CN110261810B - Method for studying and judging types of low-voltage power users with reverse active electric quantity - Google Patents

Method for studying and judging types of low-voltage power users with reverse active electric quantity Download PDF

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CN110261810B
CN110261810B CN201910500083.3A CN201910500083A CN110261810B CN 110261810 B CN110261810 B CN 110261810B CN 201910500083 A CN201910500083 A CN 201910500083A CN 110261810 B CN110261810 B CN 110261810B
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low
voltage power
electric quantity
reverse active
active electric
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CN110261810A (en
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王立斌
张硕
白涛
张晶
王兆辉
樊晓辉
张益辉
杨郁
杨博
宋杨
戎士敏
刘保安
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State Grid Corp of China SGCC
State Grid Hebei Electric Power Co Ltd
Shijiazhuang Power Supply Co of State Grid Hebei Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Hebei Electric Power Co Ltd
Shijiazhuang Power Supply Co of State Grid Hebei Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current

Abstract

The invention discloses a method for studying and judging the type of a low-voltage power user with reverse active electric quantity, which relates to the technical field of power management; the method comprises the steps of analyzing the power consumption stored in a power consumption information acquisition system by a low-voltage power consumer with reverse active power quantity, and studying and judging the type of the low-voltage power consumer with the reverse active power quantity, wherein the type of the low-voltage power consumer with the reverse active power quantity is a distributed photovoltaic consumer, a low-voltage power consumer with wrong wiring of an electric energy meter, a low-voltage power consumer with electromagnetic braking equipment or a low-voltage power consumer with a fault of a metering device; the type of the low-voltage power users with the reverse active electric quantity is quickly and accurately determined by analyzing the power consumption and the like stored in the power consumption information acquisition system by the low-voltage power users with the reverse active electric quantity.

Description

Method for studying and judging types of low-voltage power users with reverse active electric quantity
Technical Field
The invention relates to the technical field of power management, in particular to a method for judging the type of a low-voltage power user with reverse active electric quantity.
Background
The low-voltage power consumer refers to a power consumer adopting 220V single-phase power supply or 380V three-phase power supply.
In actual work, the phenomenon that reverse active electric quantity exists in part of low-voltage power users is discovered, namely the reverse active electric quantity measured by the electric energy meter is not zero. Through field inspection, the low-voltage power users with wrong wiring of the distributed photovoltaic users, the electric energy meters, the low-voltage power users with electromagnetic braking equipment and the metering device can generate reverse active electric quantity.
Different types of low-voltage power consumers with reverse active power have different influences on the work of the power company, and different processing measures need to be taken, so that the types of the low-voltage power consumers with the reverse active power need to be determined in advance.
Since the low-voltage power users with reverse active electric quantity are geographically dispersed, and the mode of determining the types of the low-voltage power users by on-site checking not only consumes a large amount of manpower and material resources, but also has low efficiency, it is necessary to invent a method for studying and judging the types of the low-voltage power users with reverse active electric quantity so as to quickly and accurately determine the types of the low-voltage power users with reverse active electric quantity, thereby achieving the purposes of improving the working efficiency and saving the manpower and material resources.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for studying and judging the type of a low-voltage power user with reverse active electric quantity, which realizes the purpose of quickly and accurately determining the type of the low-voltage power user with the reverse active electric quantity by analyzing the power consumption and the like stored in a power consumption information acquisition system by the low-voltage power user with the reverse active electric quantity.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the method comprises the steps of analyzing the power consumption stored in a power consumption information acquisition system by low-voltage power users with reverse active electric quantity, and studying and judging the types of the low-voltage power users with the reverse active electric quantity, wherein the types of the low-voltage power users with the reverse active electric quantity are distributed photovoltaic users, low-voltage power users with wrong wiring of an electric energy meter, low-voltage power users with electromagnetic braking equipment or low-voltage power users with faults of a metering device.
The further technical scheme is as follows: it also comprises the following steps of,
s1 reading low-voltage power user information with reverse active power quantity
Reading reverse active electric quantity and forward active electric quantity of a low-voltage power user with reverse active electric quantity in a statistical period from a power utilization information acquisition system;
s2 studying and judging the type of low-voltage power consumer
S201 studying and judging distributed photovoltaic users
When the Pearson correlation coefficient of a reverse active electric quantity curve of a low-voltage power user with reverse active electric quantity in a statistical period and a generated energy curve of a known distributed photovoltaic user is between 0.75 and 1, judging that the low-voltage power user is a distributed photovoltaic user and executing the step S205;
s202 low-voltage power consumer for studying and judging wiring error of electric energy meter
When the low-voltage power consumer with the reverse active electric quantity is a single-phase low-voltage power consumer, only the reverse active electric quantity is generated, and the forward active electric quantity is not generated, judging that the single-phase low-voltage power consumer is a low-voltage power consumer with an electric energy meter wiring error, and executing S205; or when the low-voltage power consumer with the reverse active electric quantity is a three-phase low-voltage power consumer, and only the reverse active electric quantity is generated by one phase and the forward active electric quantity is not generated, determining that the three-phase low-voltage power consumer is a low-voltage power consumer with an electric energy meter wiring error and executing the step S205;
s203 studying and judging low-voltage power consumer with electromagnetic braking equipment
When the low-voltage power consumer with the reverse active electric quantity has both the forward active electric quantity and the reverse active electric quantity, the ratio of the reverse active electric quantity to the forward active electric quantity in one day is between 0% and 30%, and the variation coefficient of the ratio in the statistical period is between 0% and 25%, determining that the low-voltage power consumer is a low-voltage power consumer with electromagnetic braking equipment, and executing the step S205;
s204 low-voltage power consumer for studying and judging faults of metering device
Judging that the low-voltage power consumer with the reverse active electric quantity is a low-voltage power consumer with a metering device fault;
s205 ends the study of the low voltage power consumer type.
