Method and system for judging wrong wiring of electric energy metering device based on split-phase reverse electric quantity

Abstract

The invention discloses a three-phase four-wire electric energy metering device wrong wiring rapid discrimination method and system based on phase-split reverse electric quantity, and the method comprises the steps: 1, extracting the details of all three-phase four-wire electricity utilization users, and forming a user list; step 2, obtaining a forward active total indicating value, a reverse active total indicating value, forward and reverse active indicating values of each split phase, and active power and reactive power of each split phase; 3, preliminarily screening the abnormal list, and outputting an abnormal user list and a corresponding abnormal phase list; step 4, selecting a fixed number of time points with the maximum current and complete acquired data in a set time, eliminating wrong wiring and misjudgment caused by special user load characteristics, and outputting an abnormal time point with the maximum current; 5, calculating the absolute value of the power factor of each split phase; and step 6, screening users whose split-phase power factor absolute values are greater than or equal to an adaptive threshold, and outputting a final abnormal user list. The number of base layer anomaly analysis is greatly reduced, and the hit rate of anomaly extraction is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric energy metering and monitoring, and in particular relates to a method and system for quickly determining miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power. Background Art

[0002] Checking for incorrect wiring is crucial to ensuring accurate metering. Under normal circumstances, excluding grid-connected power generation, the meter should measure forward when a user is using electricity. However, incorrect wiring, such as reversed current input and output wiring or cross-phase miswiring of voltage and current, can cause the meter to measure in the reverse direction, resulting in energy loss.

[0003] When analyzing the voltage, current, power and other data of each electricity user in combination with line loss indicators, daily inspections, initial inspections and weekly inspections, due to the differences in hierarchical management of different types of users, only some anomalies can be found through a large number of inspections. In particular, some low-voltage electricity users have incorrect wiring involving the reverse connection of the input and output lines of one or two phases, but the overall active power is still measured in the positive direction. This error is not easy to find and is often overlooked in the daily management process. In addition, systematic or on-site carpet-style inspections are time-consuming and labor-intensive, and work efficiency is low.

[0004] Existing miswiring screening methods primarily rely on remotely generated vector diagrams of voltage, current, active power, and reactive power, or fixed total power indication and current threshold screening rules. These existing methods are unsuitable for scenarios such as long periods of no-load electricity usage, which can occur at any time at a user site. Furthermore, methods using fixed total power indication and current threshold screening rules face bottlenecks in identifying anomalies in loaded scenarios due to interference from factors such as the user's unique load and reactive power compensation equipment. Remotely generated vector diagrams are primarily used to analyze miswiring at high-voltage users, which require less computing power. This resource bottleneck limits their ability to analyze vector diagrams for all low-voltage users. Furthermore, due to interference from factors such as reactive power compensation, phasor diagrams drawn based on power, voltage, and current values ​​may not accurately reflect the on-site wiring status, requiring manual secondary verification of output anomalies. Field staff primarily rely on line losses at the substation to identify anomalies, resulting in low efficiency and a high rate of missed detections. These current issues pose significant challenges for field staff in analyzing metering anomalies.

[0005] Prior art 1 discloses a method and device for identifying the wiring status of an electric energy metering device (CN116500505A). The current value data used is not limited to a certain point in time, but all current values ​​that the meter can obtain in the past 10 days, and the number of data where the A\B\C three-phase currents are not zero is more than 5 times, ensuring that the current is a period of time data rather than a certain point in time data, with a basis for longitudinal observation and comparison analysis. At the same time, a scheme for comprehensive analysis and judgment is added to determine whether the user is a "photovoltaic power generation customer" or a "local power plant user". However, the shortcomings of prior art 1 are that it does not take into account the negative current caused by reactive compensation, and it cannot be judged if there is no electricity for a long time in the early stage of wrong wiring.

[0006] Prior art 2 discloses a method for identifying the wiring status of an electric energy metering device (CN116520235A). Based on the positive table code and the reverse table code, it identifies whether a single-phase meter is connected in reverse, solving the problem of being unable to accurately identify whether a single-phase meter is connected in reverse only by the positive and negative values ​​of the current. However, the shortcoming of prior art 2 is that it is only applicable to reverse wiring of single-phase meters, and three-phase meters still have the problem of low accuracy.

[0007] Therefore, there is an urgent need for a technical method for remote and automated troubleshooting of miswiring based on phase-by-phase reverse power flow, which can quickly lock suspected miswiring electricity metering devices for massive three-phase four-wire users under limited computing resources, thereby improving the accuracy and timeliness of on-site abnormality troubleshooting. Summary of the Invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method and system for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on abnormal reverse power per phase. By obtaining the metering data collected by the electric energy meter, the total forward / reverse active power of the user and the forward / reverse active power of each phase and the power factor of each component are used for comprehensive calculation and judgment. The method aims to automatically lock the electric energy metering devices that are highly suspected of being miswired among a large number of users, thereby improving the accuracy and timeliness of abnormality detection.

