CN116256600A - Fault detection method, device, equipment and storage medium for distribution network - Google Patents

Abstract

The invention discloses a fault detection method, device, equipment and storage medium of a power distribution network, wherein the method comprises the following steps: collecting electrical information of a target area in the power distribution network, wherein the target area is provided with a fault point where a fault occurs; under the condition that the fault points are supposed to be distributed on each branch of the target area, detecting a first position of the fault point in the target area according to the electrical information; detecting a second position of the fault point in the target area according to the voltage traveling wave transmitted by the fault point in the target area; checking the validity of the first position according to the second position; and if the first position is verified to be valid, determining that the fault point is at the first position in the target area. In the embodiment, the fault points are positioned from multiple dimensions, and the first positions of the supposed distributed positioning fault points are verified according to the second positions of the voltage traveling wave positioning fault points, so that the accuracy of fault point positioning can be improved.

Description

Fault detection method, device, equipment and storage medium for distribution network

technical field

The invention relates to the technical field of power grids, in particular to a fault detection method, device, equipment and storage medium for a distribution network.

Background technique

With the continuous improvement of residents' living standards and the rapid development of the economy, the development of urban power is becoming more and more rapid. The use of a large number of household appliances makes residents' electricity consumption more and more, and constantly creates new peak electricity consumption.

The distribution network is an important link to ensure the stable and reliable electricity consumption of residents. It is directly erected in the city. The complex operating environment and increasingly complex grid structure make its stable operation ability decline. Various types of faults often occur in the power system. In the distribution network, it has a great impact on the stable and reliable electricity consumption of residents.

In order to ensure the use of a large number of residential electrical equipment and meet the residents' demand for power quality, it is a link that directly affects the residential electricity consumption. At present, the faults of the distribution network are mainly located by methods such as waveform shape comparison and entropy method. These methods Single, resulting in low accuracy of fault location.

Contents of the invention

The invention provides a fault detection method, device, equipment and storage medium of a distribution network to solve the problem of how to improve the accuracy of locating faults in the distribution network.

According to an aspect of the present invention, a fault detection method for a distribution network is provided, including:

Collecting electrical information for a target area in the distribution network, where there is a fault point where a fault occurs;

Detecting the first position of the fault point in the target area according to the electrical information under the assumption that the fault point is distributed on each branch of the target area;

detecting a second position of the fault point in the target area according to the voltage traveling wave propagated by the fault point in the target area;

verifying the validity of the first location according to the second location;

If it is verified that the first position is valid, it is determined that the fault point is at the first position in the target area.

Optionally, the detecting the first position of the fault point in the target area according to the electrical information under the assumption that the fault point is distributed on each branch of the target area includes:

Query the branch types in the target area;

If the branch type is a single branch area, it is determined that the fault point is located on a single feeder in the target area, and the first position of the fault point on a single feeder is detected according to the electrical information. Location;

If the branch type is a multi-branch area, sequentially assume that the fault points are distributed on each feeder line of the target area, and detect the fault point according to the electrical information on the ports of each target area The first position on one of said feeders.

Optionally, assuming that the fault point is distributed on each feeder line of the target area in sequence, detecting the location of the fault point on a certain feeder line according to the electrical information on the port of the target area in the first position, including:

setting the fault point at a target line in the target area, where the target line is initially the first feeder in the target area;

using the electrical information on the ports of the target area to form a multi-terminal fault locating equation;

Solving the multi-terminal fault distance measurement equations to obtain a fault measurement value at which the fault point is located on the target line;

judging whether the fault measurement value is within a preset fault range;

If so, calculating the first position of the fault point on the target line according to the fault measure value;

If not, set the next feeder line located at the current target line as a new target line, and return to performing the determination that the fault point is set in the target line in the target area.

Optionally, the electrical information includes the phase angle of the voltage and the phase angle of the current at the fault point;

The electrical information on the ports of the target area is used to form a multi-terminal fault location equation group, including:

Query the length of the target line;

substituting the fault measurement value, the phase angle of the voltage, the phase angle of the current and the length of the target line into a preset mapping function;

The value output by the mapping function is set to 0, as a multi-terminal fault distance measurement equation group.

Optionally, the detecting the second position of the fault point in the target area according to the voltage traveling wave propagated by the fault point in the target area includes:

Determining the line where the fault point is located in the target area;

collecting traveling voltage waves propagating from the fault point to both ends of the line when a fault occurs at the fault point;

constructing a set of propagation equations according to the moment when the voltage traveling wave is received at both ends of the line;

Solving the set of propagation equations to obtain a second position of the fault point on the line.

