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

Abstract

The application discloses a power distribution network communication fault type identification method and device, electronic equipment and storage medium, the method comprises the following steps: obtaining the voltage mode time-frequency matrix before and after the occurrence of the power distribution network communication fault, extracting the voltage fundamental wave amplitude, the voltage main harmonic amplitude and the voltage main harmonic amplitude frequency before and after the occurrence of the communication fault; obtaining the current mode time-frequency matrix before and after the occurrence of the power distribution network communication fault, extracting the current direct current amplitude, the current main harmonic amplitude, the current main harmonic amplitude frequency and the current total frequency band amplitude before and after the occurrence of the communication fault; based on the above parameters, a criterion is constructed to determine whether the power distribution network communication fault type is a lightning flashover communication fault or an insulator pollution flashover communication fault. Through the implementation of the application, the lightning flashover communication fault and the insulator pollution flashover communication fault in the power distribution network can be effectively identified, thereby significantly improving the operation reliability of the power distribution network and ensuring the safe and stable operation of the power system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fault identification, and in particular relates to a power distribution network communication fault type identification method and device, electronic equipment and a storage medium. BACKGROUND

[0002] In the power system, the communication fault of the power distribution network is often caused by lightning flashover or insulator pollution flashover. According to statistical data, about 40% to 70% of communication faults are closely related to lightning activities. When lightning strikes the line, the generated large current and voltage can cause serious interference to the communication system, and even cause it to be paralyzed. In comparison, the insulator pollution flashover event has a low occurrence frequency, but it has the characteristics of frequent repetition in a short period of time, which causes a very significant persistent impact on the communication system, and the economic loss caused is often ten times that of lightning accidents.

[0003] The prior art mainly focuses on judging whether a fault occurs when dealing with the communication fault of the power distribution network, and lacks in-depth research on different fault types. This limitation makes it impossible to take corresponding maintenance measures according to the specific type after the fault occurs, resulting in insufficient accuracy of maintenance operations and failing to fully guarantee the safe and stable operation of the power distribution network. SUMMARY

[0004] The embodiments of the present application provide a power distribution network communication fault type identification method, device, electronic equipment and storage medium. By implementing the present application, lightning flashover communication faults and insulator pollution flashover communication faults can be identified, thereby ensuring the safe and stable operation of the power distribution network.

[0005] An embodiment of the present application provides a power distribution network communication fault type identification method, comprising:

[0006] Obtaining current modulus time-frequency matrices and voltage modulus time-frequency matrices before and after the occurrence of the communication fault of the power distribution network;

[0007] According to the current modulus time-frequency matrices before and after the occurrence of the communication fault, the current DC amplitude, the current main harmonic amplitude, the current main harmonic frequency and the current total frequency band amplitude before and after the occurrence of the communication fault are extracted; wherein the current main harmonic includes the third harmonic and the fifth harmonic of the current;

[0008] According to the voltage modulus time-frequency matrices before and after the occurrence of the communication fault, the voltage fundamental wave amplitude, the voltage main harmonic amplitude and the voltage main harmonic frequency before and after the occurrence of the communication fault are extracted; wherein the voltage main harmonic includes the third harmonic and the fifth harmonic of the voltage;

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

[0010] determining that the communication fault type of the power distribution network is a lightning flashover communication fault when the voltage fundamental amplitude reduction rate is greater than a preset reduction rate, the current main harmonic order after the communication fault is greater than a preset first order, the voltage main harmonic order after the communication fault is greater than a preset second order, the current main harmonic amplitude after the communication fault is greater than the current DC amplitude, and the voltage main harmonic amplitude after the communication fault is greater than the current DC amplitude;

[0011] generating a DC content difference value according to the current DC amplitudes before and after the communication fault, generating a third harmonic content difference value according to the current third harmonic amplitudes before and after the communication fault, and generating a fifth harmonic content difference value according to the current fifth harmonic amplitudes before and after the communication fault;

[0012] determining that the communication fault type of the power distribution network is an insulator pollution flashover communication fault when the DC content difference value is greater than a preset first difference value, the third harmonic content difference value is greater than a preset second difference value, and the fifth harmonic content difference value is greater than a preset third difference value.

