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

Abstract

The invention discloses a method and device for determining fault information of a power distribution network and a readable storage medium. The method comprises the following steps: in response to a fault of 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; time intensity information is extracted from the communication message, and the time intensity information is used for indicating the moment when the fault traveling wave signal reaches a bus detection point of the power distribution network, the propagation duration of the fault traveling wave and the signal intensity of the fault traveling wave signal; and determining fault information of the fault based on the time intensity information. The technical problem of low fault information detection efficiency of the power distribution network is solved.

Description

Technical Field

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

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

[0003] In the related technologies, due to the characteristics of weak amplitude, fast attenuation and short duration of the fault traveling wave of the distribution network, the traditional fault traveling wave detection device still has problems such as weak output traveling wave signal amplitude and insufficient transmission accuracy. At the same time, since a single communication method is difficult to cover the entire distribution network, the distribution network fault traveling wave detection terminal has a communication blind spot when transmitting data, which hinders the transmission of fault traveling wave information, further affecting the effective use of fault traveling wave information. Therefore, in the context of the integration of multiple communication technologies in the smart distribution network, selecting appropriate communication technology based on the principle of "adapting measures to local conditions" and conducting research on traveling wave signal detection methods and distribution network fault location methods based on traveling wave method will help improve the efficiency of handling distribution network line faults and promote the construction of a strong and intelligent distribution network in my country. Therefore, there is a technical problem of low efficiency in detecting distribution network fault information.

[0004] With respect to the above-mentioned technical problem of low efficiency in fault information detection in distribution networks, no effective solution has been proposed so far. Summary of the invention

[0005] The embodiments of the present invention provide a method, a device and a readable storage medium for determining fault information of a distribution network, so as to at least solve the technical problem of low efficiency in detecting fault information of the distribution network.

[0006] According to one aspect of an embodiment of the present invention, a method for determining fault information of a distribution network is provided. The method may include: in response to a fault in the distribution network, obtaining a fault traveling wave signal of the 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 the time when the fault traveling wave signal reaches the bus detection point of the distribution network, the duration of the fault traveling wave propagation, and the signal intensity of the fault traveling wave signal; and determining the fault information of the fault based on the time intensity information.

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

[0008] Optionally, extracting 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 strength of the fault traveling wave signal, and the time information is used to indicate the moment when the fault traveling wave reaches the bus detection point of the distribution network and / or the duration of the fault traveling wave propagation; integrating the fault traveling wave amplitude information and the time information to obtain the time intensity information.

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

[0010] Optionally, the method for determining fault information of a distribution network further includes: obtaining a transmission strategy for a 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; based on the transmission result, determining a target transmission strategy for the communication message, wherein the target transmission strategy is used to indicate rules for transmitting the communication message.

[0011] Optionally, based on the transmission result, the target transmission strategy of the communication message is determined, including: in response to the transmission result being a successful transmission, determining the target transmission strategy to be a first transmission strategy; in response to the transmission result being a failed transmission, determining the target transmission strategy to be a second transmission strategy, wherein the second transmission strategy is used to indicate power line transmission.

[0012] According to another aspect of an embodiment of the present invention, a device for determining fault information of a distribution network is also provided. The device may include: an acquisition unit, for acquiring a fault traveling wave signal of the distribution network in response to a fault in the distribution network; a conversion unit, for converting the fault traveling wave signal into a communication message; an extraction unit, for extracting 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 distribution network, the duration of the fault traveling wave propagation, and the signal intensity of the fault traveling wave signal; and a determination unit, for determining the fault information of the fault based on the time intensity information.

[0013] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method for determining fault information of the distribution network in an embodiment of the present invention.

[0014] According to another aspect of an embodiment of the present invention, a processor is further provided. The processor is used to run a program, wherein when the program is run, the method for determining fault information of a power distribution network in an embodiment of the present invention is executed.

