Power distribution network communication fault type identification method and device, electronic equipment and storage medium

Abstract

The invention discloses a power distribution network communication fault type identification method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining a voltage mode time-frequency matrix before and after a power distribution network communication fault, and extracting a voltage fundamental wave amplitude, a voltage main harmonic amplitude and the number of times of the voltage main harmonic amplitude before and after the communication fault; acquiring a current mode time-frequency matrix before and after a communication fault of the power distribution network, and extracting a current direct current amplitude, a current main harmonic amplitude, a current main harmonic amplitude frequency and a current total frequency band amplitude before and after the communication fault; and establishing a criterion based on the parameters, and determining whether the communication fault type of the power distribution network is a lightning flashover communication fault or an insulator pollution flashover communication fault. By implementing the method, the lightning flashover communication fault and the insulator pollution flashover communication fault in the power distribution network can be effectively identified, so that the operation reliability of the power distribution network is remarkably improved, and safe and stable operation of a power system is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of fault identification technology, and in particular to a method, device, electronic equipment and storage medium for identifying a type of communication fault in a distribution network. Background Art

[0002] In the power system, communication failures in the distribution network are often caused by lightning flashover or insulator flashover. According to statistics, about 40% to 70% of communication failures are closely related to lightning activities. When lightning strikes the line, the huge current and voltage generated will cause serious interference to the communication system and even paralyze it. In comparison, the frequency of insulator flashover events is low, but they have the characteristics of frequent recurrence in a short period of time, resulting in a significant continuous impact on the communication system, and the economic losses caused are often up to ten times that of lightning accidents.

[0003] When dealing with distribution network communication failures, existing technologies mainly focus on determining whether a failure has occurred, but lack in-depth research on different types of failures. This limitation makes it impossible to take corresponding maintenance measures according to the specific type of failure after the failure occurs, resulting in insufficient accuracy of maintenance operations and inability to fully guarantee the safe and stable operation of the distribution network. Summary of the invention

[0004] The embodiment of the present invention provides a method, device, electronic device and storage medium for identifying the type of communication fault in a distribution network. By implementing the present invention, lightning flashover communication faults and insulator pollution flashover communication faults can be identified, thereby ensuring the safety and stability of the distribution network.

[0005] An embodiment of the present invention provides a method for identifying a type of communication fault in a distribution network, comprising:

[0006] Obtain the current mode time-frequency matrix and voltage mode time-frequency matrix before and after the distribution network communication fault occurs;

[0007] According to the current mode time-frequency matrix before and after the communication fault occurs, the DC amplitude of the current, the amplitude of the main harmonics of the current, the order of the main harmonics of the current and the amplitude of the total frequency band of the current before and after the communication fault occurs are extracted; among which, the main harmonics of the current include the third harmonic of the current and the fifth harmonic of the current;

[0008] According to the voltage modulus time-frequency matrix before and after the communication fault occurs, the voltage fundamental amplitude, voltage main harmonic amplitude and voltage main harmonic order before and after the communication fault occurs are extracted; among which, the voltage main harmonics include voltage third harmonic and voltage fifth harmonic;

[0009] According to the voltage fundamental wave amplitude before and after the communication fault occurs, the voltage fundamental wave amplitude drop rate is calculated;

[0010] When the voltage fundamental amplitude decrease rate is greater than the preset decrease rate, the current main harmonic order after the communication fault occurs is greater than the preset first order, the voltage main harmonic order after the communication fault occurs is greater than the preset second order, the current main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, and the voltage main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, it is determined that the distribution network communication fault type is a lightning flashover communication fault;

[0011] The DC content difference is calculated based on the DC amplitude of the current before and after the communication fault occurs; the third harmonic content difference is calculated based on the third harmonic amplitude of the current before and after the communication fault occurs; the fifth harmonic content difference is calculated based on the fifth harmonic amplitude of the current before and after the communication fault occurs;

[0012] When the DC content difference is greater than a preset first difference, the third harmonic content difference is greater than a preset second difference, and the fifth harmonic content difference is greater than a preset third difference, it is determined that the distribution network communication fault type is an insulator flashover communication fault.

