CN107863770B - Method for judging abnormal reason of line loss rate of low-voltage transformer area - Google Patents

Method for judging abnormal reason of line loss rate of low-voltage transformer area Download PDF

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CN107863770B
CN107863770B CN201710944263.1A CN201710944263A CN107863770B CN 107863770 B CN107863770 B CN 107863770B CN 201710944263 A CN201710944263 A CN 201710944263A CN 107863770 B CN107863770 B CN 107863770B
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黄勇
陆斌
张杨
刘燕
杨海滔
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State Grid Shanghai Electric Power Co Ltd
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Abstract

A method for judging the abnormal reason of the line loss rate of a low-voltage transformer area belongs to the field of measurement. Firstly, determining a definition standard that the line loss rate is abnormal and the line loss rate is unreasonable or not abnormal; then, constructing an efficient judging flow according to different data representations of the abnormal line loss rate caused by different factors, and analyzing and correcting the abnormal line loss rate caused by various factors; further, a line loss rate abnormality analysis method capable of judging a composite cause is obtained. The method can be widely applied to the field of power supply operation and line loss management of low-voltage transformer areas.

Description

Method for judging abnormal reason of line loss rate of low-voltage transformer area
Technical Field
The invention belongs to the field of measurement, and particularly relates to a method for judging the reason of the abnormal line loss rate of a low-voltage transformer area.
Background
The premise of energy conservation and consumption reduction guided by line loss refinement is that the obtained line loss rate statistic is real and reliable. However, in practical applications, it is found that the line loss rate of the low-voltage distribution area obtained by the method for comparing the sold electricity quantities is often abnormal (negative value, abnormally high value). For example, in a month of 2015 of a certain power supply company, a station area with a line loss rate of 0-10% accounts for about 50%, the line loss rate of more than 10% of the rest station areas is negative, and the line loss rate of more than 4% of the rest station areas exceeds 50%. The abnormal line loss rate causes the line loss rate statistical result to lose the guiding significance of energy conservation and loss reduction.
Therefore, identifying the line loss rate abnormality and finding out the possible cause of the line loss rate abnormality become important problems to be solved in the line loss management work.
Disclosure of Invention
The invention aims to provide a method for judging the reason of the abnormal line loss rate of a low-voltage transformer area. The method comprises the steps of firstly determining a definition standard of line loss rate abnormity relative to unreasonable (non-abnormal) line loss rate, then constructing an efficient judging process according to different data representations of the line loss rate abnormity caused by different factors, and analyzing and correcting the line loss rate abnormity caused by various factors, thereby obtaining the line loss rate abnormity analysis method capable of judging the compound reason.
The technical scheme of the invention is as follows: the method for judging the abnormal reason of the line loss rate of the low-voltage transformer area is characterized by comprising the following steps:
firstly, determining a definition standard that the line loss rate is abnormal and the line loss rate is unreasonable or not abnormal;
then constructing an efficient judging flow according to different data representations of the abnormal line loss rate caused by different factors, and analyzing and correcting the abnormal line loss rate caused by various factors;
further, a line loss rate abnormality analysis method capable of judging a composite cause is obtained.
Specifically, when determining the definition standard that the line loss rate is abnormal and is not unreasonable relative to the line loss rate or is abnormal, the threshold for determining the line loss rate abnormality of the station area has two: one is a threshold value between the reasonable high loss rate and the abnormal high loss rate, and is called as an upper threshold value; the other is a threshold between reasonably low line loss rate-abnormally low line loss rate, called the lower threshold.
Further, the lower threshold is set to 0%, and when the upper threshold is set, two problems of three-phase load unbalance and insufficient reactive power compensation need to be considered.
Specifically, the determination method comprises the steps of determining a technical problem, correcting line loss, identifying unbalanced three-phase load, correcting line loss, identifying insufficient reactive compensation, identifying administrative problems, correcting line loss, identifying unmatched subscriber information, correcting line loss, identifying unmatched CT transformation ratio of a gateway table, correcting line loss, identifying low meter reading success rate, correcting line loss and identifying serious electricity stealing problems, and correcting line loss.