Optionally, the set of propagation equations includes:

Wherein, M and N are respectively the two ends of the described circuit, L is the length of the described circuit, t _M is the moment when the M terminal receives the described voltage traveling wave, and t _N is the time when the N terminal receives the described voltage traveling wave. time, v is the frequency of the traveling wave, l ₁ is the distance between the fault point and the M terminal, l ₂ is the distance between the fault point and the N terminal, and l ₁ and l ₂ jointly represent the fault point In the second position where the line is located.

Optionally, the checking the validity of the first location according to the second location includes:

calculating an error between the first position and the second position;

If the error is smaller than a preset threshold, it is determined that the validity of the first position is valid.

According to another aspect of the present invention, a fault detection device for a distribution network is provided, including:

The electrical information collection module is used to collect electrical information for the target area in the distribution network, and the target area has a fault point where a fault occurs;

A multi-point monitoring module, configured to detect the first position of the fault point in the target area according to the electrical information under the assumption that the fault point is distributed on each branch of the target area;

A traveling wave ranging module, configured to detect a second position of the fault point in the target area according to a voltage traveling wave propagated by the fault point in the target area;

a location verification module, configured to verify the validity of the first location according to the second location;

A fault determination module, configured to determine that the fault point is at the first position in the target area if the verification of the first position is valid.

Optionally, the multipoint monitoring module includes:

A branch type query module, configured to query the branch types in the target area;

A single-branch processing module, configured to determine that the fault point is located on a single feeder in the target area if the branch type is a single-branch area, and detect that the fault point is located on a single feeder in the target area according to the electrical information. the first position on the said feeder line;

A multi-branch processing module, configured to sequentially assume that the fault points are distributed on each feeder line of the target area if the branch type is a multi-branch area, and according to all the fault points on the ports of each target area The electrical information detects the first position of the fault point on a certain feeder line.

Optionally, the multi-branch processing module includes:

A target line setting module, configured to set the fault point on a target line in the target area, where the target line is initially the first feeder in the target area;

a building block of ranging equations, configured to use the electrical information on the ports of the target area to form a multi-terminal fault ranging equations;

A ranging equation solving module, configured to solve the multi-terminal fault ranging equations to obtain a fault measurement value in which the fault point is located on the target line;

The fault measurement value judging module is used to judge whether the fault measurement value is within a preset fault range; if so, call the position calculation module, and if not, call the target line update module;

a position calculation module, configured to calculate the first position of the fault point on the target line according to the fault measurement value;

The target line update module is used to set the next feeder located at the current target line as a new target line, and return to execute the target line setting module, the distance measurement equation group building module, and the distance measurement equation group The solution module and the fault measurement value judging module.

Optionally, the electrical information includes the phase angle of the voltage and the phase angle of the current at the fault point;

The odometry equations building block is also used for:

Query the length of the target line;

substituting the fault measurement value, the phase angle of the voltage, the phase angle of the current and the length of the target line into a preset mapping function;

The value output by the mapping function is set to 0, as a multi-terminal fault distance measurement equation group.

Optionally, the traveling wave ranging module includes:

A line determination module, configured to determine the line where the fault point is located in the target area;

A voltage traveling wave acquisition module, configured to collect a voltage traveling wave propagating from the fault point to both ends of the line when a fault occurs at the fault point;

a propagation equations building module, configured to construct a propagation equations according to the moment when the voltage traveling wave is received at both ends of the line;

A propagation equation solving module, configured to solve the propagation equations to obtain the second position of the fault point on the line.

Optionally, the set of propagation equations includes:

Wherein, M and N are respectively the two ends of the described circuit, L is the length of the described circuit, t _M is the moment when the M terminal receives the described voltage traveling wave, and t _N is the time when the N terminal receives the described voltage traveling wave. time, v is the frequency of the traveling wave, l ₁ is the distance between the fault point and the M terminal, l ₂ is the distance between the fault point and the N terminal, and l ₁ and l ₂ jointly represent the fault point In the second position where the line is located.

Optionally, the position verification module includes:

an error calculation module, configured to calculate an error between the first position and the second position;

A valid determination module, configured to determine that the validity of the first position is valid if the error is smaller than a preset threshold.

According to another aspect of the present invention, an electronic device is provided, and the electronic device includes:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein,

The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor, so that the at least one processor can execute the method described in any embodiment of the present invention. Fault detection methods for distribution networks.

