CN115541989A - Method for correcting electric quantity under condition that electric energy meter misconnection line metering power is 0 - Google Patents

Method for correcting electric quantity under condition that electric energy meter misconnection line metering power is 0 Download PDF

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Publication number
CN115541989A
CN115541989A CN202211132810.3A CN202211132810A CN115541989A CN 115541989 A CN115541989 A CN 115541989A CN 202211132810 A CN202211132810 A CN 202211132810A CN 115541989 A CN115541989 A CN 115541989A
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power
voltage
metering
current
formula
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Inventor
邓得政
王立伟
王端伟
张郁静
王小宇
潘海泉
赵望有
曹居澜
张超雄
强军伟
魏彬
吕政睿
耿梦莹
于媛媛
郭佳义
里佳格
蔡晨
刘锦涛
高佳玥
杨璐卿
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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Priority to CN202211132810.3A priority Critical patent/CN115541989A/en
Publication of CN115541989A publication Critical patent/CN115541989A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/001—Measuring real or reactive component; Measuring apparent energy
    • G01R21/002—Measuring real component
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/001—Measuring real or reactive component; Measuring apparent energy
    • G01R21/003—Measuring reactive component
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/006—Measuring power factor
    • 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 relates to a method for correcting electric quantity under the condition that the metering power of wrong wiring of an electric energy meter is 0, which comprises the following steps: 1. judging whether the error metering power is 0 or not by analyzing the wrong wiring form, and performing the step 2 under the condition that the error metering power is 0; 2. determining a corresponding adopted actual active power metering formula according to a specific wrong wiring form; 3. determining the time point of wrong wiring, and deriving P stored in the power acquisition system in the time point 1 、Q 1 、P 2 、Q 2 The equal power data is used for obtaining practical active power of each time period according to an actual power calculation formula; 4. obtaining actual active electric quantity through power summation; 5. and 4, subtracting the measured active electric quantity of the electric energy meter in the corresponding time from the actual active electric quantity obtained in the step 4 to calculate to obtain corrected electric quantity. Book (I)The invention solves the problem of calculating the corrected electric quantity when the metering power of the wrong wiring of the three-phase three-wire meter is 0.

Description

Method for correcting electric quantity under condition that electric energy meter misconnection line metering power is 0
Technical Field
The invention belongs to the technical field of electric energy metering, and particularly relates to a method for correcting electric quantity under the condition that the metering power of wrong wiring of an electric energy meter is 0.
Background
Wrong wiring of the electric energy meter can cause metering misalignment, and the accuracy and the reliability of electric energy metering are further influenced. Whether correct electric quantity can be accurately calculated after wrong wiring occurs is a problem which must be faced by electric power companies, and the problems are related to economic benefits between power supply and power utilization parties and also related to service quality and public image of the electric power companies.
The traditional method for calculating and correcting the electric quantity is mainly a correction coefficient method, and the basic principle of the method is that firstly, a metering power expression of a wrong wiring is obtained according to a wrong wiring form, then a correction coefficient is obtained through the ratio of the metering power expression of the correct wiring to the metering power expression of the wrong wiring, and then the actual electric quantity under the condition of the correct wiring is obtained by multiplying the recorded and copied electric quantity under the condition of the wrong wiring by the correction coefficient.
The correction coefficient method has the characteristics of simplicity, easiness in calculation and the like, so that the method is widely applied, but has a very obvious defect that when the metering power expression of wrong wiring is equal to 0, the correction coefficient and then the correction electric quantity cannot be obtained through the ratio of the power expression, and the problem cannot be solved by the correction coefficient method.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for correcting electric quantity under the condition that the wrong wiring metering power of an electric energy meter is 0.
The above object of the present invention is achieved by the following technical solutions:
a method for correcting electric quantity under the condition that the wrong wiring metering power of an electric energy meter is 0 is characterized by comprising the following steps:
step 1, judging whether the error metering power is 0 or not by analyzing the error wiring form, and performing step 2 under the condition that the error metering power is 0;
step 2, determining a corresponding adopted actual active power metering formula according to a specific wrong wiring form;
step 3, determining the time point of wrong wiring, and deriving P stored in the power utilization acquisition system in the time point 1 、Q 1 、P 2 、Q 2 The equal power data is used for obtaining practical active power of each time period according to an actual power calculation formula; wherein, P 1 、P 2 The active power measured by a first measuring element and a second measuring element of the electric energy meter is respectively represented; q 1 、Q 2 Respectively representing the reactive power measured by the first measuring element and the second measuring element;
step 4, obtaining actual active electric quantity through power summation;
and 5, subtracting the actual active electric quantity obtained in the step 4 from the active electric quantity measured by the electric energy meter in the corresponding time to calculate to obtain the corrected electric quantity.
