Centralized FA broken line positioning criterion anti-interference method considering noise interference

Abstract

The invention discloses a centralized FA broken line positioning criterion anti-interference method considering noise interference, and the method comprises the steps: collecting the data of each node of a power distribution network line in real time, building a sequence component network model under a single-phase broken line ungrounded fault, carrying out the dynamic threshold analysis of an electrical quantity through employing a sliding time window algorithm, and setting an electrical quantity mutation criterion. And constructing an anti-interference criterion, determining whether to trigger fault positioning or not through the anti-interference criterion when sudden change of electrical quantity occurs, determining a fault section in combination with topology analysis when fault positioning is performed, and controlling upstream and downstream switches to isolate the fault and transfer the fault to a non-fault section. According to the scheme, various noise interferences in the power distribution network are effectively suppressed, the accuracy of fault signal judgment is improved, and the conditions of misjudgment and missed judgment are reduced; secondly, considering different conditions of the power distribution network, performing targeted setting and adjustment on a sequence component network model, an anti-interference criterion threshold value and the like, so that the method can adapt to a complex power distribution network operation environment, and the reliability of fault positioning is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of power distribution network fault analysis, and particularly relates to a centralized FA broken line positioning criterion anti-interference method considering noise interference. BACKGROUND

[0002] The single-phase broken line fault of a transformer substation cannot be positioned by means of section test pulling and other methods, resulting in repeated power outage of a large number of users and other problems. When a single-phase broken line fault occurs in a distribution network, there is no obvious overcurrent and the like, and although the three-phase voltage is unbalanced, the difference is not obvious, the distribution network can still operate with the fault. In actual dispatching and operation work, the effect of section test pulling is not obvious, and it is difficult for distribution operation and maintenance personnel to find the broken line fault by line inspection, and the fault can only be detected by user feedback, so the fault finding is blind, time-consuming and laborious, which does not meet the requirements of new-type distribution network fault self-healing and the like.

[0003] In the operation process of a distribution network, broken line fault is one of the common fault types, and accurately and quickly positioning the broken line fault section is crucial to guarantee the reliable operation of the distribution network. However, on the one hand, various noise interferences exist in the distribution network, such as electromagnetic interference, measurement noise and the like, and these noises will seriously affect the feature extraction and judgment of the fault signal, leading to the decrease in the accuracy of fault positioning. On the other hand, the structure of the distribution network is complex, and contains various grounding modes, distributed power supply access and the like, and the existing positioning methods are difficult to adapt to these complex working conditions, and cannot accurately distinguish the fault signal and the normal fluctuation signal, which is prone to misjudgment or omission, thereby affecting the timeliness and effectiveness of fault handling. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide a centralized FA broken line positioning criterion anti-interference method considering noise interference.

[0005] The specific technical scheme for realizing the purpose of the present application is as follows:

[0006] A centralized FA broken line positioning criterion anti-interference method considering noise interference, comprising the following steps:

[0007] Step 1, real-time acquisition of three-phase voltage and current signals of each node of the distribution network line;

[0008] Step 2, calculation of positive sequence, negative sequence and zero sequence voltage and current components based on the symmetrical component method, and establishment of a sequence component network model under single-phase broken line non-grounding fault;

[0009] Step 3, dynamic threshold analysis of electrical quantities by means of a sliding time window algorithm, and setting of an electrical quantity mutation criterion;

[0010] Step 4, construction of an anti-interference criterion, and determination of whether to trigger fault positioning by means of the anti-interference criterion when an electrical quantity mutation occurs;

[0011] Step 5: When locating the fault, combine topology analysis to determine the faulty section, and control the upstream and downstream switches to isolate the fault and transfer power to the non-faulty section.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] (1) The solution of the present invention effectively suppresses various noise interferences in the distribution network by adopting a sliding time window algorithm for dynamic threshold analysis, constructing anti-interference criteria based on negative / zero sequence voltage-current correlation coefficients, and performing communication delay compensation, thereby improving the accuracy of fault signal judgment and reducing misjudgment and missed judgment. Secondly, considering different grounding methods and distributed power supply access in the distribution network, the sequence component network model and anti-interference criterion thresholds are set and adjusted in a targeted manner, so that the method can adapt to the complex distribution network operating environment and improve the reliability of fault location.

