Line loss correction method and system taking into account the quality of collected data and operating status of the substation area

Abstract

The present invention belongs to the technical field of theoretical line loss calculation of low-voltage distribution network, and specifically relates to a line loss correction method and system that takes into account the quality of data collected and the operating status of the substation. First, the substation characteristics are obtained and the substations are classified according to the substation characteristics to obtain the substation classification results; then the theoretical line loss of the substation with insufficient collection points in each type of substation classification results is calculated; in the theoretical line loss correction model of the substation classification results to which the substation with insufficient collection points belongs, the theoretical line loss correction model corresponding to the number of collection points of the substation with insufficient collection points is selected; the theoretical line loss of the substation with insufficient collection points is input into the selected theoretical line loss correction model to obtain and output the line loss correction result. Based on the voltage loss method, the present invention takes into account the line loss correction method of the substation collection data quality and the operating status, which meets the application of the voltage loss method under different data qualities and improves the accuracy of the line loss calculation of the voltage loss method.

Description

Technical Field

[0001] The present invention belongs to the technical field of theoretical line loss calculation of low-voltage distribution networks, and in particular relates to a line loss correction method and system taking into account the quality of data collected and the operating status of a substation. Background Art

[0002] The line loss of the low-voltage distribution network is an economic indicator that reflects the technical and management level of the power supply unit. The accurate calculation of the line loss of the power supply unit can assist the management unit in formulating reasonable assessment indicators, and can also guide the management unit to reduce losses and save energy, thereby ensuring the economic benefits of the power supply unit.

[0003] Current methods for calculating line loss include equivalent resistance method, power flow method, voltage loss method and machine learning algorithm. The voltage loss method is widely used in low-voltage distribution network line loss calculation because it requires fewer types of data and has higher calculation accuracy based on meeting the calculation requirements.

[0004] However, due to the lack of hardware upgrades for data collection and metering, the power supply units have problems with missing data and limited configuration of data collection tasks, which leads to problems with the quality of basic data collected, and thus inaccurate calculations using the voltage loss method. Therefore, it is urgent to adapt the voltage loss method to different data quality conditions to improve the accuracy of line loss calculations using the voltage loss method. Summary of the invention

[0005] The purpose of the present invention is to provide a line loss correction method and system that takes into account the quality of collected data and the operating status of the substation, so as to solve the problems of missing collected data and limited collection task configuration in the existing voltage loss method, which leads to problems in the quality of the collected basic data and thus causes inaccurate calculations of the voltage loss method.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a line loss correction method taking into account the quality of data collected in the substation area and the operating status, comprising:

[0008] Collect station area characteristics;

[0009] Classify the substations according to their characteristics and obtain several types of substation classification results;

[0010] Based on the results of the area classification, calculate the theoretical line loss LPQ of the area with insufficient collection points in each type of area classification results part* ;

[0011] In the theoretical line loss correction model of the classification result of the substation to which the substation with insufficient collection points belongs, the theoretical line loss correction model corresponding to the number of collection points of the substation with insufficient collection points is selected;

[0012] The theoretical line loss LPQ of the area with insufficient collection points part* Input the selected theoretical line loss correction model to obtain the line loss correction result LPQ all* ;

[0013] Output line loss correction result LPQ all* ;

[0014] The theoretical line loss correction model is obtained by the following steps:

[0015] Collecting historical data, wherein the historical data includes historical station area characteristics;

[0016] Classify the stations according to the historical station characteristics and obtain the historical station classification results;

[0017] For each historical substation classification result, the voltage, current and power factor data of the substation with complete collection points are obtained, and the theoretical line loss LPQ of each substation with complete collection points is calculated using the voltage loss method. all ;

[0018] In the collection point data of each substation with complete collection points, a number of collection points are selected, the number of which is the number of collection points of the substation with insufficient collection points, the voltage, current and power factor data of the selected collection points are obtained, and the theoretical line loss LPQ of the substation with insufficient collection points is calculated using the voltage loss method. part ;

[0019] Calculate the ratio coefficient L, the formula is as follows:

[0020]

[0021] For each historical station classification result, select the middle value L of the distribution interval of all ratio coefficients L m Correction coefficient of the theoretical line loss correction model as a result of the historical substation classification;

[0022] The theoretical line loss correction model is established as follows:

[0023] LPQ all* =L m ×LPQ part* .

[0024] Optionally, the area with complete collection points is an area with 96 collection points within 24 hours, and the area with insufficient collection points is an area with 4, 12 or 24 collection points within 24 hours.

