Method, device and readable storage medium for determining fault information of power distribution network

Abstract

The application discloses a kind of power distribution network fault information determination method, device and readable storage medium.Therein, the method includes: in response to the failure of power distribution network, obtain the fault traveling wave signal of power distribution network;Fault traveling wave signal is converted into communication message;Extract time intensity information from communication message, wherein, time intensity information is used to indicate the time when fault traveling wave signal arrives the bus detection point of power distribution network, the time length of fault traveling wave propagation and the signal intensity of fault traveling wave signal;Based on time intensity information, determine the fault information of fault.The application solves the technical problem of low detection efficiency of power distribution network fault information.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of active power distribution network traveling wave positioning, in particular to a method and device for determining fault information of a power distribution network and a readable storage medium. BACKGROUND

[0002] At present, the importance of power distribution network fault positioning lies in ensuring the stable operation and safety of the power system. When a fault occurs in the power distribution network, if the fault cannot be located and repaired in time, it may cause power interruption, affect normal power use of users, and even cause serious accidents such as fire. Therefore, timely and accurate positioning of the power distribution network fault is of great importance to ensure the normal operation of the power system and the safety of user power use. At the same time, through the analysis and summary of fault positioning, the reliability and stability of the power distribution network can be improved, the possibility of fault occurrence can be reduced, and the operation efficiency and safety of the power grid can be improved. Therefore, the importance of power distribution network fault positioning is self-evident and needs to be highly valued and handled in time.

[0003] In related technologies, due to the characteristics of weak fault traveling wave amplitude, fast attenuation, short duration and the like of the power distribution network, the traditional fault traveling wave detection device still has problems such as weak output traveling wave signal amplitude, insufficient transformation precision and the like. At the same time, due to the difficulty of single communication mode to cover the entire power distribution network, the power distribution network fault traveling wave detection terminal has communication blind spots when transmitting data, which causes the fault traveling wave information transmission to be blocked, further affecting the effective use of the fault traveling wave information. Therefore, under the background of the integration of various communication technologies in the intelligent power distribution network, according to the "suitability" principle, the appropriate communication technology is selected, and the traveling wave signal detection method and the power distribution network fault positioning method based on the traveling wave method are researched, which is beneficial to improve the disposal efficiency of the power distribution network line fault and promote the construction of strong and intelligent power distribution network in China. Therefore, there is a technical problem of low efficiency of power distribution network fault information detection.

[0004] At present, no effective solution has been proposed for the above-mentioned technical problem of low efficiency of power distribution network fault information detection. SUMMARY

[0005] The embodiments of the present application provide a method and device for determining fault information of a power distribution network and a readable storage medium to at least solve the technical problem of low efficiency of power distribution network fault information detection.

[0006] According to an aspect of some embodiments of the present application, a method for determining fault information of a power distribution network is provided. The method can include: in response to a fault occurring in the power distribution network, obtaining a fault traveling wave signal of the power distribution network; converting the fault traveling wave signal into a communication message; extracting time-intensity information from the communication message, wherein the time-intensity information is used to indicate a time when the fault traveling wave signal reaches a bus detection point of the power distribution network, a time length of the fault traveling wave propagation, and a signal intensity of the fault traveling wave signal; and determining the fault information of the fault based on the time-intensity information.

[0007] Optionally, the obtaining of the fault traveling wave signal of the power distribution network in response to the fault occurring in the power distribution network includes: in response to the fault occurring in the power distribution network, obtaining an adjustment parameter, wherein the adjustment parameter is used to indicate a numerical value for adjusting the collection device; adjusting the collection device based on the adjustment parameter; and obtaining the fault traveling wave signal based on the adjusted collection device.

[0008] Optionally, the extracting of the time-intensity information from the communication message includes: extracting fault traveling wave amplitude information and time information from the communication message, wherein the fault traveling wave amplitude information is used to indicate the signal intensity of the fault traveling wave signal, and the time information is used to indicate the time when the fault traveling wave reaches the bus detection point of the power distribution network and / or the time length of the fault traveling wave propagation; and integrating the fault traveling wave amplitude information and the time information to obtain the time-intensity information.

[0009] Optionally, before the determining of the fault information of the fault based on the time-intensity information, the method for determining the fault information of the power distribution network further includes: performing an enhancement processing on the time-intensity information to obtain enhanced time-intensity information.

[0010] Optionally, the method for determining the fault information of the power distribution network further includes: obtaining a transmission strategy of the communication message; in response to the transmission strategy being a first transmission strategy, obtaining a transmission result, wherein the first transmission strategy is used to indicate optical fiber and / or wireless transmission; and determining a target transmission strategy of the communication message based on the transmission result, wherein the target transmission strategy is used to indicate a rule for transmitting the communication message.

[0011] Optionally, the determining of the target transmission strategy of the communication message based on the transmission result includes: in response to the transmission result being a transmission success, determining that the target transmission strategy is the first transmission strategy; and in response to the transmission result being a transmission failure, determining that the target transmission strategy is a second transmission strategy, wherein the second transmission strategy is used to indicate power line transmission.

[0012] According to another aspect of the embodiments of the present application, a device for determining fault information of a power distribution network is also provided. The device can include: an acquisition unit configured to acquire a fault traveling wave signal of the power distribution network in response to a fault of the power distribution network; a conversion unit configured to convert the fault traveling wave signal into a communication message; an extraction unit configured to extract time-intensity information from the communication message, wherein the time-intensity information is used to indicate a time when the fault traveling wave signal reaches a bus detection point of the power distribution network, a time length of the fault traveling wave propagation, and a signal intensity of the fault traveling wave signal; and a determination unit configured to determine the fault information of the fault based on the time-intensity information.