The further technical scheme is as follows: it also comprises the following steps of,
s3, if the research and judgment of all low-voltage power users with reverse active power quantity are completed, the step is shifted to S4; if the research and judgment on all the low-voltage power users with reverse active electric quantity is not completed, returning to the step S2;
s4 finishes the whole judging work.
The further technical scheme is as follows: the specific determination method in the step of S201 studying and determining the distributed photovoltaic users is,
when the correlation between a reverse active electric quantity curve of a low-voltage power user with reverse active electric quantity in a statistical period and a known generated energy curve of a distributed photovoltaic user in the same geographic area meets the formula (1), the low-voltage power user is judged to be the distributed photovoltaic user;
p>pset (1)
in the formula (1), p is a Pearson correlation coefficient of a reverse active electric quantity curve of a low-voltage power consumer and a generated energy curve of a known distributed photovoltaic consumer; p is a radical ofsetThe value range of the threshold is 0.75-1.
The further technical scheme is as follows: said p issetIs 0.75.
The further technical scheme is as follows: the method for calculating p is as follows,
Figure BDA0002089915760000031
in the formula (2), CbThe cycle reversal active power curve of the low-voltage power consumer is defined as follows,
Cb＝[Eb1,Eb2,…,Eb7] (3)
in the formula (3), the reverse active electric quantity E of the low-voltage power consumer from day 1 to day 7 in a weekb1～Eb7The power consumption information is obtained by a power consumption information acquisition system, and the unit of the power consumption information acquisition system is kWh;
in the formula (2), CaThe weekly power generation capacity curve of the known distributed photovoltaic users in the same geographic area is defined as follows,
Ca＝[Ea1,Ea2,…,Ea7] (4)
in the formula (4), the power generation amount E of the distributed photovoltaic users from 1 st day to 7 th day in a weeka1～Ea7The power consumption information is obtained by a power consumption information acquisition system, and the unit of the power consumption information acquisition system is kWh;
in the formula (2), the reaction mixture is,
Figure BDA0002089915760000032
is curve CbAverage value of each element in the table, which is stated in kWh, and calculation method thereofThe method is as follows,
Figure BDA0002089915760000041
in the formula (5), Ebi(i 1-7) is the reverse active electric quantity of the low-voltage power consumer on the ith day in a week, Ebi(i ═ 1 to 7) and the reverse active electric energy E of the low-voltage power consumer in formula (3) from day 1 to day 7 in one weekb1～Eb7Corresponding;
in the formula (2), the reaction mixture is,
Figure BDA0002089915760000045
is curve CaAverage value of each element in the group, which is kWh;
in the formula (2), the reaction mixture is,
Figure BDA0002089915760000046
is curve CbThe standard deviation of each element in the table is kWh, and the calculation method is as follows,
Figure BDA0002089915760000042
in the formula (2), the reaction mixture is,
Figure BDA0002089915760000043
is curve CaStandard deviation of each element in kWh.
The further technical scheme is as follows: the specific determination method in the step of S202 studying and determining the wiring error of the electric energy meter for the low voltage power consumer is,
the low-voltage power consumer with the reverse active power quantity is a single-phase low-voltage power consumer, the power consumption in the counting period simultaneously satisfies the formula (7) and the formula (8), or the low-voltage power consumer with the reverse active power quantity is a three-phase low-voltage power consumer, and when the power consumption of one phase in the counting period simultaneously satisfies the formula (7) and the formula (8), the low-voltage power consumer with the wrong wiring of the electric energy meter is judged;
Figure BDA0002089915760000044
in the formula (7), when the low-voltage power consumer with the reverse active power quantity is the single-phase low-voltage power consumer, EriThe reverse active electric quantity of the low-voltage power user on the ith day in the counting period is obtained; when the low-voltage power consumer with reverse active electric quantity is a three-phase low-voltage power consumer, EriThe reverse active electric quantity of the phase to be researched and judged in the ith day in the statistical period is provided for the low-voltage power user; n is the number of days of the statistical period, EriThe power consumption information is obtained by a power consumption information acquisition system, and the unit of the power consumption information acquisition system is kWh;
Figure BDA0002089915760000051
in the formula (8), when the low-voltage power consumer with the reverse active power quantity is the single-phase low-voltage power consumer, EfiThe forward active electric quantity of the low-voltage power user on the ith day in the counting period is obtained; when the low-voltage power consumer with reverse active electric quantity is a three-phase low-voltage power consumer, EfiDetermining the forward active electric quantity of the phase to be researched and judged in the ith day in the statistical period for the low-voltage power user; n is the number of days of the statistical period, EfiThe power consumption information acquisition system obtains the power consumption information in kWh.
