A power grid fault device positioning method, device and storage medium

Abstract

The application discloses a power grid fault equipment positioning method and device and a storage medium, and the method comprises the following steps: when a protection action event of a power grid is listened to, collecting a recording wave file of a primary electrical equipment collected by the power grid for triggering the protection action event; determining a fault of the power grid according to the recording wave file; positioning a first weight of a secondary electrical equipment in the power grid according to the protection action event; positioning a second weight of the primary electrical equipment in the power grid in a power direction according to the recording wave file; positioning a third weight of the primary electrical equipment in the power grid in a differential current direction according to the recording wave file; and positioning the primary electrical equipment in the power grid according to the first weight, the second weight and the third weight. The primary electrical equipment in the power grid is positioned from the dimensions of the protection action event, power and differential current, so that the judgment efficiency and accuracy of the power grid fault can be effectively improved, the outage time of an accident can be reduced, and the safe operation level of the power grid can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power grid, and particularly relates to a power grid fault device positioning method, device and storage medium. BACKGROUND

[0002] In order to meet the increasing demand for electricity, the scale of power grid is expanding, and the probability of power grid failure is also rising. After the failure occurs, the fault device needs to be quickly located so as to restore power supply as soon as possible.

[0003] At present, the power grid fault analysis and positioning process is mostly realized by manual operation, and part of the work can be assisted by recording wave analysis tools for auxiliary analysis. Overall, the efficiency is low, the technical level of personnel is high, and analysis errors are prone to occur. SUMMARY

[0004] Therefore, the present application provides a power grid fault device positioning method, device and storage medium to improve the efficiency of locating faults in the power grid.

[0005] The first aspect of the present application provides a power grid fault device positioning method, comprising:

[0006] When a protection action event of the power grid is monitored, a recording wave file collected by a primary electrical device of the power grid for triggering the protection action event is collected;

[0007] A fault of the power grid is determined according to the recording wave file;

[0008] A first weight of a secondary electrical device in the power grid is positioned according to the protection action event;

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

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

[0011] The primary electrical device in the power grid is positioned according to the first weight, the second weight and the third weight.

[0012] The second aspect of the present application provides a power grid fault device positioning device, comprising:

[0013] A protection data collection module is configured to collect a recording wave file collected by a primary electrical device of the power grid for triggering a protection action event when a protection action event of the power grid is monitored;

[0014] A fault determination module is configured to determine a fault of the power grid according to the recording wave file;

[0015] a first weight positioning module configured to position a first weight of a fault of a secondary electrical device in the power grid according to the protection action event;

[0016] a second weight positioning module configured to position a second weight of a fault of a primary electrical device in the power grid according to the power direction of the recorded wave file;

[0017] a third weight positioning module configured to position a third weight of a fault of a primary electrical device in the power grid according to the current direction of the recorded wave file;

[0018] a fault positioning module configured to position a primary electrical device with 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 application provides an electronic device, which comprises:

[0020] at least one processor; and

[0021] a memory connected to the at least one processor in communication; 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 to enable the at least one processor to execute the power grid fault device positioning method according to the first aspect.

[0023] A fourth aspect of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the power grid fault device positioning method according to the first aspect.

[0024] A fifth aspect of the present application provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to implement the power grid fault device positioning method according to the first aspect.

[0025] In the embodiment, when a protection action event of the power grid is monitored, a recording wave file of a primary electrical device triggering the protection action event is collected; a fault of the power grid is determined according to the recording wave file; a first weight of a secondary electrical device in the power grid is located according to the protection action event; a second weight of the primary electrical device in the power grid is located in a power direction according to the recording wave file; a third weight of the primary electrical device in the power grid is located in a differential current direction according to the recording wave file; and the primary electrical device in the power grid is located according to the first weight, the second weight and the third weight. The primary electrical device in the power grid is located from the protection action event, the power and the differential current, which can effectively improve the judgment efficiency and accuracy of the power grid fault, reduce the outage time and the loss caused by the outage, and improve the safe operation level of the power grid.

[0026] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description 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 creative labor.