[0013] According to another aspect of the embodiments of the present application, a computer readable storage medium is also provided, which includes a stored program, wherein the program, when executed by a processor, controls a device where the storage medium is located to perform the method for determining fault information of a power distribution network in the embodiments of the present application.

[0014] According to another aspect of the embodiments of the present application, a processor is also provided. The processor is configured to execute a program, wherein the program, when executed, performs the method for determining fault information of a power distribution network in the embodiments of the present application.

[0015] According to another aspect of the embodiments of the present application, a computer program product is also provided. The program product includes computer instructions, which, when executed by a processor, implement the method for determining fault information of a power distribution network in the embodiments of the present application.

[0016] In the embodiments of the present application, in response to a fault of a power distribution network, a fault traveling wave signal of the power distribution network is acquired; the fault traveling wave signal is converted into a communication message; time-intensity information is extracted from the communication message, wherein the time-intensity information is used to indicate a time when the fault traveling wave signal reaches a bus detection point of the power distribution network, a time length of the fault traveling wave propagation, and a signal intensity of the fault traveling wave signal; and the fault information of the fault is determined based on the time-intensity information. That is, the embodiments of the present application determine the time-intensity information of the fault traveling wave signal by processing the fault traveling wave signal of the power distribution network, determine the fault information of the fault according to the time-intensity information, and thus solve the technical problem of low detection efficiency of fault information of the power distribution network, and achieve the technical effect of improving the detection efficiency of fault information of the power distribution network. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application. In the drawings:

[0018] Figure 1 is a flowchart of a method for determining fault information of a power distribution network according to the embodiments of the present application;

[0019] Figure 2 FIG. 1 is a flow chart of a fault traveling wave detection method based on an integrated capacitive coupler according to an embodiment of the present application;

[0020] Figure 3 FIG. 2 is a structural schematic diagram of a fault traveling wave detection system based on an integrated capacitive coupler according to an embodiment of the present application;

[0021] Figure 4 FIG. 3 is a schematic diagram of comparison between an initial traveling wave and the initial traveling wave after differential amplification according to an embodiment of the present application;

[0022] Figure 5 FIG. 4 is a schematic diagram of carrier communication at the end of a distribution network according to an embodiment of the present application;

[0023] FIG. 6 is a schematic diagram of a power frequency zero-crossing carrier communication encoding mode according to an embodiment of the present application;

[0024] Figure 7 FIG. 7 is a schematic diagram of sine carrier template matching according to an embodiment of the present application;

[0025] Figure 8 FIG. 8 is a schematic diagram of signal noise differentiation comparison according to an embodiment of the present application;

[0026] Figure 9 FIG. 9 is a schematic diagram of a 10kV real distribution network test field line topology structure according to an embodiment of the present application;

[0027] FIG. 10 is a schematic diagram of sensor waveform detection comparison results according to an embodiment of the present application;

[0028] Figure 11 FIG. 11 is a schematic diagram of a fault information determination device of a distribution network according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0030] It is to be understood that the terms "first", "second", and the like, used in the description and the claims of the present application as well as the above description of the drawings merely refer to different categories and do not necessarily imply a sequence or order of, for example, implementation, unless explicitly stated otherwise. It is to be understood that the use of the term "or" in the description or the claims of the present application has the same meaning as "and / or" unless stated otherwise. Similarly, it is to be understood that use of the phrases such as one of, one or the other of, and the like, does not exclude the combination of all of the listed items. It is to be understood that the use of the term "including", "comprising" or "having" of one step or unit in a process, method, system, functional means or apparatus, does not exclude additional steps or units which are not clearly listed, or which are inherent to such process, method, system, functional means or apparatus.

[0031] According to an embodiment of the present application, an embodiment of a method for determining fault information of a power distribution network is provided. It is to be understood that the steps shown in the flowcharts of the drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0032] Figure 1 is a flowchart of a method for determining fault information of a power distribution network according to an embodiment of the present application, as shown in Figure 1 The method can include the following steps:

[0033] Step S101, in response to a fault occurring in the power distribution network, acquiring a fault traveling wave signal of the power distribution network.

[0034] In the technical solution provided by step S101 of the present application, the fault traveling wave signal can also be referred to as fault traveling wave information.

[0035] In this embodiment, when a fault occurs in the power distribution network, a fault traveling wave signal of the power distribution network is acquired. For example, the fault traveling wave signal of the power distribution network is acquired through an integrated capacitive coupler, which is merely an example and does not limit the specific method of acquiring the fault traveling wave signal of the power distribution network.

[0036] For example, one traveling wave detection device is configured at the beginning and the end of each main line of the active power distribution network. The fault traveling wave acquisition device is equipped with a power line carrier communication module, an optical fiber communication module and a wireless communication module, and the device has a differential amplification function for the acquired fault voltage traveling wave. After the fault occurs, the traveling wave signal detection device is synchronized by GPS / Beidou satellite, and the fault traveling wave signal of the power distribution network is acquired.

[0037] Step S102, converting the fault traveling wave signal into a communication message.

[0038] In the technical solution provided in the step S102 of the present application, after the fault traveling wave signal of the power distribution network is acquired in the step S101, the fault traveling wave signal is converted into a communication message.

[0039] In this embodiment, the fault traveling wave signal is converted into a communication message by a hardware circuit. The communication message at least includes the fault traveling wave amplitude and time information.

[0040] For example, the fault traveling wave information detected by the integrated capacitive coupler is converted into a communication message through subsequent hardware circuit processing.

[0041] In the step S103, time intensity information is extracted from the communication message.

