Line loss analysis method and device based on power decomposition principle, computer equipment, storage medium and computer program product

Abstract

The invention relates to a line loss analysis method and device based on a power decomposition principle, computer equipment, a storage medium and a computer program product. The method comprises the following steps: determining a line loss conversion coefficient of a to-be-analyzed power transmission line according to a fundamental frequency active power value sequence, a fundamental frequency reactive power value sequence, a fundamental frequency unbalanced power value sequence, a harmonic distortion power value sequence and a voltage effective value sequence of the to-be-analyzed power transmission line in a preset measurement period; acquiring a line loss value of the to-be-analyzed power transmission line in a preset measurement period, and determining a line equivalent resistance value of the to-be-analyzed power transmission line according to the line loss value and the line loss conversion coefficient; and based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the voltage effective value sequence and the line equivalent resistance value, obtaining a line loss analysis result of the to-be-analyzed power transmission line. By adopting the method, the line loss analysis accuracy of the power transmission line can be improved.

Description

Technical Field

[0001] This application relates to the field of power grid technology, and in particular to a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for line loss analysis based on the power decomposition principle. Background Technology

[0002] Currently, in order to ensure the operational stability of transmission lines, it is crucial to accurately analyze the line losses of transmission lines.

[0003] In traditional technology, the difference between purchased and sold power is generally used to analyze the line loss of transmission lines. However, this method is difficult to decouple the contributions of each power component, resulting in low accuracy of the line loss analysis. Summary of the Invention

[0004] Therefore, it is necessary to provide a line loss analysis method, device, computer equipment, computer-readable storage medium, and computer program product based on the power decomposition principle that can improve the accuracy of line loss analysis for transmission lines, addressing the aforementioned technical problems.

[0005] Firstly, this application provides a line loss analysis method based on the power decomposition principle, including:

[0006] Acquire the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage RMS value sequence of the transmission line to be analyzed during a preset measurement period;

[0007] The line loss conversion coefficient of the transmission line to be analyzed is determined based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, and the voltage effective value sequence.

[0008] The line loss value of the transmission line to be analyzed is obtained during the preset measurement period, and the equivalent resistance value of the transmission line to be analyzed is determined based on the line loss value and the line loss conversion coefficient.

[0009] Based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the effective voltage value sequence, and the equivalent resistance value of the line, the line loss analysis results of the transmission line to be analyzed are obtained.

[0010] In one embodiment, determining the line loss conversion coefficient of the transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, and the voltage effective value sequence includes:

[0011] Obtain the first square value of the fundamental frequency active power value sequence, the second square value of the fundamental frequency reactive power value sequence, the third square value of the fundamental frequency unbalanced power value sequence, the fourth square value of the harmonic distortion power value sequence, and the fifth square value of the voltage effective value sequence;

[0012] The first square value, the second square value, the third square value, and the fourth square value are added together to obtain the target square value of the transmission line to be analyzed in the preset measurement period.

[0013] Based on the target square value, the first square value, the second square value, the third square value, the fourth square value, and the fifth square value, the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence are determined.

[0014] Based on the bus line loss conversion coefficient, the first line loss conversion coefficient, the second line loss conversion coefficient, the third line loss conversion coefficient, and the fourth line loss conversion coefficient, the line loss conversion coefficient of the transmission line to be analyzed is obtained.

[0015] In one embodiment, determining the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence based on the target square value, the first square value, the second square value, the third square value, the fourth square value, and the fifth square value includes:

[0016] Determine a first ratio between the target square value and the fifth square value, a second ratio between the first square value and the fifth square value, a third ratio between the second square value and the fifth square value, a fourth ratio between the third square value and the fifth square value, and a fifth ratio between the fourth square value and the fifth square value;

[0017] The first ratio, the second ratio, the third ratio, the fourth ratio, and the fifth ratio are integrated according to a preset integration processing period to obtain the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence.

[0018] In one embodiment, obtaining the line loss analysis results of the transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the voltage effective value sequence, and the line equivalent resistance value includes:

[0019] According to the preset integration processing period, the second ratio is integrated, and the product between the integrated second ratio and the line equivalent resistance value is used as the first line loss contribution value of the fundamental frequency active power value sequence.

[0020] According to the preset integration processing period, the third ratio is integrated, and the product between the integrated third ratio and the line equivalent resistance value is used as the second line loss contribution value of the fundamental frequency reactive power value sequence.

[0021] According to the preset integration processing period, the fourth ratio is integrated, and the product between the integrated fourth ratio and the line equivalent resistance value is used as the third line loss contribution value of the fundamental frequency unbalanced power value sequence.

[0022] According to the preset integration processing period, the fifth ratio is integrated, and the product between the integrated fifth ratio and the line equivalent resistance value is used as the fourth line loss contribution value of the harmonic distortion power value sequence.

[0023] Based on the first line loss contribution value, the second line loss contribution value, the third line loss contribution value, and the fourth line loss contribution value, the line loss analysis result of the transmission line to be analyzed is obtained.

[0024] In one embodiment, determining the equivalent resistance value of the transmission line to be analyzed based on the line loss value and the line loss conversion coefficient includes:

[0025] When the line loss conversion factor represents the bus loss conversion factor of a user's transmission line, the line equivalent resistance value of the user's transmission line is obtained based on the ratio between the line loss value and the bus loss conversion factor of the user's transmission line, and is used as the line equivalent resistance value of the transmission line to be analyzed.

[0026] When the line loss conversion coefficient represents the total line loss conversion coefficient of multiple user transmission lines, an estimation algorithm is used to estimate the line loss value and the total line loss conversion coefficient of each user transmission line to obtain the sub-line equivalent resistance value of each user transmission line, which is used as the line equivalent resistance value of the transmission line to be analyzed.

[0027] In one embodiment, the estimation algorithm is used to estimate the line loss value and the total bus loss conversion coefficient of each user's transmission line to obtain the equivalent resistance value of the sub-line of each user's transmission line, including:

[0028] Based on the line loss value and the total line loss conversion coefficient of each user's transmission line, a system of multiple linear equations is constructed;

[0029] The system of linear equations is solved using the least squares method or the robust weighted least squares method to obtain the equivalent resistance value of the sub-line of each user's transmission line.

[0030] In one embodiment, acquiring the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage RMS value sequence of the transmission line to be analyzed during a preset measurement period includes:

[0031] Obtain the three-phase voltage value sequence and the three-phase current value sequence of the transmission line to be analyzed during the preset measurement period;

[0032] Frequency domain decomposition is performed on the three-phase voltage value sequence and the three-phase current value sequence respectively to obtain the fundamental voltage value and harmonic voltage value of the transmission line to be analyzed, as well as the fundamental current value and harmonic current value of the transmission line to be analyzed.

[0033] The fundamental voltage value and the fundamental current value are respectively subjected to component decomposition processing to obtain the positive sequence voltage component, negative sequence voltage component and zero sequence voltage component of the transmission line to be analyzed, as well as the positive sequence current component, negative sequence current component and zero sequence current component of the transmission line to be analyzed.

[0034] Based on the positive sequence voltage component and the positive sequence current component, the fundamental frequency active power value sequence and the fundamental frequency reactive power value sequence are determined. Based on the negative sequence voltage component, the zero sequence voltage component, the negative sequence current component, and the zero sequence current component, the fundamental frequency unbalanced power value sequence is determined. Based on the harmonic voltage value and the harmonic current value, the harmonic distortion power value sequence is determined.

[0035] In one embodiment, the step of performing frequency domain decomposition processing on the three-phase voltage value sequence and the three-phase current value sequence to obtain the fundamental voltage value and harmonic voltage value of the transmission line to be analyzed, as well as the fundamental current value and harmonic current value of the transmission line to be analyzed, includes:

[0036] The three-phase voltage value sequence and the three-phase current value sequence are frequency domain decomposed using either the Fast Fourier Transform method or the wavelet packet decomposition method to obtain the fundamental voltage value and harmonic voltage value of the transmission line to be analyzed, as well as the fundamental current value and harmonic current value of the transmission line to be analyzed.

[0037] Secondly, this application also provides a line loss analysis device based on the power decomposition principle, comprising:

[0038] The data acquisition module is used to acquire the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage effective value sequence of the transmission line to be analyzed during a preset measurement period.

[0039] The coefficient determination module is used to determine the line loss conversion coefficient of the transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, and the voltage effective value sequence.

[0040] The resistance determination module is used to obtain the line loss value of the transmission line to be analyzed during the preset measurement period, and determine the equivalent resistance value of the transmission line to be analyzed based on the line loss value and the line loss conversion coefficient.

[0041] The result determination module is used to obtain the line loss analysis results of the transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the voltage effective value sequence, and the line equivalent resistance value.

[0042] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0043] Acquire the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage RMS value sequence of the transmission line to be analyzed during a preset measurement period;

[0044] The line loss conversion coefficient of the transmission line to be analyzed is determined based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, and the voltage effective value sequence.