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

[0016] In an embodiment of the present invention, in response to a fault in the distribution network, a fault traveling wave signal of the 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 the moment when the fault traveling wave signal reaches the bus detection point of the distribution network, the duration 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. That is to say, the embodiment of the present invention determines the time intensity information of the fault traveling wave signal by processing the fault traveling wave signal of the distribution network, thereby determining the fault information of the fault according to the time intensity information, thereby solving the technical problem of low efficiency in detecting fault information of the distribution network and achieving the technical effect of improving the efficiency in detecting fault information of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a flow chart of a method for determining fault information of a distribution network according to an embodiment of the present invention;

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

[0020] Figure 3 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 invention;

[0021] Figure 4 is a schematic diagram of a comparison between an initial traveling wave and an initial traveling wave after differential amplification in an embodiment of the present invention;

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

[0023] 6 is a schematic diagram of an industrial frequency zero-crossing carrier communication coding method according to an embodiment of the present invention;

[0024] Figure 7 is a schematic diagram of sinusoidal carrier template matching according to an embodiment of the present invention;

[0025] Figure 8 is a schematic diagram of signal-noise distinction and comparison according to an embodiment of the present invention;

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

[0027] FIG10 is a schematic diagram of a sensor waveform detection comparison result according to an embodiment of the present invention;

[0028] Fig.11 is a schematic diagram of a device for determining fault information of a distribution network according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, functional component or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, functional components or devices.

[0031] According to an embodiment of the present invention, an embodiment of a method for determining fault information of a distribution network is provided. It should be noted that the steps shown in the flowchart of the accompanying 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 flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0032] Figure 1 is a flow chart of a method for determining fault information of a distribution network according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0033] Step S101: in response to a fault in a distribution network, a fault traveling wave signal of the distribution network is acquired.

[0034] In the technical solution provided in the above step S101 of the present invention, the fault traveling wave signal may also be referred to as fault traveling wave information.

[0035] In this embodiment, when a fault occurs in the distribution network, a fault traveling wave signal of the distribution network is obtained. For example, the fault traveling wave signal of the distribution network is obtained through an integrated capacitive coupler. This is only an example and does not limit the specific method of obtaining the fault traveling wave signal of the distribution network.

[0036] For example, a traveling wave detection device is configured at the head and end of each main line of the active 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. At the same time, 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 with the GPS / Beidou satellite and the fault traveling wave signal of the distribution network is collected.

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

[0038] In the technical solution provided in the above step S102 of the present invention, after the fault traveling wave signal of the distribution network is acquired in 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 through a hardware circuit, wherein 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] Step S103, extracting time intensity information from the communication message.

[0042] In the technical solution provided in the above step S103 of the present invention, the time intensity information is used to indicate the time when the fault traveling wave signal reaches the bus detection point of the distribution network, the duration 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 step S102, time intensity information is extracted from the communication message, wherein the time intensity information may at least include: 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 relevant information of the fault traveling wave signal is parsed, including the fault traveling wave amplitude and time information. Extract the fault traveling wave amplitude: find the corresponding field or data in the communication message, and parse the amplitude of the fault traveling wave signal. The fault traveling wave amplitude usually indicates the strength of the signal. Extract time information: find the corresponding time field or data in the communication message, and parse the time information of the fault traveling wave signal. The time information may include the generation time and propagation time of the signal.

[0045] Step S104: determining fault information of the fault based on the time intensity information.

[0046] In the technical solution provided in the above step S104 of the present invention, the fault information may at least include: fault location, fault type, transition resistance, noise interference, etc.

[0047] In this embodiment, after extracting the time intensity information from the communication message in 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 achieve fault branch determination and accurate positioning of the fault point.

[0048] For example, an integrated capacitor coupler can be used to achieve reliable detection of fault traveling waves. The integrated capacitor coupler can use power line carrier communication to realize traveling wave data transmission, and has stronger adaptability in distribution network scenarios in remote areas.

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

[0050] In the above steps S101 to S104 of the present invention, in response to a fault in the distribution network, a fault traveling wave signal of the 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 the moment when the fault traveling wave signal reaches the bus detection point of the distribution network, the duration 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. That is to say, the embodiment of the present invention determines the time intensity information of the fault traveling wave signal by processing the fault traveling wave signal of the distribution network, thereby determining the fault information of the fault according to the time intensity information, thereby solving the technical problem of low efficiency in detecting fault information of the distribution network and achieving the technical effect of improving the efficiency in detecting fault information of the distribution network.