[0013] Furthermore, the step of obtaining the current mode time-frequency matrix and the voltage mode time-frequency matrix before and after the distribution network communication fault occurs includes:

[0014] Obtaining a first current and a first voltage before a distribution network communication fault occurs;

[0015] Acquire a second current and a second voltage after a distribution network communication fault occurs;

[0016] Performing discrete S transformation on the first current and the first voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix before the communication fault occurs;

[0017] Discrete S transform is performed on the second current and the second voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix after the communication fault occurs.

[0018] Further, the obtaining of the first current and the first voltage before the distribution network communication fault occurs includes:

[0019] Obtaining the three-phase current within a preset period of time before the communication failure occurs;

[0020] Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents;

[0021] Perform load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current;

[0022] Calculate the effective value of the three-phase current in each segment and generate the effective value of the three-phase current in each segment;

[0023] Select the maximum value of the effective value of the three-phase current in each segment as the first current before the distribution network communication fault occurs;

[0024] The voltage corresponding to the first current is used as the first voltage.

[0025] Further, the obtaining of the second current and the second voltage after the distribution network communication failure occurs includes:

[0026] Obtaining three-phase current within a preset period of time after a communication failure occurs;

[0027] Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents;

[0028] Perform load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current;

[0029] Calculate the effective value of the three-phase current in each segment to obtain the effective value of the three-phase current in each segment;

[0030] The maximum value of the effective value of the three-phase current in each segment is selected as the second current after the distribution network communication failure occurs;

[0031] The voltage corresponding to the second current is used as the second voltage.

[0032] Based on the above method embodiment, the present invention provides a corresponding device embodiment.

[0033] An embodiment of the present invention provides a device for identifying the type of communication fault in a distribution network, comprising: a data acquisition module, a feature extraction module, a lightning flashover fault judgment module, and an insulator flashover fault judgment module.

[0034] The data acquisition module is used to obtain the current mode time-frequency matrix and the voltage mode time-frequency matrix before and after the distribution network communication failure occurs;

[0035] The feature extraction module is used to extract the current DC amplitude, the current main harmonic amplitude, the current main harmonic order and the current total frequency band amplitude before and after the communication fault occurs according to the current modulus time-frequency matrix before and after the communication fault occurs; wherein the current main harmonics include the current third harmonic and the current fifth harmonic; according to the voltage modulus time-frequency matrix before and after the communication fault occurs, extract the voltage fundamental amplitude, the voltage main harmonic amplitude and the voltage main harmonic order before and after the communication fault occurs; wherein the voltage main harmonics include the voltage third harmonic and the voltage fifth harmonic;

[0036] The lightning flashover fault judgment module is used to calculate and generate the voltage fundamental wave amplitude decrease rate according to the voltage fundamental wave amplitude before and after the communication fault occurs; when the voltage fundamental wave amplitude decrease rate is greater than a preset decrease rate, the current main harmonic order after the communication fault occurs is greater than a preset first order, the voltage main harmonic order after the communication fault occurs is greater than a preset second order, the current main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, and the voltage main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, it is determined that the distribution network communication fault type is a lightning flashover communication fault;

[0037] The insulator flashover fault judgment module is used to calculate and generate a DC content difference according to the DC amplitude of the current before and after the communication fault occurs; calculate and generate a third harmonic content difference according to the third harmonic amplitude of the current before and after the communication fault occurs; calculate and generate a fifth harmonic content difference according to the fifth harmonic amplitude of the current before and after the communication fault occurs;

[0038] When the DC content difference is greater than a preset first difference, the third harmonic content difference is greater than a preset second difference, and the fifth harmonic content difference is greater than a preset third difference, it is determined that the distribution network communication fault type is an insulator flashover communication fault.

[0039] Further, the data acquisition module includes: a matrix generation unit;

[0040] Obtaining a first current and a first voltage before a distribution network communication fault occurs;

[0041] Acquire a second current and a second voltage after a distribution network communication fault occurs;

[0042] Performing discrete S transformation on the first current and the first voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix before the communication fault occurs;

[0043] Discrete S transform is performed on the second current and the second voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix after the communication fault occurs.