The judging method provided by the technical scheme of the invention provides a composite line loss rate abnormity reason identifying method, which can identify and correct line loss rate abnormity caused by various reasons including technical and managerial factors.
Compared with the prior art, the invention has the advantages that:
according to the technical scheme, the definition standard of the line loss rate abnormity relative to the unreasonable (non-abnormal) line loss rate is determined, then an efficient judging process is constructed according to different data representations of the line loss rate abnormity caused by different factors, the line loss rate abnormity caused by various factors is analyzed and corrected, and the line loss rate abnormity analysis method capable of judging the composite reason is obtained.
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FIG. 1 is a schematic diagram of a general flow of identifying the cause of the line loss rate anomaly according to the present invention;
FIG. 2 is a schematic diagram illustrating the process of determining the administrative problem in the abnormal line loss rate analysis according to the present invention;
FIG. 3 is a schematic diagram illustrating a procedure for identifying a faulty connection of a gateway table according to the present invention;
fig. 4-1 to 4-5 are several representations of line loss rate anomalies.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The technical scheme of the invention provides a method for judging the reason of the line loss rate abnormity of a low-voltage transformer area, which is characterized by comprising the following steps:
firstly, determining a definition standard that the line loss rate is abnormal and the line loss rate is unreasonable or not abnormal;
then constructing an efficient judging flow according to different data representations of the abnormal line loss rate caused by different factors, and analyzing and correcting the abnormal line loss rate caused by various factors;
further, a line loss rate abnormality analysis method capable of judging a composite cause is obtained.
Definition of non-abnormal upper bound value of line loss rate of transformer area
The abnormal line loss rate of the transformer area refers to the distortion of the line loss rate, namely the deviation of the statistical value of the line loss rate from the actual technical line loss in the transformer area. For this reason, the causes of the line loss rate abnormality mainly include:
(1) and (3) wiring errors of the gateway table: in this case, the power supply amount is small, and the line loss rate is negative;
(2) the success rate of centralized reading is low: in this case, the electricity selling amount is low, and the line loss rate is high;
(3) change-to-user information mismatch: in the associated distribution areas, the power sale amount of one distribution area is less, the corresponding line loss rate is higher than an actual value, the power sale amount of the other distribution area is more, and the line loss rate is lower than the actual value;
(4) gateway table CT transformation ratio error: if the actual CT variation ratio is higher than the variation ratio used in the calculation of the original power supply amount, the original power supply amount is counted less, and the line loss rate statistic value is close to a 0 value or is negative; otherwise, the line loss rate statistical value of the transformer area is an abnormally high value;
(5) serious electricity stealing problem: in this case, the electricity is sold less, and the line loss rate is high.
It should be noted that the above-mentioned administrative problems (1) to (4) are not taken into account in the reasonable range evaluation of the line loss rate of the transformer area; in the abnormal range of the line loss rate of the transformer area, the problem of high line loss rate caused by three-phase unbalance and insufficient reactive compensation of the transformer area is not considered, and the high value of the line loss rate caused by the two factors is a high value reflecting the true level of the technical line loss rate and does not belong to an abnormal value (distortion value).
In view of the above, the station area line loss rate abnormality determination threshold should be a limit value that the true station area technical line loss rate may reach without considering the above-described administrative problems (1) to (4). Note that there are two thresholds for determining the line loss rate anomaly of the distribution room: one is a threshold between reasonable high loss rate-abnormal high loss rate, called upper threshold; the other is a threshold between reasonably low line loss rate-abnormally low line loss rate, called the lower threshold. The lower threshold value can be set to 0%, which is the lower limit level of the line loss rate which cannot be reached when the transformer area is in variable voltage and no load; while the setting of the upper threshold value is to be further analyzed.