[0028] Figure 1 is a flow chart of a power grid fault device positioning method provided by the first embodiment of the present application.

[0029] Figure 2 is a structural schematic diagram of a power grid fault device positioning device provided by the second embodiment of the present application.

[0030] Figure 3 is a structural schematic diagram of an electronic device provided by the third embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to 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, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0032] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and above-described accompanying drawings are used to distinguish similar objects, and do not necessarily indicate 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 encompass orders other than those 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 device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0033] Embodiment one

[0034] Referring to Figure 1 , a flow chart of a power grid fault equipment positioning method provided by the embodiment one of the present application is shown, the method can be executed by a power grid fault equipment positioning device, the power grid fault equipment positioning device can be realized in the form of hardware and / or software, and the power grid fault equipment positioning device can be configured in an electronic device. As shown in Figure 1 , the method comprises:

[0035] Step 101, when a protection action event of the power grid is listened to, collecting a recording wave file of a primary electrical equipment collected by the power grid for triggering the protection action event.

[0036] In the embodiment, whether the protection action event of the power grid is started can be continuously listened to, if the protection action event of the power grid is started, the sensor can be called to collect the recording wave file of each primary electrical equipment collected by the power grid for triggering the protection action event for a preset time length (such as 30 seconds).

[0037] In the power grid, the primary electrical equipment refers to the high-voltage electrical equipment of the production process directly used for producing, transmitting and distributing electric energy, including a generator, a transformer, a circuit breaker, a disconnector, an automatic switch, a contactor, a knife switch, a bus, a power transmission line, a power cable, a reactor, a motor and the like.

[0038] Step 102, determining a fault of the power grid according to the recording wave file.

[0039] In actual application, the data in the recording wave file can be analyzed, and the fault of the power grid can be determined in a macroscopic aspect.

[0040] In an embodiment of the present application, the step 102 can comprise the following steps:

[0041] Step 1021, determining a starting point of the protection action event in the recording wave file.

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

[0043] In step 1022, the first voltage effective value of the data of one cycle before the starting point, the second voltage effective value of the data of one cycle after the starting point, the first zero sequence voltage of the data of one cycle after the starting point and the first negative sequence voltage of the data of one cycle after the starting point are read under the voltage channel of the recording file.

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

[0045] In step 1023, the first current effective value of the data of one cycle before the starting point, the second current effective value of the data of one cycle after the starting point, the first zero sequence current of the data of one cycle after the starting point and the first negative sequence current of the data of one cycle after the starting point are read under the current channel of the recording file.

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

[0047] In step 1024, the first voltage effective value is subtracted from the second voltage effective value to obtain the voltage mutation variable of the voltage channel.

[0048] In the embodiment, the first voltage effective value Uk is subtracted from the second voltage effective value Un to obtain the voltage mutation variable ΔU of the voltage channel, that is, ΔU=Uk-Un.

[0049] In step 1025, the voltage mutation threshold is generated according to the first zero sequence voltage and the first negative sequence voltage.

[0050] In the embodiment, the voltage mutation threshold can 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 maximum of the first zero sequence voltage U0 and the first negative sequence voltage U2 is taken as the unbalanced voltage ΔUT, 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 as the unbalanced voltage ΔUT, 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 as the unbalanced voltage ΔUT.

[0052] Inquiring the rated voltage UN set to the voltage channel, wherein the rated voltage UN is an empirical value.

[0053] Adding the product between the unbalanced voltage and the preset voltage amplification coefficient (the voltage amplification coefficient is greater than 1) and the product between the rated voltage and the preset voltage reduction coefficient (the voltage reduction coefficient is less than 1), the voltage mutation threshold is obtained.

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

[0055] Step 1026, subtracting the second current effective value from the first current effective value, the current mutation of the current channel is obtained.

[0056] In the embodiment, the first current effective value Ik can be subtracted from the second current effective value In, and the current mutation In of the current channel is obtained, that is, △I=Ik-In.

[0057] Step 1027, generating the current mutation threshold according to the first zero sequence current I0 and the first negative sequence current I2.