According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium stores a computer program, and the computer program is used to enable a processor to implement any of the embodiments of the present invention. Fault detection method for distribution network.

In this embodiment, the electrical information is collected for the target area in the distribution network, and there are fault points in the target area; under the assumption that the fault points are distributed on each branch of the target area, the fault points are detected according to the electrical information. The first position of the target area; the second position of the fault point in the target area is detected according to the voltage traveling wave propagated by the fault point in the target area; the validity of the first position is verified according to the second position; If it is verified that the first position is valid, it is determined that the fault point is at the first position in the target area. This embodiment locates the fault point from multiple dimensions, and verifies the first position of the hypothetical distribution to locate the fault point according to the second position of the fault point located by the voltage traveling wave, which can improve the accuracy of the fault point location, and, according to The second position of the voltage traveling wave to locate the fault point and the first position of the hypothetical distribution to locate the fault point have wide applicability and meet various business scenarios for fault point positioning.

It should be understood that the content described in this section is not intended to identify key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will be easily understood from the following description.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a flow chart of a fault detection method for a distribution network provided according to Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of a branch model provided according to Embodiment 1 of the present invention;

Fig. 3 is a schematic diagram of a voltage traveling wave transmission provided according to Embodiment 1 of the present invention;

4 is a schematic structural diagram of a fault detection device for a distribution network provided according to Embodiment 2 of the present invention;

FIG. 5 is a schematic structural diagram of an electronic device provided by Embodiment 3 of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions 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 It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Embodiment one

Figure 1 is a flow chart of a distribution network fault detection method provided by Embodiment 1 of the present invention. This embodiment is applicable to the results of using voltage traveling waves to locate distribution network faults and using multi-point monitoring to locate distribution network faults. In the case of verifying the result of the distribution network, the method can be executed by a fault detection device of the distribution network, which can be implemented in the form of hardware and/or software, and the fault detection device of the distribution network can be configured in electronic equipment. As shown in Figure 1, the method includes:

Step 101, collecting electrical information for a target area in the distribution network.

Multiple PUMs (phasor measurement units, synchronized phasor measurement units) are installed at the power outlets in the distribution network. The PUMs can continuously collect electrical information in the distribution network and upload it to the monitoring master station. The monitoring master station will The electrical information is uploaded to the server in the cloud for analysis.

Among them, PUM is a phasor measurement unit that uses the second pulse of the satellite positioning system as a synchronous clock, and can be used in the fields of dynamic monitoring, system protection, system analysis and prediction of power systems.

The clock-based PMU can measure the phasor data such as voltage phase and current phase of the power system pivot point, and transmit the data to the monitoring master station through the communication network. The monitoring master station determines the system when it is disturbed by the phase amplitude of different points. How to disconnect, cut off the machine and shed the load to prevent the further expansion of the accident or even the collapse of the power grid.

According to functional requirements, the PMU includes a synchronous sampling trigger pulse generation module, a synchrophasor measurement and calculation module, and a communication module.

The main function of the synchronous sampling trigger pulse generating module is to provide second pulse and current standard time (accurate to second). In order to reduce the dependence on the satellite positioning system, within a period of time after the satellite positioning system loses the satellite, the crystal oscillator of the machine provides a very accurate second pulse.

The input of the same measurement and calculation module is an analog AC signal, and its A/D (analog-to-digital converter) is triggered by an externally generated synchronous sampling pulse. After the digital-to-analog conversion is completed, an interrupt signal is sent to the signal processing module (DigitalSignal Processing, DSP ), the DSP performs digital Fourier transform DFF operation with the previous sampling data every time it reads a point of data, and obtains the amplitude and phase of the fundamental wave of the AC signal. After calculating the phase, DSP adds the corresponding time scale and sends the phasor data from the communication interface to the monitoring master station or saves it on the local common control machine.

In addition to the time scale at the time of the sampling point, the synchronous serial port communication data also measures the frequency of the current AC signal sent by the CPU (Central Processing Unit, central processing unit).

If a fault occurs in a certain area in the distribution network, it can be marked as a target area, that is, there is a fault point in the target area, and the electrical information collected in the target area is filtered from all electrical information, such as voltage , current, fault voltage, fault current, transition resistance, line length, etc., waiting to locate the fault point.

Step 102 , under the assumption that the fault points are distributed on each branch of the target area, detect the first position of the fault point in the target area according to the electrical information.