And further: in the step 1, the three-phase three-wire metering wiring form is as follows: the voltage wiring has 6 forms in total, and 3 positive phases: abc, bca, cab; and 3 types of reverse phase sequences: acb, bac, cba; the current wiring has 8 forms: i is a 、I c ，-I a 、I c ，I a 、-I c ，-I a 、-I c ，I c 、I a ，-I c 、I a ，I c 、-I a ，-I c 、-I a (ii) a The three-phase three-wire electric meter has 6 x 8=48 connection forms, and the three-phase three-wire metering is only voltage abc and current I according to the related definition of electric energy metering a 、I c The wiring is in a correct wiring form, and the other 47 wiring forms are all wrong wiring; the metering power expression of 12 wiring forms in the wrong wiring forms is 0, and the metering power expression is respectively as follows: voltage abc, current Ic, ia; voltage abc, current-Ic, -Ia; voltage bca, current Ic, ia; voltage bca, current-Ic, -Ia; voltage cab, current Ic, ia; voltage cab, current-Ic, -Ia(ii) a Voltage acb, current Ia, ic; voltage acb, current-Ia, -Ic; voltage bac, current Ia, ic; voltage bac, current-Ia, -Ic; voltage cba, current Ia, ic; voltage cba, current-Ia, -Ic.
Further: in step 2, the establishment process of the measurement formula of the actual active power is as follows:
2.1, establishing an actual active power expression according to active power and reactive power of the three-phase three-wire electric energy meter:
the metering formulas of active power and reactive power of the three-phase three-wire electric energy meter are respectively as follows:
Figure BDA0003850648600000021
Figure BDA0003850648600000022
wherein, P 1 、P 2 Respectively representing active power respectively measured by the first measuring element and the second measuring element;
Figure BDA0003850648600000023
a and c are two-phase currents respectively,
Figure BDA0003850648600000024
line voltages between a and b phases and between b and c phases respectively;
Figure BDA0003850648600000025
the angle between the voltage and the current when the first metering element meters the active power,
Figure BDA0003850648600000026
measuring the angle between the voltage and the current when the second measuring element measures the active power;
Figure BDA0003850648600000027
is the power factor angle between the a-phase voltage and the current,
Figure BDA0003850648600000028
is the power factor angle between the c-phase voltage and the current; q 1 、Q 2 Respectively representing the reactive power measured by the first measuring element and the second measuring element;
Figure BDA0003850648600000029
are respectively as
Figure BDA00038506486000000210
A voltage phasor shifted by 90 °;
Figure BDA00038506486000000211
the angle between the voltage and the current when the reactive power is measured for the first measuring element,
Figure BDA00038506486000000212
measuring the angle between the voltage and the current when the reactive power is measured for the second measuring element;
when the three-phase voltage is balanced, the metering formula is as follows:
Figure BDA00038506486000000213
Figure BDA00038506486000000214
as can be seen from the above formula, P, Q and P 1 、Q 1 ，P 2 、Q 2 There is a relationship between them, and the formula can be expressed as follows:
P 0 ＝eP 1 +fQ 1 +gP 2 +hQ 2 (5)
2.2, calculating 12 actual active power expressions in the form of wrong wiring with the measured power expression of 0:
according to the formula (5), the calculation expression of the actual active power under the condition that the metering power of 12 wrong wiring lines of the three-phase three-line meter is 0 can be obtained:
1) Misconnection formula 1: voltage abc, currents Ic, ia
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (6):
Figure BDA0003850648600000031
the actual power expression P is obtained from the formula (6) 0 Comprises the following steps:
Figure BDA0003850648600000032
2) Wrong wiring form 2: voltage abc, current-Ic, -Ia
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 1, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000033
3) Miswiring form 3: voltage bca, current Ic, ia
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (9):
Figure BDA0003850648600000034
the actual power expression P is obtained from the formula (9) 0 Comprises the following steps:
Figure BDA0003850648600000041
4) Wrong wiring form 4: voltage bca, current-Ic, -Ia
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 3, and an actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000042
5) Wrong wiring form 5: voltage cab, current Ic, ia
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (12):
Figure BDA0003850648600000043
the actual power expression P is obtained from the formula (12) 0 Comprises the following steps:
Figure BDA0003850648600000044
6) Wrong wiring form 6: voltage cab, current-Ic, -Ia
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 5, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000045
7) Wrong wiring form 7: voltage acb, current Ia, ic
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (15):
Figure BDA0003850648600000046
the actual power expression P is obtained from the formula (15) 0 Comprises the following steps:
Figure BDA0003850648600000051
8) Wrong wiring form 8: the voltage acb, the current-Ia, -Ic
