CN111983542A - Online detection system and method for measurement error of metering transformer - Google Patents
Online detection system and method for measurement error of metering transformer Download PDFInfo
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- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The application relates to a measuring mutual inductor measuring error on-line detection system and a method thereof, the system comprises a first measuring mutual inductor on-line detector and a second measuring mutual inductor on-line detector, the first metering mutual inductor on-line detector is respectively connected with a first voltage mutual inductor and a first current mutual inductor at the first end of the power transmission line, the second metering transformer on-line detector is respectively connected with a second voltage transformer and a second current transformer at the second end of the power transmission line, the first metering mutual inductor online detector and the second metering mutual inductor online detector are synchronous in clock, wherein, the online measuring and error detecting system for the metering mutual inductor measures and matches the voltage information and the current information of the first voltage mutual inductor, the first current mutual inductor, the second voltage mutual inductor and the second current mutual inductor online, and calculating the transformation ratio errors of the first voltage transformer and the first current transformer and the second voltage transformer and the second current transformer.
Description
Technical Field
The application relates to the field of electric power, in particular to a system and a method for online detection of measurement errors of a metering transformer.
Background
In the power industry, the accuracy of electric energy metering is an important index of electric energy operation. The electric energy metering device generally includes a voltage Transformer (PT), a Current Transformer (CT), and an electric energy meter. The accuracy of the voltage current transformer and the electric energy meter directly affects the accuracy of secondary metering, so that the PT error, the CT error and the electric energy meter error are generally required to be respectively detected when the field error detection is carried out on the electric energy metering device at present.
When the electric energy meter error is detected on site, the electric energy meter error can be detected on line in real time through the electric energy meter error site detector without power outage, and the method is very convenient. When the PT error and the CT error are detected on site, the PT error and the CT error can be detected through PT error and CT error detection equipment only after the power failure and the instrument boosting are necessary according to the existing detection method, and the problems of high cost, long time consumption, dangerous operation and the like exist.
Disclosure of Invention
Based on the above, the application provides a system and a method for online detection of measurement errors of a metering mutual inductor, which are used for online measurement of voltage and current values of the metering mutual inductor and calculation of a transformation ratio error of the metering mutual inductor under the condition of no power failure.
According to one aspect of the invention, an online measuring error detection system for a measuring transformer is provided, the system comprises a first online measuring transformer detector and a second online measuring transformer detector, the first online measuring transformer detector is respectively connected with a first voltage transformer and a first current transformer at a first end of a power transmission line, the second online measuring transformer detector is respectively connected with a second voltage transformer and a second current transformer at a second end of the power transmission line, the first online measuring transformer detector and the second online measuring transformer detector are in clock synchronization, wherein,
the online measuring error detection system of the metering transformer measures first voltage information, first current information, second voltage information and second current information of the first voltage transformer, the first current transformer, the second voltage transformer and the second current transformer on line;
temporally matching the measured first voltage information and first current information and the second voltage information and second current information to form matched voltage information and current information; and
and calculating the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the power transmission line according to the matched voltage information and current information, line parameters and a line model.
According to another aspect of the invention, an online detection method for measurement errors of a metering transformer is provided, and the method comprises the following steps:
the method comprises the steps of measuring first voltage information and first current information of a first voltage transformer and a first current transformer at a first end of a transmission line on line;
second voltage information and second current information of a second voltage transformer and a second current transformer at the second end of the power transmission line are measured on line;
temporally matching the measured first voltage information and first current information and the measured second voltage information and second current information to form matched voltage information and current information; and
and calculating the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the power transmission line according to the matched voltage information and current information, line parameters and a line model.
According to the system and the method for detecting the measurement error of the metering mutual inductor, the voltage and the current values of the metering mutual inductor can be measured on line under the condition of no power failure, and the transformation ratio error of the metering mutual inductor is calculated. The measuring transformer measuring error online detection scheme provided by the application is simple to implement and low in cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without exceeding the protection scope of the present application.
Fig. 1 is a schematic structural diagram of an online detection system for measurement errors of a metering transformer according to a first embodiment of the invention.
Fig. 2 is a schematic structural diagram of an on-line measuring error detection system for a metering transformer according to a second embodiment of the invention.
Fig. 3 is a schematic structural diagram of an online detection system for measurement error of a metering transformer according to a third embodiment of the invention.
Fig. 4 is a schematic structural diagram of an online detection system for measurement error of a metering transformer according to a fourth embodiment of the invention.