In this embodiment, for the electrical information of the target area, a multi-point monitoring method may be used to locate the fault point in the target area to obtain the first location.

Generally, the first location may be represented by the distance from the fault point to the PUM.

Among them, the multi-point monitoring method can refer to assume that the fault point is distributed in each feeder line (also called branch, line, etc.) , jointly analyze the feeder with the highest possibility, so as to locate the fault point at the first position of the feeder.

In one embodiment of the present invention, step 102 may include the following steps:

Step 1021, query the branch types in the target area.

In this embodiment, in order to locate the fault point in the target area, a single feeder in the target area can be modeled to obtain a branch model representing the single feeder.

As shown in Figure 2, the power supply G on the left represents a traditional power supply, especially fossil energy power supply, such as coal power supply, natural gas power supply, etc., and the power supply DG on the left side represents a distributed power supply, especially a new energy power supply, such as photovoltaic power supply, wind energy, etc. power supply etc.

PMUs are arranged at the outlet of the power supply. Assume that there is a fault point f on the line, the resistance of the fault point f is R _f , and the current flowing through the fault point f is I _f . The impedance is λZ, the impedance from collection point 2 to fault point f is (1-λ)Z, the voltage flowing through collection point 1 is U _1f , and the current is I _1f , the voltage flowing through collection point 2 is U _2f , and the current is I _2f .

According to the branch model, the target area can be divided into different branch types. Among them, the branch types include single-branch model and multi-branch model. The road model is that the target area contains at least two feeders conforming to the branch road model.

Step 1022. If the branch type is a single-branch area, determine that the fault point is located on a single feeder in the target area, and construct a double-terminal fault network based on electrical information such as voltage and current, so as to solve the double-terminal fault network and detect the fault point First position on a single feeder.

If the branch type of the target area is a single-branch area, that is, the target area has a single feeder, at this time, it can be determined that the fault point is located on a single feeder in the target area, and the voltage equation of the measurement point is constructed according to the electrical information detection. The real part and the imaginary part of the point voltage equation are separated to obtain the ranging equation group, and the Newton-Raphson method is used to solve the ranging equation group to obtain the first position of the fault point on a single feeder.

Step 1023. If the branch type is a multi-branch area, assume that the fault point is distributed on each feeder line of the target area in turn, and detect the position of the fault point on a certain feeder line according to the electrical information on the port of each target area. a location.

If the branch type of the target area is a single branch area, that is, the target area has a single feeder, at this time, it can be set in turn that the fault points are distributed on each feeder of the target area. The electrical information on the ports detects the first position of the fault point on a certain feeder.

In one embodiment of the present invention, step 1023 may further include the following steps:

Step 10231, set the fault point on the target line in the target area.

In this embodiment, the first position of the fault point on a certain feeder line is detected through multiple iterations. In each iteration, each feeder line can be set as the target line in the target area in sequence according to the sequence of numbers. , where the target line is initially the first feeder sorted in this order in the target area.

Step 10232, use the electrical information on the ports of the target area to form a multi-terminal fault location equation group.

On the basis of setting the fault point, the electrical information on each port of the target area can be used to form a voltage/impedance equation group according to the electrical relationship of current, voltage, impedance, etc. when the fault occurs, and the voltage/impedance equation group can be carried out. Simplify to obtain multi-terminal fault location equations.

Exemplarily, the electrical information includes the phase angle of the voltage at the fault point, the phase angle of the current, then, query the length of the target line, and substitute the fault measurement value, the phase angle of the voltage, the phase angle of the current and the length of the target line into the preset In the mapping function of , the output value of the mapping function is set to 0, which is used as a multi-terminal fault location equation group.

In this example, the multiterminal fault locating equations are expressed as follows:

Among them, f is the first position of the fault point, λ is the fault measurement value, L is the length of the target line, α is the phase angle of the voltage, and β is the phase angle of the current.

Step 10233: Solve the multi-terminal fault distance measurement equations to obtain the fault measure value that the fault point is on the target line.

In a specific implementation, methods such as the Newton-Raphson method can be used to solve the multi-terminal fault location equations to obtain the fault measure value that the fault point is on the target line.

Step 10234, judge whether the fault measurement value is within the preset fault range; if yes, execute step 10235, if not, execute step 10236.

Step 10235: Calculate the first position of the fault point on the target line according to the fault measure value.

Step 10236, set the next feeder line located on the current target line as the new target line, and return to step 10231-step 10234.

