Method for analyzing influence of metering information abnormity of power supply-selling side on 10kV synchronous line loss

Abstract

The invention discloses a method for analyzing the influence of metering information abnormity of a power supply-selling side on 10kV synchronous line loss, and belongs to the field of line loss analysis. In the process of processing line loss calculation data in the same period, starting from a 10kV branching topological structure, constructing a quantitative model of influence of metering information abnormity on the line loss rate in three dimensions of intervals, indexes and ledgers, and timely finding abnormal metering information which causes the unreasonable line loss rate; on the power supply side, the bus balance rate is combined, and metering information abnormal characteristics are searched from the three aspects of ammeter numbers, metering rheology and communication information; and starting from the meter-circuit relationship and metering rheological information of the dual-power user at the electricity selling side, identifying and analyzing metering information abnormity of the electricity supply side and the electricity selling side respectively. According to the invention, by searching for the machine account data abnormity of the associated metering electric quantity of the power supply side and the power selling side, the reason for the metering information abnormity of the power supply side and the power selling side is quickly identified from actual line loss analysis, so that the system data accuracy is ensured, and the line loss analysis efficiency and the operability of specific troubleshooting work are improved.

Description

Technical Field

[0001] The present invention belongs to the field of power line loss analysis, and in particular relates to a method for analyzing the impact of abnormal metering information on the supply-sale side on 10kV synchronous line loss. Background Art

[0002] Under the background of "dual carbon" construction, carbon emission reduction, energy conservation and consumption reduction, and ecological environment protection have become the focus of national attention.

[0003] The energy loss caused by the transmission of electric energy through transmission lines is referred to as line loss.

[0004] Line loss can directly reflect the losses in each link of power grid operation, and its effective management is related to the sustainable development of energy and environment.

[0005] Reducing line losses, saving energy and improving the efficiency of power transmission are one of the main contents of the operation and management of the power supply department.

[0006] At present, the power supply department has fully launched the work of managing synchronous line losses. With the overall increase in the line loss rate of the distribution network, it is particularly important to standardize the management of 10 kV synchronous line losses and ensure the accuracy and authenticity of the data.

[0007] In the paper "Research on Automatic Detection Method of Line Loss Fault of Electric Power Information Collection Equipment" (Ran Yi, Liu Xiaojian, Dong Liang, et al. Automation and Instrumentation, 2019(12):162-165.), an automatic detection algorithm is proposed to solve the problem of inaccurate detection in the fault management process of electric power information collection equipment. However, its technical solution only targets the fault of the collection equipment and does not discuss the ledger information related to the collection.

[0008] In the paper "Research on line no-load and light-load losses based on synchronous line loss system" (Xu Xiaomeng, Zhao Binbin, Shi Lei, et al. Automation and Instrumentation, 2020(02):155-158.), a line no-load and light-load loss model based on synchronous line loss system was studied to reduce the power loss during line transmission. Since it focuses on theoretical analysis and model establishment, and does not consider the impact of metering information in statistical line loss, its actual operability is not strong (especially for power supply networks that have been built and operated).

[0009] The invention patent with the authorization announcement date of 2023.06.20 and the authorization announcement number of CN 110070282 B discloses "a method for analyzing the influencing factors of line loss in low-voltage substations based on comprehensive correlation", which includes the following processes: determining the influencing factors of substation line loss and classifying the influencing factors; obtaining multiple historical sample data of each influencing factor and standardizing the data of each influencing factor; using Spearman correlation, grey correlation, and cosine correlation methods to evaluate the correlation between the influencing factors and the substation line loss, and obtaining three evaluation values ​​corresponding to each influencing factor; according to the category and evaluation value of the influencing factor, calculating the comprehensive correlation evaluation value of the influencing factor, and determining the degree of influence of the influencing factor on the substation line loss based on the comprehensive correlation evaluation value. This technical solution realizes the quantitative analysis of the influencing factors of the theoretical line loss in the low-voltage substation, and obtains the comprehensive correlation analysis by combining multiple correlation analysis methods, which provides an analytical basis for the theoretical line loss estimation and improves the accuracy of the theoretical line loss estimation. However, this technical solution focuses on evaluating the correlation between various influencing factors and line losses in the substation area from outside the power supply grid, and also does not involve issues related to abnormal metering information.

[0010] The invention patent with the authorization announcement date of 2023.06.02 and the authorization announcement number of CN 111552911 B discloses "a quantitative analysis method of technical line loss influencing factors based on multi-scenario generation", including: firstly, determining the influencing factors of technical line loss and constructing an index system of technical line loss influencing factors; then, using multi-scenario generation technology to generate load and wind and solar output scenarios; then, based on the generated load and wind and solar output scenarios, randomly changing the data of technical line loss influencing factors to generate a sample data set of technical line loss influencing factors; secondly, based on the sample data set of technical line loss influencing factors, using neural networks to establish a calculation model of technical line loss influencing factors; finally, constructing a technical line loss influencing factor analysis scenario, analyzing the degree of technical line loss change under different technical line loss influencing factor analysis scenarios, and thus obtaining the main influencing factors and their synergistic factors with a greater degree of influence on technical line loss. This technical solution realizes the quantitative analysis of the influencing factors of technical line loss, which is convenient for taking targeted energy-saving and loss-reducing measures for the power grid. However, it focuses on the collection and analysis of technical line losses, and the establishment of a calculation model for factors affecting technical line losses. It belongs to theoretical line loss estimation and still fails to take into account the impact of deviations in metering information in statistical line losses on line losses.

