Power grid fault equipment positioning method, equipment and storage medium

Abstract

The invention discloses a power grid fault equipment positioning method and device and a storage medium, and the method comprises the steps: collecting a wave recording file collected by a power grid for primary electrical equipment which triggers a protection action event when the power grid is monitored to start the protection action event; determining the fault of the power grid according to the recording file; positioning a first weight of a fault of one electrical secondary device in the power grid according to the protection action event; positioning a second weight of a fault of the primary electrical equipment in the power grid in the power direction according to the wave recording file; positioning a third weight of a fault of the primary electrical equipment in the power grid in the differential current direction according to the wave recording file; and according to the first weight, the second weight and the third weight, positioning the primary electrical equipment with the fault in the power grid. According to the embodiment, the primary electrical equipment with the fault of the power grid is comprehensively positioned from the dimensions of protection action events, power, differential current and the like, the judgment efficiency and accuracy of the power grid fault can be effectively improved, the accident power failure time is shortened, and the safe operation level of the power grid is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grids, and in particular to a method, a device and a storage medium for locating faulty power grid equipment. Background Art

[0002] To meet the growing demand for electricity, the scale of the power grid continues to expand, and the probability of power grid failure also increases. After a failure occurs, it is necessary to quickly locate the faulty equipment in order to restore power supply as soon as possible.

[0003] At present, the process of power grid fault analysis and location is mostly done manually. Part of the work can be assisted by waveform analysis tools. The overall efficiency is low, the technical level of personnel is high, and analysis errors are prone to occur. Summary of the invention

[0004] In view of this, the present invention provides a method, a device and a storage medium for locating faulty equipment in a power grid, so as to improve the efficiency of locating faults in the power grid.

[0005] A first aspect of the present invention provides a method for locating a faulty device in a power grid, comprising:

[0006] When monitoring the power grid to initiate a protection action event, collect the recording file of the power grid collecting the primary electrical equipment that triggers the protection action event;

[0007] Determining the occurrence of a fault in the power grid according to the recording file;

[0008] Locating a first weight of a fault of an electrical secondary device in the power grid according to the protection action event;

[0009] Locating a second weight of a fault in a primary electrical device in the power grid in a power direction according to the wave recording file;

[0010] Locating a third weight of a fault in a primary electrical device in the power grid in a differential current direction according to the wave recording file;

[0011] A primary electrical device having a fault in the power grid is located according to the first weight, the second weight, and the third weight.

[0012] A second aspect of the present invention provides a device for locating a faulty power grid device, comprising:

[0013] A protection data collection module is used to collect the recording files of the primary electrical equipment that triggers the protection action event collected by the power grid when monitoring the power grid to start the protection action event;

[0014] A fault determination module, used for determining the occurrence of a fault in the power grid according to the recording file;

[0015] A first weight positioning module, used for positioning a first weight of a fault of an electrical secondary device in the power grid according to the protection action event;

[0016] A second weight positioning module, used for positioning a second weight of a fault of a primary electrical device in the power grid in a power direction according to the recording file;

[0017] A third weight positioning module, used for positioning the third weight of the primary electrical equipment failure in the power grid in the differential current direction according to the recording file;

[0018] A fault locating module is used to locate a primary electrical device having a fault in the power grid according to the first weight, the second weight and the third weight.

[0019] A third aspect of the present invention provides an electronic device, the electronic device comprising:

[0020] at least one processor; and

[0021] a memory communicatively connected to the at least one processor; wherein,

[0022] 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 method for locating fault equipment in the power grid as described in the first aspect above.

[0023] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the method for locating faulty equipment in a power grid as described in the first aspect above.

[0024] A fifth aspect of the present invention provides a computer program product, the computer program product comprising a computer program, and when the computer program is executed by a processor, the method for locating faulty equipment in a power grid as described in the first aspect above is implemented.

