阅读说明：本技术 基于电压时间序列的配电台区户表相位关系校验方法 (Power distribution station area meter phase relation checking method based on voltage time sequence ) 是由 唐冬来 刘云杰 刘荣刚 欧渊 张强 沈磊 游传强 夏俊 郭晶 叶鸿飞 李佳骏 于 2019-11-15 设计创作，主要内容包括：本发明公开了基于电压时间序列的配电台区户表相位关系校验方法,对配电台区总表、用户电表一个电压数据所对应的电气参数进行动态时间调整,分别构建三相电压基础曲线和三相用户电表曲线,将三相电压基础曲线和三相用户电表曲线分析比较,判断三相电压基础曲线和三相用户电表曲线的曲线向量相似度是否大于90%并对曲线向量相似度大于90%的生成三相用户相位关系矩阵。本发明的有益效果是：本发明有效的解决了低压载波识别用户电表相位不准确的问题,有效的实现了多表的电气时间序列进行比对的问题。(The invention discloses a power distribution area household meter phase relation calibration method based on a voltage time sequence, which comprises the steps of carrying out dynamic time adjustment on an electrical parameter corresponding to voltage data of a power distribution area general meter and a user electric meter, respectively constructing a three-phase voltage basic curve and a three-phase user electric meter curve, analyzing and comparing the three-phase voltage basic curve and the three-phase user electric meter curve, judging whether the curve vector similarity of the three-phase voltage basic curve and the three-phase user electric meter curve is more than 90% or not, and generating a three-phase user phase relation matrix when the curve vector similarity is more than 90%. The invention has the beneficial effects that: the invention effectively solves the problem that the phase of the low-voltage carrier wave identification user ammeter is inaccurate, and effectively realizes the comparison of the electric time sequences of the multi-ammeter.)

1. A power distribution station area meter phase relation verification method based on a voltage time sequence is characterized in that: and (3) carrying out dynamic time adjustment on electrical parameters corresponding to voltage data of the general table of the distribution area and the user electric meter, respectively constructing a three-phase voltage basic curve and a three-phase user electric meter curve, analyzing and comparing the three-phase voltage basic curve and the three-phase user electric meter curve, judging whether the curve vector similarity of the three-phase voltage basic curve and the three-phase user electric meter curve is greater than 90%, and generating a three-phase user phase relation matrix for the curve vector similarity of greater than 90%.

2. The method for verifying the phase relationship of the distribution substation area meter based on the voltage time series as claimed in claim 1, wherein: the method specifically comprises the following steps:

step S1: obtaining two corresponding time sequence curves on a time axis in a certain time period;

step S2: carrying out dynamic time warping on the electrical parameters of all the electric meters in the distribution area;

step S3: constructing a three-phase voltage basic curve and a three-phase user electric meter curve according to the total meter phase;

step S4: analyzing and comparing the three-phase voltage basic curve and the three-phase user electric meter curve;

step S5: judging whether the curve vector similarity of the three-phase voltage basic curve and the three-phase user electric meter curve is less than 90%; if the value is less than 90%, returning to the step S4 to analyze and compare again;

if the time is greater than or equal to 90%, obtaining the optimal regular path after dynamic time regulation; step S6 is executed;

step S6: and generating a three-phase user phase relation matrix.

3. The method for verifying the phase relationship of the distribution substation area meter based on the voltage time series as claimed in claim 2, wherein: the step S1 specifically includes:

inputting voltage data of all general meters and household meters in a power distribution station area in one day, and setting two corresponding time sequence curves on a time axis in a certain time period:

x＝[x₁、x₂、x₃、…、x_n](1)

y＝[y₁、y₂、y₃、…、y_n](2)

wherein: x represents a time series curve of the summary table;

y represents the time series curve of the three-phase user table.

4. The method for verifying the phase relationship of the distribution substation area meter based on the voltage time series as claimed in claim 1, wherein: the step S2 specifically includes the following steps:

step S21: obtaining a voltage sequence before the total table is regulated through Pearson Correlation coeffient

In the above formula:

wherein:

step S22: a time series curve before the summary chart obtained in step S21 is normalizedAnd time series curve before three-phase user table is regulated

wherein: d is a distance matrix;

d_i,jthe optimal path before the normalization is carried out;

step S23: searching a path passing through a plurality of grid points in the distance matrix through a dynamic time adjustment algorithm, wherein the grid points passed by the path are aligned points calculated by the two sequences;

dynamic path D is defined as follows:

D＝D₁，D₂，D₃，...，D_k；max(m，n)≤k≤m+n-1 (10)

wherein: d_kTaking values of elements in the distance matrix;

step S24: setting the boundary limiting conditions of the regular path:

D₁＝d₁₁；D_k＝d_mn(11)。

step S25: setting the continuity and monotonicity limits of the regular path;

set D_n-1＝d_i，jGet the next point D for the regular path_nTaking values;

D_n∈[d_i+1，_j；d_i，_j+1；d_i+1，_j+1]。

5. the distribution substation area meter phase relationship verification method based on voltage time series according to claim 4, characterized in that: the step S3 specifically includes: obtaining a time series curve of the summary table after dynamic time warping and a time series curve of the three-phase user after dynamic time warping:

x′＝[x₁、x₂、x₃、…、x_n](6)

y′＝[y₁、y₂、y₃、…、y_m](7)；

wherein, x' is a time series curve of the general table after dynamic time warping;

y' is a time sequence curve of the three-phase user table after dynamic time warping;

and m is the number of the structured tables.