[0011] At the same time, none of the above journal articles and patent documents discuss the problem of effective identification of metering information anomalies in line loss calculation. Summary of the invention

[0012] The technical problem to be solved by the present invention is to provide a method for analyzing the impact of abnormal metering information on the power supply-sales side on the 10kV synchronous line loss. Starting from the 10kV branch line topology, with three dimensions of interval, index and ledger, it combines the bus balance rate on the power supply side, and starts from the three aspects of meter number, metering flow and communication information; on the power sales side, it starts from the meter-line relationship and metering flow information of dual power users, and identifies and analyzes them respectively, and gives a method for abnormal identification. This analysis method is highly operational, can quickly identify metering information with abnormal ledgers, standardize system data quality, effectively improve the data quality of the power supply management system, and help ensure the safe operation of the power grid.

[0013] The technical solution of the present invention is to provide a method for analyzing the impact of abnormal metering information on the supply-sale side on 10kV synchronous line loss, which is characterized by:

[0014] In the data processing process of synchronous line loss calculation, starting from the 10kV branch line topology structure, the three dimensions of interval, index and ledger are used to find abnormal metering information that affects the line loss rate, and a quantitative model of the impact of abnormal metering information on the line loss rate is constructed. Through the three-dimensional indicators of the synchronous line loss rate of each branch line, the abnormal metering information that causes unreasonable line loss rate is discovered in time;

[0015] On the power supply side, based on the power supply side metering information and combined with the bus balance rate, start from the three aspects of meter number, metering flow and communication information to find abnormal metering information characteristics;

[0016] On the electricity sales side, based on the metering information of dual power users on the electricity sales side, starting from the meter-line relationship and metering flow information of dual power users, the metering information anomalies on the supply and sales sides are identified and analyzed respectively;

[0017] By finding abnormalities in the ledger data of the related metered electricity on the power supply side and the power sales side, and starting from the actual line loss analysis, the causes of abnormal metering information on the power supply and sales side can be quickly identified, ensuring the accuracy of system data, improving the efficiency of line loss analysis and the operability of specific troubleshooting work.

[0018] Specifically, the three-dimensional indicator of the line loss rate of the same period of the sub-line characterizes the ledger influencing factors in its calculation through three dimensions: interval, indicator and ledger.

[0019] Specifically, the calculation formula for the line loss rate of the branch line during the same period is:

[0020]

[0021] In the formula, μ xs is the line loss rate; W o It refers to the electricity sales side of the line.

[0022] When the line loss rate of the branch line is μ xs∈[0,6%], it is within a reasonable range;

[0023] When the line loss rate of a branch line exceeds a reasonable range, it proves that there is abnormality in the metering information on the supply and sales side of the power supply line of the branch line.

[0024] Furthermore, the busbar balance rate calculation formula is as follows:

[0025]

[0026] In the formula, μ MP is the busbar balance rate; W ZB Main transformer capacity; W XL is the line power; i is the i-th main transformer, i=1,2,...,n; k is the k-th line, k=1,2,...,n;

[0027] When the busbar balance rate μ MP ∈[-2%,2%], it is within a reasonable range;

[0028] When the 10kV busbar balance rate of a substation exceeds a reasonable range, it proves that there is abnormal metering information within the power supply range of the substation.

[0029] Furthermore, if the 10kV bus in the substation is divided into multiple sections, the bus balance rate of each section bus is counted for judgment. The calculation formula of the bus balance rate of each section bus is as follows:

[0030]

[0031] Where m is the mth section of 10kV busbar in the substation, m = 1, 2, ..., L, L max =4;

[0032] If the segment bus voltage μ of the mth section 10kV busbar is MPm If it exceeds the range of [-2%, 2%], the mother level of the mth segment is judged to be unreasonable.

[0033] Specifically, on the power supply side, the power supply side of the 10kV line is measured by installing an energy meter on site, debugging the communication, recording information including the model, wiring method, and meter number of the energy meter, and entering it into the energy collection system to measure the power;

[0034] The formula for calculating the amount of electricity in the energy meter is as follows:

[0035] W XL =(A S -A X )×K

[0036] In the formula, A S A is the bottom value of the electric energy meter;X is the bottom value on the electric energy meter; K is the metering flow rate multiplier.

[0037] Specifically, the abnormal characteristics of metering information on the power supply side include:

[0038] 2.1) The meter number of the energy meter is wrong;

[0039] The meter number error of the electric energy meter is further divided into a single meter number error and multiple meter number errors;

[0040] For single meter number errors, it is necessary to check the meter number corresponding to the communication red dot line on site and correct it in the electrical acquisition system;

[0041] If multiple meter number errors occur, the meters need to be swapped on site and the corresponding COM ports in the electrical acquisition system need to be swapped.

[0042] 2.2) The metering rheology ratio is wrong;

[0043] For metering rheological ratio errors, it is necessary to check the rheological ratio on site and make corrections in the electrical sampling system;

[0044] 2.3) Communication information error;

[0045] In case of communication information errors, you need to contact the back-end personnel of the electrical procurement system for debugging.