[0045] The line loss value of the transmission line to be analyzed is obtained during the preset measurement period, and the equivalent resistance value of the transmission line to be analyzed is determined based on the line loss value and the line loss conversion coefficient.

[0046] Based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the effective voltage value sequence, and the equivalent resistance value of the line, the line loss analysis results of the transmission line to be analyzed are obtained.

[0047] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0048] Acquire the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage RMS value sequence of the transmission line to be analyzed during a preset measurement period;

[0049] The line loss conversion coefficient of the transmission line to be analyzed is determined based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, and the voltage effective value sequence.

[0050] The line loss value of the transmission line to be analyzed is obtained during the preset measurement period, and the equivalent resistance value of the transmission line to be analyzed is determined based on the line loss value and the line loss conversion coefficient.

[0051] Based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the effective voltage value sequence, and the equivalent resistance value of the line, the line loss analysis results of the transmission line to be analyzed are obtained.

[0052] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0053] Acquire the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage RMS value sequence of the transmission line to be analyzed during a preset measurement period;

[0054] The line loss conversion coefficient of the transmission line to be analyzed is determined based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, and the voltage effective value sequence.

[0055] The line loss value of the transmission line to be analyzed is obtained during the preset measurement period, and the equivalent resistance value of the transmission line to be analyzed is determined based on the line loss value and the line loss conversion coefficient.

[0056] Based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the effective voltage value sequence, and the equivalent resistance value of the line, the line loss analysis results of the transmission line to be analyzed are obtained.

[0057] The aforementioned line loss analysis method, apparatus, computer equipment, storage medium, and computer program product based on the power decomposition principle first acquires the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage RMS value sequence of the transmission line to be analyzed during a preset measurement period. Then, based on these sequences, the line loss conversion coefficient of the transmission line to be analyzed is determined. Next, the line loss value of the transmission line to be analyzed during the preset measurement period is acquired. Based on the line loss value and the line loss conversion coefficient, the equivalent resistance value of the transmission line to be analyzed is determined. Finally, based on the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, voltage RMS value sequence, and equivalent resistance value, the line loss analysis result of the transmission line to be analyzed is obtained. In this way, when analyzing line losses of transmission lines, a multi-dimensional electrical quantity sequence, including fundamental frequency active power, fundamental frequency reactive power, fundamental frequency unbalanced power, harmonic distortion power, and voltage RMS value, is simultaneously collected and comprehensively utilized within a preset measurement period of the transmission line. This allows for the accurate construction of a line loss conversion coefficient that comprehensively reflects the actual operating conditions and power characteristics of the line. Then, the equivalent resistance of the line, which closely matches the actual operating state, is calculated by combining the measured line loss value, rather than estimating using fixed parameters or a single power component. Finally, line loss calculation and analysis are carried out based on the complete electrical quantity sequence, measurement period, and equivalent resistance. This effectively eliminates the influence of non-fundamental frequency components such as unbalanced power and harmonic distortion power, as well as voltage fluctuations and changes in operating conditions, on the results of traditional line loss analysis, thus improving the accuracy of line loss analysis for transmission lines. Attached Figure Description

[0058] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0059] Figure 1 This is a flowchart illustrating a line loss analysis method based on the power decomposition principle in one embodiment.

[0060] Figure 2This is a flowchart illustrating the steps for determining the line loss conversion coefficient of the transmission line to be analyzed in one embodiment.

[0061] Figure 3 This is a flowchart illustrating a line loss analysis method based on the power decomposition principle in another embodiment;

[0062] Figure 4 This is a schematic diagram of a power tree in one embodiment;

[0063] Figure 5 This is a structural block diagram of a line loss analysis device based on the power decomposition principle in one embodiment;

[0064] Figure 6 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0066] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0067] In one exemplary embodiment, such as Figure 1 As shown, a line loss analysis method based on the power decomposition principle is provided. This embodiment illustrates the application of this method to a server; it is understood that this method can also be applied to terminals, and to systems including terminals and servers, and is implemented through interaction between the terminals and servers. The terminal can be, but is not limited to, various personal computers, laptops, smartphones, and tablets; the server can be a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services. In this embodiment, the method includes the following steps:

[0068] Step S101: Obtain the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage effective value sequence of the transmission line to be analyzed during the preset measurement period.

[0069] Among them, the transmission line to be analyzed refers to the transmission line that needs to undergo line loss component analysis.

[0070] The preset measurement cycle refers to the time interval set in advance for continuously collecting electrical quantities of the transmission line to be analyzed.

[0071] Among them, the fundamental frequency active power value sequence refers to the data sequence formed by arranging the active power generated by the fundamental frequency component according to the sampling time sequence.

[0072] Among them, the fundamental frequency reactive power value sequence refers to the data sequence formed by arranging the reactive power generated by the fundamental frequency component according to the sampling time sequence.

[0073] Among them, the fundamental frequency unbalanced power value sequence refers to the data sequence formed by arranging the power generated by the imbalance of three-phase fundamental frequency electrical quantities according to the sampling time sequence.

[0074] Among them, the harmonic distortion power value sequence refers to the data sequence formed by arranging the distortion power generated by the interaction between each harmonic component and the fundamental frequency component according to the sampling time sequence.

[0075] Among them, the voltage RMS value sequence refers to the data sequence formed by arranging the voltage RMS values ​​according to the sampling time sequence.

[0076] For example, the server uses synchronous acquisition devices deployed at preset monitoring points on the transmission line to be analyzed to continuously and synchronously sample the three-phase voltage and three-phase current signals of the transmission line to be analyzed at a preset sampling frequency, obtaining the voltage sampling sequence and current sampling sequence corresponding to the preset measurement period; the voltage sampling sequence and current sampling sequence are then subjected to filtering and noise reduction, synchronous phase correction, and abnormal data removal processing in sequence to obtain the processed voltage sampling sequence and processed current sampling sequence; based on the processed voltage sampling sequence and processed current sampling sequence, a fast Fourier transform or small... Waveform transformation separates the fundamental frequency component and each harmonic component, and calculates the fundamental frequency active power, fundamental frequency reactive power, fundamental frequency unbalanced power and harmonic distortion power corresponding to each sampling moment. The values ​​corresponding to each sampling moment are arranged in chronological order to form the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence and harmonic distortion power value sequence of the transmission line to be analyzed in the preset measurement period. At the same time, the effective voltage value is calculated point by point according to the processed voltage sampling sequence, and arranged in chronological order to form the effective voltage value sequence of the transmission line to be analyzed in the preset measurement period.

[0077] Step S102: Determine the line loss conversion coefficient of the transmission line to be analyzed based on the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage effective value sequence.

[0078] Among them, the line loss conversion coefficient is a characteristic coefficient used to represent the quantitative mapping relationship between the actual operating power component and the line loss of the transmission line to be analyzed.

[0079] For example, the server inputs the base frequency active power value sequence, base frequency reactive power value sequence, base frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage effective value sequence into multiple trained line loss conversion coefficient prediction models to obtain the predicted line loss conversion coefficient of the transmission line to be analyzed output by each trained line loss conversion coefficient prediction model; then, according to the model weight of each trained line loss conversion coefficient prediction model, the predicted line loss conversion coefficients of the transmission line to be analyzed are summed to obtain the line loss conversion coefficient of the transmission line to be analyzed.

[0080] Step S103: Obtain the line loss value of the transmission line to be analyzed during the preset measurement period, and determine the equivalent resistance value of the transmission line to be analyzed based on the line loss value and the line loss conversion coefficient.

[0081] Among them, the line loss value refers to the active power loss value generated by the transmission line to be analyzed during operation.

[0082] The equivalent resistance value of the line refers to the parameter that characterizes the equivalent resistance characteristics of the transmission line to be analyzed.

[0083] For example, the server uses energy metering devices deployed at the beginning and end of the transmission line to be analyzed to collect the input and output energy values ​​of the transmission line to be analyzed within a preset measurement period. The difference between the input and output energy values ​​is used to obtain the line loss value of the transmission line to be analyzed within the preset measurement period. Then, using the line loss conversion coefficient as the mapping weight between the power component and the line loss under the actual operating conditions of the line, a mapping calculation model between the line loss value, the line loss conversion coefficient and the equivalent resistance of the line is established. The line loss value is substituted into the mapping calculation model, and the loss component is normalized and fitted by combining the line loss conversion coefficient. The loss deviation caused by three-phase imbalance, harmonic distortion and voltage fluctuation is eliminated. The equivalent resistance value of the transmission line to be analyzed is obtained by numerical solution or least squares fitting.

[0084] Step S104: Based on the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, voltage effective value sequence, and line equivalent resistance value, the line loss analysis results of the transmission line to be analyzed are obtained.

[0085] Among them, the line loss analysis results are used to represent the quantitative analysis results of the line loss level, loss composition and loss distribution characteristics of the transmission line to be analyzed.

