A distribution network line parameter verification system and method

Abstract

The present invention relates to the field of distribution network line parameter verification, and in particular to a distribution network line parameter verification system and method. The content includes: collecting electrical parameters of each node of the distribution network at different frequencies, and calculating the line impedance according to the electrical parameters; calculating the impedance deviation based on the line impedance, separating the line impedance to obtain the resistance value and inductance value of the line impedance; obtaining the resistance correction factor and the inductance correction factor based on the impedance deviation and the resistance value and inductance value of the line impedance; and obtaining the corrected line impedance based on the line impedance, the resistance correction factor and the inductance correction factor using an adaptive closed-loop feedback correction algorithm. The problem that the complex behavior of each node in the power grid at different frequencies is not fully considered, resulting in insufficient accuracy in line impedance calculation; the influence of environmental factors on the line parameters of the distribution network is not sufficiently considered; the line impedance correction algorithm is not sufficiently adaptable, and lacks a dynamic adjustment and feedback mechanism, resulting in inaccurate correction is solved.

Description

Technical Field

[0001] The present invention relates to the field of distribution network line parameter verification, and in particular to a distribution network line parameter verification system and method. Background Art

[0002] With the continuous development of social economy and the acceleration of urbanization, the demand for electricity has shown a steady growth trend. As an important part of the power system, the distribution network is responsible for transmitting electricity from the high-voltage power grid to the end user. The operation quality of the distribution network is directly related to the safety, stability and economy of the power system. However, with the continuous expansion of the scale of the distribution network, the increasing complexity of the line structure, and the increase in load uncertainty, the traditional distribution network line parameter verification method has been difficult to meet the requirements of the modern distribution network. Therefore, it has become urgent and necessary to develop a distribution network line parameter verification system to improve the verification accuracy of the distribution network line parameters and meet the needs of actual operation.

[0003] The traditional distribution network line parameter verification method has the following technical problems: the electrical parameters based on a single frequency or fixed frequency in a complex distribution network environment fail to fully consider the complex behavior of each node in the power grid at different frequencies, which easily leads to insufficient accuracy in line impedance calculation; the impact of environmental factors on distribution network line parameters is insufficiently considered; the line impedance correction algorithm is not adaptable enough and lacks dynamic adjustment and feedback mechanisms, which easily leads to inaccurate correction, or even over-correction or under-correction, thereby affecting the stability of the entire distribution network line parameters. Summary of the invention

[0004] The present invention provides a distribution network line parameter verification system and method to solve the problem that electrical parameters based on a single frequency or a fixed frequency in a complex distribution network environment fail to fully consider the complex behavior of each node in the power grid at different frequencies, which easily leads to insufficient line impedance calculation accuracy; insufficient consideration of the impact of environmental factors on distribution network line parameters; insufficient adaptability of the line impedance correction algorithm, lack of dynamic adjustment and feedback mechanism, easily leading to inaccurate correction, and even over-correction or under-correction, thereby affecting the stability of the entire distribution network line parameters.

[0005] A distribution network line parameter verification system and method of the present invention specifically include the following technical solutions:

[0006] A method for verifying line parameters of a distribution network comprises the following steps:

[0007] S1: Collect electrical parameters of each node of the distribution network at different frequencies, and calculate the line impedance using the distribution network line impedance calculation algorithm based on the collected electrical parameters;

[0008] S2: Based on the line impedance, the impedance deviation is calculated; based on the impedance deviation, the resistance part and the inductance part of the line impedance are calculated separately to obtain the resistance value and the inductance value of the line impedance;

[0009] S3: Based on the impedance deviation and the resistance value and the inductance value of the line impedance, a resistance correction factor is calculated using a resistance correction algorithm, and an inductance correction factor is calculated using an inductance correction algorithm;

[0010] S4: Based on the line impedance, the resistance correction factor and the inductance correction factor, an adaptive closed-loop feedback correction algorithm is used to calculate the corrected line impedance.

[0011] Preferably, the S1 specifically includes:

[0012] The distribution network line impedance calculation algorithm calculates the line impedance of the node at each frequency based on electrical parameters; the line impedance is obtained by weighted averaging all frequency components and introducing noise and error correction terms.