[0025] In this embodiment, when monitoring the power grid to initiate a protection action event, collect the recording files collected by the power grid on the primary electrical equipment that triggers the protection action event; determine the occurrence of a fault in the power grid based on the recording files; locate the first weight of a fault in a secondary electrical equipment in the power grid based on the protection action event; locate the second weight of a fault in a primary electrical equipment in the power grid in the power direction based on the recording files; locate the third weight of a fault in a primary electrical equipment in the power grid in the differential current direction based on the recording files; locate the primary electrical equipment that has failed in the power grid based on the first weight, the second weight, and the third weight. This embodiment comprehensively locates the primary electrical equipment that has failed in the power grid from the dimensions of protection action events, power, differential current, etc., which can effectively improve the judgment efficiency and accuracy of power grid faults, reduce the time of accidental power outages, reduce the losses caused by power outages, and improve the safe operation level of the power grid.

[0026] 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

[0027] 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.

[0028] Figure 1 This is a flow chart of a method for locating faulty equipment in a power grid provided in Example 1 of the present invention.

[0029] Figure 2 It is a structural schematic diagram of a power grid fault equipment locating device provided in Embodiment 2 of the present invention.

[0030] Figure 3 It is a structural schematic diagram of an electronic device provided in Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0031] 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.

[0032] 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 interchangeable where appropriate, so that the embodiments of the present invention described herein can cover sequential implementations 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.

[0033] Embodiment 1

[0034] See also Figure 1 , shows a flow chart of a method for locating a power grid fault device provided by the first embodiment of the present invention, the method can be executed by a power grid fault device locating device, the power grid fault device locating device can be implemented in the form of hardware and / or software, and the power grid fault device locating device can be configured in an electronic device. Figure 1 As shown, the method includes:

[0035] Step 101 : when monitoring a power grid protection action event, collect a recording file of the power grid's primary electrical equipment that triggers the protection action event.

[0036] In this embodiment, it is possible to continuously monitor whether a protection action event is initiated in the power grid. If the power grid is monitored to initiate a protection action event, sensors can be called to collect recording files of a preset duration (such as 30 seconds) of the power grid's collection of each primary electrical device that triggers the protection action event.

[0037] In the power grid, primary electrical equipment refers to high-voltage electrical equipment directly used in the production process of producing, transmitting and distributing electric energy, including generators, transformers, circuit breakers, disconnectors, automatic switches, contactors, knife switches, busbars, transmission lines, power cables, reactors, motors, etc.

[0038] Step 102: Determine whether a power grid fault has occurred based on the recording file.

[0039] In practical applications, the data in the recording file can be analyzed to determine the occurrence of power grid failures at a macro level.

[0040] In one embodiment of the present invention, step 102 may include the following steps:

[0041] Step 1021: Determine the starting point of the protection action event in the recording file.

[0042] In this embodiment, the time point of the protection action start event can be parsed in the recording file and used as the start point.

[0043] Step 1022, reading the first effective voltage value of the cycle data before the start point, the second effective voltage value of the cycle data after the start point, the first zero-sequence voltage of the cycle data after the start point, and the first negative-sequence voltage of the cycle data after the start point in the voltage channel of the recording file.

[0044] When determining the starting point, the first effective voltage value Uk of the cycle data before the starting point, the second effective voltage value Un of the cycle data after the starting point, the first zero-sequence voltage U0 of the cycle data after the starting point and the first negative-sequence voltage U2 of the cycle data after the starting point can be read respectively under the voltage channel of the recording file.

[0045] Step 1023, reading the first current effective value of the cycle data before the start point, the second current effective value of the cycle data after the start point, the first zero-sequence current of the cycle data after the start point, and the first negative-sequence current of the cycle data after the start point in the current channel of the recording file.

[0046] When determining the starting point, the first current effective value Ik of the cycle data before the starting point, the second current effective value In of the cycle data after the starting point, the first zero-sequence current I0 of the cycle data after the starting point, and the first negative-sequence current I2 of the cycle data after the starting point can be read respectively under the current channel of the recording file.

[0047] Step 1024: Subtract the second voltage effective value from the first voltage effective value to obtain the voltage mutation amount of the voltage channel.

[0048] In this embodiment, the voltage mutation amount ΔU of the voltage channel can be obtained by subtracting the second voltage effective value Un from the first voltage effective value Uk, that is, ΔU=Uk-Un.

[0049] Step 1025: Generate a voltage mutation threshold according to the first zero-sequence voltage and the first negative-sequence voltage.