[0025] Optionally, the station area characteristics include static characteristics and dynamic characteristics, the static characteristics include: urban / rural network, station area capacity and number of users; the dynamic characteristics include: load rate and load shape coefficient;

[0026] The calculation formula of the load rate is as follows:

[0027]

[0028] In the formula, the area capacity is the rated capacity of the transformer;

[0029] The average power is calculated as follows:

[0030] Average power = average active power × current transformer ratio × voltage transformer ratio × meter ratio

[0031] In the formula, the average active power is the average active power of the 12 collection points with the highest load in the substation area within 24 hours; the average active power of the substation area with 4 collection points is the average active power of the 4 collection points;

[0032] The calculation formula of load shape factor K is as follows:

[0033]

[0034] In the formula, I jf I is the RMS current at the head end of the line in the substation area; pj is the average load current at the head end of the substation line; I ai I is the current of phase A of the main meter at the head end of the substation at the i-th moment; bi is the current of phase B of the total meter at the head end of the substation at the i-th moment; I ci is the current of phase C of the total meter at the head end of the area at the i-th moment; I zi is the zero-sequence current of the total meter at the head end of the substation at the i-th moment; m is the total time, taking 96 collection points; PPQ is the active power supply at the head end of the substation; U pj is the average operating voltage of the substation line; cosφ is the power factor of the low-voltage line, which is 1; T is the operating time of the substation line, which is 24h.

[0035] Optionally, in the step of classifying the substations according to substation characteristics to obtain substation classification results:

[0036] The classification result of the substation area is a three-digit number, and the first digit from left to right is in the range of 1-6, where: 1 is the urban concentrated residential area, 2 is the urban commercial area, 3 is the other urban areas, 4 is the rural concentrated community area, 5 is the rural ordinary village area, and 6 is the other rural areas;

[0037] The second digit from left to right has a value range of 1-3, where: 1 is a light-loaded area; the light-loaded area is an area with an area load rate of less than 30%; 2 is a normal area; the normal area is an area with an area load rate greater than or equal to 30% and less than 70%; 3 is a heavy-loaded area; the heavy-loaded area is an area with an area load rate greater than or equal to 70%;

[0038] The third digit from left to right has a value range of 1-3, where 1 is a station with small load changes, and the station with small load changes is a station with a load shape coefficient less than 0.9; 2 is a station with normal load changes, and the station with normal load changes is a station with a load shape coefficient greater than or equal to 0.9 and less than 2; 3 is a station with large load changes, and the station with large load changes is a station with a load shape coefficient greater than or equal to 2.

[0039] In a second aspect, the present invention provides a line loss correction system that takes into account the quality of data collected in the substation area and the operating status, comprising:

[0040] Data collection module, used to collect station area characteristics;

[0041] The classification module is used to classify the substations according to the substation characteristics obtained by the data acquisition module to obtain classification results of several types of substations;

[0042] The calculation module is used to calculate the theoretical line loss LPQ of the substation with insufficient collection points in each type of substation classification results based on the substation classification results obtained in the classification module. part* ;

[0043] A selection module is used to select a theoretical line loss correction model corresponding to the number of collection points of the substation with insufficient collection points from the theoretical line loss correction model of the substation classification result to which the substation with insufficient collection points belongs;

[0044] The data processing module is used to calculate the theoretical line loss LPQ of the substation with insufficient collection points obtained in the calculation module. part* Input the theoretical line loss correction model selected by the selection module to obtain the line loss correction result LPQ all* ;

[0045] Output module, used to output the line loss correction result LPQ obtained by the data processing module all* ;

[0046] The theoretical line loss correction model is obtained by the following steps:

[0047] Collecting historical data, wherein the historical data includes historical station area characteristics;

[0048] Classify the stations according to the historical station characteristics and obtain the historical station classification results;

[0049] For each historical substation classification result, the voltage, current and power factor data of the substation with complete collection points are obtained, and the theoretical line loss LPQ of each substation with complete collection points is calculated using the voltage loss method. all ;

[0050] In the collection point data of each substation with complete collection points, a number of collection points are selected, the number of which is the number of collection points of the substation with insufficient collection points, the voltage, current and power factor data of the selected collection points are obtained, and the theoretical line loss LPQ of the substation with insufficient collection points is calculated using the voltage loss method. part ;

[0051] Calculate the ratio coefficient L, the formula is as follows:

[0052]

[0053] For each historical station classification result, select the middle value L of the distribution interval of all ratio coefficients L m Correction coefficient of the theoretical line loss correction model as a result of the historical substation classification;

[0054] The theoretical line loss correction model is established as follows:

[0055] LPQ all* =L m ×LPQ part* .

[0056] Optionally, the area with complete collection points is an area with 96 collection points within 24 hours, and the area with insufficient collection points is an area with 4, 12 or 24 collection points within 24 hours.