The further technical scheme is as follows: the specific determination method in the step of S203 studying and determining the low voltage power consumer including the electromagnetic braking device is,
when the power consumption of the low-voltage power consumer with the reverse active power quantity in the statistical period simultaneously satisfies the formula (9) and the formula (10), the low-voltage power consumer is judged to be the low-voltage power consumer with the electromagnetic braking equipment;
ri≤30％ (9)
in the formula (9), riThe ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer on the ith day in the statistical period is defined as follows,
Figure BDA0002089915760000052
in the formula (11), EbiReverse active electric quantity of the low-voltage power user on the ith day in the statistical period, EpiObtaining forward active electric quantity of the low-voltage power user on the ith day in a statistical period, wherein the reverse active electric quantity and the forward active electric quantity are both obtained by a power utilization information acquisition system, and the unit is kWh;
CVr≤CVset (10)
in formula (10), CVrThe coefficient of variation of the ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer in the statistical period is defined as follows,
Figure BDA0002089915760000061
in the formula (12), N is the number of days of the statistical cycle, raThe average value of the ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer in the statistical period is calculated as follows,
Figure BDA0002089915760000062
in formula (10), CVsetIs a threshold value, and the value is 25%.
The further technical scheme is as follows: the method also comprises the following step of displaying the judged low-voltage power user type through a display.
The further technical scheme is as follows: the method also comprises the following step of printing the judged low-voltage power user type through a printer.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the method realizes the rapid research and judgment of the type of the low-voltage power consumer, is accurate and reliable, saves time and labor, improves the working efficiency and saves manpower and material resources.
See detailed description of the preferred embodiments.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of the correct wiring of the single-phase low-voltage electric power consumer electric energy meter according to the present invention;
FIG. 3 is a schematic diagram of the erroneous connection of a single-phase low-voltage electric power consumer electric energy meter according to the present invention;
FIG. 4 is a schematic diagram of the correct wiring of the three-phase low-voltage consumer power meter of the present invention;
FIG. 5 is a schematic diagram of the erroneous wiring of a three-phase low voltage consumer power meter according to the present invention;
fig. 6 is a graph of a cycle reversal active power curve in the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited to the specific embodiments disclosed below.
As shown in fig. 1, the present invention discloses a method for determining the existence of reverse active electric quantity low-voltage power consumer types, comprising the following steps,
the method comprises the steps of analyzing the power consumption stored in a power consumption information acquisition system by low-voltage power users with reverse active electric quantity, and studying and judging the types of the low-voltage power users with the reverse active electric quantity, wherein the types of the low-voltage power users with the reverse active electric quantity are distributed photovoltaic users, low-voltage power users with wrong wiring of an electric energy meter, low-voltage power users with electromagnetic braking equipment or low-voltage power users with faults of a metering device.
The specific steps are as follows,
s1 reading low-voltage power user information with reverse active power quantity
And reading the reverse active electric quantity and the forward active electric quantity of the low-voltage power user with the reverse active electric quantity in the statistical period from the power utilization information acquisition system.
S2 studying and judging the type of low-voltage power consumer
S201 studying and judging distributed photovoltaic users
And when the Pearson correlation coefficient of the reverse active electric quantity curve of the low-voltage power consumer with the reverse active electric quantity in the statistical period and the generating capacity curve of the known distributed photovoltaic consumer is between 0.75 and 1, judging that the low-voltage power consumer is the distributed photovoltaic consumer, and executing the step S205. Otherwise, the step S202 is executed.
The specific judgment method is that when the low-voltage power users located in the same geographic area and having reverse active electric quantity have correlation between a reverse active electric quantity curve of a statistical period and a known generated energy curve of distributed photovoltaic users, the low-voltage power users are judged to be distributed photovoltaic users.
p>pset (1)
In the formula (1), p is a Pearson correlation coefficient of a reverse active electric quantity curve of a low-voltage power consumer and a generated energy curve of a known distributed photovoltaic consumer; p is a radical ofsetIs a threshold value, which takes a value of 0.75.
The method for calculating p is as follows,
Figure BDA0002089915760000081
in the formula (2), CbThe cycle reversal active power curve of the low-voltage power consumer is defined as follows,
Cb＝[Eb1,Eb2,…,Eb7] (3)
in the formula (3), the reverse active electric quantity E of the low-voltage power consumer from day 1 to day 7 in a weekb1～Eb7The power consumption information acquisition system obtains the power consumption information in kWh.
In the formula (2), CaThe weekly power generation capacity curve of the known distributed photovoltaic users in the same geographic area is defined as follows,
Ca＝[Ea1,Ea2,…,Ea7] (4)
in the formula (4), the power generation amount E of the distributed photovoltaic users from 1 st day to 7 th day in a weeka1～Ea7The power consumption information acquisition system obtains the power consumption information in kWh.
In the formula (2), the reaction mixture is,
Figure BDA0002089915760000082
is curve CbThe average value of the elements in each case, expressed in kWh, is calculated as follows,
Figure BDA0002089915760000083
in the formula (5), Ebi(i 1-7) is the reverse active electric quantity of the low-voltage power consumer on the ith day in a week, Ebi(i ═ 1 to 7) and the reverse active electric energy E of the low-voltage power consumer in formula (3) from day 1 to day 7 in one weekb1～Eb7And correspondingly.
In the formula (2), the reaction mixture is,
Figure BDA0002089915760000091
is curve CaThe average value of the elements in the table is kWh.
In the formula (2), the reaction mixture is,
Figure BDA0002089915760000092
is curve CbThe standard deviation of each element in the table is kWh, and the calculation method is as follows,
Figure BDA0002089915760000093
in the formula (2), the reaction mixture is,
Figure BDA0002089915760000094
is curve CaStandard deviation of each element in kWh.
