

[0048] S220, determining fault component current information and fault component voltage information of each phase of the to-be-detected line after the initial fault according to the first three-phase voltage and current information and the second three-phase voltage and current information.

[0049] In the embodiment of the present application, in order to obtain the voltage and current information of different states before and after the initial fault occurs, the first three-phase voltage and current information of a preset acquisition period before the initial fault occurs and the second three-phase voltage and current information of a preset acquisition period after the initial fault occurs can be obtained, and the first three-phase voltage and current information and the second three-phase voltage and current information are subjected to fast Fourier transform, the voltage fundamental component and the current fundamental component corresponding to the first three-phase voltage and current information and the voltage fundamental component and the current fundamental component corresponding to the second three-phase voltage and current information are obtained, and the voltage fundamental component and the current fundamental component corresponding to the first three-phase voltage and current information and the voltage fundamental component and the current fundamental component corresponding to the second three-phase voltage and current information are used to determine the fault component current information and the fault component voltage information of each phase of the line to be detected after the initial fault occurs.

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

[0051]

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

[0056] S230, determining a fault component active power and a fault component reactive power of each phase of the line to be detected after the initial fault according to the fault component current information and the fault component voltage information.

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

[0058]

[0059] wherein, 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, and Re is an active power function.

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

[0061]

[0062] wherein, 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, and Im is a reactive power function.

[0063] S240, determining a 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.

[0064] Optionally, 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 comprises: determining a ratio of the fault component active power or a ratio of the fault component reactive power between the phases, and if the ratio meets a fault type threshold value, taking the fault type corresponding to the fault type threshold value as the fault type of the initial fault.

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

[0066]

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

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

[0069]

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

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

[0072] In the embodiment of the present application, in the ideal state of the 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 the power grid fails, the fault component power calculated by the non-fault phase will have a certain numerical fluctuation and will not necessarily be 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 single-phase ground fault, the fault detection of the to-be-detected line is continued to determine whether the to-be-detected line has a developing fault. For example, as shown in Table 1, if k1, k2 and k3 all satisfy the range of the corresponding parameter threshold, or j1, j2 and j3 all satisfy the range of the corresponding parameter threshold, it can be indicated that the fault type of the initial fault is A-phase ground fault (AG). Optionally, M and N are both numbers greater than 1, the fault active parameter threshold and the fault reactive parameter threshold can be adaptively set by those skilled in the art, and the parameter threshold range corresponding to the fault type is different for different fault types.

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

[0075] Table 1

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

[0079] The technical scheme of the embodiment of the present application detects the fault type based on the three-phase current and voltage information in the recording wave file, eliminates the influence of complex power grid factors, and can accurately detect the fault type of the fault, regardless of the location of the fault or the fault type, thereby improving the detection efficiency.

[0080] Embodiment three

[0081] Figure 3 A flowchart of a power grid fault detection method provided by the third embodiment of the present application, which is further refined on the basis of the above-mentioned embodiments, provides specific steps of detecting whether the target fault exists in the to-be-detected line 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, and the three-phase voltage and current information before the fault of the to-be-detected line is removed. It should be noted that the unexplained parts of the embodiment of the present application can be referred to the related description of other embodiments, which will not be described here. As shown in the figure, the method comprises: Figure 3

[0082] S310, in the case where the fault type of the initial fault is single-phase ground fault, the first three-phase voltage and current information of the to-be-detected line in a preset collection period before the initial fault occurs and the third three-phase voltage and current information of the to-be-detected line in a preset collection period before the initial fault is removed are obtained from the recording wave file.

[0083] In the embodiment of the present application, in order to obtain the voltage and current information during the occurrence of the initial fault and the removal of the initial fault, the first three-phase voltage and current information of the to-be-detected line in a preset collection period before the occurrence of the initial fault and the third three-phase voltage and current information of the to-be-detected line in a preset collection period before the removal of the initial fault are obtained, and the first three-phase voltage and current information and the third three-phase voltage and current information are subjected to fast Fourier transform, the voltage fundamental component and the current fundamental component corresponding to the first three-phase voltage and current information and the voltage fundamental component and the current fundamental component corresponding to the third three-phase voltage and current information are obtained, and the fault component current information and the fault component voltage information of each phase of the to-be-detected line before the removal of the initial fault are determined according to the voltage fundamental component and the current fundamental component corresponding to the first three-phase voltage and current information and the voltage fundamental component and the current fundamental component corresponding to the third three-phase voltage and current information.

[0084] ​S320, determining 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, determining 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 respectively.