6. The method for verifying the phase relationship of the distribution substation area meter based on the voltage time series as claimed in claim 5, wherein: the optimal warping path obtained in step S5 specifically includes:

wherein DTW (x, y) represents the best warping path.

Technical Field

The invention relates to the technical field of household meter phase relation verification, in particular to a distribution substation household meter phase relation verification method based on a voltage time sequence.

Background

Interpretation of terms:

dynamic time warping: the power distribution station acquisition concentrator acquires the electrical parameters of the user ammeter in a carrier polling mode; in the data acquisition process, firstly, a polling mode, that is, a mode of asking for one answer to the electric meters is adopted, and the time points of acquiring each electric meter are inconsistent, so that the original voltage time sequences of a plurality of electric meters need to be normalized, that is, the time sequences are extended and shortened, the similarity of the two time sequences is extracted, and the voltage correlation of the electric meters is identified.

A power distribution station area: a distribution area refers to the supply range or area of a (single) transformer.

Low-voltage power line carrier: low voltage broadband carrier (LVPLC) communication is a special communication method for data transmission using a Low voltage power distribution line (380/220V subscriber line) as an information transmission medium. The technology loads information-carrying high-frequency signals on current, then transmits the information-carrying high-frequency signals through a low-voltage power distribution line (380/220V subscriber line), and a modulation and demodulation device of an acquisition concentrator separates the high-frequency signals from the current to obtain data information.

And (3) correcting the phase relation of the electric meter: and the voltage time sequences of the distribution substation general table and the household meter are obtained through dynamic time warping, and whether the phase relation of the user electric meter is accurate or not is verified through matching the similarity of the three-phase of the general table and the single-phase voltage time sequence vector of the user electric meter.

In a power frequency three-phase power supply system in China, the phase difference of three phases is 120 degrees, and the difference of a positive zero crossing point (or a reverse zero crossing point) of a three-phase alternating current signal in time is 6.67 ms. The phase identification can be completed by the acquisition concentrator sending a phase identification command. Firstly, acquiring time difference information of a frame sending time and a corresponding phase zero-crossing time carried in a phase identification frame sent by a concentrator; secondly, when the user table receives the phase identification frame, firstly, the time difference between the frame synchronization time and the zero-crossing time is calculated, then the time difference and the time difference in the frame information are used for calculating the time difference between the local zero-crossing time and the corresponding zero-crossing time, and the local phase can be judged through the time difference. After grouping, the subscriber table registers the phase information to the concentrator to obtain the subscriber relationship.

The method for identifying the phase relation of the user electric meters by transmitting the identification signals to the low-voltage power line carrier has the advantages that the identification success rate is low due to large signal attenuation of the user electric meters far away from the identification signal transmitting device; the condition that a plurality of distribution transformers in a distribution room share a zero line bus bar or a plurality of distribution transformers on the street side share the zero line exists in China, the identification signal of a concentrator is coupled to other distribution areas, the problem of cross-distribution area crosstalk occurs, in addition, in a cable of the distribution area, a phase identification signal can cross-phase coupling, the problem of cross-phase coupling of the identification signal is caused, and the identification success rate is low.

In a traditional method, when the acquisition concentrator acquires data of a low-voltage electric meter, a polling mode is adopted, namely, a mode of asking an answer to the electric meter is adopted, and the data of the next electric meter can be acquired only after the data acquisition of the current electric meter is completed. In addition, the low-voltage power line carrier networking process is a process for finding out a logical topological structure through an algorithm, if the conditions of flash, power failure and the like occur in a low-voltage power distribution network, a carrier networking terminal can be subjected to networking again, and the sequence of collecting user electric meters by a concentrator can be changed; thirdly, different electric meter manufacturers, different types and the like are used in the power distribution area, the electric quantity of the electric meter clock power supply battery is inconsistent, and the clock crystal oscillator has the condition of clock out-of-tolerance; finally, the electric parameter freezing precision of the electric meter is not high, and based on the reasons, the consistency comparison of the electric data time of the general meter and the user electric meter cannot be realized.

In the traditional low-voltage power line carrier recognition phase, because China has the condition that a plurality of distribution transformers in a distribution room share a zero line bus bar or a plurality of distribution transformers on the street side share a zero line, the recognition signal of a concentrator is coupled to other distribution areas, the problem of cross-distribution area crosstalk occurs, in addition, in a cable of the distribution area, the phase recognition signal can be cross-phase coupled to cause the problem of cross-phase coupling of the recognition signal, the success rate of the low-voltage power line carrier recognition phase is low, the method eliminates the influence of time sequence deviation and voltage amplitude deviation, and the accurate user ammeter phase relation is formed.