[0050] In this embodiment, the voltage mutation threshold may be generated for the voltage channel with reference to the first zero-sequence voltage U0 and the first negative-sequence voltage U2.

[0051] In one design, the largest one between the first zero-sequence voltage U0 and the first negative-sequence voltage U2 is taken as the unbalanced voltage △UT, that is, when the first zero-sequence voltage U0 is greater than the first negative-sequence voltage U2, the first zero-sequence voltage U0 is set to the unbalanced voltage △UT, and when the first zero-sequence voltage U0 is less than the first negative-sequence voltage U2, the first negative-sequence voltage U2 is set to the unbalanced voltage △UT.

[0052] Query the rated voltage UN set for the voltage channel, where the rated voltage UN is an empirical value.

[0053] The voltage mutation threshold is obtained by adding the product of the unbalanced voltage and a preset voltage amplification factor (the voltage amplification factor is greater than 1) to the product of the rated voltage and a preset voltage reduction factor (the voltage reduction factor is less than 1).

[0054] Exemplarily, assuming that the voltage amplification factor is 1.25 and the voltage reduction factor is 0.05, the voltage mutation threshold can be expressed as: △UT+0.05UN=1.25Max(U0,U2)+0.05UN.

[0055] Step 1026: Subtract the second current effective value from the first current effective value to obtain the current mutation amount of the current channel.

[0056] In this embodiment, the current mutation amount In of the current channel can be obtained by subtracting the second current effective value In from the first current effective value Ik, that is, ΔI=Ik-In.

[0057] Step 1027: Generate a current mutation threshold according to the first zero-sequence current I0 and the first negative-sequence current I2.

[0058] In this embodiment, the voltage mutation threshold may be generated for the current channel with reference to the first zero-sequence current I0 and the first negative-sequence current I2.

[0059] In one design, the largest one between the first zero-sequence current I0 and the first negative-sequence current I2 is taken as the unbalanced current △IT, that is, when the first zero-sequence current I0 is greater than the first negative-sequence current I2, the first zero-sequence current I0 is set to the unbalanced current △IT, and when the first zero-sequence current I0 is less than the first negative-sequence current I2, the first negative-sequence current I2 is set to the unbalanced current △IT.

[0060] Query the rated current IN set for the current channel, where the rated current IN is an empirical value.

[0061] The product of the unbalanced current and a preset current amplification factor (the current amplification factor is greater than 1) is added to the product of the rated current and a preset current reduction factor (the current reduction factor is less than 1) to obtain the current mutation threshold.

[0062] Exemplarily, assuming that the current amplification factor is 1.25 and the current reduction factor is 0.05, the current mutation threshold can be expressed as: △IT+0.05IN=1.25Max(I0,I2)+0.05IN.

[0063] Step 1028: Read the common content of the second harmonic and the third harmonic in the differential current channel of the recording file.

[0064] In this embodiment, the common content of the second harmonic and the third harmonic can be read in the differential current channel of the recording file.

[0065] When the content is greater than or equal to a preset excitation inrush current threshold, it can be determined that an excitation inrush current occurs in the power grid; when the content is less than the preset excitation inrush current threshold, it can be determined that no excitation inrush current occurs in the power grid.

[0066] Step 1029: When the voltage mutation amount is greater than the voltage mutation threshold, the current mutation amount is greater than the current mutation threshold, and the content is less than the preset excitation inrush current threshold, it is determined that a power grid fault occurs.

[0067] In this embodiment, if the voltage mutation amount is greater than the voltage mutation threshold (i.e., the voltage mutation is large), the current mutation amount is greater than the current mutation threshold (i.e., the current mutation is large), and the content is less than the preset excitation inrush current threshold, it can be determined that a primary electrical equipment in the power grid has failed.

[0068] Step 103: Locate a first weight of a fault of an electrical secondary device in the power grid according to the protection action event.

[0069] In this embodiment, the first weight of a fault of an electrical secondary device in the power grid may be located in the dimension of the protection action event.

[0070] In a specific implementation, a mapping relationship between the same or multiple primary electrical devices in the power grid to which each protection action event is mapped may be established in advance.

