CN117406155A - Calibration method and device suitable for new energy metering equipment - Google Patents
Calibration method and device suitable for new energy metering equipment Download PDFInfo
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- CN117406155A CN117406155A CN202311382897.4A CN202311382897A CN117406155A CN 117406155 A CN117406155 A CN 117406155A CN 202311382897 A CN202311382897 A CN 202311382897A CN 117406155 A CN117406155 A CN 117406155A
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- 238000005259 measurement Methods 0.000 claims abstract description 29
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to the technical field of metering equipment, and discloses a calibration method and device suitable for new energy metering equipment. According to the specification and the calibration requirement of the electric energy meter to be calibrated, the method determines the measurement range and the accuracy of the calibration equipment; determining characteristic parameters to be calibrated and accuracy requirements corresponding to the characteristic parameters according to a characteristic parameter list of the electric energy meter to be calibrated; according to the characteristic parameters, carrying out fundamental wave calibration, harmonic wave calibration and high-low temperature calibration on the electric energy meter to be calibrated through the calibration equipment, collecting an output value of the calibration equipment and an output value of the electric energy meter to be calibrated, carrying out error analysis on the collected output values, and calculating to obtain an output error value; and adjusting the electric energy meter to be calibrated according to the output error value, so that the electric energy meter to be calibrated meets the accuracy requirement corresponding to the characteristic parameter. The invention can improve the accuracy of measuring the characteristic parameters of the new energy, improve the calibration accuracy of the new energy metering equipment and meet the actual demands.
Description
Technical Field
The invention relates to the technical field of metering equipment, in particular to a calibration method and device suitable for new energy metering equipment.
Background
With the rising and wide popularization of new energy technologies, higher requirements on metering equipment have been put forward in application scenes such as electric vehicle charging and distributed photovoltaic power generation. The new energy metering equipment has the new functional characteristics of wide range, bidirectional metering, harmonic metering and the like, and the new functional requirements also put higher demands on the calibration method of the new energy metering equipment. All metering devices can be calibrated when the metering devices come out of the field, the calibration can adjust the metering coefficients inside the metering devices, the difference between different hardware is shielded through the metering coefficients, and each metering device can reach designed metering precision.
The calibration of the metering equipment at present mainly comprises the steps of applying voltage, current and phase angle of a set working condition to the calibrated metering equipment through a table body, reading voltage, current, power and phase angle data of the metering equipment through upper computer software of a meter calibrating table body after waiting for a period of time for stabilizing the working condition, reading voltage, current, power and phase angle data of a standard meter on the table body, obtaining errors through comparing differences between the two data and converting the errors into a proportional relation, and setting the proportional relation into the metering equipment for internal storage to finish meter calibration. Because the grid environment is more complex after new energy is connected, factors such as harmonic waves, low power factors, tide changes and the like can influence the metering precision of the electric energy meter, the traditional electric energy meter calibration technology cannot meet the electric energy meter calibration requirement under the condition of high-proportion new energy access.
Disclosure of Invention
The invention provides a calibration method and a device suitable for new energy metering equipment, which can improve the accuracy of measuring the characteristic parameters of new energy, improve the calibration precision of the new energy metering equipment and meet the actual demands.
In order to solve the technical problems, the invention provides a calibration method suitable for new energy metering equipment, which comprises the following steps:
setting the measurement range and accuracy of the calibration equipment according to the specification and the calibration requirement of the electric energy meter to be calibrated;
determining characteristic parameters to be calibrated and accuracy requirements corresponding to the characteristic parameters according to a characteristic parameter list of the electric energy meter to be calibrated;
according to the characteristic parameters, the electric energy meter to be calibrated is calibrated and measured through the calibration equipment, and the output value of the calibration equipment and the output value of the electric energy meter to be calibrated are collected; the calibration measurement comprises fundamental wave calibration, harmonic wave calibration and high-low temperature calibration;
analyzing the output value of the calibration equipment and the output value of the electric energy meter to be calibrated, and calculating an output error value;
and adjusting the electric energy meter to be calibrated according to the output error value so that the output error values of the calibration equipment and the electric energy meter to be calibrated meet the accuracy requirements corresponding to the characteristic parameters.
Further, the fundamental wave calibration specifically includes:
connecting the calibration equipment and the electric energy meter to be calibrated; the calibration device is connected with a voltage path of the electric energy meter to be calibrated in parallel, and the calibration device is connected with a current path of the electric energy meter to be calibrated in series;
controlling the calibration equipment to issue a rated voltage working condition, and sequentially issuing a calibration starting command and a calibration offset command to the electric energy meter to be calibrated by utilizing an upper computer of the calibration equipment, so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period of receiving the calibration starting command and the calibration offset command, and determines the average value as a calibration parameter offset value;
respectively calculating a fundamental wave gain calibration coefficient and a fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated;
according to the characteristic parameters, a first reading is read from the electric energy meter to be calibrated;
and correcting the first reading according to the calibration parameter offset value, the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient, and determining an output value of the electric energy meter to be calibrated.