S202 low-voltage power consumer for studying and judging wiring error of electric energy meter
When the low-voltage power consumer is a single-phase low-voltage power consumer, only reverse active electric quantity is generated, and no forward active electric quantity is generated, the single-phase low-voltage power consumer is judged to be a low-voltage power consumer with a wrong wiring of the electric energy meter, and the step S205 is executed; or when the low-voltage power consumer is a three-phase low-voltage power consumer, and a certain phase only generates reverse active electric quantity and does not generate forward active electric quantity, determining that the three-phase low-voltage power consumer is a low-voltage power consumer with a wrong wiring of the electric energy meter, and executing the step S205. Otherwise, executing step S203.
The specific determination method is that the power consumption of the single-phase low-voltage power consumer with the reverse active power quantity in the statistical period simultaneously satisfies the formula (7) and the formula (8), or the power consumption of a certain phase of the three-phase low-voltage power consumer with the reverse active power quantity in the statistical period simultaneously satisfies the formula (7) and the formula (8), the low-voltage power consumer with the wrong wiring of the electric energy meter is determined.
Figure BDA0002089915760000095
In the formula (7), when the low-voltage power consumer with the reverse active power quantity is the single-phase low-voltage power consumer, EriThe reverse active electric quantity of the low-voltage power user on the ith day in the counting period is obtained; when the low-voltage power consumer with reverse active electric quantity is a three-phase low-voltage power consumer, EriThe reverse active electric quantity of the phase to be researched and judged in the ith day in the statistical period is provided for the low-voltage power user; n is the number of days of the statistical period, EriThe power consumption information acquisition system obtains the power consumption information in kWh.
Figure BDA0002089915760000101
In the formula (8), when the low-voltage power consumer with the reverse active power quantity is the single-phase low-voltage power consumer, EfiThe forward active electric quantity of the low-voltage power user on the ith day in the counting period is obtained; when the low-voltage power consumer with reverse active electric quantity is a three-phase low-voltage power consumer, EfiDetermining the forward active electric quantity of the phase to be researched and judged in the ith day in the statistical period for the low-voltage power user; n is the number of days of the statistical period, EfiThe power consumption information acquisition system obtains the power consumption information in kWh.
S203 studying and judging low-voltage power consumer with electromagnetic braking equipment
When the low-voltage power consumer has both forward active electric quantity and reverse active electric quantity, the ratio of the reverse active electric quantity to the forward active electric quantity in one day is between 0% and 30%, and the value of the variation coefficient of the ratio in the statistical period is less than or equal to 25%, it is determined that the low-voltage power consumer is a low-voltage power consumer including electromagnetic braking equipment, and step S205 is executed. Otherwise, executing step S204.
Specifically, the method for determining the power consumption of the low-voltage power consumer with the reverse active power quantity is that the low-voltage power consumer with the electromagnetic braking equipment is determined when the power consumption of the low-voltage power consumer in the statistical period simultaneously satisfies the formula (9) and the formula (10).
ri≤30％ (9)
In the formula (9), riThe ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer on the ith day in the statistical period is defined as follows,
Figure BDA0002089915760000102
in the formula (11), EbiReverse active electric quantity of the low-voltage power user on the ith day in the statistical period, EpiThe forward active electric quantity of the low-voltage power user on the ith day in the counting period is obtained, and the reverse active electric quantity and the forward active electric quantity are obtainedThe power and electricity quantity is obtained through an electricity consumption information acquisition system, and the unit of the power and electricity quantity is kWh.
CVr≤CVset (10)
In formula (10), CVrThe coefficient of variation of the ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer in the statistical period is defined as follows,
Figure BDA0002089915760000111
in the formula (12), N is the number of days of the statistical cycle, raThe average value of the ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer in the statistical period is calculated as follows,
Figure BDA0002089915760000112
in formula (10), CVsetIs a threshold value, and the value is 25%.
S204 low-voltage power consumer for studying and judging faults of metering device
And judging that the low-voltage power consumer with the reverse active electric quantity is the low-voltage power consumer with the fault of the metering device.
S205 ends the low voltage power consumer type study.
S3, if the research and judgment of all low-voltage power users with reverse active power quantity are completed, the step is shifted to S4; if the research and judgment on all the low-voltage power consumers with the reverse active power quantity are not completed, the step returns to the step of S2.
S4 finishes the whole judging work.
Description of the inventive concept:
the method is accurate and reliable, saves the field check link, improves the working efficiency of related personnel, and saves a large amount of manpower and material resources for power companies.
1. Distributed photovoltaic user study and judgment
Because the climate conditions in the same geographical area are basically the same, the power generation curves of the distributed photovoltaic systems in the same geographical area are strongly correlated. Therefore, when the correlation between the weekly reverse active electric quantity curve of a certain low-voltage power user with reverse active electric quantity in the statistical period and the weekly power generation curve of a certain known distributed photovoltaic user in the same geographic area meets the formula (1), the low-voltage power user is determined to be a distributed photovoltaic user.
p>pset (1)
(1) In the formula, p is a Pearson correlation coefficient of the low-voltage power consumer cycle reverse active electric quantity curve and a known distributed photovoltaic consumer cycle electric quantity curve in the same geographic area, and the calculation method is shown as the formula (2); p is a radical ofsetTo set the threshold, the invention takes 0.75 based on field-checked experience.