Measurement and calculation of upper threshold for abnormal line loss rate judgment of transformer area
In the reasonable range evaluation of the line loss rate, the reasonable difference of factors such as the length of a trunk line in a transformer area, the load distribution, the actual load rate of a transformer and the like is fully calculated. Therefore, when the non-abnormal upper threshold value is set, the problems of three-phase load unbalance and insufficient reactive power compensation are mainly considered. According to the statistical result of a certain area, the current transformer area with the unbalance degree of the three-phase load being less than or equal to 15% in the low-voltage transformer area is only about 13%, and the problem of unbalance of the three-phase load is serious; and from the power factor measured by the gateway table, the power factor of more than 99.98% of the station areas is more than or equal to 0.85. Therefore, when the line loss rate is measured and calculated by the upper threshold value of non-abnormity, the two factors have different abnormal and non-abnormal measuring standards, specifically:
(1) influence of three-phase load unbalance degree: the three-phase current unbalance degree required by the power industry specification is less than or equal to 0.15 as constraint, the corresponding phase unbalance coefficient is (1.08, 0, 0.92), and the line loss rate of the transformer area is increased by 2.6773 times relative to the three-phase balance condition at most. In the non-abnormal upper bound value measurement and calculation, the most serious condition of three-phase load unbalance is considered, and the phase unbalance coefficient beta is calculatedA、βB、βCIs (2, -1, -1), and the line loss rate of the transformer area is increased by at most 6 times compared with the three-phase equilibrium condition.
(2) Insufficient reactive compensation: and still using the power factor more than or equal to 0.85 at the gateway table as a standard, determining that the standard is normal, otherwise, determining that the standard is abnormal.
The criterion for obtaining the abnormal line loss rate of various transformer areas according to the standard measurement and calculation is shown in the following table.
TABLE 1 line loss rate abnormity criterion for transformer area
Figure BDA0001426930080000041
Figure BDA0001426930080000051
Figure BDA0001426930080000061
Abnormal line loss rate appearance of transformer area
Fig. 4-1 is a schematic diagram of a line loss rate being continuously zero, fig. 4-2 is a schematic diagram of a line loss rate being stable and too large, fig. 4-3 is a schematic diagram of a line loss rate being stable and negative, fig. 4-4 is a schematic diagram of an abnormal line loss rate for several months, and fig. 4-5 is a schematic diagram of a line loss rate being suddenly high and suddenly low.
Specifically, as shown in fig. 4-1 to 4-5, the appearance of the line loss rate abnormality of the distribution area includes the following:
(1) the line loss rate is zero: the line loss rate is zero for all or part of the months. And setting the line loss rate to be zero when the power supply amount is zero according to a program of a line loss fine platform. Therefore, the abnormality is mostly that the measured power supply amount is zero due to the abnormal wiring of the gateway table.
(2) The line loss rate is stable and too large: the line loss rate of the cell area usually exceeds 50% continuously and even reaches 100%. The line loss rate is very large and often corresponds to certain administrative problems (such as the user-to-user mismatch of a large user).
(3) The line loss rate is stable and negative: the line loss rate persistence is negative, usually due to some technical (e.g., wrong connection of the gateway table) or administrative (e.g., mismatch of the subscriber-to-subscriber information for a large subscriber) problem.
(4) The line loss rate is suddenly high and suddenly low: the line loss rate of the transformer area is suddenly high and suddenly low, even suddenly positive and suddenly negative. Such line loss rate anomalies are a result of a combination of causes and are very common.