Disclosure of Invention

The invention aims to provide a power distribution station area meter phase relation checking method based on a voltage time sequence, which effectively solves the problem that the phase of a low-voltage carrier wave identification user meter is inaccurate, and effectively realizes the comparison of multi-meter electrical time sequences.

The invention is realized by the following technical scheme:

a power distribution station area meter phase relation verification method based on a voltage time sequence is characterized in that: and (3) carrying out dynamic time adjustment on electrical parameters corresponding to voltage data of the general table of the distribution area and the user electric meter, respectively constructing a three-phase voltage basic curve and a three-phase user electric meter curve, analyzing and comparing the three-phase voltage basic curve and the three-phase user electric meter curve, judging whether the curve vector similarity of the three-phase voltage basic curve and the three-phase user electric meter curve is greater than 90%, and generating a three-phase user phase relation matrix for the curve vector similarity of greater than 90%.

Further, in order to better implement the invention, the method specifically comprises the following steps:

step S1: obtaining two corresponding time sequence curves on a time axis in a certain time period;

step S2: carrying out dynamic time warping on the electrical parameters of all the electric meters in the distribution area;

step S3: constructing a three-phase voltage basic curve and a three-phase user electric meter curve according to the total meter phase;

step S4: analyzing and comparing the three-phase voltage basic curve and the three-phase user electric meter curve;

step S5: judging whether the curve vector similarity of the three-phase voltage basic curve and the three-phase user electric meter curve is less than 90%; if the value is less than 90%, returning to the step S4 to analyze and compare again;

if the time is greater than or equal to 90%, obtaining the optimal regular path after dynamic time regulation; step S6 is executed;

step S6: and generating a three-phase user phase relation matrix.

Further, in order to better implement the present invention, the step S1 specifically includes:

inputting voltage data of all general meters and household meters in a power distribution station area in one day, and setting two corresponding time sequence curves on a time axis in a certain time period:

x＝[x₁、x₂、x₃、…、x_n](1)

y＝[y₁、y₂、y₃、…、y_n](2)

wherein: x represents a time series curve of the summary table;

y represents the time series curve of the three-phase user table.

Further, in order to better implement the present invention, the step S2 specifically includes the following steps:

step S21: obtaining a voltage sequence before the total table is regulated through Pearson Correlation coeffient

And the voltage sequence before the three-phase user table is regulated

In the above formula:

wherein:

step S22: a time series curve before the summary chart obtained in step S21 is normalized

And three phasesTime series curve before user table normalizationThe optimal matching between the two curves is searched by zooming on a time axis, and a distance matrix d is constructed;

wherein: d represents a distance matrix;

d_i，jthe optimal path before dynamic regulation is obtained;

step S23: searching a path passing through a plurality of grid points in the distance matrix through a dynamic time adjustment algorithm, wherein the grid points passed by the path are aligned points calculated by the two sequences;

dynamic path D is defined as follows:

D＝D₁，D₂，D₃，...，D_k；max(m，n)≤k≤m+n-1 (10)

wherein: d_kTaking values of elements in the distance matrix;

step S24: setting the boundary limiting conditions of the regular path:

D₁＝d₁₁；D_k＝d_mn(11)。

step S25: setting the continuity and monotonicity limits of the regular path;

set D_n-1＝d_i，jGet the next point D for the regular path_nTaking values;

D_n∈[d_i+1，j；d_i，j+1；d_i+1，j+1]。

further, in order to better implement the present invention, step S3 specifically refers to: obtaining a time series curve of the summary table after dynamic time warping and a time series curve of the three-phase user after dynamic time warping:

x′＝[x₁、x₂、x₃、…、x_n](6)

y′＝[y₁、y₂、y₃、…、y_m](7)；

wherein, x' is a time series curve of the general table after dynamic time warping;

y' is a time sequence curve of the three-phase user table after dynamic time warping;

and m is the number of the structured tables.

Further, in order to better implement the present invention, the obtaining of the optimal warping path in step S5 specifically includes:

wherein DTW (x, y) represents the best warping path.

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

(1) according to the invention, through the dynamic time rule, the problem that voltage curves cannot be compared due to inconsistent collection time sequences of the user electric meters can be solved;

(2) the invention adopts the comparison of the general table and the user ammeter voltage sequence similarity vector to avoid the signal crosstalk problem in low-voltage phase identification;

(3) the invention effectively solves the problem of inaccurate phase of the low-voltage carrier wave identification user ammeter;

(4) the invention effectively solves the problems that the time for collecting the electric data of the user electric meter by the concentrator is inconsistent and the electric time sequence data of a plurality of meters can not be compared.

Drawings

FIG. 1 is a flow chart of the operation of the present invention;

FIG. 2 is a time series curve of a summary table and a user table before dynamic time warping is adopted in the present invention;

FIG. 3 is a time series curve of the general table and the user table after the state time warping is adopted in the present invention.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.