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

[0087]

[0088] wherein, is the fault component voltage information of the A phase, is the fault component voltage information of the B phase, is the fault component voltage information of the C phase, is the voltage fundamental component of the A phase corresponding to the third three-phase voltage and current information, is the voltage fundamental component of the A phase corresponding to the first three-phase voltage and current information, is the voltage fundamental component of the B phase corresponding to the third three-phase voltage and current information, is the voltage fundamental component of the B phase corresponding to the first three-phase voltage and current information, is the voltage fundamental component of the C phase corresponding to the third three-phase voltage and current information, is the voltage fundamental component of the C phase 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] wherein, is the fault component current information of the A phase, is the fault component current information of the B phase, is the fault component current information of the C phase, is the current fundamental component of the A phase corresponding to the third three-phase voltage and current information, is the current fundamental component of the A phase corresponding to the first three-phase voltage and current information, is the current fundamental component of the B phase corresponding to the third three-phase voltage and current information, is the current fundamental component of the B phase corresponding to the first three-phase voltage and current information, is the current fundamental component of the C phase corresponding to the third three-phase voltage and current information. is the fundamental component of the current 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 removal can be determined by the following formula:

[0093]

[0094] wherein 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 removal, and Re is the active power function.

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

[0096]

[0097] wherein 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 removal, and Im is the reactive power function.

[0098] S340, determining whether the target fault occurs in the line to be detected after the initial fault removal according to the fault component active power and the fault component reactive power.

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

[0100]

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

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

[0103]

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

[0105] Optionally, determining whether the target fault occurs in the line to be detected after the initial fault removal according to the fault component active power and the fault component reactive power includes: determining whether the ratio of the fault component active power or the ratio of the fault component reactive power between the phases meets the fault type threshold corresponding to the two-phase ground fault; and if so, determining that the target fault occurs in the line to be detected.

[0106] Specifically, by determining that the ratio of the fault component active power or the ratio of the fault component reactive power between each phase of the to-be-detected line before the initial fault is removed satisfies the parameter threshold corresponding to the fault type of the two-phase ground fault, it is determined that the to-be-detected line has developed a fault, and a fault warning is issued to prompt that the to-be-detected line has a two-phase ground fault and the specific fault type.

[0107] The technical scheme of the embodiment of the application determines whether a developing fault exists in the to-be-detected line according to the recorded three-phase voltage and current information of the to-be-detected line before the fault, the three-phase voltage and current information of the to-be-detected line after the fault, and the three-phase voltage and current information of the to-be-detected line before the fault is removed, without complex logical operations, reducing the detection cost and the configuration requirements for the detection device, and realizing timely detection of the developing fault in the to-be-detected line to ensure the correctness of the response action of the protection device in the power grid and improve the safety of the power grid operation. Moreover, the fault component active power and the fault component reactive power generated based on the three-phase voltage and current information are used for fault detection, eliminating the influence of the transition resistance in the power grid and improving the resistance tolerance in the fault detection process.

[0108] Embodiment four

[0109] Figure 4 A structural schematic diagram of a power grid fault detection device provided by the fourth embodiment of the application.

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

[0111] A file acquisition module 410 is configured to acquire a recording file corresponding to a to-be-detected line; wherein the to-be-detected line refers to a line that has a fault in the power grid;

[0112] A fault determination module 420 is configured to determine the fault type of an initial fault of the to-be-detected line based on the three-phase voltage and current information of the to-be-detected line before the fault and the three-phase voltage and current information of the to-be-detected line after the fault in the recording file; wherein the initial fault refers to the first fault of the to-be-detected line in the current detection period, and the fault type includes a single-phase ground fault and a two-phase ground fault;

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

[0114] The technical scheme of the embodiment of the present application determines whether a developing fault exists in the to-be-detected line according to the recorded three-phase voltage and current information before the fault of the to-be-detected line, the recorded three-phase voltage and current information after the fault of the to-be-detected line, and the recorded three-phase voltage and current information before the fault of the to-be-detected line is removed, without complex logical operation, reduces the detection cost and the configuration requirement of the detection device, and realizes timely discovery of the developing fault in the to-be-detected line, so as to ensure the correctness of the response action of the protection device in the power grid and improve the safety of the power grid operation.

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

[0116] a first fault information acquisition unit, configured to acquire first three-phase voltage and current information of the to-be-detected line in a preset acquisition period before the initial fault occurs and second three-phase voltage and current information of the to-be-detected line in the preset acquisition period after the initial fault occurs; wherein the acquisition period is an acquisition frequency of acquiring 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 to-be-detected line after the 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 fault component active power and fault component reactive power of each phase of the to-be-detected line after the initial fault occurs according to the fault component current information and the fault component voltage information, respectively;

[0119] an initial fault type determination unit, configured to determine a fault type of the initial fault of the to-be-detected line according to the fault component active power and the fault component reactive power.