[0013] Further, the current and voltage time-frequency matrices before and after the communication fault of the power distribution network are obtained, including:

[0014] obtaining a first current and a first voltage before the communication fault of the power distribution network;

[0015] obtaining a second current and a second voltage after the communication fault of the power distribution network;

[0016] discrete S-transforming the first current and the first voltage to obtain the current and voltage time-frequency matrices before the communication fault;

[0017] discrete S-transforming the second current and the second voltage to obtain the current and voltage time-frequency matrices after the communication fault.

[0018] Further, the first current and the first voltage before the communication fault of the power distribution network are obtained, including:

[0019] obtaining three-phase currents in a preset period before the communication fault;

[0020] segmenting the three-phase currents according to a preset interval to obtain a plurality of segmented three-phase currents;

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

[0022] calculating the effective value of each segmented three-phase current to generate a segmented three-phase current effective value;

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

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

[0025] Further, the second current and the second voltage after the communication fault of the power distribution network occurs are obtained, including:

[0026] Obtain the three-phase current in a preset time period after the communication fault occurs;

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

[0028] Remove the load current from each segmented three-phase current to obtain a corresponding segmented three-phase current;

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

[0030] Select the maximum value of the effective value of each segmented three-phase current as the second current after the communication fault of the power distribution network occurs;

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

[0032] On the basis of the above method embodiment, the application correspondingly provides a device embodiment.

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

[0034] The data acquisition module is used to acquire the current modulus time-frequency matrix and the voltage modulus time-frequency matrix before and after the communication fault of the power distribution network occurs;

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

[0036] The lightning flashover fault judgment module is configured to calculate a voltage fundamental wave amplitude drop rate according to voltage fundamental wave amplitudes before and after the communication fault occurs; and determine that the communication fault type of the power distribution network is a lightning flashover communication fault in a case where the voltage fundamental wave amplitude drop rate is greater than a preset drop rate, a current main harmonic number after the communication fault occurs is greater than a preset first number, a voltage main harmonic number after the communication fault occurs is greater than a preset second number, a current main harmonic amplitude after the communication fault occurs is greater than a current DC amplitude, and a voltage main harmonic amplitude after the communication fault occurs is greater than the current DC amplitude.

[0037] The insulator pollution flashover fault judgment module is configured to calculate a DC content difference value according to current DC amplitudes before and after the communication fault occurs; calculate a third harmonic content difference value according to current third harmonic amplitudes before and after the communication fault occurs; and calculate a fifth harmonic content difference value according to current fifth harmonic amplitudes before and after the communication fault occurs.

[0038] In a case where the DC content difference value is greater than a preset first difference value, the third harmonic content difference value is greater than a preset second difference value, and the fifth harmonic content difference value is greater than a preset third difference value, it is determined that the communication fault type of the power distribution network is an insulator pollution flashover communication fault.

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

[0040] A first current and a first voltage before the communication fault of the power distribution network occurs are acquired.

[0041] A second current and a second voltage after the communication fault of the power distribution network occurs are acquired.

[0042] The first current and the first voltage are respectively subjected to discrete S transformation to obtain a current modulus time-frequency matrix and a voltage modulus time-frequency matrix before the communication fault occurs.

[0043] The second current and the second voltage are respectively subjected to discrete S transformation to obtain a current modulus time-frequency matrix and a voltage modulus time-frequency matrix after the communication fault occurs.

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

[0045] Three-phase currents in a preset period before the communication fault occurs are acquired.

[0046] The three-phase currents are segmented according to a preset interval to obtain a plurality of segmented three-phase currents.

[0047] Each segmented three-phase current is subjected to a load current removal operation to obtain a corresponding segmented three-phase current.

[0048] Calculate the effective value of each segmented three-phase current to generate a segmented three-phase current effective value;

[0049] Select the maximum value of each segmented three-phase current effective value as the first current before the communication fault of the power distribution network occurs.

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

[0051] Further, the second current and the second voltage after the communication fault of the power distribution network occurs are obtained, comprising:

[0052] Obtain the three-phase current in a preset time period after the communication fault occurs.

[0053] Segment the three-phase current according to a preset interval to obtain a plurality of segmented three-phase currents.