Further, the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated are calculated respectively, specifically:
the calibration equipment sends rated working conditions to the electric energy meter to be calibrated, so that the electric energy meter to be calibrated obtains the size of calibration parameters through an upper computer, and the size of the calibration parameters is calculated in the electric energy meter to be calibrated;
and performing proportional operation on the calibration parameters acquired by the upper computer and the calibration parameters calculated in the electric energy meter to be calibrated to obtain fundamental wave gain calibration coefficients of the calibration parameters.
Further, the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated are calculated respectively, specifically:
issuing a working condition of a preset angle to the electric energy meter to be calibrated through the calibration equipment, so that the electric energy meter to be calibrated calculates a phase angle difference between the electric energy meter to be calibrated and the calibration equipment, and acquiring phase angle information from a chip phase angle register of the electric energy meter to be calibrated;
and calculating a fundamental wave phase angle calibration coefficient according to the calculated phase angle difference between the electric energy meter to be calibrated and the calibration equipment and the phase angle information obtained from the chip phase angle register.
Further, the calculating the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated respectively further includes:
obtaining a product specification of the electric energy meter to be calibrated, and judging a current section with poor linearity of the electric energy meter to be calibrated according to a preset linearity standard;
and carrying out sectional processing on the current section with the linear degree difference of the electric energy meter to be calibrated, and carrying out compensation processing on the basis of the original fundamental wave gain calibration coefficient and the original fundamental wave phase angle calibration coefficient to obtain the modified fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient.
Further, the harmonic calibration specifically includes:
controlling the calibration equipment to issue a plurality of subharmonic working conditions so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period of receiving the subharmonic working conditions;
comparing the average value of the calibration parameters in the time period of receiving a plurality of harmonic working conditions with the standard working conditions issued by the calibration equipment to obtain a harmonic error value;
compensating according to the harmonic error value, and calculating a harmonic gain calibration coefficient and a harmonic phase angle calibration coefficient;
according to the characteristic parameters, a second reading is read from the electric energy meter to be calibrated;
and correcting the second reading according to the harmonic gain calibration coefficient and the harmonic phase angle calibration coefficient, and determining an output value of the electric energy meter to be calibrated.
Further, the high-low temperature calibration specifically includes:
collecting output data of the electric energy meter to be calibrated in a plurality of temperature environments;
forming a temperature change relation table according to the temperature environments;
fitting a corresponding temperature curve according to the output data of the temperature change relation meter and the electric energy meter to be calibrated in a plurality of temperature environments, and calculating a high-low temperature calibration coefficient;
according to the characteristic parameters, a third reading is read from the electric energy meter to be calibrated;
and correcting the third reading according to the high-low temperature calibration coefficient, and determining the output value of the electric energy meter to be calibrated.
The invention provides a calibration method suitable for new energy metering equipment, which is used for determining the measurement range and accuracy of calibration equipment according to the specification and the calibration requirement of an electric energy meter to be calibrated; determining characteristic parameters to be calibrated and accuracy requirements corresponding to the characteristic parameters according to a characteristic parameter list of the electric energy meter to be calibrated; according to the characteristic parameters, carrying out fundamental wave calibration, harmonic wave calibration and high-low temperature calibration on the electric energy meter to be calibrated through the calibration equipment, collecting an output value of the calibration equipment and an output value of the electric energy meter to be calibrated, carrying out error analysis on the collected output values, and calculating to obtain an output error value; and adjusting the electric energy meter to be calibrated according to the output error value, so that the electric energy meter to be calibrated meets the accuracy requirement corresponding to the characteristic parameter. The invention can ensure that the electric energy meter can accurately measure the characteristic parameters of the new energy in a wide application scene, improves the accuracy of measuring the characteristic parameters of the new energy, improves the calibration precision of the new energy metering equipment and meets the actual requirements.
Correspondingly, the invention provides a calibration device suitable for new energy metering equipment, which comprises: the device comprises a setting module, a parameter determining module, a calibration measuring module, an analyzing module and an adjusting module;
the setting module is used for setting the measuring range and accuracy of the calibration equipment according to the specification and the calibration requirement of the electric energy meter to be calibrated;
the parameter determining module is used for determining the characteristic parameters to be calibrated and the accuracy requirements corresponding to the characteristic parameters according to the characteristic parameter list of the electric energy meter to be calibrated;
the calibration measurement module is used for carrying out calibration measurement on the electric energy meter to be calibrated through the calibration equipment according to the characteristic parameters, and collecting an output value of the calibration equipment and an output value of the electric energy meter to be calibrated; the calibration measurement comprises fundamental wave calibration, harmonic wave calibration and high-low temperature calibration;
the analysis module is used for analyzing the output value of the calibration equipment and the output value of the electric energy meter to be calibrated and calculating an output error value;
the adjustment module is used for adjusting the electric energy meter to be calibrated according to the output error value so that the output error values of the calibration equipment and the electric energy meter to be calibrated meet the accuracy requirements corresponding to the characteristic parameters.
