A method for judging the error type of line-transformer relationship in a transformer area

Abstract

The present invention provides a method for determining the type of error in the relationship between a transformer and a line, comprising the following steps: A. acquiring transformer-related data and preprocessing the data; B. calculating transformer and line classification marks according to the data preprocessed in step A; C. calculating the maximum similarity of the transformer according to the transformer and line classification marks calculated in step B; D. determining the type of error in the relationship between a transformer and a line according to the calculation result of step C. The method for determining the type of error in the relationship between a transformer and a line provided by the present invention can provide a data basis for the verification of the relationship between a transformer and a line.

Description

Technical Field

[0001] The invention relates to the technical field of power distribution networks, and in particular to a method for determining the type of line-transformer relationship errors in a transformer area. Background Art

[0002] The line-transformer relationship of the distribution network is a very important basic data. When the line-transformer relationship is wrong, it will directly affect the line loss calculation, power outage management and the operation and maintenance of the distribution network line. In order to verify the correctness of the line-transformer relationship, the traditional manual method is used, but it is time-consuming and labor-intensive and difficult to ensure real-time performance. The operation of the distribution network will generate a large amount of operation data. By analyzing and mining this data, it can be used to carry out automatic verification of the line-transformer relationship of the distribution network.

[0003] When the line-to-substation relationship in a substation area is incorrect, the substation to which the correct line belongs may or may not be the same as the original substation.

[0004] The Chinese patent "Line-to-Transformer Relationship Identification System" with publication number CN 201911283816.9 includes a line-to-transformer relationship identification master station, a line-to-transformer relationship analysis machine, and a line-to-transformer relationship identification terminal; the line-to-transformer relationship identification master station notifies the line-to-transformer relationship identification terminal on the low-voltage side of the distribution transformer to send an ultra-low frequency carrier signal; the line-to-transformer relationship analysis machine at the head end of the substation line detects the characteristic signal; the line-to-transformer relationship analysis machine uploads the signal characteristics to the line-to-transformer relationship identification master station; the line-to-transformer relationship identification master station determines the line ownership of the transformer through comprehensive comparison. The Chinese invention patent "A Line-to-Transformer Relationship Identification Method" with publication number CN202120149670.X, the master station sends an identification command to the corresponding line-to-transformer terminal through a 4G signal; after receiving the command, the line-to-transformer terminal sends an identification signal to the 10kV power line; after receiving the power line signal, the line-to-transformer relationship analysis machine reports it to the master station through a 4G signal; the master station determines the line-to-transformer relationship through the corresponding relationship between the line-to-transformer terminal and the line-to-transformer relationship analysis machine.

[0005] Although the above patents involve the verification of the line-transformer relationship in the substation, they all require additional installation of devices to implement them, and do not involve the judgment of the type of line-transformer relationship errors. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method for determining the error type of line-to-transformer relationship in a substation, which can provide a data basis for verifying the line-to-transformer relationship.

[0007] The technical solution adopted by the present invention is:

[0008] A method for determining the type of line-to-transformer relationship error in a transformer area comprises the following steps:

[0009] A. Obtain relevant data of the substation area and pre-process the data;

[0010] B. Calculate the area and line classification marks based on the data preprocessed in step A;

[0011] C. Calculate the maximum similarity of the substations according to the substation and line classification marks calculated in step B;

[0012] D. According to the maximum similarity of the substation area calculated in step C, determine the type of error in the substation line change relationship.

[0013] Furthermore, step A obtains the relevant data of the substation area and pre-processes the data, specifically:

[0014] The substation-related data include: the correspondence between substation, 10kV line and substation, substation name, substation address code, and 96-point voltage data at the substation exit.

[0015] The data is preprocessed, including the calculation of the voltage data of 96 points at the outlet of the substation, selecting a reference substation in each line, and calculating the similarity of the voltage curves of other substations of the line with the reference substation on a line-by-line basis. Assume that a 10kV line has N substations, namely TQ 1 ,TQ 2 ,TQ 3 ,…,TQ N , if the Taiwan area TQ 2 For the reference area, TQ is calculated separately 1 ,TQ 3 ,TQ 4 ,…,TQ N With Taiwan Area TQ 2 Similarity of voltage curves.