[0086] For example, the server calculates the contribution ratio of active power loss, reactive power loss, unbalanced power loss and harmonic distortion loss of the transmission line to be analyzed based on the base frequency active power value sequence, base frequency reactive power value sequence, base frequency unbalanced power value sequence, harmonic distortion power value sequence, voltage effective value sequence and line equivalent resistance value, respectively, and uses it as the line loss analysis result of the transmission line to be analyzed.

[0087] In the aforementioned line loss analysis method based on the power decomposition principle, the following steps are taken: First, the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage RMS value sequence of the transmission line to be analyzed are obtained during a preset measurement period. Then, based on these sequences, the line loss conversion coefficient of the transmission line to be analyzed is determined. Next, the line loss value of the transmission line to be analyzed during the preset measurement period is obtained. Based on the line loss value and the line loss conversion coefficient, the equivalent resistance value of the transmission line to be analyzed is determined. Finally, based on the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, voltage RMS value sequence, and equivalent resistance value, the line loss analysis result of the transmission line to be analyzed is obtained. In this way, when analyzing line losses of transmission lines, a multi-dimensional electrical quantity sequence, including fundamental frequency active power, fundamental frequency reactive power, fundamental frequency unbalanced power, harmonic distortion power, and voltage RMS value, is simultaneously collected and comprehensively utilized within a preset measurement period of the transmission line. This allows for the accurate construction of a line loss conversion coefficient that comprehensively reflects the actual operating conditions and power characteristics of the line. Then, the equivalent resistance of the line, which closely matches the actual operating state, is calculated by combining the measured line loss value, rather than estimating using fixed parameters or a single power component. Finally, line loss calculation and analysis are carried out based on the complete electrical quantity sequence, measurement period, and equivalent resistance. This effectively eliminates the influence of non-fundamental frequency components such as unbalanced power and harmonic distortion power, as well as voltage fluctuations and changes in operating conditions, on the results of traditional line loss analysis, thus improving the accuracy of line loss analysis for transmission lines.

[0088] In one exemplary embodiment, such as Figure 2 As shown, step S102 above, based on the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage effective value sequence, determines the line loss conversion coefficient of the transmission line to be analyzed, specifically including the following steps:

[0089] Step S201: Obtain the first square value of the fundamental frequency active power value sequence, the second square value of the fundamental frequency reactive power value sequence, the third square value of the fundamental frequency unbalanced power value sequence, the fourth square value of the harmonic distortion power value sequence, and the fifth square value of the voltage effective value sequence.

[0090] Step S202: Add the first square value, the second square value, the third square value and the fourth square value to obtain the target square value of the transmission line to be analyzed in the preset measurement period.

[0091] Step S203: Based on the target square value, the first square value, the second square value, the third square value, the fourth square value, and the fifth square value, determine the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence.

[0092] Step S204: Based on the bus line loss conversion coefficient, the first line loss conversion coefficient, the second line loss conversion coefficient, the third line loss conversion coefficient, and the fourth line loss conversion coefficient, the line loss conversion coefficient of the transmission line to be analyzed is obtained.

[0093] The first squared value refers to the squared value of the fundamental frequency active power value sequence.

[0094] The second square value refers to the square of the fundamental frequency reactive power value sequence.

[0095] The third square value refers to the square of the fundamental frequency unbalanced power value sequence.

[0096] The fourth square value refers to the square of the harmonic distortion power value sequence.

[0097] The fifth square value refers to the square of the effective voltage value sequence.

[0098] The target square value is the arithmetic sum of the first, second, third, fourth, and fifth square values.

[0099] Among them, the bus loss conversion coefficient is a comprehensive coefficient constructed based on the target square value and the fifth square value, used to characterize the overall mapping relationship between the total power component and the total loss of the transmission line to be analyzed.

[0100] The first line loss conversion coefficient is a quantification coefficient determined based on the first squared value and the fifth squared value, used to characterize the contribution of the fundamental frequency active power component to line loss.

[0101] The second line loss conversion coefficient is a quantification coefficient determined based on the second squared value and the fifth squared value, used to characterize the contribution of the fundamental frequency reactive power component to line loss.

[0102] The third line loss conversion factor is a quantification factor determined based on the third squared value and the fifth squared value, used to characterize the contribution of the unbalanced power component of the fundamental frequency to the line loss.

[0103] The fourth line loss conversion factor is a quantitative coefficient determined based on the fourth square value and the fifth square value, used to characterize the contribution of harmonic distortion power components to line loss.

[0104] For example, the server obtains the squares of the power values ​​corresponding to each sampling time in the fundamental frequency active power value sequence and arranges them in time sequence to obtain the first square value of the fundamental frequency active power value sequence; obtains the squares of the power values ​​corresponding to each sampling time in the fundamental frequency reactive power value sequence and arranges them in time sequence to obtain the second square value of the fundamental frequency reactive power value sequence; obtains the squares of the power values ​​corresponding to each sampling time in the fundamental frequency unbalanced power value sequence and arranges them in time sequence to obtain the third square value of the fundamental frequency unbalanced power value sequence; obtains the squares of the power values ​​corresponding to each sampling time in the harmonic distortion power value sequence and arranges them in time sequence to obtain the fourth square value of the harmonic distortion power value sequence; obtains the squares of the voltage RMS value corresponding to each sampling time in the voltage RMS value sequence and arranges them in time sequence to obtain the fifth square value of the voltage RMS value sequence; then, the first square value, the second square value, and the third square value are processed by the server. The first, second, third, fourth, and fifth squared values ​​are added point by point at the same sampling time to obtain the target squared value corresponding to each sampling time of the transmission line under analysis within the preset measurement period. Then, the target squared value, the first squared value, the second squared value, the third squared value, the fourth squared value, and the fifth squared value are normalized and weighted to obtain the line loss conversion coefficient of the transmission line under analysis, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence. Finally, the line loss conversion coefficient, the first line loss conversion coefficient, the second line loss conversion coefficient, the third line loss conversion coefficient, and the fourth line loss conversion coefficient are used as the line loss conversion coefficient of the transmission line under analysis.

[0105] For example, the target square value is calculated using the following formula:

[0106] Equation (1)

[0107] in, This refers to the target square value. This refers to the first square value. It refers to the second square value. It refers to the third square value. It refers to the fourth square value. It refers to the sequence of fundamental frequency active power values. This refers to the fundamental frequency reactive power value sequence. This refers to the fundamental frequency unbalanced power value sequence. It refers to the sequence of harmonic distortion power values.

[0108] In this embodiment, by realizing the quantitative fusion of all-dimensional losses under fundamental frequency and harmonic, balanced and unbalanced operating conditions, the limitation of traditional line loss analysis focusing only on fundamental active power loss is broken. By integrating multiple types of loss characteristics through the target square value, the line loss conversion coefficient can more comprehensively and accurately reflect the actual operating loss characteristics of the line, and greatly improve the accuracy and reliability of line loss assessment.

[0109] In an exemplary embodiment, step S203 above, based on the target square value, the first square value, the second square value, the third square value, the fourth square value, and the fifth square value, determines the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence. Specifically, this includes determining the first ratio between the target square value and the fifth square value, the second ratio between the first square value and the fifth square value, and the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence. The ratios, the third ratio between the second and fifth squared values, the fourth ratio between the third and fifth squared values, and the fifth ratio between the fourth and fifth squared values ​​are integrated according to a preset integration processing period to obtain the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence.

[0110] The first ratio refers to the ratio of the target square value to the fifth square value.

[0111] The second ratio refers to the ratio of the first squared value to the fifth squared value.

[0112] The third ratio refers to the ratio of the second square value to the fifth square value.

[0113] The fourth ratio refers to the ratio of the third square value to the fifth square value.

[0114] The fifth ratio refers to the ratio of the fourth square value to the fifth square value.

[0115] The preset integration processing period refers to the time interval (such as 15 min, 1 hour, 1 day, 1 month) that is pre-set for performing time integration operations on each ratio sequence.

[0116] For example, the server performs a division operation on the target squared value and the fifth squared value at each sampling time to determine a first ratio between the target squared value and the fifth squared value of the transmission line to be analyzed at that sampling time; performs a division operation on the first squared value and the fifth squared value to determine a second ratio between the first squared value and the fifth squared value at the corresponding sampling time; performs a division operation on the second squared value and the fifth squared value to determine a third ratio between the second squared value and the fifth squared value at the corresponding sampling time; performs a division operation on the third squared value and the fifth squared value to determine a fourth ratio between the third squared value and the fifth squared value at the corresponding sampling time; and performs a division operation on the fourth squared value and the fifth squared value... The values ​​are divided to determine the fifth ratio between the fourth squared value and the fifth squared value at the corresponding sampling time. Then, according to the preset integration processing period, the first ratio, the second ratio, the third ratio, the fourth ratio, and the fifth ratio are integrated in the time dimension. Through integration, the cumulative average and smoothing of each ratio over the entire measurement period are achieved, resulting in the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient corresponding to the fundamental frequency active power value sequence, the second line loss conversion coefficient corresponding to the fundamental frequency reactive power value sequence, the third line loss conversion coefficient corresponding to the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient corresponding to the harmonic distortion power value sequence.