[0057] Optionally, the station area characteristics include static characteristics and dynamic characteristics, the static characteristics include: urban / rural network, station area capacity and number of users; the dynamic characteristics include: load rate and load shape coefficient;

[0058] The calculation formula of the load rate is as follows:

[0059]

[0060] In the formula, the area capacity is the rated capacity of the transformer;

[0061] The average power is calculated as follows:

[0062] Average power = average active power × current transformer ratio × voltage transformer ratio × meter ratio

[0063] In the formula, the average active power is the average active power of the 12 collection points with the highest load in the substation area within 24 hours; the average active power of the substation area with 4 collection points is the average active power of the 4 collection points;

[0064] The calculation formula of load shape factor K is as follows:

[0065]

[0066] In the formula, I jf I is the RMS current at the head end of the line in the substation area; pj is the average load current at the head end of the substation line; I ai I is the current of phase A of the main meter at the head end of the substation at the i-th moment; bi is the current of phase B of the total meter at the head end of the substation at the i-th moment; I ci is the current of phase C of the total meter at the head end of the area at the i-th moment; I zi is the zero-sequence current of the total meter at the head end of the substation at the i-th moment; m is the total time, taking 96 collection points; PPQ is the active power supply at the head end of the substation; U pj is the average operating voltage of the substation line; cosφ is the power factor of the low-voltage line, which is 1; T is the operating time of the substation line, which is 24h.

[0067] Optionally, in the step of classifying the substations according to substation characteristics to obtain substation classification results:

[0068] The classification result of the substation area is a three-digit number, and the first digit from left to right is in the range of 1-6, where: 1 is the urban concentrated residential area, 2 is the urban commercial area, 3 is the other urban areas, 4 is the rural concentrated community area, 5 is the rural ordinary village area, and 6 is the other rural areas;

[0069] The second digit from left to right has a value range of 1-3, where: 1 is a light-loaded area; the light-loaded area is an area with an area load rate of less than 30%; 2 is a normal area; the normal area is an area with an area load rate greater than or equal to 30% and less than 70%; 3 is a heavy-loaded area; the heavy-loaded area is an area with an area load rate greater than or equal to 70%;

[0070] The third digit from left to right has a value range of 1-3, where 1 is a station with small load changes, and the station with small load changes is a station with a load shape coefficient less than 0.9; 2 is a station with normal load changes, and the station with normal load changes is a station with a load shape coefficient greater than or equal to 0.9 and less than 2; 3 is a station with large load changes, and the station with large load changes is a station with a load shape coefficient greater than or equal to 2.

[0071] In a third aspect, the present invention provides an electronic device including a processor and a memory, wherein the processor is used to execute a computer program stored in the memory to implement the line loss correction method that takes into account the quality of data collected in the substation and the operating status.

[0072] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores at least one instruction, and when the at least one instruction is executed by a processor, the line loss correction method that takes into account the quality of data collected in the substation and the operating status is implemented.

[0073] Compared with the prior art, the present invention has the following beneficial effects:

[0074] The present invention provides a line loss correction method and system taking into account the quality of data collection and operation status of a substation, which comprises the following steps: firstly, substation characteristics are collected; substations are classified according to the substation characteristics to obtain classification results of several types of substations; based on the substation classification results, theoretical line losses of substations with insufficient number of collection points in each type of substation classification results are calculated; in the theoretical line loss correction model of the substation classification results to which the substations with insufficient number of collection points belong, a theoretical line loss correction model corresponding to the number of collection points of the substations with insufficient number of collection points is selected; the theoretical line loss of the substations with insufficient number of collection points is input into the selected theoretical line loss correction model to obtain a line loss correction result; and finally the line loss correction result is output.

[0075] Based on the voltage loss method, the present invention proposes a line loss correction method that takes into account the quality of data collected in the substation and the operating status, which meets the application of the voltage loss method under different data qualities and improves the accuracy of line loss calculation of the voltage loss method. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0077] Figure 1 A flow chart of a line loss correction method taking into account the quality of data collected in the substation area and the operating status of the present invention;

[0078] Figure 2 The structure diagram of the line loss correction system of the present invention taking into account the quality of the collected data and the operating status of the substation area;

[0079] Figure 3 A structural block diagram of an electronic device of the present invention;

[0080] Figure 4 This is a flow chart of the method for obtaining the theoretical line loss correction model of the present invention. DETAILED DESCRIPTION

[0081] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0082] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0083] Example 1

[0084] As attached Figure 1 As shown, the present invention proposes a line loss correction method that takes into account the quality of data collected in the substation area and the operating status.