[0016] Furthermore, in step B, the station area and line classification marks are calculated according to the data preprocessed in step A, specifically:

[0017] Assume that M days of data have been collected, there are P substations, Q 10kV lines, and the substation is denoted by S 1 ,S 2 ,…,S P , 10kV line is marked as L 1 ,L 2 ,…,L Q If for line L q , which belongs to substation S p , the line has a total of N stations, denoted by TQ 1 ,TQ 2 ,TQ 3 ,…,TQ N , if the Taiwan area TQ 2 The TQ of other stations under the line and the reference station area are calculated for M days. 2 The voltage curve similarity of , the similarity calculation result is:

[0018]

[0019] If the data of the mth terrace area n is missing in the similarity calculation result, let SI n,m Is a null value. According to the similarity calculation results, calculate the similarity mark matrix. If SI n,m Non-empty cut SI n,m >YZ, then let SIB n,m =1, otherwise SIB n,m =0, if SI n,m If it is null, let SIB n,m Is a null value, where YZ represents the similarity threshold, 1≤n≤N, 1≤m≤M. After completing the above calculation, the similarity mark matrix is ​​obtained:

[0020]

[0021] Calculate the station area classification mark based on the similarity mark matrix:

[0022] make For the nth station area, if SIB n,m =1, then let JH = JH + 1, otherwise let JS = JS + 1, where the initial values ​​of JH and JS are both 0. After completing the calculation for M days, if JH / (JH + JS) ≥ 0.8, then let SIBT n =1, otherwise SIBT n =2, where SIBT n Indicates the classification mark of the nth station area.

[0023] According to the above method, the classification marks of all substations are calculated. If 1≤n≤N, there is SIBT n =1, then let BL q =1, otherwise BL q =2, where BL q For line L q Classification mark.

[0024] Furthermore, in step C, the maximum similarity of the substations is calculated according to the substation and line classification marks calculated in step B, specifically:

[0025] If line L q Classification mark BL q =1, the maximum correlation coefficient of the substation is not calculated, and the substation line-change relationship under this line is correct;

[0026] If line L q Classification mark BL q =2, line L q The included area is TQ 1 ,TQ 2 ,TQ3 ,…,TQ N , L q The substation it belongs to is S p , since line L q The stations in the system are divided into two categories. One station is randomly selected from each category and recorded as TQ n , TQ n+1 , where TQ n The station classification mark is 1, TQ n+1 The station area classification mark is 2. Calculate TQ n , TQ n+1 With line set L 1 ,L 2 ,…,L Q (excluding L q ) and record the voltage curve similarity of all substations in the same substation, and the substation with the largest similarity and its corresponding lines and substations.

[0027] Complete the calculation of M days, including TQ n The substation corresponding to the area with the greatest similarity is recorded as:

[0028] TQS n =[TQS n,1 ,TQS n,2 ,…,TQS n,M ]

[0029] With Taiwan Area TQ n+1 The substation corresponding to the area with the greatest similarity is recorded as:

[0030] TQS n+1 =[TQS n+1,1 ,TQS n+1,2 ,…,TQS n+1,M ]

[0031] TQS n,m Indicates the mth day and the TQ of the area n The substation corresponding to the area with the greatest similarity.

[0032] Furthermore, in step D, the error type of the line-variable relationship of the substation area is judged according to the maximum similarity of the substation area calculated in step C, specifically:

[0033] TQS for the set n and TQS n+1 Analysis of substations in:

[0034] 1) If the set TQS n The largest number of substations and lines L q The substations they belong to are all S p , Substation S pThe number of NS n,p , and NS n,p / M≥0.8; if the set TQS n+1 The largest number of substations and lines L q The substations they belong to are all S p , Substation S p The number of NS n+1,p , and NS n+1,p / M≥0.8, it means that line L q The line relationship is wrong, and it is error type 1 "Line-transformer relationship is wrong, two types of substations belong to different lines of the same substation."

[0035] 2) If the set TQS n The largest number of substations and lines L q The substations they belong to are all S p , Substation S p The number of NS n,p , and NS n,p / M≥0.8; if the set TQS n+1 The largest number of substations and lines L q The substations they belong to are inconsistent. p+1 , Substation S p+1 The number of NS n+1,p+1 , and NS n+1,p+1 / M≥0.8, it means that line L q The line relationship is wrong, and the error type is 2 "Line-to-substation relationship error, two types of substations belong to lines in different substations", and the set TQS n+1 The line change relationship in the station area is wrong.