[0054] Remove the load current from each segmented three-phase current to obtain a corresponding segmented three-phase current.

[0055] Calculate the effective value of each segmented three-phase current to obtain a segmented three-phase current effective value.

[0056] Select the maximum value of each segmented three-phase current effective value as the second current after the communication fault of the power distribution network occurs.

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

[0058] On the basis of the above-mentioned method item embodiment, the present application correspondingly provides an electronic device item embodiment.

[0059] An embodiment of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the computer program, the power distribution network communication fault type identification method in any one of the above-mentioned method item embodiments can be realized.

[0060] On the basis of the above-mentioned method item embodiment, the present application correspondingly provides a storage medium item embodiment.

[0061] An embodiment of the present application provides a storage medium, which stores a computer program, and when the computer program is executed by a processor, the power distribution network communication fault type identification method in any one of the above-mentioned method item embodiments can be realized.

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

[0063] The application obtains voltage modulus time-frequency matrices before and after the communication fault of the power distribution network, extracts voltage fundamental wave amplitudes, voltage main harmonic amplitudes and voltage main harmonic amplitude frequencies before and after the communication fault, obtains current modulus time-frequency matrices before and after the communication fault of the power distribution network, extracts current direct current amplitudes, current main harmonic amplitudes, current main harmonic amplitude frequencies and current total frequency band amplitudes before and after the communication fault, and constructs a criterion based on the above parameters, which can effectively identify lightning flashover communication faults and insulator pollution flashover communication faults in the power distribution network. Through accurate identification of different types of communication faults, more timely and effective maintenance strategies can be provided for the power system, economic losses caused by communication faults are reduced, the operation reliability of the power distribution network is significantly improved, and the safe and stable operation of the power system is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0064] Figure 1 is a flowchart of a power distribution network communication fault type identification method provided by an embodiment of the application.

[0065] Figure 2 is a current main harmonic amplitude and current main harmonic frequency change relationship curve of the power distribution network after a communication fault.

[0066] Figure 3 is an amplitude curve of the voltage fundamental wave amplitude of the power distribution network after a communication fault.

[0067] Figure 4 is a structural schematic diagram of a power distribution network communication fault type identification device provided by an embodiment of the application. DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0069] As shown in Figure 1 , an embodiment of the application provides a power distribution network communication fault type identification method, which at least includes the following steps:

[0070] Step S1, obtaining current modulus time-frequency matrices and voltage modulus time-frequency matrices before and after a communication fault of the power distribution network;

[0071] Specifically, in a preferred embodiment, the obtaining of the current modulus time-frequency matrices and the voltage modulus time-frequency matrices before and after the communication fault of the power distribution network includes:

[0072] obtaining a first current and a first voltage before a communication fault of a power distribution network occurs;

[0073] obtaining a second current and a second voltage after the communication fault of the power distribution network occurs;

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

[0075] performing discrete S transform on the second current and the second voltage respectively to obtain a current modulus time-frequency matrix and a voltage modulus time-frequency matrix after the communication fault occurs.

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

[0077] obtaining three-phase currents in a preset time period before the communication fault occurs;

[0078] segmenting the three-phase currents according to a preset interval to obtain a plurality of segmented three-phase currents;

[0079] performing a load current removing operation on each segment of the three-phase currents to obtain corresponding segmented three-phase currents;

[0080] calculating an effective value of each segmented three-phase current to generate a segmented three-phase current effective value;

[0081] selecting a maximum value of each segmented three-phase current effective value as the first current before the communication fault of the power distribution network occurs;

[0082] taking a voltage corresponding to the first current as the first voltage.

[0083] In the above embodiment, the load current removing operation comprises:

[0084] subtracting a first cycle of three-phase currents from a complete cycle of three-phase currents in the segmented three-phase currents in phase to obtain corresponding segmented three-phase currents.