In the wrong wiring mode, the metering formula of the electric energy meter is opposite to the wrong wiring 7, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000052
9) Wrong wiring form 9: voltage bac, current Ia, ic
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (18):
Figure BDA0003850648600000053
the actual power expression P is obtained from the formula (18) 0 Comprises the following steps:
Figure BDA0003850648600000054
10 Wrong wiring form 10: voltage bac, current-Ia, -Ic
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 9, and an actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000055
11 Wrong wiring form 11: voltage cba, current Ia, ic
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (18):
Figure BDA0003850648600000056
the actual power expression P is obtained from the formula (21) 0 Comprises the following steps:
Figure BDA0003850648600000057
12 Wrong wiring form 12): voltage cba, current-Ia, -Ic
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 11, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000061
further: in step 3, the electric information acquisition system carries out measurement on the total active and reactive power (P, Q) of each metering element and the active and reactive power (P) of each metering element every 15min in one day 1 、Q 1 ，P 2 、Q 2 ) And collecting and storing.
Further: in step 4, the active power in each time period is known as P i Then, the electricity consumption W of the whole day can be obtained by summing:
Figure BDA0003850648600000062
further: in step 5, the expression for correcting the electric quantity is:
ΔW＝W-W p (25)
the invention has the advantages and positive effects that:
1. the method for correcting the electric quantity directly solves the actual power without solving the correction coefficient by changing the thought, accumulates the actual power in the wrong connection time period to obtain the actual active electric quantity, and then subtracts the active electric quantity measured by the electric energy meter to obtain the corrected electric quantity, thereby realizing the calculation of the corrected electric quantity when the wrong connection line measured power is 0.
2. The method can solve the problem of correcting the electric quantity calculation when the wrong wiring metering power of the three-phase three-wire meter is 0, is simple and convenient to calculate and wide in application range, perfects the calculation method for correcting the electric quantity, and also improves the accuracy and the applicability of the calculation method for correcting the electric quantity.
Drawings
FIG. 1 is a flow chart of a method of correcting power according to the present invention;
fig. 2 is a miswiring time node of an embodiment of the invention.
Detailed Description
The structure of the present invention will be further described by way of examples with reference to the accompanying drawings. It is to be understood that this embodiment is illustrative and not restrictive.
Referring to fig. 1, a method for correcting electric quantity when the wrong wiring measurement power of an electric energy meter is 0 is disclosed, which includes the following steps: the method is a novel method for calculating the three-phase three-wire meter wrong wiring correction electric quantity based on a metering formula and data of a power utilization information acquisition system. The method comprises the steps of calculating the actual active power by using the active power and the reactive power of two metering elements of the electric energy meter under the condition of wrong wiring, and accumulating and summing the power data stored by the power consumption information acquisition system to obtain the actual electric quantity. The method specifically comprises the following steps:
step 1, judging whether the error metering power is 0 or not by analyzing the error wiring form, and performing step 2 under the condition that the error metering power is 0, wherein the step specifically comprises the following steps:
three-phase three-wire measurement, the voltage wiring totally has 6 forms, and 3 positive phase sequences: abc, bca, cab; and 3 types of reverse phase sequences: acb, bac, cba; the current wiring has 8 forms: i is a 、I c ，-I a 、I c ，I a 、-I c ，-I a 、-I c ，I c 、I a ，-I c 、I a ，I c 、-I a ，-I c 、-I a . Therefore, the three-phase three-wire electric meter has 6 x 8=48 wiring forms, and the three-phase three-wire metering only has voltage abc and current I according to the related definition of electric energy metering a 、I c Is the correct wiring form, and the other 47 wiring forms are all wrongThe wiring, and the expression of the power measured by 12 wiring forms is 0, as shown in table 1:
TABLE 1 calculation power expression of 48 connections of three-phase three-wire meter
Figure BDA0003850648600000071
As can be seen from the above, the correction coefficient method is to obtain the actual electric quantity by multiplying the electric quantity measured by the electric energy meter by the correction coefficient, and the 12 wrong wires cannot calculate the correction coefficient because the measured power is 0, and thus the correction electric quantity cannot be solved by the correction coefficient.
