CN109298376B - Electric energy value transmission method and system based on standard electric energy meter group - Google Patents
Electric energy value transmission method and system based on standard electric energy meter group Download PDFInfo
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- CN109298376B CN109298376B CN201811289298.7A CN201811289298A CN109298376B CN 109298376 B CN109298376 B CN 109298376B CN 201811289298 A CN201811289298 A CN 201811289298A CN 109298376 B CN109298376 B CN 109298376B
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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
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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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 and a system for transmitting electric energy values based on a standard electric energy meter group, and belongs to the field of electric energy metering. Building a standard electric energy meter group, and selecting the standard electric energy meter with the minimum uncertainty as a reference electric energy meter r; obtaining an error value of each standard electric energy meter and the meter to be tested; predicting a predicted value of a difference value of the ith standard meter relative to the standard electric energy meter set at the (t + tau) moment; determining the weight ω of each criteria table i (ii) a Calculating an error value between the reference meter r at the (t + tau) moment and the standard electric energy meter group; according to weight ω i Determining an error value of the meter to be measured relative to the standard electric energy meter group; and determining the calculated value of the difference value of each standard meter relative to the standard electric energy meter group at the moment (t + tau). According to the standard electric energy meter set established by the invention, the accuracy of the standard electric energy meter set is better than one ten thousandth, the measured electric energy of the standard electric energy meter set is compared with the meter to be measured, the quantity value transmission to the meter to be measured is realized, an easily-realized quantity value transmission method is provided for laboratory detection personnel, and the accuracy of a standard measuring device can be improved to five hundred thousandth.
Description
Technical Field
The invention relates to the field of electric energy metering, in particular to a method and a system for transferring electric energy values based on a standard electric energy meter group.
Background
With the development of the electric energy metering technology, the accuracy of the gateway electric energy meter reaches one thousandth, the accuracy of the provincial electric energy meter generally reaches two ten thousandth, and some electric energy meters reach one thousandth, the highest electric energy metering standard of the current company can only reach one thousandth, the quantity value transmission requirement of the electric energy metering standard cannot be met, the performance of a single electric energy meter reaches the limit under the prior art condition, and the accuracy of electric energy metering is difficult to improve from the hardware perspective.
Disclosure of Invention
In view of the above problems, the present invention provides a method for transferring an electric energy value based on a standard electric energy meter group, the method comprising:
building a standard electric energy meter group, acquiring the uncertainty of the standard electric energy meter, and selecting the standard electric energy meter with the minimum uncertainty as a reference electric energy meter r;
the method comprises the steps that a to-be-tested meter is connected into a standard electric energy meter group, and after the standard electric energy meter group works, the error value of each standard electric energy meter and the to-be-tested meter is obtained;
acquiring a difference value and a metering error value of the ith standard meter relative to the standard electric energy meter group at the moment t, and predicting a predicted value of the difference value of the ith standard meter relative to the standard electric energy meter group at the moment (t + tau);
determining the weight omega of each standard meter according to the predicted value of the difference value between the ith standard meter and the standard electric energy meter group at the time t and the calculated value of the difference value between the standard meter and the standard electric energy meter group at the time t i ；
According to the predicted value of the difference value between the ith standard meter and the standard electric energy meter group at the (t + tau) moment, expressing the predicted value of the error value between the reference meter r and the standard electric energy meter according to the weight omega i Calculating an error value between the reference meter r at the (t + tau) moment and the standard electric energy meter group;
determining the error value of the meter to be measured at the (t + tau) moment relative to the standard electric energy meter group according to the difference value between the meter to be measured at the (t + tau) moment and the reference meter r;
and determining a calculated value of the difference value of each standard meter relative to the standard electric energy meter group at the (t + tau) moment according to the error value of each standard electric energy meter and the meter to be measured at the (t + tau) moment and the error value of the reference meter r and the standard electric energy meter group at the (t + tau) moment.
Optionally, the standard electric energy meter group includes: the communication interface is used for transmitting data and instructions, receiving and transmitting test data and controlling the working state of the standard electric energy meter.
Optionally, the standard electric energy meter is a standard electric energy meter with accuracy of one ten thousandth and below.