[0013] Preferably, the S2 specifically includes:

[0014] The impedance deviation is compared with the preset threshold to determine whether the line impedance needs to be corrected; when the impedance deviation is greater than or equal to the preset threshold, the line impedance needs to be corrected, and the resistance part and the inductance part of the line impedance are calculated separately.

[0015] Preferably, the S3 specifically includes:

[0016] In the process of implementing the resistance correction algorithm, the relative deviation of the resistance is obtained based on the resistance value of the line impedance; a nonlinear method is introduced to quantify and correct the comprehensive influence of the impedance deviation and the collected ambient temperature and actual stress on the resistance based on the relative deviation of the resistance, and obtain the resistance correction factor.

[0017] Preferably, the S3 specifically includes:

[0018] In the process of implementing the inductance correction algorithm, the relative deviation of the inductance is obtained based on the inductance value of the line impedance; based on the relative deviation of the inductance, the impedance deviation, the electrical parameters and the acquired external electromagnetic field strength, nonlinear processing is introduced to obtain the inductance correction factor.

[0019] Preferably, the S4 specifically includes:

[0020] The adaptive closed-loop feedback correction algorithm introduces a closed-loop feedback mechanism to adaptively correct the resistance and inductance of the line impedance.

[0021] Preferably, the S4 specifically includes:

[0022] The closed-loop feedback mechanism combines the current line impedance with the resistance correction factor and the inductance correction factor, introduces a convergence coefficient for controlling feedback strength, and dynamically adjusts the line impedance through iterative correction to obtain a corrected line impedance.

[0023] A distribution network line parameter verification system includes the following parts:

[0024] Data acquisition module, line impedance calculation module, line impedance deviation calculation module, verification judgment and line impedance processing module, correction factor calculation module, adaptive closed-loop feedback correction module;

[0025] Data acquisition module: collects electrical parameters of each node of the distribution network at different frequencies, and outputs the electrical parameters to the line impedance calculation module and the correction factor calculation module; measures the ambient temperature, actual stress and external electromagnetic field strength through sensors; outputs the ambient temperature, actual stress and external electromagnetic field strength to the correction factor calculation module;

[0026] Line impedance calculation module: Based on electrical parameters, the line impedance is calculated using the distribution network line impedance calculation algorithm; the line impedance is output to the line impedance deviation calculation module, the verification judgment and line impedance processing module and the adaptive closed-loop feedback correction module;

[0027] Line impedance deviation calculation module: calculates impedance deviation based on line impedance; outputs impedance deviation to the verification judgment and line impedance processing module and correction factor calculation module;

[0028] Verification judgment and line impedance processing module: compare the impedance deviation with the preset threshold value to determine whether the line impedance needs to be corrected; based on the judgment result, further separate and calculate the resistance part and the inductance part of the line impedance to obtain the resistance value and the inductance value of the line impedance; output the resistance value and the inductance value of the line impedance to the correction factor calculation module;

[0029] Correction factor calculation module: Based on the ambient temperature, actual stress, electrical parameters, external electromagnetic field strength, impedance deviation and resistance and inductance values ​​of line impedance, the resistance correction factor is calculated using the resistance correction algorithm, and the inductance correction factor is calculated using the inductance correction algorithm; the resistance correction factor and the inductance correction factor are output to the adaptive closed-loop feedback correction module;

[0030] Adaptive closed-loop feedback correction module: Based on the line impedance, resistance correction factor and inductance correction factor, an adaptive closed-loop feedback correction algorithm is used to calculate the corrected line impedance.