[0085] Optionally, the obtaining of the second current and the second voltage after the communication fault of the power distribution network occurs comprises:

[0086] obtaining three-phase currents in a preset time period after the communication fault occurs;

[0087] segmenting the three-phase currents according to a preset interval to obtain a plurality of segmented three-phase currents;

[0088] performing a load current removing operation on each segment of the three-phase currents to obtain corresponding segmented three-phase currents;

[0089] calculating an effective value of each segmented three-phase current to obtain a segmented three-phase current effective value;

[0090] The maximum value of the effective value of each segmented three-phase current is selected as a second current after the communication fault of the power distribution network occurs.

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

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

[0093] It can be understood that by obtaining the current modulus time-frequency matrix and the voltage modulus time-frequency matrix before and after the communication fault of the power distribution network occurs, the dynamic changes of the current and the voltage before and after the fault are accurately captured, and the time domain and frequency domain information is effectively fused by the discrete S transform, thereby 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, by segmenting the three-phase current in a preset time period, removing the load current, and selecting the maximum value of the effective value, the accuracy and representativeness of the data are ensured, and the influence of noise and load change on fault identification is effectively reduced.

[0094] In step S2, the current direct current amplitude, the current main harmonic amplitude, the current main harmonic frequency, and the current total frequency band amplitude before and after the communication fault are extracted according to the current modulus time-frequency matrix before and after the communication fault; wherein the current main harmonic includes the third harmonic of the current and the fifth harmonic of the current.

[0095] Specifically, in one preferred embodiment, the current main harmonic amplitude and the current main harmonic frequency after the communication fault are extracted according to the current modulus time-frequency matrix before and after the communication fault, and the change relationship between the current main harmonic amplitude and the current main harmonic frequency after the communication fault of the power distribution network is obtained as shown in Figure 2 .

[0096] It can be understood that by deeply analyzing the current modulus time-frequency matrix before and after the communication fault, the current direct current amplitude, the amplitude and frequency of the current main harmonic, and the current total frequency band amplitude can be accurately extracted, which comprehensively reflects the dynamic change characteristics of the current before and after the fault, provides an important basis for accurate identification of the fault type, and improves the accuracy and efficiency of the communication fault type identification of the power distribution network.

[0097] In step S3, the voltage fundamental wave amplitude, the voltage main harmonic amplitude, and the voltage main harmonic frequency before and after the communication fault are extracted according to the voltage modulus time-frequency matrix before and after the communication fault; wherein the voltage main harmonic includes the third harmonic of the voltage and the fifth harmonic of the voltage.

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

[0099] It can be understood that by deeply analyzing the voltage modulus time-frequency matrix before and after the communication fault occurs, the voltage fundamental wave amplitude, the voltage main harmonic amplitude and the number of times, and other key parameters are accurately extracted. The extraction of these parameters comprehensively and accurately reflects the changes of the voltage before and after the fault, and provides important data support for the subsequent fault type identification.

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

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

[0102]

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

[0104] It can be understood that the voltage fundamental wave amplitude drop rate is calculated based on the voltage fundamental wave amplitude before and after the communication fault occurs, which can quantitatively evaluate the changes of the voltage during the fault process, and intuitively reflect the reduction degree of the voltage amplitude, thereby providing more reliable guarantee for the safe and stable operation of the power system.

[0105] Step S5, determining that the communication fault type of the power distribution network is a lightning flashover communication fault when the voltage fundamental wave amplitude drop rate is greater than a preset drop rate, the main harmonic frequency of the current after the communication fault occurs is greater than a preset first frequency, the main harmonic frequency of the voltage after the communication fault occurs is greater than a preset second frequency, the main harmonic amplitude of the current after the communication fault occurs is greater than the direct current amplitude of the current, and the main harmonic amplitude of the voltage after the communication fault occurs is greater than the direct current amplitude of the current;

[0106] Exemplarily, when the voltage fundamental wave amplitude drop rate is greater than 0.5, the main harmonic frequency of the current after the communication fault occurs is greater than 10 times, the main harmonic frequency of the voltage after the communication fault occurs is greater than 10 times, the main harmonic amplitude of the current after the communication fault occurs is greater than the direct current amplitude of the current, and the main harmonic amplitude of the voltage after the communication fault occurs is greater than the direct current amplitude of the current, it is determined that the communication fault type of the power distribution network 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 is 23, the voltage main harmonic order after the communication fault is 28, the current main harmonic amplitude after the communication fault is greater than the current DC amplitude, and the voltage main harmonic amplitude after the communication fault is greater than the current DC amplitude, it is determined that the communication fault type of the power distribution network is a lightning flashover communication fault.