Fig. 5 is a schematic structural diagram of a high-voltage transmission line model according to an embodiment of the invention.
Fig. 6 is a flow chart for calculating the transformation ratio error of the voltage and current transformers across the high voltage transmission line using the levenberg-marquardt algorithm in accordance with an embodiment of 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 some, but not all, embodiments of the present application. 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.
According to one aspect of the invention, an online detection system for measurement errors of a metering transformer is provided. Fig. 1 is a schematic structural diagram of an online detection system for measurement errors of a metering transformer according to a first embodiment of the invention. As shown in fig. 1, the online measuring error detecting system for the measuring mutual inductor comprises a first online measuring mutual inductor detector and a second online measuring mutual inductor detector, wherein the first online measuring mutual inductor detector is respectively connected with a first voltage mutual inductor and a first current mutual inductor at a first end of a power transmission line, the second online measuring mutual inductor detector is respectively connected with a second voltage mutual inductor and a second current mutual inductor at a second end of the power transmission line, and the first online measuring mutual inductor detector and the second online measuring mutual inductor detector are synchronous in clock.
Wherein the transmission line may be a high voltage transmission line. In fig. 1, a first voltage transformer and a first current transformer are located in a first substation, and a second voltage transformer and a second current transformer are located in a second substation, however, it should be noted that the first voltage transformer, the first current transformer, the second voltage transformer and the second current transformer may also be located in other lines besides the high-voltage transmission line, and the present application is not limited herein.
The online measuring system for the measuring errors of the metering mutual inductor measures first voltage information, first current information, second voltage information and second current information of the first voltage mutual inductor, the first current mutual inductor, the second voltage mutual inductor and the second current mutual inductor on line; temporally matching the measured first voltage information and first current information and the second voltage information and second current information to form matched voltage information and current information; and, the online measuring error detecting system of the metering transformer calculates the transformation ratio error of the first voltage transformer and the first current transformer and the transformation ratio error of the second voltage transformer and the second current transformer at two ends of the high-voltage transmission line according to the matched voltage information and current information, line parameters and line model, and the calculating process will be described in detail below.
Fig. 2 is a schematic structural diagram of an on-line measuring error detecting system for a metering transformer according to a second embodiment of the invention. According to the embodiment of fig. 2, the online detection system for measuring errors of the metering transformer shown in fig. 1 comprises a first online detector for the metering transformer and a second online detector for the metering transformer. The first voltage transformer and the first current transformer are respectively connected with the first metering transformer online detector, the second voltage transformer and the second current transformer are respectively connected with the second metering transformer online detector, and the first metering transformer online detector and the second metering transformer online detector are synchronous in clock.
According to the embodiment of fig. 2, the first online measuring transformer detector measures first voltage information and first current information of the first voltage transformer and the first current transformer online, and the second online measuring transformer detector measures second voltage information and second current information of the second voltage transformer and the second current transformer online; the second metering mutual inductor online detector receives first voltage information and first current information which are measured online by the first metering mutual inductor online detector, matches the received first voltage information and first current information with the measured second voltage information and second current information in time to form matched voltage information and current information, and calculates the transformation ratio errors of the first voltage mutual inductor and the first current mutual inductor and the transformation ratio errors of the second voltage mutual inductor and the second current mutual inductor at two ends of the high-voltage transmission line according to the matched voltage information and current information, line parameters and a line model.
Fig. 3 is a schematic structural diagram of an online detection system for measurement error of a metering transformer according to a third embodiment of the invention. According to the embodiment of fig. 3, the online detection system for measuring errors of the metering transformer shown in fig. 1 comprises a first online detector for the metering transformer and a second online detector for the metering transformer. The first voltage transformer and the first current transformer are respectively connected with the first metering transformer online detector, the second voltage transformer and the second current transformer are respectively connected with the second metering transformer online detector, and the first metering transformer online detector and the second metering transformer online detector are synchronous in clock.
According to the embodiment of fig. 3, the system for online detection of measurement errors of a metering transformer further comprises a computing device, the first online detector of the metering transformer measures first voltage information and first current information of the first voltage transformer and the first current transformer online and transmits the measured first voltage information and first current information to the computing device, and the online detector of the second metering transformer measures second voltage information and second current information of the second voltage transformer and the second current transformer online and transmits the measured second voltage information and second current information to the computing device; the calculating device matches the received first voltage information, first current information, second voltage information and second current information in time to form matched voltage information and current information, and calculates the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the high-voltage transmission line according to the matched voltage information, current information, line parameters and line models.