[0046] Furthermore, the metering information on the power supply and sales side is abnormal, including:

[0047] 1) The meters A and B of dual power supply users are reversed;

[0048] In this case, one method is to start from the ledger system side and replace the associated information in the graphic system, that is, replace the connection between the special transformer and the user point. At this time, the overall information of the two user points in the system is swapped, including the metering point, meter number, rheological ratio, etc.; the other method is to start from the site and swap the two metering meters. At this time, only the meter number information corresponding to the user point in the system is swapped, and the rest of the information remains unchanged;

[0049] 2) Dual power supply user current ratio reverse:

[0050] In this case, the corresponding relationship between the user point and the line is first exchanged through the on-site meter, and then the overall information of the user point is exchanged by changing the connection line between the user point and the special transformer; while ensuring the correct corresponding relationship between the user point and the line, the rheological ratio is exchanged;

[0051] 3) Dual power supply user A and B meters are opposite and the rheological ratio is opposite:

[0052] If the dual power users have inconsistent meter A and meter B and flow rate magnification at the same time, first swap the two flow rates through the source end system, and then handle it according to any method in 1) dual power users meter A and meter B inversion.

[0053] The method for analyzing the influence of abnormal metering information on the power supply-sale side on the 10kV synchronous line loss of the present invention realizes the abnormal identification of metering information on the power supply-sale side through the following steps:

[0054] For the power supply side:

[0055] G1) First determine whether there is a red dot at the corresponding measuring point in the electrical sampling system. If yes, proceed to the next step; if not, proceed to step G3);

[0056] G2) Check whether the meter number and communication information are correct;

[0057] G3) Check whether the whole station's main level is reasonable? If yes, proceed to the next step; if not, proceed to step G2);

[0058] G4) Check if the segmented mother level is reasonable? If yes, proceed to step G6), if not, proceed to the next step;

[0059] G5) Check table number misalignment;

[0060] G6) Check whether the line loss is reasonable? If yes, proceed to step G9), if not, proceed to the next step;

[0061] G7) Is the metering rheology correct? If yes, proceed to step G9), if not, proceed to the next step;

[0062] G8) Check the error of rheological ratio;

[0063] G9) There is no abnormality on the power supply side;

[0064] For the electricity sales side:

[0065] S1) Check whether the dual power supply user A and B meters are reversed? If yes, proceed to the next step, if not, proceed to step S3);

[0066] S2) Check whether the connection between table A and table B is correct?

[0067] S3) Check whether the dual power user ratio is reversed? If yes, proceed to the next step, if not, proceed to step S5);

[0068] S4) First check the rheological ratio of table A and table B, and then check the connection of table A and table B;

[0069] S5) Check the connection status of meters A and B, and at the same time check whether there are red dots at the corresponding measuring points in the electrical acquisition system?

[0070] S6) If there is a red dot at the corresponding measuring point in the electrical acquisition system, execute step G1) and subsequent inspection steps.

[0071] Furthermore, in the process of identifying abnormal metering information on the power supply and sales side, the order of checking the power supply side and the power sales side can be determined according to actual conditions.

[0072] Compared with the prior art, the advantages of the present invention are:

[0073] 1. The technical solution of the present invention starts from the 10kV branch line topology structure, takes the three dimensions of interval, index and ledger, combines the bus balance rate on the power supply side, starts from the three aspects of meter number, metering flow and communication information; starts from the meter-line relationship and metering flow information of dual power users on the power sales side, respectively identifies and analyzes, and provides a method for abnormal identification;

[0074] 2. The technical solution of the present invention, starting from the actual line loss analysis, can quickly identify the cause of abnormal metering information on the power supply and sales side, ensure the accuracy of system data, and improve the efficiency of line loss analysis.

[0075] 3. The technical solution of the present invention identifies the causes of abnormal changes from a multi-dimensional perspective and proposes means and measures to eliminate the faults. It is highly operational and of great significance for strengthening line loss management, improving line loss rationality indicators, and effectively reducing line losses. It can standardize system data quality, effectively improve the data quality of the power supply management system, and help ensure the safe operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 This is a schematic diagram of the topological structure of the 10kV branch line;

[0077] Figure 2 This is a schematic diagram of the relationship between medium voltage user lines and transformers;

[0078] Figure 3 It is a block diagram of the abnormal identification process of metering information on the supply-sale side of the present invention;

[0079] Figure 4 Schematic diagram of primary wiring of XY station in the embodiment. DETAILED DESCRIPTION

[0080] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0081] Line loss (abbreviated as line loss) is used to characterize all power losses from the primary side of the main transformer to the user's power meter.

[0082] The line loss rate cannot be directly measured, and is calculated by subtracting the power supply from the power sales. The specific calculation formula is:

[0083]

[0084] For the 10kV branch line loss rate, the power supply is the metered power of the 10kV outgoing switch of the substation, and the power sales cover all power loads of the same voltage level of the 10kV line, including the power of 10k pole transformers, distribution transformers, and medium-voltage large users.

[0085] The reasonable range of the line loss rate of a 10kV line is [0,6%]; when the line loss rate is within the reasonable range, it means that each acquisition, association, and calculation link is normal, and the line loss rate is within its inherent loss range; when the line loss rate exceeds the reasonable range, it means that the line loss rate exceeds the inherent loss range of the line, and it is necessary to check the abnormal factors in each acquisition, association, and calculation link.

[0086] Metering electricity consumption on the power supply and sales sides is an important part of calculating 10kV line losses in the same period. In addition to problems such as inaccurate detection of electricity collection equipment, the ledger information associated with metering is also directly related to the accuracy of line loss calculations. However, the ledger data is complex and heterogeneous, making it difficult to troubleshoot, and there is no discussion of related issues.