[0117] For example, the line loss conversion factor can be calculated using the following formula:

[0118] Equation (2)

[0119] in, This refers to the line loss conversion factor. It refers to the root mean square value of the acquired voltage RMS value sequence, and its square... It is the sum of squares of the sequence of effective voltage values ​​obtained from the data acquisition.

[0120] In this embodiment, by simplifying the calculation logic of the line loss conversion coefficient, the line loss conversion coefficient can be quickly determined by the ratio without the need for complex operating condition corrections. This significantly reduces the computational complexity of line loss assessment and the difficulty of engineering implementation, and provides an efficient and reliable quantitative basis for the refined management of line losses, loss attribution analysis and energy-saving optimization of transmission lines.

[0121] In an exemplary embodiment, step S104 above, based on the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, voltage effective value sequence, and line equivalent resistance value, obtains the line loss analysis result of the transmission line to be analyzed, specifically including the following: Integrating the second ratio according to a preset integration processing period, and using the product of the integrated second ratio and the line equivalent resistance value as the first line loss contribution value of the fundamental frequency active power value sequence; Integrating the third ratio according to a preset integration processing period, and using the product of the integrated third ratio and the line equivalent resistance value... The product of the values ​​is used as the second line loss contribution value of the fundamental frequency reactive power value sequence; the fourth ratio is integrated according to the preset integration processing period, and the product of the integrated fourth ratio and the line equivalent resistance value is used as the third line loss contribution value of the fundamental frequency unbalanced power value sequence; the fifth ratio is integrated according to the preset integration processing period, and the product of the integrated fifth ratio and the line equivalent resistance value is used as the fourth line loss contribution value of the harmonic distortion power value sequence; based on the first line loss contribution value, the second line loss contribution value, the third line loss contribution value, and the fourth line loss contribution value, the line loss analysis result of the transmission line to be analyzed is obtained.

[0122] The first line loss contribution value is used to represent the quantized contribution of the fundamental frequency active power value sequence to the line loss value.

[0123] The second line loss contribution value is used to represent the quantized contribution of the fundamental frequency reactive power value sequence to the line loss value.

[0124] The third line loss contribution value is used to represent the quantized contribution of the fundamental frequency unbalanced power value sequence to the line loss value.

[0125] The fourth line loss contribution value is used to represent the quantitative contribution of the harmonic distortion power value sequence to the line loss value.

[0126] For example, the server integrates the second ratio in the time dimension according to a preset integration processing period to obtain the integrated second ratio; multiplies the integrated second ratio by the equivalent resistance value of the line, and uses the product as the first line loss contribution value of the fundamental frequency active power value sequence to the line loss; integrates the third ratio in the time dimension according to the preset integration processing period to obtain the integrated third ratio; multiplies the integrated third ratio by the equivalent resistance value of the line, and uses the product as the second line loss contribution value of the fundamental frequency reactive power value sequence to the line loss; integrates the fourth ratio in the time dimension according to the preset integration processing period to obtain the integrated fourth ratio; multiplies the integrated fourth ratio by the equivalent resistance value of the line, and uses the product as the second line loss contribution value of the fundamental frequency reactive power value sequence to the line loss; and integrates the fourth ratio in the time dimension according to the preset integration processing period to obtain the integrated fourth ratio; multiplies the integrated fourth ratio by the equivalent resistance value of the line, and uses the product as the second line loss contribution value of the fundamental frequency reactive power value sequence to the line loss. The result is used as the third line loss contribution value of the fundamental frequency unbalanced power value sequence to the line loss; according to the preset integration processing period, the fifth ratio is integrated in the time dimension to obtain the integrated fifth ratio; the integrated fifth ratio is multiplied by the equivalent resistance value of the line, and the product is used as the fourth line loss contribution value of the harmonic distortion power value sequence to the line loss; based on the first line loss contribution value, the second line loss contribution value, the third line loss contribution value, and the fourth line loss contribution value, statistics, superposition, and component decomposition are performed to obtain the total loss value, fundamental frequency active power loss value, fundamental frequency reactive power loss value, fundamental frequency unbalanced loss value, harmonic distortion loss value, the proportion of each loss component, and the line loss rate of the transmission line under analysis within the preset measurement period, which are used as the line loss analysis results of the transmission line under analysis.

[0127] In this embodiment, by accurately quantifying the line loss contribution values ​​corresponding to each component of active power, reactive power, imbalance, and harmonics, the full-dimensional attribution and quantitative decomposition of transmission line losses are realized. This breaks through the limitation of traditional line loss analysis, which only focuses on fundamental active power loss, and provides a quantitative basis for line loss control, energy saving and loss reduction, and equipment selection.

[0128] In an exemplary embodiment, step S103, which determines the equivalent resistance value of the transmission line to be analyzed based on the line loss value and the line loss conversion coefficient, specifically includes the following: when the line loss conversion coefficient represents the bus loss conversion coefficient of a user transmission line, the equivalent resistance value of a user transmission line is obtained based on the ratio between the line loss value and the bus loss conversion coefficient of a user transmission line, and is used as the equivalent resistance value of the transmission line to be analyzed; when the line loss conversion coefficient represents the bus loss conversion coefficient of multiple user transmission lines, an estimation algorithm is used to estimate the line loss value and the bus loss conversion coefficient of each user transmission line to obtain the equivalent resistance value of the sub-line of each user transmission line, which is used as the equivalent resistance value of the transmission line to be analyzed.

[0129] In this context, "one user transmission line" indicates that there is only one user transmission line among the transmission lines to be analyzed.

[0130] Among them, multiple user transmission lines indicate that the transmission lines to be analyzed include two or more user transmission lines.

[0131] Among them, the equivalent resistance value of a sub-line refers to the equivalent resistance value of each user transmission line obtained through estimation processing in the scenario of multiple user transmission lines.

[0132] Among them, the estimation algorithm refers to the calculation method for allocating, fitting or solving the equivalent resistance of each sub-line based on the line loss value and the bus loss conversion coefficient of each line in a multi-line scenario, including but not limited to the least squares method, the weighted average method, the iterative solution method and the robust weighted least squares method.

[0133] For example, the equivalent resistance of a line can be calculated using the following formula:

[0134] Equation (3)

[0135] in, This refers to the equivalent resistance value of the line. "M" refers to the line loss value, and "M" refers to the line loss conversion factor.

[0136] In this embodiment, by adopting differentiated methods for solving the equivalent resistance of the line for different user transmission line scenarios corresponding to the line loss conversion coefficient, the line loss analysis needs of different power supply scenarios can be fully covered, ensuring the pertinence and accuracy of the solution of the equivalent resistance of the line, and thus providing reliable basic parameters for subsequent decomposition of line loss components and analysis of loss ratio.

[0137] In an exemplary embodiment, an estimation algorithm is used to estimate the line loss value and the bus loss conversion coefficient of each user's transmission line to obtain the equivalent resistance value of the sub-line of each user's transmission line. Specifically, this includes the following: constructing a system of linear equations with multiple variables based on the line loss value and the bus loss conversion coefficient of each user's transmission line; solving the system of linear equations with multiple variables using the least squares method or the robust weighted least squares method to obtain the equivalent resistance value of the sub-line of each user's transmission line.

[0138] For example, the server establishes a system of multiple linear equations with the equivalent resistance of the sub-line of each user's transmission line as the unknown quantity, based on the bus line loss value to be analyzed and the bus loss conversion coefficient corresponding to each user's transmission line. During the solution process, depending on the disturbance of the actual operating data, the server selects to use the least squares method for fitting and solving, or the robust weighted least squares method for anti-interference solution. Through iterative optimization, the influence of measurement errors, abnormal data, and load fluctuations on the solution results is eliminated, and the equivalent resistance value of the sub-line of each user's transmission line is obtained.

[0139] For example, using the equivalent resistance of each user's transmission line sub-line as an unknown parameter, a system of linear equations is constructed based on the measured line loss values ​​within different statistical periods and the corresponding total line loss conversion coefficients for each user's line. If there are 3 users, then one line loss equation can be constructed for a single statistical period (such as a calendar month). = When the number of statistical periods used is equal to the number of users, the analytical solution of the equivalent resistance of each sub-line can be obtained by directly solving the system of linear equations. When the number of statistical periods used is greater than the number of users, the system of equations is overdetermined. In this case, the least squares method or robust weighted least squares method is used to solve the system and obtain the optimal estimated solution of the equivalent resistance of each sub-line. This enables high-precision solution of equivalent resistance in multi-period, multi-user line scenarios and improves the stability and reliability of parameter identification.

[0140] In this embodiment, a system of multiple linear equations is constructed based on the line loss value and the total line loss conversion coefficient of each user's transmission line. The least squares method or robust weighted least squares method is used to solve the equations. This enables the accurate decomposition and quantitative calculation of the equivalent resistance of each sub-line in a multi-user, multi-line shared scenario, which is beneficial to improving the stability and reliability of the equivalent resistance solution.