Fig. 4 is a schematic structural diagram of an online detection system for measurement error of a metering transformer according to a fourth embodiment of the present invention. According to the embodiment of fig. 4, the online detection system for measuring errors of the metering transformer shown in fig. 1 comprises a first online detector for the metering transformer and a second online detector for the metering transformer. The first voltage transformer and the first current transformer are respectively connected with the first metering transformer online detector, the second voltage transformer and the second current transformer are respectively connected with the second metering transformer online detector, and the first metering transformer online detector and the second metering transformer online detector are synchronous in clock.
According to the embodiment of fig. 4, the online measurement error detection system of the metering transformer further comprises a computing device, the online measurement detector of the first metering transformer measures first voltage information and first current information of the first voltage transformer and the first current transformer online and transmits the measured first voltage information and first current information to the online measurement detector of the second metering transformer, the online measurement detector of the second metering transformer measures second voltage information and second current information of the second voltage transformer and the second current transformer online and transmits the received first voltage information and first current information and the measured second voltage information and second current information to the computing device; the computing device temporally matching the received first voltage information and first current information and the measured second voltage information and second current information to form matched voltage information and current information; and the calculating device calculates the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the high-voltage transmission line according to the matched voltage information and current information, line parameters and a line model.
In the exemplary embodiment shown in fig. 4, the step of temporally matching the first voltage information, the first current information, the second voltage information and the second current information may be performed not in the computing device, but in a second instrument transformer online detector. Thus, according to an alternative embodiment, the first meter-transformer online detector measures first voltage information and first current information of the first voltage transformer and the first current transformer online and transmits the measured first voltage information and first current information to the second meter-transformer online detector, and the second meter-transformer online detector measures second voltage information and second current information of the second voltage transformer and the second current transformer online and matches the received first voltage information and first current information and the measured second voltage information and second current information in time to form matched voltage information and current information; and the calculating device calculates the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the high-voltage transmission line according to the matched voltage information and current information, line parameters and a line model.
In the embodiments shown in fig. 2 to 4, the clock synchronization of the first metering transformer and the second metering transformer on-line detector includes performing clock synchronization by using a GNSS (Global Navigation Satellite System) clock source and/or a local clock source, where the GNSS clock source includes a GPS (Global Positioning System) clock source, a GLONASS (GLONASS) clock source, a beidou clock source, a galileo clock source, and the like. In the embodiments shown in fig. 2 to 4, the voltage information and the current information measured by the first or second metering transformer online detector are transmitted to the second or first metering transformer online detector or the computing device in a wired, wireless or copy manner, where the wired manner includes at least one of a bluetooth transmission manner, a 2G transmission manner, a 3G transmission manner, a 4G transmission manner, a 5G transmission manner and a WIFI transmission manner, and the wireless manner includes at least one of a private network transmission manner and a fixed network transmission manner. In the embodiments shown in fig. 2 to 4, the instrument transformer on-line detector may be any one of a portable instrument transformer on-line detector and a mounted instrument transformer on-line detector, wherein the voltage transformer, the current transformer and the instrument transformer on-line detector are connected in a manner that voltage lines are clamped between two ends of a secondary side of the voltage transformer by crocodiles, and a current clamp is clamped on an outgoing line of the secondary side of the current transformer. In the embodiments shown in fig. 3 and 4, the computing device may be a cloud server or a PC management platform.
According to another aspect of the invention, an online detection method for measuring errors of a metering transformer is provided. The method is based on a measurement error online detection system of a metering mutual inductor, the system comprises a first metering mutual inductor online detector and a second metering mutual inductor online detector, the first metering mutual inductor online detector is respectively connected with a first voltage mutual inductor and a first current mutual inductor at a first end of a power transmission line, the second metering mutual inductor online detector is respectively connected with a second voltage mutual inductor and a second current mutual inductor at a second end of the power transmission line, and the first metering mutual inductor online detector and the second metering mutual inductor online detector are synchronous in clock. The online detection method for the measurement error of the metering transformer comprises the following steps:
firstly, measuring first voltage information and first current information of the first voltage transformer and the first current transformer on line, and measuring second voltage information and second current information of the second voltage transformer and the second current transformer on line by using a second measuring transformer on-line detector;
step two, matching the measured first voltage information and the first current information and the measured second voltage information and the second current information in time to form matched voltage information and current information; and
and thirdly, calculating the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the high-voltage transmission line according to the matched voltage information, current information, line parameters and line models.