[0036] The present invention obtains the voltage data of 96 points at the outlet of the substation, calculates the substation and line classification marks after preprocessing, and then calculates the maximum similarity of the substation, and then judges the error type of the line-transformer relationship in the substation according to the maximum similarity of the substation. Compared with the prior art, it does not need to install other devices additionally, and the implementation is simple and fast. The judgment result of the present invention is verified to be highly accurate through actual on-site operation and maintenance, and can provide a data basis for the verification of the line-transformer relationship. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a flow chart of one embodiment of a method for determining the type of line-to-transformer relationship error in a substation according to the present invention. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0039] See also Figure 1, is a flow chart of one embodiment of a method for determining the type of line-to-transformer relationship error in a transformer area according to the present invention, the method comprising the following steps:

[0040] A. Obtain relevant data of the substation area and pre-process the data, specifically:

[0041] The substation-related data include: the correspondence between substation, 10kV line and substation, substation name, substation address code, and 96-point voltage data at the substation exit.

[0042] The data is preprocessed, including the calculation of the voltage data of 96 points at the outlet of the substation, selecting a reference substation in each line, and calculating the similarity of the voltage curves of other substations of the line with the reference substation on a line-by-line basis. Assume that a 10kV line has N substations, namely TQ 1 ,TQ 2 ,TQ 3 ,…,TQ N , if the Taiwan area TQ 2 For the reference area, TQ is calculated separately 1 ,TQ 3 ,TQ 4 ,…,TQ N With Taiwan Area TQ 2 Similarity of voltage curves.

[0043] B. Calculate the area and line classification marks based on the data preprocessed in step A, specifically:

[0044] Assume that M days of data have been collected, there are P substations, Q 10kV lines, and the substation is denoted by S 1 ,S 2 ,…,S P , 10kV line is marked as L 1 ,L 2 ,…,L Q If for line L q , which belongs to substation S p , the line has a total of N stations, denoted by TQ 1 ,TQ 2 ,TQ 3 ,…,TQ N , if the Taiwan area TQ 2 The TQ of other stations under the line and the reference station area are calculated for M days. 2 The voltage curve similarity of , the similarity calculation result is:

[0045]

[0046] If the data of the mth terrace area n is missing in the similarity calculation result, let SI n,mIs a null value. According to the similarity calculation results, calculate the similarity mark matrix. If SI n,m Non-empty cut SI n,m >YZ, then let SIB n,m =1, otherwise SIB n,m =0, if SI n,m If it is null, let SIB n,m Is a null value, where YZ represents the similarity threshold, 1≤n≤N, 1≤m≤M. After completing the above calculation, the similarity mark matrix is ​​obtained:

[0047]

[0048] Calculate the station area classification mark based on the similarity mark matrix:

[0049] make For the nth station area, if SIB n,m =1, then let JH = JH + 1, otherwise let JS = JS + 1, where the initial values ​​of JH and JS are both 0. After completing the calculation for M days, if JH / (JH + JS) ≥ 0.8, then let SIBT n =1, otherwise SIBT n =2, where SIBT n Indicates the classification mark of the nth station area.

[0050] According to the above method, the classification marks of all substations are calculated. If 1≤n≤N, there is SIBT n =1, then let BL q =1, otherwise BL q =2, where BL q For line L q Classification mark.

[0051] C. Calculate the maximum similarity of the area according to the area and line classification signs calculated in step B, specifically:

[0052] If line L q Classification mark BL q =1, the maximum correlation coefficient of the substation is not calculated, and the substation line-change relationship under this line is correct;

[0053] If line L q Classification mark BL q =2, line L q The included area is TQ 1 ,TQ 2 ,TQ 3 ,…,TQ N , L q The substation it belongs to is S p , since line L qThe stations in the system are divided into two categories. One station is randomly selected from each category and recorded as TQ n , TQ n+1 , where TQ n The station classification mark is 1, TQ n+1 The station area classification mark is 2. Calculate TQ n , TQ n+1 With line set L 1 ,L 2 ,…,L Q (excluding L q ) and record the voltage curve similarity of all substations in the same substation, and the substation with the largest similarity and its corresponding lines and substations.

