Method for batch screening of wiring phase dislocation of three-phase user metering device

Abstract

The invention provides a method for batch screening of wiring phase dislocation of three-phase user metering devices, and the method comprises the steps: obtaining the voltage and current data of three-phase users in the latest day and the frozen electric quantity data at the moment of 00: 00 of the current day and the second day for all three-phase users in a screening region; according to the obtained voltage and current data, the theoretical electricity consumption quantity of each user is calculated; respectively calculating the actual settlement electric quantity of each user; calculating a conformity coefficient of the theoretical electricity consumption quantity of the user and the actual settlement electricity quantity; screening users of which the conformity coefficient is greater than 1.5, and screening out the users for wiring phase dislocation of the metering device; according to the invention, the problems of large workload, low operation efficiency and long operation time of a traditional manual household-by-household screening method are solved.

Description

Technical Field

[0001] The invention relates to the technical field of electricity consumption monitoring, in particular to a method for batch screening of wiring mismatches of three-phase user metering devices. Background Art

[0002] In the power system, accurate energy metering is crucial for both power supply companies and users. Three-phase users usually have large power consumption and high power demand, and the accuracy of their metering devices is directly related to the fairness of electricity bill settlement and the stable operation and economic management of the power grid.

[0003] When the wiring of a three-phase user's metering device is mismatched, the electric energy value measured by the electric energy meter will not match the actual settled electricity, which will cause economic losses to the power supply company. The traditional method of manually checking the wiring of three-phase user metering devices one by one using measuring tools such as phase sequence meters is labor-intensive and time-consuming. For a large number of three-phase users, traditional methods are difficult to quickly and effectively perform batch screening, and it is impossible to detect and correct misphase problems in a timely manner. In addition, manual inspections are usually carried out periodically, and the misphase problems of the metering devices after the user's private modification cannot be discovered in a timely manner, resulting in the problem may exist for a long time. In order to ensure the timeliness and accuracy of electricity metering, there is an urgent need for an efficient, accurate, and real-time screening method to replace the traditional manual inspection method.

[0004] With the digital innovation of the power system, data platforms such as the power user electricity consumption information collection system have been widely used across the country. These advanced data platforms integrate a large amount of power data resources and realize the real-time collection, transmission, analysis and processing of power user electricity consumption information. In this context, the intelligence level of the power system has been continuously improved, which has made it possible to batch screen the mismatch of the wiring of the three-phase user metering device. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention can collect zero-fire current data in real time through the electric energy meter installed at the user end, and transmit it to the power user's electricity consumption information collection system for analysis. Using advanced data analysis algorithms, the inconsistency of zero-fire current can be quickly and accurately identified, greatly improving the monitoring efficiency and accuracy; at the same time, the digital identification method can also realize real-time early warning, promptly notify relevant personnel to handle, and effectively reduce potential risks.

[0006] The present invention adopts the following technical solution:

[0007] A method for batch screening of wiring mismatch of three-phase user metering devices, the method comprising the following steps:

[0008] For all three-phase users in the screening area, obtain the voltage and current data of the three-phase users in the most recent day and the power data frozen at 00:00 on the current day and the next day;

[0009] Calculate the theoretical power consumption of each user based on the acquired voltage and current data;

[0010] According to the frozen electricity data at zero o'clock on the day and the next day, the actual settlement electricity of each user is calculated respectively. The calculation formula is:

[0011] W S (i)=W2(i)-W1(i),i=1…N

[0012] Where: W S (i) is the actual settled electricity consumption of the i-th user; W1(i) is the electricity consumption data frozen at zero o'clock on the i-th user's day; W2(i) is the electricity consumption data frozen at zero o'clock on the next day of the i-th user;

[0013] Calculate the compliance coefficient between the user's theoretical electricity consumption and the actual settlement electricity consumption. The calculation formula is:

[0014] δ(i)=W L (i) / W S (i), i=1…N

[0015] Where: δ(i) is the compliance coefficient of the i-th user; W L (i) is the theoretical electricity consumption of the i-th user;

[0016] Screen out users whose compliance coefficient is greater than 1.5, and screen out users who have mis-phased wiring for metering devices.