Further, the calibration measurement module includes: the device comprises a connecting unit, a first control unit, a first calculation unit, a first reading unit and a first correction unit;
the connecting unit is used for connecting the calibration equipment and the electric energy meter to be calibrated; the calibration device is connected with a voltage path of the electric energy meter to be calibrated in parallel, and the calibration device is connected with a current path of the electric energy meter to be calibrated in series;
the first control unit is used for controlling the calibration equipment to send out a rated voltage working condition, and utilizing an upper computer of the calibration equipment to send out a calibration starting command and a calibration offset command to the electric energy meter to be calibrated in sequence, so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period when the calibration starting command and the calibration offset command are received, and the average value is determined to be a calibration parameter offset value;
the first calculation unit is used for calculating a fundamental wave gain calibration coefficient and a fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated respectively;
the first reading unit is used for reading a first reading from the electric energy meter to be calibrated according to the characteristic parameters;
the first correction unit is used for correcting the first reading according to the calibration parameter offset value, the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient, and determining an output value of the electric energy meter to be calibrated.
Further, the calibration measurement module includes: the second control unit, the comparison unit, the second calculation unit, the second reading unit and the second correction unit;
the second control unit is used for controlling the calibration equipment to issue a plurality of harmonic working conditions so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period of receiving the harmonic working conditions;
the comparison unit is used for comparing the average value of the calibration parameters in the time period of receiving a plurality of harmonic working conditions with the standard working conditions issued by the calibration equipment to obtain a harmonic error value;
the second calculation unit is used for compensating according to the harmonic error value and calculating a harmonic gain calibration coefficient and a harmonic phase angle calibration coefficient;
the second reading unit is used for reading a second reading from the electric energy meter to be calibrated according to the characteristic parameters;
and the second correction unit is used for correcting the second reading according to the harmonic gain calibration coefficient and the harmonic phase angle calibration coefficient and determining an output value of the electric energy meter to be calibrated.
The invention provides a calibration device suitable for new energy metering equipment, which is used for determining the measurement range and accuracy of calibration equipment according to the specification and the calibration requirement of an electric energy meter to be calibrated based on the organic combination among modules; determining characteristic parameters to be calibrated and accuracy requirements corresponding to the characteristic parameters according to a characteristic parameter list of the electric energy meter to be calibrated; according to the characteristic parameters, carrying out fundamental wave calibration, harmonic wave calibration and high-low temperature calibration on the electric energy meter to be calibrated through the calibration equipment, collecting an output value of the calibration equipment and an output value of the electric energy meter to be calibrated, carrying out error analysis on the collected output values, and calculating to obtain an output error value; and adjusting the electric energy meter to be calibrated according to the output error value, so that the electric energy meter to be calibrated meets the accuracy requirement corresponding to the characteristic parameter. The invention can ensure that the electric energy meter can accurately measure the characteristic parameters of the new energy in a wide application scene, improves the accuracy of measuring the characteristic parameters of the new energy, improves the calibration precision of the new energy metering equipment and meets the actual requirements.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a calibration method for a new energy metering device according to the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a calibration device suitable for a new energy metering device according to the present invention.
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.
Example 1
Referring to fig. 1, a flow chart of an embodiment of a calibration method for a new energy metering device provided by the present invention is shown, where the method includes steps 101 to 105, and the steps are specifically as follows:
step 101: and setting the measurement range and accuracy of the calibration equipment according to the specification and the calibration requirement of the electric energy meter to be calibrated.
In the first embodiment of the invention, the new energy source is connected to the grid, so that the grid environment is more complex, and factors such as harmonic waves, low power factors, tide changes and the like can influence the metering accuracy of the electric energy meter. The traditional electric energy meter calibration technology cannot meet the electric energy meter calibration requirement under the condition of high-proportion new energy access, so that corresponding calibration equipment is required to be prepared in order to ensure that the electric energy meter can accurately measure the characteristic parameters of the new energy in a wide application scene, and the actual requirements are met. Calibration devices for calibration require current sources, voltage sources, power factor sources and frequency sources with high accuracy. Before the electric energy meter is calibrated, the measurement range (including the voltage range, the current range, the frequency range and the like) and the accuracy of the calibration equipment are required to be set according to the specification and the requirement of the electric energy meter to be calibrated.
Step 102: and determining the characteristic parameters to be calibrated and accuracy requirements corresponding to the characteristic parameters according to the characteristic parameter list of the electric energy meter to be calibrated.
In the first embodiment of the invention, according to the characteristic parameter list of the electric energy meter to be calibrated, the characteristic parameters to be calibrated are selected, and the target accuracy of the calibration is determined. The characteristic parameters to be calibrated include current, voltage, power factor, harmonic wave and the like.
Step 103: according to the characteristic parameters, the electric energy meter to be calibrated is calibrated and measured through the calibration equipment, and the output value of the calibration equipment and the output value of the electric energy meter to be calibrated are collected; wherein the calibration measurements include fundamental calibration, harmonic calibration, and high and low temperature calibration.