[0014] (2) The solution of the present invention combines topology analysis and node directionality criteria, which can quickly and accurately determine the fault section, providing strong support for timely fault handling, and thereby reducing the power outage time and range and improving the power supply reliability of the distribution network. On the other hand, by optimizing and adjusting the model parameters and dynamically adjusting the threshold coefficient, the method is more flexible and practical, and can be reasonably adjusted according to the actual situation to meet the needs of different distribution networks.

[0015] The present invention will be further described below with reference to specific embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the anti-interference method for centralized FA disconnection location criteria considering noise interference according to the present invention. Detailed Implementation

[0017] Example

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0021] Combination Figure 1 An anti-interference method for centralized FA disconnection location criteria considering noise interference, comprising the following steps:

[0022] Step 1: Real-time acquisition of three-phase voltage and current signals at each node of the distribution network line;

[0023] This step provides the foundational data for subsequent fault analysis, ensuring the real-time nature and accuracy of the data. Furthermore, this step is the data source for the entire method, and the quality of the data collected directly affects the accuracy of all subsequent analytical results. High-quality data acquisition is a prerequisite for accurate fault localization.

[0024] Step 2: Calculate the positive sequence, negative sequence, and zero sequence voltage and current components based on the symmetrical component method, and establish a sequence component network model under a single-phase open-circuit ungrounded fault.

[0025] The ordered component network model satisfies:

[0026] Neutral grounding provides impedance for the zero-sequence path. And satisfy ≤0.1* This is to ensure that the zero-sequence current can flow effectively and be detected. When a fault occurs, the magnitude and distribution of the zero-sequence current are closely related to the zero-sequence impedance. A smaller zero-sequence impedance relative to the load impedance can make the zero-sequence current more significant during a fault, making it easier to accurately detect and locate the fault. It also helps to improve the identifiability of fault characteristics and reduce the impact of noise interference on fault judgment.

[0027] Line-to-ground capacitance Ratio to load impedance ≥10* This ensures that the capacitive reactance of the line to ground is much greater than the load impedance. In fault analysis, the presence of the line to ground capacitance affects the distribution and phase of the fault current. When the capacitive reactance is large enough, the influence of the line to ground capacitance on the fault current is relatively small, making the fault characteristics closer to the ideal situation. This is beneficial for accurately extracting fault information, improving the accuracy of line break location, and reducing errors caused by noise interference.

[0028] Voltage amplitude attenuation rate downstream of the fault point = ≤0.3, where The voltage upstream of the fault point. This refers to the voltage downstream of the fault point. This is to ensure that there is still a certain voltage level downstream of the fault point so that the relevant measurement and protection devices can function normally. At the same time, this voltage distribution characteristic also helps to accurately determine the fault location. If the voltage attenuation is too drastic, it may lead to weak measurement signals in the downstream area, increase the impact of noise interference, and make fault location difficult. Meeting this attenuation rate requirement ensures that the system still has good observability and detectability under fault conditions.

[0029] The positive-sequence, negative-sequence, and zero-sequence voltage and current components are calculated based on the symmetrical component method, which can decompose complex three-phase electrical quantities into simple sequence components, making it easier to analyze the electrical characteristics under a single-phase open-circuit ungrounded fault. A sequence component network model under a single-phase open-circuit ungrounded fault is established and meets specific conditions (the neutral grounding method provides impedance for the zero-sequence path and meets certain relationships, the ratio of line-to-ground capacitance to load impedance is required, and the voltage amplitude attenuation rate downstream of the fault point is required).