In this embodiment, it can be judged whether the fault metric value is within a preset fault range (such as (0, 1)), and if the fault metric value is within the preset fault range, the fault point is located within the target line in the current iteration. The probability is high. At this time, the first position of the fault point on the target line can be finally confirmed according to the fault measure value.

If the fault measurement value is outside the preset fault range, the probability that the fault point is located on the target line in the current iteration is low. At this time, the next feeder sorted on the current target line can be set as the new target according to the order of number line, enter the next iteration until the first position of the fault point on a certain feeder line is calculated.

Step 103 : Detect the second position of the fault point in the target area according to the voltage traveling wave propagated by the fault point in the target area.

In practical applications, the primary voltage has obvious traveling wave characteristics, and voltage singularity appears when the initial traveling wave and the reflected voltage traveling wave arrive. Due to the resonance of the internal inductance and capacitance of the CVT (capacitive voltage transformer), the frequency response of the CVT has multiple resonance points, and the high-frequency response is not good, especially the resonant damping CVT. The internal energy storage of the CVT causes the secondary voltage to not follow quickly. a voltage change.

However, the energy storage of fast saturated reactive damping CVT is much less than that of resonant damping CVT, but due to the stray capacitance inside CVT, its high-frequency response and high-frequency signal tracking ability are still unsatisfactory. Low-frequency and high-frequency oscillations, the head of the traveling wave is smoothed and stretched, and corresponding to the arrival of the initial traveling wave, the secondary voltage has obvious high-frequency oscillations at the fault point.

Due to the attenuation of the line and the refraction and reflection at the fault point and the busbar, the amplitude of the subsequent traveling wave is greatly reduced, but it can still be reflected in the secondary voltage of the CVT.

It can be seen that although the traveling wave characteristics of the CVT secondary voltage are not as obvious as those of the primary voltage, the arrival of the primary traveling wave can still be reflected in the secondary voltage. The secondary voltage contains the arrival information of the primary traveling wave, among which the initial traveling wave is the most obvious, and the detection of the subsequent catadioptric wave is relatively clear. Therefore, the fault traveling wave distance measurement function can still be realized directly by means of the CVT secondary voltage.

Then, in this embodiment, sensors such as CVT can be used to detect the traveling voltage wave propagating in the target area, and the second position of the fault point in the target area can be detected according to the voltage traveling wave propagating in the target area of the fault point.

In the specific implementation, determine the line where the fault point is located in the target area, and a synchronous timing device is installed at both ends of the line. The synchronous timing device can be an independent sensor or a module in a satellite positioning system and other components. , which is not limited in this embodiment.

Use sensors such as CVT to collect the voltage traveling wave that propagates from the fault point to both ends of the line when a fault occurs at the fault point, and realize the traveling wave ranging method. The propagation equations are constructed based on the time when the voltage traveling wave is received at both ends of the line. The propagation equations are solved to obtain the second position of the fault point on the line.

Further, as shown in Figure 3, assume that a fault occurs at the fault point F on the line at time t, and voltage traveling waves are generated. M and N are the two ends of the line respectively, L is the length of the line, and l ₁ is the fault point and M terminal , l ₂ is the distance between the fault point and the N terminal, t _M is the moment when the M terminal receives the voltage traveling wave, and t _N is the moment when the N terminal receives the voltage traveling wave.

Then, the propagation equations include:

l ₁ ＝v(t _M -t)]

l ₂ ＝v(t _N -t)]

Eliminate the moment t when the fault occurs, and substitute l ₁ +l ₂ =L into the propagation equations, the propagation equations are simplified as:

Among them, v is the frequency of the traveling wave, and l ₁ and l ₂ together represent the second position of the fault point on the line.

Step 104: Verify the validity of the first location according to the second location.

In this embodiment, the first position calculated by the multi-point monitoring method can be used as the main, and the second position calculated by the traveling wave ranging method can be used as a supplementary, and the validity of the first position can be verified according to the second position, that is, the verification Whether the first position is valid.

In a specific implementation, the difference between the first position and the second position may be calculated as an error, and the error is compared with a preset threshold.

If the error is smaller than the preset threshold, it means that the difference between the first position and the second position is small, and it can be determined that the validity of the first position is valid.

Step 105, if the first position is verified to be valid, it is determined that the fault point is at the first position in the target area.

If the verification of the validity of the first position is valid, the first position can be regarded as the final result of the fault detection, and it is determined that the fault point is at the first position in the target area.

