CN117269879B - Method for eliminating accumulated errors of intelligent ammeter - Google Patents
Method for eliminating accumulated errors of intelligent ammeter Download PDFInfo
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- CN117269879B CN117269879B CN202311270764.8A CN202311270764A CN117269879B CN 117269879 B CN117269879 B CN 117269879B CN 202311270764 A CN202311270764 A CN 202311270764A CN 117269879 B CN117269879 B CN 117269879B
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- 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 eliminating accumulated errors of an intelligent ammeter, which comprises the steps of detecting the intelligent ammeter at a power supply end on site by a worker, obtaining an accurate error coefficient of the intelligent ammeter at the power supply end, and correcting the intelligent ammeter at the power supply end; based on the existing intelligent electric meter at the power supply end, the intelligent electric meter at the power consumption end to be measured and the measuring resistance, the error coefficient ratio of the intelligent electric meter at the power consumption end to be measured and the intelligent electric meter at the power supply end is obtained, and the error coefficient of the intelligent electric meter at the power consumption end to be measured is calculated based on the error coefficient of the intelligent electric meter at the power supply end and the error coefficient ratio. The staff only need detect a smart electric meter of power supply end, only utilizes current metering equipment when remote monitoring error coefficient compares, need not additionally to insert standard metering equipment, has reduced remote monitoring's cost and has avoided the influence of standard metering equipment error to monitoring accuracy, has improved detection efficiency when having reduced staff's work load.
Description
Technical Field
The invention belongs to the field of intelligent ammeter error correction, and particularly relates to a method for eliminating accumulated errors of an intelligent ammeter.
Background
The economic development of China continues, the electricity consumption rises year by year, the intelligent ammeter is used as important equipment in the power grid, and the running state of the intelligent ammeter has great influence on the running benefit of the power grid. The intelligent ammeter is an important basis for settlement of electric quantity of both power supply and electricity consumption, the accuracy of metering of the intelligent ammeter is a basis for guaranteeing fairness of settlement of power supply and electricity consumption, errors can be generated in the using process of the intelligent ammeter, the deviation between an electric energy metering value and a true value is gradually increased due to accumulation of time, field correction of the intelligent ammeter is required to be carried out regularly, and the errors of the intelligent ammeter are controlled within an allowable range according to the technical standard requirements specified by China.
The existing intelligent ammeter error elimination method is characterized in that a worker carries professional detection equipment to go to the installation position of each intelligent ammeter, error detection and correction are carried out one by one, the workload of the worker is large, and the detection efficiency is low; the other is that standard metering equipment is arranged in a power grid to realize remote error detection and correction, the method needs more standard metering equipment and has higher cost, and because the standard metering equipment is in a power distribution network for a long time and is easily influenced by working environment factors to generate errors, metering data can deviate from standard values, so that the error detection precision of the intelligent ammeter is easily influenced by errors of the standard metering equipment.
Disclosure of Invention
The invention provides a method for eliminating accumulated errors of a smart meter, which aims to reduce the workload of workers, improve the efficiency, reduce the cost and solve the problems of detecting and correcting the errors of the smart meter with the detection precision.
The invention provides a method for eliminating accumulated errors of an intelligent ammeter, which is characterized by comprising the following steps:
s1, according to a first detection period, control signals are sent to a power supply end intelligent ammeter, a power consumption end intelligent ammeter to be detected and a first switch of the power consumption end to be detected at regular intervals,
s2, based on the control signal, switching the measuring resistor R S Obtaining the metering values of the power supply end intelligent ammeter and the power consumption end intelligent ammeter to be tested in different modes;
s3, calculating error coefficient ratio epsilon of the intelligent electric meter at the power consumption end to be tested and the intelligent electric meter at the power supply end based on the measured values of the intelligent electric meter at the power supply end and the intelligent electric meter at the power consumption end to be tested in different modes;
s4, judging whether the error coefficient ratio epsilon is in a preset range, if so, executing a step S5, and if not, executing a step S6;
s5, judging whether the correction time from the last power supply end intelligent ammeter exceeds a second detection period, if so, executing a step S6, and if not, enabling the power supply end intelligent ammeter and the power consumption end intelligent ammeter to be tested to be free from correction;
s6, the staff detects the intelligent ammeter at the power supply end on site to obtain an error coefficient r of the intelligent ammeter at the power supply end 1 ；
S7, error coefficient r based on intelligent ammeter at power supply end 1 And the error coefficient ratio epsilon, calculating an error coefficient r of the intelligent ammeter to be tested 2 ；
S8, based on the error coefficient r 2 Calculating correction parameters, and sending and storing the correction parameters to a to-be-detected deviceAnd the user side is provided with an intelligent ammeter.