[0009] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0010] In a first aspect, the present invention provides a method for quickly determining miswiring of a three-phase four-wire electric energy metering device based on reverse electric quantity, which specifically comprises the following steps:

[0011] Step 1: Extract the details of all three-phase four-wire electricity users from the pre-acquired user files to form a three-phase four-wire user list;

[0012] Step 2: According to the three-phase four-wire user list extracted in step 1, obtain the total forward active power indication, the total reverse active power indication, the forward and reverse active power indications of each phase, and the active power and reactive power of each phase;

[0013] Step 3: Screen the total forward and reverse active power indications and the forward and reverse active power indications by phase obtained in step 2, perform preliminary screening on the abnormal list, and output the abnormal user list and the corresponding abnormal phase list after preliminary screening;

[0014] Step 4: From the list obtained in step 3, select a fixed number of time points with maximum current and complete data collection within the set time, and eliminate misjudgments of wrong wiring due to special user load characteristics and abnormal maximum output current time points;

[0015] Step 5: Calculate the absolute value of the power factor of each phase based on the active power and reactive power of each phase collected in step 2, combining the outputs of steps 3 and 4;

[0016] Step 6: Filter the users whose absolute values ​​of the split-phase power factors in step 5 are greater than or equal to the adaptive threshold, and output the final abnormal user list.

[0017] Preferably, in step 2, the current value of each phase and the comprehensive multiplier of the meter measurement point file are also obtained.

[0018] Preferably, in step 3, the preliminary screening includes the abnormal accumulated reverse power and reverse active power, and respectively screens out the situation where the reverse power of the electric energy meter is increasing but the forward power of the phase is basically not increasing, and the situation where both the forward and reverse power of the phase are increasing but the reverse power is greater than the forward power.

[0019] Preferably, in the judgment criterion of abnormality of the accumulated reverse power per phase, if any one phase satisfies the following three conditions at the same time, it indicates that the accumulated reverse power per phase is abnormal:

[0020] (1) The forward active power indication value of the phase is less than the reverse active power indication value of the phase;

[0021] (2) The forward active power indication of the phase multiplied by the comprehensive multiplication factor of the metering point ≤ r1·σ;

[0022] (3) The reverse active power indication value of the phase multiplied by the comprehensive multiplication factor of the metering point ≥ r2·σ;

[0023] Wherein, σ is the cumulative number of months the electricity meter has been in operation; r1 is the threshold for no movement in the forward direction; and r2 is the threshold for normal movement in the reverse direction.

[0024] Preferably, in the judgment of the reverse active power abnormality, if any phase satisfies the following two conditions at the same time, it indicates that the reverse active power abnormality of the phase:

[0025] (1) The monthly increment of the positive active power indication value of the phase is less than the monthly increment of the negative active power indication value of the phase;

[0026] (2) The monthly increment of the reverse active power indication value of the phase multiplied by the comprehensive multiplication factor of the metering point is ≥ r2;

[0027] Among them, r2 is the threshold value of normal reverse movement.

[0028] Preferably, in step 4, if the number of times the current corresponding to the time point is positive exceeds the set number and the current during the user's main load power consumption period exceeds the set time length, the user is eliminated, eliminating the misjudgment of wrong wiring due to the special load characteristics of the user.

[0029] Preferably, in step 4, the calculation of the abnormal time point at which the current is maximum includes:

[0030] Step 4.1: Based on the abnormal user list in step 3, form a current time series set for all the acquisition time points of the abnormal phase. In this set, obtain multiple data with the largest absolute current value of the abnormal phase of the abnormal user in the statistical month, as well as the corresponding time points;

[0031] Step 4.2: Confirm whether the data corresponding to the time points collected in step 4.1 are complete. If there is any missing data, traverse from large to small according to the current time series until the data is complete;

[0032] Step 4.3: Based on the complete data from step 4.2, check the positive and negative signs of the current values ​​corresponding to the abnormal phase of the user at multiple time points. If there are more points with positive values ​​exceeding the set threshold, obtain the absolute value of the total current of the abnormal phase of the abnormal user in the statistical month in the collection system;

[0033] Step 4.4: Based on the absolute value of the full current obtained in step 4.3, count the time points at which the absolute value of the full current exceeds the fixed threshold. The number of time points at which the current sign is positive is n. 正 , the number of time points when the current sign is negative is n 负 , if n 正 ≥n 负 The user is removed from the exception list; otherwise, the user is retained and the corresponding time point in step 4.1 is output.