[0071] A time window is added starting from the first protection action event, where the width of the time window is an empirical value, such as 1.5 seconds.

[0072] According to the mapping relationship, each protection action event in the time window is mapped to the primary electrical equipment in the power grid as the protection scope of the protection action event.

[0073] The frequency of occurrence of primary electrical equipment in the protection scope is set as the first weight of the failure.

[0074] Generally, the primary electrical equipment with the highest first weight is the primary electrical equipment that fails in the power grid.

[0075] Step 104: Locate the second weight of a fault in a primary electrical device in the power grid in the power direction according to the recording file.

[0076] In this embodiment, the second weight of the failure of the primary electrical equipment in the power grid can be located in the dimension of the power direction of the recording file.

[0077] In a specific implementation, the starting point of the protection action event is determined in the recording file, and the calculation point is determined within a cycle (such as 0.75 cycle) after the first starting point.

[0078] On the one hand, the positive sequence voltage U1, the second zero sequence voltage U0 and the second negative sequence voltage U2 of the wave data of one cycle before the calculation point are read under the voltage channel of the recording file.

[0079] On the other hand, the positive sequence current I1, the second zero sequence current I0 and the second negative sequence current I2 of the wave data of one cycle before the calculation point are read under the current channel of the wave recording file.

[0080] The primary electrical equipment to which the positive-sequence power is directed is identified based on the relationship between the positive-sequence voltage U1 and the positive-sequence current I1, the relationship between the second zero-sequence voltage U0 and the second zero-sequence current I0, and the relationship between the second negative-sequence voltage U2 and the second negative-sequence current I2.

[0081] In one case, if the positive-sequence current I1 leads the positive-sequence voltage U1, it is determined that the positive-sequence power is directed to the busbar to which the primary electrical equipment is connected; if the positive-sequence current I1 lags the positive-sequence voltage U1, it is determined that the positive-sequence power is directed to the primary electrical equipment.

[0082] In another case, if the second zero-sequence current I0 leads the second zero-sequence voltage U0, it is determined that the positive-sequence power is directed to the primary electrical equipment; if the second zero-sequence current I0 lags the second zero-sequence voltage U0, it is determined that the positive-sequence power is directed to the bus to which the primary electrical equipment is connected.

[0083] In another case, if the second negative sequence current I2 leads the second negative sequence voltage U2, it is determined that the positive sequence power is directed to the primary electrical equipment; if the second negative sequence current I2 lags the second negative sequence voltage U2, it is determined that the positive sequence power is directed to the busbar to which the primary electrical equipment is connected.

[0084] The frequency directed to the primary electrical equipment is set as the second weight of the primary electrical equipment failure.

[0085] Generally, the primary electrical equipment with the second highest weight is the primary electrical equipment that fails in the power grid.

[0086] Step 105: locate the third weight of the primary electrical equipment failure in the power grid in the differential current direction according to the waveform recording file.

[0087] In this embodiment, the third weight of the failure of the primary electrical equipment in the power grid can be located in the dimension of the differential current direction of the recording file.

[0088] In a specific implementation, the starting point of the protection action event is determined in the recording file, and the data window from the starting point to multiple cycles (such as 2 cycles) after the starting point is shifted point by point to calculate the differential current value and the braking current boundary.

[0089] When the duration of the differential current value being greater than the braking current boundary exceeds a preset time threshold (e.g., 10ms), and the blocking conditions of the current transformer (CT) disconnection, current transformer (CT) saturation, and excitation inrush current are not met, the A set of protection, B set of protection, and the sensor for collecting the recording file corresponding to the protection action event are regarded as primary electrical equipment, and the differential current judgment is performed on the primary electrical equipment;

[0090] Each time the differential current determination is satisfied, the third weight of the primary electrical device is increased by 1.

[0091] Generally, the primary electrical equipment with the third highest weight is the primary electrical equipment that fails in the power grid.

[0092] Step 106: locate a faulty primary electrical device in the power grid according to the first weight, the second weight, and the third weight.

[0093] In this embodiment, for the same primary electrical equipment, its first weight, second weight and third weight may be comprehensively considered, so as to eventually locate the primary electrical equipment having a fault in the power grid.