In the first embodiment of the invention, when the electric energy meter to be calibrated is calibrated by using the calibration equipment, the calibration equipment is connected to the electric energy meter to be calibrated, so that the electric energy meter to be calibrated outputs a required test signal. And then measuring the output value of the electric energy meter to be calibrated, comparing the output values of the electric energy meter to be calibrated and the calibration equipment, and carrying out error analysis. The calibration of the electric energy meter to be calibrated by using the calibration device comprises fundamental wave calibration, harmonic wave calibration and high-low temperature calibration.
Further, in the first embodiment of the present invention, the fundamental calibration is specifically:
connecting the calibration equipment and the electric energy meter to be calibrated; the calibration device is connected with a voltage path of the electric energy meter to be calibrated in parallel, and the calibration device is connected with a current path of the electric energy meter to be calibrated in series;
controlling the calibration equipment to issue a rated voltage working condition, and sequentially issuing a calibration starting command and a calibration offset command to the electric energy meter to be calibrated by utilizing an upper computer of the calibration equipment, so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period of receiving the calibration starting command and the calibration offset command, and determines the average value as a calibration parameter offset value;
respectively calculating a fundamental wave gain calibration coefficient and a fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated;
according to the characteristic parameters, a first reading is read from the electric energy meter to be calibrated;
and correcting the first reading according to the calibration parameter offset value, the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient, and determining an output value of the electric energy meter to be calibrated.
In the first embodiment of the present invention, since there is a noise floor in the hardware of the ammeter and the ADC chip, the sampling data of the ADC is not 0 in the absence of the current, so that the current and the power are measured out, and therefore, an offset calibration is required to remove noise interference. When fundamental wave calibration is carried out, firstly, an electric energy meter to be calibrated and calibration equipment are connected together, voltage paths are connected in parallel, and current paths are connected in series; the calibration equipment is controlled to send out a rated voltage working condition so as to enable the electric energy meter to be electrified stably, an upper computer of the calibration equipment sends out a calibration starting command, and the data of voltage, current and power are accumulated in the electric energy meter; and after a period of time, issuing a calibration offset command, calculating the average value of voltage, current and power in the period of time from the time when the calibration command is received to the time when the calibration offset command is received by the electric energy meter, and writing the average value into a calibration parameter offset value of the electric energy meter so as to correspondingly subtract the offset value when the effective metering value is calculated later, namely, outputting metering data=current metering data-offset.
Further, in the first embodiment of the present invention, the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated are calculated respectively, specifically:
the calibration equipment sends rated working conditions to the electric energy meter to be calibrated, so that the electric energy meter to be calibrated obtains the size of calibration parameters through an upper computer, and the size of the calibration parameters is calculated in the electric energy meter to be calibrated;
and performing proportional operation on the calibration parameters acquired by the upper computer and the calibration parameters calculated in the electric energy meter to be calibrated to obtain fundamental wave gain calibration coefficients of the calibration parameters.
In the first embodiment of the invention, the product hardware, whether the transformer and the manganese copper or the sampling resistor and the sigma-delta ADC, has a theoretical value and an actual value, for example, the theoretical value of 10Ω resistor is 10Ω, but there is a practical error, which may be 9.8Ω, so that the signal amplitude needs to be calibrated. The calibration equipment is utilized to apply rated working conditions to the electric energy meter to be calibrated, the electric energy meter obtains the voltage, current and power value of the meter table through the upper computer, the calculation data of the voltage, current and power in the meter is counted in the meter, the obtained two data are subjected to proportional operation, gain calibration coefficients of the voltage, the current and the power can be obtained, and the gain calibration coefficients are stored in a memory of the electric energy meter so as to be convenient for subsequent operation and use.
Further, in the first embodiment of the present invention, the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated are calculated respectively, specifically:
issuing a working condition of a preset angle to the electric energy meter to be calibrated through the calibration equipment, so that the electric energy meter to be calibrated calculates a phase angle difference between the electric energy meter to be calibrated and the calibration equipment, and acquiring phase angle information from a chip phase angle register of the electric energy meter to be calibrated;
and calculating a fundamental wave phase angle calibration coefficient according to the calculated phase angle difference between the electric energy meter to be calibrated and the calibration equipment and the phase angle information obtained from the chip phase angle register.
In the first embodiment of the present invention, since the gauge uses a transformer or an anti-aliasing circuit and an ADC or the like to generate an angular difference so that the angle between the acquired voltage and current is different from the actual angle, it is necessary to perform angular calibration. And sending a working condition with a relatively sensitive angle to the electric energy meter to be calibrated, such as a 0.5I working condition, by using the calibration equipment, calculating the phase angle difference between the actual meter and the meter table according to the power or the phase angle of the electric energy meter to be calibrated, further calculating a phase angle calibration coefficient according to the related information of the chip phase angle register, and writing the phase angle calibration coefficient into the chip so as to correct the phase angle error.