[0058] In the embodiment, the voltage mutation threshold can 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 maximum of 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 as 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 as the unbalanced current △IT.

[0060] Inquiring the rated current IN set to the current channel, wherein the rated current IN is an empirical value.

[0061] Adding the product between the unbalanced current and the preset current amplification coefficient (the current amplification coefficient is greater than 1) and the product between the rated current and the preset current reduction coefficient (the current reduction coefficient is less than 1), the current mutation threshold is obtained.

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

[0063] Step 1028, reading the content common to the second harmonic and the third harmonic in the differential current channel of the recording wave file.

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

[0065] When the content is greater than or equal to the preset inrush current threshold, it is determined that the power grid has inrush current; when the content is less than the preset inrush current threshold, it is determined that the power grid does not have inrush current.

[0066] Step 1029, when the voltage mutation is greater than the voltage mutation threshold, the current mutation is greater than the current mutation threshold, and the content is less than the preset inrush current threshold, it is determined that the power grid has a fault.

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

[0068] Step 103, positioning the first weight of the fault of the electrical secondary device in the power grid according to the protection action event.

[0069] In the embodiment, the first weight of the fault of the electrical secondary device in the power grid can be positioned in the dimension of the protection action event.

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

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

[0072] According to the primary electrical device in the power grid mapped by each protection action event in the mapping relationship time window, the protection range of the protection action event is determined.

[0073] The frequency of the primary electrical device in the protection range is set as the first weight of the fault.

[0074] Generally, the primary electrical device with the highest first weight is the primary electrical device with the fault in the power grid.

[0075] Step 104, positioning the second weight of the fault of the primary electrical device in the power grid according to the recording wave file in the power direction.

[0076] In the embodiment, the second weight of the fault of the primary electrical device in the power grid can be positioned in the dimension of the power direction of the recording wave 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 one cycle (e.g., 0.75 cycles) after the first starting point.

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

[0079] In another aspect, the positive sequence current I1, the second zero sequence current I0, and the second negative sequence current I2 of the data of the previous cycle of the calculation point are read under the current channel of the recording file.

[0080] The primary electrical equipment to which the positive sequence power is directed is identified according to 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 bus 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 yet 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 bus to which the primary electrical equipment is connected.

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

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

[0086] Step 105, the third weight of the fault of the primary electrical equipment in the power grid is located according to the recording file in the differential current direction.

[0087] In the embodiment, the third weight of the fault 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 (e.g., 2 cycles) after the starting point is translated point by point to calculate the differential current value and the braking current boundary.

[0089] When the duration that the differential current value is greater than the braking current boundary exceeds a preset time threshold (such as 10 ms) and the blocking conditions of the current transformer (CT) disconnection, the current transformer (CT) saturation, and the field inrush current are not met, the A set of protections, the B set of protections, and the sensors of the acquisition recording wave file corresponding to the protection action event are taken as the primary electrical equipment, and the differential current determination is performed on the primary electrical equipment.

[0090] When the differential current determination is met each time, the third weight of the primary electrical equipment is increased by 1.

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

[0092] Step 106: Locating the primary electrical equipment that has a fault in the power grid according to the first weight, the second weight, and the third weight.

[0093] In the embodiment, the first weight, the second weight, and the third weight of the same primary electrical equipment are comprehensively considered, so as to finally locate the primary electrical equipment that has a fault in the power grid.

[0094] In the 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, it is determined that the primary electrical equipment is the primary electrical equipment that has a fault 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, the first weight, the second weight, and the third weight of the same primary electrical equipment are added to obtain a fourth weight, and it is verified whether the primary electrical equipment that has a fault in the power grid is the primary electrical equipment with the highest fourth weight.

[0096] Further, the verification can be performed by relying on manual verification or using other data, and the embodiment does not limit this.