[0087] The reasons for the abnormal line loss rate of 10kV branch lines can be divided into three aspects: power supply side, topology relationship and power sales side. Therefore, when analyzing line loss, according to the abnormal line loss rate, analyze the power supply side, topology relationship and power sales side one by one to find out the possible abnormal reasons and the corresponding system data problems.

[0088] 1. Impact of abnormal metering information on line loss rate:

[0089] 10kV branch line topology structure Figure 1 As shown, the 10kV outgoing line of the substation is sent to the substation area and medium voltage users.

[0090] In addition to the branch line loss rate, the 10kV bus balance rate (abbreviated as bus balance) of the substation to which the line belongs is also one of the assessment indicators.

[0091] Figure 1 The calculation formula for 10kV busbar balance rate is as follows:

[0092]

[0093] In the formula, μ MP is the busbar balance rate; W ZB Main transformer capacity; W XL is the line power; i is the i-th main transformer, i=1,2,...,n; k is the k-th line, k=1,2,...,n.

[0094] In words:

[0095] Bus power imbalance rate = (input bus power - output bus power) / input bus power × 100%.

[0096] When the busbar balance rate μ MP ∈[-2%,2%], it is within a reasonable range.

[0097] Calculation formula for line loss rate of branch lines in the same period:

[0098]

[0099] In the formula, μ xs is the line loss rate; W o It refers to the electricity sales side of the line.

[0100] When the line loss rate of the branch line is μ xs ∈[0,6%], it is within a reasonable range.

[0101] In the calculation of 10kV branch line loss, the metering information associated with the power supply and sales sides is consistent with the corresponding lines, which is an important link to ensure a reasonable line loss rate.

[0102] Metering information includes metering flow, meters, communication information, etc. Any abnormality in any part will lead to unreasonable line loss rate.

[0103] The line loss rate of the branch line during the same period can be characterized by the three dimensions of interval, index and ledger in Table 1 to characterize the influencing factors in its calculation.

[0104] Table 1 Three-dimensional indexes of line loss rate in the same period of branch line

[0105]

[0106] This technical solution mainly involves the impact of abnormal ledger data of metered electricity on the power supply side and the power sales side on the line loss rate.

[0107] 2. Power supply side metering information:

[0108] The outgoing electricity meter of the substation measures the electricity on the power supply side of the 10kV line. Generally, after the meter is installed on site and the communication is debugged, the meter model, wiring method, meter number and other information are recorded and entered into the electric energy collection system for electricity measurement.

[0109] The formula for calculating the amount of electricity in the energy meter is as follows:

[0110] W XL =(A S -A X )×K (3)

[0111] In the formula, A S A is the bottom value of the electric energy meter; X is the bottom value on the electric energy meter; K is the metering flow rate multiplier.

[0112] 2.1 The meter number of the energy meter is wrong:

[0113] In the metering information, there is a one-to-one correspondence between the measurement point and the meter number, which is unique. The measurement point is automatically generated with the information corresponding to the circuit breaker. In the calculation of synchronous line loss, it needs to be manually assigned to the line model.

[0114] In this link, a typical situation is table number error.

[0115] 2.1.1 Single table number error:

[0116] If a single meter number error occurs, it will manifest as a communication abnormality in the electric energy collection system (i.e. a red dot will appear, hereinafter referred to as the communication abnormality is referred to as the "red dot"), and the correct power information cannot be obtained.

[0117] At this time, the power on the corresponding line supply side is 0. From equations (1) and (2), we can know that the bus balance rate μ MP >2%; Line loss rate μ xs =-999%.

[0118] In this case, check the meter number corresponding to the red dot communication line on site and correct it in the electrical acquisition system.

[0119] 2.1.2 Multiple table number errors:

[0120] If there are multiple meter number errors, one way is the same as a single meter number error. By observing whether there is a red dot on the electrical sampling system, it can be determined whether the meter number on site is consistent with the system.

[0121] The other is the case of meter number misalignment, that is, the meter number of meter A that should belong to line A is mistakenly entered as meter number of meter B by the system, resulting in misalignment in the calculated power on the power supply sides of lines A and B.

[0122] When there is no abnormality in the amount of electricity sold, the line loss rate μ xsA and line B line loss rate μ xsB One is positive and the other is negative, and the power loss is the same, that is:

[0123]

[0124] Where W xsA is the power loss of line A; W xsB This is the power loss in line B.

[0125] Due to busbar balance rate μ MP What is calculated is the bus balance rate of the entire station (abbreviated as "bus balance"), so in the case of meter number misalignment, the calculated value is still within a reasonable range.

[0126] from Figure 1It can be seen that the 10kV busbar in the substation is divided into multiple sections, so it can be judged by statistically analyzing the bus level of each section (that is, for each section busbar, the bus level of the section busbar is calculated separately). The calculation formula of the section bus level is as follows:

[0127]

[0128] Where m is the mth section of 10kV busbar in the substation, m = 1, 2, ..., L, L max =4.

[0129] If the segment bus voltage μ of the mth section 10kV busbar is MPm If it exceeds the range of [-2%, 2%], the mother level of the mth segment is judged to be unreasonable.

[0130] If the meter number misalignment occurs on different sections of the bus, it can be judged by the section bus level and the line loss rate of the branch line.

[0131] Except for the unreasonable busbar level, the power loss of different busbar sections is the same, that is:

[0132]

[0133] If it occurs on the same section of bus, the line loss rate of the branch line is used to make a judgment in combination with the situation on the power sales side.