Further, in the first embodiment of the present invention, the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated are calculated respectively, and the method further includes:
obtaining a product specification of the electric energy meter to be calibrated, and judging a current section with poor linearity of the electric energy meter to be calibrated according to a preset linearity standard;
and carrying out sectional processing on the current section with the linear degree difference of the electric energy meter to be calibrated, and carrying out compensation processing on the basis of the original fundamental wave gain calibration coefficient and the original fundamental wave phase angle calibration coefficient to obtain the modified fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient.
In the first embodiment of the invention, the product transformer, the ADC and the related sampling device have certain linearity problems, so that the product specification of the related device is required to be obtained, the current segment with poor linearity is subjected to segmentation processing, the gain coefficient and the phase angle calibration coefficient are changed according to the angle difference and the ratio difference of different segmentation devices, and the segmentation processing is performed. And carrying out compensation processing on the basis of the original calibration coefficients to obtain different calibration coefficients, and storing the calibration coefficients in a memory of the electric energy meter for subsequent operation.
Further, in the first embodiment of the present invention, the harmonic calibration is specifically:
controlling the calibration equipment to issue a plurality of subharmonic working conditions so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period of receiving the subharmonic working conditions;
comparing the average value of the calibration parameters in the time period of receiving a plurality of harmonic working conditions with the standard working conditions issued by the calibration equipment to obtain a harmonic error value;
compensating according to the harmonic error value, and calculating a harmonic gain calibration coefficient and a harmonic phase angle calibration coefficient;
according to the characteristic parameters, a second reading is read from the electric energy meter to be calibrated;
and correcting the second reading according to the harmonic gain calibration coefficient and the harmonic phase angle calibration coefficient, and determining an output value of the electric energy meter to be calibrated.
In the first embodiment of the present invention, the ADC sampling chip and the front-end sampling tend to have attenuation effects on harmonics of different frequencies. Therefore, the harmonic wave needs to be calibrated. The method comprises the steps of carrying out harmonic calibration by using calibration equipment with an accurate harmonic output function, controlling the calibration equipment to output multiple harmonic working conditions (such as 1.0 and 0.5L working conditions), calculating average values of harmonic voltage, current and power in a period of time after the electric energy meter to be calibrated receives working condition data, comparing the data calculated in the meter with standard working condition data acquired by the calibration equipment, calculating a gain harmonic coefficient by using voltage and current amplitude values, and calculating a phase angle harmonic coefficient by using phase angle difference.
Further, in the first embodiment of the present invention, the high-low temperature calibration is specifically:
collecting output data of the electric energy meter to be calibrated in a plurality of temperature environments;
forming a temperature change relation table according to the temperature environments;
fitting a corresponding temperature curve according to the output data of the temperature change relation meter and the electric energy meter to be calibrated in a plurality of temperature environments, and calculating a high-low temperature calibration coefficient;
according to the characteristic parameters, a third reading is read from the electric energy meter to be calibrated;
and correcting the third reading according to the high-low temperature calibration coefficient, and determining the output value of the electric energy meter to be calibrated.
In the first embodiment of the present invention, since the meter changes related devices of the sampling circuit under different temperature environments, and errors are caused, high and low temperature calibration is required. And respectively acquiring measured data of the electric energy meter to be calibrated in different temperature environments, fitting a corresponding temperature curve according to the temperature change relation diagram and the measured data of each phenotype device, and calculating a high-low temperature calibration coefficient to realize high-low temperature calibration.
Step 104: and analyzing the output value of the calibration equipment and the output value of the electric energy meter to be calibrated, and calculating an output error value.
Step 105: and adjusting the electric energy meter to be calibrated according to the output error value so that the output error values of the calibration equipment and the electric energy meter to be calibrated meet the accuracy requirements corresponding to the characteristic parameters.
In the first embodiment of the present invention, after an output value of a calibration device and an output value of an electric energy meter to be calibrated are analyzed to obtain an output error value, the electric energy meter to be calibrated is adjusted according to the obtained output error value, and the adjusted electric energy meter to be calibrated is calibrated and measured again by using the calibration device, so as to calculate the output error value, if the output error value of the adjusted electric energy meter does not meet the accuracy requirement corresponding to the characteristic parameter, the calibration operation needs to be repeatedly performed until the output error value of the electric energy meter meets the accuracy requirement corresponding to the characteristic parameter.
In summary, the first embodiment of the present invention provides a calibration method suitable for a new energy metering device, and according to the specification and calibration requirement of an electric energy meter to be calibrated, the measurement range and accuracy of the calibration device are determined; determining characteristic parameters to be calibrated and accuracy requirements corresponding to the characteristic parameters according to a characteristic parameter list of the electric energy meter to be calibrated; according to the characteristic parameters, carrying out fundamental wave calibration, harmonic wave calibration and high-low temperature calibration on the electric energy meter to be calibrated through the calibration equipment, collecting an output value of the calibration equipment and an output value of the electric energy meter to be calibrated, carrying out error analysis on the collected output values, and calculating to obtain an output error value; and adjusting the electric energy meter to be calibrated according to the output error value, so that the electric energy meter to be calibrated meets the accuracy requirement corresponding to the characteristic parameter. The invention can ensure that the electric energy meter can accurately measure the characteristic parameters of the new energy in a wide application scene, improves the accuracy of measuring the characteristic parameters of the new energy, improves the calibration precision of the new energy metering equipment and meets the actual requirements.