[0031] The beneficial effects of the technical solution of the present invention are:

[0032] 1. By collecting electrical parameters of each node in the distribution network at different frequencies, such as voltage, current and phase angle, combined with the distribution network line impedance calculation algorithm, the line impedance can be accurately calculated. The distribution network line impedance calculation algorithm comprehensively considers the contribution of different frequency components to the line impedance through the weighted average method, and introduces noise and error correction terms to compensate for the deviation caused by measurement errors and noise, which significantly improves the accuracy and reliability of line impedance calculation in complex distribution network environments and ensures the accuracy of distribution network line parameters;

[0033] 2. By calculating the deviation between the line impedance and the theoretical impedance value, and further separating the resistance and inductance parts of the calculated line impedance, it helps to accurately check the actual line parameters of the distribution network. By correcting the deviation, the accuracy of the line impedance is ensured, thereby improving the stability and safety of the distribution network operation;

[0034] 3. The resistance correction algorithm considers the influence of ambient temperature, actual stress and impedance deviation on resistance, and adopts a nonlinear correction method, so that the resistance value of the line impedance can be accurately corrected under different environmental conditions, thereby improving the accuracy of resistance verification and ensuring the reliability of the distribution network under various working conditions;

[0035] 4. The inductance correction algorithm finely adjusts the inductance value of the line impedance, especially considering the influence of the external electromagnetic field strength and the current change rate, so that the inductance part of the line impedance can reflect the actual operation situation and improve the correction accuracy of the inductance value of the line impedance, thereby improving the reliability of the inductance related parameters;

[0036] 5. The adaptive closed-loop feedback correction algorithm can dynamically adjust and gradually approach the actual distribution network line parameter values. Through iterative correction and feedback mechanism control, instability caused by over-correction is avoided, and the accuracy of line impedance verification is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a structural diagram of a distribution network line parameter verification system according to the present invention;

[0038] Figure 2 The present invention is a flow chart of a method for verifying line parameters of a distribution network. DETAILED DESCRIPTION

[0039] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0041] The specific scheme of a distribution network line parameter verification system and method provided by the present invention is described in detail below with reference to the accompanying drawings.

[0042] See attached Figure 1 , which shows a structure diagram of a distribution network line parameter verification system provided by an embodiment of the present invention, the system includes the following parts:

[0043] Data acquisition module, line impedance calculation module, line impedance deviation calculation module, verification judgment and line impedance processing module, correction factor calculation module, adaptive closed-loop feedback correction module;

[0044] Data acquisition module: collects electrical parameters at different frequencies at each node of the distribution network, and outputs the electrical parameters to the line impedance calculation module and the correction factor calculation module; measures the ambient temperature through a temperature sensor, measures the actual stress through a stress sensor, and collects the external electromagnetic field strength through an electromagnetic field sensor; outputs the ambient temperature, actual stress and external electromagnetic field strength to the correction factor calculation module;

[0045] Line impedance calculation module: The line impedance is calculated based on the electrical parameters using the distribution network line impedance calculation algorithm; the line impedance is output to the line impedance deviation calculation module, the verification judgment and line impedance processing module and the adaptive closed-loop feedback correction module;

[0046] Line impedance deviation calculation module: Based on the line impedance and combined with the theoretical impedance value, the impedance deviation is calculated and the impedance deviation is output to the verification judgment and line impedance processing module and the correction factor calculation module;

[0047] Calibration judgment and line impedance processing module: compare the impedance deviation with the preset threshold to determine whether correction is required; if correction is required, separate the resistance part and the inductance part of the line impedance to obtain the resistance value and inductance value of the line impedance; output the resistance value and inductance value of the line impedance to the correction factor calculation module;

[0048] Correction factor calculation module: Based on the ambient temperature, actual stress, electrical parameters, external electromagnetic field strength, impedance deviation and resistance and inductance values ​​of line impedance, the resistance correction factor is calculated using the resistance correction algorithm, and the inductance correction factor is calculated using the inductance correction algorithm; the resistance correction factor and the inductance correction factor are output to the adaptive closed-loop feedback correction module;

[0049] Adaptive closed-loop feedback correction module: Based on the line impedance, resistance correction factor and inductance correction factor, an adaptive closed-loop feedback correction algorithm is used to calculate the corrected line impedance.