[0094] In a specific implementation, if the primary electrical equipment with the highest first weight, the primary electrical equipment with the highest second weight and the primary electrical equipment with the highest third weight are the same, then the primary electrical equipment is determined to be the primary electrical equipment that has failed in the power grid.

[0095] If the primary electrical equipment with the highest first weight, the primary electrical equipment with the highest second weight, and the primary electrical equipment with the highest third weight are different, then for the same primary electrical equipment, the first weight, the second weight, and the third weight are added together to obtain a fourth weight, and it is verified whether the primary electrical equipment that fails in the power grid is the primary equipment with the highest fourth weight.

[0096] Furthermore, manual verification may be relied upon or other data may be used for verification, and this embodiment does not impose any limitation on this.

[0097] In this embodiment, when monitoring the power grid to initiate a protection action event, collect the recording files collected by the power grid on the primary electrical equipment that triggers the protection action event; determine the occurrence of a fault in the power grid based on the recording files; locate the first weight of a fault in a secondary electrical equipment in the power grid based on the protection action event; locate the second weight of a fault in a primary electrical equipment in the power grid in the power direction based on the recording files; locate the third weight of a fault in a primary electrical equipment in the power grid in the differential current direction based on the recording files; locate the primary electrical equipment that has failed in the power grid based on the first weight, the second weight, and the third weight. This embodiment comprehensively locates the primary electrical equipment that has failed in the power grid from the dimensions of protection action events, power, differential current, etc., which can effectively improve the judgment efficiency and accuracy of power grid faults, reduce the time of accidental power outages, reduce the losses caused by power outages, and improve the safe operation level of the power grid.

[0098] Embodiment 2

[0099] See also Figure 2 , shows a schematic diagram of the structure of a power grid fault equipment locating device provided by the second embodiment of the present invention. Figure 2 As shown, the device comprises:

[0100] The protection data collection module 201 is used to collect the recording files of the primary electrical equipment that triggers the protection action event collected by the power grid when monitoring the power grid starting the protection action event;

[0101] A fault determination module 202, configured to determine a fault of the power grid according to the recording file;

[0102] A first weight positioning module 203, configured to position a first weight of a fault of an electrical secondary device in the power grid according to the protection action event;

[0103] A second weight positioning module 204, used for positioning a second weight of a fault of a primary electrical device in the power grid in a power direction according to the recording file;

[0104] A third weight positioning module 205, used for positioning the third weight of the primary electrical equipment failure in the power grid in the differential current direction according to the recording file;

[0105] The fault locating module 206 is configured to locate a faulty primary electrical device in the power grid according to the first weight, the second weight, and the third weight.

[0106] In one embodiment of the present invention, the fault determination module 202 includes:

[0107] A starting point determination module, used for determining the starting point of the protection action event in the recording file;

[0108] A first voltage data reading module is used to read, under the voltage channel of the recording file, a first voltage effective value of the cycle data before the starting point, a second voltage effective value of the cycle data after the starting point, a first zero-sequence voltage of the cycle data after the starting point, and a first negative-sequence voltage of the cycle data after the starting point;

[0109] A first current data reading module is used to read, under the current channel of the recording file, a first current effective value of the cycle data before the starting point, a second current effective value of the cycle data after the starting point, a first zero-sequence current of the cycle data after the starting point, and a first negative-sequence current of the cycle data after the starting point;

[0110] a voltage mutation amount calculation module, configured to obtain a voltage mutation amount of the voltage channel by subtracting the second voltage effective value from the first voltage effective value;

[0111] A voltage mutation threshold generating module, used for generating a voltage mutation threshold according to the first zero-sequence voltage and the first negative-sequence voltage;

[0112] a current mutation amount calculation module, configured to obtain a current mutation amount of the current channel by subtracting the second current effective value from the first current effective value;

[0113] A current mutation threshold generating module, used to generate a current mutation threshold according to the first zero-sequence current and the first negative-sequence current;

[0114] A harmonic content reading module, used for reading the common content of the second harmonic and the third harmonic in the differential current channel of the recording file;

[0115] The multi-condition determination module is used to determine that the power grid has a fault when the voltage mutation amount is greater than the voltage mutation threshold, the current mutation amount is greater than the current mutation threshold, and the content is less than a preset excitation inrush current threshold.