Example 2
Referring to fig. 2, a schematic structural diagram of an embodiment of a calibration device suitable for a new energy metering device according to the present invention includes a setting module 201, a parameter determining module 202, a calibration measuring module 203, an analyzing module 204, and an adjusting module 205;
the setting module 201 is configured to set a measurement range and accuracy of the calibration device according to a specification and a calibration requirement of the electric energy meter to be calibrated;
the parameter determining module 202 is configured to determine a characteristic parameter to be calibrated and an accuracy requirement corresponding to the characteristic parameter according to a characteristic parameter list of the electric energy meter to be calibrated;
the calibration measurement module 203 is configured to perform calibration measurement on the electric energy meter to be calibrated through the calibration device according to the characteristic parameter, and collect an output value of the calibration device and an output value of the electric energy meter to be calibrated; the calibration measurement comprises fundamental wave calibration, harmonic wave calibration and high-low temperature calibration;
the analysis module 204 is configured to analyze the output value of the calibration device and the output value of the electric energy meter to be calibrated, and calculate an output error value;
the adjustment module 205 is configured to adjust the electric energy meter to be calibrated according to the output error value, so that the output error values of the calibration device and the electric energy meter to be calibrated meet the accuracy requirement corresponding to the characteristic parameter.
Further, in the second embodiment of the present invention, the calibration measurement module 203 includes: the device comprises a connecting unit, a first control unit, a first calculation unit, a first reading unit and a first correction unit;
the connecting unit is used for connecting the calibration equipment and the electric energy meter to be calibrated; the calibration device is connected with a voltage path of the electric energy meter to be calibrated in parallel, and the calibration device is connected with a current path of the electric energy meter to be calibrated in series;
the first control unit is used for controlling the calibration equipment to send out a rated voltage working condition, and utilizing an upper computer of the calibration equipment to send out a calibration starting command and a calibration offset command to the electric energy meter to be calibrated in sequence, so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period of receiving the calibration starting command and the calibration offset command, and determines the average value as a calibration parameter offset value;
the first calculation unit is used for calculating a fundamental wave gain calibration coefficient and a fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated respectively;
the first reading unit is used for reading a first reading from the electric energy meter to be calibrated according to the characteristic parameters;
the first correction unit is used for correcting the first reading according to the calibration parameter offset value, the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient, and determining an output value of the electric energy meter to be calibrated.
Further, in the second embodiment of the present invention, the first calculating unit specifically includes:
the calibration equipment sends rated working conditions to the electric energy meter to be calibrated, so that the electric energy meter to be calibrated obtains the size of calibration parameters through an upper computer, and the size of the calibration parameters is calculated in the electric energy meter to be calibrated;
and performing proportional operation on the calibration parameters acquired by the upper computer and the calibration parameters calculated in the electric energy meter to be calibrated to obtain fundamental wave gain calibration coefficients of the calibration parameters.
Further, in the second embodiment of the present invention, the first calculating unit specifically includes:
issuing a working condition of a preset angle to the electric energy meter to be calibrated through the calibration equipment, so that the electric energy meter to be calibrated calculates a phase angle difference between the electric energy meter to be calibrated and the calibration equipment, and acquiring phase angle information from a chip phase angle register of the electric energy meter to be calibrated;
and calculating a fundamental wave phase angle calibration coefficient according to the calculated phase angle difference between the electric energy meter to be calibrated and the calibration equipment and the phase angle information obtained from the chip phase angle register.
Further, in a second embodiment of the present invention, the first computing unit further includes:
obtaining a product specification of the electric energy meter to be calibrated, and judging a current section with poor linearity of the electric energy meter to be calibrated according to a preset linearity standard;
and carrying out sectional processing on the current section with the linear degree difference of the electric energy meter to be calibrated, and carrying out compensation processing on the basis of the original fundamental wave gain calibration coefficient and the original fundamental wave phase angle calibration coefficient to obtain the modified fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient.
Further, in the second embodiment of the present invention, the calibration measurement module 203 includes: the second control unit, the comparison unit, the second calculation unit, the second reading unit and the second correction unit;
the second control unit is used for controlling the calibration equipment to issue a plurality of harmonic working conditions so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period of receiving the harmonic working conditions;
the comparison unit is used for comparing the average value of the calibration parameters in the time period of receiving a plurality of harmonic working conditions with the standard working conditions issued by the calibration equipment to obtain a harmonic error value;
the second calculation unit is used for compensating according to the harmonic error value and calculating a harmonic gain calibration coefficient and a harmonic phase angle calibration coefficient;
the second reading unit is used for reading a second reading from the electric energy meter to be calibrated according to the characteristic parameters;
and the second correction unit is used for correcting the second reading according to the harmonic gain calibration coefficient and the harmonic phase angle calibration coefficient and determining the output value of the electric energy meter to be calibrated.