[0051] The above method of this embodiment is further introduced below.

[0052] As an optional implementation method, in response to a fault in the distribution network, obtaining a fault traveling wave signal of the distribution network includes: in response to a fault in the distribution network, obtaining an adjustment parameter, wherein the adjustment parameter is used to indicate a numerical value for adjusting a collection device; adjusting the collection device based on the adjustment parameter; and obtaining a fault traveling wave signal based on the adjusted collection device.

[0053] In this embodiment, when a fault occurs in the distribution network, it is necessary to locate the fault, based on which, an adjustment parameter is obtained. The adjustment parameter may be a coupling capacitor and a tuner capacitance value of the integrated capacitive coupler.

[0054] Optionally, after the adjustment parameters are obtained, the acquisition device is adjusted according to the adjustment parameters to obtain the fault traveling wave signal.

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

[0056]

[0057] Among them, C C is the equivalent capacitance value of the coupling capacitor and tuner of the integrated capacitive coupler; US is the voltage traveling wave signal in the primary side line, and i1 is the current flowing through the coupling capacitor. According to the determined coupling capacitor and tuner capacitance values, adjust the acquisition equipment.

[0058] As an optional implementation method, 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 strength of the fault traveling wave signal, and the time information is used to indicate the moment when the fault traveling wave reaches the bus detection point of the distribution network and / or the duration of the fault traveling wave propagation; 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 time information are extracted from the communication message. For example, the fault traveling wave amplitude information and time information are parsed according to the format and protocol of the communication message.

[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 formed by putting the fault wave amplitude information and time information together to form a data structure or table. The time intensity information may include the amplitude of the fault wave and the corresponding time point for subsequent analysis and processing. For example, the amplitude information and time information may be stored in a two-dimensional array, where each row represents a time point, including time information and amplitude information. In addition, the time information and amplitude information may also be stored in a dictionary or other data structure for easy indexing and searching by time point.

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

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

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

[0065] As an optional implementation method, the method for determining fault information of a distribution network also includes: obtaining a transmission strategy for a 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; based on the transmission result, determining a target transmission strategy for the communication message, wherein the target transmission strategy is used to indicate rules for transmitting the communication message.

[0066] In this embodiment, when the transmission strategy is the first transmission strategy, it means 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 the transmission result is obtained, 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 implementation method, based on the transmission result, the target transmission strategy of the communication message is determined, including: in response to the transmission result being a successful transmission, determining the target transmission strategy to be a first transmission strategy; in response to the transmission result being a failed transmission, determining the target transmission strategy to be a second transmission strategy, wherein the second transmission strategy is used to indicate power line transmission.

[0069] In this embodiment, when the transmission result is successful transmission, it means that the current transmission strategy can correctly transmit data. Based on this, the target transmission strategy is determined to be the first transmission strategy.

[0070] Optionally, when the transmission result is a transmission failure, it means that the current transmission strategy cannot correctly transmit data, based on which, the target transmission strategy is determined to be the second transmission strategy.

[0071] For example, when optical fiber communication and wireless communication fail, the power line can be used to transmit the 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 embodiment can be executed by a device for determining fault information of a power distribution network.

[0073] In this embodiment, in response to a fault in the distribution network, a fault traveling wave signal of the 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 the moment when the fault traveling wave signal reaches the bus detection point of the distribution network, the duration 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. That is to say, the embodiment of the present invention determines the time intensity information of the fault traveling wave signal by processing the fault traveling wave signal of the distribution network, thereby determining the fault information of the fault according to the time intensity information, thereby solving the technical problem of low efficiency in detecting fault information of the distribution network and achieving the technical effect of improving the efficiency in detecting fault information of the distribution network.

[0074] The technical solution of the embodiment of the present invention is illustrated below in conjunction with preferred implementation modes.