[0085] 1. Area characteristic indicators

[0086] The data mainly comes from the collection and marketing system. Dynamic and static characteristic indicators that depict the substation portrait are constructed based on the data sources. Among them, the substation characteristics include static characteristics of the substation that reflect the substation archives and dynamic characteristics of the substation that reflect the operating status of the substation; static characteristics of the substation include: substation capacity, number of users, active / passive and urban network / rural network, etc.; dynamic characteristics of the substation include: load rate and load shape coefficient.

[0087] The calculation formula of the load factor is shown in the following formula (1):

[0088]

[0089] In the formula, the area capacity is the rated capacity of the transformer;

[0090] The average power is calculated as follows:

[0091] Average power = average active power × current transformer ratio × voltage transformer ratio × meter ratio

[0092] In the formula, the average active power is the average active power of the 12 collection points with the highest load in the substation area within 24 hours; for substations with less than 12 collection points, the average active power is the average active power of all collection points;

[0093] The calculation formula of load shape factor K is shown in the following formula (2):

[0094]

[0095] In the formula, I jf I is the RMS current at the head end of the line in the substation area; pj is the average load current at the head end of the substation line; Iai I is the current of phase A of the main meter at the head end of the substation at the i-th moment; bi is the current of phase B of the total meter at the head end of the substation at the i-th moment; I ci is the current of phase C of the total meter at the head end of the area at the i-th moment; I zi is the zero-sequence current of the total meter at the head end of the substation at the i-th moment; m is the total time, which is determined according to the acquisition configuration, and generally takes 96 acquisition points; PPQ is the active power supply at the head end of the substation; U pj is the average operating voltage of the substation line; cosφ is the power factor of the low-voltage line, and the default value is 1; T is the operating time of the substation line, and the value is 24h.

[0096] 2. Classification of substations based on substation characteristic indicators

[0097] Based on the characteristic indicators of the substations, the substation classification rules are as follows according to the business experience of experts and on-site operation data analysis:

[0098]

[0099] The classification result of the substation is a three-digit number. The first digit ranges from 1 to 6, representing the urban and rural network, substation capacity and number of users; the second digit ranges from 1 to 3, representing the load rate; the third digit ranges from 1 to 3, representing the load shape factor; there are a total of 54 substation classification results.

[0100] If the substation category is 111, it means a substation with concentrated urban residential areas, light loads and small load changes; if the substation category is 433, it means a substation with concentrated rural areas, heavy loads and large load changes.

[0101] 3. Construct a theoretical line loss calculation correction model when the number of collection points is insufficient

[0102] For each type of substation classification result, follow the steps below to complete the correction model construction:

[0103] 1) Using the voltage, current and power factor data of the area with complete collection points as samples, the voltage loss method is used to calculate the theoretical power loss LPQ of each area with complete collection points all ;

[0104] 2) Select several collection points from the curve data of each area with complete collection points, the number of which is the number of collection points in the area with insufficient collection points, obtain the voltage, current and power factor data of the selected collection points, and then use the voltage loss method to calculate the theoretical loss power LPQ of the area with insufficient collection points part ;

[0105] 3) Calculate the ratio coefficient L of the theoretical power loss of the substations with complete and insufficient collection points. The formula is as follows:

[0106]

[0107] 4) According to the central limit theorem, when the sample data volume of the station area is large enough, the distribution of the ratio coefficient L approaches the normal distribution, that is, L will be concentrated in a certain interval and the number on both sides of the interval will gradually decrease. Set the middle value of the interval to L m ;

[0108] 5) The middle value L of the ratio coefficient of each category m As the correction coefficient of the theoretical line loss correction model with insufficient collection points, the correction model is established as follows:

[0109] LPQ all* =L m ×LPQ part* .

[0110] Among them, the area with complete collection points is the area with 96 collection points within 24 hours. Some areas have less than 96 collection points because the collection storage equipment has not been upgraded. The area with insufficient collection points is the area with 4, 12 or 24 collection points within 24 hours.

[0111] 4. Calculation of theoretical line loss correction when the number of data collection points in the substation is insufficient

[0112] For the substations with insufficient collection points, they are first classified according to their static and dynamic indicators; for the substations with insufficient collection points, the theoretical power loss LPQ of the substations with insufficient collection points is calculated based on the voltage loss method. part* ; In the theoretical line loss correction model of the classification result of the substation area with insufficient collection points, select the theoretical line loss correction model corresponding to the number of collection points in the substation area with insufficient collection points; then part* Enter the selected theoretical line loss correction model to calculate the complete loss power LPQ all* =L m ×LPQ part* , and obtain the line loss correction result LPQ for the substation with insufficient collection points all* .