[0116] In one embodiment of the present invention, the voltage mutation threshold generation module is further used for:

[0117] The maximum value between the first zero-sequence voltage and the first negative-sequence voltage is taken as the unbalanced voltage;

[0118] Query the rated voltage set for the voltage channel;

[0119] The voltage mutation threshold is obtained by adding the product of the unbalanced voltage and the preset voltage amplification factor to the product of the rated voltage and the preset voltage reduction factor;

[0120] The current mutation threshold generation module is also used for:

[0121] The maximum value between the first zero-sequence current and the first negative-sequence current is taken as the unbalanced current;

[0122] Querying the rated current set for the current channel;

[0123] The product of the unbalanced current and the preset current amplification factor is added to the product of the rated current and the preset current reduction factor to obtain a current mutation threshold.

[0124] In one embodiment of the present invention, the first weight positioning module 203 is further used for:

[0125] Adding a time window starting from the first of said protection action events;

[0126] Counting the primary electrical equipment in the power grid mapped by each of the protection action events within the time window as the protection scope of the protection action event;

[0127] The frequency of occurrence of the primary electrical equipment in the protection range is set as the first weight of the failure.

[0128] In one embodiment of the present invention, the second weight positioning module 204 includes:

[0129] A calculation point determination module, used to determine the starting point of the protection action event in the recording file, and determine the calculation point within a cycle after the first starting point;

[0130] A second voltage data reading module is used to read the positive sequence voltage, the second zero sequence voltage and the second negative sequence voltage of the cycle data before the calculation point under the voltage channel of the recording file;

[0131] A second voltage data current module is used to read the positive sequence current, the second zero sequence current and the second negative sequence current of the cycle data before the calculation point under the current channel of the recording file;

[0132] a power direction determination module, configured to identify a primary electrical device to which positive-sequence power is directed based on a relationship between the positive-sequence voltage and the positive-sequence current, a relationship between the second zero-sequence voltage and the second zero-sequence current, and a relationship between the second negative-sequence voltage and the second negative-sequence current;

[0133] The frequency setting module is used to set the frequency directed to the primary electrical equipment to the second weight of the primary electrical equipment having a fault.

[0134] In one embodiment of the present invention, the power direction determination module is further used for:

[0135] If the positive sequence current leads the positive sequence voltage, it is determined that the positive sequence power points to the busbar to which the primary electrical equipment is connected;

[0136] If the positive-sequence current lags behind the positive-sequence voltage, it is determined that the positive-sequence power is directed to the primary electrical equipment;

[0137] If the second zero-sequence current leads the second zero-sequence voltage, it is determined that the positive-sequence power is directed to the primary electrical equipment;

[0138] If the second zero-sequence current lags behind the second zero-sequence voltage, it is determined that the positive-sequence power points to the busbar to which the primary electrical equipment is connected;

[0139] If the second negative-sequence current leads the second negative-sequence voltage, it is determined that the positive-sequence power is directed to the primary electrical equipment;

[0140] If the second negative-sequence current lags behind the second negative-sequence voltage, it is determined that the positive-sequence power points to the busbar to which the primary electrical equipment is connected.

[0141] In one embodiment of the present invention, the third weight positioning module 205 is further used for:

[0142] Determine the starting point of the protection action event in the recording file, and translate point by point in a data window from the starting point to a plurality of cycles after the starting point to calculate the differential current value and the braking current boundary;

[0143] When the duration of the differential current value being greater than the braking current boundary exceeds a preset time threshold, and the blocking conditions of current transformer disconnection, current transformer saturation, and excitation inrush current are not met, the A set of protection, the B set of protection corresponding to the protection action event, and the sensor for collecting the recording file are used as primary electrical equipment, and differential current determination is performed on the primary electrical equipment;

[0144] Each time the differential current determination is satisfied, the third weight of the primary electrical device is increased by 1.