[0108] It can be understood that when the line is struck by lightning and causes a communication fault, the current main harmonic order and the voltage main harmonic order are high, the amplitude of the high frequency component is large, and the voltage fundamental amplitude drops. This is because when the fault lightning occurs, the high harmonic is superimposed by the lightning wave and the fault additional voltage generated by the fault traveling wave, and the high frequency content is higher than that generated by the non-fault lightning.

[0109] Step S6, according to the current DC amplitude before and after the communication fault, the DC content difference value is calculated; according to the current third harmonic amplitude before and after the communication fault, the third harmonic content difference value is calculated; according to the current fifth harmonic amplitude before and after the communication fault, the fifth harmonic content difference value is calculated.

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

[0111]

[0112] Where, ΔI is the DC content difference value; Ia RSM1 is the current DC amplitude before the communication fault; Ia RSM2 is the current DC amplitude after the communication fault; I RSM1 is the current total frequency band amplitude before the communication fault; I RSM2 is the current total frequency band amplitude after the communication fault;

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

[0114]

[0115] Where, ΔTHD3 is the third harmonic content difference value; Ib RMS1 is the current third harmonic amplitude before the communication fault; Ib RSM2 is the current third harmonic amplitude after the communication fault; I RSM1 is the current total frequency band amplitude before the communication fault; I RSM2 is the current total frequency band amplitude after the communication fault;

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

[0117]

[0118] wherein, ΔTHD5 is the fifth harmonic content difference value; Ic RSM1 is the current fifth harmonic amplitude before the communication fault occurs; Ic RSM2 is the current fifth harmonic amplitude after the communication fault occurs; I RSM1 is the current total band amplitude before the communication fault occurs; I RSM2 is the current total band amplitude after the communication fault occurs;

[0119] It can be understood that by calculating the direct current content difference value of the current direct current amplitude before and after the communication fault, the change of the current direct current component in the fault process is intuitively quantified. Secondly, by calculating the third harmonic content difference value and the fifth harmonic content difference value before and after the communication fault, accurate information about 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 communication fault type.

[0120] Step S7, in the case that the direct current content difference value is greater than the preset first difference value, the third harmonic content difference value is greater than the preset second difference value, and the fifth harmonic content difference value is greater than the preset third difference value, it is determined that the communication fault type of the power distribution network is an insulator pollution flashover communication fault.

[0121] For example, in the case that the direct current content difference value is greater than 20%, the third harmonic content difference value is greater than 5%, and the fifth harmonic content difference value is greater than 5%, it is determined that the communication fault type of the power distribution network is an insulator pollution flashover communication fault.

[0122] Specifically, in one preferred embodiment, the current direct current content before the communication fault of the power distribution network is 56.8%, the third harmonic content is 6.3%, and the fifth harmonic content is 7.4%; the current direct current content after the communication fault of the power distribution network is 86.8%, the third harmonic content is 0.36%, and the fifth harmonic content is 0.29%; the current direct current content difference value before and after the communication fault of the power distribution network is 30%, the third harmonic content difference value is 5.94%, and the fifth harmonic content difference value is 7.11%, and it is determined that the communication fault type of the power distribution network is an insulator pollution flashover communication fault.

[0123] It can be understood that by setting the comparison condition of the direct current content difference value, the third harmonic content difference value, and the fifth harmonic content difference value with the preset difference value, it can be accurately and quickly determined whether the communication fault type of the power distribution network is an insulator pollution flashover communication fault, the accuracy and reliability of fault identification are improved, thereby significantly improving the operation reliability of the power distribution network and ensuring the safe and stable operation of the power system.

[0124] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments.

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

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

[0127] The feature extraction module 102 is used to extract 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 failure, based on the current mode time-frequency matrix before and after the communication failure; wherein, the main harmonics of the current include the third harmonic and the fifth harmonic; and to extract the fundamental amplitude of the voltage, the amplitude of the main harmonics of the voltage, and the order of the main harmonics of the voltage before and after the communication failure, based on the voltage mode time-frequency matrix before and after the communication failure; wherein, the main harmonics of the voltage include the third harmonic and the fifth harmonic.