Possible reasons for the abnormal line loss rate of the transformer area are as follows:
the reasons for the abnormal line loss rate include two major problems of technical and managerial properties. The table 2 lists data representations corresponding to various abnormal causes and rough judgment bases thereof. Wherein:
(1) the technical reason for causing the abnormal line loss rate of the transformer area is that the wiring of a gateway table is abnormal, and the high line loss rate caused by factors such as unbalanced three-phase load, insufficient reactive compensation and the like belongs to the problem of unreasonable line loss rate (but the line loss rate can reflect the real level of the line loss of the transformer area and does not belong to distortion). The wiring abnormity of the gateway meter is divided into three types of no-voltage or no-current, reverse connection of an inlet and an outlet of a current transformer and alternate and wrong wiring, wherein:
a) pressure loss or flow loss: the wiring is often caused by poor contact (such as screw loosening and the like), and the voltage/current metering value of one phase or a plurality of phases is zero;
b) the inlet and the outlet of the current transformer are reversely connected: one or more phases of current are negative;
c) alternate wiring: comprises two-phase misconnection and three-phase misconnection. The three-phase wrong connection comprises three-phase forward wrong connection (such as connection of the A phase to the B phase, connection of the B phase to the C phase, and connection of the C phase to the A phase) and three-phase reverse wrong connection (such as connection of the A phase to the C phase, connection of the C phase to the B phase, and connection of the B phase to the A phase).
(2) Administrative problems that cause anomalies in the line loss rate of the cell are quite numerous, including:
a) the current transformer transformation ratio information of the gateway table is not matched: in this case, the line loss rate of the cell is a negative value of the persistence (when the actual CT transformation ratio is larger than the CT transformation ratio used for calculation) or a high value of the persistence (when the actual CT transformation ratio is smaller than the CT transformation ratio used for calculation).
b) Large user becomes user-user information mismatch: this situation usually occurs between two stations corresponding to the same distribution substation, where the line loss rate of one station has a high continuous value, while the line loss rate of the other station has a low continuous value (close to zero)/negative value, and there is a certain reverse correlation between the line loss rates of the two stations, i.e. so-called cancellation.
c) The success rate of centralized reading is low: the low success rate of centralized reading can result in high line loss rate in the month.
d) There is a serious problem of electricity stealing in the platform area: in this case, the line loss rate of the transformer area is high, but since the electricity stealing is in stages (for example, the electricity stealing in summer is more serious), the line loss of the transformer area is not necessarily a continuous high value.
Table 2 technical reasons for abnormal line loss rate of distribution room
Figure BDA0001426930080000081
Second, method for determining line loss rate abnormality composite cause
Aiming at the problem that the line loss rate is different and is often caused by compound reasons, the technical scheme provides the line loss rate abnormality analysis method capable of judging the compound reasons.
And (3) judging flow:
the general flow of identifying the cause of the line loss rate abnormality is shown in fig. 1 and 2. To identify the composite cause of the line loss rate anomaly, the following considerations are considered in the flowchart:
(1) the identification of technical reasons such as serious unbalance of three phases, insufficient reactive compensation and the like is not excluded. Although the three-phase load imbalance and the reactive power compensation insufficiency are not taken as the problems causing the line loss rate abnormity (distortion), the existence of the problems can cause the line loss rate statistic value of the transformer area to deviate from the reasonable range, and the identification process is terminated when the line loss rate of the transformer area can be corrected to the reasonable range. Therefore, the identification of these two technical problems and the corresponding correction of the line loss rate (i.e. the calculation of the value that the line loss rate of the station area may reach if these two problems do not exist) are also included in the identification process.
(2) The identification of the technical problem precedes the identification of the administrative problem, because the technical problem can be more accurately judged according to the measured value; in the technical problem identification, the wiring error of the gateway table is firstly identified, which is the statistic value that the wiring error of the gateway table can influence the three-phase unbalance degree and the power factor, and the analysis of the three-phase unbalance degree and the power factor is significant after the three-phase unbalance degree and the power factor are corrected according to the wiring problem of the gateway table.
(3) After analyzing and determining that some kind of problem exists in each step, correcting the line loss rate statistics value for the problem, and then continuing the determination of the subsequent problem based on the corrected line loss rate. In the analysis of the technical problem, some steps cannot be skipped (for example, the station area with negative line loss rate goes over the analysis of three-phase load imbalance) according to whether the current line loss rate exceeds the upper bound of the reasonable range or is lower than the lower bound of the reasonable range, which considers that two types of problems that the line loss rate is lowered and raised may exist in the station area at the same time.