Wherein, the third step comprises the following substeps:
and a first substep of obtaining a relationship between a line parameter, the matched voltage information and current information, and a transformation ratio error of the first voltage transformer and the first current transformer and a transformation ratio error of the second voltage transformer and the second current transformer at two ends of the high-voltage transmission line based on a line model and a relationship between the matched voltage information and current information and the real voltage information and real current information.
The transformation ratio error comprises the ratio difference of a voltage/current transformer and the angular difference of the voltage/current transformer, and the model on which the transformation ratio error is calculated by the method is shown in FIG. 5. Fig. 5 is a schematic structural diagram of a high-voltage transmission line model according to an embodiment of the invention. As shown in FIG. 5, the voltage and current at the first end of the high voltage transmission line are
And
the voltage and current at the second end of the high-voltage transmission line are
And
the line parameters of the line model include impedance and susceptance, and the line conductance is ignored. In the circuit model shown in fig. 5, the impedance between the two ends of the high-voltage transmission line is Z ═ R + Xi, where R denotes the line resistance and X denotes the reactance. And susceptance of the first end and the second end of the high-voltage transmission line is B.
In the model shown in FIG. 5, the formula (1.1) is obtained according to kirchhoff's law
Wherein the content of the first and second substances,
which represents the phasor of the first terminal voltage,
representing the phasor of the current at the first terminal,
representing the phasor of the voltage at the second terminal,
representing the second terminal current phasor.
It should be noted that fig. 5 only shows the structure of a transmission line model, and the relationship between the line parameters and the measured voltage information and current information is established according to the model. It will be appreciated by those skilled in the art that if a transmission line model other than that shown in fig. 5 is used, the relationship between the line parameters and the measured voltage and current information may be established based on the different line model, and the subsequent transformation ratio error calculation may be performed based on the established relationship, which falls within the scope covered by the present application.
The actual measured value and the actual value have a relationship of a ratio difference and an angular difference, as shown in the following formula
Wherein, KvRepresenting the amplitude ratio difference, K, of the voltage transformeriRepresenting the amplitude ratio difference, theta, of the current transformervRepresenting the angular difference, theta, of the voltage transformeriThe angular difference of the current transformer is represented,
represents the phasor of the voltage measured by the detector,
which represents the true phasor of the voltage,
represents the current phasor measured by the detector,
representing the true current phasor.
The calculation formulas of the line parameters Z and B are derived from (1.1), and the true values are expressed by the measured values and the errors, to obtain formula (1.3)
Wherein the content of the first and second substances,
representing the true value of the first terminal voltage component,
the true value of the current phasor at the first terminal is shown,
representing the true value of the second terminal voltage component,
representing the true value of the second-terminal current phasor, VpRepresenting a first terminal voltage phasor measurement, IpRepresenting a first terminal current phasor measurement, VqRepresenting second terminal voltage phasor measurement value, IqRepresenting a second terminal current phasor measurement, KvqRepresenting the amplitude ratio difference, K, of the first terminal voltage transformervqRepresenting the amplitude ratio difference, K, of the second terminal voltage transformeripRepresenting the amplitude ratio difference, K, of the first-end current transformeriqRepresenting the amplitude ratio difference, Delta theta, of the current transformer at the second endvpRepresenting the angular difference, Δ θ, of the first terminal voltage transformervqRepresenting the angular difference, Δ θ, of the voltage transformer at the second terminalipRepresenting the angular difference, Delta theta, of the current transformer at the first endiqRepresenting the second terminal current transformer angular difference.
Wherein (K)vp，Kvq，Kip，Kiq，Δθvp，Δθvq，Δθip，Δθiq) Representing the transformation ratio error of the first voltage transformer and the first current transformer and the transformation ratio error of the second voltage transformer and the second current transformer, R, X, B may be considered to be about (K)vp，Kvq，Kip，Kiq，Δθvp，Δθvq，Δθip，Δθiq) When the transformer has no error, i.e. Kvp＝Kvq＝Kip＝Kiq＝1，Δθvp＝Δθvq＝Δθip＝ΔθiqWhen 0, R, X, B calculated according to equation (1.3) corresponds to the line parameters provided in the system. When the mutual inductor has errors, the calculated result is deviated from the actual line parameters.
And a second substep of making the ratio error of the first voltage transformer and the first current transformer and the ratio error of the second voltage transformer and the second current transformer at two ends of the high-voltage transmission line corresponding to the minimum error between the measured line parameter and the real line parameter be the required ratio error.