[0128] The lightning flashover fault judgment module 103 is used to calculate and generate the voltage fundamental amplitude drop rate based on the voltage fundamental amplitude before and after the communication fault occurs; if the voltage fundamental amplitude drop rate is greater than a preset drop rate, the main harmonic order of the current after the communication fault occurs is greater than a preset first order, the main harmonic order of the voltage after the communication fault occurs is greater than a preset second order, the main harmonic amplitude of the current after the communication fault occurs is greater than the DC current amplitude, and the main harmonic amplitude of the voltage after the communication fault occurs is greater than the DC current amplitude, the distribution network communication fault type is determined to be a lightning flashover communication fault.

[0129] The insulator flashover fault judgment module 104 is used to calculate and generate a DC content difference based on the DC current amplitude before and after the communication fault occurs; calculate and generate a third harmonic content difference based on the third harmonic current amplitude before and after the communication fault occurs; calculate and generate a fifth harmonic content difference based on the fifth harmonic current amplitude before and after the communication fault occurs; and determine the distribution network communication fault type as an insulator flashover communication fault if 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.

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

[0131] Obtain the first current and first voltage before the distribution network communication fault occurs;

[0132] obtaining a second current and a second voltage after the communication fault of the power distribution network occurs;

[0133] discrete S-transforming the first current and the first voltage respectively to obtain a current modulus time-frequency matrix and a voltage modulus time-frequency matrix before the communication fault of the power distribution network occurs;

[0134] discrete S-transforming the second current and the second voltage respectively to obtain a current modulus time-frequency matrix and a voltage modulus time-frequency matrix after the communication fault of the power distribution network occurs.

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

[0136] obtaining three-phase currents in a preset time period before the communication fault occurs;

[0137] segmenting the three-phase currents according to a preset interval to obtain a plurality of segmented three-phase currents;

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

[0139] calculating an effective value of each segmented three-phase current to generate a segmented three-phase current effective value;

[0140] selecting a maximum value of each segmented three-phase current effective value as the first current before the communication fault of the power distribution network occurs;

[0141] taking a voltage corresponding to the first current as the second voltage.

[0142] Specifically, the obtaining of the second current and the second voltage after the communication fault of the power distribution network occurs comprises:

[0143] obtaining three-phase currents in a preset time period after the communication fault occurs;

[0144] segmenting the three-phase currents according to a preset interval to obtain a plurality of segmented three-phase currents;

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

[0146] calculating an effective value of each segmented three-phase current to obtain a segmented three-phase current effective value;

[0147] selecting a maximum value of each segmented three-phase current effective value as the second current after the communication fault of the power distribution network occurs;

[0148] taking a voltage corresponding to the second current as the second voltage.

[0149] It should be noted that the above-described embodiments of the apparatus correspond to the above-described embodiments of the application, and can implement any of the above-described methods of the application. In addition, the above-described embodiments of the apparatus are merely illustrative, and the modules described as separate components can or can not be physically separated, and the components displayed as modules can or can not be physical units, i.e., can be located in one place or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment. In addition, the connection relationship between the modules in the apparatus embodiment provided by the application indicates that there is a communication connection between them, which can be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement it without creative labor.

[0150] On the basis of the above-described method embodiments of the application, an electronic device embodiment is provided.

[0151] An embodiment of the application provides an electronic device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, when the computer program is executed by the processor, a power distribution network communication fault type identification method according to any one of the embodiments of the application is implemented, or when the computer program is executed by the processor, the functions of the modules in the above-described apparatus embodiments are implemented.

[0152] For example, the computer program can be divided into one or more modules, which are stored in the memory and executed by the processor to complete the application. The one or more modules can be a series of computer program instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program in the terminal device.

[0153] The terminal device can be a desktop computer, a notebook computer, a palm computer, a cloud server, and other computing devices. The terminal device can include, but is not limited to, a processor and a memory.

[0154] The processor can be a central processing unit (CPU), and can also be 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 can be a microprocessor or the processor can also be any conventional processor. The processor is a control center of the terminal device, and connects all parts of the terminal device through various interfaces and lines.