[0030] In addition, after the ordinal component network model is constructed, parameter sensitivity analysis is performed on the ordinal component network model to determine the degree of influence of key parameters on fault characteristics. Based on the analysis results, the model parameters are optimized and adjusted, which can make the model more consistent with the actual fault situation and more accurately reflect the fault characteristics.

[0031] Specifically, the sequence component network model describes the distribution and variation of sequence components under a single-phase open-circuit ungrounded fault, clarifies the reasonable value range of each sequence component under normal and fault conditions, and the impact of system characteristics on electrical quantities. Based on these, the sliding time window algorithm can more scientifically and reasonably set the dynamic threshold of the electrical quantity change criterion, avoiding misjudgment or omission. The model determines the sequence component characteristics under a single-phase open-circuit ungrounded fault, such as the voltage amplitude attenuation rate upstream and downstream of the fault point. The anti-interference criterion judges whether it is a real fault based on these characteristic quantities, which can better distinguish between faults and noise interference, and improve the accuracy and effectiveness of the criterion. The model provides the distribution law of electrical quantities under fault conditions. When combining topology analysis to determine the fault section, these laws can be used to narrow the fault search range, improve the fault location accuracy and efficiency, and guide the operation of upstream and downstream switches to ensure the safety and reliability of isolating the fault and transferring power to the non-faulty section.

[0032] This step provides a theoretical model and analytical framework for fault analysis. By analyzing the sequence components and optimizing the model, we can gain a deeper understanding of the fault mechanism and provide theoretical support for subsequent dynamic threshold analysis and anti-interference criterion construction. It is a key foundation for accurate fault location.

[0033] Step 3: Use the sliding time window algorithm to perform dynamic threshold analysis on electrical quantities and set the criteria for sudden changes in electrical quantities;

[0034] The sliding time window is used to estimate the "normal fluctuation level" (mean, standard deviation, historical maximum variation, etc.) of the current node voltage / current in real time, so as to obtain a threshold that adapts to time and avoids false alarms or missed alarms caused by using a fixed threshold.

[0035] The sliding window does not directly determine "fault" or "distance", but is used to distinguish between "normal / historical fluctuations" and "sudden changes beyond the normal range". Therefore, it is the first screening to reduce blind triggering caused by noise.

[0036] The electrical quantity change criterion includes the voltage change criterion and Current Sudden Change Criterion ;

[0037]

[0038]

[0039] in, Rated voltage, For noise margin, and ≤5% , Rated current, ≤8% This is the tolerance value. , This is the dynamic threshold coefficient.

[0040] The noise tolerance and tolerance value The dynamic adjustment process is as follows:

[0041] Based on historical data, the range of electrical quantity fluctuations during normal operation was statistically analyzed to determine the noise tolerance. The initial value is taken in this embodiment. =1.2;

[0042] Wavelet transform is used to process the electrical quantities of the power distribution network system and filter out high-frequency noise components with frequencies higher than a certain threshold.

[0043] Noise tolerance is adaptively adjusted based on the grounding method of the distribution network system. This includes a 10% reduction in the tolerance for arc suppression coil grounding systems and a 5% increase in the tolerance for low-resistance grounding systems;

[0044] The dynamic threshold coefficient , Based on system load rate Adjustment:

[0045] When system load rate When the value exceeds the set first threshold, the dynamic threshold coefficient will be adjusted. , Improved adaptability;

[0046] When system load rate When the value is less than the set second threshold, the dynamic threshold coefficient will be adjusted. , Reduced adaptability;

[0047] For example, in this embodiment, when ≥80%, , Increase by 15%; when ≤30%, , Reduce by 10%.

[0048] The noise tolerance is dynamically adjusted based on historical data statistics, wavelet transform to filter out high-frequency noise, and adaptive correction according to the system grounding method, so that the criterion can adapt to different operating environments and noise conditions. At the same time, the dynamic threshold coefficient is adjusted according to the load rate, which further improves the adaptability and accuracy of the criterion.