[0044] Further, the obtaining of the first current and the first voltage before the distribution network communication fault occurs includes:

[0045] Obtaining the three-phase current within a preset period of time before the communication failure occurs;

[0046] Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents;

[0047] Perform load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current;

[0048] Calculate the effective value of the three-phase current in each segment and generate the effective value of the three-phase current in each segment;

[0049] Select the maximum value of the effective value of the three-phase current in each segment as the first current before the distribution network communication fault occurs;

[0050] The voltage corresponding to the first current is used as the second voltage.

[0051] Further, the obtaining of the second current and the second voltage after the distribution network communication failure occurs includes:

[0052] Obtaining three-phase current within a preset period of time after a communication failure occurs;

[0053] Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents;

[0054] Perform load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current;

[0055] Calculate the effective value of the three-phase current in each segment to obtain the effective value of the three-phase current in each segment;

[0056] The maximum value of the effective value of the three-phase current in each segment is selected as the second current after the distribution network communication failure occurs;

[0057] The voltage corresponding to the second current is used as the second voltage.

[0058] Based on the above method item embodiments, the present invention provides corresponding electronic device item embodiments.

[0059] An embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for identifying the type of distribution network communication fault as described in any one of the above method embodiments can be implemented.

[0060] Based on the above method item embodiments, the present invention provides a corresponding storage medium item embodiment.

[0061] An embodiment of the present invention provides a storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for identifying the type of communication fault in a distribution network as described in any one of the above method embodiments can be implemented.

[0062] Compared with the prior art, the present invention has the following beneficial effects:

[0063] The present invention obtains the voltage modulus time-frequency matrix before and after the communication failure of the distribution network, extracts the voltage fundamental amplitude, voltage main harmonic amplitude and voltage main harmonic amplitude order before and after the communication failure occurs; obtains the current modulus time-frequency matrix before and after the communication failure of the distribution network, extracts the current DC amplitude, current main harmonic amplitude, current main harmonic amplitude order and current total frequency band amplitude before and after the communication failure occurs; constructs the judgment criteria based on the above parameters, and can effectively identify the lightning flashover communication failure and insulator pollution flashover communication failure in the distribution network. By accurately identifying different types of communication failures, it can provide a more timely and effective maintenance strategy for the power system, reduce the economic losses caused by communication failures, thereby significantly improving the operational reliability of the distribution network and ensuring the safe and stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a flowchart of a method for identifying a type of communication fault in a distribution network provided in one embodiment of the present invention.

[0065] Figure 2 It is a curve diagram of the change relationship between the amplitude of the main harmonics of the current and the order of the main harmonics of the current after a communication fault occurs in the distribution network provided by an embodiment of the present invention.

[0066] Figure 3 The present invention provides an amplitude curve diagram of the voltage fundamental wave amplitude changing with time after a communication failure occurs in a distribution network according to an embodiment of the present invention.

[0067] Figure 4 It is a structural diagram of a device for identifying a type of communication fault in a distribution network provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0068] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0069] like Figure 1 As shown, an embodiment of the present invention provides a method for identifying a type of communication fault in a distribution network, comprising at least the following steps:

[0070] Step S1, obtaining the current mode time-frequency matrix and the voltage mode time-frequency matrix before and after the distribution network communication fault occurs;

[0071] Specifically, in a preferred embodiment, the step of obtaining the current mode time-frequency matrix and the voltage mode time-frequency matrix before and after the distribution network communication fault occurs includes:

[0072] Obtaining a first current and a first voltage before a distribution network communication fault occurs;

[0073] Acquire a second current and a second voltage after a distribution network communication fault occurs;

[0074] Performing discrete S transformation on the first current and the first voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix before the communication fault occurs;

[0075] Discrete S transform is performed on the second current and the second voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix after the communication fault occurs.

[0076] Optionally, the obtaining of a first current and a first voltage before a distribution network communication fault occurs includes:

[0077] Obtaining the three-phase current within a preset period of time before the communication failure occurs;

[0078] Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents;

[0079] Perform load current removal operation on the three-phase current of each section to obtain the corresponding segmented three-phase current;

[0080] Calculate the effective value of the three-phase current in each segment and generate the effective value of the three-phase current in each segment;

[0081] Select the maximum value of the effective value of the three-phase current in each segment as the first current before the distribution network communication fault occurs;

[0082] The voltage corresponding to the first current is used as the first voltage.