After the voltage information and the current information are measured on line and the measured voltage information and the measured current information are matched in time, in a specific embodiment, a levenberg-marquardt algorithm is adopted based on a line model to calculate the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the high-voltage transmission line, and the specific calculation process is as follows.
Generally, at least 3 pairs of well-matched voltage information and current information under different loads are needed to estimate the transformer transformation ratio error by adopting the Levenberg-Marquardt algorithm.
Fig. 6 is a flow chart for calculating the transformation ratio error of the voltage transformer and the current transformer at two ends of the high-voltage transmission line by using the levenberg-marquardt algorithm according to the embodiment of the present invention, wherein the symbols in fig. 6 respectively have the following meanings:
number of k iterations
kmaxMaximum number of iterations
x0Initial value
Mu damping factor
J Jacobian matrix
Ahesian matrix
1Limit value of degree of target deviation
2Limit of target deviation
3Limits of iterative stepping
vkRegulating factor
| | | denotes L2Norm, i.e. Euclidean norm
|| ||2Represents the square L2Norm of
|| ||∞Represents the maximum norm
In the embodiment shown in fig. 6, the levenberg-marquardt algorithm pair is usedAnd (3) performing iterative approximation on the specific difference and the angular difference of the voltage and current transformer to minimize the deviation of the calculation result and the actual line parameter, wherein the deviation approaches to 0. Let x be [ K ═ Kvp Kvq KipKiq Δθvp Δθvq Δθip Δθiq]T，y＝[Rtrue Xtrue Btrue]T，f(x)＝[Rmeas Xmeas Bmeas]TMinimizing | | y-f (x) | non-woven phosphor2. The calculation steps are as follows:
first, a jacobian matrix J of equation (1.3) is calculated:
setting a maximum number of iterations kmax＝100；1＝2＝3＝10-10；μ＝10-3*maxi＝1，...，m(Aii)；vk2. In addition, k shown in FIG. 6max、1、2、3Mu and vkThe value of (b) is just an example, and the set value is adjustable according to actual needs.
Initializing k to be 0; x ═ x0＝[1，1，1，1，0，0，0，0]T
Calculating A ═ JTJ；
Judging | | g | non-conducting phosphor∞≤1If yes, the process is ended, and x at this timekThe values of (1) are the specific difference and angular difference values of the voltage current transformer;
otherwise, judging
If yes, ending the process, and x at the momentkThe values of (1) are the specific difference and angular difference values of the voltage current transformer;
otherwise, judging that k is more than or equal to kmaxIf yes, the process is ended, at this timeX ofkThe values of (1) are the specific difference and angular difference values of the voltage current transformer;
otherwise calculate
Then, judge
If yes, ending the process, and x at the momentkThe values of (1) are the specific difference and angular difference values of the voltage current transformer;
otherwise
Then judging whether rho is greater than 0, if so, xk+1＝xnew，μk+1＝μk*max(1/3，1-(2ρ-1)3)；vk2; k is k + 1; then calculate A ═ JTJ，
Else muk+1＝μk*vk；vk+1＝2*vk；
Finally obtained xkNamely the specific difference and the angular difference of the voltage current transformer.
According to the system and the method for detecting the measurement error of the metering mutual inductor, the voltage and the current values of the metering mutual inductor can be measured on line under the condition of no power failure, and the transformation ratio error of the metering mutual inductor is calculated. The measuring transformer measuring error online detection scheme provided by the application is simple to implement and low in cost.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the description of the embodiments is only intended to facilitate the understanding of the methods and their core concepts of the present application. Meanwhile, a person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the scope of the present application. In view of the above, the description should not be taken as limiting the application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (12)
1. A measurement error online detection system of a metering mutual inductor comprises a first measurement mutual inductor online detector and a second measurement mutual inductor online detector, wherein the first measurement mutual inductor online detector is respectively connected with a first voltage mutual inductor and a first current mutual inductor at a first end of a power transmission line, the second measurement mutual inductor online detector is respectively connected with a second voltage mutual inductor and a second current mutual inductor at a second end of the power transmission line, the first measurement mutual inductor online detector and the second measurement mutual inductor online detector are synchronous in clock, wherein,
the online measuring error detection system of the metering transformer measures first voltage information, first current information, second voltage information and second current information of the first voltage transformer, the first current transformer, the second voltage transformer and the second current transformer on line;
temporally matching the measured first voltage information and first current information and the second voltage information and second current information to form matched voltage information and current information; and
and calculating the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the power transmission line according to the matched voltage information and current information, line parameters and a line model.