[0049] Meanwhile, this step, through dynamic threshold analysis, can more flexibly and accurately determine whether changes in electrical quantities are caused by faults, effectively reducing misjudgments caused by noise interference and normal operation fluctuations, and improving the reliability of fault detection.

[0050] Step 4: Construct anti-interference criteria. When a sudden change in electrical quantity occurs, determine whether fault location is triggered by the anti-interference criteria.

[0051] The anti-interference criterion is:

[0052]

[0053] in, This represents the negative-sequence / zero-sequence voltage-current correlation coefficient. For the corresponding negative sequence / zero sequence voltage With current covariance, It is negative sequence / zero sequence voltage standard deviation It is electric current Standard deviation;

[0054] An anti-interference criterion is constructed based on the negative-sequence / zero-sequence voltage-current correlation coefficient. Fault location is triggered when the correlation coefficient criterion reaches a threshold and the duration exceeds the duration threshold. Specifically:

[0055] When the negative sequence / zero sequence voltage-current correlation coefficient Greater than or equal to the relevant set threshold And the duration exceeds the set duration threshold. Fault location is triggered in time.

[0056] In addition, the threshold The setting rules are as follows:

[0057] Arc suppression coil grounding system Take 0.85-0.92;

[0058] Low-resistance grounding system Take 0.78-0.85;

[0059] Distance from the fault point Revised to

[0060] in, is the initial threshold, and d is the electrical distance from the node to the fault point, which is used to correct the criterion threshold to reflect the expected response difference between the node and the fault point;

[0061] The same fault will produce a stronger and more prominent sequence component response at measurement points closer to the fault point, while the impact on measurement points further away will be attenuated by sound velocity due to line impedance, capacitance to ground, etc., and drowned out by noise. Using a fixed threshold will result in undersensitivity at distant points or oversensitivity at near points, causing missed or false alarms. Therefore, the introduction of d allows the threshold to vary with distance. And the "preset d" here does not mean "knowing the exact distance of the actual fault point in advance". The preset d can be a preset "distance-threshold" mapping or parameterized function, which is read / calculated at runtime according to nodes and candidate positions, rather than requiring the actual fault point to be known before setting the threshold.

[0062] The threshold of the correlation coefficient criterion is set according to different system grounding methods and adjusted according to the distance of the fault point so that the criterion can better adapt to different fault conditions.

[0063] This criterion is the key basis for determining whether a fault has occurred. By comprehensively considering the relationship between negative sequence / zero sequence voltage and current, it can effectively distinguish between fault signals and noise signals, further improve the accuracy of fault location, and reduce false alarms and missed alarms.

[0064] Step 5: When locating the fault, combine topology analysis to determine the faulty section, and control the upstream and downstream switches to isolate the fault and transfer power to the non-faulty section.

[0065] The analysis criteria for fault location include:

[0066] Node directionality criterion: negative-sequence / zero-sequence voltage-current correlation coefficient of the upstream node of the faulty node. The value decreases, indicating the negative / zero sequence voltage-current correlation coefficient of the downstream node of the faulty node. The value increases;

[0067] Topological constraints: The fault section is located at the negative sequence / zero sequence voltage-current correlation coefficient. The segment between points of value abrupt change and with the shortest electrical distance from the power source;

[0068] Communication delay compensation: Lagrange interpolation is used to synchronize node data with a timescale deviation exceeding 2ms;

[0069] Data from fiber optic communication nodes is processed first, while data from wireless communication nodes is given a lower weight, such as 20%, to ensure data consistency and reliability and avoid the impact of communication delays on fault location.

[0070] In distribution networks containing distributed generation:

[0071] The injected current from the distributed source needs to be converted into the equivalent negative sequence impedance. And satisfy ≥ If the proportion of distributed power supply capacity exceeds a certain value, then the threshold is set. Accordingly, the threshold is increased; for example, if the proportion of distributed power supply capacity exceeds 15%, then... The value was increased by 0.05 to make the method adaptable to the situation of distributed power source access.