[0134] In the case of two meter number errors, the treatment method needs to ensure that the 10kV bus level of the substation is reasonable and the meter does not run backwards. Therefore, the meters are swapped on site, so that the meter numbers in the power acquisition system remain unchanged and there is no need to make meter replacement records. At the same time, the corresponding COM ports are swapped in the system to ensure normal communication, so that the line and bus averages can be restored to a reasonable level.

[0135] When there are 2 or more table number errors, the judgment and treatment methods are the same as above.

[0136] 2.2 Metering rheology ratio error:

[0137] From formula (3), it can be seen that the multiplier of the metering rheometer directly affects the calculation of the amount of electricity. In this link, the typical situation is that due to engineering and other reasons, the on-site rheometer is replaced and the information is inconsistent with the system.

[0138] When the rheological ratio is wrong, the calculated amount of electricity is:

[0139]

[0140] Where W XL ′ is the electric quantity calculated under the wrong rheology ratio; K′ is the wrong rheology ratio.

[0141] If K>K′, then W XL ′>WXL , according to formula (1), μ MP < -2%; according to formula (2), μ xs > 6%;

[0142] Similarly, if K < K′, then W XL ′ < W XL , at this time μ MP > 2%; μ xs < 0.

[0143] In this case, after verifying the rheological magnification on-site, correct it in the electric energy acquisition system.

[0144] 2.3 Communication information error:

[0145] The communication information is manifested as that after the communication channel is debugged on-site and in the background, power consumption data can be obtained in the electric energy acquisition system. When the communication channel is abnormal, red dots will appear in the system.

[0146] In this link, a typical situation is the replacement of the power supply side watt-hour meter and the reconnection of the communication channel, resulting in the inconsistency between the communication acquisition COM port in the electric energy acquisition system and the site.

[0147] At this time, the power supply side power of the corresponding line is 0, μ MP > 2%; μ xs = -999%.

[0148] In this case, contact the background personnel of the electric energy acquisition system for debugging and solution.

[0149] 2.4 Abnormal characteristics and treatment methods of power supply side metering information:

[0150] In the case of abnormal meter numbers, rheology, and communication information of the three typical metering watt-hour meters on the power supply side, their characteristics and treatment methods are shown in Table 2.

[0151] Table 2 Abnormal characteristics and treatment methods of power supply side metering information

[0152]

[0153]

[0154] 3 Metering information of double-power users on the power selling side:

[0155] Medium-voltage users on the power selling side often have double power supplies, that is, there are 2 different metering points for users with the same account number, usually called the first and second meters.

[0156] The typical abnormal situations in this link are the reversal of the first and second meters and the reversal of the rheological magnification. The line transformation relationship between the user point - special transformer - metering point - line is unique, as Figure 2 shown by the black connection line.

[0157] 3.1 Dual power supply user A and B table reverse:

[0158] Assuming that the reverse user flow rate of meter A and meter B is normal, the line loss rate of line A is μ xs甲 The line loss rate μ of line B xs乙 One is positive and the other is negative, and the power loss is the same, the same as formula (4).

[0159] In this case, one approach is to start from the ledger system side and replace the associated information in the graphic system, that is, to replace the connection between the special transformer and the user point ( Figure 2 The other method is to start from the site and swap the two meters (shown by the red line in the middle). At this time, the overall information of the two user points in the system is swapped, including the metering point, meter number, rheological ratio, etc. Figure 2 In this case, only the table number information corresponding to the user point in the system is swapped, and the rest of the information remains unchanged.

[0160] 3.2 Dual power supply user flow rate feedback:

[0161] Assuming that the dual power users have different and opposite flow rates, but the corresponding users A and B are not connected in reverse, then the line loss rate μ of line A is xs甲 The line loss rate μ of line B xs乙 One is positive and the other is negative, but the power loss is inconsistent.

[0162] The restored line loss rate is:

[0163]

[0164] In the formula, μ' xs甲 is the line loss rate of line A at the correct magnification; μ xs甲 is the line loss rate of line A under the error rate; μ' xs乙 is the line loss rate of line B at the correct magnification; μ' xs乙 is the line loss rate of line B under the error rate; W J甲 is the power consumption of user A under the error rate; W J乙 is the power consumption of user B under the error rate; K 甲 is the correct magnification of user A; K 乙 This is the correct magnification for user B.

[0165] At this time, if the method in 3.1 is used to swap, the ratio information cannot be corrected. One method is to swap the ratios of the two rheological parameters directly from the source system. However, in actual work, it is often limited by information such as rheological capacity and cannot be directly replaced. Therefore, the information can be corrected through the following two steps:

[0166] Step 1: Replace the meter on site;

[0167] Step 2: Replace the connection between the user point and the dedicated transformer in the system.

[0168] This method firstly exchanges the correspondence between the user point and the line through the on-site meter, and then exchanges the overall information of the user point by changing the connection line between the user point and the special transformer. In this way, the rheological ratio is exchanged while ensuring the correct correspondence between the user point and the line.

[0169] 3.3 Dual power supply user A and B meters are opposite and the rheological ratio is opposite:

[0170] If the dual power users have the situation that the table A and B are inverted and the rheological ratio is inconsistent at the same time, first swap the two rheological ratios through the source end system, and then use any method in 3.1 to handle it.

[0171] 4. Abnormal identification process of metering information on the supply and sales side:

[0172] Through the above analysis, the identification process of abnormal metering information on the supply-sales side is obtained as follows: Figure 3 as shown in .