Figure BDA0002089915760000121
(2) In the formula, CbThe curve of the reverse active electric quantity of the low-voltage power consumer is defined as the formula (3); caDefining a weekly power generation curve of a certain known distributed photovoltaic user in the geographic area as shown in a formula (4); e denotes mathematical expectation, cov denotes covariance;
Figure BDA0002089915760000122
is curve CbThe average value of each element in the formula (5) is calculated;
Figure BDA0002089915760000123
the average value of each element in the curve Ca can be calculated by referring to the formula (5);
Figure BDA0002089915760000124
is curve CbStandard deviation of each element therein, whichThe calculation method is shown as the formula (6);
Figure BDA0002089915760000125
is curve CaThe standard deviation of each element in the formula (6) can be calculated.
Cb＝[Eb1,Eb2,…,Eb7] (3)
(3) In the formula, Eb1The reverse active electric quantity of the low-voltage power user on the 1 st day in the week, and so on, Eb2Reverse active electric power for the low voltage power consumer on day 2 of the week, Eb7The reverse active power of the low-voltage power consumer on the 7 th day in the week. Eb1-Eb7Can be obtained by a power consumption information acquisition system, and has the unit of kWh.
Ca＝[Ea1,Ea2,…,Ea7] (4)
(4) In the formula, Ea1The generated energy of the distributed photovoltaic users in the 1 st day of the week, and so on, Ea2The power generation capacity of the distributed photovoltaic users on day 2 in a week, Ea7The power generation capacity of the distributed photovoltaic users on the 7 th day in a week. Ea1-Ea7Can be obtained by a power consumption information acquisition system, and has the unit of kWh.
Figure BDA0002089915760000126
(5) In the formula, EbiThe reverse active electric quantity of the low-voltage power user on the ith day in a week can be obtained by an electric energy utilization information acquisition system, and the unit of the reverse active electric quantity is kWh.
Figure BDA0002089915760000131
(6) In the formula, EbiThe same formula (5) is defined.
2. Low-voltage power consumer research and judgment of wiring error of electric energy meter
The results of the on-site inspection are analyzed to find that: when a single-phase low-voltage power consumer with reverse active electric quantity only generates reverse active electric quantity and does not generate forward active electric quantity, the wiring of the electric energy meter of the single-phase low-voltage power consumer is wrong; when a three-phase low-voltage power consumer with reverse active electric quantity only generates reverse active electric quantity in one phase and does not generate forward active electric quantity, the corresponding phase connection of the electric energy meter of the three-phase low-voltage power consumer is wrong.
Therefore, when the power consumption of the single-phase low-voltage power consumer with the reverse active power quantity in the statistical period simultaneously satisfies the expressions (7) and (8), or the power consumption of a certain phase of the three-phase low-voltage power consumer with the reverse active power quantity in the statistical period simultaneously satisfies the expressions (7) and (8), the low-voltage power consumer with the wrong wiring of the electric energy meter is judged.
Figure BDA0002089915760000132
(7) Wherein, when the low-voltage power consumer with reverse active electric quantity is a single-phase low-voltage power consumer, EriThe reverse active electric quantity of the low-voltage power user on the ith day in the statistical period is defined as Ebi(ii) a When the low-voltage power consumer with reverse active electric quantity is a three-phase low-voltage power consumer, EriThe reverse active electric quantity of the phase to be researched and judged in the ith day in the statistical period is provided for the low-voltage power user; n is the number of days of the statistical period. EriCan be obtained by a power consumption information acquisition system, and has the unit of kWh.
Figure BDA0002089915760000133
(8) Wherein, when the low-voltage power consumer with reverse active electric quantity is a single-phase low-voltage power consumer, EfiThe forward active electric quantity of the low-voltage power user on the ith day in the counting period is obtained; when the low-voltage power consumer with reverse active electric quantity is a three-phase low-voltage power consumer, EfiDetermining the forward active electric quantity of the phase to be researched and judged in the ith day in the statistical period for the low-voltage power user; n is the number of days of the statistical period. EfiCan be used for dredgingThe unit of the power consumption information is kWh.
As shown in fig. 2, the single-phase low-voltage electric power consumer electric energy meter is correctly connected.
As shown in fig. 3, the single-phase low-voltage electric power consumer electric energy meter is in a wrong wiring mode.
In fig. 2 and 3, l1 and l2 are the live wire inlet terminal and the live wire outlet terminal of the electric energy meter, respectively; n1 and n2 are respectively a zero line incoming terminal and a zero line outgoing terminal of the electric energy meter; l1 and L2 are respectively a live wire incoming wire and a live wire outgoing wire of the power supply circuit; n1 and N2 are respectively a zero line incoming line and a zero line outgoing line of the power supply line.
As shown in fig. 4, the three-phase low-voltage electric power consumer electric energy meter is correctly connected.
As shown in fig. 5, the wrong wiring manner of the three-phase low-voltage electric power consumer electric energy meter takes a wrong wiring of a phase a as an example.
Since the wiring error of the three-phase low-voltage power consumer electric energy meter in the application refers to the wiring error of the current metering circuit, only the current metering circuit is drawn in fig. 4 and 5, and the voltage metering circuit is not drawn.
In fig. 4 and 5, La1 and La2 are respectively an a-phase current inlet terminal and an a-phase current outlet terminal of the electric energy meter; lb1 and Lb2 are respectively a B-phase current inlet terminal and a B-phase current outlet terminal of the electric energy meter; lc1 and Lc2 are respectively a C-phase current inlet terminal and a C-phase current outlet terminal of the electric energy meter; LA1 and LA2 are respectively an A-phase incoming line and an A-phase outgoing line of the current metering loop; LB1 and LB2 are respectively an incoming line and an outgoing line of the phase B of the current metering loop; LC1 and LC2 are respectively a C-phase incoming line and a C-phase outgoing line of the current metering circuit.