Step 2, determining a corresponding adopted metering formula of the actual active power according to the specific wrong wiring form, wherein the establishment process of the metering formula of the actual active power is as follows:
2.1, establishing an actual active power expression according to active power and reactive power of the three-phase three-wire electric energy meter:
the metering formulas of active power and reactive power of the three-phase three-wire electric energy meter are respectively as follows:
Figure BDA0003850648600000072
Figure BDA0003850648600000081
wherein, P 1 、P 2 Respectively representing active power respectively measured by the first measuring element and the second measuring element;
Figure BDA0003850648600000082
a and c are two-phase currents respectively,
Figure BDA0003850648600000083
line voltages between a and b phases and between b and c phases respectively;
Figure BDA0003850648600000084
the angle between the voltage and the current when the first metering element meters the active power,
Figure BDA0003850648600000085
measuring the angle between the voltage and the current when the second measuring element measures the active power;
Figure BDA0003850648600000086
is the power factor angle between the a-phase voltage and the current,
Figure BDA0003850648600000087
is the power factor angle between the c-phase voltage and the current; q 1 、Q 2 The reactive power measured by the first measuring element and the second measuring element is respectively represented;
Figure BDA0003850648600000088
are respectively as
Figure BDA0003850648600000089
A voltage phasor shifted by 90 °;
Figure BDA00038506486000000810
the angle between the voltage and the current when the reactive power is measured for the first measuring element,
Figure BDA00038506486000000811
and measuring the angle between the voltage and the current when the reactive power is measured for the second measuring element.
Because three-phase voltage balance is the index of electric energy quality, so can regard three-phase voltage balance under general condition, when three-phase voltage balance, the measurement formula is:
Figure BDA00038506486000000812
Figure BDA00038506486000000813
from the above formula, it can be seen that P, Q and P 1 、Q 1 ，P 2 、Q 2 There is a relationship between them, and the formula can be expressed as follows:
P 0 ＝eP 1 +fQ 1 +gP 2 +hQ 2 (5)
it can also be seen that under the condition of three-phase voltage balance, only the calculation is needed
Figure BDA00038506486000000814
The actual active power of the electric energy meter can be obtained.
By P 0 Representing the actual active power. If P can be found 0 And P 1 、Q 1 ，P 2 、Q 2 P, Q, the actual power can be derived from the miswired form and the data measured under the miswired form.