In this embodiment, the electrical information is collected for the target area in the distribution network, and there are fault points in the target area; under the assumption that the fault points are distributed on each branch of the target area, the fault points are detected according to the electrical information. The first position of the target area; the second position of the fault point in the target area is detected according to the voltage traveling wave propagated by the fault point in the target area; the validity of the first position is verified according to the second position; If it is verified that the first position is valid, it is determined that the fault point is at the first position in the target area. This embodiment locates the fault point from multiple dimensions, and verifies the first position of the hypothetical distribution to locate the fault point according to the second position of the fault point located by the voltage traveling wave, which can improve the accuracy of the fault point location, and, according to The second position of the voltage traveling wave to locate the fault point and the first position of the hypothetical distribution to locate the fault point have wide applicability and meet various business scenarios for fault point positioning.

Embodiment two

Fig. 4 is a schematic structural diagram of a fault detection device for a distribution network provided by Embodiment 2 of the present invention. As shown in Figure 4, the device includes:

The electrical information collection module 401 is used to collect electrical information for a target area in the distribution network, and the target area has a fault point where a fault occurs;

A multi-point monitoring module 402, configured to detect the first position of the fault point in the target area according to the electrical information under the assumption that the fault point is distributed on each branch of the target area;

A traveling wave ranging module 403, configured to detect a second position of the fault point in the target area according to a voltage traveling wave propagated by the fault point in the target area;

A location checking module 404, configured to check the validity of the first location according to the second location;

The fault determination module 405 is configured to determine that the fault point is in the first position in the target area if the verification of the first position is valid.

In one embodiment of the present invention, the multi-point monitoring module 402 includes:

A branch type query module, configured to query the branch types in the target area;

A single-branch processing module, configured to determine that the fault point is located on a single feeder in the target area if the branch type is a single-branch area, and detect that the fault point is located on a single feeder in the target area according to the electrical information. the first position on the said feeder line;

A multi-branch processing module, configured to sequentially assume that the fault points are distributed on each feeder line of the target area if the branch type is a multi-branch area, and according to all the fault points on the ports of each target area The electrical information detects the first position of the fault point on a certain feeder line.

In one embodiment of the present invention, the multi-branch processing module includes:

A target line setting module, configured to set the fault point on a target line in the target area, where the target line is initially the first feeder in the target area;

a building block of ranging equations, configured to use the electrical information on the ports of the target area to form a multi-terminal fault ranging equations;

A ranging equation solving module, configured to solve the multi-terminal fault ranging equations to obtain a fault measurement value in which the fault point is located on the target line;

The fault measurement value judging module is used to judge whether the fault measurement value is within a preset fault range; if so, call the position calculation module, and if not, call the target line update module;

a position calculation module, configured to calculate the first position of the fault point on the target line according to the fault measurement value;

The target line update module is used to set the next feeder located at the current target line as a new target line, and return to execute the target line setting module, the distance measurement equation group building module, and the distance measurement equation group The solution module and the fault measurement value judging module.

In one embodiment of the present invention, the electrical information includes the phase angle of the voltage and the phase angle of the current at the fault point;

The odometry equations building block is also used for:

Query the length of the target line;

substituting the fault measurement value, the phase angle of the voltage, the phase angle of the current and the length of the target line into a preset mapping function;

The value output by the mapping function is set to 0, as a multi-terminal fault distance measurement equation group.

In one embodiment of the present invention, the traveling wave ranging module 403 includes:

A line determination module, configured to determine the line where the fault point is located in the target area;

A voltage traveling wave acquisition module, configured to collect a voltage traveling wave propagating from the fault point to both ends of the line when a fault occurs at the fault point;

a propagation equations building module, configured to construct a propagation equations according to the moment when the voltage traveling wave is received at both ends of the line;

A propagation equation solving module, configured to solve the propagation equations to obtain the second position of the fault point on the line.

In one embodiment of the present invention, the propagation equations include:

Wherein, M and N are respectively the two ends of the described circuit, L is the length of the described circuit, t _M is the moment when the M terminal receives the described voltage traveling wave, and t _N is the time when the N terminal receives the described voltage traveling wave. time, v is the frequency of the traveling wave, l ₁ is the distance between the fault point and the M terminal, l ₂ is the distance between the fault point and the N terminal, and l ₁ and l ₂ jointly represent the fault point In the second position where the line is located.