3. Low-voltage power consumer research and judgment method with electromagnetic braking equipment
The results of the on-site inspection are analyzed to find that: when a certain low-voltage power user has both forward active electric quantity and reverse active electric quantity, the ratio of the reverse active electric quantity to the forward active electric quantity in any day is between 0% and 30%, and the coefficient of variation of the ratio in a statistical period is small, the low-voltage power user is a low-voltage power user with electromagnetic braking equipment.
Therefore, when the electricity consumption of a certain low-voltage power consumer with reverse active electricity quantity in the statistical period simultaneously satisfies the expressions (9) and (10), the low-voltage power consumer is determined to be the low-voltage power consumer with the electromagnetic braking device.
ri≤30％ (9)
(9) In the formula, riAnd the ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer on the ith day in the statistical period is defined as shown in the formula (11).
CVr≤CVset (10)
(10) In the formula, CVrThe coefficient of variation of the ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer in the statistical period is defined as the formula (12); CV ofsetTo set the threshold, the present invention takes 25% based on field-checked experience.
Figure BDA0002089915760000151
(11) In the formula, EbiThe same formula (5) is defined; epiThe forward active electric quantity of the low-voltage power user on the ith day in the statistical period can be obtained by the power utilization information acquisition system, and the unit of the forward active electric quantity is kWh.
Figure BDA0002089915760000152
(12) Wherein N is as defined in formula (7); r isaThe calculation method is shown as (13) for the average value of the ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer in the statistical period.
Figure BDA0002089915760000153
(13) Wherein N is as defined in formula (7); r isiThe definition is the same as (9).
4. Low-voltage power consumer research and judgment of metering device fault
And if the certain low-voltage power user with the reverse active electric quantity does not meet the study and judgment conditions of the distributed photovoltaic user, the low-voltage power user with the wrong wiring of the electric energy meter and the low-voltage power user with the electromagnetic braking equipment, judging that the low-voltage power user is the low-voltage power user with the fault metering device.
Description of the steps:
and S1, reading the user numbers and names of all low-voltage power users with reverse active electric quantity and the forward active electric quantity in a statistical period from the power utilization information acquisition system.
S201, all low-voltage power users with reverse active electric quantity are sequentially researched and judged, and if the cycle reverse active electric quantity curve of the low-voltage power users meets the formula (1), the low-voltage power users are judged to be distributed photovoltaic users.
And S202, if the cycle reversal active power curve of the low-voltage power consumer with the reversal active power does not satisfy the expression (1), and the power consumption in the statistical period simultaneously satisfies the expressions (7) and (8), determining that the low-voltage power consumer with the wrong wiring of the electric energy meter is the low-voltage power consumer.
And S203, if the power consumption of the low-voltage power consumer with the reverse active power quantity in the statistical period does not satisfy the formula (1) or can not satisfy the formulas (7) and (8) at the same time, and if the power consumption in the statistical period satisfies the formulas (9) and (10) at the same time, the low-voltage power consumer is judged to be the low-voltage power consumer with the electromagnetic braking equipment.
And S204, if a certain low-voltage power consumer with reverse active electric quantity does not meet the study and judgment conditions of the distributed photovoltaic consumer, the low-voltage power consumer with the wrong wiring of the electric energy meter and the low-voltage power consumer containing the electromagnetic braking equipment, judging that the low-voltage power consumer is the low-voltage power consumer with the fault metering device.
S3, if the research and judgment of all low-voltage power users with reverse active electric quantity are completed, the step S4 is executed; if the research on all the users with reverse active power quantity low-voltage power is not completed, the step S2 is returned to.
And S4, finishing the judging work.
Calculation example:
a power supply company in a certain county has 5 low-voltage power users with reverse active power quantity, and the low-voltage power users are classified by the method, and the classification results are shown in table 1.
Table 1: classification result
Serial number User' s Classification result
1 C1 Low voltage power consumer with metering device failure
2 C2 Low-voltage power consumer with wrong wiring of electric energy meter
3 C3 Distributed photovoltaic users
4 C4 Low-voltage power consumer comprising electromagnetic braking device
5 C5 Distributed photovoltaic users
The amount of power used by user C1 is shown in table 2.
Table 2: c1 electric power consumption
Serial number Forward active electric quantity (kWh) Reverse active electric quantity (kWh)
1 44.21 80000.00
2 43.13 -85000.00
3 25.47 75000.21
4 28.43 20000.62
5 21.91 -78000.62
6 37.54 35000.00
7 45.11 43000.51
The reverse active power value of the user C1 is too large and is positive and negative. The collecting device is indeed failed by field verification.
The amount of power used by customer C2 is shown in table 3.
Table 3: c2 electric power consumption
Serial number Forward active power (kWh) Reverse active electric quantity (kWh)
1 0.00 29.01
2 0.00 27.23
3 0.00 27.85
4 0.00 30.08
5 0.00 28.48
6 0.00 28.19
7 0.00 27.12
The reverse active power of user C2 is not zero and the forward active power is always zero. The wiring of the electric energy meter is really wrong after field verification.
The amount of power used by user C3 is shown in table 4.
Table 4: c3 electric power consumption
Serial number Forward active electric quantity (kWh) Reverse active electric quantity (kWh)
1 0.01 31.80
2 0.02 31.19
3 0.01 24.75
4 0.01 25.13
5 0.02 30.18
6 0.01 31.00
7 0.01 31.74
The amount of power used by user C5 is shown in table 5.