Preferably, before the control signal is sent, only one electricity consumption terminal to be tested is reserved in the power distribution network, and the electricity consumption terminals except the electricity consumption terminal to be tested in the power distribution network are disconnected from the power distribution network.
Preferably, the control signal includes the switch switching signal, a metering start signal and a metering end signal; the switch switching signal is used for controlling the measuring resistor R S And after receiving the metering start signal, the power supply end intelligent ammeter and the power consumption end intelligent ammeter to be measured synchronously start metering.
Preferably, the switch switching signal is sent out earlier than the metering start signal; after the first switch is switched, the power supply end intelligent ammeter and the power consumption end intelligent ammeter to be tested synchronously start metering according to the received metering start signal; and the power supply end intelligent ammeter and the power consumption end intelligent ammeter to be measured synchronously stop metering according to the received metering ending signal.
Preferably, the switch switching signal is sent to the smart meter at the electricity consumption end to be measured, and the smart meter at the electricity consumption end to be measured controls the first switch to finish measuring the resistance R S Switching of access modes.
Preferably, the switching measuring resistor R S The access mode of (1) includes:
s21, switching to a first mode, and placing a first switch at a first position S1, wherein a first end of the intelligent ammeter at the electricity consumption end to be tested is connected with an output end of the power distribution network, and a second end of the intelligent ammeter at the electricity consumption end to be tested and a load R at the electricity consumption end to be tested are connected with each other L Is connected with the first end of the measuring resistor R S Is connected with the first end of the intelligent ammeter at the electricity end to be measured, and measures the resistance R S Second end of (2) and load R of electricity end to be measured L Is grounded;
s22, switching to a second mode, and placing the first switch at a second position S2, wherein the first end of the intelligent ammeter at the electricity consumption end to be tested is connected with the output end of the power distribution network, and the second end of the intelligent ammeter at the electricity consumption end to be tested and the load R at the electricity consumption end to be tested are connected with the power distribution network L Is connected with the first end of the measuring resistor R S The first end of the resistor R is connected with the second end of the intelligent ammeter at the electricity end to be measured S Second end of (2) and load R of electricity end to be measured L Is grounded;
s23, switching to a third mode, and placing the first switch at a third position S3, wherein the first end of the intelligent ammeter at the electricity consumption end to be tested is connected with the output end of the power distribution network, and the second end of the intelligent ammeter at the electricity consumption end to be tested and the load R at the electricity consumption end to be tested are connected with the power distribution network L Is connected with the first end of the load R of the electricity end to be measured L Is grounded at the second end of the measuring resistor R S And the power utilization terminal to be tested is not connected.
Preferably, when the power supply terminal is switched to the first mode, a metering period is used to obtain a metering value P of the power supply terminal intelligent ammeter M1 And the metering value P of the intelligent ammeter at the electricity consumption end to be measured N1 The method comprises the steps of carrying out a first treatment on the surface of the When the intelligent ammeter is switched to the second mode, a metering period is passed to obtain a metering value P of the intelligent ammeter at the power supply end M2 And the metering value P of the intelligent ammeter at the electricity consumption end to be measured N2 The method comprises the steps of carrying out a first treatment on the surface of the When the power supply terminal intelligent ammeter is switched to the third mode, a metering period is passed to obtain a metering value P of the power supply terminal intelligent ammeter M3 And the metering value P of the intelligent ammeter at the electricity consumption end to be measured N3 。
Preferably, the calculating the error coefficient ratio epsilon of the smart electric meter at the electricity consumption end to be measured and the smart electric meter at the electricity consumption end to be measured based on the measured values of the smart electric meter at the electricity consumption end to be measured and the smart electric meter at the electricity consumption end under different modes specifically comprises: calculating the error coefficient ratio epsilon based on the power supply end intelligent ammeter measurement value and the power consumption end intelligent ammeter measurement value to be tested in the first mode, the second mode and the third mode
Preferably, the power supply terminal intelligent ammeter and the power consumption terminal intelligent ammeter to be measured are respectively connected with a control center in a wireless communication mode, and the power supply terminal intelligent ammeter and the power consumption terminal intelligent ammeter to be measured are uploaded to the control center to obtain the measurement value according to the control signal.