[0155] The memory can be used to store the computer program and / or modules, and the processor realizes various functions of the terminal device by running or executing the computer program and / or modules stored in the memory, and calling data stored in the memory. The memory can mainly include a program storage area and a data storage area. The program storage area can store an operating system, at least one application program required by 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 nonvolatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state memory devices.

[0156] On the basis of the above-mentioned method embodiment, the application provides a storage medium embodiment;

[0157] Another embodiment of the application provides a storage medium, which comprises a stored computer program. When the computer program runs, the device where the storage medium is located performs the power distribution network communication fault type identification method of any one of the above-mentioned embodiments of the application.

[0158] The storage medium is a computer readable storage medium, and the computer program includes computer program code in the form of source code, object code, an executable file, or some intermediate form, etc. The computer readable medium can include any entity or device capable of carrying the computer program code, a recording medium, a U disk, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content included in the computer readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in a jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer readable medium does not include an electrical carrier signal and a telecommunication signal.

[0159] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection 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 can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0160] The above is the preferred embodiment of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also considered within the scope of protection of the present application.

Claims

1. A method for identifying a communication fault type of a power distribution network, characterized in that, include: Obtain the first current and first voltage before the distribution network communication fault occurs; Acquire the second current and second voltage after a communication fault occurs in the power distribution network; Discrete S-transforms are performed on the first current and the first voltage respectively to obtain the current-mode time-frequency matrix and the voltage-mode time-frequency matrix before the communication failure occurred. By performing discrete S-transforms on the second current and the second voltage respectively, the current-mode time-frequency matrix and the voltage-mode time-frequency matrix after the communication failure are obtained. Based on the current mode time-frequency matrix before and after the communication failure, 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 are extracted before and after the communication failure; among them, the main harmonics of the current include the third harmonic and the fifth harmonic. Based on the voltage modulus time-frequency matrix before and after the communication failure, the voltage fundamental amplitude, voltage major harmonic amplitude, and voltage major harmonic order are extracted before and after the communication failure; among them, the voltage major harmonics include the third harmonic and the fifth harmonic. Calculate the voltage fundamental amplitude decrease rate based on the voltage fundamental amplitude before and after the communication failure. If the voltage fundamental amplitude drop rate is greater than the preset drop rate, the main harmonic order of the current after the communication fault is greater than the preset first order, the main harmonic order of the voltage after the communication fault is greater than the preset second order, the main harmonic amplitude of the current after the communication fault is greater than the DC current amplitude, and the main harmonic amplitude of the voltage after the communication fault is greater than the DC current amplitude, then the distribution network communication fault type is determined to be a lightning flashover communication fault. The difference in DC content is calculated based on the DC current amplitude before and after the communication failure; the difference in third harmonic content is calculated based on the third harmonic current amplitude before and after the communication failure; and the difference in fifth harmonic content is calculated based on the fifth harmonic current amplitude before and after the communication failure. If the difference in DC content is greater than the preset first difference, the difference in third harmonic content is greater than the preset second difference, and the difference in fifth harmonic content is greater than the preset third difference, the distribution network communication fault type is determined to be an insulator flashover communication fault.

2. The method of claim 1, wherein, The acquisition of the first current and first voltage before the occurrence of the distribution network communication fault includes: Acquire the three-phase current within a preset time period before the communication failure occurs; The three-phase current is divided into segments according to a preset interval to obtain several segmented three-phase currents; Remove the load current from the three-phase current after each segment 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. The maximum effective value of the three-phase current in each segment is selected as the first current before the distribution network communication fault occurs. The voltage corresponding to the first current is taken as the first voltage.

3. The method of claim 1, wherein the method further comprises: The acquisition of the second current and second voltage after a power distribution network communication fault occurs includes: Acquire the three-phase current within a preset time period after a communication failure occurs; The three-phase current is divided into segments according to a preset interval to obtain several segmented three-phase currents; Remove the load current from the three-phase current after each segment to obtain the corresponding segmented three-phase current; Calculate the effective value of each segmented three-phase current to obtain the segmented three-phase current effective value; Select the maximum value of each segmented three-phase current effective value as the second current after the communication fault of the power distribution network occurs; The voltage corresponding to the second current is taken as the second voltage.