[0042] In the technical solution provided in the step S103 of the present application, the time intensity information is used to indicate the time when the fault traveling wave signal reaches the bus detection point of the power distribution network, the time length of the fault traveling wave propagation, and the signal intensity of the fault traveling wave signal.

[0043] In this embodiment, after the fault traveling wave signal is converted into a communication message in the step S102, the time intensity information is extracted from the communication message. The time intensity information at least includes the fault traveling wave amplitude and time information of the fault traveling wave signal.

[0044] For example, according to the format and protocol of the communication message, the related information of the fault traveling wave signal is parsed, including the fault traveling wave amplitude and time information. The fault traveling wave amplitude is extracted by finding the corresponding field or data in the communication message and parsing the amplitude of the fault traveling wave signal. The fault traveling wave amplitude usually represents the intensity of the signal. The time information is extracted by finding the corresponding time field or data in the communication message and parsing the time information of the fault traveling wave signal. The time information can include the generation time and propagation time of the signal.

[0045] In the step S104, the fault information of the fault is determined based on the time intensity information.

[0046] In the technical solution provided in the step S104 of the present application, the fault information at least includes the fault location, fault type, transition resistance, and noise interference.

[0047] In this embodiment, after the time intensity information is extracted from the communication message in the step S103, the fault information of the fault is determined according to the time intensity information. For example, the time intensity information is sorted to realize fault branch determination and accurate positioning of the fault point.

[0048] For example, the integrated capacitive coupler is used to realize reliable detection of the fault traveling wave. The integrated capacitive coupler can realize traveling wave data transmission by power line carrier communication, and has stronger adaptability in the power distribution network scene in remote areas.

[0049] It should be noted that the above embodiment can be executed by the fault information determination device of the power distribution network.

[0050] The steps S101 to S104 of the present application, in response to the fault of the power distribution network, acquire the fault traveling wave signal of the power distribution network; convert the fault traveling wave signal into a communication message; extract time intensity information from the communication message, wherein the time intensity information is used to indicate the time when the fault traveling wave signal reaches the bus detection point of the power distribution network, the time length of the fault traveling wave propagation and the signal intensity of the fault traveling wave signal; based on the time intensity information, determine the fault information of the fault. That is, the embodiment of the present application determines the time intensity information of the fault traveling wave signal by processing the fault traveling wave signal of the power distribution network, and determines the fault information of the fault according to the time intensity information, thereby solving the technical problem of low detection efficiency of the fault information of the power distribution network, and achieving the technical effect of improving the detection efficiency of the fault information of the power distribution network.

[0051] The above method of the embodiment will be further introduced below.

[0052] As an optional embodiment, in response to the fault of the power distribution network, acquiring the fault traveling wave signal of the power distribution network comprises: in response to the fault of the power distribution network, acquiring an adjustment parameter, wherein the adjustment parameter is used to indicate the numerical value of adjusting the collection device; based on the adjustment parameter, adjusting the collection device; based on the adjusted collection device, acquiring the fault traveling wave signal.

[0053] In this embodiment, when the power distribution network fails, the fault needs to be located, and based on this, the adjustment parameter is acquired. The adjustment parameter can be the coupling capacitance of the integrated capacitive coupler and the tuner capacitance value.

[0054] Optionally, after acquiring the adjustment parameter, the collection device is adjusted according to the adjustment parameter to acquire the fault traveling wave signal.

[0055] For example, the coupling capacitance has a differential effect on the fault traveling wave signal while realizing the transmission of high-frequency traveling wave signals, as shown in the following formula (1):

[0056]

[0057] Wherein, C C is the equivalent capacitance value of the coupling capacitance of the integrated capacitive coupler and the tuner; US is the voltage traveling wave signal in the primary side line, and i1 is the current flowing through the coupling capacitor. The collection device is adjusted according to the determined coupling capacitance and tuner capacitance value.

[0058] As an optional embodiment, the time-intensity information is extracted from the communication message, including: extracting fault traveling wave amplitude information and time information from the communication message, wherein the fault traveling wave amplitude information is used to indicate the signal intensity of the fault traveling wave signal, and the time information is used to indicate the time when the fault traveling wave reaches the bus detection point of the power distribution network and / or the time length of the fault traveling wave propagation; and integrating the fault traveling wave amplitude information and the time information to obtain the time-intensity information.

[0059] In this embodiment, the fault traveling wave amplitude information and the time information are extracted from the communication message. For example, according to the format and protocol of the communication message, the fault traveling wave amplitude information and the time information are parsed.

[0060] Optionally, after the fault traveling wave amplitude information and the time information are extracted, the fault traveling wave amplitude information and the time information are integrated to obtain the time-intensity information.

[0061] For example, the integration process can be performed by placing the fault traveling wave amplitude information and the time information together to form a data structure or a table. The time-intensity information can include the amplitude of the fault traveling wave and the corresponding time point, so as to facilitate subsequent analysis and processing. For example, the amplitude information and the time information can be stored in a two-dimensional array, wherein each row represents a time point and includes time information and amplitude information. In addition, the time information and the amplitude information can also be stored in a dictionary or other data structure, so as to facilitate indexing and searching according to the time point.

[0062] As an optional embodiment, before the fault information of the fault of the power distribution network is determined based on the time-intensity information, the method for determining the fault information of the power distribution network further includes: performing enhancement processing on the time-intensity information to obtain enhanced time-intensity information.

[0063] In this embodiment, the enhancement processing is performed on the time-intensity information to obtain the enhanced time-intensity information. For example, the fault traveling wave amplitude information is amplified.

[0064] For example, the fault traveling wave amplitude after the coupling capacitor differentiation will be amplified by times, and the higher the frequency is, the higher the amplification degree will be.