(4) In the manageability problem, if the line loss rate statistic value of the transformer area is more reasonable, the lower bound of the range is the most problem that the CT transformation ratio is too low (the modulation ratio needs to be tried) or the transformer is not matched; on the contrary, if the line loss rate statistic value of the transformer area is more reasonable, the CT transformation ratio is too high, the transformer is not matched, and the problems of serious electricity stealing exist. If the line loss rate is still unable to be within a reasonable range after the above problems are eliminated, the station area structure can be determined (if the actual line length is far beyond the reasonable range).
The technical problem judgment and line loss correction method comprises the following steps:
the technical problems involved in fig. 3 include three aspects of fault-table wiring, three-phase load imbalance and insufficient reactive compensation (cos < 0.85).
Identification and line loss correction of wrong wiring of the gateway table:
the procedure and criteria for determining the miswiring of the gateway table are shown in fig. 3. The method for correcting the line loss under various wiring error conditions is implemented as follows:
(1) one phase is under pressure or flow loss condition:
when one phase is in voltage loss or current loss, the voltage or current of one phase is zero, and the measured active power is as follows:
Figure BDA0001426930080000101
and the active power under normal conditions is
Figure BDA0001426930080000102
Line loss correction factor of
Figure BDA0001426930080000103
And multiplying the line loss statistical value of the transformer area by the line loss correction coefficient to obtain the corrected transformer area line loss (the same below).
The reactive power measured in the event of a loss of voltage or current in one phase is
Figure BDA0001426930080000104
The power factor does not need to be rectified.
(2) Two-phase pressure or flow loss conditions:
when two phases are in voltage loss or current loss, the voltage or current of two phases is zero, and the measured active power is
Figure BDA0001426930080000105
Line loss correction factor of
Figure BDA0001426930080000106
The reactive power measured at this time is
Figure BDA0001426930080000107
The power factor also does not need to be rectified.
(3) Three-phase voltage loss or current loss condition:
when three phases are in voltage loss or current loss, the measured active power is zero. The power supply amount and the line loss rate statistic value of the transformer area are zero under the condition of three-phase current loss; for the three-phase voltage loss condition, the line loss of the corresponding transformer area can be estimated by considering that the three-phase voltage is always near the rated voltage
Figure BDA0001426930080000108
In the above formula, Uph,NPhase voltage rating, i.e., 0.22 kV; esSelling electricity in the month for the corresponding distribution area; because no data are measured on reactive power during three-phase current loss, the power factor of the transformer area cannot be corrected, and the average value of the power factors at the gateway side of the low-voltage transformer area can only be taken during line loss correction
Figure BDA0001426930080000111
It was found to be 96.93.
(4) The condition of reverse connection of the current transformer is as follows:
an active power measured at the time of reverse connection is
Figure BDA0001426930080000112
Line loss correction factor of
Figure BDA0001426930080000113
The reactive power measured at this time is
Figure BDA0001426930080000114
The power factor need not be corrected.
(5) The condition that two phases of the current transformer are connected reversely:
the active power measured when two phases are connected in reverse is
Figure BDA0001426930080000115
Line loss correction factor of
Figure BDA0001426930080000116
The reactive power measured at this time is
Figure BDA0001426930080000117
The power factor also does not need to be corrected.
(6) The condition of three-phase reverse connection of the current transformer is as follows:
the active power measured when the three phases are reversely connected is
Figure BDA0001426930080000118
Line loss correction factor of
Figure BDA0001426930080000119
The reactive power measured at this time is
Figure BDA0001426930080000121
The power factor also does not need to be corrected.
(7) Two-phase wrong wiring condition of the current transformer:
when the two phases of the current transformer are in wrong wiring, the measured active power is
Figure BDA0001426930080000122
At this time, the power supply amount statistical value is zero, and further the line loss rate statistical value is zero. Since the reactive power statistic is also zero, and the actual power factor is not known, the line loss of the transformer area can be estimated by the formula in (3).