Preferably, when the user side intelligent ammeter works normally, the first switch is in a normally closed state at the third position S3.
Compared with the prior art, the invention has the beneficial effects that:
according to the method for eliminating the accumulated errors of the intelligent ammeter, the intelligent ammeter at the power supply end can be detected on site by a worker, so that the accurate error coefficient of the intelligent ammeter at the power supply end can be obtained; based on the intelligent ammeter at the power supply end, the intelligent ammeter at the power utilization end and the measuring resistor, the error coefficient ratio of the intelligent ammeter at the power utilization end and the intelligent ammeter at the power supply end is obtained, and the existing metering equipment is only needed to be utilized in remote detection, so that the standard metering equipment is not needed to be additionally connected, the cost of remote monitoring is reduced, and the influence of errors generated by the standard metering equipment along with time and working environment on the monitoring precision is avoided; the staff only needs to detect one intelligent ammeter of the power supply end, and the error coefficient ratio obtained by matching with remote monitoring is calculated to obtain the error coefficient of each intelligent ammeter of the power utilization end corresponding to the power supply end, so that the workload of the staff is reduced, and meanwhile, the detection efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a normal power distribution network;
FIG. 2A is a schematic diagram of detecting a smart meter at a power consumer to be tested in a power distribution network when a measured resistor is in a first mode;
FIG. 2B is a schematic diagram of the detection of the smart meter at the electricity consumer to be tested in the power distribution network when the measurement resistor is in the second mode;
FIG. 2C is a schematic diagram of detecting a smart meter at a power consumer to be tested in a power distribution network when a measured resistor is in a third mode;
FIG. 3 is a flowchart of a method for eliminating accumulated errors of a smart meter according to the present invention;
fig. 4 is a flowchart of calculating the error coefficient ratio of the smart meter at the power consumption end to be measured and the smart meter at the power supply end.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a normal power distribution network. Fig. 2A-2C are schematic diagrams of the present invention for detecting a smart meter at a power consumer to be tested in a power distribution network. As shown in fig. 1, in a distribution network that works normally, a power supply terminal is provided with a power supply terminal smart meter M for measuring the output power of the power supply terminal, the power supply terminal supplies power to a plurality of power utilization terminals through the distribution network, each power utilization terminal is provided with a smart meter N for measuring the power consumption, and R W 、L W The RN1 and RN2 are line impedances in the distribution network, and the existing smart meters have realized remote data transmission and remote control. As shown in fig. 2A-2C, when detecting a power consumption terminal smart meter, other power consumption terminals in the power distribution network except the power consumption terminal where the power consumption terminal smart meter to be detected is located need to be disconnected from the power distribution network. Due to errors, the actual energy consumption value of the intelligent ammeter is different from the displayed metering value, and an error coefficient r is defined 1 For the ratio of the actual energy consumption value to the metering value measured by the intelligent ammeter at the power supply end, the error coefficient r 2 For the ratio of the actual energy consumption value to the metering value measured by the intelligent ammeter at the power consumption end, r is the time when the intelligent ammeter at the power supply end has no error 1 When the intelligent ammeter at the electricity utilization end has no error, r is =1 2 ＝1。
In this embodiment, as shown in fig. 3-4, the method for eliminating accumulated errors of a smart meter includes the following steps:
s1, according to a first detection period, control signals are sent to a power supply end intelligent ammeter M, a power utilization end intelligent ammeter N to be detected and a first switch of the power utilization end to be detected at regular intervals,
s2, based on the control signal, switching the measuring resistor R S Acquiring metering values of the power supply end intelligent ammeter M and the power consumption end intelligent ammeter N to be tested in different modes;
s3, calculating an error coefficient ratio epsilon of the intelligent electric meter N at the power consumption end to be detected and the intelligent electric meter M at the power supply end based on the metering values of the intelligent electric meter M at the power supply end and the intelligent electric meter N at the power consumption end to be detected in different modes;
s4, judging whether the error coefficient ratio epsilon is in a preset range, if so, executing a step S5, and if not, executing a step S6;
s5, judging whether the correction time from the last power supply end intelligent ammeter M exceeds a second detection period, if so, executing a step S6, and if not, enabling the power supply end intelligent ammeter M and the power consumption end intelligent ammeter N to be tested to be free from correction;
s6, the staff detects the intelligent ammeter M at the power supply end on site to obtain an error coefficient r of the intelligent ammeter M at the power supply end 1 ；
S7, error coefficient r based on intelligent ammeter M at power supply end 1 And calculating an error coefficient r of the intelligent ammeter N at the electricity end to be measured according to the error coefficient ratio epsilon 2 ；
S8, based on the error coefficient r 2 And calculating correction parameters, and sending and storing the correction parameters to the intelligent ammeter N at the user side to be tested.