[0120] Optionally, the initial fault type determination unit can be specifically configured to: determine a ratio of the fault component active power or a ratio of the fault component reactive power between phases, and if the ratio meets a fault type threshold value, the fault type corresponding to the fault type threshold value is taken as the type of the initial fault.

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

[0122] a second fault information acquisition unit, configured to acquire first three-phase voltage and current information of the to-be-detected line in a preset acquisition period before the initial fault occurs and third three-phase voltage and current information of the to-be-detected line in a preset acquisition period before the initial fault is removed in the case that the initial fault type is a single-phase ground fault;

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

[0124] a second fault component power determining unit, configured to determine, according to the fault component current information and the fault component voltage information, fault component active power and fault component reactive power of each phase of the to-be-detected line before initial fault removal, respectively;

[0125] a target fault determining unit, configured to determine, according to the fault component active power and the fault component reactive power, whether a target fault occurs in the to-be-detected line after initial fault removal.

[0126] Optionally, the target fault determining unit can be specifically configured to determine whether a ratio of the fault component active power or a ratio of the fault component reactive power between phases meets a fault type threshold corresponding to two-phase ground fault; if yes, it is determined that the to-be-detected line has a target fault.

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

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

[0129] Embodiment five

[0130] Figure 5 A structural schematic diagram of an electronic device 510 that can be used to implement embodiments of the present application is shown. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular telephones, smart phones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not intended to limit the implementations of the present application described and / or claimed in this document.

[0131] As Figure 5As shown, the electronic device 510 includes at least one processor 511, and a memory, such as a read-only memory (ROM) 512, a random access memory (RAM) 513, and the like, connected to the at least one processor 511 in communication. The memory stores a computer program executable by the at least one processor 511, 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 loaded into the random access memory (RAM) 513 from the storage unit 518. 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 through a bus 514. An input / output (I / O) interface 515 is also connected to the bus 514.

[0132] A plurality 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, and the like, an output unit 517, such as various types of displays, a speaker, and the like, a storage unit 518, such as a magnetic disk, an optical disk, and the like, and a communication unit 519, such as a network card, a modem, a wireless communication transceiver, and the like. 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 can be various general-purpose and / or special-purpose processing components having 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 specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, and the like. The processor 511 performs various methods and processes described above, such as the power grid fault detection method.

[0134] In some embodiments, the power grid fault detection method can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 518. In some embodiments, part or all of the computer program can be loaded and / or installed onto 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 can be performed. Alternatively, in other embodiments, the processor 511 can be configured to perform the power grid fault detection method by any other appropriate means, such as by means of firmware.

[0135] The various embodiments of the systems and techniques described above can be implemented in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a complex programmable logic device (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0136] Computer programs used to implement the processes of the application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer program

[0137] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store computer programs for use by or in connection with an instruction execution system, apparatus, or device. Computer-readable storage media can include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium will include one or more lines of electrical connections, portable computer disks, hard disk drives, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or Flash memory), optical fibers, portable compact disc read-only memories (CD-ROMs), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0138] To provide for interaction with a user, the systems and techniques described here can 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 a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0139] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can 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] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. A server can 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 large management difficulty and weak business scalability in traditional physical host and VPS service.

[0141] It should be understood that the various forms of flow shown above can be re-ordered, added to, or deleted from without departing from the scope of the present disclosure. For example, the steps recited in the present disclosure can be executed in parallel, executed in sequence, or executed in a different order, as long as the desired results of the present disclosure are achieved, and the present disclosure is not limited herein.

[0142] The specific embodiments described above are not intended to be limiting, and persons skilled in the art will appreciate that various modifications, combinations, sub-combinations and alternatives can be made to the specific embodiments without departing from the spirit and principles of the disclosure. Accordingly, the disclosure is not limited to the specific embodiments described above, but only by the scope of the appended claims.