[0173] For the power supply side:

[0174] G1) First determine whether there is a red dot at the corresponding measuring point in the electrical sampling system. If yes, proceed to the next step; if not, proceed to step G3);

[0175] G2) Check whether the table number and communication information are correct;

[0176] G3) Check whether the whole station's main level is reasonable? If yes, proceed to the next step; if not, proceed to step G2);

[0177] G4) Check if the segmented mother level is reasonable? If yes, proceed to step G6), if not, proceed to the next step;

[0178] G5) Check table number misalignment;

[0179] G6) Check the line loss. Is it reasonable? If yes, proceed to step G9). If not, proceed to the next step.

[0180] G7) Is the metering rheology correct? If yes, proceed to step G9), if not, proceed to the next step;

[0181] G8) Check the error of rheological ratio;

[0182] G9) There is no abnormality on the power supply side;

[0183] For the electricity sales side:

[0184] S1) Check whether the dual power supply user A and B meters are reversed? If yes, proceed to the next step, if not, proceed to step S3);

[0185] S2) Check whether the connection between table A and table B is correct?

[0186] S3) Check whether the dual power user ratio is reversed? If yes, proceed to the next step, if not, proceed to step S5);

[0187] S4) First check the rheological ratio of table A and table B, and then check the connection of table A and table B;

[0188] S5) Check the connection status of meters A and B, and at the same time check whether there are red dots at the corresponding measuring points in the electrical sampling system?

[0189] S6) If there is a red dot at the corresponding measuring point in the electrical acquisition system, execute step G1) and subsequent inspection steps.

[0190] The order of checking the power supply and sales side can be determined according to the actual situation.

[0191] Example:

[0192] A power supply company analyzed the line loss rate of 10 kV branch lines in the line loss platform of the same period and found that:

[0193] The 10kV branch line "X8 / X58" changed from reasonable to negative loss on August 11; the 10kV branch line "X15 / X65" changed from reasonable to high loss on August 9, and changed from high loss to negative loss on August 11; the 10kV branch line "X23 / 73" changed from reasonable to high loss on July 16;

[0194] The above three double-line lines all belong to the 35 kV substation: XY station. Its topology is as follows Figure 4 shown.

[0195] First, we analyze the 10 kV branch line "X8 / X58". The line loss rate and power consumption changes before and after August 11 are shown in Table 3.

[0196] Table 3 Line loss rate and power consumption changes of “X8 / X58” before and after August 11

[0197] As can be seen from Table 3, since August 11, there has been no significant change in the power supply side of "X8 / X58", while the power sales side has increased by about 1600kWh, resulting in a negative line loss rate. Therefore, we should start with the metering information on the power sales side.

[0198] The power sales side of this line only has three high-voltage users, and their power consumption is shown in Table 4.

[0199] Table 4 Changes in electricity sales volume of “X8 / X58” around August 11

[0200]

[0201]

[0202] From Table 4, we can see that the power consumption measured by the X8 / X58 associated user "Ao Mou Environmental Protection" since August 11 is basically consistent with the line loss power consumption, and the power consumption of the other two users has remained basically unchanged.

[0203] After checking the work plan, it was found that the user was involved in the business expansion project "Shanghai Aomu Environmental Protection Engineering Co., Ltd. XX Road 10kV Quota Project" on July 16, which had dual power supplies, and the other metering point was x9441, involving the line "X15 / X65". At the same time, the multipliers of the two metering points were the same, so it was considered whether there was a situation of reverse meter A and meter B.

[0204] Tracing back the history, it was found that the lines associated with the two metering points of the user in July and August were inconsistent during the same period. From July 16 to August 5, metering point x0031 belonged to line X15 / X65, and x9441 belonged to line X8 / X58; from August 6 to 9, the association was lost due to the drawing of the special transformer; and since August 10, after the association was restored, the associated lines of the two metering points were opposite to before.

[0205] Therefore, it was determined that the dual power user "Ao Mou Environmental Protection" had a reverse phenomenon of table A and table B. After on-site verification, it was confirmed and the connection between the user point and the special transformer in the diagram was replaced.

[0206] After the user's metering information was corrected, the line loss rate of line "X8 / X58" was -165.74%, and the line loss rate of "X15 / X65" was 1.83%. The line loss rate of "X15 / X65" can be restored to a reasonable level, but "X8 / X58" is still negative, or even more negative.

[0207] Further analysis shows that "X8 / X58" is still a negative loss. Checking the metering information on the power supply side, there is no red dot in the power supply system of the power station "XY Station" to which it belongs, and the mother level has always been within a reasonable range, but Figure 4 In the example, "X8 / X58" and "X23 / X73" are not on the same busbar section.

[0208] Calculate the section bus level. Taking August 11 as an example, the XY station bus level is -0.09%, the section bus level is 5.82%, the power loss is 13046kWh, the section bus level is -7.06%, the power loss is -13634.75kWh, and the section bus level exceeds the reasonable range of [-2%, 2%], and the power loss is consistent. Combined with the line loss rate of "X8 / X58" and "X23 / X73", the phenomenon of the misalignment of the two meter numbers in Table 2 is met, so it is judged that the two lines have the opposite meter numbers on the power supply side.

[0209] After on-site verification, it was confirmed that the on-site meter numbers of "X8 / X58" and "X23 / X73" were opposite to those in the power collection system, and the meter readings were interchangeable. After exchanging meters on site and replacing the COM port in the system, the first section bus level of "XY Station" was -0.26%, and the second section bus level was -0.0014%, both within a reasonable range. The line loss rate of "X8 / X58" was 86.45%, and the line loss rate of "X23 / X73" was -618.52%, which was still not within a reasonable range.