(8) The condition of three-phase miswiring of the current transformer is as follows:
for the case of three-phase forward miswiring, the active power measured at this time is
Figure BDA0001426930080000123
Line loss correction factor of
Figure BDA0001426930080000124
The reactive power measured at this time is
Figure BDA0001426930080000125
Actual power factor angle of
Figure BDA0001426930080000126
Actual power factor of
Figure BDA0001426930080000127
In the above formula, the first and second carbon atoms are,
Figure BDA0001426930080000128
and (4) measuring values for the table of the power factor at the gateway side of the station area.
For a three-phase reverse miswiring situation, the amount of power supply measured at this time is
Figure BDA0001426930080000129
Line loss correction factor of
Figure BDA00014269300800001210
The reactive power measured at this time is
Figure BDA0001426930080000131
Actual power factor angle of
Figure BDA0001426930080000132
Actual power factor of
Figure BDA0001426930080000133
Wherein,
Figure BDA0001426930080000134
also a table measurement of the power factor at the gateway side of the cell.
The identification and line loss correction method of three-phase load unbalance comprises the following steps:
according to the three-phase current data called for and measured by the gateway table, the three-phase load unbalance degree can be calculated according to the following formula
Figure BDA0001426930080000135
Wherein, Imax、IminRespectively representing the maximum and minimum values of the three-phase current. The project adopts three-phase currents at different moments in three days on the gate table of the abnormal line loss rate distribution area, respectively calculates the unbalance degree index, and if the average value of the three unbalance degree indexes is the average value>15%, a serious three-phase load imbalance problem is considered to exist.
The line loss correction coefficient under the three-phase unbalance is
Figure BDA0001426930080000136
And dividing the actual measured line loss by the coefficient to obtain the line loss level of the target platform area under the condition that the three-phase load is strictly balanced.
The identification and line loss correction method of insufficient reactive compensation comprises the following steps:
according to the technical scheme, power factor values at three different moments of three days at the gateway side are adopted for the abnormal loss rate distribution area, and if the average value of the three values is less than 0.85, the problem that the corresponding distribution area is insufficient in reactive power compensation is solved.
Measured value of power factor at gateway side of current station area
Figure BDA0001426930080000137
(0.85), the loss correction factor is
Figure BDA0001426930080000141
The method for judging the manageability problem and correcting the line loss comprises the following steps:
administrative problems which may cause the line loss rate abnormality of the transformer area include mismatching of subscriber information of large users, mismatching of CT transformation ratio of gateway tables, low success rate of centralized meter reading, serious electricity stealing and the like.
The identification and line loss correction method for mismatching of the variable user information comprises the following steps:
the mismatching of the transformer substations mainly occurs between the transformer substations corresponding to the two transformers in the same station, and the transformer substations are called related transformer substations. The user matching analysis is only carried out on the relevant station areas. Traditionally, the unmatched inspection of the variant subscriber needs manual on-site inspection or a platform area identifier is used for inspection, and the project provides a covariance analysis method for the line loss rate of the related platform area so as to find out the platform area with the unmatched variant subscriber through data analysis. The specific method comprises the following steps: collecting line loss rate of related transformer areas (marked as transformer area i and transformer area j) in 12 months in one year, if the line loss rate meets the requirement
Figure BDA0001426930080000142
In the above formula,. DELTA.Ei,m% represents the line loss rate of the mth month of the conference area i,
Figure BDA0001426930080000143
the average value of the annual monthly line loss rate of the transformer area i. When the covariance is less than zero, it means that the line loss rates of the two cells are equal to each other, which is consistent with the characteristic of mismatch of subscribers. It should be noted that the above method is suitable for users with wrong information association, which are users with large power consumption, and this is also a main concern in the variable user mismatch analysis.