[0141] In an exemplary embodiment, step S101, which involves obtaining the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage effective value sequence of the transmission line to be analyzed during a preset measurement period, specifically includes the following: obtaining the three-phase voltage value sequence and three-phase current value sequence of the transmission line to be analyzed during the preset measurement period; performing frequency domain decomposition processing on the three-phase voltage value sequence and the three-phase current value sequence respectively to obtain the fundamental voltage value and harmonic voltage value of the transmission line to be analyzed, as well as the fundamental current value and harmonic current value of the transmission line to be analyzed. The fundamental voltage and current values ​​are decomposed into components to obtain the positive-sequence voltage, negative-sequence voltage, and zero-sequence voltage components, as well as the positive-sequence current, negative-sequence current, and zero-sequence current components of the transmission line to be analyzed. Based on the positive-sequence voltage and current components, the fundamental frequency active power and reactive power value sequences are determined. Based on the negative-sequence voltage, zero-sequence voltage, negative-sequence current, and zero-sequence current components, the fundamental frequency unbalanced power value sequence is determined. Based on the harmonic voltage and harmonic current values, the harmonic distortion power value sequence is determined.

[0142] Among them, the three-phase voltage value sequence refers to the data sequence formed by arranging the instantaneous voltage values ​​of the three phases A, B, and C of the transmission line to be analyzed in the sampling time sequence at the preset sampling time.

[0143] Among them, the three-phase current value sequence refers to the data sequence formed by arranging the instantaneous current values ​​of the three phases A, B, and C of the transmission line to be analyzed in the sampling time sequence at the preset sampling time.

[0144] Frequency domain decomposition refers to the process of using Fourier transform to convert the three-phase voltage and current sampling signals in the time domain to the frequency domain and then separating them according to frequency components.

[0145] The fundamental voltage value refers to the voltage component of the three-phase voltage value that is within the rated power frequency range (50Hz or 60Hz), which corresponds to the vector sum of the fundamental positive sequence, negative sequence, and zero sequence voltages, respectively.

[0146] Among them, harmonic voltage value refers to the set of voltage components in the three-phase voltage value whose frequency is higher than the rated power frequency and is an integer multiple of it, including characteristic harmonics such as the 3rd, 5th, and 7th harmonics and interharmonics.

[0147] The fundamental current value refers to the current component in the three-phase current value that is within the rated power frequency range, corresponding to the vector sum of the fundamental positive sequence, negative sequence, and zero sequence currents.

[0148] Among them, harmonic current value refers to the set of current components in the three-phase current value whose frequency is higher than the rated power frequency and is an integer multiple of it.

[0149] Among them, component decomposition processing refers to the process of transforming the fundamental voltage value and the fundamental current value using the Fortescue (symmetric component method).

[0150] Among them, the positive sequence voltage component refers to the symmetrical voltage component whose phase differs by 120° and whose phase sequence is consistent with the positive sequence of the system after the fundamental voltage value is decomposed by the symmetrical component method.

[0151] Among them, the negative sequence voltage component refers to the symmetrical voltage component whose phase sequence is opposite to that of the positive sequence after the fundamental voltage value is decomposed by the symmetrical component method.

[0152] Among them, the zero-sequence voltage component refers to the three-phase common-mode voltage components with equal amplitude and the same phase after the fundamental voltage value is decomposed by the symmetrical component method.

[0153] Among them, the positive sequence current component refers to the symmetrical current component whose phase differs by 120° and whose phase sequence is consistent with the positive sequence of the system after the fundamental current value is decomposed by the symmetrical component method.

[0154] Among them, the negative sequence current component refers to the symmetrical current component whose phase sequence is opposite to that of the positive sequence after the fundamental current value is decomposed by the symmetrical component method.

[0155] Among them, the zero-sequence current component refers to the three-phase common-mode current components with equal amplitude and the same phase after the fundamental current value is decomposed by the symmetrical component method.

[0156] For example, the server collects the three-phase voltage and current sequences of the transmission line under analysis by deploying voltage and current transformers on the line. Then, it performs frequency domain decomposition processing, such as Fast Fourier Transform or Wavelet Transform, on the three-phase voltage and current sequences to decompose the time-domain electrical quantities into different frequency components, separating the fundamental voltage, harmonic voltage, fundamental current, and harmonic current of the transmission line under analysis. Finally, it performs symmetrical component decomposition processing on the fundamental voltage and current to obtain the fundamental positive-sequence voltage component, negative-sequence voltage component, and zero-sequence voltage component of the transmission line under analysis. The parameters are as follows: the fundamental positive-sequence current component, the negative-sequence current component, and the zero-sequence current component; based on the fundamental positive-sequence voltage component and the positive-sequence current component, the power calculation model is used to perform calculations at each sampling time, and the fundamental frequency active power value sequence and the fundamental frequency reactive power value sequence of the transmission line to be analyzed are obtained by arranging them in time sequence; based on the negative-sequence voltage component, the zero-sequence voltage component, the negative-sequence current component, and the zero-sequence current component, the fundamental frequency unbalanced power generated by the three-phase unbalanced operation is calculated, and the fundamental frequency unbalanced power value sequence is formed by arranging them in time sequence; based on the harmonic voltage value and the harmonic current value, the harmonic distortion power generated by the interaction of each harmonic is calculated, and the harmonic distortion power value sequence is formed by arranging them in time sequence.

[0157] In this embodiment, by performing frequency domain decomposition and symmetrical component decomposition on the three-phase voltage and current sequences of the transmission line, the fundamental component, harmonic components, and positive, negative, and zero-sequence components are accurately separated, realizing the accurate measurement of the fundamental frequency active and reactive power under normal line operation, and providing a comprehensive and accurate data foundation for line loss analysis and load energy efficiency assessment.

[0158] In an exemplary embodiment, frequency domain decomposition processing is performed on the three-phase voltage value sequence and the three-phase current value sequence to obtain the fundamental voltage value and harmonic voltage value of the transmission line to be analyzed, as well as the fundamental current value and harmonic current value of the transmission line to be analyzed. Specifically, the following steps are taken: the three-phase voltage value sequence and the three-phase current value sequence are decomposed in the frequency domain using either the Fast Fourier Transform method or the wavelet packet decomposition method to obtain the fundamental voltage value and harmonic voltage value of the transmission line to be analyzed, as well as the fundamental current value and harmonic current value of the transmission line to be analyzed.

[0159] Among them, the Fast Fourier Transform (FFT) method refers to the classic frequency domain analysis method that decomposes the three-phase voltage and current signals in the time domain into fundamental components and harmonic components through frequency domain transformation, thereby realizing the separation of power frequency and harmonic electrical quantities.

[0160] Among them, wavelet packet decomposition refers to the multi-scale time-frequency decomposition of non-stationary and abrupt electrical signals based on wavelet packet transform. It can achieve high-precision component extraction in both the time and frequency domains and is suitable for time-frequency analysis of non-steady-state conditions with dense harmonics and severe waveform distortion.

[0161] For example, the server adaptively selects either the Fast Fourier Transform (FFT) or Wavelet Packet Decomposition (WPD) method based on the operating conditions and electrical signal stability of the transmission line to be analyzed, and performs frequency domain decomposition processing on the synchronously acquired three-phase voltage and current value sequences. For conventional operating scenarios with relatively stable electrical signals and low waveform distortion, the FFT method is used to convert the continuously acquired three-phase voltage and current signals in the time domain to the frequency domain. The fundamental frequency component and each harmonic component are separated by frequency domain component filtering, thereby obtaining the fundamental voltage, harmonic voltage, fundamental current, and harmonic current values ​​corresponding to the transmission line to be analyzed. For non-steady-state operating scenarios with waveform distortion, signal abrupt changes, and rich harmonic content, the WPD method is used to perform multi-scale and multi-time-frequency window fine decomposition of the three-phase voltage and current sequences, simultaneously achieving accurate extraction of electrical components in the time and frequency domains, effectively distinguishing and separating the fundamental and harmonic electrical quantities, thereby obtaining the fundamental voltage, harmonic voltage, fundamental current, and harmonic current values ​​corresponding to the transmission line to be analyzed.

[0162] In this embodiment, by flexibly selecting Fast Fourier Transform or Wavelet Packet Decomposition for frequency domain decomposition, the component extraction method can be adaptively selected according to the actual operating conditions of the transmission line. The compatibility of the two methods not only ensures the computational efficiency in conventional scenarios, but also improves the accuracy and applicability of electrical quantity decomposition under complex distortion conditions, providing high-precision basic data for subsequent power calculation and line loss analysis.

[0163] In one exemplary embodiment, such as Figure 3 As shown, another line loss analysis method based on the power decomposition principle is provided. Taking the application of this method to a server as an example, the specific steps include:

[0164] Step S301: Obtain the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage effective value sequence of the transmission line to be analyzed during the preset measurement period.