[0017] Furthermore, the method for calculating the theoretical power consumption of each user according to the obtained voltage and current data is as follows:

[0018]

[0019] Where: i is the user ranking number; N is the number of three-phase users in the screening area; W L (i) is the theoretical power consumption of the i-th user; t is the sorting number of the voltage and current data; U A (i,t) is the t-th voltage value of the A phase voltage of the i-th user; I A (i, t) is the tth current value of the A phase current of the i-th user; U B (i, t) is the t-th voltage value of the B-phase voltage of the i-th user; I B (i, t) is the tth current value of the B phase current of the i-th user; U C(i, t) is the t-th voltage value of the C-phase voltage of the i-th user; I C (i, t) is the tth current value of the C phase current of the ith user.

[0020] Furthermore, after obtaining the voltage and current data of the three-phase users in the most recent day and the power data frozen at 00:00 on the same day and the next day, it is necessary to determine the number of valid points for collecting voltage, current and power data for each user;

[0021] When the number of valid points for collecting the user's voltage, current and power data is insufficient, the user is eliminated, the date of the user's historical data is pushed back one day, and the voltage, current and power data of the user are acquired again;

[0022] This process is repeated until the valid points of voltage, current and power collection of all users are qualified.

[0023] Furthermore, when determining the number of valid points for collecting user voltage, current and power data, the voltage and current data of three-phase users are collected every 15 minutes, a total of 96 times a day, and the power data is frozen only once at 00:00 every day.

[0024] The advantages and positive effects of the present invention are:

[0025] The present invention provides a method for batch screening of mismatched wiring of three-phase user metering devices. With the help of advanced sensor technology, data analysis algorithms and automation equipment, the efficiency and reliability of screening can be significantly improved and human resources can be saved, thus solving the problems of heavy workload, low operating efficiency and long operating time in traditional manual household screening methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of a method for batch screening of wiring mismatches in three-phase user metering devices in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, a method for batch screening of three-phase user metering devices with wrong wiring phases comprises the following steps:

[0030] (1) For all three-phase users in the screening area, select the historical data of the most recent day as the basis for analysis; export the voltage and current data of all three-phase users on the day in the power user power consumption information collection system and the frozen power data at 00:00 on the day and the next day to the database;

[0031] (2) Determine the number of valid points for collecting voltage, current and power data for each user; Under normal circumstances, in the power user power consumption information collection system, voltage and current data are collected every 15 minutes, a total of 96 times a day; power data is only frozen once at 00:00 every day. When special circumstances such as communication abnormalities occur, the user's voltage, current and power data will be incompletely collected;

[0032] (3) Eliminate users with insufficient number of valid points for voltage, current and power consumption in the database, move the date of historical data back one day, and re-import the voltage, current and power consumption data of these users from the power user electricity consumption information collection system into the database; repeat steps (2) and (3) until all users have qualified valid points for voltage, current and power consumption collection;

[0033] (4) Based on the obtained voltage and current data, the theoretical power consumption of each user is calculated using the following formula:

[0034]

[0035] Where: i is the user ranking number; N is the number of three-phase users in the screening area; W L (i) is the theoretical power consumption of the i-th user, in kW·h; t is the sorting number of the voltage and current data; U A (i,t) is the t-th voltage value of the A phase voltage of the i-th user, in kV; I A (i, t) is the t-th current value of the A phase current of the i-th user, in A; U B (i,t) is the t-th voltage value of the B phase voltage of the i-th user, in kV; I B (i, t) is the tth current value of the B phase current of the i-th user, in A; U C (i,t) is the t-th voltage value of the C-phase voltage of the i-th user, in kV; I C (i,t) is the tth current value of the C phase current of the i-th user, in A;

[0036] (5) Based on the frozen electricity data at zero o'clock on the current day and the next day, the actual settlement electricity of each user is calculated respectively. The calculation formula is:

[0037] W S (i)=W2(i)-W1(i),i=1…N

[0038] Where: W S (i) is the actual settlement power of the i-th user, in kW·h; W1(i) is the power data frozen at zero o'clock on the i-th user on the day, in kW·h; W2(i) is the power data frozen at zero o'clock on the next day, in kW·h;

[0039] (6) Calculate the compliance coefficient between the user's theoretical electricity consumption and the actual settlement electricity consumption. The calculation formula is:

[0040] δ(i)=W L (i) / W S (i), i=1…N

[0041] Where: δ(i) is the compliance coefficient of the i-th user;

[0042] Users with a compliance coefficient greater than 1.5 are screened and exported to an Excel document. The users in the Excel document are the users whose metering devices are wired in the wrong phase.