After two associated areas which are not matched with each other are found, the number of the large user with wrong information matching can be found by checking the running capacity of the large user, and the monthly power consumption of the user is set as EcThen, the line loss of the transformer area is corrected according to the following formula:
(1) for multiple electricity consumption EcIn a distribution room
ΔEx＝E0·ΔEm％+Ec
(2) For small amount of electricity consumption EcIn a distribution room
ΔEx＝E0·ΔEm％-Ec
In the above two formulae,. DELTA.ExShowing the corrected platform area line loss; e0Representing the monthly power supply amount of the platform area; delta EmThe% is the actual measurement of the line loss rate of the current month in the transformer area.
The identification and line loss correction method for mismatching of CT transformation ratio of gateway table comprises the following steps:
the CT transformation ratio used by the line loss refinement platform is the multiplying power in an EDCM system, and part of the problem exists in the inconsistent multiplying power in a PMS2.0 system. According to statistics, the CT transformation ratio is 40, 60, 80, 100, 120, 160, 200, 240, 300, 320, 400, 500, 600 and 640. When the line loss rate of the station area meets
Figure BDA0001426930080000151
Or
Figure BDA0001426930080000152
And then, making line loss rate correction measure suggestions for the unmatched CT transformation ratios for the corresponding distribution areas. In the above formula, γCTAnd gamma'CTRespectively, the CT transformation ratio used in the current EDCM system of the corresponding station area and the corrected CT transformation ratio, wherein the corrected transformation ratio is obtained by trying in the numerical sequence of the CT transformation ratios.
Accordingly, when the CT transformation ratio is changed from gammaCTCorrected to be gamma'CTWhen the platform area is in month, the loss is reduced according to the following formula
ΔEx＝E0·ΔEm％-E0·(γCT-γ'CT)
The identification and line loss correction method with low integrated reading success rate comprises the following steps:
at present, the average success rate of the low-voltage station area centralized meter reading can reach more than 90 percent, and if the power upsilon of a certain low-voltage station area is collected and read in the monthRMSIf the percentage is less than 90%, the low success rate of centralized reading is regarded as one of the factors causing the abnormal line loss rate of the transformer area.
If the success rate of the centralized meter reading in the transformer area can be improved to 100%, the line loss of the transformer area is corrected according to the following formula
Figure BDA0001426930080000153
In the above formula, the first and second carbon atoms are,
Figure BDA0001426930080000154
average power consumption of each user in the current month of the target station area, and when the data of the specific station area cannot be mastered, the value can be taken according to the power consumption structure; n iscIs the number of users in the target area.
The identification and line loss correction method for the serious electricity stealing problem comprises the following steps:
after correcting the line loss of all the above problems, if the line loss is still abnormal and large, it is considered to perform a search for users who steal electricity, and a multidimensional outlier analysis method with a tracing back function is proposed for this project, as described in section 5.3.8. The method is utilized to search out the suspected electricity stealing user set C in the current month of the target platform areasThen, the loss of the corresponding station area can be corrected in a pressing mode
Figure BDA0001426930080000161
In the above formula, χ% still represents the accuracy of the electricity stealing suspicious user searching method; ec,iRepresenting a set of users CsThe electricity consumption of the ith electricity stealing suspicious user in the current month.
According to the technical scheme, a defining standard of the line loss rate abnormity relative to the unreasonable (non-abnormal) line loss rate is determined, then an efficient judging process is constructed according to different data representations of the line loss rate abnormity caused by different factors, the line loss rate abnormity caused by various factors is analyzed and corrected, and the line loss rate abnormity analysis method capable of judging the compound reason is obtained.
The invention can be widely applied to the field of power supply operation and line loss management of low-voltage transformer areas.