[0097] In the embodiment, when a protection action event of a power grid is monitored, a recording wave file of a primary electrical equipment triggering the protection action event is collected; a fault of the power grid is determined according to the recording wave file; a first weight of a secondary electrical equipment in the power grid is located according to the protection action event; a second weight of the primary electrical equipment in the power grid is located in a power direction according to the recording wave file; a third weight of the primary electrical equipment in the power grid is located in a differential current direction according to the recording wave file; and the primary electrical equipment in the power grid is located according to the first weight, the second weight and the third weight. The primary electrical equipment in the power grid is located from the protection action event, the power and the differential current, which can effectively improve the judgment efficiency and accuracy of the power grid fault, reduce the outage time and the loss caused by the outage, and improve the safe operation level of the power grid.

[0098] Embodiment two

[0099] Referring to Figure 2 , a structure schematic diagram of a power grid fault equipment locating device provided by an embodiment two of the present application is shown. As Figure 2 indicated, the device comprises:

[0100] a protection data collection module 201, configured to collect a recording wave file of a primary electrical equipment triggering a protection action event of a power grid when the protection action event of the power grid is monitored;

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

[0102] a first weight locating module 203, configured to locate a first weight of a secondary electrical equipment in the power grid according to the protection action event;

[0103] a second weight locating module 204, configured to locate a second weight of the primary electrical equipment in the power grid in a power direction according to the recording wave file;

[0104] a third weight locating module 205, configured to locate a third weight of the primary electrical equipment in the power grid in a differential current direction according to the recording wave file;

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

[0106] In an embodiment of the present application, the fault determination module 202 comprises:

[0107] a starting point determination module, configured to determine a starting point of the protection action event in the recording wave file;

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

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

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

[0111] a voltage mutation threshold generation module, configured to generate 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 subtract the second current effective value from the first current effective value to obtain a current mutation amount of the current channel;

[0113] a current mutation threshold generation module, configured 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, configured to read a content of a second harmonic and a third harmonic in a differential current channel of the recording file;

[0115] a multi-condition determination module, configured 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 threshold.

[0116] In an embodiment of the present application, the voltage mutation threshold generation module is further configured to:

[0117] take a maximum value of the first zero sequence voltage and the first negative sequence voltage as an unbalanced voltage;

[0118] query a rated voltage set for the voltage channel;

[0119] add a product between the unbalanced voltage and a preset voltage amplification coefficient to a product between the rated voltage and a preset voltage reduction coefficient to obtain the voltage mutation threshold;

[0120] The current mutation threshold generation module is further configured to:

[0121] Taking the maximum of the first zero sequence current and the first negative sequence current as an unbalanced current;

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

[0123] Adding a product between the unbalanced current and a preset current amplification coefficient to a product between the rated current and a preset current reduction coefficient to obtain a current mutation threshold.

[0124] In an embodiment of the present application, the first weight positioning module 203 is further configured to:

[0125] Adding a time window from a first protection action event;

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

[0127] Setting a frequency of the primary electrical equipment in the protection range as a first weight of a fault.

[0128] In an embodiment of the present application, the second weight positioning module 204 comprises:

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

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

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

[0132] A power direction determination module configured to identify a primary electrical equipment of a positive sequence power direction according to 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] A frequency setting module configured to set a frequency of the primary electrical equipment as a second weight of a fault of the primary electrical equipment.

[0134] In an embodiment of the present application, the power direction determination module is further configured to:

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

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

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

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

[0141] In an embodiment of the present application, the third weight positioning module 205 is further configured to:

[0142] determine the starting point of the protection action event in the recording file, and point by point translation in the 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 that the differential current value is 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 are not met, the A set of protections, the B set of protections corresponding to the protection action event and the sensor collecting the recording file are taken as the primary electrical equipment, and the differential current determination is performed on the primary electrical equipment;

[0144] the third weight of the primary electrical equipment is increased by 1 each time the differential current determination is met.

[0145] In an embodiment of the present application, the fault positioning module 206 is further configured to:

[0146] 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, it is determined that the primary electrical equipment is the primary electrical equipment in which the fault occurs in the power grid;

[0147] 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, the first weight, the second weight and the third weight are added for the same primary electrical equipment to obtain a fourth weight;

[0148] checking whether the faulty primary electrical device in the power grid is the primary device with the highest fourth weight.