[0034] Preferably, in step 5, the absolute value calculation formula of the power factor of each phase is:

[0035]

[0036] Wherein, |cosα| is the absolute value of the power factor of each phase; P is the active power of each phase; and Q is the reactive power of each phase.

[0037] Preferably, in step 6, the adaptive threshold is:

[0038]

[0039] Among them, λ th is the adaptive threshold, S mp is the capacity value of the metering point in the user file; k is the adjustment parameter of the adaptive threshold, and i is the phase current.

[0040] A second aspect of the present invention provides a system for quickly identifying miswiring using the above-mentioned method for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power, comprising:

[0041] Data acquisition unit, phase-by-phase reverse power monitoring unit, phase-by-phase power factor calculation unit, wrong wiring comprehensive judgment unit and abnormality output unit;

[0042] The data acquisition unit is used to store large amounts of information such as user power, current and wiring methods;

[0043] The phase-by-phase reverse power monitoring unit is used to automatically extract the required data on a monthly basis and preliminarily screen out a list of suspected anomalies;

[0044] The phase-splitting power factor calculation unit is used to calculate the power factor of the corresponding power calculation element;

[0045] The wrong wiring comprehensive judgment unit is used to integrate the condition judgment data of the phase reverse power monitoring unit and the phase power factor calculation unit, and add the judgment threshold;

[0046] The exception output unit is used to output the final analysis results in a list format for grassroots personnel to view, analyze and process at any time.

[0047] Compared with the prior art, the present invention has the following benefits:

[0048] 1. The present invention processes the existing data of the acquisition system and uses algorithms to grasp the total and phase-by-phase measurement conditions, without requiring a large amount of data processing;

[0049] 2. By extracting the reverse power of each phase, it can more intuitively display possible miswiring and abnormal metering users;

[0050] 3. By introducing the calculation of the positive and negative current of the maximum load point and the power factor of each phase, users with normal wiring but reverse power generation due to special loads or reactive power compensation are effectively excluded, and easily overlooked problems are extracted, such as users with misconnected phases but positive overall metering. This greatly reduces the number of grassroots abnormality analyses and improves the hit rate of abnormality extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is an implementation flow chart of the present invention;

[0052] Figure 2It is a system configuration diagram of the present invention. DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0054] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0055] In three-phase, four-wire electricity, various types of miswiring occur frequently. Some miswiring can cause the user's total active power to flow in the reverse direction, making it relatively easy to detect. However, other miswiring can cause the user's total active power to flow in the forward direction, while the active power of each phase may flow in the reverse direction. This anomaly is more difficult to detect. Furthermore, miswiring can cause reverse flow not only in individual phases but also in the nature of the user's electricity consumption and reactive power compensation, complicating the analysis of metering anomalies.

[0056] In response to this situation, by studying the various curve data of users of phase-by-phase reverse power, comprehensively considering the size relationship and increment of phase-by-phase forward power and phase-by-phase reverse power, and combining the power factor values ​​of each component obtained through calculation, it is possible to quickly determine the wrong wiring situation through phase-by-phase reverse power.

[0057] The present invention is based on the phase-by-phase reverse power of the three-phase four-wire electric energy metering device wrong wiring fast judgment method as follows Figure 1 As shown, the specific steps include:

[0058] Step 1: Extract the details of all three-phase four-wire electricity users from the pre-acquired user files. Combined with information such as the nature and type of metering points, eliminate electricity gateways and users with power generation and grid connection to form a three-phase four-wire user list.

[0059] At the set data statistical frequency, the details of all three-phase four-wire electricity users are counted from the electricity consumption information collection system. Combined with information such as the nature and type of metering points, users who may have normal reverse active power metering, such as electricity consumption gateways and users with power generation grid connection, are eliminated to form a list of three-phase four-wire users to be analyzed.

[0060] Step 2: According to the three-phase four-wire user list extracted in step 1, obtain the total forward active power indication W 总+ , total reverse active power indication W 总-, and the forward and reverse active power indication W of each phase A / B / C A+ 、W B+ 、W C+ 、W A- 、W B- 、W C- . Get the active power and reactive power P of each phase A 、P B 、P C , Q A , Q B , Q C And the current value of each phase i A 、i B 、i C . Get the comprehensive multiplier K of the meter measurement point file.

[0061] Step 3: Screen the total forward and reverse active power indications and the forward and reverse active power indications of each phase obtained in step 2, perform preliminary screening of the abnormal list, and output the abnormal user list and the corresponding abnormal phase list after preliminary screening.