[0050] See attached Figure 2 , which shows a flow chart of a method for verifying line parameters of a distribution network provided by an embodiment of the present invention, the method comprising the following steps:

[0051] S1. Collect electrical parameters of each node of the distribution network at different frequencies, and calculate the line impedance using the distribution network line impedance calculation algorithm based on the collected electrical parameters;

[0052] Collect electrical parameters at different frequencies of each node in the distribution network, such as voltage, current, and phase angle; and calculate the line impedance using the distribution network line impedance calculation algorithm based on the collected electrical parameters at different frequencies;

[0053] The distribution network line impedance calculation algorithm extracts electrical parameters at different frequencies in the distribution network, such as voltage, current and phase angle, calculates the line impedance of the node at each frequency, and performs weighted average on all frequency components to reflect the contribution of different frequency components to the line impedance. The influence of noise and measurement error is also considered, and noise and error correction terms are introduced to compensate for the deviation caused by measurement error and noise, aiming to improve the accuracy and reliability of line impedance calculation in a complex distribution network environment.

[0054] The calculation formula of line impedance is:

[0055]

[0056] in, Indicates Nodes at time The line impedance at Indicates Frequency; Indicates Nodes at time Time Frequency The voltage value under Indicates Nodes at time Time Frequency The current value under Indicates Nodes at time Time Frequency The phase angle below; Represents the imaginary part; A complex number representing the phase angle so that the voltage and current can be combined to calculate the complex impedance. Represents the summation symbol, used for Sum the weighted impedance values ​​of the frequency components; Indicates The weight coefficient of the frequency component reflects the The importance of frequency components in line impedance calculations; Represents the sum of the weight coefficients of all frequency components, which is used as a normalization factor to ensure that the line impedance value after weighted average is not affected by the absolute value of the weight; Indicates at time Time noise and error correction term, used to compensate for the deviation caused by measurement error and noise;

[0057] Since the electrical parameters in the distribution network will change with the frequency, the real impedance characteristics of the distribution network line can be fully reflected by measuring at different frequencies. Especially in a complex distribution network environment, the electrical parameters may be affected by noise and measurement errors. The accuracy of line impedance calculation can be improved by weighted averaging and noise and error correction items, providing accurate initial data for subsequent distribution network line parameter verification.

[0058] S2. Calculate impedance deviation based on line impedance; based on the impedance deviation, separately calculate the resistance part and the inductance part of the line impedance to obtain the resistance value and the inductance value of the line impedance;

[0059] According to the line impedance, combined with the theoretical impedance value, the deviation between the line impedance and the theoretical impedance value is calculated. The formula is as follows:

[0060]

[0061] in, Indicates the deviation between the line impedance and the theoretical impedance value, that is, the impedance deviation; Indicates Nodes at time The line impedance at Indicates Nodes at time The theoretical impedance value at the time of the invention can be set according to the specific implementation scenario and is not limited here;

[0062] Compare the impedance deviation with the preset threshold. If the impedance deviation is greater than or equal to the preset threshold, correction is required. If the impedance deviation is less than the preset threshold, normal monitoring continues. The preset threshold can be set according to the specific implementation scenario and is not limited here.

[0063] If correction is required, the resistance part and the inductance part of the line impedance are calculated separately to obtain the resistance value and inductance value of the line impedance to improve the accuracy of the distribution network line parameter verification. The specific calculation formula is as follows:

[0064]

[0065] in, Indicates Nodes at time The resistance part of the line impedance at the time, that is, the resistance value of the line impedance; Indicates Nodes at time The line impedance at Indicates line impedance The real part, i.e. the resistance part;

[0066] in, Indicates Nodes at time The inductance part of the line impedance at that time, that is, the inductance value of the line impedance; Indicates line impedance The imaginary part, i.e. the inductance part; Represents a mathematical constant used to convert the weighted average frequency Convert to angular frequency to match the physical definition of inductance; represents the weighted average frequency, and the calculation formula is:

[0067]

[0068] in, Represents the sum of the weight coefficients of all frequency components, used for the calculation of normalized weighted average frequency; Indicates The weight coefficient of each frequency component; Indicates Frequency;

[0069] Separately calculating the resistance and inductance of the line impedance to obtain the resistance and inductance of the line impedance respectively helps to accurately identify the specific cause of the impedance deviation and provide accurate parameters for subsequent correction steps, playing a role in identifying abnormalities and preparing for correction, ensuring the safety and stability of the distribution network operation;

[0070] S3, based on the impedance deviation and the resistance value and the inductance value of the line impedance, using a resistance correction algorithm to calculate a resistance correction factor, and using an inductance correction algorithm to calculate an inductance correction factor;