Before the control signal is sent, only one electricity consumption terminal to be tested is reserved in the power distribution network, and the electricity consumption terminals except the electricity consumption terminal to be tested in the power distribution network are disconnected from the power distribution network. The second detection period is greater than the first detection period.
The intelligent electric meter M at the power supply end and the intelligent electric meter N at the power consumption end to be measured are respectively arranged at the input end and the output end of the same power distribution network, the intelligent electric meter M at the power supply end and the intelligent electric meter N at the power consumption end to be measured are arranged in a synchronous state, so that the intelligent electric meter M at the power supply end and the intelligent electric meter N at the power consumption end to be measured can synchronously start metering and synchronously end metering after receiving control signals. The control signals comprise a switch switching signal, a metering start signal and a metering end signal; one metering cycle is determined by a metering start signal and a metering end signal. The switch switching signal is used for switching the measuring resistor R S The switch switches the signalSending out a signal before metering start; after the first switch is switched, the power supply end intelligent ammeter M and the power consumption end intelligent ammeter N to be measured synchronously start metering after receiving the metering start signal; and the power supply end intelligent ammeter M and the power consumption end intelligent ammeter N to be measured synchronously stop metering according to the received metering ending signal.
The switch switching signal is sent to the intelligent ammeter N at the electricity consumption end to be detected, and the intelligent ammeter N at the electricity consumption end to be detected controls the first switch to finish measuring the resistance R S Is used for switching the access mode of the mobile terminal. Introducing a measuring resistor R at the position of the intelligent ammeter N at the electricity consumption end to be measured S To assist in realizing the measurement of the error coefficient ratio of the intelligent ammeter N at the power consumption end to be measured and the intelligent ammeter M at the power supply end, R S The resistor of 4.7KΩ can be selected, and the intelligent ammeter N at the electricity consumption end to be tested has the internal resistance R N Internal resistance R N The resistance value of (2) is far smaller than the measurement resistance R S 。
In one possible implementation, the switching measurement resistor R S The access mode of (1) includes:
s21, switching to a first mode, and placing a first switch at a first position S1, wherein a first end of the intelligent ammeter N at the electricity consumption end to be detected is connected with an output end of the power distribution network, and a second end of the intelligent ammeter N at the electricity consumption end to be detected and a load R at the electricity consumption end to be detected are connected with each other L Is connected with the first end of the measuring resistor R S Is connected with the first end of the intelligent ammeter N at the electricity consumption end to be measured, and measures the resistance R S Second end of (2) and load R of electricity end to be measured L As shown in fig. 2A. When the resistance R is measured S In the first mode, the power consumption of one metering cycle in the power distribution network satisfies:
r 1 -P M1 -P W1 ＝r 2 -P N1 +P S +P NL +P N0 (1)
wherein P is M1 For the corresponding power supply end intelligent ammeter measurement value P when the first switch is at the first position S1 W1 For the power loss of the network when the first switch is in the first position S1, P N1 For the corresponding electricity end intelligent ammeter that awaits measuring when first switch is in first position S1Magnitude, P S To measure resistance R S Corresponding power consumption, P NL For the load R of the electricity end to be measured L Internal loss, P, of intelligent ammeter at electricity consumption end to be detected N0 And the fixed loss of the intelligent ammeter at the electricity consumption end to be measured is achieved.