In one embodiment of the present invention, the location verification module 404 includes:

an error calculation module, configured to calculate an error between the first position and the second position;

A valid determination module, configured to determine that the validity of the first position is valid if the error is smaller than a preset threshold.

The fault detection device of the distribution network provided by the embodiment of the present invention can execute the fault detection method of the distribution network provided by any embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the fault detection method of the distribution network.

Embodiment three

FIG. 5 shows a schematic structural diagram of an electronic device 10 that can be used to implement an embodiment of the present invention. Electronic device is intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. Electronic devices may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (eg, helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are by way of example only, and are not intended to limit implementations of the inventions described and/or claimed herein.

As shown in FIG. 5 , the electronic device 10 includes at least one processor 11, and a memory connected in communication with the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores There is a computer program executable by at least one processor, and the processor 11 can operate according to a computer program stored in a read-only memory (ROM) 12 or loaded from a storage unit 18 into a random access memory (RAM) 13. Various appropriate actions and processes are performed. In the RAM 13, various programs and data necessary for the operation of the electronic device 10 are also stored. The processor 11 , ROM 12 , and RAM 13 are connected to each other through a bus 14 . An input/output (I/O) interface 15 is also connected to the bus 14 .

Multiple components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, and the like. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices through a computer network such as the Internet and/or various telecommunication networks.

Processor 11 may be various general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, central processing units (CPUs), graphics processing units (GPUs), various dedicated artificial intelligence (AI) computing chips, various processors that run machine learning model algorithms, digital signal processing processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes various methods and processes described above, such as a fault detection method of a power distribution network.

In some embodiments, the fault detection method of a power distribution network may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as the storage unit 18 . In some embodiments, part or all of the computer program may be loaded and/or installed on the electronic device 10 via the ROM 12 and/or the communication unit 19 . When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the above-described fault detection method of the distribution network may be performed. Alternatively, in other embodiments, the processor 11 may be configured in any other suitable way (for example, by means of firmware) to execute a fault detection method of a power distribution network.

Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips Implemented in a system of systems (SOC), load programmable logic device (CPLD), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include being implemented in one or more computer programs executable and/or interpreted on a programmable system including at least one programmable processor, the programmable processor Can be special-purpose or general-purpose programmable processor, can receive data and instruction from storage system, at least one input device, and at least one output device, and transmit data and instruction to this storage system, this at least one input device, and this at least one output device an output device.

Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, so that the computer program causes the functions/operations specified in the flowcharts and/or block diagrams to be implemented when executed by the processor. A computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of the present invention, a computer readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus or device. A computer readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, a computer readable storage medium may be a machine readable signal medium. More specific examples of machine-readable storage media would include one or more wire-based electrical connections, portable computer discs, hard drives, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory), optical fiber, compact disk read only memory (CD-ROM), optical storage, magnetic storage, or any suitable combination of the foregoing.

In order to provide interaction with the user, the systems and techniques described herein can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display)) for displaying information to the user. monitor); and a keyboard and pointing device (eg, a mouse or a trackball) through which the user can provide input to the electronic device. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and can be in any form (including Acoustic input, speech input or, tactile input) to receive input from the user.

The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., as a a user computer having a graphical user interface or web browser through which a user can interact with embodiments of the systems and techniques described herein), or including such backend components, middleware components, Or any combination of front-end components in a computing system. The components of the system can be interconnected by any form or medium of digital data communication, eg, a communication network. Examples of communication networks include: local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

A computing system can include clients and servers. Clients and servers are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also known as a cloud computing server or a cloud host. It is a host product in the cloud computing service system to solve the problems of difficult management and weak business expansion in traditional physical hosts and VPS services. defect.

Embodiment four

The embodiment of the present invention also provides a computer program product, the computer program product includes a computer program, and when the computer program is executed by a processor, the fault detection method of the distribution network provided by any embodiment of the present invention is implemented.

During the implementation of the computer program product, the computer program code for performing the operation of the present invention can be written in one or more programming languages or a combination thereof, and the programming language includes an object-oriented programming language, such as Java, Smalltalk , C++, and also conventional procedural programming languages such as the "C" language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In cases involving a remote computer, the remote computer can be connected to the user computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (such as through an Internet service provider). Internet connection).

It should be understood that steps may be reordered, added or deleted using the various forms of flow shown above. For example, each step described in the present invention may be executed in parallel, sequentially, or in a different order, as long as the desired result of the technical solution of the present invention can be achieved, there is no limitation herein.