[0113] 200 substations with insufficient collection points (4 collection points and fixed collection times of 7:00, 11:00, 15:00 and 19:00) were randomly selected in a city, and the theoretical loss power LPQ was calculated by applying the voltage loss method. part* , and then calculate the line loss rate Rate according to the power supply of the substation area part ; Use the 180-day data of 150,000 complete substations in the province where the city is located to build a correction model; classify the indicators of 200 substations, bring them into the correction model, and obtain their respective accurate theoretical loss power LPQall* and line loss rate all The line loss rate calculated by the Newtonian flow method and the mean absolute percentage error (MAPE) before and after correction are shown in the following table:

[0114]

[0115] The calculation formula of MAPE is:

[0116]

[0117] Where: n is the number of samples to which the model is applied, y i is the power flow normal loss rate, It is the calculated line loss rate, with a value range of [0,+∞). A MAPE of 0% indicates a perfect model, and a MAPE greater than 100% indicates a poor model. The smaller the MAPE value, the better the accuracy of the prediction model.

[0118] Comparing the calculated line loss rate with the line loss rate of the power flow method, the average MAPE value before correction is 40.55%, which deviates greatly from the result calculated by the power flow method; the average MAPE value after correction is 5.24%, which is closer to the result of the power flow method, proving the accuracy of this method.

[0119] Example 2

[0120] The present invention provides a line loss correction system taking into account the quality of data collected in the substation area and the operating status, comprising:

[0121] Data collection module, used to collect station area characteristics;

[0122] A classification module is used to classify the substations according to their characteristics and obtain classification results of several types of substations;

[0123] The station area characteristics include static characteristics and dynamic characteristics. The static characteristics include: urban / rural network, station area capacity and number of users; the dynamic characteristics include: load rate and load shape coefficient;

[0124] The calculation formula of the load rate is as follows:

[0125]

[0126] In the formula, the area capacity is the rated capacity of the transformer;

[0127] The average power is calculated as follows:

[0128] Average power = average active power × current transformer ratio × voltage transformer ratio × meter ratio

[0129] In the formula, the average active power is the average active power of the 12 collection points with the highest load in the substation area within 24 hours; for the substation area with less than 12 collection points, the average active power is the average active power of all collection points;

[0130] The calculation formula of load shape factor K is as follows:

[0131]

[0132] In the formula, I jf I is the RMS current at the head end of the line in the substation area; pj is the average load current at the head end of the substation line; I ai I is the current of phase A of the main meter at the head end of the substation at the i-th moment; bi is the current of phase B of the total meter at the head end of the substation at the i-th moment; I ci is the current of phase C of the total meter at the head end of the area at the i-th moment; I zi is the zero-sequence current of the total meter at the head end of the substation at the i-th moment; m is the total time, taking 96 collection points; PPQ is the active power supply at the head end of the substation; U pj is the average operating voltage of the substation line; cosφ is the power factor of the low-voltage line, which is 1; T is the operating time of the substation line, which is 24h;

[0133] The classification result of the substation area is a three-digit number, and the first digit from left to right is in the range of 1-6, where: 1 is the urban concentrated residential area, 2 is the urban commercial area, 3 is the other urban areas, 4 is the rural concentrated community area, 5 is the rural ordinary village area, and 6 is the other rural areas;

[0134] The second digit from left to right has a value range of 1-3, where: 1 is a light-loaded area; the light-loaded area is an area with an area load rate of less than 30%; 2 is a normal area; the normal area is an area with an area load rate greater than or equal to 30% and less than 70%; 3 is a heavy-loaded area; the heavy-loaded area is an area with an area load rate greater than or equal to 70%;

[0135] The third digit from left to right has a value range of 1-3, where 1 is a station with small load changes, and the station with small load changes is a station with a load shape coefficient less than 0.9; 2 is a station with normal load changes, and the station with normal load changes is a station with a load shape coefficient greater than or equal to 0.9 and less than 2; 3 is a station with large load changes, and the station with large load changes is a station with a load shape coefficient greater than or equal to 2.

[0136] The calculation module is used to calculate the theoretical line loss LPQ of the substation with insufficient collection points in each type of substation classification results based on the substation classification results obtained in the classification module. part* .

[0137] A selection module is used to select a theoretical line loss correction model corresponding to the number of collection points of the substation with insufficient collection points from the theoretical line loss correction model of the substation classification result to which the substation with insufficient collection points belongs;

[0138] The data processing module is used to input the theoretical line loss of the substation with insufficient collection points obtained in the calculation module into the theoretical line loss correction model selected by the selection module to obtain the line loss correction result LPQ all* ;

[0139] The theoretical line loss correction model is obtained by the following steps:

[0140] Collecting historical data, wherein the historical data includes historical station area characteristics;

[0141] Classify the stations according to the historical station characteristics and obtain the historical station classification results;

[0142] For each historical substation classification result, the voltage, current and power factor data of the substation with complete collection points are obtained, and the theoretical line loss LPQ of each substation with complete collection points is calculated using the voltage loss method. all ;