[0065] As an optional embodiment, the method for determining the fault information of the power distribution network further includes: obtaining a transmission strategy of the communication message; in response to the transmission strategy being a first transmission strategy, obtaining a transmission result, wherein the first transmission strategy is used to indicate optical fiber and / or wireless transmission; and based on the transmission result, determining a target transmission strategy of the communication message, wherein the target transmission strategy is used to indicate a rule of transmitting the communication message.

[0066] In this embodiment, when the transmission strategy is the first transmission strategy, it is explained that the transmission strategy here is optical fiber communication and wireless communication. In order to avoid errors in the transmission process, the transmission result is analyzed, and based on this, the transmission result is obtained.

[0067] Optionally, after obtaining the transmission result, the transmission result is analyzed to determine the target transmission strategy of the communication message. The specific determination method is as follows.

[0068] As an optional embodiment, based on the transmission result, the target transmission strategy of the communication message is determined, including: in response to the transmission result being transmission success, determining the target transmission strategy as the first transmission strategy; and in response to the transmission result being transmission failure, determining the target transmission strategy as the second transmission strategy, wherein the second transmission strategy is used to indicate power line transmission.

[0069] In this embodiment, when the transmission result is transmission success, it is explained that the current transmission strategy can correctly transmit data, and based on this, the target transmission strategy is determined as the first transmission strategy.

[0070] Optionally, when the transmission result is transmission failure, it is explained that the current transmission strategy cannot correctly transmit data, and based on this, the target transmission strategy is determined as the second transmission strategy.

[0071] For example, when optical fiber communication and wireless communication fail, power line transmission can be used to transmit fault traveling wave information to the signal coverage area, that is, the second transmission strategy is adopted.

[0072] It should be noted that the above embodiments can be executed by a fault information determination device of a power distribution network.

[0073] In this embodiment, in response to a fault occurring in the power distribution network, a fault traveling wave signal of the power distribution network is obtained; the fault traveling wave signal is converted into a communication message; time intensity information is extracted from the communication message, wherein the time intensity information is used to indicate a time when the fault traveling wave signal arrives at a bus detection point of the power distribution network, a time length of fault traveling wave propagation, and a signal intensity of the fault traveling wave signal; and based on the time intensity information, fault information of the fault is determined. That is, the embodiment of the present application determines the time intensity information of the fault traveling wave signal by processing the fault traveling wave signal of the power distribution network, and then determines the fault information of the fault according to the time intensity information, thereby solving the technical problem of low detection efficiency of fault information of the power distribution network and achieving the technical effect of improving the detection efficiency of fault information of the power distribution network.

[0074] The technical solutions of the embodiments of the present application will be described below in conjunction with preferred embodiments.

[0075] At present, the importance of power distribution network fault location lies in ensuring the stable operation and safety of the power system. When the power distribution network fails, if the fault cannot be located and repaired in time, it may cause power interruption, affect the normal use of electricity by users, and even cause serious accidents such as fire. Therefore, timely and accurate location of power distribution network fault is of great importance to ensure the normal operation of the power system and the safety of user electricity. At the same time, through the analysis and summary of fault location, the reliability and stability of the power distribution network can be improved, the possibility of fault occurrence can be reduced, and the operation efficiency and safety of the power grid can be improved. Therefore, the importance of power distribution network fault location is self-evident, and it needs to be highly valued and handled in time.

[0076] In related technologies, due to the characteristics of weak fault traveling wave amplitude, fast attenuation, short duration and the like of the power distribution network, the traditional fault traveling wave detection device still has problems such as weak output traveling wave signal amplitude, insufficient transformation precision and the like. At the same time, due to the difficulty of single communication mode to cover the entire power distribution network, the power distribution network fault traveling wave detection terminal has communication blind spots when transmitting data, which causes the transmission of fault traveling wave information to be blocked, further affecting the effective use of fault traveling wave information. Therefore, under the background of the integration of various communication technologies in the smart power distribution network, according to the "suit local conditions" principle, the appropriate communication technology is selected, and the traveling wave signal detection method and the power distribution network fault location method based on the traveling wave method are researched, which is beneficial to improve the disposal efficiency of the power distribution network line fault and promote the construction of strong and smart power distribution network in China. Therefore, there is a technical problem of low efficiency of power distribution network fault information detection. In view of the above technical problem of low efficiency of power distribution network fault information detection, at present, no effective solution has been proposed.

[0077] However, the embodiment of the present application proposes a fault traveling wave detection method based on an integrated capacitive coupler. After the fault occurs, the traveling wave signal detection device is synchronized by GPS / Beidou satellite; the fault traveling wave information detected by the integrated capacitive coupler is converted into a communication message through subsequent hardware circuit processing; the message containing the fault traveling wave amplitude and time information is transmitted to the background through the communication network; the current data resources are sorted in the background, and finally the fault branch determination and accurate fault point positioning are realized. The technical problem of low efficiency of power distribution network fault information detection is solved, and the technical effect of improving the efficiency of power distribution network fault information detection is realized.

[0078] The embodiment of the present application is further introduced as follows.

[0079] Figure 2 The flowchart of a fault traveling wave detection method based on an integrated capacitive coupler according to the embodiment of the present application is shown in the figure, and the analysis method comprises the following steps:

[0080] Step S201, install the traveling wave positioning device.

[0081] In this embodiment, considering that there are multiple main lines in the actual power distribution network, and there are numerous branches on each main line, in order to meet the double-end detection requirement, one traveling wave detection device can be configured at the head and tail of each main line of the active power distribution network.

[0082] Step S202, satellite synchronous time service.