[0062] The preliminary screening includes two judgment conditions: "abnormal cumulative reverse power per phase" and "abnormal reverse active power", which respectively screen out the situation where the reverse power of the electric energy meter per phase is increasing but the forward power of the phase is basically not increasing, and the situation where both the forward and reverse power of the phase are increasing but the reverse power is greater than the forward power.

[0063] Initial screening of exception lists

[0064] In order to make the abnormal list judgment of phase reverse power more accurate, we first define two nouns and then set the judgment criteria.

[0065] In a preferred but non-limiting embodiment of the present invention, the electric quantity is calculated by the indicated value or the indicated value difference×the comprehensive multiplication factor.

[0066] Step 3.1, Definition 1: "Cumulative phase reverse power abnormality" means that the cumulative reverse active power indication value of any phase during data statistics is greater than the forward active power indication value, and the forward active power indication value is less than the set threshold.

[0067] Criterion 1 is as follows: Taking the abnormal reverse charge of phase A as an example, the following three conditions are met at the same time. The analysis process of phases B and C refers to the analysis process of phase A.

[0068] (1) Phase A forward active power indication W A+ <A phase reverse active power indication value W A- ;

[0069] (2) Phase A forward active power indication W A+ ·K≤r1·σ;

[0070] (3) Phase A reverse active power indication WA- ·K≥r2·σ.

[0071] Where: K is the comprehensive multiplier of the metering point; σ is the cumulative operating months of the electricity meter, and non-integer months are rounded up to integer months; r1 is the threshold for no movement in the forward direction; r2 is the threshold for normal movement in the reverse direction.

[0072] If any phase meets the following three conditions, it means that the accumulated reverse power of the phase is abnormal:

[0073] (1) The forward active power indication value of the phase is less than the reverse active power indication value of the phase;

[0074] (2) The forward active power indication of the phase multiplied by the comprehensive multiplication factor of the metering point ≤ r1·σ;

[0075] (3) The reverse active power indication value of the phase multiplied by the comprehensive multiplication factor of the metering point ≥ r2·σ.

[0076] The purpose of setting this rule is to compile statistics on the reverse power consumption from the time the meter is newly installed to the statistical date, but there is basically no power consumption in the forward direction. At the same time, it can eliminate some users who measure reverse active power due to unreasonable reactive power compensation.

[0077] In a preferred but non-limiting embodiment of the present invention, based on the experience of summarizing the electricity consumption of on-site users, the threshold value r1 for the forward non-operation in step 3.1 is set between 4 and 8 kWh, that is, the weekly power consumption of the meter per phase does not exceed 1 to 2 kWh; the threshold value r2 for the reverse normal operation is set between 15 and 30 kWh, that is, the daily power consumption of the meter per phase exceeds 0.5 to 1 kWh.

[0078] Step 3.2, Definition 2: "Reverse active power abnormality" is defined as the increment of the reverse active power indication value of any phase within a month being greater than the increment of the forward active power indication value of any phase.

[0079] Criterion 2 is as follows: Taking the abnormal reverse charge of phase A as an example, if the following two conditions are met at the same time, the analysis process of phases B and C refers to the analysis process of phase A.

[0080] (1)ΔW A+ <ΔW A-

[0081] (2)ΔW A- K ≥ r2

[0082] Where ΔW A+ The monthly phase-by-phase forward active power indication increment is calculated as the forward active power indication value W of phase A in that month. A+ (m) minus the positive active power indication value W of phase A in the previous month A+ (m-1); ΔW A-The monthly increment of the reverse active power indication value per phase is calculated as the reverse active power indication value W for phase A of the month. A- (m) minus the positive active power indication value W of phase A in the previous month A- (m-1); K is the comprehensive multiplication factor of the measurement point; r2 is the threshold value of normal reverse movement.

[0083] If any of the points are the same and the following two conditions are met, it means that the active power movement in the opposite direction of the point is abnormal:

[0084] (1) The monthly increment of the positive active power indication value of the phase is less than the monthly increment of the negative active power indication value of the phase;

[0085] (2) The monthly increment of the reverse active power indication value of the phase multiplied by the comprehensive multiplication factor of the metering point is ≥ r2;

[0086] Among them, r2 is the threshold value of normal reverse movement.

[0087] The purpose of setting this rule is to count the users whose reverse active power per phase is greater than the forward active power per phase as of the statistical date. Compared with Definition 1, it can screen out the cases where there is no wrong wiring when the electricity meter is installed but it is mistakenly changed to wrong wiring due to poor operation and maintenance later, and the cases where wrong wiring occurs to users whose partial loads such as elevator users are operating normally and have positive and negative phase power flowing simultaneously.