Optionally, in the set of standard electric energy meters, the accuracy of a single standard electric energy meter is one ten thousandth, when the accuracy of the meter to be measured is lower than one ten thousandth, the working state of the standard electric energy meter is controlled through the communication interface, and only one standard electric energy meter is connected for calibration; and when the accuracy of the meter to be measured is one ten-thousandth, all the standard electric energy meters in the standard electric energy meter group work to finish the calibration work.
Optionally, the error value is an electric energy error value of the standard meter and the meter to be measured.
The invention also relates to a system for transferring the electric energy value based on the standard electric energy meter group, which comprises:
determining a reference meter module, constructing a standard electric energy meter group, calibrating the standard electric energy meters in the standard electric energy meter group, acquiring the uncertainty of the standard electric energy meters, and selecting the standard electric energy meter with the minimum uncertainty as a reference meter r;
the parameter acquisition module is used for accessing the meters to be tested into the standard electric energy meter group, and acquiring the error value of each standard electric energy meter and the meter to be tested after the standard electric energy meter group works;
the predicted value obtaining module is used for obtaining the difference value and the metering error value of the ith standard meter relative to the standard electric energy meter group at the moment t and predicting the predicted value of the difference value of the ith standard meter relative to the standard electric energy meter group at the moment (t + tau);
the weight obtaining module is used for determining the weight omega of each standard meter according to the predicted value of the difference value between the ith standard meter and the standard electric energy meter group at the moment t and the calculated value of the difference value between the standard meter and the standard electric energy meter group at the moment t i ；
The first calculation module represents a predicted value of an error value of the reference meter r and the standard electric energy meter according to a predicted value of a difference value between the ith standard meter and the standard electric energy meter group at the (t + tau) moment and according to the weight omega i Calculating an error value between the reference meter r at the (t + tau) moment and the standard electric energy meter group;
the second calculation module is used for determining the error value of the meter to be measured at the (t + tau) moment relative to the standard electric energy meter group according to the difference value of the meter to be measured at the (t + tau) moment and the reference meter r;
and the electric energy value calculation module is used for determining a calculated value of a difference value of each standard meter relative to the standard electric energy meter group at the (t + tau) moment according to the error value of each standard electric energy meter and the meter to be measured at the (t + tau) moment and the error value of the reference meter r and the standard electric energy meter group at the (t + tau) moment.
The method can be applied to calibration of standard electric energy meters with the accuracy level of ten-thousandth, the accuracy of the standard electric energy meter set is better than one-thousandth through the standard electric energy meter set established by the method, the measured electric energy of the standard electric energy meter set is compared with the electric energy to be measured, the quantity value transmission to the electric energy to be measured is realized, an easily-realized quantity value transmission method is provided for laboratory detection personnel, and the accuracy of a measuring standard device can be improved to five hundred thousandth on the premise that hardware is not updated.
Drawings
FIG. 1 is a flow chart of a method for transferring an electric energy value based on a standard electric energy meter group according to the present invention;
fig. 2 is a system diagram of the electric energy value transmission based on the standard electric energy meter group according to the present invention.
Detailed Description
Example embodiments of the present invention will now be described with reference to the accompanying drawings, however, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are provided for a complete and complete disclosure of the invention and to fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for transmitting electric energy value based on a standard electric energy meter group, as shown in figure 1, comprising the following steps:
building a standard electric energy meter group, calibrating the standard electric energy meters in the standard electric energy meter group, acquiring the uncertainty of the standard electric energy meters, and selecting the standard electric energy meter with the minimum uncertainty as a reference electric energy meter r; the standard electric energy meter group comprises: the communication interface is used for transmitting data and instructions, receiving and transmitting test data and controlling the working state of the standard electric energy meter. The standard electric energy meter is one ten thousandth of accuracy and below. When the accuracy of the meter to be tested is lower than one ten thousandth, the working state of the standard electric energy meter is controlled through the communication interface, and only one standard electric energy meter is connected for calibration; and when the accuracy of the meter to be measured is one ten-thousandth, all the standard electric energy meters in the standard electric energy meter group work to finish the calibration work.
The method comprises the steps that a to-be-measured meter is connected to a standard electric energy meter group, and after the standard electric energy meter group works, the error value between each standard electric energy meter and the to-be-measured meter is obtained; the error value is the electric energy error value of the standard meter and the meter to be measured.