[0143] In the collection point data of each substation with complete collection points, a number of collection points are selected, the number of which is the number of collection points of the substation with insufficient collection points, the voltage, current and power factor data of the selected collection points are obtained, and the theoretical line loss LPQ of the substation with insufficient collection points is calculated using the voltage loss method. part ;

[0144] Calculate the ratio coefficient L, the formula is as follows:

[0145]

[0146] For each historical station classification result, select the middle value L of the distribution interval of all ratio coefficients L m Correction coefficient of the theoretical line loss correction model as a result of the historical substation classification;

[0147] The theoretical line loss correction model is established as follows:

[0148] LPQ all* =L m ×LPQ part*

[0149] Among them, the area with complete collection points is an area with 96 collection points within 24 hours, and the area with insufficient collection points is an area with 4, 12 or 24 collection points within 24 hours.

[0150] Output module, used to output the line loss correction result LPQ obtained by the data processing module all* .

[0151] Example 3

[0152] See also Figure 3 As shown, the present invention also provides an electronic device 100 for implementing a line loss correction method that takes into account the quality of data collected in the substation and the operating status; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0153] The memory 101 can be used to store the computer program 103. The processor 102 implements the line loss correction method steps of taking into account the quality of the data collected in the substation area and the operating status described in Example 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data (such as audio data) created according to the use of the electronic device 100, etc. In addition, the memory 101 can include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0154] The at least one processor 102 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor, etc. The processor 102 is the control center of the electronic device 100, and uses various interfaces and lines to connect various parts of the entire electronic device 100.

[0155] The memory 101 in the electronic device 100 stores a plurality of instructions to implement a line loss correction method that takes into account the quality of the collected data and the operating status of the substation area. The processor 102 can execute the plurality of instructions to implement:

[0156] Collect station area characteristics;

[0157] Classify the substations according to their characteristics and obtain several types of substation classification results;

[0158] Based on the results of the area classification, calculate the theoretical line loss LPQ of the area with insufficient collection points in each type of area classification results part* ;

[0159] In the theoretical line loss correction model of the classification result of the substation to which the substation with insufficient collection points belongs, the theoretical line loss correction model corresponding to the number of collection points of the substation with insufficient collection points is selected;

[0160] The theoretical line loss LPQ of the area with insufficient collection points part* Input the selected theoretical line loss correction model to obtain the line loss correction result LPQ all* ;

[0161] Output line loss correction result LPQ all* ;

[0162] The theoretical line loss correction model is obtained by the following steps:

[0163] Collecting historical data, wherein the historical data includes historical station area characteristics;

[0164] Classify the stations according to the historical station characteristics and obtain the historical station classification results;

[0165] For each historical substation classification result, the voltage, current and power factor data of the substation with complete collection points are obtained, and the theoretical line loss LPQ of each substation with complete collection points is calculated using the voltage loss method. all ;

[0166] In the collection point data of each substation with complete collection points, a number of collection points are selected, the number of which is the number of collection points of the substation with insufficient collection points, the voltage, current and power factor data of the selected collection points are obtained, and the theoretical line loss LPQ of the substation with insufficient collection points is calculated using the voltage loss method. part ;

[0167] Calculate the ratio coefficient L, the formula is as follows:

[0168]

[0169] For each historical station classification result, select the middle value L of the distribution interval of all ratio coefficients L m Correction coefficient of the theoretical line loss correction model as a result of the historical substation classification;

[0170] The theoretical line loss correction model is established as follows:

[0171] LPQ all* =L m ×LPQ part* .

[0172] Example 4

[0173] If the module / unit integrated in the electronic device 100 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory and read-only memory (ROM, Read-Only Memory).