[0054] Complete the calculation of M days, including TQ n The substation corresponding to the area with the greatest similarity is recorded as:

[0055] TQS n =[TQS n,1 ,TQS n,2 ,…,TQS n,M ]

[0056] With Taiwan Area TQ n+1 The substation corresponding to the area with the greatest similarity is recorded as:

[0057] TQS n+1 =[TQS n+1,1 ,TQS n+1,2 ,…,TQS n+1,M ]

[0058] TQS n,m Indicates the mth day and the TQ of the area n The substation corresponding to the area with the greatest similarity.

[0059] D. According to the calculation results of step C, the error type of the transformer relationship in the substation area is judged, specifically:

[0060] TQS for the set n and TQS n+1 Analysis of substations in:

[0061] 1) If the set TQS n The largest number of substations and lines L q The substations they belong to are all S p , Substation S p The number of NS n,p , and NS n,p / M≥0.8; if the set TQS n+1 The largest number of substations and lines L qThe substations they belong to are all S p , Substation S p The number of NS n+1,p , and NS n+1,p / M≥0.8, it means that line L q The line relationship is wrong, and it is error type 1 "Line-transformer relationship is wrong, two types of substations belong to different lines of the same substation."

[0062] 2) If the set TQS n The largest number of substations and lines L q The substations they belong to are all S p , Substation S p The number of NS n,p , and NS n,p / M≥0.8; if the set TQS n+1 The largest number of substations and lines L q The substations they belong to are inconsistent. p+1 , Substation S p+1 The number of NS n+1,p+1 , and NS n+1,p+1 / M≥0.8, it means that line L q The line relationship is wrong, and the error type is 2 "Line-to-substation relationship error, two types of substations belong to lines in different substations", and the set TQS n+1 The line change relationship in the station area is wrong.

[0063] The technical solution and effects of the present invention are described in detail below with a specific embodiment:

[0064] Step A, obtain the relevant data of the substation, the data time range is 10 days, and the following table shows the sample data (taking user i as an example). According to the obtained data, the substation outlet voltage is calculated, the reference substation is selected, and the similarity of the substation voltage curve is calculated.

[0065]

[0066]

[0067] Step B, based on the pre-processed data, calculate the station area and line classification marks, the calculation results are as follows (taking line L as an example) 1 For example, this line has 19 substations, and the substation to which this line belongs is QJS). It can be seen that the classification mark of this line is 2, and the substations of this line are divided into two categories, NP18 is one category, and other substations are another category.

[0068]

[0069] Step C, based on the calculation result of step B, calculate the maximum similarity of the substations, wherein NP1 and NP18 are selected as typical substations of the two types of substations, and the substations corresponding to the substations with the greatest similarity to NP1 and NP18 are calculated respectively. The calculation results are as follows.

[0070]

[0071]

[0072] Step D: According to the calculation result of step C, it can be determined that the line transformer relationship is wrong and it is error type 2, and the line transformer relationship of substation NP18 is wrong. After on-site verification by the operation and maintenance personnel, the line transformer relationship of this type of substation represented by NP1 is correct, and the line transformer relationship of this type of substation represented by NP18 is wrong, and the substation to which the NP18 substation belongs is HR.