Further, in the second embodiment of the present invention, the calibration measurement module 203 includes: the system comprises an acquisition unit, a relation table forming unit, a third calculation unit, a third reading unit and a third correction unit;
the acquisition unit is used for acquiring output data of the electric energy meter to be calibrated in a plurality of temperature environments;
the relation table forming unit is used for forming a temperature change relation table according to the plurality of temperature environments;
the third calculation unit is used for fitting a corresponding temperature curve according to the output data of the temperature change relation table and the electric energy meter to be calibrated in a plurality of temperature environments, and calculating a high-low temperature calibration coefficient;
the third reading unit is used for reading a third reading from the electric energy meter to be calibrated according to the characteristic parameters;
and the third correction unit is used for correcting the third reading according to the high-low temperature calibration coefficient and determining the output value of the electric energy meter to be calibrated.
In summary, the second embodiment of the present invention provides a calibration device suitable for a new energy metering device, which is based on the organic combination between modules, and determines the measurement range and accuracy of the calibration device according to the specification and calibration requirement of the electric energy meter to be calibrated; determining characteristic parameters to be calibrated and accuracy requirements corresponding to the characteristic parameters according to a characteristic parameter list of the electric energy meter to be calibrated; according to the characteristic parameters, carrying out fundamental wave calibration, harmonic wave calibration and high-low temperature calibration on the electric energy meter to be calibrated through the calibration equipment, collecting an output value of the calibration equipment and an output value of the electric energy meter to be calibrated, carrying out error analysis on the collected output values, and calculating to obtain an output error value; and adjusting the electric energy meter to be calibrated according to the output error value, so that the electric energy meter to be calibrated meets the accuracy requirement corresponding to the characteristic parameter. The invention can ensure that the electric energy meter can accurately measure the characteristic parameters of the new energy in a wide application scene, improves the accuracy of measuring the characteristic parameters of the new energy, improves the calibration precision of the new energy metering equipment and meets the actual requirements.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. A calibration method for a new energy metering device, comprising:
setting the measurement range and accuracy of the calibration equipment according to the specification and the calibration requirement of the electric energy meter to be calibrated;
determining characteristic parameters to be calibrated and accuracy requirements corresponding to the characteristic parameters according to a characteristic parameter list of the electric energy meter to be calibrated;
according to the characteristic parameters, the electric energy meter to be calibrated is calibrated and measured through the calibration equipment, and the output value of the calibration equipment and the output value of the electric energy meter to be calibrated are collected; the calibration measurement comprises fundamental wave calibration, harmonic wave calibration and high-low temperature calibration;
analyzing the output value of the calibration equipment and the output value of the electric energy meter to be calibrated, and calculating an output error value;
and adjusting the electric energy meter to be calibrated according to the output error value so that the output error values of the calibration equipment and the electric energy meter to be calibrated meet the accuracy requirements corresponding to the characteristic parameters.
2. The calibration method for a new energy metering device according to claim 1, characterized in that the fundamental calibration is in particular:
connecting the calibration equipment and the electric energy meter to be calibrated; the calibration device is connected with a voltage path of the electric energy meter to be calibrated in parallel, and the calibration device is connected with a current path of the electric energy meter to be calibrated in series;
controlling the calibration equipment to issue a rated voltage working condition, and sequentially issuing a calibration starting command and a calibration offset command to the electric energy meter to be calibrated by utilizing an upper computer of the calibration equipment, so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period of receiving the calibration starting command and the calibration offset command, and determines the average value as a calibration parameter offset value;
respectively calculating a fundamental wave gain calibration coefficient and a fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated;
according to the characteristic parameters, a first reading is read from the electric energy meter to be calibrated;
and correcting the first reading according to the calibration parameter offset value, the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient, and determining an output value of the electric energy meter to be calibrated.
3. The calibration method for new energy metering equipment according to claim 2, wherein the calculating of the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated respectively comprises the following specific steps:
the calibration equipment sends rated working conditions to the electric energy meter to be calibrated, so that the electric energy meter to be calibrated obtains the size of calibration parameters through an upper computer, and the size of the calibration parameters is calculated in the electric energy meter to be calibrated;
and performing proportional operation on the calibration parameters acquired by the upper computer and the calibration parameters calculated in the electric energy meter to be calibrated to obtain fundamental wave gain calibration coefficients of the calibration parameters.
4. The calibration method for new energy metering equipment according to claim 2, wherein the calculating of the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated respectively comprises the following specific steps:
issuing a working condition of a preset angle to the electric energy meter to be calibrated through the calibration equipment, so that the electric energy meter to be calibrated calculates a phase angle difference between the electric energy meter to be calibrated and the calibration equipment, and acquiring phase angle information from a chip phase angle register of the electric energy meter to be calibrated;
and calculating a fundamental wave phase angle calibration coefficient according to the calculated phase angle difference between the electric energy meter to be calibrated and the calibration equipment and the phase angle information obtained from the chip phase angle register.