[0083] In the above embodiment, the load current removal operation includes:

[0084] The three-phase current of the first cycle is subtracted from the three-phase current of the complete cycle in the segmented three-phase current in equal phases to obtain the corresponding segmented three-phase current.

[0085] Optionally, obtaining a second current and a second voltage after a distribution network communication failure occurs includes:

[0086] Obtaining three-phase current within a preset period of time after a communication failure occurs;

[0087] Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents;

[0088] Perform load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current;

[0089] Calculate the effective value of the three-phase current in each segment to obtain the effective value of the three-phase current in each segment;

[0090] The maximum value of the effective value of the three-phase current in each segment is selected as the second current after the distribution network communication failure occurs;

[0091] The voltage corresponding to the second current is used as the second voltage.

[0092] Exemplarily, the row vectors of the current mode time-frequency matrix and the voltage mode time-frequency matrix are the amplitude of a certain frequency component changing with time, and the column vectors are the amplitudes of each frequency component corresponding to a certain time.

[0093] It can be understood that by obtaining the current mode time-frequency matrix and voltage mode time-frequency matrix before and after the distribution network communication fault occurs, the dynamic changes of current and voltage before and after the fault are accurately captured, and the time domain and frequency domain information are effectively integrated through discrete S transformation, providing a rich data basis for subsequent fault analysis. In particular, in the process of obtaining the first current and the first voltage, the second current and the second voltage, the accuracy and representativeness of the data are ensured by segmenting the three-phase current within the preset time period, removing the load current, and selecting the maximum effective value, which effectively reduces the impact of noise and load changes on fault identification.

[0094] Step S2, according to the current mode time-frequency matrix before and after the communication fault occurs, extract the current DC amplitude, the current main harmonic amplitude, the current main harmonic order and the current total frequency band amplitude before and after the communication fault occurs; wherein the current main harmonics include the current third harmonic and the current fifth harmonic;

[0095] Specifically, in a preferred embodiment, according to the current mode time-frequency matrix before and after the communication failure occurs, the main harmonic amplitude and the main harmonic order of the current after the communication failure occurs are extracted, and the change relationship between the main harmonic amplitude and the main harmonic order of the current after the distribution network communication failure occurs is obtained as follows: Figure 2 shown.

[0096] It can be understood that by deeply analyzing the current mode time-frequency matrix before and after the communication fault occurs, key parameters such as the DC amplitude of the current, the amplitude and order of the main harmonics of the current, and the total frequency band amplitude of the current can be accurately extracted, which comprehensively reflects the dynamic change characteristics of the current before and after the fault, provides an important basis for the accurate identification of the fault type, and improves the accuracy and efficiency of the identification of the distribution network communication fault type.

[0097] Step S3, extracting the voltage fundamental amplitude, voltage main harmonic amplitude and voltage main harmonic order before and after the communication fault occurs according to the voltage modulus time-frequency matrix before and after the communication fault occurs; wherein the voltage main harmonics include the voltage third harmonic and the voltage fifth harmonic;

[0098] Specifically, in a preferred embodiment, according to the voltage modulus time-frequency matrix before and after the communication failure occurs, the voltage fundamental amplitude after the communication failure occurs is extracted, and the amplitude of the voltage fundamental amplitude changing with time after the distribution network communication failure occurs is obtained as follows: Figure 3 shown.

[0099] It is understandable that by deeply analyzing the voltage modulus time-frequency matrix before and after the communication fault occurs, key parameters such as the voltage fundamental amplitude, voltage main harmonic amplitude and its order are accurately extracted. The extraction of these parameters comprehensively and accurately reflects the change of voltage before and after the fault, providing important data support for the subsequent fault type identification.

[0100] Step S4, calculating and generating a voltage fundamental wave amplitude decrease rate according to the voltage fundamental wave amplitude before and after the communication fault occurs;

[0101] Exemplarily, the voltage fundamental amplitude drop rate is calculated by the following formula:

[0102]

[0103] Where R is the voltage fundamental amplitude drop rate; U RSM1 is the voltage fundamental amplitude before the communication fault occurs; U RSM2 is the voltage fundamental amplitude after the communication fault occurs;

[0104] It can be understood that calculating the voltage fundamental amplitude decrease rate based on the voltage fundamental amplitude before and after the communication fault occurs can quantitatively evaluate the changes in voltage during the fault process, intuitively reflect the degree of reduction in voltage amplitude, and provide more reliable protection for the safe and stable operation of the power system.