[0083] In this embodiment, the fault traveling wave acquisition device is equipped with a power line carrier communication module, an optical fiber communication module and a wireless communication module at the same time, and the device has a differential amplification function for the collected fault voltage traveling wave. After the fault occurs, the traveling wave signal detection device is synchronized by the GPS / Beidou satellite.

[0084] Optionally, for different fault positions, fault types, transition resistances and noise interferences, the integrated capacitive coupler can realize reliable detection of the fault traveling wave, has strong anti-noise interference ability and sensitive response speed. In addition, compared with the traditional traveling wave detection device, the integrated capacitive coupler can realize traveling wave data transmission by using power line carrier communication, and has stronger adaptability in the power distribution network scene in remote areas.

[0085] Step S203, converting the fault traveling wave information into a communication message.

[0086] In this embodiment, the fault traveling wave information detected by the integrated capacitive coupler is converted into a communication message through subsequent hardware circuit processing.

[0087] Step S204, transmitting the communication message to the background.

[0088] In this embodiment, the message containing the fault traveling wave amplitude and time information is transmitted to the background through the communication network.

[0089] Step S205, the background integrates data, determines the position of the real fault point and outputs.

[0090] In this embodiment, the background organizes the current data resources, and finally realizes fault branch determination and accurate positioning of the fault point.

[0091] Figure 3 It is a structure schematic diagram of a fault traveling wave detection system based on an integrated capacitive coupler according to an embodiment of the application. The fault traveling wave detection system performs time service through a GPS / Beidou synchronous satellite, and transmits data to a background master station through a communication network.

[0092] In this embodiment, the coupling capacitor has a differential effect on the fault traveling wave signal while realizing high-frequency traveling wave signal transmission, as shown in the foregoing formula (1), which will not be repeated here.

[0093] Optionally, in order to explore the influence of the differential action on the initial traveling wave, a single exponential oscillation decay function is introduced to simulate the high-frequency initial traveling wave signal, as shown in the following formula (2).

[0094]

[0095] Wherein, r1 is the fault initial traveling wave signal, A1 is the fault initial traveling wave signal amplitude, f1 is the traveling wave signal frequency, t0 is the initial time of the traveling wave signal arrival, and τ is the time decay constant. After the differential transmission through the capacitor coupler, the following formula can be obtained.

[0096]

[0097] Optionally, the above formula is the expression of the initial traveling wave signal output after the transmission through the integrated capacitor coupler. By using the auxiliary angle formula of the trigonometric function, the following formula can be obtained.

[0098]

[0099] Optionally, from the above formula, the amplitude part Wherein, τ is much smaller than 1, and f1 is the frequency of the high-frequency traveling wave signal, which is much larger than 1. Therefore, after the differential transmission through the coupling capacitor, the fault traveling wave amplitude will be amplified times, and the higher the frequency, the higher the amplification degree. At the same time, the frequency is related to the traveling wave speed, and the higher the frequency, the faster the traveling wave speed, and the time of arrival at the detection end is also relatively shorter. Therefore, compared with the subsequent wave head, the differential amplification effect for the fault initial traveling wave head is more obvious than that for the subsequent wave head. Figure 4 is a schematic diagram of the comparison between the initial traveling wave and the initial traveling wave after the differential amplification, as shown in Figure 4 The amplified initial traveling wave fluctuates obviously.

[0100] Optionally, compared with the fault voltage traveling wave signal, the differential amplified voltage traveling wave signal changes more rapidly at the mutation point, which can effectively improve the steepness of the traveling wave head and enhance the anti-interference ability of the traveling wave signal, and is more suitable for the power distribution network fault traveling wave detection with serious noise interference and low traveling wave amplitude.

[0101] Optionally, Figure 5 is a schematic diagram of the power distribution network terminal carrier wave communication, as shown in Figure 5 When the optical fiber communication and wireless communication fail, the fault traveling wave information detected in the power distribution network is used for carrier wave communication through the power line, realizing the integrated design of the power distribution network fault traveling wave detection and traveling wave data communication.

[0102] Optionally, as Figure 5As shown, the fault traveling wave acquisition device is equipped with a power line carrier communication module, an optical fiber communication module and a wireless communication module simultaneously, and when the optical fiber communication and the wireless communication fail, the power line transmission can be used to transmit the fault traveling wave information to the signal coverage area, and then the information is uploaded to the background traveling wave fault location server in the mode of wireless communication or optical fiber communication, so as to realize the fusion mode of the power line carrier communication and the wireless communication and the optical fiber communication. Meanwhile, for the poor power line channel environment in remote areas, a carrier communication method using the alternating current power frequency zero-crossing point is proposed.

[0103] Optionally, the frequency of the alternating current is 50Hz, the period is 0.02s, there are two zero-crossing points in one power frequency period, that is, the zero-crossing point, and the voltage of each harmonic is also zero at the zero-crossing point. Therefore, communication at the zero-crossing point can effectively reduce the noise interference in the channel. FIG. 6 is a schematic diagram of a power frequency zero-crossing point carrier communication encoding mode according to an embodiment of the present application, as shown in FIG. 6, modulation uses two adjacent period waveforms to represent one bit of information, FIG. 6(a) is the first power frequency cycle voltage from positive to negative zero-crossing point, the carrier machine sends a sinusoidal carrier signal through an integrated capacitor coupler to the power line for modulation, the second power frequency cycle does not perform carrier modulation, indicating information "1", and vice versa, indicating information "0". Among them, FIG. 6(a) represents information "1", and FIG. 6(b) represents information "0".