S22, switching to a second mode, and placing the first switch at a second position S2, wherein the first end of the intelligent ammeter N at the electricity consumption end to be detected is connected with the output end of the power distribution network, and the second end of the intelligent ammeter N at the electricity consumption end to be detected and the load R at the electricity consumption end to be detected L Is connected with the first end of the measuring resistor R S Is connected with the second end of the intelligent ammeter N at the electricity consumption end to be measured, and measures the resistance R S Second end of (2) and load R of electricity end to be measured L As shown in fig. 2B. When the resistance R is measured S In the second mode, the power consumption of one metering cycle in the power distribution network satisfies:
r 1 -P M2 -P W2 ＝r 2 -P N2 +P NS +P NL +P N0 (2)
wherein P is M2 For the corresponding power supply end intelligent ammeter measurement value P when the first switch is at the second position S2 W2 For the power loss of the network when the first switch is in the second position S2, P N2 For the corresponding electricity consumption end intelligent ammeter measurement value P to be measured when the first switch is at the second position S2 NS To measure resistance R S Internal loss, P, of intelligent ammeter at electricity consumption end to be detected NL For the load R of the electricity end to be measured L Internal loss, P, of intelligent ammeter at electricity consumption end to be detected N0 And the fixed loss of the intelligent ammeter at the electricity consumption end to be measured is achieved.
S23, switching to a third mode, and placing the first switch at a third position S3, wherein the first end of the intelligent ammeter N at the electricity consumption end to be detected is connected with the output end of the power distribution network, and the second end of the intelligent ammeter N at the electricity consumption end to be detected and the load R at the electricity consumption end to be detected are connected with the output end of the power distribution network L Is connected with the first end of the load R of the electricity end to be measured L Is grounded at the second end of the measuring resistor R S And the power end to be tested is not accessed, as shown in fig. 2C. When the resistance R is measured S In the third mode, a meter in the power distribution networkThe power consumption of the metering cycle satisfies:
r 1 -P M3 -P W3 ＝r 2 -P N3 +P NL +P N0 (3)
wherein P is M3 For the corresponding power supply end intelligent ammeter measurement value P when the first switch is at the third position S3 W3 For the power loss of the network when the first switch is in the third position S3, P N3 For the corresponding electricity consumption end intelligent ammeter measurement value P to be measured when the first switch is at the third position S3 NL For the load R of the electricity end to be measured L Internal loss, P, of intelligent ammeter at electricity consumption end to be detected N0 And the fixed loss of the intelligent ammeter at the electricity consumption end to be measured is achieved.
Measuring the energy consumption P of a resistor S Far less than the energy consumption P of the electricity end to be measured L So can be approximately regarded as the power grid energy consumption P W And the energy consumption P of the electricity consumption end to be measured L In a linear relationship, i.e
P W ＝a-P L +b (4)
Wherein a and b are constants; to obtain the measured resistance R S When in different access modes, the corresponding power grid energy consumption is as follows
The general formulas (1) - (3) and (5) are combined to obtain
And measuring resistance R S Internal loss P of intelligent ammeter at electricity consumption end to be detected NS Is that
Wherein U is the input voltage of the power consumption terminal to be tested. Because the internal resistance R of the intelligent ammeter N at the electricity consumption end to be detected N Far smaller than the measured resistance R S Electricity to be measuredEnd load R L Therefore, the resistance R is measured S Internal loss P of intelligent ammeter at electricity consumption end to be detected NS Far smaller than the measured resistance R S Corresponding power consumption P S Can be approximated as P M1 -P M3 ＝P S ，P N2 -P N3 ＝P S ，P N2 -P N1 ＝P S Obtaining the error coefficient ratio epsilon of the intelligent ammeter N at the power consumption end to be detected and the intelligent ammeter M at the power supply end as
In one possible implementation manner, the step of detecting the error coefficient ratio epsilon is repeated for a plurality of times, and an average value of the error coefficient ratios epsilon of the plurality of to-be-detected power consumption terminal intelligent electric meters N and the power supply terminal intelligent electric meters M is obtained.
In one possible implementation manner, the power supply terminal smart meter and the power consumption terminal smart meter to be tested are connected with the control center in a wireless communication manner, receive a control signal of the control center, and upload a measurement value obtained according to the control signal to the control center. The control center calculates error coefficient ratio epsilon based on the metering values of the intelligent ammeter at the power supply end and the intelligent ammeter at the power consumption end to be tested.