[0088] Preferably, the setting range of the threshold value r2 for reverse normal movement in step 3.2 is the same as that in step 3.1.

[0089] In step 3.3, users meeting the criteria of "abnormal cumulative reverse power per phase" and "abnormal reverse active power" are screened out respectively, and the results are combined to form a preliminary screened abnormal user list and a corresponding abnormal phase list Y.

[0090] In a preferred but non-limiting embodiment of the present invention, the comprehensive multiplier K of a three-phase four-wire user Y1 is 1, and the forward and reverse active power indications of each phase {W A+ ,W B+ ,W C+ ,W A- ,W B- ,W C-}for

[0091] {4684.62,7021.03,0,0,0,617.97}, the cumulative operating months of the energy meter σ = 3, the forward and reverse readings of phase C meet the criterion 1, and it is included in the abnormal list Y; the comprehensive multiplier K of a three-phase four-wire user Y2 is 20, and the monthly increment of the forward and reverse active power readings of each phase {ΔW A+ ,ΔW B+ ,ΔW C+ ,ΔW A- ,ΔW B-,ΔW C-}for

[0092] {79.92,2.31,68.72,0,6.81,0}, the positive and negative phase indications of phase B meet criterion 2 and are included in abnormal list Y.

[0093] Compared to the prior art method of using total forward and reverse active energy and meter current to identify miswiring, the present invention incorporates the phase-by-phase positive and negative indications in step 3 as the primary identification criteria. This allows for screening for difficult-to-find miswiring scenarios, such as a three-phase four-wire meter with one phase current input and output wire reversed, where the meter's total forward active energy reading continues to show a constant number when the three phases of the load are essentially balanced. Furthermore, it can also screen for miswiring users who have not used electricity for a long time but have a history of electricity use following an earlier miswiring. This method significantly expands the scope of on-site miswiring identification scenarios.

[0094] Step 4: For the list obtained in step 3, select a fixed number of time points with the largest current and complete data in the past month. If the number of times the current corresponding to the time point is positive exceeds the set number and the current during the user's main load power consumption period exceeds the set time length, the user will be eliminated. This will eliminate misjudgments of wrong wiring caused by special user load characteristics, further improve the accuracy of the wrong wiring judgment method of the present invention, and output the abnormal time point with the largest current.

[0095] In a preferred but non-limiting embodiment of the present invention, if the current at the judgment time point is positive for more than 2 times and the current is positive for more than half of the time during the user's main load power consumption period, the user is eliminated, thereby eliminating misjudgment of wrong wiring due to the special load characteristics of the user.

[0096] Get the time point corresponding to the calculation data:

[0097] Step 4.1: Based on the initial screening abnormal user list Y in step 3, form a current time series set for all acquisition time points of abnormal phases, and obtain multiple data S with the largest absolute current value of abnormal phases of abnormal users in the statistical month in the acquisition system. max , and the corresponding time points.

[0098] In a preferred but non-limiting embodiment of the present invention, the specific statistical method is to form a current time series set S = {i(t1), i(t2), ..., i(t n )}, take the largest 8 values ​​in S to form S max =Top8(S). Get S max Corresponding time point t (1) ,t (2) ,…,t (8) .

[0099] Step 4.2: Confirm the time point t in the acquisition system in step 4.1 (1) ,t (2) ,…,t (8) The corresponding active, reactive, and current data items are complete. If there is any data missing, the current maximum value time series set S is traversed from large to small until the data is complete.

[0100] Step 4.3: Based on the complete data from step 4.2, check the positive and negative signs of the current values ​​corresponding to the abnormal phase of the user at multiple time points. If there are more points with positive values ​​than the set threshold, obtain the absolute value of the full current of the abnormal phase of the abnormal user in the statistical month in the acquisition system.

[0101] In a preferred but non-limiting embodiment of the present invention, the user's (1) ,t (2) ,…,t (8) The positive and negative signs of the current values ​​of the corresponding abnormal phases are determined. If there are more than one positive points, the absolute value of the total current of the abnormal phases of the abnormal users in the statistical month is obtained in the collection system.

[0102] Step 4.4: Based on the absolute value of the full current obtained in step 4.3, count the time points at which the absolute value of the full current exceeds the fixed threshold. The number of points at which the current sign is positive is n. 正 , the number of points where the current sign is negative is n 负 , if n 正 ≥n 负 The user is removed from the exception list; otherwise, the user is retained and the corresponding time point in step 4.1 is output.

[0103] Preferably, the fixed threshold in step 4.4 is between 0.2 and 0.5.