The above specific implementation methods do not constitute a limitation to the protection scope of the present invention. It should be apparent to those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made depending on design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A fault detection method for distribution network, characterized in that, comprising: Collecting electrical information for a target area in the distribution network, where there is a fault point where a fault occurs; Detecting the first position of the fault point in the target area according to the electrical information under the assumption that the fault point is distributed on each branch of the target area; detecting a second position of the fault point in the target area according to the voltage traveling wave propagated by the fault point in the target area; verifying the validity of the first location according to the second location; If it is verified that the first position is valid, it is determined that the fault point is at the first position in the target area. 2. The method according to claim 1, characterized in that, under the condition of assuming that the fault points are distributed on each branch of the target area, according to the electrical information, it is detected that the fault points are on the The first location where the target area is located, including: Query the branch types in the target area; If the branch type is a single branch area, it is determined that the fault point is located on a single feeder in the target area, and the first position of the fault point on a single feeder is detected according to the electrical information. Location; If the branch type is a multi-branch area, sequentially assume that the fault points are distributed on each feeder line of the target area, and detect the fault point according to the electrical information on the ports of each target area The first position on one of said feeders. 3. The method according to claim 2, characterized in that, assuming in turn that the fault points are distributed on each feeder line of the target area, detecting all fault points according to the electrical information on the port of the target area The first position of the above-mentioned fault point on one of the above-mentioned feeder lines, including: setting the fault point at a target line in the target area, where the target line is initially the first feeder in the target area; using the electrical information on the ports of the target area to form a multi-terminal fault locating equation; Solving the multi-terminal fault distance measurement equations to obtain a fault measurement value at which the fault point is located on the target line; judging whether the fault measurement value is within a preset fault range; If so, calculating the first position of the fault point on the target line according to the fault measure value; If not, set the next feeder line located at the current target line as a new target line, and return to performing the determination that the fault point is set in the target line in the target area. 4. method according to claim 3, is characterized in that, described electric information comprises the phase angle of the voltage of described fault point, the phase angle of electric current; The electrical information on the ports of the target area is used to form a multi-terminal fault location equation group, including: Query the length of the target line; substituting the fault measurement value, the phase angle of the voltage, the phase angle of the current and the length of the target line into a preset mapping function; The value output by the mapping function is set to 0, as a multi-terminal fault distance measurement equation group. 5. The method according to claim 1, wherein the detecting the second position of the fault point in the target area according to the voltage traveling wave propagated by the fault point in the target area comprises : Determining the line where the fault point is located in the target area; collecting traveling voltage waves propagating from the fault point to both ends of the line when a fault occurs at the fault point; constructing a set of propagation equations according to the moment when the voltage traveling wave is received at both ends of the line; Solving the set of propagation equations to obtain a second position of the fault point on the line. 6. The method according to claim 5, wherein the set of propagation equations comprises:

Wherein, M and N are respectively the two ends of the described circuit, L is the length of the described circuit, t _M is the moment when the M terminal receives the described voltage traveling wave, and t _N is the time when the N terminal receives the described voltage traveling wave. time, v is the frequency of the traveling wave, l ₁ is the distance between the fault point and the M terminal, l ₂ is the distance between the fault point and the N terminal, and l ₁ and l ₂ jointly represent the fault point In the second position where the line is located. 7. The method according to any one of claims 1-6, wherein the checking the validity of the first position according to the second position comprises: calculating an error between the first position and the second position; If the error is smaller than a preset threshold, it is determined that the validity of the first position is valid. 8. A fault detection device for a distribution network, characterized in that it comprises: The electrical information collection module is used to collect electrical information for the target area in the distribution network, and the target area has a fault point where a fault occurs; A multi-point monitoring module, configured to detect the first position of the fault point in the target area according to the electrical information under the assumption that the fault point is distributed on each branch of the target area; A traveling wave ranging module, configured to detect a second position of the fault point in the target area according to a voltage traveling wave propagated by the fault point in the target area; a location verification module, configured to verify the validity of the first location according to the second location; A fault determination module, configured to determine that the fault point is at the first position in the target area if the verification of the first position is valid. 9. An electronic device, characterized in that the electronic device comprises: at least one processor; and a memory communicatively coupled to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, the computer program is executed by the at least one processor, so that the at least one processor can perform any one of claims 1-7 The fault detection method of the distribution network. 10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and the computer program is used to enable a processor to implement the method described in any one of claims 1-7. Fault detection methods for distribution networks.

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