[0072] This step comprehensively identifies the faulty section through multiple methods, improving the accuracy and reliability of fault location, ensuring that the faulty section can be quickly and accurately isolated and power transferred to non-faulty sections, and reducing the scope and duration of power outages.

[0073] This embodiment uses PSCAD to simulate and verify various actual fault conditions and noise environments, and comprehensively verifies the method proposed in this application. Specifically, a 10kV distribution network model with 3 to 5 branches and a line length of 1 to 5 km is constructed.

[0074] The fault scenario library for line breakage includes: single-phase line breakage without grounding, line breakage accompanied by high-resistance grounding, and line breakage accompanied by distributed power backflow.

[0075] In the noise interference test, Gaussian white noise with a signal-to-noise ratio of 20~30dB is superimposed.

[0076] Simulation Scenario 1:

[0077] A 10kV distribution network line has its neutral point grounded via an arc suppression coil, and the load... =65%;

[0078] Noise environment: Superimposed Gaussian white noise with SNR=25dB and periodic impulse interference;

[0079] Implementation steps:

[0080] Dynamic threshold setting:

[0081] Pick =0.2, =10.5kV, based on historical data =1.8% ,calculate =1.2 =2.16% ;

[0082] After filtering out noise above 1kHz using wavelet transform, it is corrected to =1.5% Therefore, the voltage change criterion =0.2×10.5kV+157.5V=2.257kV

[0083] Table 1 shows a comparison with traditional fixed thresholds:

[0084] Table 1

[0085] Judgment basis Malfunction times (100 test times) Missed judgment times Fixed threshold (2 kV) 12 5 Solid-state threshold of the present application 3 1

[0086] Conclusion: Table 1 shows that the dynamic threshold reduces the false positive rate by 75% and the false negative rate by 80%.

[0087] Simulated Scenario 2 (Grounding Method Adaptability Verification)

[0088] Test scenario:

[0089] The same line is set to be grounded with arc suppression coils respectively. =1000Ω) and grounding with small resistance ( =10Ω)

[0090] Correlation coefficient threshold setting:

[0091] Arc suppression coil system: =0.88 (Small zero-sequence current, requiring high sensitivity)

[0092] Small resistance system: =0.82 (Large zero-sequence current, priority given to anti-interference)

[0093] Fault location results:

[0094] Arc suppression coil system:

[0095] Distance from the fault point =2km, =0.845, actual measurement =0.851, location was successfully triggered.

[0096] Small resistance system: same location =0.803 (due to low zero-sequence path impedance), not reaching the threshold, to avoid malfunction.

[0097] Conclusion: The adaptive grounding strategy enables positioning accuracy of over 95% for different systems.

[0098] Simulation Scenario 3

[0099] Model parameters:

[0100] Includes 2 photovoltaic inverters (18% of total capacity), equivalent negative sequence impedance =15Ω negative sequence impedance of the line =3Ω, which satisfies ≥

[0101] Threshold correction:

[0102] initial =0.85, corrected to 0.85 + 0.05 = 0.90 because DG capacity exceeds 15%.

[0103] Actual measurement =0.893ρ=0.893 (before correction, 0.893>0.85, which would lead to misjudgment), after correction, it was not triggered.

[0104] Conclusion: The false alarm rate in the DG reverse transmission scenario decreased from 12% to 2%.

[0105] Simulation Scenario 4

[0106] (Verification of communication delay compensation)

[0107] Test data:

[0108] Node A (fiber): Time scale deviation 0.5ms

[0109] Node B (wireless): Time scale deviation 3.2ms

[0110] Compensation processing:

[0111] Lagrange interpolation was used for synchronization at node B, and the corrected deviation was ≤0.8ms.