[0104] In a preferred but non-limiting embodiment of the present invention, the reverse power of phase C of a three-phase four-wire abnormal user Y1 in the initial screening list Y is abnormal. After checking the data of the acquisition system, it can be found that within the statistical month, the eight time points with the maximum absolute value of the phase C current are 14:30 on the 5th, 12:45 on the 6th, 17:30 on the 18th, 13:30 on the 26th, 13:45 on the 26th, 14:30 on the 26th, 14:45 on the 26th, and 15:00 on the 26th, and the active power and reactive power data items at these eight points are complete, and the phase C currents corresponding to the eight time points are all negative. Therefore, the abnormality of this household will continue to be retained and the next judgment will be carried out.

[0105] Step 5: Combine the abnormal users, corresponding abnormal phases and the time point of maximum abnormal current obtained in step 3 and step 4, and calculate the active power P of each phase according to the collected data. A 、P B 、P CAnd the reactive power Q of each phase A , Q B , Q C , further calculate the absolute value of the power factor of each phase |cosα A |、|cosα B |、|cosα C |.

[0106]

[0107] Wherein, |cosα| is the absolute value of the power factor of each phase; P is the active power of each phase; and Q is the reactive power of each phase.

[0108] For example, the reverse power of phase C of a three-phase four-wire abnormal user Y1 in the initial screening list Y is abnormal, and the active power of phase C corresponding to the eight maximum current time points is {P C1 ,P C2 ,…,P C8}, the reactive power of phase C is {Q C1 ,Q C2 ,…,Q C8}, the absolute value of the power factor of phase C is {|cosα C1 |,|cosα C2 |,…,|cosα C8 |}.

[0109] Step 6: Screen the absolute value of the phase power factor in step 5 to be greater than or equal to the adaptive threshold λ th The final abnormality list is output when the accumulated reverse power abnormality or reverse active power abnormality is met and the absolute value of each phase power factor is greater than or equal to the adaptive threshold.

[0110] The power factor adaptive threshold is correlated to the capacity of the user metering point and the current at that moment. Users with larger capacity place greater emphasis on reactive power compensation due to the heavier power factor assessment, resulting in a relatively higher actual power factor. Conversely, users with smaller capacity tend to have a lower power factor. When the current is large, reactive power compensation has a relatively small impact on the power factor. Conversely, when the current is small, reactive power compensation has a more significant impact on the power factor. Based on field experience, the adaptive threshold λ th It can be summarized as a function expression that changes with the phase current i.

[0111] When the metering point is an electric energy meter connected via a transformer:

[0112]

[0113] Among them, S mpis the capacity value (kVA) of the metering point in the user profile; k is the adjustment parameter of the adaptive threshold, corresponding to the steepness of the function; i is the phase current.

[0114] When the metering point is a direct-access electric energy meter, i≥2, λ th If set to 0.8, the power factor threshold is no longer limited when i<2.

[0115] The absolute value of the power factor obtained in step 5 is further analyzed and judged. In order to further eliminate the reverse power anomaly list caused by power compensation problems and further improve the accuracy of the method for judging wrong wiring of the present invention, the absolute values ​​of the power factors corresponding to the 8 time points of the abnormal phase are set to satisfy |cosα|≥power factor adaptive threshold λ. th If the conditions are not met, the user will be removed from the exception list; otherwise, the user will be retained.

[0116] Preferably, the adjustment parameter k in step 6 is set between 2 and 5.

[0117] Output the final exception list Y Z That is, based on the list obtained in step 3, after determining the phase with the reverse active power metering anomaly, among the eight points with the largest absolute current values ​​in the statistical month, the actual current collection values ​​must have no more than one positive value, and the rest must be negative. In addition, the absolute value of the power factor corresponding to this phase, |cosα|, must be greater than or equal to the power factor threshold.

[0118] In a preferred but non-limiting embodiment of the present invention, the reverse power of phase C of three-phase four-wire user Y1 and phase B of Y2 obtained in step 4 is abnormal. Step 5 calculates that the absolute value of the phase C power factor corresponding to user Y1 is {0.995, 0.998, 0.994, 0.994, 0.994, 0.991, 0.995, 0.993}, and the absolute value of the phase B power factor corresponding to user Y3 is {0.039, 0.038, 0.039, 0.039, 0.039, 0.039, 0.039, 0.039}. User Y1 and user Y3 both correspond to directly connected electric energy meters. By comparison, it is found that the absolute value of the phase C power factor of user Y1 is greater than or equal to the upper limit of the adaptive threshold 0.9, while the absolute value of the phase B power factor of user Y2 is less than the lower limit of the adaptive threshold 0.6. Therefore, the phase B abnormal list of user Y3 is eliminated, and the final output abnormal list Y Z Among the three-phase four-wire user Y1, the reverse power of phase C is abnormal, which is suspected to be a wrong wiring.