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

[0076] In the related technologies, due to the characteristics of weak amplitude, fast attenuation and short duration of the fault traveling wave of the distribution network, the traditional fault traveling wave detection device still has problems such as weak output traveling wave signal amplitude and insufficient transmission accuracy. At the same time, since a single communication method is difficult to cover the entire distribution network, the distribution network fault traveling wave detection terminal has a communication blind spot when transmitting data, which hinders the transmission of fault traveling wave information, further affecting the effective use of fault traveling wave information. Therefore, under the background of the integration of multiple communication technologies in the smart distribution network, according to the principle of "adapting measures to local conditions", the appropriate communication technology is selected, and the traveling wave signal detection method and the distribution network fault location method based on the traveling wave method are studied, which is conducive to improving the handling efficiency of distribution network line faults and promoting the construction of a strong and intelligent distribution network in my country. Therefore, there is a technical problem of low efficiency in detecting distribution network fault information. At present, no effective solution has been proposed for the above-mentioned technical problem of low efficiency in detecting distribution network fault information.

[0077] However, the embodiment of the present invention proposes a fault traveling wave detection method based on an integrated capacitive coupler. After a fault occurs, the traveling wave signal detection device is synchronized and timed by GPS / Beidou satellites; 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 background organizes the current data resources, and finally realizes the fault branch determination and the accurate positioning of the fault point. The technical problem of low efficiency of distribution network fault information detection is solved, and the technical effect of improving the efficiency of distribution network fault information detection is achieved.

[0078] The embodiments of the present invention are further described below.

[0079] Figure 2 is a flow chart of a fault traveling wave detection method based on an integrated capacitive coupler according to an embodiment of the present invention. The analysis method comprises the following steps:

[0080] Step S201, installing a traveling wave positioning device.

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

[0082] Step S202: satellite synchronization timing.

[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, 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 and timed by GPS / Beidou satellite.

[0084] Optionally, for different fault locations, fault types, transition resistances, and noise interference, the integrated capacitive coupler can achieve reliable detection of fault traveling waves, and has strong anti-noise interference capabilities and a sensitive response speed. In addition, compared with traditional traveling wave detection devices, the integrated capacitive coupler can use power line carrier communication to achieve traveling wave data transmission, and has stronger adaptability in distribution network scenarios 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, a message containing the amplitude and time information of the fault traveling wave is transmitted to the background through the communication network.

[0089] Step S205: The background performs data integration, determines the location of the actual fault point and outputs it.

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

[0091] Figure 3 The present invention is a schematic diagram of a fault traveling wave detection system based on an integrated capacitive coupler according to an embodiment of the present invention. The fault traveling wave detection system is timed by GPS / Beidou synchronous satellites 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 the transmission of the high-frequency traveling wave signal, as shown in the above formula (1), which will not be described in detail 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] Among them, r1 is the initial traveling wave signal of the fault, A1 is the amplitude of the initial traveling wave signal of the fault, f1 is the frequency of the traveling wave signal, t0 is the starting time of the arrival of the traveling wave signal, τ is the time attenuation constant, and the following formula can be obtained after differential transmission through the capacitive coupler.

[0096]

[0097] Optionally, the above formula is the expression of the initial traveling wave signal output after being transformed by the integrated capacitive coupler, which can be simplified using the trigonometric auxiliary angle formula to obtain:

[0098]

[0099] Optionally, from the above formula, the amplitude part In the equation, 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 coupling capacitor is differentiated, the amplitude of the fault traveling wave will be amplified. times, and the higher the frequency, the higher the degree of amplification. At the same time, the frequency is related to the speed of the traveling wave. The higher the frequency, the faster the traveling wave speed is, and the time it takes to reach the detection end is relatively shorter. Therefore, compared with the subsequent wave heads, the differential amplification effect is more obvious for the initial traveling wave head of the fault than for the subsequent wave heads. Figure 4 is a schematic diagram of a comparison between an initial traveling wave and an initial traveling wave after differential amplification in an embodiment of the present invention, such as Figure 4 As shown, the initial traveling wave after amplification obviously fluctuates greatly.

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

[0101] Optionally, Figure 5 Schematic diagram of carrier communication at the end of a distribution network according to an embodiment of the present invention. Figure 5 As shown, when optical fiber communication and wireless communication fail, the fault traveling wave information detected in the distribution network is used for carrier communication via power lines, thereby realizing an integrated design of distribution network fault traveling wave detection and traveling wave data communication.