[0210] After checking the metering information of the power sales side of the two lines, it was found that "X23 / X73" and the power sales side were only associated with one high-voltage user, number: x4381, name: Shunmou New Materials, metering point number: x7823. The other metering point of this user is just associated with line "X8 / X58", and the rheological ratio is consistent. The loss of the two lines is one positive and one negative, and the loss of electricity is consistent, satisfying formula (4).

[0211] Therefore, it is judged that the dual power supply user "Shun Mou New Materials" has the phenomenon of reverse A and B tables.

[0212] After on-site verification, the corresponding meter information of the two metering points of the user was opposite to that in the system, and the meter was replaced on-site. After the information was corrected, the line loss rate of "X8 / X58" was 1.72% and the line loss rate of "X23 / X73" was 0.93%, both within a reasonable range.

[0213] Based on the above analysis, the three double-spelling lines "X8 / X58", "X15 / X65" and "X23 / 73" had the problem that the A and B meters of the dual power users "Ao Mou Environmental Protection" and "Shun Mou New Materials" were reversed, and the power supply side meters of "X8 / X58" and "X23 / X73" were reversed. After the processing, the line loss rates were restored to a reasonable range.

[0214] Actual cases have verified the effectiveness of this identification and governance method.

[0215] To further verify the practicability of this method, the 10kV branch lines with unreasonable line loss rates in a certain month were analyzed, and the results are shown in Table 5.

[0216] Table 5 Analysis of abnormal reasons for 10kV branch line metering information in a certain month

[0217]

[0218] It can be seen from the analysis results of multiple cases that the technical solution of the present invention, starting from the actual line loss analysis, can quickly identify the cause of abnormal metering information on the power supply and sales side, ensure the accuracy of system data, and improve the efficiency of line loss analysis.

[0219] In summary, the method for troubleshooting abnormal metering information on the power supply and sales side of the present invention has the following characteristics:

[0220] 1) From the three dimensions of interval, index and ledger, a quantitative model for the impact of abnormal metering information on line loss rate is proposed;

[0221] 2) The power supply side combines the bus balance rate to find abnormal characteristics of metering information from three aspects: meter number, metering flow and communication information; the power sales side starts from the meter-line relationship and metering flow information of dual power users to find abnormal characteristics of metering information; the operability of the troubleshooting method is improved;

[0222] 3) An analysis method for typical metering information anomalies on the power supply and sales side is proposed, which can effectively improve the system data quality.

[0223] The technical solution of the present invention analyzes the power supply side, topology relationship and power sales side in turn, quickly and accurately locates the abnormal data at the source of the system, and makes the line loss rate reach a reasonable range through the rectification of the abnormal data of the system. The analysis method is highly operable, effectively improves the quality of system data, and ensures the safe operation of the power grid.

[0224] The technical solution of the present invention can improve the efficiency of eliminating abnormal line loss rates of branch lines, more effectively solve record problems and on-site problems, and improve the economic efficiency of power grid operation.

[0225] The present invention can be widely used in the fields of operation management and line loss analysis of 10kV power supply systems.

Claims

1. A method for analyzing the impact of abnormal metering information on the power supply-sales side on 10kV synchronous line loss, characterized by: In the data processing process of synchronous line loss calculation, starting from the 10kV branch line topology structure, the three dimensions of interval, index and ledger are used to find abnormal metering information that affects the line loss rate, and a quantitative model of the impact of abnormal metering information on the line loss rate is constructed. Through the three-dimensional indicators of the synchronous line loss rate of each branch line, the abnormal metering information that causes unreasonable line loss rate is discovered in time; On the power supply side, based on the power supply side metering information and combined with the bus balance rate, start from the three aspects of meter number, metering flow and communication information to find abnormal metering information characteristics; On the electricity sales side, based on the metering information of dual power users on the electricity sales side, starting from the meter-line relationship and metering flow information of dual power users, the metering information anomalies on the supply and sales sides are identified and analyzed respectively; By finding abnormalities in the ledger data of the related metered electricity on the power supply side and the power sales side, and starting from the actual line loss analysis, the causes of abnormal metering information on the power supply and sales side can be quickly identified, ensuring the accuracy of system data, improving the efficiency of line loss analysis and the operability of specific troubleshooting work.

2. The method for analyzing the impact of abnormal metering information on the supply-sale side on 10kV synchronous line loss according to claim 1 is characterized in that The three-dimensional indicator of the line loss rate of the same period of the sub-line is characterized by the three dimensions of interval, indicator and ledger to characterize the ledger influencing factors in its calculation.

3. The method for analyzing the impact of abnormal metering information on the supply-sale side on 10kV synchronous line loss according to claim 1 is characterized in that The calculation formula of the line loss rate of the branch line in the same period is: In the formula, μ xs is the line loss rate; W o It refers to the electricity sales side of the line. When the line loss rate of the branch line is μ xs ∈[0,6%], it is within a reasonable range; When the line loss rate of a branch line exceeds a reasonable range, it proves that there is abnormality in the metering information on the supply and sales side of the power supply line of the branch line.