[0043] It should be noted that the reason for screening users with a compliance coefficient greater than 1.5 is that the compliance coefficient between the theoretical electricity consumption and the actual settled electricity consumption is usually about 1. However, when calculating the theoretical electricity consumption in step (4), since it is impossible to measure the power factor of all users, the power factor is simplified and set to an empirical value of 0.85 during the calculation process, so that the theoretical electricity consumption is an estimated value. At the same time, the zero-point freezing function of the user's electricity meter is not always able to freeze accurately at 00:00, and may appear to be ahead or lag for a few minutes, which will cause a deviation in the actual settled electricity consumption in step (5). In order to take into account both sensitivity and selectivity, the empirical value of the compliance coefficient of 1.5 is selected as the threshold for screening meter wiring errors. Once the compliance coefficient exceeds 1.5, it indicates that there is a meter wiring error problem.

[0044] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for batch screening of three-phase user metering devices with wrong wiring phases, characterized in that: The method comprises the following steps: For all three-phase users in the screening area, obtain the voltage and current data of the three-phase users in the most recent day and the power data frozen at 00:00 on the same day and the next day; Calculate the theoretical power consumption of each user based on the acquired voltage and current data; According to the frozen electricity data at zero o'clock on the day and the next day, the actual settlement electricity of each user is calculated respectively. The calculation formula is: W S (i)=W2(i)-W1(i),i=1…N Where: W S (i) is the actual settled electricity consumption of the i-th user; W1(i) is the electricity consumption data frozen at zero o'clock on the i-th user's day; W2(i) is the electricity consumption data frozen at zero o'clock on the next day of the i-th user; Calculate the compliance coefficient between the user's theoretical electricity consumption and the actual settlement electricity consumption. The calculation formula is: δ(i)=W L (i) / W S (i),i=1…N Where: δ(i) is the compliance coefficient of the i-th user; W L (i) is the theoretical electricity consumption of the i-th user; Screen out users whose compliance coefficient is greater than 1.5, and screen out users who have mis-phased wiring for metering devices.

2. A method for batch screening of three-phase user metering device wiring mismatch according to claim 1, characterized in that: Based on the obtained voltage and current data, the method for calculating the theoretical power consumption of each user is as follows: Where: i is the user ranking number; N is the number of three-phase users in the screening area; W L (i) is the theoretical power consumption of the i-th user; t is the sorting number of the voltage and current data; U A (i,t) is the t-th voltage value of the A phase voltage of the i-th user; I A (i, t) is the tth current value of the A phase current of the i-th user; U B (i, t) is the t-th voltage value of the B-phase voltage of the i-th user; I B (i, t) is the tth current value of the B phase current of the i-th user; U C (i, t) is the t-th voltage value of the C-phase voltage of the i-th user; I C (i, t) is the tth current value of the C phase current of the ith user.

3. A method for batch screening of three-phase user metering device wiring mismatch according to claim 1, characterized in that: After obtaining the voltage and current data of three-phase users in the most recent day and the power data frozen at 00:00 on the same day and the next day, it is necessary to determine the number of valid points for collecting voltage, current and power data for each user; When the number of valid points for collecting the user's voltage, current and power data is insufficient, the user is eliminated, the date of the user's historical data is pushed back one day, and the voltage, current and power data of the user are acquired again; This process is repeated until the valid points of voltage, current and power collection of all users are qualified.

4. A method for batch screening of three-phase user metering device wiring mismatch according to claim 3, characterized in that: When determining the number of valid points for collecting user voltage, current and power data, the voltage and current data of three-phase users are collected every 15 minutes, a total of 96 times a day, and the power data is frozen only once at 00:00 every day.

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