[0102] Alternatively, if 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. When the optical fiber communication and wireless communication fail, the fault traveling wave information can be transmitted to the signal coverage area by the power line, and then uploaded to the background traveling wave fault location server by wireless communication or optical fiber communication, realizing the integration of power line carrier communication, wireless communication and optical fiber communication. At the same time, in view of the harsh power line channel environment in remote areas, a method of using the zero-crossing point of the AC power frequency for carrier communication is proposed.

[0103] Optionally, the frequency of the alternating current is 50Hz, and the period is 0.02s. There are two zero-crossing moments, i.e., zero-crossing points, within one power frequency cycle, and the voltage of each harmonic is also zero at the zero-crossing point. Therefore, communication is performed at the zero-crossing point moment, which can effectively reduce noise interference in the channel. FIG6 is a schematic diagram of a power frequency zero-crossing carrier communication coding method of an embodiment of the present invention. As shown in FIG6, modulation uses two adjacent periodic waveforms to represent one bit of information. FIG6 (a) is when the first power frequency cycle voltage crosses zero from positive to negative, the carrier sends a sinusoidal carrier signal coupled to the power line through an integrated capacitive coupler for modulation, and the second power frequency cycle does not perform carrier modulation, which is represented as information "1", otherwise it is represented as information "0". Among them, FIG6 (a) represents information "1", and FIG6 (b) represents information "0".

[0104] Optionally, two cycles are sent once, and two consecutive power frequency cycles are used as the difference when the signal is received, which basically eliminates the influence of the fundamental wave and harmonics. Demodulation can be achieved by only detecting whether there is a modulated carrier signal in the receiving end signal. 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 when the signal is received, as shown in the following formula (5).

[0105]

[0106] in, Figure 7 is a schematic diagram of a sinusoidal carrier template matching according to an embodiment of the present invention, such as Figure 7 As shown, N represents the amplitude vector of the received signal (the amplitude after the difference between the previous and next power frequency cycles, the amplitude vector composed of the amplitude of each sampling point), k is the number of sampling points, and M is the amplitude vector of the same frequency and phase sinusoidal carrier template.

[0107] Optionally, The larger the value, the higher the matching degree between the modulated signal and the sinusoidal carrier template. At the same time, it can be seen from the encoding method that the received waveforms of the information bits "1" and "0" are opposite, so the matching results of the two with the sinusoidal carrier template are also opposite. Therefore, only according to The positive or negative value can be used to distinguish the information bit, and the discriminant is shown in the following formula (6).

[0108]

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

[0110] Optionally, Figure 8 is a schematic diagram of signal-noise distinction and comparison in an embodiment of the present invention, such as Figure 8 As shown, 50 groups of noise signals and actual modulation signals are randomly collected, two consecutive power frequency cycles are used as the difference for demodulation, and the same frequency and phase sinusoidal carrier signal is input to perform template matching to detect the modulation signal.

[0111] Optionally, by Figure 8 It can be seen that the sinusoidal carrier template matching method can effectively identify the modulated signal and has the obvious advantage of being able to separate the signal from the noise. It is suitable for distribution network scenarios with harsh power line channel environments, can realize the effective transmission of traveling wave data, and improve the overall communication efficiency of the distribution network.

[0112] Optionally, Table 1 is a table of traveling wave detection test results for different transition resistance faults in a neutral point ungrounded system, Table 2 is a table of traveling wave detection test results for different transition resistance faults in a neutral point grounded system via an arc suppression coil, Table 3 is a table of traveling wave detection tests for different fault types in a neutral point ungrounded system, and Table 4 is a table of traveling wave detection tests for different fault types in a neutral point grounded system via an arc suppression coil. It can be seen from Tables 1 to 4 that under different fault conditions, the integrated capacitive coupler is used to detect the fault traveling wave, and effective traveling wave signals can be detected, and the amplitudes of the traveling wave signals are much larger than the noise signals, which can effectively avoid the interference of noise signals on the traveling wave signals.