2.2, calculating the actual active power expression of 12 wrong wiring forms with the metering power expression of 0:
according to the formula (5), a calculation expression of the actual active power under the condition that the 12 wrong wiring metering powers of the three-phase three-wire meter are 0 can be obtained, and the following sequential deduction is carried out according to the wrong wiring form:
1) Misconnection formula 1: voltage abc, currents Ic, ia
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (6):
Figure BDA0003850648600000091
the actual power expression P is obtained from the formula (6) 0 Comprises the following steps:
Figure BDA0003850648600000092
2) Miswiring form 2: voltage abc, current-Ic, -Ia
The misconnection wireIn the form, the metering formula of the electric energy meter is opposite to the wrong wiring 1, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000093
3) Miswiring form 3: voltage bca, current Ic, ia
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (9):
Figure BDA0003850648600000094
the actual power expression P is obtained from the formula (9) 0 Comprises the following steps:
Figure BDA0003850648600000095
4) Wrong wiring form 4: voltage bca, current-Ic, -Ia
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 3, and an actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000096
5) Wrong wiring form 5: voltage cab, current Ic, ia
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (12):
Figure BDA0003850648600000101
the actual power expression P is obtained from the formula (12) 0 Comprises the following steps:
Figure BDA0003850648600000102
6) Miswiring form 6: voltage cab, current-Ic, -Ia
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 5, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000103
7) Wrong wiring form 7: voltage acb, current Ia, ic
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (15):
Figure BDA0003850648600000104
the actual power expression P is obtained from the formula (15) 0 Comprises the following steps:
Figure BDA0003850648600000105
8) Miswiring line form 8: the voltage acb, the current-Ia, -Ic
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 7, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000106
9) Wrong wiring form 9: voltage bac, current Ia, ic
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (18):
Figure BDA0003850648600000111
the actual power expression P is obtained from the formula (18) 0 Comprises the following steps:
Figure BDA0003850648600000112
10 Wrong wiring form 10: voltage bac, current-Ia, -Ic
In the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 9, and an actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000113
11 Wrong wiring form 11: voltage cba, current Ia, ic
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (18):
Figure BDA0003850648600000114
the actual power expression P is obtained from the formula (21) 0 Comprises the following steps:
Figure BDA0003850648600000115
12 Wrong wiring form 12): voltage cba, current-Ia, -Ic
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 11, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure BDA0003850648600000116
table 2 shows the actual active power P in the above 12 wrong wiring forms 0 The calculation formula of (c).
TABLE 2 three-phase three-wire meter actual metering power expression under the condition that 12 kinds of wrong wiring metering power are 0
Figure BDA0003850648600000121
Step 3, determining the time point of wrong wiring, and deriving P stored in the power utilization acquisition system in the time point 1 、Q 1 、P 2 、Q 2 The equal power data is used for obtaining practical active power of each time period according to an actual power calculation formula, and specifically:
the power consumption information acquisition system is a system for acquiring, processing and monitoring power consumption information of power customers in real time, and can provide timely, complete and accurate basic power consumption data. The existing power utilization information acquisition system carries out measurement on the total active power and reactive power (P, Q) of each metering element and the active power and reactive power (P) of each metering element every 15min in one day 1 、Q 1 ，P 2 、Q 2 ) And collecting and storing. The actual active power of each time interval can be solved by means of the data stored in the acquisition system.
Step 4, obtaining the actual active electric quantity through power summation, specifically:
the active power in each time period is known as P i Then, the electricity consumption W of the whole day can be obtained by summing:
Figure BDA0003850648600000122
the electric load of most industrial and commercial users is relatively stable, and the active and reactive power values stored every 15min can basically reflect the power factor and the actual load condition of each time period. Through comparison and analysis, for most of power users, the difference between the electric quantity calculated by summing the power values and the electric quantity measured by the electric meter is not large, the error between the electric quantity and the electric quantity is small, and the electric quantity can be obtained through the accumulated power value.
Step 5, solving the corrected electric quantity, specifically:
calculating the corrected electric quantity delta W according to the actual active electric quantity obtained in the step 4 and the active electric quantity measured by the electric energy meter in the corresponding time, wherein the expression is as follows:
ΔW＝W-W p (25)
example (b):
suppose a certain metering point is at t s Mis-wiring occurs at time t e The time point is shown in fig. 2 when the correct wiring is corrected. Wherein A and B are each t s And t e The first acquisition point thereafter, D is the number of miswiring duration days on the day of occurrence and termination of removal. The actual active electric quantity under the condition of wrong wiring is as follows:
Figure BDA0003850648600000131
in the formula, W Pa The actual active electric quantity is obtained; Δ t s 、Δt e Are each t s To A and t e Number of minutes to B, P s,A-1 、P s,i 、P d,i 、P e,i 、P e,B-1 The actual active power of each acquisition time interval is obtained according to the expression in table 2.
Then the correction power is:
ΔW＝W pa -W p
in the formula, W P The active electric quantity measured by the electric energy meter during the wrong wiring period.
After the wrong wiring metering power is 0, the calculation of the corrected electric quantity can be carried out on the user according to the flow chart and the two formulas.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit of the invention and the scope of the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.