[0145] In one embodiment of the present invention, the fault location module 206 is further configured to:

[0146] If the first primary electrical device with the highest weight, the second primary electrical device with the highest weight and the third primary electrical device with the highest weight are the same, determining that the primary electrical device is the primary electrical device that has a fault in the power grid;

[0147] If the primary electrical equipment with the first highest weight, the primary electrical equipment with the second highest weight, and the primary electrical equipment with the third highest weight are different, then for the same primary electrical equipment, the first weight, the second weight, and the third weight are added together to obtain a fourth weight;

[0148] Verify whether the primary electrical equipment that fails in the power grid is the primary equipment with the fourth highest weight.

[0149] The power grid fault equipment locating device provided in the embodiment of the present invention can execute the power grid fault equipment locating method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the power grid fault equipment locating method.

[0150] Embodiment 3

[0151] See also Figure 3 , showing a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, blade servers, mainframe computers, and other suitable computers. The electronic device may 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.

[0152] like Figure 3 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0153] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0154] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special 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 11 executes the various methods and processes described above, such as a method for locating a power grid fault device.

[0155] In some embodiments, the power grid fault device locating method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the power grid fault device locating method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the power grid fault device locating method in any other appropriate manner (e.g., by means of firmware).

[0156] 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), load 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.

[0157] 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.

[0158] 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.

[0159] 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).

[0160] 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.

[0161] 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.

[0162] Embodiment 4

[0163] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the method for locating a faulty device in a power grid as provided in any embodiment of the present invention is implemented.

[0164] In the process of implementation, the computer program product can be written in one or more programming languages ​​or a combination thereof to perform the computer program code of the present invention, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, using an Internet service provider to connect through the Internet).

[0165] 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.

[0166] 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 method for locating faulty equipment in a power grid, characterized in that: include: When monitoring the power grid to initiate a protection action event, collect the recording file of the power grid collecting the primary electrical equipment that triggers the protection action event; Determining the occurrence of a fault in the power grid according to the recording file; Locating a first weight of a fault of an electrical secondary device in the power grid according to the protection action event; Locating a second weight of a fault in a primary electrical device in the power grid in a power direction according to the wave recording file; Locating a third weight of a fault in a primary electrical device in the power grid in a differential current direction according to the wave recording file; A primary electrical device having a fault in the power grid is located according to the first weight, the second weight, and the third weight.

2. The method according to claim 1, characterized in that The determining, based on the recorded wave file, that a fault has occurred in the power grid comprises: Determining the starting point of the protection action event in the recording file; Reading, under the voltage channel of the recording file, a first voltage effective value of the cycle data before the starting point, a second voltage effective value of the cycle data after the starting point, a first zero-sequence voltage of the cycle data after the starting point, and a first negative-sequence voltage of the cycle data after the starting point; Reading, under the current channel of the recording file, a first current effective value of the cycle data before the start point, a second current effective value of the cycle data after the start point, a first zero-sequence current of the cycle data after the start point, and a first negative-sequence current of the cycle data after the start point; Subtracting the second voltage effective value from the first voltage effective value to obtain a voltage mutation amount of the voltage channel; generating a voltage mutation threshold according to the first zero-sequence voltage and the first negative-sequence voltage; Subtracting the second current effective value from the first current effective value to obtain a current mutation amount of the current channel; generating a current mutation threshold according to the first zero-sequence current and the first negative-sequence current; Reading the common content of the second harmonic and the third harmonic in the differential current channel of the recording file; When the voltage mutation amount is greater than the voltage mutation threshold, the current mutation amount is greater than the current mutation threshold, and the content is less than a preset excitation inrush current threshold, it is determined that a fault occurs in the power grid.

3. The method according to claim 2, characterized in that The generating a voltage mutation threshold according to the first zero-sequence voltage and the first negative-sequence voltage includes: The maximum value between the first zero-sequence voltage and the first negative-sequence voltage is taken as the unbalanced voltage; Query the rated voltage set for the voltage channel; The voltage mutation threshold is obtained by adding the product of the unbalanced voltage and the preset voltage amplification factor to the product of the rated voltage and the preset voltage reduction factor; The generating a current mutation threshold according to the first zero-sequence current and the first negative-sequence current includes: taking the maximum of the first zero-sequence current and the first negative-sequence current as the unbalanced current; Querying the rated current set for the current channel; The product of the unbalanced current and the preset current amplification factor is added to the product of the rated current and the preset current reduction factor to obtain a current mutation threshold.