[0105] Step S5: when the voltage fundamental amplitude decrease rate is greater than a preset decrease rate, the current main harmonic order after the communication fault occurs is greater than a preset first order, the voltage main harmonic order after the communication fault occurs is greater than a preset second order, the current main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, and the voltage main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, it is determined that the distribution network communication fault type is a lightning flashover communication fault;

[0106] Exemplarily, when the voltage fundamental amplitude drop rate is greater than 0.5, the current main harmonic order after the communication fault occurs is greater than 10 times, the voltage main harmonic order after the communication fault occurs is greater than 10 times, the current main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, and the voltage main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, it is determined that the distribution network communication fault type is a lightning flashover communication fault;

[0107] Specifically, in a preferred embodiment, when the voltage fundamental amplitude drop rate is 0.5183, the current main harmonic order after the communication fault occurs is 23 times, the voltage main harmonic order after the communication fault occurs is 28 times, the current main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, and the voltage main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, it is determined that the distribution network communication fault type is a lightning flashover communication fault;

[0108] It is understandable that when the line is struck by lightning and causes communication failure, the main harmonic orders of current and voltage are very high, the amplitude of their high-frequency components is very large, and the amplitude of the voltage fundamental wave drops. This is because when a faulty lightning strike occurs, the high-order harmonics are formed by the superposition of the lightning wave and the fault traveling wave generated by the fault additional voltage, and their high-frequency content is higher than the high-frequency content generated by a simple non-faulty lightning strike.

[0109] Step S6, calculate and generate the DC content difference based on the DC amplitude of the current before and after the communication fault occurs; calculate and generate the third harmonic content difference based on the third harmonic amplitude of the current before and after the communication fault occurs; calculate and generate the fifth harmonic content difference based on the fifth harmonic amplitude of the current before and after the communication fault occurs.

[0110] Optionally, the DC content difference is calculated using the following formula:

[0111]

[0112] Among them, ΔI is the DC content difference; Ia RSM1 Ia is the DC current amplitude before the communication fault occurs; RSM2 is the DC current amplitude after the communication fault occurs; I RSM1 is the total frequency amplitude of the current before the communication fault occurs; I RSM2 is the total frequency amplitude of the current after the communication fault occurs;

[0113] Specifically, the third harmonic content difference is calculated and generated by the following formula:

[0114]

[0115] Among them, ΔTHD3 is the difference of third harmonic content; Ib RMS1 Ib is the third harmonic amplitude of the current before the communication fault occurs; RSM2 is the third harmonic amplitude of the current after the communication fault occurs; I RSM1 is the total frequency amplitude of the current before the communication fault occurs; I RSM2 is the total frequency amplitude of the current after the communication fault occurs;

[0116] Optionally, the fifth harmonic content difference is calculated using the following formula:

[0117]

[0118] Among them, ΔTHD5 is the difference of the fifth harmonic content; Ic RSM1 is the fifth harmonic amplitude of the current before the communication fault occurs; Ic RSM2 is the fifth harmonic amplitude of the current after the communication fault occurs; I RSM1 is the total frequency amplitude of the current before the communication fault occurs; I RSM2 is the total frequency amplitude of the current after the communication fault occurs;

[0119] It can be understood that by calculating the DC content difference of the current DC amplitude before and after the communication fault occurs, the change of the DC component of the current during the fault process is intuitively quantified; secondly, by calculating the difference in the third harmonic content before and after the communication fault, as well as the difference in the fifth harmonic content, accurate information on the change of the current harmonic component is provided, and the current waveform distortion caused by the fault is accurately captured, which helps to identify the type of communication fault.

[0120] Step S7: When the DC content difference is greater than a preset first difference, the third harmonic content difference is greater than a preset second difference, and the fifth harmonic content difference is greater than a preset third difference, determine that the distribution network communication fault type is an insulator flashover communication fault.

[0121] Exemplarily, when the DC content difference is greater than 20%, the third harmonic content difference is greater than 5%, and the fifth harmonic content difference is greater than 5%, it is determined that the distribution network communication fault type is an insulator flashover communication fault.