4. An apparatus for identifying a communication fault type of a power distribution network, characterized by, It comprises: a data acquisition module, a feature extraction module, a lightning flashover fault judgment module, and an insulator pollution flashover fault judgment module; The data acquisition module is used to acquire the first current and the first voltage before the communication fault of the power distribution network occurs, and to acquire the second current and the second voltage after the communication fault of the power distribution network occurs; discrete S transformation is performed on the first current and the first voltage respectively to obtain the current modulus time-frequency matrix and the voltage modulus time-frequency matrix before the communication fault occurs; discrete S transformation is performed on the second current and the second voltage respectively to obtain the current modulus time-frequency matrix and the voltage modulus time-frequency matrix after the communication fault occurs; The feature extraction module is used to extract the current direct current amplitude, the current main harmonic amplitude, the current main harmonic frequency, 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 harmonic includes the current third harmonic and the current fifth harmonic; the voltage fundamental wave amplitude, the voltage main harmonic amplitude, and the voltage main harmonic frequency before and after the communication fault occur are extracted according to the voltage modulus time-frequency matrix before and after the communication fault occurs; wherein the voltage main harmonic includes the voltage third harmonic and the voltage fifth harmonic; The lightning flashover fault judgment module is used to calculate the voltage fundamental wave amplitude drop rate according to the voltage fundamental wave amplitude before and after the communication fault occurs; in the case that the voltage fundamental wave amplitude drop rate is greater than a preset drop rate, the current main harmonic frequency after the communication fault is greater than a preset first frequency, the voltage main harmonic frequency after the communication fault is greater than a preset second frequency, the current main harmonic amplitude after the communication fault is greater than the current direct current amplitude, and the voltage main harmonic amplitude after the communication fault is greater than the current direct current amplitude, it is determined that the communication fault type of the power distribution network is lightning flashover communication fault; The insulator pollution flashover fault judgment module is used to calculate the direct current content difference value according to the current direct current amplitude before and after the communication fault occurs; calculate the third harmonic content difference value according to the current third harmonic amplitude before and after the communication fault occurs; calculate the fifth harmonic content difference value according to the current fifth harmonic amplitude before and after the communication fault occurs; in the case that the direct current content difference value is greater than a preset first difference value, the third harmonic content difference value is greater than a preset second difference value, and the fifth harmonic content difference value is greater than a preset third difference value, it is determined that the communication fault type of the power distribution network is insulator pollution flashover communication fault.

5. The power distribution grid communication fault type identification device of claim 4, wherein, The first current and the first voltage before the communication fault of the power distribution network occur are acquired, which comprises: acquiring the three-phase current within a preset period before the communication fault occurs; segmenting the three-phase current according to a preset interval to obtain a plurality of segmented three-phase currents; performing a load current removal operation on each segmented three-phase current to obtain the corresponding segmented three-phase current; calculate the effective value of each segmented three-phase current to generate the segmented three-phase current effective value; selecting a maximum value of the effective value of each segmented three-phase current as the first current before the communication fault of the power distribution network occurs; taking the voltage corresponding to the first current as the second voltage.

6. The power distribution grid communication fault type identification device of claim 5, wherein, The second current and the second voltage after the communication fault of the power distribution network occurs are obtained by: obtaining three-phase currents in a preset time period after the communication fault occurs; segmenting the three-phase currents according to a preset interval to obtain segmented three-phase currents; performing a load current removal operation on each segmented three-phase current to obtain corresponding segmented three-phase currents; calculating the effective value of each segmented three-phase current to obtain the effective value of the segmented three-phase current; selecting a maximum value of the effective value of each segmented three-phase current as the second current after the communication fault of the power distribution network occurs; taking the voltage corresponding to the second current as the second voltage.

7. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that: The processor executes the computer program to implement the power distribution network communication fault type identification method in any one of claims 1 to 3.

8. A storage medium having stored thereon a computer program, characterized in that: The computer program is executed by the processor to implement the power distribution network communication fault type identification method in any one of claims 1 to 3.

Images