[0119] Table 1 Statistics of the operating data of the eight maximum current points of a certain user Y1 with abnormal cumulative reverse power consumption in that month

[0120]

[0121]

[0122] Table 2 Statistics of the eight maximum current points of the month for user Y3 with abnormal cumulative reverse power consumption

[0123]

[0124] The present invention incorporates phase-separated forward and reverse indication into the analysis and judgment, and achieves the following effects:

[0125] First, it can greatly improve the accuracy of research and judgment;

[0126] Secondly, it can screen out some difficult-to-find wrong wiring, such as a three-phase four-wire meter where one phase current input and output wires are connected in reverse, and its power always flows in the positive direction;

[0127] The third is that some users who have not used electricity for a long time actually had incorrect wiring in the early stage. Now they do not use electricity so there is no current, but this can be judged through the phase indication.

[0128] In addition, the present invention provides a system for quickly identifying wrong wiring using the above-mentioned method for quickly identifying wrong wiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power, such as Figure 2 shown.

[0129] It mainly includes a data acquisition unit, a phase-by-phase reverse power monitoring unit, a phase-by-phase power factor calculation unit, a wrong wiring comprehensive judgment unit and an abnormality output unit.

[0130] The data acquisition unit is used to store big data information such as user power, current and wiring mode;

[0131] The phase reverse power monitoring unit is used to automatically extract the required data on a monthly basis using the intelligent analysis method of the present invention, and preliminarily screen out a list of suspected anomalies;

[0132] The phase power factor calculation unit is used to calculate the power factor of the corresponding power calculation element according to the analysis and judgment method of the present invention;

[0133] The wrong wiring comprehensive judgment unit is used to integrate the condition judgment data of the phase reverse power monitoring unit and the phase power factor calculation unit, and add the judgment threshold;

[0134] The exception output unit is used to output the final analysis results in a list format for grassroots personnel to view, analyze and process at any time.

[0135] At the same time, after verifying the output results of the abnormal output unit, if it is verified on site that there is no installation problem, the list items can also be labeled, such as elevator households, reactive power compensation problems, dual power supply parallel operation, etc., to facilitate the rapid elimination of interference in future abnormal monitoring processes.

[0136] The present invention can overcome the shortcomings of the existing technology and provide a method and system for quickly distinguishing the miswiring of a three-phase four-wire electric energy metering device based on the abnormal reverse power of each phase. By obtaining the metering collection data and calculating and judging the total reverse active power and the reverse active power of each phase and the power factor of each phase, the present invention aims to quickly lock in electric energy metering devices that are highly suspected of being miswired among a large number of users, provide on-site inspectors with an accurate abnormality verification list, improve the accuracy and timeliness of abnormality investigation, and thus provide a basis for the recovery (refund) of electricity.

[0137] The present disclosure may be a system, method and / or computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0138] A computer-readable storage medium can be a tangible device that can hold and store instructions for use by an instruction execution device. A computer-readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination thereof. As used herein, a computer-readable storage medium is not to be construed as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through an electrical wire.

[0139] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions to be stored in the computer-readable storage medium in each computing / processing device.

[0140] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, and conventional procedural programming languages ​​such as "C" language or similar programming languages. Computer-readable program instructions may be executed entirely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., utilizing an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be personalized by utilizing the state information of the computer-readable program instructions. The electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0141] 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 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 by the scope of protection of the claims of the present invention.

Claims

1. A method for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power, characterized in that: include: Step 1: Extract the details of all three-phase four-wire electricity users from the pre-acquired user files to form a three-phase four-wire user list; Step 2: According to the three-phase four-wire user list extracted in step 1, obtain the total forward active power indication, the total reverse active power indication, the forward and reverse active power indications of each phase, and the active power and reactive power of each phase; Step 3: Screen the total forward and reverse active power indications and the forward and reverse active power indications by phase obtained in step 2, perform preliminary screening on the abnormal list, and output the abnormal user list and the corresponding abnormal phase list after preliminary screening; Step 4: From the list obtained in step 3, select a fixed number of time points with maximum current and complete data collection within the set time, and eliminate misjudgments of wrong wiring due to special user load characteristics and abnormal maximum output current time points; Step 5: Calculate the absolute value of the power factor of each phase based on the active power and reactive power of each phase collected in step 2, combining the outputs of steps 3 and 4; Step 6: Filter the users whose absolute values ​​of the split-phase power factors in step 5 are greater than or equal to the adaptive threshold, and output the final abnormal user list.