[0122] Specifically, in a preferred embodiment, the DC content of the current before the distribution network communication fault occurs is 56.8%, the third harmonic content is 6.3%, and the fifth harmonic content is 7.4%; the DC content of the current after the distribution network communication fault occurs is 86.8%, the third harmonic content is 0.36%, and the fifth harmonic content is 0.29%; the difference in the DC content of the current before and after the distribution network communication fault occurs is 30%, the difference in the third harmonic content is 5.94%, and the difference in the fifth harmonic content is 7.11%, and the distribution network communication fault type is determined to be an insulator flashover communication fault.

[0123] It can be understood that by setting the comparison conditions of the DC content difference, the third harmonic content difference and the fifth harmonic content difference with the preset difference, it is possible to accurately and quickly determine whether the type of distribution network communication fault is an insulator flashover communication fault, thereby improving the accuracy and reliability of fault identification, thereby significantly improving the operational reliability of the distribution network and ensuring the safe and stable operation of the power system.

[0124] Based on the above method embodiment, the present invention provides a corresponding device embodiment.

[0125] like Figure 2 As shown, an embodiment of the present invention provides a device for identifying the type of communication fault in a distribution network, including: a data acquisition module 101, a feature extraction module 102, a lightning flashover fault judgment module 103 and an insulator flashover fault judgment module 104.

[0126] The data acquisition module 101 is used to acquire the current mode time-frequency matrix and the voltage mode time-frequency matrix before and after the distribution network communication failure occurs;

[0127] The feature extraction module 102 is used to extract the current DC amplitude, the current main harmonic amplitude, the current main harmonic order and the current total frequency band amplitude before and after the communication fault occurs according to the current modulus time-frequency matrix before and after the communication fault occurs; wherein the current main harmonics include the current third harmonic and the current fifth harmonic; according to the voltage modulus time-frequency matrix before and after the communication fault occurs, extract the voltage fundamental amplitude, the voltage main harmonic amplitude and the voltage main harmonic order before and after the communication fault occurs; wherein the voltage main harmonics include the voltage third harmonic and the voltage fifth harmonic;

[0128] The lightning flashover fault judgment module 103 is used to calculate and generate the voltage fundamental wave amplitude decrease rate according to the voltage fundamental wave amplitude before and after the communication fault occurs; when the voltage fundamental wave amplitude decrease rate is greater than a preset decrease rate, the current main harmonic order after the communication fault occurs is greater than a preset first order, the voltage main harmonic order after the communication fault occurs is greater than a preset second order, the current main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, and the voltage main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, it is determined that the distribution network communication fault type is a lightning flashover communication fault;

[0129] The insulator flashover fault judgment module 104 is used to calculate and generate a DC content difference according to the DC amplitude of the current before and after the communication fault occurs; calculate and generate a third harmonic content difference according to the third harmonic amplitude of the current before and after the communication fault occurs; calculate and generate a fifth harmonic content difference according to the fifth harmonic amplitude of the current before and after the communication fault occurs; when the DC content difference is greater than a preset first difference, the third harmonic content difference is greater than a preset second difference, and the fifth harmonic content difference is greater than a preset third difference, determine that the distribution network communication fault type is an insulator flashover communication fault.

[0130] Preferably, the data acquisition module 101 comprises: a matrix generation unit;

[0131] Obtaining a first current and a first voltage before a distribution network communication fault occurs;

[0132] Acquire a second current and a second voltage after a distribution network communication fault occurs;

[0133] Performing discrete S transformation on the first current and the first voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix before the communication fault occurs;

[0134] Discrete S transform is performed on the second current and the second voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix after the communication fault occurs.

[0135] Optionally, the obtaining of a first current and a first voltage before a distribution network communication fault occurs includes:

[0136] Obtaining the three-phase current within a preset period of time before the communication failure occurs;

[0137] Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents;

[0138] Perform load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current;

[0139] Calculate the effective value of the three-phase current in each segment and generate the effective value of the three-phase current in each segment;

[0140] Select the maximum value of the effective value of the three-phase current in each segment as the first current before the distribution network communication fault occurs;

[0141] The voltage corresponding to the first current is used as the second voltage.