[0113] Table 1 Traveling wave detection test of different transition resistance faults in neutral point ungrounded system

[0114]

[0115] Table 2 Fault traveling wave detection test of different transition resistances in neutral point grounding system through arc suppression coil

[0116]

[0117] Table 3 Traveling wave detection test for different fault types in neutral point ungrounded system

[0118]

[0119] Table 4 Traveling wave detection test for different fault types in neutral point grounding system via arc suppression coil

[0120]

[0121] Optionally, after the transmission of the fault traveling wave in the distribution network line undergoes multiple refractions and reflections, its real waveform is composed of multiple continuous wave heads with alternating positive and negative polarities. Therefore, in order to directly verify the transmission and transformation of the fault traveling wave by the integrated capacitive coupler, the present invention uses a 10kV real distribution network test field to conduct a transmission and transformation test of a real fault traveling wave.

[0122] Optionally, Fig. 9 Schematic diagram of a line topology structure of a 10kV real distribution network test field according to an embodiment of the present invention. Fig. 9 As shown, fault points A, C, and D are set at a distance of 1 km from the busbar to the long cable line 1, 2.2 km from the busbar to the long overhead line 3, and 1 km from the busbar to the long cable line 2, respectively.

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

[0124] Optionally, FIG10 is a schematic diagram of a sensor waveform detection comparison result of an embodiment of the present invention. It can be seen from FIG10(a) that the traditional Rogowski coil traveling wave sensor and the integrated capacitor coupler can accurately detect the fault traveling wave waveform in the case of a metallic single-phase grounding fault, and reflect the mutation point of the fault traveling wave to accurately calibrate the wave head. However, due to the capacitance differential effect of the integrated capacitor coupler, its wave head drops faster than that of the Rogowski coil, the wave head is more steep, and the amplitude is larger, making it easier to calibrate the wave head under strong noise interference. It can be seen from FIG10(b) that when the transition resistance at the fault point is large, resulting in a decrease in the amplitude of the initial traveling wave of the fault, the integrated capacitor coupler still maintains a good traveling wave transmission characteristic, while the Rogowski coil, due to its weak output amplitude, can easily cause the wave head to be buried in the noise. In this scenario, the integrated capacitor coupler is more suitable for the detection of fault traveling wave information.

[0125] Optionally, the integrated capacitive coupler of the present invention can realize reliable detection of fault traveling waves for different fault locations, fault types, transition resistances, and noise interferences, and has strong anti-noise interference capability and sensitive response speed. In addition, compared with traditional traveling wave detection devices, the integrated capacitive coupler can realize traveling wave data transmission using power line carrier communication, and has stronger adaptability in distribution network scenarios in remote areas.

[0126] In this embodiment, the traveling wave signal detection device is synchronized and timed 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 background organizes the current data resources, and finally realizes the fault branch determination and the accurate positioning of the fault point. The technical problem of low efficiency of distribution network fault information detection is solved, and the technical effect of improving the efficiency of distribution network fault information detection is achieved.

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

[0128] Fig.11 is a schematic diagram of a device for determining fault information of a distribution network according to an embodiment of the present invention. Fig.11 As shown, the device 1100 for determining fault information of the power distribution network may include: an acquisition unit 1101 , a conversion unit 1102 , an extraction unit 1103 and a determination unit 1104 .

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

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

[0131] The extraction unit 1103 is used to 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 distribution network, the duration of the fault traveling wave propagation and the signal strength of the fault traveling wave signal.

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

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

[0134] Optionally, the extraction unit 1103 may include: an extraction module, used 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 the signal strength of the fault traveling wave signal, and the time information is used to indicate the moment when the fault traveling wave arrives at the bus detection point of the distribution network and / or the duration of the fault traveling wave propagation; an integration module, used to integrate the fault traveling wave amplitude information and time information to obtain time intensity information.

[0135] Optionally, the device 1100 for determining fault information of a distribution network may further include: an enhancement unit, configured to perform enhancement processing on the time intensity information to obtain enhanced time intensity information.

[0136] Optionally, the device 1100 for determining fault information of the distribution network may further include: a first acquisition unit, used to acquire the transmission strategy of the communication message; a second acquisition unit, used to acquire the transmission result in response to the transmission strategy being the first transmission strategy, wherein the first transmission strategy is used to indicate optical fiber and / or wireless transmission; a first determination unit, used to determine the target transmission strategy of the communication message based on the transmission result, wherein the target transmission strategy is used to indicate the rules for transmitting the communication message.