[0149] The power grid fault device positioning apparatus provided by the embodiments of the present application can execute the power grid fault device positioning method provided by any of the embodiments of the present application, and has the corresponding function modules and beneficial effects of executing the power grid fault device positioning method.

[0150] Embodiment three

[0151] Referring to Figure 3 , a structure schematic diagram of an electronic device provided by an embodiment 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, 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 (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, 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.

[0152] As Figure 3 shown, the electronic device 10 includes at least one processor 11, and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11, wherein the memory stores a computer program that can be executed by the at least one processor. The processor 11 can execute 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 into 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 plurality 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 magnetic 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 telecommunications networks.

[0154] The processor 11 can be various general and / or special purpose processing components having 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 specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 performs various methods and processes described above, such as the power grid fault device location method.

[0155] In some embodiments, the power grid fault device location method can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded onto the RAM 13 and executed by the processor 11, one or more steps of the power grid fault device location method described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the power grid fault device location method by any other suitable means, such as by means of firmware.

[0156] Various implementations of the systems and techniques described above can be realized 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 programmable logic device (PLD), a computer hardware, firmware, software, and / or combinations thereof. These various implementations 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.

[0157] Computer programs used to implement the methods 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 to produce a machine, such that the computer program, when executed by the processor of the machine, implements the functions / acts specified in the flowcharts and / or block diagrams. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as a stand-alone software package, and partially on a machine or a remote machine or a server.

[0158] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer-readable storage medium can include, but is not limited to, an 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 a machine-readable storage medium will include one or more lines of a program of instructions in a transitory signal, a portable computer diskette, 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 disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0159] 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.

[0160] 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.

[0161] 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. Servers can be cloud servers, also known as cloud computing servers or cloud hosts, which are a host product in the cloud computing service system to solve the defects of large management difficulty and weak business scalability in traditional physical hosts and VPS services.

[0162] Embodiment four

[0163] The embodiment of the present application also provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to realize the power grid fault device positioning method provided by any embodiment of the present application.

[0164] The computer program code implementing the present application can be written in one or more programming languages or combinations of languages including object oriented languages such as Java, Smalltalk, C++ or conventional procedural programming languages such as "C" or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, 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 the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0165] 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 application. For example, the steps recited in the present application can be performed in parallel, in series, or in a different order, and the present application is not limited in this regard.

[0166] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of locating a power grid fault device, the method comprising: The method comprises the following steps: collecting a recording file of a power grid collected by an electrical device triggering a protection action event of the power grid when the protection action event of the power grid is monitored; determining a fault of the power grid according to the recording file; locating a first weight of a fault of a primary electrical device in the power grid according to the protection action event; locating a second weight of a fault of a primary electrical device in the power grid in a power direction according to the recording file; locating a third weight of a fault of a primary electrical device in the power grid in a differential current direction according to the recording file; if the primary electrical device with the highest first weight, the primary electrical device with the highest second weight and the primary electrical device with the highest third weight are the same, determining the primary electrical device as the primary electrical device with a fault in the power grid; if the primary electrical device with the highest first weight, the primary electrical device with the highest second weight and the primary electrical device with the highest third weight are different, adding the first weight, the second weight and the third weight to obtain a fourth weight for the same primary electrical device; verifying whether the primary electrical device with a fault in the power grid is the primary electrical device with the highest fourth weight.

2. The method of claim 1, wherein, The method of determining a fault of the power grid according to the recording file comprises the following steps: determining a starting point of the protection action event in the recording file; reading a first voltage effective value of one cycle data before the starting point, a second voltage effective value of one cycle data after the starting point, a first zero sequence voltage of one cycle data after the starting point and a first negative sequence voltage of one cycle data after the starting point in a voltage channel of the recording file; reading a first current effective value of one cycle data before the starting point, a second current effective value of one cycle data after the starting point, a first zero sequence current of one cycle data after the starting point and a first negative sequence current of one cycle data after the starting point in a current channel of the recording file; subtracting the second voltage effective value from the first voltage effective value to obtain a voltage mutation variable 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 variable of the current channel; generating a current mutation threshold according to the first zero sequence current and the first negative sequence current; reading a content of a second harmonic and a third harmonic in a differential current channel of the recording file; when the voltage mutation variable is greater than the voltage mutation threshold, the current mutation variable is greater than the current mutation threshold and the content is less than a preset excitation inrush threshold, determining that the power grid has a fault.