[0104] Optionally, the signal is received once every two cycles, and the difference between the two power frequency cycles is used to basically eliminate the influence of the fundamental wave and the harmonic wave, and only the detection of whether the modulated carrier signal exists in the received signal can realize demodulation. Since the sinusoidal carrier signal sent by the carrier machine during modulation is known, a sinusoidal carrier signal with the same frequency and phase as the modulated carrier signal is used for matching operation during signal reception, as shown in the following formula (5).

[0105]

[0106] Among them, Figure 7 is a schematic diagram of a sinusoidal carrier template matching according to an embodiment of the present application, as shown in FIG. 7, N represents the amplitude vector of the received signal (the amplitude after the difference between the front and rear power frequency cycles, which is composed of the amplitude of each sampling point), k is the number of sampling points. M is the amplitude vector of the sinusoidal carrier template with the same frequency and phase. Figure 7 Optionally,

[0107] The greater the value is, the higher the matching degree of the modulated signal and the sinusoidal carrier template is. At the same time, it can be known from the encoding mode that the received waveforms of the information bits "1" and "0" are opposite, and therefore the matching results of the two with the sinusoidal carrier template are also opposite. Therefore, only the positive and negative of the value can be used to realize the discrimination of the information bits, and the discrimination formula is shown in the following formula (6). ​​

[0108]

[0109] Optionally, the specific process of transmitting fault traveling wave data by using the AC power frequency zero-crossing point carrier communication method is as follows: the fault traveling wave information detected by the integrated capacitive coupler is converted into a communication message through subsequent hardware circuit processing; at the moment when the AC voltage amplitude is zero, the sinusoidal carrier signal is coupled to the power line through the integrated capacitive coupler for modulation and coding; the adjacent cycles are subtracted to demodulate, the same frequency and same phase sinusoidal carrier signal is injected, the aforementioned formula (5) is used for matching operation to detect whether there is a modulation signal, and the information bits are identified according to the aforementioned formula (6).

[0110] Optionally, Figure 8 is a signal noise differentiation contrast diagram of an embodiment of the application, as Figure 8 shown, 50 groups of noise signals and actual modulation signals are randomly collected, the difference value of the continuous two power frequency cycles is used for demodulation, and the same frequency and same phase sinusoidal carrier signal is input for template matching to detect the modulation signal.

[0111] Optionally, it can be known from Figure 8 that the sinusoidal carrier template matching method can effectively identify the modulation signal, has obvious signal and noise differentiation advantage, is suitable for the power distribution network scene with poor power line channel environment, realizes effective transmission of the traveling wave data, and improves the overall communication efficiency of the power distribution network.

[0112] Optionally, Table 1 is a neutral point non-grounding system different transition resistance fault traveling wave detection test result table, Table 2 is a neutral point through arc suppression coil grounding system different transition resistance fault traveling wave detection test result table, Table 3 is a neutral point non-grounding system different fault type traveling wave detection test table, and Table 4 is a neutral point through arc suppression coil grounding system different fault type traveling wave detection test table. It can be known from Tables 1 to 4 that under different fault conditions, the integrated capacitive coupler is used for detecting the fault traveling wave, and effective traveling wave signals can be detected, and the traveling wave signal amplitude is much larger than the noise signal, which can effectively avoid the interference of the noise signal on the traveling wave signal.

[0113] Table 1 Neutral point non-grounding system different transition resistance fault traveling wave detection test

[0114]

[0115] Table 2 Neutral point through arc suppression coil grounding system different transition resistance fault traveling wave detection test

[0116]

[0117] Table 3 Neutral point non-grounding system different fault type traveling wave detection test

[0118]

[0119] Table 4 Different fault types of the neutral point arc suppression coil grounding system

[0120]

[0121] Optionally, after multiple reflections, the real waveform of the fault traveling wave in the distribution network line is superimposed by multiple continuous and alternating positive and negative polarity wave heads. Therefore, in order to directly verify the transmission of the integrated capacitor coupler to the fault traveling wave, the present application uses a 10kV real distribution network test field to test the transmission of the real fault traveling wave.

[0122] Optionally, Figure 9 is a schematic diagram of a 10kV real distribution network test field line topology structure of an embodiment of the present application, as Figure 9 shown, fault points A, C, D are respectively set at a distance of 1km from the bus on the long cable 1 line, at a distance of 2.2km from the bus on the long overhead 3 line, and at a distance of 1km from the bus on the long cable 2 line.

[0123] Optionally, an integrated capacitor coupler is installed at the fault phase at the end of each line to verify the detection capability of the real fault traveling wave, and a traveling wave sensor based on a Rogowski coil is installed on the grounding line of the distribution box for comparison test.

[0124] Optionally, Figure 10 is a schematic diagram of a sensor waveform detection comparison result of an embodiment of the present application, as can be seen from Figure 10(a), the traditional Rogowski coil traveling wave sensor and the integrated capacitor coupler can accurately detect the fault traveling wave waveform when a metallic single-phase grounding fault occurs, and can accurately label the wave head reflecting the mutation point of the fault traveling wave. However, due to the capacitive differentiation of the integrated capacitor coupler, the wave head has a faster falling speed, a more severe wave head steepness, and a larger amplitude compared to the Rogowski coil, and is more easily labeled in strong noise interference. As can be seen from Figure 10(b), when the fault point has a large transition resistance, resulting in a decrease in the initial fault traveling wave amplitude, the integrated capacitor coupler still has good traveling wave transmission characteristics, while the Rogowski coil has a weak output amplitude, which easily causes the wave head to be lost in the noise. In this scenario, the integrated capacitor coupler is more suitable for detecting fault traveling wave information.

[0125] Optionally, the integrated capacitor coupler can reliably detect the fault traveling wave for different fault locations, fault types, transition resistances, and noise interference, and has strong anti-noise interference ability and sensitive response speed. In addition, compared with the traditional traveling wave detection device, the integrated capacitor coupler can use power line carrier communication to realize traveling wave data transmission, and has stronger adaptability in remote distribution network scenarios.