Claims (6)

1. A method for correcting electric quantity under the condition that the wrong wiring metering power of an electric energy meter is 0 is characterized by comprising the following steps:
step 1, judging whether the error metering power is 0 or not by analyzing the error wiring form, and performing step 2 under the condition that the error metering power is 0;
step 2, determining a corresponding adopted actual active power metering formula according to the specific wrong wiring form;
step 3, determining the time point of wrong wiring, and deriving P stored in the power utilization acquisition system in the time point 1 、Q 1 、P 2 、Q 2 The practical active power of each time period is obtained according to an actual power calculation formula by the aid of the equal power data, wherein P 1 、P 2 The active power measured by a first measuring element and a second measuring element of the electric energy meter is respectively represented; q 1 、Q 2 The reactive power measured by the first measuring element and the second measuring element is respectively represented;
step 4, obtaining actual active electric quantity through power summation;
and 5, subtracting the actual active electric quantity obtained in the step 4 from the active electric quantity measured by the electric energy meter in the corresponding time to calculate to obtain the corrected electric quantity.
2. The method of claim 1, wherein the method further comprises the step of correcting the electric quantity when the miswired power is 0: in the step 1, the three-phase three-wire metering wiring form is as follows: the voltage wiring has 6 forms in total, and 3 positive phases: abc, bca, cab; and 3 types of reverse phase sequences: acb, bac, cba; the current wiring has 8 forms: i is a 、I c ，-I a 、I c ，I a 、-I c ，-I a 、-I c ，I c 、I a ，-I c 、I a ，I c 、-I a ，-I c 、-I a (ii) a The three-phase three-wire electric meter has 6 x 8=48 connection forms, and the three-phase three-wire metering is only voltage abc and current I according to the related definition of electric energy metering a 、I c The wiring is in a correct wiring form, and the other 47 wiring forms are all wrong wiring; the metering power expression of 12 wiring forms in the wrong wiring forms is 0, and the metering power expression is respectively as follows: voltage abc, current Ic, ia; voltage ofabc, current-Ic, -Ia; voltage bca, current Ic, ia; voltage bca, current-Ic, -Ia; voltage cab, current Ic, ia; voltage cab, current-Ic, -Ia; voltage acb, current Ia, ic; voltage acb, current-Ia, -Ic; voltage bac, current Ia, ic; voltage bac, current-Ia, -Ic; voltage cba, current Ia, ic; voltage cba, current-Ia, -Ic.
3. The method of claim 2, wherein the method further comprises the step of correcting the electric quantity when the miswired power is 0: in step 2, the establishment process of the measurement formula of the actual active power is as follows:
2.1, establishing an actual active power expression according to active power and reactive power of the three-phase three-wire electric energy meter:
the metering formulas of active power and reactive power of the three-phase three-wire electric energy meter are respectively as follows:
Figure FDA0003850648590000011
Figure FDA0003850648590000021
wherein, P 1 、P 2 The active power measured by the first measuring element and the second measuring element is respectively represented;
Figure FDA0003850648590000022
a and c are two-phase currents respectively,
Figure FDA0003850648590000023
line voltages between a and b phases and between b and c phases respectively;
Figure FDA0003850648590000024
the angle between the voltage and the current when the first metering element meters the active power,
Figure FDA0003850648590000025
measuring the angle between the voltage and the current when the second measuring element measures the active power;
Figure FDA0003850648590000026
is the power factor angle between the a-phase voltage and the current,
Figure FDA0003850648590000027
is the power factor angle between the c-phase voltage and the current; q 1 、Q 2 The reactive power measured by the first measuring element and the second measuring element is respectively represented;
Figure FDA0003850648590000028
are respectively as
Figure FDA0003850648590000029
Voltage phasor shifted by 90 degrees;
Figure FDA00038506485900000210
the angle between the voltage and the current when the reactive power is measured for the first measuring element,
Figure FDA00038506485900000211
measuring the angle between the voltage and the current when the reactive power is measured for the second measuring element;
when the three-phase voltage is balanced, the metering formula is as follows:
Figure FDA00038506485900000212
Figure FDA00038506485900000213
as can be seen from the above formula, P, Q and P 1 、Q 1 ，P 2 、Q 2 Store betweenIn some relationship, the formula can be expressed as follows:
P 0 ＝eP 1 +fQ 1 +gP 2 +hQ 2 (5)
2.2, calculating the actual active power expression of 12 wrong wiring forms with the metering power expression of 0:
according to the formula (5), the calculation expression of the actual active power under the condition that the metering power of 12 wrong wiring lines of the three-phase three-line meter is 0 can be obtained:
1) Misconnection formula 1: voltage abc, currents Ic, ia
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (6):
Figure FDA00038506485900000214
the actual power expression P can be obtained from the formula (6) 0 Comprises the following steps:
Figure FDA0003850648590000031
2) Wrong wiring form 2: voltage abc, current-Ic, -Ia
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 1, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure FDA0003850648590000032
3) Miswiring form 3: voltage bca, current Ic, ia
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (9):
Figure FDA0003850648590000033
the actual power expression P can be obtained from the formula (9) 0 Comprises the following steps:
Figure FDA0003850648590000034
4) Wrong wiring form 4: voltage bca, current-Ic, -Ia
In the wrong wiring mode, the metering formula of the electric energy meter is opposite to the wrong wiring 3, and an actual power expression P can be obtained 0 Comprises the following steps:
Figure FDA0003850648590000035
5) Miswiring form 5: voltage cab, current Ic, ia
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (12):
Figure FDA0003850648590000036
the actual power expression P is obtained from the formula (12) 0 Comprises the following steps:
Figure FDA0003850648590000041
6) Wrong wiring form 6: voltage cab, current-Ic, -Ia
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 5, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure FDA0003850648590000042
7) Wrong wiring form 7: voltage acb, current Ia, ic
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (15):
Figure FDA0003850648590000043
the actual power expression P is obtained from the formula (15) 0 Comprises the following steps:
Figure FDA0003850648590000044
8) Wrong wiring form 8: the voltage acb, the current-Ia, -Ic
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 7, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure FDA0003850648590000045
9) Wrong wiring form 9: voltage bac, current Ia, ic
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (18):
Figure FDA0003850648590000046
the actual power expression P is obtained from the formula (18) 0 Comprises the following steps:
Figure FDA0003850648590000051
10 Wrong wiring form 10: voltage bac, current-Ia, -Ic
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 9, and an actual power expression P can be obtained 0 Comprises the following steps:
Figure FDA0003850648590000052
11 Wrong wiring form 11: voltage cba, current Ia, ic
In the wrong wiring mode, the power factor angle and the active and reactive power expressions of the two metering elements are shown as the formula (18):
Figure FDA0003850648590000053
the actual power expression P is obtained from the formula (21) 0 Comprises the following steps:
Figure FDA0003850648590000054
12 Wrong wiring form 12): voltage cba, current-Ia, -Ic
Under the wrong wiring form, the metering formula of the electric energy meter is opposite to the wrong wiring 11, and the actual power expression P can be obtained 0 Comprises the following steps:
Figure FDA0003850648590000055
4. the method of claim 3, wherein the method further comprises the step of correcting the electric quantity when the miswired power is 0: in step 3, the electric information acquisition system carries out measurement on the total active and reactive power (P, Q) of each metering element and the active and reactive power (P) of each metering element every 15min in one day 1 、Q 1 ，P 2 、Q 2 ) And collecting and storing.
5. The method of claim 4 for correcting the amount of electricity when the miswired metered power of the electric energy meter is 0, wherein: in step 4, the active power in each time period is known as P i The electricity consumption of the whole dayW can be found by summing:
Figure FDA0003850648590000056
6. the method of claim 5 for correcting the amount of electricity when the miswired metered power of the electric energy meter is 0, wherein: in step 5, the expression for correcting the electric quantity is:
ΔW＝W-W p (25)。
CN202211132810.3A 2022-09-06 2022-09-06 Method for correcting electric quantity under condition that electric energy meter misconnection line metering power is 0 Pending CN115541989A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116775731A (en) * 2023-08-25 2023-09-19 安徽南瑞中天电力电子有限公司 Sliding window-based calculation method for fault-connection trace-back electric quantity of three-phase electric energy meter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116775731A (en) * 2023-08-25 2023-09-19 安徽南瑞中天电力电子有限公司 Sliding window-based calculation method for fault-connection trace-back electric quantity of three-phase electric energy meter
CN116775731B (en) * 2023-08-25 2023-11-03 安徽南瑞中天电力电子有限公司 Sliding window-based calculation method for fault-connection trace-back electric quantity of three-phase electric energy meter

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