4. The method according to claim 1, characterized in that: The first weight of locating a fault of an electrical secondary device in the power grid according to the protection action event comprises: Adding a time window starting from the first of said protection action events; Counting the primary electrical equipment in the power grid mapped by each of the protection action events within the time window as the protection scope of the protection action event; The frequency of occurrence of the primary electrical equipment in the protection range is set as the first weight of the failure.

5. The method according to claim 1, characterized in that The second weight of locating a fault of a primary electrical device in the power grid in the power direction according to the recording file comprises: Determine the starting point of the protection action event in the recording file, and determine the calculation point within a cycle after the first starting point; Read the positive sequence voltage, the second zero sequence voltage and the second negative sequence voltage of the wave data of one cycle before the calculation point under the voltage channel of the wave recording file; Read the positive sequence current, the second zero sequence current and the second negative sequence current of the wave data of one cycle before the calculation point under the current channel of the wave recording file; Identify the primary electrical equipment to which the positive-sequence power is directed according to the relationship between the positive-sequence voltage and the positive-sequence current, the relationship between the second zero-sequence voltage and the second zero-sequence current, and the relationship between the second negative-sequence voltage and the second negative-sequence current; The frequency directed to the primary electrical device is set as a second weight of a failure of the primary electrical device.

6. The method according to claim 5, characterized in that The method for identifying a primary electrical device to which positive-sequence power is directed based on the relationship between the positive-sequence voltage and the positive-sequence current, the relationship between the second zero-sequence voltage and the second zero-sequence current, and the relationship between the second negative-sequence voltage and the second negative-sequence current includes: If the positive sequence current leads the positive sequence voltage, it is determined that the positive sequence power points to the busbar to which the primary electrical equipment is connected; If the positive-sequence current lags behind the positive-sequence voltage, it is determined that the positive-sequence power is directed to the primary electrical equipment; If the second zero-sequence current leads the second zero-sequence voltage, it is determined that the positive-sequence power is directed to the primary electrical equipment; If the second zero-sequence current lags behind the second zero-sequence voltage, it is determined that the positive-sequence power points to the busbar to which the primary electrical equipment is connected; If the second negative-sequence current leads the second negative-sequence voltage, it is determined that the positive-sequence power is directed to the primary electrical equipment; If the second negative-sequence current lags behind the second negative-sequence voltage, it is determined that the positive-sequence power points to the busbar to which the primary electrical equipment is connected.

7. The method according to claim 1, characterized in that The third weight of locating a fault of a primary electrical device in the power grid in the differential current direction according to the waveform recording file includes: Determine the starting point of the protection action event in the recording file, and translate point by point in a data window from the starting point to a plurality of cycles after the starting point to calculate the differential current value and the braking current boundary; When the duration of the differential current value being greater than the braking current boundary exceeds a preset time threshold, and the blocking conditions of current transformer disconnection, current transformer saturation, and excitation inrush current are not met, the A set of protection, the B set of protection corresponding to the protection action event, and the sensor for collecting the recording file are used as primary electrical equipment, and differential current determination is performed on the primary electrical equipment; Each time the differential current determination is satisfied, the third weight of the primary electrical device is increased by 1.

8. The method according to any one of claims 1 to 7, characterized in that The method of locating a primary electrical device having a fault in the power grid according to the first weight, the second weight, and the third weight includes: If the first primary electrical device with the highest weight, the second primary electrical device with the highest weight and the third primary electrical device with the highest weight are the same, determining that the primary electrical device is the primary electrical device that has a fault in the power grid; If the primary electrical equipment with the first highest weight, the primary electrical equipment with the second highest weight, and the primary electrical equipment with the third highest weight are different, then for the same primary electrical equipment, the first weight, the second weight, and the third weight are added together to obtain a fourth weight; Verify whether the primary electrical equipment that fails in the power grid is the primary equipment with the fourth highest weight.

9. 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 execute the power grid fault device locating method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for locating a faulty device in a power grid according to any one of claims 1 to 8 is implemented.

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