[0126] In the embodiment, the traveling wave signal detection device is synchronized by GPS / Beidou satellite; the fault traveling wave information detected by the integrated capacitive coupler is converted into a communication message through subsequent hardware circuit processing; the message containing the fault traveling wave amplitude and time information is transmitted to the background through the communication network; the current data resources are sorted in the background, and finally the fault branch determination and accurate positioning of the fault point are realized. The technical problem of low efficiency of power distribution network fault information detection is solved, and the technical effect of improving the efficiency of power distribution network fault information detection is realized.

[0127] According to the embodiment of the application, a determination device for fault information of a power distribution network is also provided. It should be noted that the determination device for fault information of the power distribution network can be used to execute the determination method for fault information of the power distribution network in the method embodiment.

[0128] Figure 11 is a schematic diagram of a determination device for fault information of a power distribution network according to the embodiment of the application. As shown in Figure 11 , the determination device 1100 for fault information of the power distribution network can include an acquisition unit 1101, a conversion unit 1102, an extraction unit 1103 and a determination unit 1104.

[0129] The acquisition unit 1101 is configured to acquire a fault traveling wave signal of the power distribution network in response to a fault of the power distribution network.

[0130] The conversion unit 1102 is configured to convert the fault traveling wave signal into a communication message.

[0131] The extraction unit 1103 is configured to extract time intensity information from the communication message, wherein the time intensity information is used to indicate a time when the fault traveling wave signal reaches a bus detection point of the power distribution network, a time length of the fault traveling wave propagation and a signal intensity of the fault traveling wave signal.

[0132] The determination unit 1104 is configured to determine fault information of the fault based on the time intensity information.

[0133] Optionally, the acquisition unit 1101 can include a first acquisition module configured to acquire an adjustment parameter in response to a fault of the power distribution network, wherein the adjustment parameter is used to indicate a numerical value for adjusting the collection device; an adjustment module configured to adjust the collection device based on the adjustment parameter; and a second acquisition module configured to acquire the fault traveling wave signal based on the adjusted collection device.

[0134] Optionally, the extracting unit 1103 can comprise an extracting module configured to extract fault traveling wave amplitude information and time information from the communication message, wherein the fault traveling wave amplitude information is used to indicate signal strength of the fault traveling wave signal, and the time information is used to indicate time when the fault traveling wave reaches the bus detection point of the power distribution network and / or time length of fault traveling wave propagation; and an integrating module configured to integrate the fault traveling wave amplitude information and the time information to obtain time strength information.

[0135] Optionally, the fault information determination apparatus 1100 of the power distribution network can further comprise an enhancing unit configured to perform enhancing processing on the time strength information to obtain enhanced time strength information.

[0136] Optionally, the fault information determination apparatus 1100 of the power distribution network can further comprise a first obtaining unit configured to obtain a transmission strategy of the communication message; a second obtaining unit configured to obtain a transmission result in response to the transmission strategy being a first transmission strategy, wherein the first transmission strategy is used to indicate optical fiber and / or wireless transmission; and a first determination unit configured to determine a target transmission strategy of the communication message based on the transmission result, wherein the target transmission strategy is used to indicate a rule of transmitting the communication message.

[0137] Optionally, the first determination unit can comprise a first determination module configured to determine the target transmission strategy as the first transmission strategy in response to the transmission result being transmission success; and a second determination module configured to determine the target transmission strategy as a second transmission strategy in response to the transmission result being transmission failure, wherein the second transmission strategy is used to indicate power line transmission.

[0138] In this embodiment, in response to a fault occurring in the power distribution network, a fault traveling wave signal of the power distribution network is obtained; the fault traveling wave signal is converted into a communication message; time strength information is extracted from the communication message, wherein the time strength information is used to indicate time when the fault traveling wave signal reaches a bus detection point of the power distribution network, time length of fault traveling wave propagation and signal strength of the fault traveling wave signal; and fault information of the fault is determined based on the time strength information. That is, the embodiment of the present application determines time strength information of the fault traveling wave signal by processing the fault traveling wave signal of the power distribution network, and determines fault information of the fault according to the time strength information, thereby solving the technical problem of low detection efficiency of fault information of the power distribution network and achieving the technical effect of improving the detection efficiency of fault information of the power distribution network.

[0139] According to the embodiment of the present application, a computer readable storage medium is further provided, which comprises a stored program, wherein the program performs the fault information determination method of the power distribution network in the method embodiment.

[0140] According to the embodiment of the present application, a processor for running a program is further provided, wherein the program implements the method for determining the fault information of the power distribution network when running.

[0141] According to the embodiment of the present application, a computer program product including computer instructions is further provided, wherein the computer instructions implement the method for determining the fault information of the power distribution network when executed by a processor.

[0142] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

[0143] In the above-mentioned embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0144] In several embodiments provided in the present application, it should be understood that the disclosed technical contents can be implemented by other manners. Among them, the above-mentioned device embodiments are only schematic, for example, the division of units can be a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or modules shown or discussed can be indirect coupling or communication connection through some interfaces, and can be electrical or other forms.

[0145] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed to multiple units. According to actual needs, part or all of the units can be selected to achieve the purpose of the present embodiment.