3. The method of claim 2, wherein, The method of generating a voltage mutation threshold according to the first zero sequence voltage and the first negative sequence voltage comprises the following steps: taking a maximum value of the first zero sequence voltage and the first negative sequence voltage as an unbalanced voltage; inquiring a rated voltage set for the voltage channel; multiplying the unbalanced voltage by a preset voltage amplification coefficient, adding a product of the rated voltage and a preset voltage reduction coefficient to obtain the voltage mutation threshold. The generating current jump threshold value according to the first zero sequence current and the first negative sequence current comprises: Taking the maximum of the first zero sequence current and the first negative sequence current as an unbalanced current; Inquiring a rated current set for the current channel; Adding a product between the unbalanced current and a preset current amplification coefficient to a product between the rated current and a preset current reduction coefficient to obtain the current jump threshold value.

4. The method of claim 1, wherein, The first weight of locating a fault of a primary electrical equipment in the power grid according to the protection action event comprises: Adding a time window from the first protection action event; Counting the primary electrical equipment mapped by each protection action event in the time window as a protection range of the protection action event; Setting a frequency of the primary electrical equipment in the protection range as the first weight of the fault.

5. The method of claim 1, wherein, The second weight of locating a fault of a primary electrical equipment in the power grid according to the power direction of the recording wave file comprises: Determining a starting point of the protection action event in the recording wave file and a calculation point in a cycle after the first starting point; Reading positive sequence voltage, second zero sequence voltage and second negative sequence voltage of a previous cycle data of the calculation point under a voltage channel of the recording wave file; Reading positive sequence current, second zero sequence current and second negative sequence current of the previous cycle data of the calculation point under a current channel of the recording wave file; Identifying a primary electrical equipment of positive sequence power direction according to 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; Setting a frequency of the primary electrical equipment as the second weight of the fault of the primary electrical equipment.

6. The method of claim 5, wherein, The identifying a primary electrical equipment of positive sequence power direction according to 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 comprises: If the positive sequence current leads the positive sequence voltage, determining that the positive sequence power direction is a bus connected with a primary electrical equipment; If the positive sequence current lags behind the positive sequence voltage, determining that the positive sequence power direction is the primary electrical equipment; If the second zero sequence current leads the second zero sequence voltage, determining that the positive sequence power direction is the primary electrical equipment; If the second zero sequence current lags behind the second zero sequence voltage, determining that the positive sequence power direction is a bus connected with the primary electrical equipment; If the second negative sequence current leads the second negative sequence voltage, determining that the positive sequence power direction is the primary electrical equipment; If the second negative sequence current lags behind the second negative sequence voltage, determining that the positive sequence power direction is a bus connected with the primary electrical equipment.

7. The method of claim 1, wherein, The third weight of locating a fault of a primary electrical equipment in the power grid according to the difference current direction of the recording wave file comprises: A starting point of the protection action event is determined in the recording file, and a data window from the starting point to a plurality of cycles after the starting point is point by point translated to calculate a differential current value and a braking current boundary; When the differential current value is greater than the braking current boundary for a duration exceeding a preset time threshold, and a current transformer disconnection, a current transformer saturation, and an excitation inrush locking condition are not met, an A set protection, a B set protection, and a sensor collecting the recording file corresponding to the protection action event are taken as a primary electrical equipment, and the primary electrical equipment is subjected to differential current determination; A third weight of the primary electrical equipment is increased by 1 each time the differential current determination is met.

8. An electronic device, comprising: The electronic device comprises: at least one processor; and a memory connected with the at least one processor in communication; 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 to enable the at least one processor to execute the power grid fault equipment positioning method according to any one of claims 1-7.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the power grid fault equipment positioning method according to any one of claims 1-7.

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