[0112] The data weight of node B was reduced from 1.0 to 0.8.

[0113] Table 2 shows the comparison of positioning errors:

[0114] Table 2

[0115] Compensation method Fault section positioning error (m) No compensation 320 Compensation method of the present application 85

[0116] Conclusion: Based on Table 2, it can be seen that the positioning error after compensation is reduced from 320m to 85m, which meets the accuracy requirements for fault location in the distribution network (industry standards usually require ≤100m).

[0117] The weight of fiber optic nodes remains at 1.0, while the weight of wireless nodes is reduced to 0.8. This preserves the value of wireless data while suppressing the error amplification effect caused by its high latency.

[0118] The solution of this invention effectively suppresses various noise interferences in the distribution network by employing a sliding time window algorithm for dynamic threshold analysis, constructing anti-interference criteria based on negative / zero sequence voltage-current correlation coefficients, and performing communication delay compensation. This improves the accuracy of fault signal judgment and reduces misjudgments and omissions. Secondly, considering different grounding methods and distributed power source access in the distribution network, the sequence component network model and anti-interference criterion thresholds are specifically set and adjusted to enable the method to adapt to complex distribution network operating environments and improve the reliability of fault location.

[0119] By combining topology analysis and node directionality criteria, the fault section can be quickly and accurately identified, providing strong support for timely fault handling. Based on this, the power outage time and range can be reduced, and the power supply reliability of the distribution network can be improved. On the other hand, by optimizing and adjusting the model parameters and dynamically adjusting the threshold coefficient, the method becomes more flexible and practical, and can be reasonably adjusted according to the actual situation to meet the needs of different distribution networks.

[0120] In addition, this solution also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the following steps:

[0121] Step 1: Real-time acquisition of three-phase voltage and current signals at each node of the distribution network line;

[0122] Step 2: Calculate the positive sequence, negative sequence, and zero sequence voltage and current components based on the symmetrical component method, and establish a sequence component network model under a single-phase open-circuit ungrounded fault.

[0123] Step 3: Use the sliding time window algorithm to perform dynamic threshold analysis on electrical quantities and set the criteria for sudden changes in electrical quantities;

[0124] Step 4: Construct anti-interference criteria. When a sudden change in electrical quantity occurs, determine whether fault location is triggered by the anti-interference criteria.

[0125] Step 5: When locating the fault, combine topology analysis to determine the faulty section, and control the upstream and downstream switches to isolate the fault and transfer power to the non-faulty section.

[0126] This solution also provides a computer-storable medium having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the following steps:

[0127] Step 1: Real-time acquisition of three-phase voltage and current signals at each node of the distribution network line;

[0128] Step 2: Calculate the positive sequence, negative sequence, and zero sequence voltage and current components based on the symmetrical component method, and establish a sequence component network model under a single-phase open-circuit ungrounded fault.

[0129] Step 3: Use the sliding time window algorithm to perform dynamic threshold analysis on electrical quantities and set the criteria for sudden changes in electrical quantities;

[0130] Step 4: Construct anti-interference criteria. When a sudden change in electrical quantity occurs, determine whether fault location is triggered by the anti-interference criteria.

[0131] Step 5: When locating the fault, combine topology analysis to determine the faulty section, and control the upstream and downstream switches to isolate the fault and transfer power to the non-faulty section.

[0132] The embodiments described above are merely one implementation method of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A centralized FA break location criterion anti-interference method considering noise interference, characterized in that, The method comprises the following steps: Step 1, collecting three-phase voltage and current signals of each node of the power distribution network in real time; Step 2, calculating positive sequence, negative sequence and zero sequence voltage and current components based on the symmetrical component method, and establishing a sequence component network model under single-phase open-line non-grounded fault; Step 3, performing dynamic threshold analysis on the electrical quantities by using a sliding time window algorithm, and setting an electrical quantity mutation criterion; Step 4, constructing an anti-interference criterion, and determining whether to trigger fault location when the electrical quantity mutation occurs through the anti-interference criterion; Step 5, when fault location is performed, determining the fault section in combination with topology analysis, and controlling the upstream and downstream switches to isolate the fault and supply power to the non-fault section.