[0146] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0147] If the integrated unit is implemented in the form of a software function unit and sold or used as an independent function component, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software function component, which is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the various embodiment methods of the present application. The aforementioned storage medium includes various media that can store program codes, such as a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0148] The above is only the preferred embodiment of the present application, and it should be pointed out 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, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A method of determining fault information of a power distribution network, characterized by, The method comprises the following steps: In response to a fault occurring in a power distribution network, a fault traveling wave signal of the power distribution network is acquired, and the amplitude of the fault traveling wave signal is amplified through a differential conversion of an integrated capacitive coupler; The fault traveling wave signal detected by the integrated capacitive coupler is converted into a communication message through subsequent hardware circuit processing by using an alternating current power frequency zero-crossing point carrier communication method; at the moment when the amplitude of the alternating current voltage is zero, a sinusoidal carrier signal is coupled to the power line through the integrated capacitive coupler for modulation and coding; the modulation is demodulated by making a difference between the adjacent cycles, a same-frequency and same-phase sinusoidal carrier is injected, and the following formula is used for matching operation to detect whether there is a modulation signal: ； wherein M is used to represent the amplitude vector of the same frequency and same phase sinusoidal carrier template, N is used to represent the amplitude vector of the received signal, k is used to represent the number of sampling points, for representing the modulated signal; And the following formula is used for information bit recognition: ； Wherein, information bit 1 is used to indicate that when the first power frequency cycle voltage passes through the zero-crossing point from positive to negative, the carrier machine sends the sinusoidal carrier signal to the power line through the integrated capacitive coupler for modulation, and the second power frequency cycle does not carry out carrier modulation; otherwise, it is information bit 0; Time intensity information is extracted from the communication message, wherein the time intensity information is used to indicate the time when the fault traveling wave signal reaches the bus detection point of the power distribution network, the time length of the fault traveling wave propagation and the signal intensity of the fault traveling wave signal; Based on the time intensity information, the fault information of the fault is determined.

2. The method of claim 1, wherein, In response to a fault occurring in a power distribution network, a fault traveling wave signal of the power distribution network is acquired, and the amplitude of the fault traveling wave signal is amplified through a differential conversion of an integrated capacitive coupler; In response to the fault occurring in the power distribution network, an adjustment parameter is acquired, wherein the adjustment parameter is used to indicate the numerical value of adjusting the acquisition device; Based on the adjustment parameter, the acquisition device is adjusted; Based on the adjusted acquisition device, the fault traveling wave signal is acquired.

3. The method of claim 1, wherein, The time intensity information is extracted from the communication message, comprising: Fault traveling wave amplitude information and time information are extracted from the communication message, wherein the fault traveling wave amplitude information is used to indicate the signal intensity of the fault traveling wave signal, and the time information is used to indicate the time when the fault traveling wave reaches the bus detection point of the power distribution network and / or the time length of the fault traveling wave propagation; The fault traveling wave amplitude information and the time information are integrated to obtain the time intensity information.

4. The method of claim 1, wherein, Before determining the fault information of the fault based on the time intensity information, the method further comprises: The time intensity information is enhanced to obtain enhanced time intensity information.

5. The method of claim 1, wherein, The method further comprises: A transmission strategy of the communication message is acquired; In response to the transmission strategy being a first transmission strategy, a transmission result is acquired, wherein the first transmission strategy is used to indicate optical fiber and / or wireless transmission; Based on the transmission result, a target transmission strategy of the communication message is determined, wherein the target transmission strategy is used to indicate the rule of transmitting the communication message.

6. The method of claim 5, wherein, Based on the transmission result, the target transmission strategy of the communication message is determined, comprising: In response to the transmission result being transmission success, it is determined that the target transmission strategy is the first transmission strategy; In response to the transmission result being a transmission failure, the target transmission strategy is determined as a second transmission strategy, where the second transmission strategy is used to indicate power line transmission.

7. An apparatus for determining fault information of a power distribution network, characterized by The method comprises the following steps: An acquisition unit is configured to, in response to a fault occurring in a power distribution network, acquire a fault traveling wave signal of the power distribution network, and amplify an amplitude of the fault traveling wave signal through differential conversion of an integrated capacitor coupler. A conversion unit is configured to transmit the fault traveling wave signal using an alternating current power frequency zero-crossing point carrier communication method, convert the fault traveling wave signal detected by the integrated capacitor coupler into a communication message through subsequent hardware circuit processing, couple a sinusoidal carrier signal to a power line through the integrated capacitor coupler for modulation and coding at a moment when an alternating current voltage amplitude is zero, demodulate a difference between adjacent cycles, inject a same-frequency and same-phase sinusoidal carrier, and perform matching operation using the following formula to detect whether a modulation signal exists: ； wherein M is used to represent the amplitude vector of the same frequency and same phase sinusoidal carrier template, N is used to represent the amplitude vector of the received signal, k is used to represent the number of sampling points, for representing the modulated signal; And use the following formula to identify information bits: ； Wherein, information bit 1 is used to indicate that when the first power frequency cycle voltage passes through a positive to negative zero-crossing point, the carrier machine sends the sinusoidal carrier signal to the power line through the integrated capacitor coupler for modulation, and the second power frequency cycle does not perform carrier modulation; otherwise, it is information bit 0. An extraction unit is configured to extract time intensity information from the communication message, where the time intensity information is used to indicate a moment when the fault traveling wave signal reaches a bus detection point of the power distribution network, a time length of the fault traveling wave propagation, and a signal intensity of the fault traveling wave signal. A determination unit is configured to determine fault information of the fault based on the time intensity information.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a stored program, wherein the program controls the device where the storage medium is located to execute the method of any one of claims 1 to 6 when the program is run by the processor.

9. A processor, comprising: The processor is configured to run a program, wherein the program executes the method of any one of claims 1 to 6 when the program is run.

10. A computer program product, characterised in that, The computer program product comprises computer instructions that, when executed by a processor, implement the method of any one of claims 1 to 6.

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