[0165] Step S302: Obtain the first square value of the fundamental frequency active power value sequence, the second square value of the fundamental frequency reactive power value sequence, the third square value of the fundamental frequency unbalanced power value sequence, the fourth square value of the harmonic distortion power value sequence, and the fifth square value of the voltage effective value sequence.

[0166] Step S303: Add the first square value, the second square value, the third square value and the fourth square value to obtain the target square value of the transmission line to be analyzed in the preset measurement period.

[0167] Step S304: Determine the first ratio between the target square value and the fifth square value, the second ratio between the first square value and the fifth square value, the third ratio between the second square value and the fifth square value, the fourth ratio between the third square value and the fifth square value, and the fifth ratio between the fourth square value and the fifth square value.

[0168] Step S305: Perform integration processing on the first ratio, second ratio, third ratio, fourth ratio, and fifth ratio according to the preset integration processing cycle to obtain the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence.

[0169] Step S306: Based on the bus line loss conversion coefficient, the first line loss conversion coefficient, the second line loss conversion coefficient, the third line loss conversion coefficient, and the fourth line loss conversion coefficient, the line loss conversion coefficient of the transmission line to be analyzed is obtained.

[0170] Step S307: Obtain the line loss value of the transmission line to be analyzed during the preset measurement period, and determine the equivalent resistance value of the transmission line to be analyzed based on the line loss value and the line loss conversion coefficient.

[0171] Step S308: Integrate the second ratio according to the preset integration processing period, and use the product between the integrated second ratio and the line equivalent resistance value as the first line loss contribution value of the fundamental frequency active power value sequence.

[0172] Step S309: Integrate the third ratio according to the preset integration processing period, and use the product between the integrated third ratio and the line equivalent resistance value as the second line loss contribution value of the fundamental frequency reactive power value sequence.

[0173] Step S310: Integrate the fourth ratio according to the preset integration processing period, and use the product between the integrated fourth ratio and the line equivalent resistance value as the third line loss contribution value of the fundamental frequency unbalanced power value sequence.

[0174] Step S311: Integrate the fifth ratio according to the preset integration processing period, and use the product between the integrated fifth ratio and the line equivalent resistance value as the fourth line loss contribution value of the harmonic distortion power value sequence.

[0175] Step S312: Based on the first line loss contribution value, the second line loss contribution value, the third line loss contribution value, and the fourth line loss contribution value, the line loss analysis results of the transmission line to be analyzed are obtained.

[0176] In the aforementioned line loss analysis method based on the power decomposition principle, when analyzing the line loss of transmission lines, a multi-dimensional electrical quantity sequence, including fundamental frequency active power, fundamental frequency reactive power, fundamental frequency unbalanced power, harmonic distortion power, and voltage RMS value, is simultaneously collected and comprehensively utilized within a preset measurement period of the transmission line. First, a line loss conversion coefficient that comprehensively reflects the actual operating conditions and power characteristics of the line is accurately constructed. Then, the equivalent resistance of the line, which closely matches the actual operating state, is calculated by combining the measured line loss value, rather than estimating using fixed parameters or a single power component. Finally, line loss calculation and analysis are carried out based on the complete electrical quantity sequence, measurement period, and equivalent resistance. This effectively eliminates the influence of non-fundamental frequency components such as unbalanced power and harmonic distortion power, as well as voltage fluctuations and changes in operating conditions, on the results of traditional line loss analysis, thus improving the accuracy of line loss analysis for transmission lines.

[0177] In an exemplary embodiment, to more clearly illustrate the line loss analysis method based on the power decomposition principle provided in this application, the following specific embodiment will be used to describe the method in detail. In one embodiment, this application also provides a line loss component analysis method based on the equivalent apparent power decomposition principle. Specifically, it includes the following:

[0178] Transmission line losses, as a key technical and economic indicator in power systems, have a significant impact on the operational efficiency and cost control of power companies. Since the 1930s, the academic community has conducted in-depth research on the measurement techniques, management strategies, and optimization methods for transmission line losses. With the rapid development of renewable energy technologies, the spatiotemporal distribution characteristics and calculation of distribution network line losses face new challenges. In recent years, numerous scholars have conducted in-depth research on the physical mechanisms of distribution network technical line losses. Among these, unreasonable line planning can lead to excessively long power supply radii and circuitous power supply problems, increasing the line loss rate by 2.8% to 2.7%. Transformer no-load losses account for as much as 60% to 70% during low-load periods, which is particularly significant in economically underdeveloped areas. Research results indicate that factors such as line layout, conductor cross-sectional area, transformer efficiency, reactive power compensation, three-phase imbalance, and harmonics are key to mitigating technical line losses. The goal of reducing line losses can be achieved by optimizing the power grid topology, selecting energy-efficient transformers, and applying dynamic reactive power compensation technology.

[0179] After more than 100 years of debate, the method of decomposing the apparent power of a three-phase unbalanced nonlinear circuit into positive-sequence fundamental frequency active power, positive-sequence fundamental frequency reactive power, fundamental frequency unbalanced power, harmonic distortion active power and harmonic distortion reactive power, voltage distortion power, and current distortion power has been widely accepted and has formed the standard IEEE 1459-2010. However, this only represents the "expected" power components. The reactive component in the fundamental frequency apparent power, the fundamental frequency unbalanced power, and the harmonic apparent distortion power, voltage distortion power, and current distortion power in the non-fundamental frequency apparent power will all cause "unexpected" active power losses on the transmission line, resulting in a waste of electrical resources.

[0180] Equation (4)

[0181] The table below shows a comparison of important power terms and their symbols:

[0182] Table 1. Comparison of Important Power Terms and Symbols

[0183]

[0184] The Poynting vector characterizes the actual energy flow mechanism of an electromagnetic field. It is represented by the cross product of the electric field strength E and the magnetic field strength H at a point in space, s = E × H, which indicates the magnitude and direction of energy flow at that point. The macroscopic expression of the Poynting vector in steady state is the apparent power S = UI.

[0185] Taking a single-phase ordinary circuit as an example, the magnetic field generated by the active component of the current interacts with the axial electric field of the conductor, providing active energy to the load; while the reactive component magnetic field interacts with the axial electric field of the conductor, and its energy oscillates back and forth between the load and the power source, forming reactive energy. At the same moment, every electric field in the circuit will interact with every magnetic field, among which only the Poynting vector generated by the fundamental frequency electric field and the fundamental frequency active magnetic field is "expected".

[0186] A portion of the Poynting vector does not flow towards the load; instead, it flows out from the conductor surface due to the interaction between the various magnetic field components and the conductor's radial electric field, macroscopically manifesting as transmission line losses. Under time-varying conditions, it is... .in, This refers to transmission line losses. The dynamic apparent power of the time-varying circuit; The root mean square value of the acquired voltage RMS value sequence; For the resistance of the transmission line, This refers to the preset integration period, which can usually be regarded as a constant.

[0187] The unit of measurement is kWh or J, and it can be measured by the difference in active energy meters at both ends of the transmission line. The measurement results can be traced back to the benchmark.

[0188] The unit of measurement is V. It can be measured by a load voltmeter to measure the total effective value of the load voltage signal. The measurement results can be traced back to a reference.

[0189] The unit of measurement is Ω, and a standard resistor can be used as a substitute. Its value can be traced back to the reference.

[0190] The unit of measurement is seconds (s), and it can be measured using a standard time base source. The measurement results are traceable back to the reference.

[0191] The unit of measurement is VA, and the measurements are taken by various apparent power meters. The source of the measurement results is not yet traceable.

[0192] Note that the decomposition of formula (4) is an orthogonal decomposition (active and reactive decomposition, Fourier decomposition, Fortescue decomposition (positive order, negative order, zero order decomposition)), therefore formula (4) satisfies time linear additive.

[0193] Through the The square of each component is integrated over time to quantify the contribution of different "unintended power components" to line losses and to quantitatively assess the additional unintended line losses they generate. This allows for targeted line loss mitigation measures (reactive power compensation for scenarios with high reactive power, harmonic mitigation for scenarios with high harmonics, and imbalance mitigation for scenarios with high imbalance). Line losses caused by the fundamental active power component are considered unmanageable by compensation devices and can only be addressed by reducing the active power impedance of the line (shortening the power supply radius and increasing the wire diameter).

[0194] Existing methods for calculating line losses typically employ the difference between the purchased and sold electricity volume. The calculations cannot decouple the contributions of each power component, making it impossible to further implement lean management.

[0195] Apparent electrical energy obtained by directly integrating apparent power is only suitable for processing steady-state signals. With the construction of new power systems, fluctuations in power sources and loads are becoming more pronounced, and the integration of apparent power will result in significant measurement deviations when processing fluctuating signals.

[0196] This embodiment provides a dynamic operating condition adaptive line loss decoupling method, which constructs an integrable quantity. To achieve time-domain linear additive line loss for each power component (and decompose K into the sum of kp1, kq1, k1u, and kseN (corresponding to: Establish a linear mapping relationship between the square of each component and the physical loss of the line, and quantify and statistically analyze the line loss deviation caused by each unexpected power component in the load over a period of time, so as to carry out targeted line loss management.