[0142] Specifically, the obtaining of the second current and the second voltage after the distribution network communication failure occurs includes:

[0143] Obtaining three-phase current within a preset period of time after a communication failure occurs;

[0144] Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents;

[0145] Perform load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current;

[0146] Calculate the effective value of the three-phase current in each segment to obtain the effective value of the three-phase current in each segment;

[0147] The maximum value of the effective value of the three-phase current in each segment is selected as the second current after the distribution network communication failure occurs;

[0148] The voltage corresponding to the second current is used as the second voltage.

[0149] It should be noted that the embodiments of the device described above correspond to the above embodiments of the present invention, and can implement any of the methods described above in the present invention. In addition, the embodiments of the above-mentioned device are merely schematic, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0150] Based on the above method embodiment of the present invention, a corresponding electronic device embodiment is provided.

[0151] An embodiment of the present invention provides an electronic device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for identifying the type of communication fault in a distribution network described in any one of the present invention is implemented, or, when the processor executes the computer program, the functions of the modules in the above-mentioned device embodiments are implemented.

[0152] Exemplarily, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program in the terminal device.

[0153] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0154] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0155] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the terminal device by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0156] Based on the above method embodiment, the present invention provides a storage medium embodiment;

[0157] Another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is executed, the device where the storage medium is located is controlled to execute any one of the above-mentioned methods for identifying the type of distribution network communication fault of the present invention.

[0158] The storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0159] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0160] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for identifying the type of distribution network communication fault, characterized in that: include: Obtain the current mode time-frequency matrix and voltage mode time-frequency matrix before and after the distribution network communication fault occurs; According to the current mode time-frequency matrix before and after the communication fault occurs, the DC amplitude of the current, the amplitude of the main harmonics of the current, the order of the main harmonics of the current and the amplitude of the total frequency band of the current before and after the communication fault occurs are extracted; among which, the main harmonics of the current include the third harmonic of the current and the fifth harmonic of the current; According to the voltage modulus time-frequency matrix before and after the communication fault occurs, the voltage fundamental amplitude, voltage main harmonic amplitude and voltage main harmonic order before and after the communication fault occurs are extracted; among which, the voltage main harmonics include voltage third harmonic and voltage fifth harmonic; According to the voltage fundamental wave amplitude before and after the communication fault occurs, the voltage fundamental wave amplitude drop rate is calculated; When the voltage fundamental amplitude decrease rate is greater than the preset decrease rate, the current main harmonic order after the communication fault occurs is greater than the preset first order, the voltage main harmonic order after the communication fault occurs is greater than the preset second order, the current main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, and the voltage main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, it is determined that the distribution network communication fault type is a lightning flashover communication fault; The DC content difference is calculated based on the DC amplitude of the current before and after the communication fault occurs; the third harmonic content difference is calculated based on the third harmonic amplitude of the current before and after the communication fault occurs; the fifth harmonic content difference is calculated based on the fifth harmonic amplitude of the current before and after the communication fault occurs; When the DC content difference is greater than a preset first difference, the third harmonic content difference is greater than a preset second difference, and the fifth harmonic content difference is greater than a preset third difference, it is determined that the distribution network communication fault type is an insulator flashover communication fault.

2. A method for identifying a type of distribution network communication fault according to claim 1, characterized in that: The step of obtaining the current mode time-frequency matrix and the voltage mode time-frequency matrix before and after the distribution network communication fault occurs includes: Obtaining a first current and a first voltage before a distribution network communication fault occurs; Acquire a second current and a second voltage after a distribution network communication fault occurs; Performing discrete S transformation on the first current and the first voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix before the communication fault occurs; Discrete S transform is performed on the second current and the second voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix after the communication fault occurs.

3. A method for identifying a type of distribution network communication fault according to claim 2, characterized in that: The obtaining of the first current and the first voltage before the distribution network communication fault occurs includes: Obtaining the three-phase current within a preset period of time before the communication failure occurs; Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents; Perform load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current; Calculate the effective value of the three-phase current in each segment and generate the effective value of the three-phase current in each segment; Select the maximum value of the effective value of the three-phase current in each segment as the first current before the distribution network communication fault occurs; The voltage corresponding to the first current is used as the first voltage.