[0174] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0175] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0176] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0177] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0178] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. Line loss correction method taking into account the quality of data collected and the operating status of the substation area, It is characterized in that include: Collect station area characteristics; Classify the substations according to their characteristics and obtain several types of substation classification results; Based on the results of the area classification, calculate the theoretical line loss LPQ of the area with insufficient collection points in each type of area classification results part* ; In the theoretical line loss correction model of the classification result of the substation to which the substation with insufficient collection points belongs, the theoretical line loss correction model corresponding to the number of collection points of the substation with insufficient collection points is selected; The theoretical line loss LPQ of the area with insufficient collection points part* Input the selected theoretical line loss correction model to obtain the line loss correction result LPQ all* ; Output line loss correction result LPQ all* ; The theoretical line loss correction model is obtained by the following steps: Collecting historical data, wherein the historical data includes historical station area characteristics; Classify the stations according to the historical station characteristics and obtain the historical station classification results; For each historical substation classification result, the voltage, current and power factor data of the substation with complete collection points are obtained, and the theoretical line loss LPQ of each substation with complete collection points is calculated using the voltage loss method. all ; In the collection point data of each substation with complete collection points, a number of collection points are selected, the number of which is the number of collection points of the substation with insufficient collection points, the voltage, current and power factor data of the selected collection points are obtained, and the theoretical line loss LPQ of the substation with insufficient collection points is calculated using the voltage loss method. part ; Calculate the ratio coefficient L, the formula is as follows: For each historical station classification result, select the middle value L of the distribution interval of all ratio coefficients L m Correction coefficient of the theoretical line loss correction model as a result of the historical substation classification; The theoretical line loss correction model is established as follows: LPQ all* =L m ×LPQ part* ; The area with complete collection points is an area with 96 collection points within 24 hours, and the area with insufficient collection points is an area with 4, 12 or 24 collection points within 24 hours; The station area characteristics include static characteristics and dynamic characteristics. The static characteristics include: urban / rural network, station area capacity and number of users; the dynamic characteristics include: load rate and load shape coefficient; The calculation formula of the load rate is as follows: In the formula, the area capacity is the rated capacity of the transformer; The average power is calculated as follows: Average power = average active power × current transformer ratio × voltage transformer ratio × meter ratio In the formula, the average active power is the average active power of the 12 collection points with the highest load in the substation area within 24 hours; the average active power of the substation area with 4 collection points is the average active power of the 4 collection points; The calculation formula of load shape factor K is as follows: In the formula, I jf I is the RMS current at the head end of the line in the substation area; pj is the average load current at the head end of the substation line; I ai I is the current of phase A of the main meter at the head end of the substation at the i-th moment; bi is the current of phase B of the total meter at the head end of the substation at the i-th moment; I ci is the current of phase C of the total meter at the head end of the area at the i-th moment; I zi is the zero-sequence current of the total meter at the head end of the substation at the i-th moment; m is the total time, taking 96 collection points; PPQ is the active power supply at the head end of the substation; U pj is the average operating voltage of the substation line; cosφ is the power factor of the low-voltage line, which is 1; T is the operating time of the substation line, which is 24h; For the substations with insufficient collection points, they are first classified according to their static and dynamic indicators; for the substations with insufficient collection points, the theoretical power loss LPQ of the substations with insufficient collection points is calculated based on the voltage loss method. part* ; In the theoretical line loss correction model of the classification result of the substation area with insufficient collection points, select the theoretical line loss correction model corresponding to the number of collection points in the substation area with insufficient collection points; then part* Enter the selected theoretical line loss correction model to calculate the complete loss power LPQ all* =L m ×LPQ part* , and obtain the line loss correction result LPQ for the substation with insufficient collection points all* .

2. The line loss correction method according to claim 1 taking into account the quality of the collected data and the operating status of the substation area, It is characterized in that In the step of classifying the substations according to the substation characteristics to obtain the substation classification results: The classification result of the substation area is a three-digit number, and the first digit from left to right is in the range of 1-6, where: 1 is the urban concentrated residential area, 2 is the urban commercial area, 3 is the other urban areas, 4 is the rural concentrated community area, 5 is the rural ordinary village area, and 6 is the other rural areas; The second digit from left to right has a value range of 1-3, where: 1 is a light-loaded area; the light-loaded area is an area with an area load rate of less than 30%; 2 is a normal area; the normal area is an area with an area load rate greater than or equal to 30% and less than 70%; 3 is a heavy-loaded area; the heavy-loaded area is an area with an area load rate greater than or equal to 70%; The third digit from left to right has a value range of 1-3, where 1 is a station with small load changes, and the station with small load changes is a station with a load shape coefficient less than 0.9; 2 is a station with normal load changes, and the station with normal load changes is a station with a load shape coefficient greater than or equal to 0.9 and less than 2; 3 is a station with large load changes, and the station with large load changes is a station with a load shape coefficient greater than or equal to 2.