Table 5: c5 electric power consumption
Serial number Forward active electric quantity (kWh) Reverse active electric quantity (kWh)
1 0.02 68.62
2 0.03 68.82
3 0.02 55.77
4 0.02 55.52
5 0.03 66.12
6 0.02 66.79
7 0.02 67.43
As shown in fig. 6, the cycle reversal active power curves of users C3 and C5. It can be seen that the weekly reverse active power curves of the users C3 and C5 are strongly correlated with the weekly power generation curves of the known distributed photovoltaic users, and the pearson correlation coefficients are calculated to be 0.92 and 0.95 respectively, and the users C3 and C5 are indeed distributed photovoltaic users through field verification.
The amount of power used by user C4 is shown in table 6.
Table 6: c4 electric power consumption
Serial number Forward active electric quantity (kWh) Reverse active electric quantity (kWh) Ratio of positive and negative active electric quantities
1 29.01 4.86 16.75％
2 27.23 4.39 16.12％
3 27.85 4.46 16.01％
4 30.08 4.91 16.32％
5 28.48 4.48 15.73％
6 28.19 4.52 16.03％
7 29.56 4.89 16.54％
As can be seen from table 6, the ratio of the reverse active power to the forward active power of the user C4 on any day is about 16%, and the coefficient of variation of the ratio in the statistical period is small, only 2.14%, and through field verification, the user C4 is a user who has an elevator, and the elevator has an electromagnetic braking function.
The same geographic area mentioned in the technical scheme of the application refers to the same village and town or the same county, and can also be the same local city.

Claims (9)

1. A method for judging the type of a low-voltage power user with reverse active electric quantity is characterized in that: analyzing the power consumption stored in the power consumption information acquisition system by the low-voltage power consumers with reverse active electric quantity, and studying and judging the types of the low-voltage power consumers with the reverse active electric quantity, wherein the types of the low-voltage power consumers with the reverse active electric quantity are distributed photovoltaic users, low-voltage power consumers with wrong wiring of an electric energy meter, low-voltage power consumers with electromagnetic braking equipment or low-voltage power consumers with faults of a metering device;
the method specifically comprises the following steps of,
s1 reading low-voltage power user information with reverse active power quantity
Reading reverse active electric quantity and forward active electric quantity of a low-voltage power user with reverse active electric quantity in a statistical period from a power utilization information acquisition system;
s2 studying and judging the type of low-voltage power consumer
S201 studying and judging distributed photovoltaic users
When the Pearson correlation coefficient of a reverse active electric quantity curve of a low-voltage power user with reverse active electric quantity in a statistical period and a generated energy curve of a known distributed photovoltaic user is between 0.75 and 1, judging that the low-voltage power user is a distributed photovoltaic user and executing the step S205;
s202 low-voltage power consumer for studying and judging wiring error of electric energy meter
When the low-voltage power consumer with the reverse active electric quantity is a single-phase low-voltage power consumer, only the reverse active electric quantity is generated, and the forward active electric quantity is not generated, judging that the single-phase low-voltage power consumer is a low-voltage power consumer with an electric energy meter wiring error, and executing S205; or when the low-voltage power consumer with the reverse active electric quantity is a three-phase low-voltage power consumer, and only the reverse active electric quantity is generated by one phase and the forward active electric quantity is not generated, determining that the three-phase low-voltage power consumer is a low-voltage power consumer with an electric energy meter wiring error and executing the step S205;
s203 studying and judging low-voltage power consumer with electromagnetic braking equipment
When the low-voltage power consumer with the reverse active electric quantity has both the forward active electric quantity and the reverse active electric quantity, the ratio of the reverse active electric quantity to the forward active electric quantity in one day is between 0% and 30%, and the variation coefficient of the ratio in the statistical period is between 0% and 25%, determining that the low-voltage power consumer is a low-voltage power consumer with electromagnetic braking equipment, and executing the step S205;
s204 low-voltage power consumer for studying and judging faults of metering device
Judging that the low-voltage power consumer with the reverse active electric quantity is a low-voltage power consumer with a metering device fault;
s205 ends the study of the low voltage power consumer type.
2. The method for determining the existence of the reverse active power low-voltage power consumer type according to claim 1, wherein the method comprises the following steps: it also comprises the following steps of,
s3, if the research and judgment of all low-voltage power users with reverse active power quantity are completed, the step is shifted to S4; if the research and judgment on all the low-voltage power users with reverse active electric quantity is not completed, returning to the step S2;
s4 finishes the whole judging work.
3. The method for determining the existence of the reverse active power low-voltage power consumer type according to claim 1, wherein the method comprises the following steps: the specific determination method in the step of S201 studying and determining the distributed photovoltaic users is,
when the correlation between a reverse active electric quantity curve of a low-voltage power user with reverse active electric quantity in a statistical period and a known generated energy curve of a distributed photovoltaic user in the same geographic area meets the formula (1), the low-voltage power user is judged to be the distributed photovoltaic user;
p＞pset (1)
in the formula (1), p is a Pearson correlation coefficient of a reverse active electric quantity curve of a low-voltage power consumer and a generated energy curve of a known distributed photovoltaic consumer; p is a radical ofsetThe value range of the threshold is 0.75-1.
4. The method for determining the existence of the reverse active power low-voltage power consumer type according to claim 3, wherein the method comprises the following steps: said p issetIs 0.75.