Obtaining the difference value x of the ith standard meter relative to the standard electric energy meter group at the moment t i (t) and a value of the metering error y i (t) according to x i (t) and y i (t) predicting the predicted value of the difference value of the ith standard meter relative to the standard electric energy meter set at the (t + tau) moment
τ is the time interval of two time instants;
according to the predicted value of the difference value between the ith standard meter and the standard electric energy meter set at the moment t
And x i Calculating the difference value x (t) between the meter and the standard electric energy meter set at the time (t + tau) t, and determining the weight omega of each standard meter i ；
According to the difference value between the meter to be measured at the (t + tau) moment and the reference meter r, determining the error value x of the meter to be measured at the (t + tau) moment relative to the standard electric energy meter set o (t+τ)＝x r (t+τ)+t ro (t+τ)，t ro (t + tau) is the difference value between the table to be measured and the reference table r at the moment (t + tau); weight ω of each criteria table i Specifically, the following rules are adopted for configuration:
each standard electric energy meter has an expected error relative to the predicted value and the calculated value of the meter group:
in the expected error
Is the total measurement deviation of the table set, which is
According to the predicted value of the difference value of the ith standard meter and the standard electric energy meter group at the (t + tau) moment
The predicted value representing the error value between the reference meter r and the standard electric energy meter
t ri (t + τ) is the actual difference between the error value measured by the ith meter and the error value measured by the reference meter r at the time of (t + τ), according to the weight ω i Calculating the error value between the reference meter r and the standard electric energy meter set at the (t + tau) moment
Determining a calculated value x of the difference value of each standard meter relative to the standard electric energy meter group at the (t + tau) moment according to the error value of each standard electric energy meter and the to-be-measured meter at the (t + tau) moment and the error value of the reference meter r and the standard electric energy meter group at the (t + tau) moment i (t+τ)。
The present invention further provides a system 200 for transferring electric energy based on standard electric energy meter set, as shown in fig. 2, the system 200 includes:
determining a reference meter module 201, building a standard electric energy meter group, acquiring the uncertainty of the standard electric energy meter, and selecting the standard electric energy meter with the minimum uncertainty as a reference meter r;
the parameter obtaining module 202 is used for accessing the meters to be tested into the standard electric energy meter group, and obtaining the error value of each standard electric energy meter and the meter to be tested after the standard electric energy meter group works;
the predicted value obtaining module 203 is used for obtaining a difference value and a metering error value of the ith standard meter relative to the standard electric energy meter group at the moment t, and predicting a predicted value of the difference value of the ith standard meter relative to the standard electric energy meter group at the moment (t + tau);
the weight obtaining module 204 determines the weight omega of each standard meter according to the predicted value of the difference value between the ith standard meter and the standard electric energy meter group at the time t and the calculated value of the difference value between the reference meter r and the standard electric energy meter group at the time t i ；
The first calculation module 205 represents a predicted value of an error value between the reference meter r and the standard electric energy meter according to a predicted value of a difference between the ith standard meter and the standard electric energy meter set at the time (t + τ), and according to the weight ω i Calculating an error value between the reference meter r at the (t + tau) moment and the standard electric energy meter group;
the second calculation module 206 determines an error value of the meter to be measured at the (t + τ) moment relative to the standard electric energy meter group according to the difference value between the meter to be measured at the (t + τ) moment and the reference meter r;
the electric energy value calculation module 207 determines a calculated value of a difference value of each standard meter relative to the standard electric energy meter group at the (t + τ) moment according to an error value of each standard electric energy meter and the meter to be measured at the (t + τ) moment and an error value of the reference meter r and the standard electric energy meter group at the (t + τ) moment.
The method can be applied to calibration of standard electric energy meters with the accuracy level of ten-thousandth, the accuracy of the standard electric energy meter set is better than one-thousandth through the standard electric energy meter set established by the method, the measured electric energy of the standard electric energy meter set is compared with the electric energy to be measured, the quantity value transmission to the electric energy to be measured is realized, an easily-realized quantity value transmission method is provided for laboratory detection personnel, and the accuracy of a measuring standard device can be improved to five hundred thousandth on the premise that hardware is not updated.