4. A method for identifying a type of distribution network communication fault according to claim 2, characterized in that: The obtaining of the second current and the second voltage after the distribution network communication fault occurs includes: Obtaining three-phase current within a preset period of time after a communication failure occurs; Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents; Perform load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current; Calculate the effective value of the three-phase current in each segment to obtain the effective value of the three-phase current in each segment; The maximum value of the effective value of the three-phase current in each segment is selected as the second current after the distribution network communication failure occurs; The voltage corresponding to the second current is used as the second voltage.

5. A device for identifying the type of communication fault in a distribution network, characterized in that: include: Data acquisition module, feature extraction module, lightning flashover fault judgment module and insulator flashover fault judgment module; The data acquisition module is used to obtain the current mode time-frequency matrix and the voltage mode time-frequency matrix before and after the distribution network communication failure occurs; The feature extraction module is used to extract the current DC amplitude, the current main harmonic amplitude, the current main harmonic order and the current total frequency band amplitude before and after the communication fault occurs according to the current modulus time-frequency matrix before and after the communication fault occurs; wherein the current main harmonics include the current third harmonic and the current fifth harmonic; according to the voltage modulus time-frequency matrix before and after the communication fault occurs, extract the voltage fundamental amplitude, the voltage main harmonic amplitude and the voltage main harmonic order before and after the communication fault occurs; wherein the voltage main harmonics include the voltage third harmonic and the voltage fifth harmonic; The lightning flashover fault judgment module is used to calculate and generate the voltage fundamental wave amplitude decrease rate according to the voltage fundamental wave amplitude before and after the communication fault occurs; when the voltage fundamental wave amplitude decrease rate is greater than a preset decrease rate, the current main harmonic order after the communication fault occurs is greater than a preset first order, the voltage main harmonic order after the communication fault occurs is greater than a preset second order, the current main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, and the voltage main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude, it is determined that the distribution network communication fault type is a lightning flashover communication fault; The insulator flashover fault judgment module is used to calculate and generate a DC content difference according to the DC amplitude of the current before and after the communication fault occurs; calculate and generate a third harmonic content difference according to the third harmonic amplitude of the current before and after the communication fault occurs; calculate and generate a fifth harmonic content difference according to the fifth harmonic amplitude of the current before and after the communication fault occurs; when the DC content difference is greater than a preset first difference, the third harmonic content difference is greater than a preset second difference, and the fifth harmonic content difference is greater than a preset third difference, determine that the distribution network communication fault type is an insulator flashover communication fault.

6. The device for identifying the type of communication fault in a power distribution network according to claim 5, characterized in that: The data acquisition module comprises: a matrix generation unit; Obtaining a first current and a first voltage before a distribution network communication fault occurs; Acquire a second current and a second voltage after a distribution network communication fault occurs; Performing discrete S transformation on the first current and the first voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix before the communication fault occurs; Discrete S transform is performed on the second current and the second voltage respectively to obtain a current mode time-frequency matrix and a voltage mode time-frequency matrix after the communication fault occurs.

7. The device for identifying the type of communication fault in a power distribution network according to claim 6, characterized in that: The obtaining of the first current and the first voltage before the distribution network communication fault occurs includes: Obtaining the three-phase current within a preset period of time before the communication failure occurs; Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents; Perform load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current; Calculate the effective value of the three-phase current in each segment and generate the effective value of the three-phase current in each segment; Select the maximum value of the effective value of the three-phase current in each segment as the first current before the distribution network communication fault occurs; The voltage corresponding to the first current is used as the second voltage.

8. The device for identifying the type of communication fault in a power distribution network according to claim 7, characterized in that: The obtaining of the second current and the second voltage after the distribution network communication fault occurs includes: Obtaining three-phase current within a preset period of time after a communication failure occurs; Segmenting the three-phase current according to preset intervals to obtain a plurality of segmented three-phase currents; Perform load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current; Calculate the effective value of the three-phase current in each segment to obtain the effective value of the three-phase current in each segment; The maximum value of the effective value of the three-phase current in each segment is selected as the second current after the distribution network communication failure occurs; The voltage corresponding to the second current is used as the second voltage.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for identifying the type of distribution network communication fault as described in any one of claims 1 to 4 can be implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it can implement the method for identifying the type of distribution network communication fault as described in any one of claims 1 to 4.

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