[0197] 1. Select a fixed measurement window (e.g., 10ms for half-cycle, corresponding to 64 points; or 10 cycles, corresponding to 1280 points).

[0198] 2. Perform Fourier and Fortescue transforms on each of the Ua, Ub, Uc, Ia, Ib, and Ic channels to obtain the average power values ​​of each component, as shown in the table below: It is the square of the average active power at 50Hz. The square of the average reactive power at 50Hz This is the sum of squares of the remaining negative-sequence and zero-sequence powers at 50Hz. It is the sum of squares of the remaining non-50Hz power.

[0199] 3. According to a fixed measurement window (such as the half-cycle of 10ms determined in (1), corresponding to 64 points; or 10 cycles, corresponding to 1280 points), the above... Accumulate the values ​​and calculate the accumulated value M every 15 minutes / day / month.

[0200] 4. For simple scenarios involving dedicated lines (where a line connects only one transformer user and has one metering point), the first month's allowance can be used directly. And the estimated R of line S in the first month of M s .

[0201] 5. For public line scenarios (where a single line connects only multiple transformer users and has multiple metering points), multiple months' worth of data can be utilized. For each measurement point in multiple months, estimate the corresponding R using methods such as least squares. s .

[0202] 6. According to This allows us to calculate M for each subsequent month and its other components (total M, M component caused by fundamental active power, M component caused by fundamental reactive power, M component caused by fundamental unbalanced power, and M component caused by harmonic power).

[0203] 7. Through the report The contributions of each component can be used to assess the user's main power management objectives (reactive power, imbalance, harmonics, fundamental frequency) And expected governance results (how much line loss can be reduced each month).

[0204] In other embodiments, wavelet packet decomposition can be used instead of fast Fourier transform and symmetric component method to better adapt to non-steady-state high-frequency distortion conditions, especially suitable for scenarios such as inverters with switching frequencies greater than 2kHz; or an adaptive linear element adaptive neural network can be used, combined with a gradient descent optimization module, to track and extract each power component in real time.

[0205] In other embodiments, for public line scenarios where multiple user lines share a line, the robust weighted least squares method can be used to estimate the equivalent resistance of the line, suppress the interference of abnormal data on the calculation results, and construct a mathematical model based on load fluctuation rate to dynamically allocate weights, and adaptively adjust the weight coefficients according to monthly operating data.

[0206] In terms of hardware deployment and computing architecture, this method also has several feasible implementation schemes: one is to adopt an edge computing mode, which integrates power decomposition and line loss analysis algorithms into terminal devices such as electricity meters to reduce data transmission volume and save communication bandwidth; the other is to adopt a cloud platform processing mode, which uploads the raw voltage and current sampling data to the cloud server for centralized calculation to support large-scale, high-precision matrix operations and batch line loss analysis.

[0207] In the above embodiments, when analyzing line losses of transmission lines, a multi-dimensional electrical quantity sequence, including fundamental frequency active power, fundamental frequency reactive power, fundamental frequency unbalanced power, harmonic distortion power, and voltage RMS value, is simultaneously collected and comprehensively utilized within a preset measurement period. This allows for the precise construction of a line loss conversion coefficient that comprehensively reflects the actual operating conditions and power characteristics of the line. Then, the equivalent resistance of the line, closely matching the actual operating state, is calculated by combining the measured line loss value, rather than estimating using fixed parameters or a single power component. Finally, line loss calculation and analysis are performed based on the complete electrical quantity sequence, measurement period, and equivalent resistance. This effectively eliminates the influence of non-fundamental frequency components such as unbalanced power and harmonic distortion power, as well as voltage fluctuations and changes in operating conditions, on the results of traditional line loss analysis. Simultaneously, the core conversion quantity K ensures the time-domain additivity of losses, adapting to wind and solar power fluctuations. For public line scenarios (where a line connects only multiple transformer users and has multiple metering points), R... s The assessment.

[0208] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0209] Based on the same inventive concept, this application also provides a line loss analysis device based on the power decomposition principle for implementing the line loss analysis method based on the power decomposition principle described above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more embodiments of the line loss analysis device based on the power decomposition principle provided below can be found in the limitations of the line loss analysis method based on the power decomposition principle described above, and will not be repeated here.

[0210] In one exemplary embodiment, such as Figure 5 As shown, a line loss analysis device based on the power decomposition principle is provided, including: a data acquisition module 501, a coefficient determination module 502, a resistance determination module 503, and a result determination module 504, wherein:

[0211] The data acquisition module 501 is used to acquire the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence and voltage effective value sequence of the transmission line to be analyzed in a preset measurement period.

[0212] The coefficient determination module 502 is used to determine the line loss conversion coefficient of the transmission line to be analyzed based on the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence and voltage effective value sequence.

[0213] The resistance determination module 503 is used to obtain the line loss value of the transmission line to be analyzed during a preset measurement period, and determine the equivalent resistance value of the transmission line to be analyzed based on the line loss value and the line loss conversion coefficient.

[0214] The result determination module 504 is used to obtain the line loss analysis results of the transmission line to be analyzed based on the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, voltage effective value sequence and line equivalent resistance value.

[0215] In an exemplary embodiment, the coefficient determination module 502 is further configured to acquire the first square value of the fundamental frequency active power value sequence, the second square value of the fundamental frequency reactive power value sequence, the third square value of the fundamental frequency unbalanced power value sequence, the fourth square value of the harmonic distortion power value sequence, and the fifth square value of the voltage effective value sequence; add the first square value, the second square value, the third square value, and the fourth square value to obtain the target square value of the transmission line to be analyzed in a preset measurement period; determine the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence based on the target square value, the first line loss conversion coefficient, the second line loss conversion coefficient, the third line loss conversion coefficient, and the fourth line loss conversion coefficient; and obtain the line loss conversion coefficient of the transmission line to be analyzed based on the line loss conversion coefficient, the first line loss conversion coefficient, the second line loss conversion coefficient, the third line loss conversion coefficient, and the fourth line loss conversion coefficient.

[0216] In an exemplary embodiment, the coefficient determination module 502 is further configured to determine a first ratio between the target squared value and the fifth squared value, a second ratio between the first squared value and the fifth squared value, a third ratio between the second squared value and the fifth squared value, a fourth ratio between the third squared value and the fifth squared value, and a fifth ratio between the fourth squared value and the fifth squared value; and to perform integration processing on the first ratio, the second ratio, the third ratio, the fourth ratio, and the fifth ratio according to a preset integration processing cycle, respectively, to obtain the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence.

[0217] In an exemplary embodiment, the result determination module 504 is further configured to: integrate the second ratio according to a preset integration processing period, and use the product of the integrated second ratio and the line equivalent resistance value as the first line loss contribution value of the fundamental frequency active power value sequence; integrate the third ratio according to a preset integration processing period, and use the product of the integrated third ratio and the line equivalent resistance value as the second line loss contribution value of the fundamental frequency reactive power value sequence; integrate the fourth ratio according to a preset integration processing period, and use the product of the integrated fourth ratio and the line equivalent resistance value as the third line loss contribution value of the fundamental frequency unbalanced power value sequence; integrate the fifth ratio according to a preset integration processing period, and use the product of the integrated fifth ratio and the line equivalent resistance value as the fourth line loss contribution value of the harmonic distortion power value sequence; and obtain the line loss analysis result of the transmission line to be analyzed based on the first line loss contribution value, the second line loss contribution value, the third line loss contribution value, and the fourth line loss contribution value.

[0218] In an exemplary embodiment, the resistance determination module 503 is further configured to, when the line loss conversion coefficient represents the bus loss conversion coefficient of a user transmission line, obtain the line equivalent resistance value of a user transmission line based on the ratio between the line loss value and the bus loss conversion coefficient of a user transmission line, and use this as the line equivalent resistance value of the transmission line to be analyzed; when the line loss conversion coefficient represents the bus loss conversion coefficient of multiple user transmission lines, use an estimation algorithm to estimate the line loss value and the bus loss conversion coefficient of each user transmission line to obtain the sub-line equivalent resistance value of each user transmission line, and use this as the line equivalent resistance value of the transmission line to be analyzed.

[0219] In an exemplary embodiment, the resistance determination module 503 is further configured to construct a system of linear equations based on the line loss value and the total line loss conversion coefficient of each user's transmission line; and to solve the system of linear equations using the least squares method or the robust weighted least squares method to obtain the equivalent resistance value of the sub-line of each user's transmission line.