[0073] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by technicians in this technical field within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A method for determining the type of line-to-transformer relationship error in a transformer area, characterized in that The following steps are involved: A. Obtain relevant data of the substation area and pre-process the data; B. Calculate the area and line classification marks based on the data preprocessed in step A; C. Calculate the maximum similarity of the substations according to the substation and line classification marks calculated in step B; D. According to the maximum similarity of the substation area calculated in step C, the error type of the substation line change relationship is judged; In step B, the area and line classification marks are calculated based on the data preprocessed in step A, specifically: Assume that M days of data have been collected, there are P substations, Q 10kV lines, and the substations are denoted as S1, S2, …, S P , 10kV lines are denoted as L1, L2, ..., L Q , if for line L q , which belongs to substation S p , the line has N stations, denoted as TQ1, TQ2, TQ3, ..., TQ N , if the substation TQ2 is the reference substation, the similarity of the voltage curves of other substations under the line and the reference substation TQ2 on M days is calculated respectively, and the similarity calculation result is: If the data of the mth terrace area n is missing in the similarity calculation result, let SI n,m is a null value; According to the similarity calculation results, calculate the similarity mark matrix. If SI n,m is non-empty and SI n,m >YZ, then let SIB n,m =1, otherwise SIB n,m =0, if SI n,m If it is null, let SIB n,m Is a null value, where YZ represents the similarity threshold, 1≤n≤N, 1≤m≤M. After completing the above calculation, the similarity mark matrix is ​​obtained: Calculate the station area classification mark based on the similarity mark matrix: make For the nth station area, if SIB n,m =1, then let JH = JH + 1, otherwise let JS = JS + 1, where the initial values ​​of JH and JS are both 0. After completing the calculation for M days, if JH / (JH + JS) ≥ 0.8, then let SIBT n =1, otherwise SIBT n =2, where SIBT n Indicates the classification mark of the nth station area; According to the above method, the classification marks of all substations are calculated. If 1≤n≤N, there is SIBT n =1, then let BL q =1, otherwise BL q =2, where BL q For line L q Classification mark; In step C, the maximum similarity of the substations is calculated according to the substation and line classification marks calculated in step B, specifically: If line L q Classification mark BL q =1, the maximum correlation coefficient of the substation is not calculated, and the substation line-change relationship under this line is correct; If line L q Classification mark BL q =2, line L q The included stations are TQ1, TQ2, TQ3, ..., TQ N , L q The substation it belongs to is S p , since line L q The stations in the system are divided into two categories. One station is randomly selected from each category and recorded as TQ n , TQ n+1 , where TQ n The station classification mark is 1, TQ n+1 The station classification mark is 2, and TQ is calculated separately n , TQ n+1 With no L q The line set L1,L2,…,L Q The voltage curve similarity of all substations in the , record the substation with the largest similarity and its corresponding line, substation, line set L1, L2, ..., L Q Does not contain L q ; Complete the calculation of M days, including TQ n The substation corresponding to the area with the greatest similarity is recorded as: TQS n =[TQS n,1 ,TQS n,2 ,…,TQS n,M ] With Taiwan Area TQ n+1 The substation corresponding to the area with the greatest similarity is recorded as: TQS n+1 =[TQS n+1,1 ,TQS n+1,2 ,…,TQS n+1,M ] TQS n,m Indicates the mth day and the TQ of the area n The substation corresponding to the area with the greatest similarity.

2. A method for determining the type of line-to-transformer relationship error in a transformer area as claimed in claim 1, characterized in that: Step A obtains the relevant data of the substation area and pre-processes the data, specifically: The data related to the substation area include: the correspondence between the substation, 10kV line and the substation area, the substation area name, the substation area address code, and the voltage data of 96 points at the substation area exit; The data is preprocessed, including the calculation of the voltage data of 96 points at the outlet of the substation, selecting a reference substation in each line, and calculating the similarity of the voltage curves of other substations of the line with the reference substation on a line basis. Assume that a 10kV line has N substations, namely TQ1, TQ2, TQ3, ..., TQ N , if the area TQ2 is the reference area, then calculate TQ1, TQ3, TQ4, …, TQ N Similarity with the voltage curve of the TQ2 station.

3. A method for determining the type of line-to-transformer relationship error in a transformer area as claimed in claim 1, characterized in that: The calculation result of step C in step D is used to judge the type of error in the transformer line relationship in the substation area, specifically: TQS for the set n and TQS n+1 Analysis of substations in: 1) If the set TQS n The largest number of substations and lines L q The substations they belong to are all S p , Substation S p The number of NS n,p , and NS n,p / M≥0.8; if the set TQS n+1 The largest number of substations and lines L q The substations they belong to are all S p , Substation S p The number of NS n+1,p , and NS n+1,p / M≥0.8, it means that line L q The line relationship is wrong, and the error type is 1 "line-to-substation relationship error, two types of substations belong to different lines of the same substation"; 2) If the set TQS n The largest number of substations and lines L q The substations they belong to are all S p , Substation S p The number of NS n,p , and NS n,p / M≥0.8; if the set TQS n+1 The largest number of substations and lines L q The substations they belong to are inconsistent with S p+1 , Substation S p+1 The number of NS n+1,p+1 , and NS n+1,p+1 / M≥0.8, it means that line L q Line relationship error, and error type 2 "Line-to-substation relationship error, two types of substations belong to lines in different substations", and the set TQS n+1 The line change relationship in the station area is wrong.

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