2. The anti-jamming method of claim 1, wherein, The sequence component network model constructed in step 2 satisfies: The neutral grounding mode provides impedance for zero sequence passage , and satisfies ≤0.1* ; Line-to-ground capacitance Ratio to load impedance ≥ 10 ; rate of voltage amplitude decay downstream of the fault point = ≤ 0.3, wherein is the voltage upstream of the fault point, is the voltage downstream of the fault point.

3. The anti-jamming method of claim 2, wherein, After the sequence component network model is constructed, parameter sensitivity analysis is performed on the sequence component network model to determine the influence degree of the key parameters on the fault characteristics, and the model parameters are optimized and adjusted according to the analysis results.

4. The anti-jamming method of claim 1, wherein, The electrical quantity mutation criterion in the step 3 includes a voltage mutation quantity criterion and a current mutation quantity criterion ; ； ； wherein Vnomis the nominal voltage, Vn is the noise tolerance, and ≤ 5% , Inomis the nominal current, ≤ 8% Vt is the tolerance value, , Kd is the dynamic threshold coefficient.

5. The anti-jamming method of claim 4, wherein, The noise margin The dynamic adjustment process of the dynamic threshold coefficient is: Based on historical data statistics normal operation electrical fluctuation range, determine to take the initial value of noise tolerance ; Wavelet transform is used to process the electrical quantities of the power distribution network system to filter out high-frequency noise components with a frequency higher than a certain threshold; Adaptive correction of noise margin according to grounding mode of power distribution network system including arc suppression coil grounding system margin reduction of 10%, small resistance grounding system margin increase of 5%; The dynamic threshold coefficient , According to the system load rate Adjustment: When the system load ratio is greater than a set first threshold value, the dynamic threshold coefficient , is adaptively increased; When the system load ratio is less than a set second threshold value, the dynamic threshold coefficient , is adaptively reduced.

6. The anti-jamming method of claim 1, wherein, The anti-interference criterion in step 4 is: ； wherein, is the negative / zero sequence voltage-current correlation coefficient, is the corresponding negative / zero sequence voltage is the covariance of the current with the current is the standard deviation of the negative / zero sequence voltage is the standard deviation of the current is the standard deviation of the current is the standard deviation of the current When the negative sequence / zero sequence voltage-current correlation coefficient is greater than or equal to a set threshold value and the duration exceeds a set duration threshold , fault location is triggered.

7. The anti-jamming method of claim 6, wherein, The threshold value The setting rule is: ； wherein, is the initial threshold value and d is the electrical distance of the node to the point of failure.

8. The anti-jamming method of claim 6, wherein, The analysis basis for fault location in step 5 includes: Node directionality criterion: negative sequence / zero sequence voltage-current correlation coefficient of the upstream node of the faulty node decreases, negative sequence / zero sequence voltage-current correlation coefficient of the downstream node of the faulty node increases; Topological constraint: faulty section is located in negative / zero sequence voltage-current correlation coefficient section between the value mutation points and the shortest electrical distance from the power source Communication delay compensation: using Lagrange interpolation method to synchronize the node data whose time scale deviation exceeds 2ms; Prior processing of optical fiber communication node data, and reducing the weight of wireless communication node data by a certain value; In the power distribution network containing distributed power supply: The distributed power injection current needs to be converted into equivalent negative sequence impedance , and satisfies ≥ If the capacity proportion of the distributed power exceeds a certain value, the threshold correspondingly increases.

9. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the computer program to realize the steps of the method of any one of claims 1-8.

10. A computer storable medium having stored thereon a computer program, characterized in that The computer program is executed by the processor to realize the steps of the method of any one of claims 1-8.

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