2. The system of claim 1, wherein the first meter transformer online detector measures first voltage information and first current information of the first voltage transformer and the first current transformer online, and the second meter transformer online detector measures second voltage information and second current information of the second voltage transformer and the second current transformer online; the second metering mutual inductor online detector receives first voltage information and first current information which are measured online by the first metering mutual inductor online detector, matches the received first voltage information and first current information with the measured second voltage information and second current information in time to form matched voltage information and current information, and calculates the transformation ratio errors of the first voltage mutual inductor and the first current mutual inductor and the transformation ratio errors of the second voltage mutual inductor and the second current mutual inductor at two ends of the power transmission line according to the matched voltage information and current information, line parameters and a line model.
3. The system of claim 1, further comprising a computing device, the first meter-transformer online detector measuring first voltage information and first current information of the first voltage transformer and the first current transformer online and transmitting the measured first voltage information and first current information to the computing device, the second meter-transformer online detector measuring second voltage information and second current information of the second voltage transformer and the second current transformer online and transmitting the measured second voltage information and second current information to the computing device; the calculating device matches the received first voltage information, first current information, second voltage information and second current information in time to form matched voltage information and current information, and calculates the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the power transmission line according to the matched voltage information, current information, line parameters and a line model.
4. The system of claim 1, further comprising a computing device, the first meter transformer online detector measuring first voltage information and first current information of the first voltage transformer and the first current transformer online and transmitting the measured first voltage information and first current information to the second meter transformer online detector, the second meter transformer online detector measuring second voltage information and second current information of the second voltage transformer and the second current transformer online and matching the received first voltage information and first current information and the measured second voltage information and second current information over time to form matched voltage information and current information; and the calculating device calculates the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the power transmission line according to the matched voltage information and current information, line parameters and a line model.
5. The system of claim 1, further comprising a computing device, the first meter transformer online detector measuring first voltage information and first current information of the first voltage transformer and the first current transformer online and transmitting the measured first voltage information and first current information to the second meter transformer online detector, the second meter transformer online detector measuring second voltage information and second current information of the second voltage transformer and the second current transformer online and transmitting the received first voltage information and first current information and the measured second voltage information and second current information to the computing device; the computing device temporally matching the received first voltage information and first current information and the measured second voltage information and second current information to form matched voltage information and current information; and the calculating device calculates the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the power transmission line according to the matched voltage information and current information, line parameters and a line model.
6. The system of any of claims 1-5, wherein the calculating the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer across the power transmission line comprises calculating the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer across the power transmission line using a Levenberg-Marquardt algorithm.
7. The system of claim 1, wherein the first and second gauge transformer online instrumentation clock synchronization comprises clock synchronization with a GNSS clock source and/or a local clock source.
8. The system of any one of claims 1-5, wherein the line model comprises a high voltage transmission line model.
9. The system of any one of claims 1-5, wherein the line parameters include resistance, reactance, and susceptance.
10. A method for online detection of measurement errors of a metering transformer, the method comprising:
the method comprises the steps of measuring first voltage information and first current information of a first voltage transformer and a first current transformer at a first end of a transmission line on line;
second voltage information and second current information of a second voltage transformer and a second current transformer at the second end of the power transmission line are measured on line;
temporally matching the measured first voltage information and first current information and the measured second voltage information and second current information to form matched voltage information and current information; and
and calculating the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer at two ends of the power transmission line according to the matched voltage information and current information, line parameters and a line model.
11. The method of claim 10 wherein said calculating the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer across the power transmission line comprises calculating the transformation ratio errors of the first voltage transformer and the first current transformer and the transformation ratio errors of the second voltage transformer and the second current transformer across the power transmission line using a levenberg-marquardt algorithm.
12. The method of claim 10 or 11, wherein said calculating a ratio error of said first voltage transformer and said first current transformer and a ratio error of said second voltage transformer and said second current transformer across said power transmission line from said matched voltage information and current information, line parameters and line models comprises:
obtaining a relationship between the line parameters and the matched voltage and current information and a transformation ratio error of the first voltage transformer and the first current transformer and a transformation ratio error of the second voltage transformer and the second current transformer at two ends of the power transmission line based on the line model and the relationship between the matched voltage and current information and the real voltage and current information;
and when the error between the measured line parameter and the real line parameter is minimized, the ratio error of the first voltage transformer and the first current transformer and the ratio error of the second voltage transformer and the second current transformer corresponding to the two ends of the transmission line are required ratio errors.
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