In one possible implementation manner, the controller of the smart meter at the user end to be tested controls the first switch to perform the switching action.
In one possible implementation, as shown in FIG. 1, the resistance R is measured S The first switch is arranged at the position of the intelligent ammeter at the power utilization end, and is in a normally closed state at the third position S3 when the intelligent ammeter at the user end works normally, so that the measuring resistor R is formed S And the power utilization terminal is not connected.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The method for eliminating the accumulated error of the intelligent ammeter is characterized by comprising the following steps:
s1, periodically sending control signals to a power supply terminal intelligent ammeter, a power consumption terminal intelligent ammeter to be tested and a first switch of the power consumption terminal to be tested according to a first detection period;
s2, based on the control signal, switching the measuring resistor R S Obtaining the metering values of the power supply end intelligent ammeter and the power consumption end intelligent ammeter to be tested in different modes;
the switching measuring resistor R S The access mode of (1) includes:
s21, switching to a first mode, and placing a first switch at a first position S1, wherein a first end of the intelligent ammeter at the electricity consumption end to be tested is connected with an output end of the power distribution network, and a second end of the intelligent ammeter at the electricity consumption end to be tested and a load R at the electricity consumption end to be tested are connected with each other L Is connected with the first end of the measuring resistor R S Is connected with the first end of the intelligent ammeter at the electricity end to be measured, and measures the resistance R S Second end of (2) and load R of electricity end to be measured L Is grounded;
s22, switching to a second mode, and placing the first switch at a second position S2, wherein the first end of the intelligent ammeter at the electricity consumption end to be tested is connected with the output end of the power distribution network, and the second end of the intelligent ammeter at the electricity consumption end to be tested and the load R at the electricity consumption end to be tested are connected with the power distribution network L Is connected with the first end of the measuring resistor R S The first end of the resistor R is connected with the second end of the intelligent ammeter at the electricity end to be measured S Second end of (2) and load R of electricity end to be measured L Is grounded;
s23, switching to a third mode, and placing the first switch at a third position S3, wherein the first end of the intelligent ammeter at the electricity consumption end to be tested is connected with the output end of the power distribution network, and the second end of the intelligent ammeter at the electricity consumption end to be tested and the load R at the electricity consumption end to be tested are connected with the power distribution network L Is connected with the first end of the load R of the electricity end to be measured L Is grounded at the second end of the measuring resistor R S The power utilization terminal to be tested is not accessed;
s3, calculating error coefficient ratio epsilon of the intelligent electric meter at the power consumption end to be tested and the intelligent electric meter at the power supply end based on the measured values of the intelligent electric meter at the power supply end and the intelligent electric meter at the power consumption end to be tested in different modes;
when the switching to the first mode is performed, the electric energy consumption of one metering period in the power distribution network meets the following conditions:
(1)
wherein P is M1 For the corresponding power supply end intelligent ammeter measurement value P when the first switch is at the first position S1 W1 For the power loss of the network when the first switch is in the first position S1, P N1 For the corresponding electricity consumption end intelligent ammeter measurement value P to be measured when the first switch is at the first position S1 S To measure resistance R S Corresponding power consumption, P NL For the load R of the electricity end to be measured L Internal loss, P, of intelligent ammeter at electricity consumption end to be detected N0 For the fixed loss of the intelligent ammeter at the power consumption end to be tested, the error coefficient r of the intelligent ammeter at the power supply end 1 Error coefficient r of intelligent ammeter at electricity consumption end to be detected 2 ；
When the switching to the second mode is performed, the electric energy consumption of one metering period in the power distribution network meets the following conditions:
(2)
wherein P is M2 For the corresponding power supply end intelligent ammeter measurement value P when the first switch is at the second position S2 W2 For the power loss of the network when the first switch is in the second position S2, P N2 For the corresponding electricity consumption end intelligent ammeter measurement value P to be measured when the first switch is at the second position S2 NS To measure resistance R S The internal loss of the intelligent ammeter at the electricity consumption end to be detected is caused;
when the switching to the third mode is performed, the electric energy consumption of one metering period in the power distribution network meets the following conditions:
(3)
wherein P is M3 For the corresponding power supply end intelligent ammeter measurement value P when the first switch is at the third position S3 W3 For the power loss of the network when the first switch is in the third position S3, P N3 The intelligent ammeter measurement value of the electricity end to be measured corresponding to the first switch in the third position S3;
measuring the energy consumption P of a resistor S Far less than the energy consumption P of the electricity end to be measured L So can be approximately regarded as the power grid energy consumption P W And the energy consumption P of the electricity consumption end to be measured L In a linear relationship:
(4)
wherein a and b are constants; to obtain the measured resistance R S When in different access modes, the corresponding power grid energy consumption is as follows:
（5）
the comprehensive working hours (1) - (3) and (5) are as follows:
（6）
measuring resistance R S Internal loss P of intelligent ammeter at electricity consumption end to be detected NS The method comprises the following steps:
（7）
wherein U is the input voltage of the electricity consumption end to be tested, and because of the internal resistance R of the intelligent ammeter N of the electricity consumption end to be tested N Far smaller than the measured resistance R S Load R of electricity end to be measured L Therefore, the resistance R is measured S Internal loss P of intelligent ammeter at electricity consumption end to be detected NS Far smaller than the measured resistance R S Corresponding power consumption P S Can be approximated as P M1 -P M3 =P S ，P N2 -P N3 =P S ，P N2 -P N1 =P S The error coefficient ratio epsilon of the intelligent electric meter N at the power consumption end to be detected and the intelligent electric meter M at the power supply end is obtained as follows:
（8）
s4, judging whether the error coefficient ratio epsilon is in a preset range, if so, executing a step S5, and if not, executing a step S6;
s5, judging whether the correction time from the last power supply end intelligent ammeter exceeds a second detection period, if so, executing a step S6, and if not, enabling the power supply end intelligent ammeter and the power consumption end intelligent ammeter to be tested to be free from correction;
s6, the staff detects the intelligent ammeter at the power supply end on site to obtain an error coefficient r of the intelligent ammeter at the power supply end 1 The method comprises the steps of carrying out a first treatment on the surface of the The error coefficient r 1 The ratio of the actual energy consumption value to the metering value measured by the intelligent ammeter at the power supply end;
s7, error coefficient r based on intelligent ammeter at power supply end 1 And calculating an error coefficient r of the intelligent ammeter at the electricity end to be measured according to the error coefficient ratio epsilon 2 The method comprises the steps of carrying out a first treatment on the surface of the The error coefficient r 2 The ratio of the actual energy consumption value to the metering value is measured by the intelligent ammeter at the electricity consumption end;
s8, based on the error coefficient r 2 And calculating correction parameters, and sending and storing the correction parameters to the intelligent ammeter at the user side to be tested.
2. The method for eliminating accumulated errors of smart meters according to claim 1, wherein only one power end to be measured is reserved in the power distribution network before the control signal is transmitted, and the power ends except the power end to be measured in the power distribution network are disconnected from the power distribution network.
3. The method of claim 2, wherein the control signals include a switch switching signal, a metering start signal, and a metering end signal; the switch switching signal is used for switching the measuring resistorR S And after receiving the metering start signal, the power supply end intelligent ammeter and the power consumption end intelligent ammeter to be measured synchronously start metering.
4. The method of claim 3, wherein the switch switching signal is sent earlier than a metering start signal; after the first switch is switched, the power supply end intelligent ammeter and the power consumption end intelligent ammeter to be tested synchronously start metering according to the received metering start signal; and the power supply end intelligent ammeter and the power consumption end intelligent ammeter to be measured synchronously stop metering according to the received metering ending signal.
5. The method for eliminating accumulated errors of smart meter according to claim 4, wherein the switch switching signal is sent to a smart meter at a power consumption end to be measured, and the smart meter at the power consumption end to be measured controls the first switch to complete the measurement of the resistance R S Switching of access modes.
6. The method for eliminating accumulated errors of smart meters according to claim 5, wherein the power supply side smart meter and the power consumption side smart meter to be tested are respectively connected with a control center in a wireless communication manner, and upload a measurement value obtained according to the control signal to the control center.
7. The method for eliminating accumulated errors of smart meter according to claim 6, wherein the first switch is in a normally closed state at the third position S3 when the smart meter at the user side is operating normally.
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