2. The method for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power according to claim 1 is characterized in that: In step 2, the current value of each phase and the comprehensive multiplication factor of the meter metering point file are also obtained.

3. The method for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power according to claim 1 is characterized in that: In step 3, the preliminary screening includes abnormal cumulative reverse power per phase and abnormal reverse active power, and respectively screens out the situation where the reverse power per phase of the electric energy meter is changing but the forward power per phase is basically not changing, and the situation where both the forward and reverse power per phase are changing but the reverse power is greater than the forward power.

4. The method for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power according to claim 3 is characterized in that: In the judgment criteria for abnormal cumulative reverse power per phase, if any phase meets the following three conditions at the same time, it means that the cumulative reverse power per phase of the phase is abnormal: (1) The forward active power indication value of the phase is less than the reverse active power indication value of the phase; (2) The forward active power indication of the phase multiplied by the comprehensive multiplication factor of the metering point ≤ r1·σ; (3) The reverse active power indication value of the phase multiplied by the comprehensive multiplication factor of the metering point ≥ r2·σ; Wherein, σ is the cumulative number of months the electricity meter has been in operation; r1 is the threshold for no movement in the forward direction; and r2 is the threshold for normal movement in the reverse direction.

5. The method for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power according to claim 3 is characterized in that: In the judgment of reverse active power abnormality, if any phase satisfies the following two conditions at the same time, it means that the reverse active power abnormality of the phase is present: (1) The monthly increment of the positive active power indication value of the phase is less than the monthly increment of the negative active power indication value of the phase; (2) The monthly increment of the reverse active power indication value of the phase multiplied by the comprehensive multiplication factor of the metering point is ≥ r2; Among them, r2 is the threshold value of normal reverse movement.

6. The method for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power according to claim 1 is characterized in that: In step 4, if the number of times the current corresponding to the time point is positive exceeds the set number and the current during the user's main load power consumption period exceeds the set time length, the user is eliminated, eliminating the misjudgment of wrong wiring due to the special characteristics of the user's load.

7. The method for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power according to claim 1 is characterized in that: In step 4, the calculation of the abnormal time point with the maximum current includes: Step 4.1: Based on the abnormal user list in step 3, form a current time series set for all the acquisition time points of the abnormal phase. In this set, obtain multiple data with the largest absolute current value of the abnormal phase of the abnormal user in the statistical month, as well as the corresponding time points; Step 4.2: Confirm whether the data corresponding to the time points collected in step 4.1 are complete. If there is any missing data, traverse from large to small according to the current time series until the data is complete; Step 4.3: Based on the complete data from step 4.2, check the positive and negative signs of the current values ​​corresponding to the abnormal phase of the user at multiple time points. If there are more points with positive values ​​exceeding the set threshold, obtain the absolute value of the total current of the abnormal phase of the abnormal user in the statistical month in the collection system; Step 4.4: Based on the absolute value of the full current obtained in step 4.3, count the time points at which the absolute value of the full current exceeds the fixed threshold. The number of time points at which the current sign is positive is n. 正 , the number of time points when the current sign is negative is n 负 , if n 正 ≥n 负 The user is removed from the exception list; otherwise, the user is retained and the corresponding time point in step 4.1 is output.

8. The method for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power according to claim 1 is characterized in that: In step 5, the absolute value of the power factor of each phase is calculated as follows: Wherein, |cosα| is the absolute value of the power factor of each phase; P is the active power of each phase; and Q is the reactive power of each phase.

9. The method for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power according to claim 1 is characterized in that: In step 6, the adaptive threshold is: Among them, λ th is the adaptive threshold, S mp is the capacity value of the metering point in the user file; k is the adjustment parameter of the adaptive threshold, and i is the phase current.

10. A system for quickly identifying miswiring using the method for quickly identifying miswiring of a three-phase four-wire electric energy metering device based on phase-by-phase reverse power according to any one of claims 1 to 9, characterized in that: include: Data acquisition unit, phase-by-phase reverse power monitoring unit, phase-by-phase power factor calculation unit, wrong wiring comprehensive judgment unit and abnormality output unit; The data acquisition unit is used to store large amounts of information such as user power, current and wiring methods; The phase-by-phase reverse power monitoring unit is used to automatically extract the required data on a monthly basis and preliminarily screen out a list of suspected anomalies; The phase-splitting power factor calculation unit is used to calculate the power factor of the corresponding power calculation element; The wrong wiring comprehensive judgment unit is used to integrate the condition judgment data of the phase reverse power monitoring unit and the phase power factor calculation unit, and add the judgment threshold; The exception output unit is used to output the final analysis results in a list format for grassroots personnel to view, analyze and process at any time.

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