[0071] The ambient temperature is measured by a temperature sensor, the actual stress is measured by a stress sensor, and the resistance correction factor is calculated using a resistance correction algorithm in combination with the impedance deviation and the resistance value of the line impedance;

[0072] The resistance correction algorithm adopts a nonlinear method to quantify and correct the comprehensive influence of ambient temperature, actual stress and impedance deviation on resistance; the relative deviation of resistance is obtained by calculating the relative difference between the resistance value of line impedance and the reference resistance value; after determining the relative deviation of resistance, the error caused by impedance deviation is further analyzed, and a correction coefficient is introduced to adjust the influence intensity of impedance deviation on resistance correction factor; in order to improve the correction accuracy, according to the change of ambient temperature, the nonlinear influence of ambient temperature change on resistance is reflected by exponential function, so as to ensure the accuracy of resistance correction under different ambient temperature conditions, and further calculate the influence of actual stress on resistance, and control the nonlinear correction intensity of stress effect by nonlinear correction index, adjust the influence degree of stress on resistance, and ensure that the resistance value of line impedance under different stress conditions can be accurately corrected;

[0073] The resistance correction factor is calculated as:

[0074]

[0075] in, Indicates Nodes at time Resistance correction factor when Indicates the reference resistance value, which can be set according to the specific implementation scenario and is not limited here; Indicates Nodes at time The resistive part of the line impedance when Indicates the relative deviation of resistance and is used to correct the resistance value; A correction factor indicating the intensity of the influence of the adjusted impedance deviation on the resistance correction factor; Indicates the deviation between the line impedance and the theoretical impedance value; It represents the real part of impedance deviation, reflecting the influence of line impedance change on resistance; Represents the temperature effect correction term, which is used to correct the influence of ambient temperature changes on resistance; represents an exponential function, which reflects the nonlinear effect of ambient temperature changes on resistance; Indicates at time The ambient temperature at that time is measured by the temperature sensor; Indicates the reference temperature value, which can be set according to the specific implementation scenario and is not limited here; Indicates the relative change of stress, used to reflect the relative change of actual stress relative to reference stress, affecting the resistance value of line impedance; Indicates at time The actual stress measured is obtained by measuring the stress sensor; Indicates reference stress, which is the stress value set under standard conditions. It can be set according to the specific implementation scenario and is not limited here; It represents the nonlinear correction index for controlling stress effect and adjusting the influence of stress on resistance;

[0076] At the same time, the external electromagnetic field strength is obtained through the electromagnetic field sensor, and the inductance correction factor is calculated using the inductance correction algorithm in combination with the electrical parameters, impedance deviation and inductance value of the line impedance;

[0077] The inductance correction algorithm compares the inductance value of the line impedance with a preset reference inductance value, with the purpose of evaluating the relative deviation between the inductance value of the line impedance and the reference inductance value, which is regarded as the initial basis for correction. The imaginary part of the line impedance is directly related to the physical characteristics of the inductance. A correction coefficient is introduced to adjust the influence of the imaginary part of the impedance deviation on the inductance correction factor. The correction of the imaginary part of the impedance deviation can further improve the accuracy of the inductance value of the line impedance; nonlinear processing is introduced to correct the influence of the external electromagnetic field on the inductance value of the line impedance, so that the influence of the external electromagnetic field on the inductance value of the line impedance is accurately quantified; the inductance correction factor is further finely adjusted in combination with the influence of the current change rate to ensure accurate operation under various dynamic conditions;

[0078] The calculation formula for the inductance correction factor is:

[0079]

[0080] in, Indicates Nodes at time Inductance correction factor at ; Indicates the reference inductance value, which can be set according to the specific implementation scenario and is not limited here; The relative deviation between the inductance value representing the line impedance and the reference inductance value is used to correct the inductance value; A correction factor representing the effect of adjusting the imaginary part of impedance deviation on the inductance correction factor; The imaginary part of the impedance deviation is used to reflect the influence of the imaginary part of the line impedance on the inductance correction; Indicates at time The absolute value of the external electromagnetic field strength at the time φ , reflecting the nonlinear effect of the external electromagnetic field strength on the inductance, and the external electromagnetic field strength can be obtained by an electromagnetic field sensor; A nonlinear correction index that indicates the degree of influence of the external electromagnetic field strength on the inductance; Indicates the current change rate correction factor, which is used to weaken or enhance the effect of the current change rate on the inductance correction factor; Indicates at time The current at Indicates at time The absolute value of the rate of change of current over time reflects the severity of the current change;