4. The method for analyzing the impact of abnormal metering information on the supply-sale side on 10kV synchronous line loss according to claim 1 is characterized in that The busbar balance rate calculation formula is as follows: In the formula, μ MP is the busbar balance rate; W ZB Main transformer capacity; W XL is the line power; i is the i-th main transformer, i=1,2,...,n; k is the k-th line, k=1,2,...,n; When the busbar balance rate μ MP ∈[-2%,2%], it is within a reasonable range; When the 10kV busbar balance rate of a substation exceeds a reasonable range, it proves that there is abnormal metering information within the power supply range of the substation.

5. The method for analyzing the impact of abnormal metering information on the supply-sale side on 10kV synchronous line loss according to claim 1 is characterized in that If the 10kV bus in the substation is divided into multiple sections, the bus balance rate of each section bus is counted for judgment. The calculation formula of the bus balance rate of each section bus is as follows: Where m is the mth section of 10kV busbar in the substation, m = 1, 2, ..., L, L max =4; If the segment bus voltage μ of the mth section 10kV busbar is MPm If it exceeds the range of [-2%, 2%], the mother level of the mth segment is judged to be unreasonable.

6. The method for analyzing the influence of abnormal metering information on the power supply-sales side on the 10kV line loss in the same period according to claim 1 is characterized in that on the power supply side, the power supply side of the 10kV line is measured by installing an energy meter on site, debugging the communication, recording information including the model, wiring method, and meter number of the energy meter, and entering it into the energy collection system to measure the power; The formula for calculating the amount of electricity in the energy meter is as follows: W XL =(A S -A X )×K In the formula, A S A is the bottom value of the electric energy meter; X is the bottom value on the electric energy meter; K is the metering flow rate multiplier.

7. The method for analyzing the impact of abnormal metering information on the supply-sale side on 10kV synchronous line loss according to claim 1 is characterized in that Abnormal characteristics of metering information on the power supply side include: 7.1) The meter number of the energy meter is wrong; The meter number error of the electric energy meter is further divided into a single meter number error and multiple meter number errors; For single meter number errors, it is necessary to check the meter number corresponding to the communication red dot line on site and correct it in the electrical acquisition system; If multiple meter number errors occur, the meters need to be swapped on site and the corresponding COM ports in the electrical acquisition system need to be swapped. 7.2) The metering rheology ratio is wrong; For metering rheological ratio errors, it is necessary to check the rheological ratio on site and make corrections in the electrical sampling system; 7.3) Communication information error; In case of communication information errors, you need to contact the back-end personnel of the electrical procurement system for debugging.

8. The method for analyzing the impact of abnormal metering information on the supply-sale side on 10kV synchronous line loss according to claim 1 is characterized in that The abnormal metering information on the supply-sales side includes: 8.1) The meters of dual power supply users A and B are reversed; In this case, one method is to start from the ledger system side and replace the associated information in the graphic system, that is, replace the connection between the special transformer and the user point. At this time, the overall information of the two user points in the system is swapped, including the metering point, meter number, rheological ratio, etc.; the other method is to start from the site and swap the two metering meters. At this time, only the meter number information corresponding to the user point in the system is swapped, and the rest of the information remains unchanged; 8.2) Dual power supply user current ratio feedback: In this case, the corresponding relationship between the user point and the line is first exchanged through the on-site meter, and then the overall information of the user point is exchanged by changing the connection line between the user point and the special transformer; while ensuring the correct corresponding relationship between the user point and the line, the rheological ratio is exchanged; 8.3) Dual power supply user A and B meters are opposite and the rheological ratio is opposite: If the dual power users have inconsistent meter A and meter B and rheological magnification at the same time, first swap the two rheological magnifications through the source end system, and then handle it according to any method in 8.1) Dual power users meter A and meter B inversion.

9. The method for analyzing the impact of abnormal metering information on the supply-sale side on 10kV synchronous line loss according to claim 1, characterized in that The analysis method of the influence of abnormal metering information on the power supply and sales side on the 10kV synchronous line loss is implemented by the following steps to identify abnormal metering information on the power supply and sales side: For the power supply side: G1) First determine whether there is a red dot at the corresponding measuring point in the electrical sampling system. If yes, proceed to the next step; if not, proceed to step G3); G2) Check whether the table number and communication information are correct; G3) Check whether the whole station's main level is reasonable? If yes, proceed to the next step; if not, proceed to step G2); G4) Check if the segmented mother level is reasonable? If yes, proceed to step G6), if not, proceed to the next step; G5) Check table number misalignment; G6) Check whether the line loss is reasonable? If yes, proceed to step G9), if not, proceed to the next step; G7) Is the metering rheology correct? If yes, proceed to step G9), if not, proceed to the next step; G8) Check the error of rheological ratio; G9) There is no abnormality on the power supply side; For the electricity sales side: S1) Check whether the dual power supply user A and B meters are reversed? If yes, proceed to the next step, if not, proceed to step S3); S2) Check whether the connection between table A and table B is correct? S3) Check whether the dual power user ratio is reversed? If yes, proceed to the next step, if not, proceed to step S5); S4) First check the rheological ratio of table A and table B, and then check the connection of table A and table B; S5) Check the connection status of meters A and B, and at the same time check whether there are red dots at the corresponding measuring points in the electrical acquisition system? S6) If there is a red dot at the corresponding measuring point in the electrical acquisition system, execute step G1) and subsequent inspection steps.

10. The method for analyzing the impact of abnormal metering information on the supply-sale side on 10kV synchronous line loss according to claim 9, characterized in that In the process of identifying abnormal metering information on the power supply and sales side, the order of checking the power supply side and the power sales side can be determined according to the actual situation.

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