Claims (5)

1. A method for judging the reason of the line loss rate abnormality of a low-voltage transformer area comprises the following steps of firstly determining a definition standard that the line loss rate abnormality is unreasonable or not abnormal relative to the line loss rate; then, constructing an efficient judging flow according to different data representations of the abnormal line loss rate caused by different factors, and analyzing and correcting the abnormal line loss rate caused by various factors; the method is characterized in that:
the method for judging the abnormal reason of the line loss rate of the low-voltage transformer area judges and corrects the line loss of the manageability problem after identifying the technical reason;
the managerial problems comprise the problems of unmatched large user subscriber information, unmatched CT transformation ratios of gateway tables, low centralized meter reading success rate and serious electricity stealing;
the method for judging the abnormal reason of the line loss rate of the low-voltage transformer area judges and corrects the line loss of the manageability problems according to the following steps:
step 1: judging that the line loss rate exceeds an upper threshold, if so, performing the step 2, and if not, turning to the step 4;
step 2: judging whether the line loss rate is qualified after the CT transformation ratio is reduced, if the line loss rate is qualified, performing the step 3, and if the line loss rate is unqualified, transferring to the step 5;
and step 3: correcting the line loss rate, and turning to the step 11;
and 4, step 4: judging whether the line loss rate is qualified after the CT transformation ratio is adjusted upwards, if so, performing the step 3, and if not, transferring to the step 10;
and 5: judging whether the problem of matching between users is existed or not, if so, performing the step 6, and if not, transferring to the step 7;
step 6: line loss rate correction is carried out, and if the line loss rate after correction is reasonable, the step is switched to step 11; if the line loss rate after correction is not reasonable, turning to step 7;
and 7: judging whether a serious electricity stealing problem exists or not, if so, performing a step 8, and if not, performing a step 9;
and 8: correcting the line loss rate; if the corrected line loss rate is reasonable, turning to the step 11; if the line loss rate after correction is not reasonable, turning to step 9;
and step 9: judging the abnormal structure of the transformer area, and turning to the step 11;
step 10: judging whether the problem of matching between users is existed or not, if so, performing the step 8, and if not, transferring to the step 9;
step 11: recording the searched problems and finishing the judgment;
when the matching of large user changing information is identified, a relevant station area line loss rate covariance analysis method is adopted, and a station area with a user-to-user mismatching is found out through data analysis;
when the CT transformation ratios of the gateway table are identified to be matched, line loss rate correction measure suggestions that the CT transformation ratios are not matched are made for corresponding distribution room areas;
when the serious electricity stealing problem is identified, a multi-dimensional outlier analysis method with a tracing function is adopted to search out a user set suspected of electricity stealing in the current month of the target transformer area.
2. The method for determining the cause of the line loss rate abnormality of the low-voltage distribution room as claimed in claim 1, wherein when determining the definition standard that the line loss rate abnormality is not reasonable or abnormal with respect to the line loss rate, the threshold for determining the line loss rate abnormality of the distribution room is two: one is a threshold between reasonable high loss rate-abnormal high loss rate, called upper threshold; the other is a threshold between reasonably low line loss rate-abnormally low line loss rate, called the lower threshold.
3. The method for determining the cause of the line loss rate abnormality of the low-voltage transformer area according to claim 1, wherein the lower threshold is set to 0%, and the upper threshold is set in consideration of the problems of the three-phase load unbalance degree and the insufficient reactive power compensation.
4. The method for determining the cause of the abnormal line loss rate of the low-voltage transformer area as claimed in claim 1, wherein the determination method comprises the steps of determining a technical problem and correcting the line loss, identifying unbalanced three-phase load and correcting the line loss, identifying insufficient reactive power compensation and correcting the line loss, identifying an administrative problem and correcting the line loss, identifying and correcting the unmatched subscriber information and line loss, identifying and correcting the unmatched CT transformation ratio of the gateway table and the unmatched line loss, identifying and correcting the line loss with low integration success rate and identifying and correcting the serious electricity stealing problem and correcting the line loss.
5. The method for determining the cause of the line loss rate abnormality of the low-voltage transformer area according to claim 1, wherein a composite method for identifying the cause of the line loss rate abnormality is provided, which can identify and correct the line loss rate abnormality caused by a plurality of causes including technical and managerial causes.
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