Claims

1. A method for detecting power grid faults, characterized in that, include: Obtain the waveform recording file corresponding to the line to be tested; wherein, the line to be tested refers to the line where a fault has occurred in the power grid; Based on the three-phase voltage and current information of the line under test before the fault occurs in the waveform file, and the three-phase voltage and current information of the line under test after the fault occurs, the fault type of the initial fault of the line under test is determined; wherein, the initial fault refers to the first fault that occurs in the line under test in the current detection cycle, and the fault type includes single-phase grounding fault and two-phase grounding fault. Based on the fault type of the initial fault, the three-phase voltage and current information of the line under test before the fault occurred, and the three-phase voltage and current information of the line under test before the fault was cleared, it is detected whether there is a target fault in the line under test; whereby, the target fault refers to a developing fault in the power grid. Specifically, based on the three-phase voltage and current information of the line under test before the fault occurred in the waveform recording file, and the three-phase voltage and current information of the line under test after the fault occurred, the fault type of the initial fault of the line under test is determined, including: Obtain the first three-phase voltage and current information of the line under test in the waveform recording file before the initial fault occurs, and the second three-phase voltage and current information of the line under test after the initial fault occurs, within a preset acquisition period. 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 fault component voltage information of each phase of the line under test are determined after the initial fault occurs. Based on the fault component current information and the fault component voltage information, the active power and reactive power of the fault component of each phase of the line under test after the initial fault occurs are determined respectively. The fault type of the initial fault of the line under test is determined based on the active power and reactive power of the fault component.

2. The method according to claim 1, characterized in that, Based on the active power and reactive power of the fault component, the fault type of the initial fault of the line under test is determined, including: If the ratio of the active power of the fault component or the ratio of the reactive power of the fault component between each phase is determined, and a fault type threshold is satisfied, then the fault type corresponding to the fault type threshold is taken as the initial fault type.

3. 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 under test before the fault occurred, and the three-phase voltage and current information of the line under test before the fault was cleared, the detection of whether the line under test has a target fault includes: When the initial fault type is a single-phase ground fault, the first three-phase voltage and current information of the line under test in the waveform file before the initial fault occurs and the third three-phase voltage and current information of the line under test before the initial fault is cleared are obtained. Based on the first three-phase voltage and current information and the third three-phase voltage and current information, the fault component current information and fault component voltage information of each phase of the line under test before the initial fault clearance are determined. Based on the fault component current information and the fault component voltage information, the active power and reactive power of the fault component of each phase of the line under test before the initial fault clearance are determined respectively. Based on the active power and reactive power of the fault component, determine whether the target fault occurred in the line under test after the initial fault was cleared.

4. The method according to claim 3, characterized in that, Based on the active power and reactive power of the fault component, determine whether the target fault occurred in the line under test after the initial fault was cleared, including: Determine whether the ratio of the active power of the fault component or the ratio of the reactive power of the fault component between each phase meets the fault type threshold corresponding to a two-phase ground fault. If the conditions are met, then the line under test is determined to have a target fault.

5. The method according to claim 1, characterized in that, The waveform recording file contains the three-phase voltage and current information of the circuit under test, the switching channel information of the circuit under test, and the electrical quantity channel information.

6. A power grid fault detection device, characterized in that, include: The file acquisition module is used to acquire the waveform file corresponding to the line to be tested; wherein, the line to be tested refers to the line where a fault has occurred in the power grid; The fault determination module is used to determine the fault type of the initial fault of the line under test based on the three-phase voltage and current information of the line under test before the fault occurs in the waveform file and the three-phase voltage and current information of the line under test after the fault occurs; wherein, the initial fault refers to the first fault that occurs in the line under test in the current detection cycle, and the fault type includes single-phase grounding fault and two-phase grounding fault. The line detection module detects whether a target fault exists in the line under test based on the fault type of the initial fault, the three-phase voltage and current information of the line under test before the fault occurs, and the three-phase voltage and current information of the line under test before the fault is cleared; wherein, the target fault refers to a developing fault in the power grid. The fault determination module includes: The first fault information acquisition unit is used to acquire the first three-phase voltage and current information of the line under test in the waveform recording file before the initial fault occurs, and the second three-phase voltage and current information of the line under test after the initial fault occurs, with a preset acquisition period; wherein, the acquisition period is the acquisition frequency of the three-phase voltage and current information. The first fault component determination unit is used to determine the fault component current information and fault component voltage information of each phase of the line under test after the initial fault occurs, based on the first three-phase voltage and current information and the second three-phase voltage and current information. The first fault component power determination unit is used to determine the active power and reactive power of the fault component of each phase of the line under test after the initial fault occurs, based on the fault component current information and the fault component voltage information. The initial fault type determination unit is used to determine the fault type of the initial fault of the line under test based on the active power and reactive power of the fault component.

7. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the power grid fault detection method according to any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the power grid fault detection method according to any one of claims 1-5.

9. A computer program product, characterized in that, It includes a computer program that, when executed by a processor, implements the power grid fault detection method according to any one of claims 1-5.

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