[0220] In an exemplary embodiment, the data acquisition module 501 is further configured to acquire the three-phase voltage value sequence and the three-phase current value sequence of the transmission line to be analyzed during a preset measurement period; perform frequency domain decomposition processing on the three-phase voltage value sequence and the three-phase current value sequence respectively to obtain the fundamental voltage value and harmonic voltage value of the transmission line to be analyzed, as well as the fundamental current value and harmonic current value of the transmission line to be analyzed; perform component decomposition processing on the fundamental voltage value and the fundamental current value respectively to obtain the positive sequence voltage component, negative sequence voltage component and zero sequence voltage component of the transmission line to be analyzed, as well as the positive sequence current component, negative sequence current component and zero sequence current component of the transmission line to be analyzed; determine the fundamental frequency active power value sequence and the fundamental frequency reactive power value sequence based on the positive sequence voltage component and the positive sequence current component; determine the fundamental frequency unbalanced power value sequence based on the negative sequence voltage component, the zero sequence voltage component, the negative sequence current component and the zero sequence current component; and determine the harmonic distortion power value sequence based on the harmonic voltage value and the harmonic current value.

[0221] In an exemplary embodiment, the data acquisition module 501 is further configured to perform frequency domain decomposition processing on the three-phase voltage value sequence and the three-phase current value sequence using either the fast Fourier transform method or the wavelet packet decomposition method, respectively, to obtain the fundamental voltage value and harmonic voltage value of the transmission line to be analyzed, as well as the fundamental current value and harmonic current value of the transmission line to be analyzed.

[0222] The modules in the aforementioned line loss analysis device based on the power decomposition principle can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0223] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 6As shown, this computer device includes a processor, memory, input / output interfaces (I / O), and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operating system and computer programs stored in the non-volatile storage media. The database stores data such as baseband active power and baseband reactive power values. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a line loss analysis method based on the power decomposition principle.

[0224] Those skilled in the art will understand that Figure 6 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0225] In one exemplary embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0226] In one exemplary embodiment, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps in the above-described method embodiments.

[0227] In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0228] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0229] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0230] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. 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 application should be determined by the appended claims.

Claims

1. A line loss analysis method based on the power decomposition principle, characterized in that, The method includes: Acquire the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage RMS value sequence of the transmission line to be analyzed during a preset measurement period; The line loss conversion coefficient of the transmission line to be analyzed is determined based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, and the voltage effective value sequence. The line loss value of the transmission line to be analyzed is obtained during the preset measurement period, and the equivalent resistance value of the transmission line to be analyzed is determined based on the line loss value and the line loss conversion coefficient. Based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the effective voltage value sequence, and the equivalent resistance value of the line, the line loss analysis results of the transmission line to be analyzed are obtained.

2. The method according to claim 1, characterized in that, The determination of the line loss conversion coefficient of the transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, and the voltage effective value sequence includes: Obtain the first square value of the fundamental frequency active power value sequence, the second square value of the fundamental frequency reactive power value sequence, the third square value of the fundamental frequency unbalanced power value sequence, the fourth square value of the harmonic distortion power value sequence, and the fifth square value of the voltage effective value sequence; The first square value, the second square value, the third square value, and the fourth square value are added together to obtain the target square value of the transmission line to be analyzed in the preset measurement period. Based on the target square value, the first square value, the second square value, the third square value, the fourth square value, and the fifth square value, the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence are determined. Based on the bus line loss conversion coefficient, the first line loss conversion coefficient, the second line loss conversion coefficient, the third line loss conversion coefficient, and the fourth line loss conversion coefficient, the line loss conversion coefficient of the transmission line to be analyzed is obtained.

3. The method according to claim 2, characterized in that, The step of determining the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence based on the target square value, the first square value, the second square value, the third square value, the fourth square value, and the fifth square value includes: Determine a first ratio between the target square value and the fifth square value, a second ratio between the first square value and the fifth square value, a third ratio between the second square value and the fifth square value, a fourth ratio between the third square value and the fifth square value, and a fifth ratio between the fourth square value and the fifth square value; The first ratio, the second ratio, the third ratio, the fourth ratio, and the fifth ratio are integrated according to a preset integration processing period to obtain the line loss conversion coefficient of the transmission line to be analyzed, the first line loss conversion coefficient of the fundamental frequency active power value sequence, the second line loss conversion coefficient of the fundamental frequency reactive power value sequence, the third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence, and the fourth line loss conversion coefficient of the harmonic distortion power value sequence.

4. The method according to claim 3, characterized in that, The line loss analysis results of the transmission line to be analyzed are obtained based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the effective voltage value sequence, and the equivalent resistance value of the line, including: According to the preset integration processing period, the second ratio is integrated, and the product between the integrated second ratio and the line equivalent resistance value is used as the first line loss contribution value of the fundamental frequency active power value sequence. According to the preset integration processing period, the third ratio is integrated, and the product between the integrated third ratio and the line equivalent resistance value is used as the second line loss contribution value of the fundamental frequency reactive power value sequence. According to the preset integration processing period, the fourth ratio is integrated, and the product between the integrated fourth ratio and the line equivalent resistance value is used as the third line loss contribution value of the fundamental frequency unbalanced power value sequence. According to the preset integration processing period, the fifth ratio is integrated, and the product between the integrated fifth ratio and the line equivalent resistance value is used as the fourth line loss contribution value of the harmonic distortion power value sequence. Based on the first line loss contribution value, the second line loss contribution value, the third line loss contribution value, and the fourth line loss contribution value, the line loss analysis result of the transmission line to be analyzed is obtained.

5. The method according to claim 2, characterized in that, The step of determining the equivalent resistance value of the transmission line to be analyzed based on the line loss value and the line loss conversion coefficient includes: When the line loss conversion factor represents the bus loss conversion factor of a user's transmission line, the line equivalent resistance value of the user's transmission line is obtained based on the ratio between the line loss value and the bus loss conversion factor of the user's transmission line, and is used as the line equivalent resistance value of the transmission line to be analyzed. When the line loss conversion coefficient represents the total line loss conversion coefficient of multiple user transmission lines, an estimation algorithm is used to estimate the line loss value and the total line loss conversion coefficient of each user transmission line to obtain the sub-line equivalent resistance value of each user transmission line, which is used as the line equivalent resistance value of the transmission line to be analyzed.

6. The method according to claim 5, characterized in that, The estimation algorithm is used to estimate the line loss value and the total bus loss conversion coefficient of each user's transmission line to obtain the equivalent resistance value of the sub-line of each user's transmission line, including: Based on the line loss value and the total line loss conversion coefficient of each user's transmission line, a system of multiple linear equations is constructed; The system of linear equations is solved using the least squares method or the robust weighted least squares method to obtain the equivalent resistance value of the sub-line of each user's transmission line.

7. The method according to claim 1, characterized in that, The acquisition of the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage RMS value sequence of the transmission line to be analyzed during a preset measurement period includes: Obtain the three-phase voltage value sequence and the three-phase current value sequence of the transmission line to be analyzed during the preset measurement period; Frequency domain decomposition is performed on the three-phase voltage value sequence and the three-phase current value sequence respectively to obtain the fundamental voltage value and harmonic voltage value of the transmission line to be analyzed, as well as the fundamental current value and harmonic current value of the transmission line to be analyzed. The fundamental voltage value and the fundamental current value are respectively subjected to component decomposition processing to obtain the positive sequence voltage component, negative sequence voltage component and zero sequence voltage component of the transmission line to be analyzed, as well as the positive sequence current component, negative sequence current component and zero sequence current component of the transmission line to be analyzed. Based on the positive sequence voltage component and the positive sequence current component, the fundamental frequency active power value sequence and the fundamental frequency reactive power value sequence are determined. Based on the negative sequence voltage component, the zero sequence voltage component, the negative sequence current component, and the zero sequence current component, the fundamental frequency unbalanced power value sequence is determined. Based on the harmonic voltage value and the harmonic current value, the harmonic distortion power value sequence is determined.

8. The method according to claim 7, characterized in that, The step of performing frequency domain decomposition processing on the three-phase voltage value sequence and the three-phase current value sequence to obtain the fundamental voltage value and harmonic voltage value of the transmission line to be analyzed, as well as the fundamental current value and harmonic current value of the transmission line to be analyzed, includes: The three-phase voltage value sequence and the three-phase current value sequence are frequency domain decomposed using either the Fast Fourier Transform method or the wavelet packet decomposition method to obtain the fundamental voltage value and harmonic voltage value of the transmission line to be analyzed, as well as the fundamental current value and harmonic current value of the transmission line to be analyzed.

9. A line loss analysis device based on the power decomposition principle, characterized in that, The device includes: The data acquisition module is used to acquire the fundamental frequency active power value sequence, fundamental frequency reactive power value sequence, fundamental frequency unbalanced power value sequence, harmonic distortion power value sequence, and voltage effective value sequence of the transmission line to be analyzed during a preset measurement period. The coefficient determination module is used to determine the line loss conversion coefficient of the transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, and the voltage effective value sequence. The resistance determination module is used to obtain the line loss value of the transmission line to be analyzed during the preset measurement period, and determine the equivalent resistance value of the transmission line to be analyzed based on the line loss value and the line loss conversion coefficient. The result determination module is used to obtain the line loss analysis results of the transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the voltage effective value sequence, and the line equivalent resistance value.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 8.

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