阅读说明：本技术 一种基于电压序列变点检测的户变关系校验方法 (Voltage sequence change point detection-based user variable relationship verification method ) 是由 唐冬来 张强 欧渊 刘俊 石金平 贺斌 颜涛 于 2020-06-15 设计创作，主要内容包括：本发明提出了一种基于电压序列变点检测的户变关系校验方法,本方法在采集了用户电表冻结数据后,首先通过线性插值的办法获得多个用户电表电压曲线的中间点,从而将多个用户电表时间轴校准为一致,然后将用户电表区分为三相用户电表和单相用户电表,对于单相用户电表,通过与电压总表进行突变时刻点变化数据进行比较,通过电压变化趋势和突变时刻点的重合数判断出单相用户电表属于电压总表的三相电压中具体的某一项,最后根据三相用户电表和单相用户电表的户变关系校验,建立户变关系分布矩阵。(The invention provides a method for verifying a user variable relationship based on voltage sequence variable point detection, which comprises the steps of acquiring intermediate points of voltage curves of a plurality of user electric meters by a linear interpolation method after freezing data of the user electric meters are acquired, calibrating time axes of the plurality of user electric meters to be consistent, dividing the user electric meters into three-phase user electric meters and single-phase user electric meters, comparing the single-phase user electric meters with change data of a voltage general table at a sudden change moment, judging that the single-phase user electric meters belong to a specific certain item in three-phase voltages of the voltage general table through a superposition number of voltage change trends and sudden change moment points, and finally verifying the user variable relationship according to the user variable relationship of the three-phase user electric meters and the single-phase user electric meters to establish a user variable relationship distribution matrix.)

1. A method for verifying a user variable relation based on voltage sequence variable point detection is characterized in that a 96-point voltage curve time axis of a user electric meter is calibrated, and then the accuracy of the user variable relation is verified through a voltage mutation time relation between a voltage summary table and the user electric meter.

2. The method as claimed in claim 1, wherein the accuracy of the household variable relationship is verified through a voltage jump time relationship between the voltage summary table and the user electric meters, and a voltage curve of each user electric meter is first generated, and a three-phase user electric meter and a single-phase user electric meter in the user electric meters are distinguished according to the voltage curve of the user electric meters.

3. The method as claimed in claim 2, wherein after the three-phase user electric meters and the single-phase user electric meters in the user electric meters are distinguished, the three-phase voltage data of 96 points per day of the voltage general meter are respectively compared with the sudden change time points of the voltages of all the single-phase user electric meters in the power distribution area; and comparing data conversion among all the sudden-change time points, and if the voltages of the single-phase user electric meter and the voltage summary table change in the same direction and the changing times are correspondingly consistent, and the superposition number of the sudden-change time points of the single-phase user electric meter and the voltage summary table is more than 90% of the total number of the sudden-change time points, judging that the compared data of the single-phase user electric meter belongs to a certain phase of the three phases of the voltage summary table.

4. The method as claimed in claim 1, wherein before calibrating the 96-point voltage curve time axis of the user electric meter, it is first required to collect the frozen voltage data of the user electric meter at 96 moments each day as the basis for the verification of the user variable relationship.

5. The voltage sequence change point detection-based user-variable relationship verification method of claim 1, wherein the calibrating the 96-point voltage curve time axis of the user electric meter is specifically performed by: and obtaining the middle points of the curves of the plurality of user electric meters by adopting a linear interpolation method, so that the time axes of the 96-point voltage curves of the plurality of user electric meters are completely consistent.

6. The method for verifying the household variable relationship based on the voltage sequence change point detection as claimed in claim 1, wherein after the accuracy of the household variable relationship is verified, a correlation sequence of the electric meters from near to far in each phase of the distribution area is formed, so that a distribution matrix of the household variable relationship is established.

Technical Field

The invention belongs to the technical field of phase verification of power distribution networks, and particularly relates to a household variable relation verification method based on voltage sequence variable point detection.

Background

In the conventional verification of the user variable relationship, the similarity of voltage sequence curves between the user tables is judged in manners of Pearson correlation coefficients, KNN algorithm and the like so as to verify the correctness of the user variable relationship. However, the above researches are limited to identification of the household transformation relationship of the distribution station measurement data in an ideal state, and the problems of measurement data errors caused by inconsistency of crystal oscillator clocks of electric meters and analysis of problems of signal crosstalk of the common zero line station area and the like are lacked.

In a distribution station area, voltage frequently fluctuates due to uncertainty of power consumption of an electric power customer, generally, electric meters which are close in electrical distance under the same phase have higher similarity of a voltage curve and lower similarity when the electrical distance is longer, a fraserer algorithm and a euclidean distance algorithm are adopted for carrying out household variable relation verification at present, but due to the fact that the two electric meters are far away, verification accuracy is low, for example, a phase voltage change interval of a total table A of a distribution transformer is 198V-236V, a change interval of a tail end electric meter is 215V-225V, change amplitudes of the two electric meters are inconsistent, and the household variable relation verification accuracy carried out by adopting the voltage curve is lower.

In the prior art, aiming at the problems of high manual verification cost and poor real-time performance of a low-voltage distribution network topological structure, a pure software online verification method of the low-voltage distribution network topological structure based on a Pearson correlation coefficient and a KNN algorithm is provided. Firstly, judging the similarity of a user voltage sequence curve by using a Pearson correlation coefficient, checking the correctness of the station area user-variable relation through a correlation coefficient algorithm, finding out a user with an incorrect user-variable relation, and checking again. Or the algorithm for calculating the similarity of the voltage curves, such as a Freusch method, Euclidean distance and the like, is adopted to realize identification of the household variable relationship, the problem of low accuracy exists, and the algorithm calculates the Freusch distances of the voltage sequences of different electric meters and the voltage sequence of the first electric meter to judge the relationship of the electric meters.