5. The method for determining the existence of the reverse active power low-voltage power consumer type according to claim 3, wherein the method comprises the following steps: the calculation method of p is shown as the formula (2),
Figure FDA0002829996030000021
in the formula (2), CbThe cycle reversal active power curve of the low-voltage power consumer is defined as follows,
Cb＝[Eb1,Eb2,…,Eb7] (3)
in the formula (3), the reverse active electric quantity E of the low-voltage power consumer from day 1 to day 7 in a weekb1～Eb7The power consumption information is obtained by a power consumption information acquisition system, and the unit of the power consumption information acquisition system is kWh;
in the formula (2), CaThe weekly power generation capacity curve of the known distributed photovoltaic users in the same geographic area is defined as follows,
Ca＝[Ea1,Ea2,…,Ea7] (4)
in the formula (4), the power generation amount E of the distributed photovoltaic users from 1 st day to 7 th day in a weeka1～Ea7The power consumption information is obtained by a power consumption information acquisition system, and the unit of the power consumption information acquisition system is kWh;
in the formula (2), the reaction mixture is,
Figure FDA0002829996030000033
is curve CbThe average value of the elements in each case, expressed in kWh, is calculated as follows,
Figure FDA0002829996030000031
in the formula (5), Ebi(i 1-7) is the reverse active electric quantity of the low-voltage power consumer on the ith day in a week, Ebi(i ═ 1 to 7) and the reverse active electric energy E of the low-voltage power consumer in formula (3) from day 1 to day 7 in one weekb1～Eb7Corresponding;
in the formula (2), the reaction mixture is,
Figure FDA0002829996030000034
is curve CaAverage value of each element in the group, which is kWh;
in the formula (2), the reaction mixture is,
Figure FDA0002829996030000035
is curve CbThe standard deviation of each element in the table is kWh, and the calculation method is as follows,
Figure FDA0002829996030000032
in the formula (2), the reaction mixture is,
Figure FDA0002829996030000036
is curve CaStandard deviation of each element in kWh.
6. The method for determining the existence of the reverse active power low-voltage power consumer type according to claim 1, wherein the method comprises the following steps: the specific determination method in the step of S202 studying and determining the wiring error of the electric energy meter for the low voltage power consumer is,
the low-voltage power consumer with the reverse active power quantity is a single-phase low-voltage power consumer, the power consumption in the counting period simultaneously satisfies the formula (7) and the formula (8), or the low-voltage power consumer with the reverse active power quantity is a three-phase low-voltage power consumer, and when the power consumption of one phase in the counting period simultaneously satisfies the formula (7) and the formula (8), the low-voltage power consumer with the wrong wiring of the electric energy meter is judged;
Figure FDA0002829996030000041
in the formula (7), when the low-voltage power consumer with the reverse active power quantity is the single-phase low-voltage power consumer, EriThe reverse active electric quantity of the low-voltage power user on the ith day in the counting period is obtained; when the low-voltage power consumer with reverse active electric quantity is a three-phase low-voltage power consumer, EriThe reverse active electric quantity of the phase to be researched and judged in the ith day in the statistical period is provided for the low-voltage power user; n is the number of days of the statistical period, EriThe power consumption information is obtained by a power consumption information acquisition system, and the unit of the power consumption information acquisition system is kWh;
Figure FDA0002829996030000042
in the formula (8), when the low-voltage power consumer with the reverse active power quantity is the single-phase low-voltage power consumer, EfiThe forward active electric quantity of the low-voltage power user on the ith day in the counting period is obtained; when the low-voltage power consumer with reverse active electric quantity is a three-phase low-voltage power consumer, EfiDetermining the forward active electric quantity of the phase to be researched and judged in the ith day in the statistical period for the low-voltage power user; n is the number of days of the statistical period, EfiThe power consumption information acquisition system obtains the power consumption information in kWh.
7. The method for determining the existence of the reverse active power low-voltage power consumer type according to claim 1, wherein the method comprises the following steps: the specific determination method in the step of S203 studying and determining the low voltage power consumer including the electromagnetic braking device is,
when the power consumption of the low-voltage power consumer with the reverse active power quantity in the statistical period simultaneously satisfies the formula (9) and the formula (10), the low-voltage power consumer is judged to be the low-voltage power consumer with the electromagnetic braking equipment;
ri≤30％ (9)
in the formula (9), riThe ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer on the ith day in the statistical period is defined as follows,
Figure FDA0002829996030000051
in the formula (11), EbiReverse active electric quantity of the low-voltage power user on the ith day in the statistical period, EpiObtaining forward active electric quantity of the low-voltage power user on the ith day in a statistical period, wherein the reverse active electric quantity and the forward active electric quantity are both obtained by a power utilization information acquisition system, and the unit is kWh;
CVr≤CVset (10)
in formula (10), CVrThe coefficient of variation of the ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer in the statistical period is defined as follows,
Figure FDA0002829996030000052
in the formula (12), N is the number of days of the statistical cycle, raThe average value of the ratio of the reverse active electric quantity to the forward active electric quantity of the low-voltage power consumer in the statistical period is calculated as follows,
Figure FDA0002829996030000053
in formula (10), CVsetIs a threshold value, and the value is 25%.
8. The method for determining the existence of the reverse active power low-voltage power consumer type according to any one of claims 1 to 7, wherein: the method also comprises the following step of displaying the judged low-voltage power user type through a display.
9. The method for determining the existence of the reverse active power low-voltage power consumer type according to any one of claims 1 to 7, wherein: the method also comprises the following step of printing the judged low-voltage power user type through a printer.
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