[0081] S4, based on the line impedance, the resistance correction factor and the inductance correction factor, using an adaptive closed-loop feedback correction algorithm to calculate the corrected line impedance;

[0082] Based on the line impedance, the resistance correction factor and the inductance correction factor, an adaptive closed-loop feedback correction algorithm is used to calculate the corrected line impedance; the adaptive closed-loop feedback correction algorithm aims to improve the accuracy of the distribution network line parameter verification, and through iterative correction, the resistance and inductance values ​​can be adaptively corrected so that the verification result can finally converge to the real distribution network line parameter value; the current line impedance value is combined with the resistance correction factor and the inductance correction factor through a closed-loop feedback mechanism to obtain the corrected line impedance; the core of the closed-loop feedback mechanism lies in dynamic adjustment, and a convergence coefficient is introduced to control the intensity of feedback after each round of correction, so as to ensure that in the process of gradually approaching the real distribution network line parameter value, the instability of the distribution network line parameter verification system caused by over-correction is avoided, and in each iteration, adjustments are made according to the results of the previous correction, so as to gradually approach the real distribution network line parameter value;

[0083] The calculation formula of the corrected line impedance is:

[0084]

[0085] in, Indicates Nodes at time The line impedance after correction is: Indicates Nodes at time The line impedance at Indicates Nodes at time Resistance correction factor when Indicates Nodes at time Inductance correction factor at ; Represents the imaginary part; represents the convergence coefficient of the control feedback strength to avoid instability during the correction process;

[0086] Through the mechanism of iterative correction and closed-loop feedback, the accuracy and stability of distribution network line parameter verification are improved, ensuring that the distribution network can operate reliably in complex environments.

[0087] In summary, a distribution network line parameter verification system and method are completed.

[0088] The order of the embodiments of the invention is for description only and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0089] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0090] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A method for verifying line parameters of a distribution network, characterized in that: The following steps are involved: S1: Collect electrical parameters of each node of the distribution network at different frequencies, introduce a distribution network line impedance calculation algorithm based on the collected electrical parameters, and calculate the line impedance of the node at each frequency based on the electrical parameters; obtain the line impedance by weighted averaging all frequency components and introducing noise and error correction items; The calculation formula of line impedance is: ， in, Indicates Nodes at time The line impedance at Indicates Frequency; Indicates Nodes at time Time Frequency The voltage value under Indicates Nodes at time Time Frequency The current value under Indicates Nodes at time Time Frequency The phase angle below; Represents the imaginary part; Represents the complex number corresponding to the phase angle; represents the summation symbol; Indicates The weight coefficient of each frequency component; Represents the sum of weight coefficients of all frequency components; Indicates at time Time noise and error correction terms; S2: Based on the line impedance, the impedance deviation is calculated; based on the impedance deviation, the impedance deviation is compared with a preset threshold value to determine whether the line impedance needs to be corrected; when the impedance deviation is greater than or equal to the preset threshold value, the line impedance needs to be corrected, and the resistance part and the inductance part of the line impedance are calculated separately to obtain the resistance value and the inductance value of the line impedance; S3: Based on the impedance deviation and the resistance and inductance values ​​of the line impedance, a resistance correction algorithm is used. In the process of implementing the resistance correction algorithm, the relative deviation of the resistance is obtained based on the resistance value of the line impedance. A nonlinear method is introduced. Based on the relative deviation of the resistance, the comprehensive influence of the impedance deviation and the collected ambient temperature and actual stress on the resistance is quantified and corrected, and the resistance correction factor is calculated. The calculation formula of the resistance correction factor is: ， in, Indicates Nodes at time Resistance correction factor when Indicates the reference resistance value; Indicates Nodes at time The resistive part of the line impedance when Indicates the relative deviation of resistance; A correction factor indicating the intensity of the influence of the adjusted impedance deviation on the resistance correction factor; Indicates the deviation between the line impedance and the theoretical impedance value; represents the real part of the impedance deviation; represents the temperature effect correction term; represents the exponential function; Indicates at time The ambient temperature at Indicates the reference temperature value; Indicates the relative change of stress; Indicates at time The actual stress measured; represents the reference stress; represents the nonlinear correction index for the control stress effect; Using the inductance correction algorithm, in the process of implementing the inductance correction algorithm, the relative deviation of the inductance is obtained based on the inductance value of the line impedance; based on the relative deviation of the inductance, the impedance deviation, the electrical parameters and the acquired external electromagnetic field strength, nonlinear processing is introduced to obtain the inductance correction factor. The calculation formula of the inductance correction factor is: ， in, Indicates Nodes at time Inductance correction factor at ; Indicates the reference inductance value; Indicates Nodes at time The inductive part of the line impedance when Relative deviation between the inductance value representing the line impedance and the reference inductance value; A correction factor representing the effect of adjusting the imaginary part of impedance deviation on the inductance correction factor; Represents the imaginary part of impedance deviation; Indicates at time The absolute value of the external electromagnetic field strength at time ; A nonlinear correction index that indicates the degree of influence of the external electromagnetic field strength on the inductance; Indicates the current change rate correction factor; Indicates at time The current at Indicates at time The absolute value of the rate of change of current with time; S4: Based on the line impedance, the resistance correction factor and the inductance correction factor, an adaptive closed-loop feedback correction algorithm is used to calculate the corrected line impedance.