And judging the similarity of voltage sequence curves between the household meters by means of Pearson correlation coefficients, KNN (K nearest neighbor) algorithms, Freusch methods and the like so as to verify the correctness of the household variable relationship. However, such research is limited to identification of the user variation relationship of measurement data in a distribution area in an ideal state, that is, all electric meter clocks in the electric meters are uniform, and comparison is performed under the condition that acquired curve time axes are consistent. The method is realized by adopting a Freusch method to identify the distance between each user electric meter and the distribution transformer, and because the arrangement sequence of the plurality of electric meters is unknown in advance, the voltage change similarity of each phase (A, B, C three phases) is large, the identification of the relationship along the line of the user transformer is inaccurate;

the method is characterized in that identification of the household variable relationship is realized by adopting an algorithm for calculating voltage curve similarity such as Euclidean distance, the problem of low accuracy exists, the algorithm calculates the Frecher distance between different electric meter voltage sequences and a first electric meter voltage sequence to judge the relationship of the electric meters, but because the distance between the electric meters under the transformer is not fixed, if the distance between the two electric meters is long, the accuracy of verification is low, for example, the change interval of the A phase voltage of a total meter of a distribution transformer is 198V-236V, the change interval of a tail end electric meter is 215V-225V, the change amplitudes of the two are inconsistent, and the accuracy of household variable relationship verification by adopting the voltage curve is low.

Interpretation of terms:

changing points: the method includes the steps that observation data change conditions of an ammeter in a power distribution station area at a certain moment are referred to;

a power distribution station area: the distribution station area refers to the power supply range or area of one transformer;

the user-to-user relationship: and the connection relation of the electric meters under each phase in the power distribution station area.

Disclosure of Invention

The invention provides a method for verifying a user-variable relationship based on voltage sequence change point detection, aiming at the problem of low accuracy rate of the user-variable relationship verification in the prior art. According to the invention, the more accurate verification of the household transformation relation of the electricity meters in the power distribution area is realized through the operation.

The specific implementation method of the invention is as follows:

the invention provides a method for verifying a user variable relationship based on voltage sequence variable point detection.

In order to better implement the method, further, the accuracy of the user variable relationship is verified through the voltage sudden change time relationship between the voltage summary table and the user electric meters, a voltage curve of each user electric meter needs to be generated, and a three-phase user electric meter and a single-phase user electric meter in the user electric meters are distinguished according to the voltage curve of the user electric meters.

In order to better realize the method, after a three-phase user electric meter and a single-phase user electric meter in the user electric meters are distinguished, 96-point three-phase voltage data of a voltage general meter per day are respectively compared with all single-phase user electric meter voltage mutation time points in a power distribution area; and comparing data conversion among all the sudden-change time points, and if the voltages of the single-phase user electric meter and the voltage summary table change in the same direction and the changing times are correspondingly consistent, and the superposition number of the sudden-change time points of the single-phase user electric meter and the voltage summary table is more than 90% of the total number of the sudden-change time points, judging that the compared data of the single-phase user electric meter belongs to a certain phase of the three phases of the voltage summary table.

In order to better implement the method, before calibrating the 96-point voltage curve time axis of the user electric meter, firstly, frozen voltage data of the user electric meter at 96 moments each day needs to be collected to serve as a basis for checking the user variable relationship.

In order to better implement the present invention, further, the calibrating the 96-point voltage curve time axis of the user electricity meter is specifically performed by: and obtaining the middle points of the curves of the plurality of user electric meters by adopting a linear interpolation method, so that the time axes of the 96-point voltage curves of the plurality of user electric meters are completely consistent.

In order to better realize the method, after the accuracy of the user variable relationship is verified, a correlation sequence of the electric meter from near to far under each phase of the distribution area is formed, and therefore a user variable relationship distribution matrix is established.

Compared with the prior art, the invention has the following advantages and beneficial effects:

(1) the method for verifying the user-variable relationship based on voltage sequence variable point detection is adopted, and the problem of inaccurate user-variable relationship of the power distribution station area is solved. In the current method, the current household transformer line relationship is identified by identifying the distance between each user electric meter and a distribution transformer by a Freusch method, because the arrangement sequence of the plurality of electric meters is unknown in advance, the voltage change similarity of each phase (A, B, C three phases) is large, and the household transformer line relationship identification is inaccurate, the three-phase voltage data of 96 points of a total meter each day are respectively compared with all single-phase user electric meters in a distribution area, the data change conditions of the compared points are compared, and if the voltage changes (decreases or increases) in the same direction, the change moments are consistent; if the number of coincident points at the time of the change point between a certain phase of the summary table and the user meter is more than 90 percent of the total number, the user meter is considered to belong to the certain phase, and therefore an accurate user change relation is obtained;

(2) and obtaining intermediate points of the curves of the multiple electric meters by a linear interpolation method so as to ensure that the time axes of 96-point voltage curves of the multiple electric meters are completely consistent, all electric meter clocks in the electric meters are unified, and the acquired curve time axes are compared under the condition of consistency.

Drawings

FIG. 1 is a flow chart embodying the present invention;

FIG. 2 is a schematic diagram of the relationship between the voltage summary table and the three-phase and single-phase user electric meters.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and therefore should not be considered as a limitation to the scope of protection. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.