3. Line loss correction system taking into account the quality of data collected and the operating status of the substation, It is characterized in that include: Data collection module, used to collect station area characteristics; The classification module is used to classify the substations according to the substation characteristics obtained by the data acquisition module to obtain classification results of several types of substations; The calculation module is used to calculate the theoretical line loss LPQ of the substation with insufficient collection points in each type of substation classification results based on the substation classification results obtained in the classification module. part* ; A selection module is used to select a theoretical line loss correction model corresponding to the number of collection points of the substation with insufficient collection points from the theoretical line loss correction model of the substation classification result to which the substation with insufficient collection points belongs; The data processing module is used to calculate the theoretical line loss LPQ of the substation with insufficient collection points obtained in the calculation module. part* Input the theoretical line loss correction model selected by the selection module to obtain the line loss correction result LPQ all* ; Output module, used to output the line loss correction result LPQ obtained by the data processing module all* ; The theoretical line loss correction model is obtained by the following steps: Collecting historical data, wherein the historical data includes historical station area characteristics; Classify the stations according to the historical station characteristics and obtain the historical station classification results; For each historical substation classification result, the voltage, current and power factor data of the substation with complete collection points are obtained, and the theoretical line loss LPQ of each substation with complete collection points is calculated using the voltage loss method. all ; In the collection point data of each substation with complete collection points, a number of collection points are selected, the number of which is the number of collection points of the substation with insufficient collection points, the voltage, current and power factor data of the selected collection points are obtained, and the theoretical line loss LPQ of the substation with insufficient collection points is calculated using the voltage loss method. part ; Calculate the ratio coefficient L, the formula is as follows: For each historical station classification result, select the middle value L of the distribution interval of all ratio coefficients L m Correction coefficient of the theoretical line loss correction model as a result of the historical substation classification; The theoretical line loss correction model is established as follows: LPQ all* =L m ×LPQ part* ; The area with complete collection points is an area with 96 collection points within 24 hours, and the area with insufficient collection points is an area with 4, 12 or 24 collection points within 24 hours; The station area characteristics include static characteristics and dynamic characteristics. The static characteristics include: urban / rural network, station area capacity and number of users; the dynamic characteristics include: load rate and load shape coefficient; The calculation formula of the load rate is as follows: In the formula, the area capacity is the rated capacity of the transformer; The average power is calculated as follows: Average power = average active power × current transformer ratio × voltage transformer ratio × meter ratio In the formula, the average active power is the average active power of the 12 collection points with the highest load in the substation area within 24 hours; the average active power of the substation area with 4 collection points is the average active power of the 4 collection points; The calculation formula of load shape factor K is as follows: In the formula, I jf I is the RMS current at the head end of the line in the substation area; pj is the average load current at the head end of the substation line; I ai I is the current of phase A of the main meter at the head end of the substation at the i-th moment; bi is the current of phase B of the total meter at the head end of the substation at the i-th moment; I ci is the current of phase C of the total meter at the head end of the area at the i-th moment; I zi is the zero-sequence current of the total meter at the head end of the substation at the i-th moment; m is the total time, taking 96 collection points; PPQ is the active power supply at the head end of the substation; U pj is the average operating voltage of the substation line; cosφ is the power factor of the low-voltage line, which is 1; T is the operating time of the substation line, which is 24h; For the substations with insufficient collection points, they are first classified according to their static and dynamic indicators; for the substations with insufficient collection points, the theoretical power loss LPQ of the substations with insufficient collection points is calculated based on the voltage loss method. part* ; In the theoretical line loss correction model of the classification result of the substation area with insufficient collection points, select the theoretical line loss correction model corresponding to the number of collection points in the substation area with insufficient collection points; then part* Enter the selected theoretical line loss correction model to calculate the complete loss power LPQ all* =L m ×LPQ part* , and obtain the line loss correction result LPQ for the substation with insufficient collection points all* .

4. The line loss correction system taking into account the quality of the collected data and the operating status of the substation according to claim 3, It is characterized in that In the step of classifying the substations according to the substation characteristics to obtain the substation classification results: The classification result of the substation area is a three-digit number, and the first digit from left to right is in the range of 1-6, where: 1 is the urban concentrated residential area, 2 is the urban commercial area, 3 is the other urban areas, 4 is the rural concentrated community area, 5 is the rural ordinary village area, and 6 is the other rural areas; The second digit from left to right has a value range of 1-3, where: 1 is a light-loaded area; the light-loaded area is an area with an area load rate of less than 30%; 2 is a normal area; the normal area is an area with an area load rate greater than or equal to 30% and less than 70%; 3 is a heavy-loaded area; the heavy-loaded area is an area with an area load rate greater than or equal to 70%; The third digit from left to right has a value range of 1-3, where 1 is a station with small load changes, and the station with small load changes is a station with a load shape coefficient less than 0.9; 2 is a station with normal load changes, and the station with normal load changes is a station with a load shape coefficient greater than or equal to 0.9 and less than 2; 3 is a station with large load changes, and the station with large load changes is a station with a load shape coefficient greater than or equal to 2.

5. An electronic device, It is characterized in that It comprises a processor and a memory, wherein the processor is used to execute a computer program stored in the memory to implement the line loss correction method taking into account the quality of data collected in the substation and the operating status as described in any one of claims 1 to 2.

6. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores at least one instruction, and when the at least one instruction is executed by the processor, the line loss correction method taking into account the quality of the collected data and the operating status of the substation as described in any one of claims 1 to 2 is implemented.

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