Claims (6)
1. A method of energy magnitude transfer based on a standard energy meter bank, the method comprising:
building a standard electric energy meter group, acquiring uncertainty of the standard electric energy meter, and selecting the standard electric energy meter with the minimum uncertainty as a reference meter r;
connecting the meter to be measured with the standard electric energy meter group, and obtaining an error value of each standard electric energy meter and the meter to be measured after the standard electric energy meter group works;
acquiring a difference value and a metering error value of the ith standard meter relative to the standard electric energy meter group at the moment t, and predicting a predicted value of the difference value of the ith standard meter relative to the standard electric energy meter group at the moment (t + tau);
determining the weight omega of each standard meter according to the predicted value of the difference value between the ith standard meter and the standard electric energy meter group at the time t and the calculated value of the difference value between the standard meter and the standard electric energy meter group at the time t i ；
According to the predicted value of the difference value between the ith standard meter and the standard electric energy meter group at the (t + tau) moment, expressing the predicted value of the error value between the reference meter r and the standard electric energy meter according to the weight omega i Calculating an error value between the reference meter r at the (t + tau) moment and the standard electric energy meter group;
determining the error value of the meter to be measured at the (t + tau) moment relative to the standard electric energy meter group according to the difference value of the meter to be measured at the (t + tau) moment and the reference meter r;
and determining a calculated value of the difference value of each standard meter relative to the standard electric energy meter group at the (t + tau) moment according to the error value of each standard electric energy meter and the to-be-measured meter at the (t + tau) moment and the error value of the reference meter r and the standard electric energy meter group at the (t + tau) moment.
2. The method of claim 1, wherein the standard electric energy meter group comprises: the communication interface is used for transmitting data and instructions, receiving and transmitting test data and controlling the working state of the standard electric energy meter.
3. The method of claim 1, wherein the standard electric energy meter is one in ten thousandth and less accurate.
4. The method according to claim 1, wherein in the set of standard electric energy meters, the accuracy of a single standard electric energy meter is one ten thousandth, when the accuracy of the meter to be tested is lower than one ten thousandth, the working state of the standard electric energy meter is controlled through the communication interface, and only one standard electric energy meter is connected for calibration; and when the accuracy of the meter to be measured is one ten-thousandth, all the standard electric energy meters in the standard electric energy meter group work to finish the calibration work.
5. The method of claim 1, wherein the error value is a power error value measured from a standard meter.
6. A system for electric energy quantity value transfer based on a standard electric energy meter bank, the system comprising:
determining a reference meter module, building a standard electric energy meter group, acquiring the uncertainty of the standard electric energy meter, and selecting the standard electric energy meter with the minimum uncertainty as a reference meter r;
the parameter acquisition module is used for accessing the meters to be tested into the standard electric energy meter group, and acquiring the error value of each standard electric energy meter and the meter to be tested after the standard electric energy meter group works;
the predicted value obtaining module is used for obtaining the difference value and the metering error value of the ith standard meter relative to the standard electric energy meter group at the moment t and predicting the predicted value of the difference value of the ith standard meter relative to the standard electric energy meter group at the moment (t + tau);
the weight obtaining module is used for determining the weight omega of each standard meter according to the predicted value of the difference value between the ith standard meter and the standard electric energy meter group at the moment t and the calculated value of the difference value between the standard meter and the standard electric energy meter group at the moment t i ；
The first calculation module represents the predicted value of the error value of the reference meter r and the standard electric energy meter according to the predicted value of the difference value between the ith standard meter and the standard electric energy meter group at the (t + tau) moment and according to the weight omega i Calculating an error value between the reference meter r at the (t + tau) moment and the standard electric energy meter group;
the second calculation module is used for determining the error value of the meter to be measured at the (t + tau) moment relative to the standard electric energy meter group according to the difference value between the meter to be measured at the (t + tau) moment and the reference meter r;
and the electric energy value calculation module is used for determining a calculated value of the difference value of each standard meter relative to the standard electric energy meter group at the (t + tau) moment according to the error value of each standard electric energy meter and the meter to be measured and the error value of the reference meter r and the standard electric energy meter group at the (t + tau) moment.
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