2. A method for verifying distribution network line parameters according to claim 1, characterized in that: The S4 specifically includes: The adaptive closed-loop feedback correction algorithm introduces a closed-loop feedback mechanism to adaptively correct the resistance and inductance of the line impedance.

3. A method for verifying distribution network line parameters according to claim 2, characterized in that: In said S4, it also includes: The closed-loop feedback mechanism combines the current line impedance with the resistance correction factor and the inductance correction factor, introduces a convergence coefficient for controlling feedback strength, and dynamically adjusts the line impedance through iterative correction to obtain a corrected line impedance.

4. A distribution network line parameter verification system, applied to a distribution network line parameter verification method as claimed in claim 1, characterized in that: Includes the following parts: Data acquisition module, line impedance calculation module, line impedance deviation calculation module, verification judgment and line impedance processing module, correction factor calculation module, adaptive closed-loop feedback correction module; Data acquisition module: collects electrical parameters of each node of the distribution network at different frequencies, and outputs the electrical parameters to the line impedance calculation module and the correction factor calculation module; measures the ambient temperature, actual stress and external electromagnetic field strength through sensors; outputs the ambient temperature, actual stress and external electromagnetic field strength to the correction factor calculation module; Line impedance calculation module: Based on electrical parameters, the line impedance is calculated using the distribution network line impedance calculation algorithm; the line impedance is output to the line impedance deviation calculation module, the verification judgment and line impedance processing module and the adaptive closed-loop feedback correction module; Line impedance deviation calculation module: calculates impedance deviation based on line impedance; outputs impedance deviation to the verification judgment and line impedance processing module and correction factor calculation module; Verification and line impedance processing module: compares the impedance deviation with the preset threshold to determine whether the line impedance needs to be corrected; Based on the judgment result, the resistance part and the inductance part of the line impedance are further calculated separately to obtain the resistance value and the inductance value of the line impedance; the resistance value and the inductance value of the line impedance are output to the correction factor calculation module; Correction factor calculation module: Based on the ambient temperature, actual stress, electrical parameters, external electromagnetic field strength, impedance deviation and resistance and inductance values ​​of line impedance, the resistance correction factor is calculated using the resistance correction algorithm, and the inductance correction factor is calculated using the inductance correction algorithm; the resistance correction factor and the inductance correction factor are output to the adaptive closed-loop feedback correction module; Adaptive closed-loop feedback correction module: Based on the line impedance, resistance correction factor and inductance correction factor, an adaptive closed-loop feedback correction algorithm is used to calculate the corrected line impedance.

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