[0137] Optionally, the first determination unit may include: a first determination module, used to determine that the target transmission strategy is a first transmission strategy in response to the transmission result being a successful transmission; a second determination module, used to determine that the target transmission strategy is a second transmission strategy in response to the transmission result being a failed transmission, wherein the second transmission strategy is used to indicate power line transmission.

[0138] In this embodiment, in response to a fault in the distribution network, a fault traveling wave signal of the 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 the moment when the fault traveling wave signal reaches the bus detection point of the distribution network, the duration 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. That is to say, the embodiment of the present invention determines the time intensity information of the fault traveling wave signal by processing the fault traveling wave signal of the distribution network, thereby determining the fault information of the fault according to the time intensity information, thereby solving the technical problem of low efficiency in detecting fault information of the distribution network and achieving the technical effect of improving the efficiency in detecting fault information of the distribution network.

[0139] According to an embodiment of the present invention, there is further provided a computer-readable storage medium, the storage medium comprising a stored program, wherein the program executes the method for determining fault information of a power distribution network in the method embodiment.

[0140] According to an embodiment of the present invention, a processor is further provided. The processor is used to run a program, wherein the method for determining fault information of a power distribution network in the method embodiment is executed when the program is run.

[0141] According to an embodiment of the present invention, a computer program product is further provided. The computer program product includes computer instructions. When the computer instructions are executed by a processor, the method for determining fault information of a power distribution network in the method embodiment is implemented.

[0142] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0143] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0144] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

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

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

[0147] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent functional component, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software functional component, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store program codes.

[0148] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining fault information of a distribution network, characterized in that: include: In response to a fault in the distribution network, obtaining a fault traveling wave signal of the 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 the time when the fault traveling wave signal reaches the bus detection point of the distribution network, the duration of the fault traveling wave propagation, and the signal intensity of the fault traveling wave signal; Based on the time intensity information, fault information of the fault is determined.

2. The method according to claim 1, characterized in that In response to a fault in a distribution network, obtaining a fault traveling wave signal of the distribution network includes: In response to a failure of the distribution network, an adjustment parameter is obtained, wherein the adjustment parameter is used to indicate a value for adjusting a collection device; Adjusting the acquisition device based on the adjustment parameters; Based on the adjusted acquisition device, the fault traveling wave signal is acquired.

3. The method according to claim 1, characterized in that Extracting time intensity information from the communication message includes: Extract 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 strength of the fault traveling wave signal, and the time information is used to indicate the moment when the fault traveling wave arrives at the bus detection point of the distribution network and / or the duration of the fault traveling wave propagation; integrate the fault traveling wave amplitude information and the time information to obtain the time intensity information.

4. The method according to claim 1, characterized in that: Before determining fault information of the fault based on the time intensity information, the method further includes: The time intensity information is enhanced to obtain enhanced time intensity information.

5. The method according to claim 1, characterized in that The method further comprises: Obtaining a transmission strategy for 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; Based on the transmission result, a target transmission strategy of the communication message is determined, wherein the target transmission strategy is used to indicate a rule for transmitting the communication message.

6. The method according to claim 5, characterized in that Determining a target transmission strategy for the communication message based on the transmission result includes: In response to the transmission result being a successful transmission, determining that the target transmission strategy is the first transmission strategy; In response to the transmission result being a transmission failure, determining the target transmission strategy to be a second transmission strategy, wherein the second transmission strategy is used to indicate power line transmission.

7. A device for determining fault information of a distribution network, characterized in that: include: An acquisition unit, configured to acquire a fault traveling wave signal of the distribution network in response to a fault occurring in the distribution network; A conversion unit, used for converting the fault traveling wave signal into a communication message; An extraction unit, used to 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 distribution network, the duration of the fault traveling wave propagation and the signal strength of the fault traveling wave signal; A determination unit is used 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 includes a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 6.

9. A processor, characterized in that: The processor is used to run a program, wherein the program executes the method according to any one of claims 1 to 6 when running.

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

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