5. The calibration method for a new energy metering device according to any one of claims 2 to 4, wherein the calculating of the fundamental gain calibration coefficient and the fundamental phase angle calibration coefficient of the electric energy meter to be calibrated, respectively, further comprises:
obtaining a product specification of the electric energy meter to be calibrated, and judging a current section with poor linearity of the electric energy meter to be calibrated according to a preset linearity standard;
and carrying out sectional processing on the current section with the linear degree difference of the electric energy meter to be calibrated, and carrying out compensation processing on the basis of the original fundamental wave gain calibration coefficient and the original fundamental wave phase angle calibration coefficient to obtain the modified fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient.
6. The calibration method for a new energy metering device according to claim 1, characterized in that the harmonic calibration is in particular:
controlling the calibration equipment to issue a plurality of subharmonic working conditions so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period of receiving the subharmonic working conditions;
comparing the average value of the calibration parameters in the time period of receiving a plurality of harmonic working conditions with the standard working conditions issued by the calibration equipment to obtain a harmonic error value;
compensating according to the harmonic error value, and calculating a harmonic gain calibration coefficient and a harmonic phase angle calibration coefficient;
according to the characteristic parameters, a second reading is read from the electric energy meter to be calibrated;
and correcting the second reading according to the harmonic gain calibration coefficient and the harmonic phase angle calibration coefficient, and determining an output value of the electric energy meter to be calibrated.
7. The calibration method suitable for new energy metering equipment according to claim 1, wherein the high-low temperature calibration is specifically:
collecting output data of the electric energy meter to be calibrated in a plurality of temperature environments;
forming a temperature change relation table according to the temperature environments;
fitting a corresponding temperature curve according to the output data of the temperature change relation meter and the electric energy meter to be calibrated in a plurality of temperature environments, and calculating a high-low temperature calibration coefficient;
according to the characteristic parameters, a third reading is read from the electric energy meter to be calibrated;
and correcting the third reading according to the high-low temperature calibration coefficient, and determining the output value of the electric energy meter to be calibrated.
8. A calibration device for a new energy metering device, comprising: the device comprises a setting module, a parameter determining module, a calibration measuring module, an analyzing module and an adjusting module;
the setting module is used for setting the measuring range and accuracy of the calibration equipment according to the specification and the calibration requirement of the electric energy meter to be calibrated;
the parameter determining module is used for determining the characteristic parameters to be calibrated and the accuracy requirements corresponding to the characteristic parameters according to the characteristic parameter list of the electric energy meter to be calibrated;
the calibration measurement module is used for carrying out calibration measurement on the electric energy meter to be calibrated through the calibration equipment according to the characteristic parameters, and collecting an output value of the calibration equipment and an output value of the electric energy meter to be calibrated; the calibration measurement comprises fundamental wave calibration, harmonic wave calibration and high-low temperature calibration;
the analysis module is used for analyzing the output value of the calibration equipment and the output value of the electric energy meter to be calibrated and calculating an output error value;
the adjustment module is used for adjusting the electric energy meter to be calibrated according to the output error value so that the output error values of the calibration equipment and the electric energy meter to be calibrated meet the accuracy requirements corresponding to the characteristic parameters.
9. The calibration device for a new energy metering apparatus of claim 8, wherein the calibration measurement module comprises: the device comprises a connecting unit, a first control unit, a first calculation unit, a first reading unit and a first correction unit;
the connecting unit is used for connecting the calibration equipment and the electric energy meter to be calibrated; the calibration device is connected with a voltage path of the electric energy meter to be calibrated in parallel, and the calibration device is connected with a current path of the electric energy meter to be calibrated in series;
the first control unit is used for controlling the calibration equipment to send out a rated voltage working condition, and utilizing an upper computer of the calibration equipment to send out a calibration starting command and a calibration offset command to the electric energy meter to be calibrated in sequence, so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period when the calibration starting command and the calibration offset command are received, and the average value is determined to be a calibration parameter offset value;
the first calculation unit is used for calculating a fundamental wave gain calibration coefficient and a fundamental wave phase angle calibration coefficient of the electric energy meter to be calibrated respectively;
the first reading unit is used for reading a first reading from the electric energy meter to be calibrated according to the characteristic parameters;
the first correction unit is used for correcting the first reading according to the calibration parameter offset value, the fundamental wave gain calibration coefficient and the fundamental wave phase angle calibration coefficient, and determining an output value of the electric energy meter to be calibrated.
10. The calibration device for a new energy metering apparatus of claim 8, wherein the calibration measurement module comprises: the second control unit, the comparison unit, the second calculation unit, the second reading unit and the second correction unit;
the second control unit is used for controlling the calibration equipment to issue a plurality of harmonic working conditions so that the electric energy meter to be calibrated calculates an average value of calibration parameters in a time period of receiving the harmonic working conditions;
the comparison unit is used for comparing the average value of the calibration parameters in the time period of receiving a plurality of harmonic working conditions with the standard working conditions issued by the calibration equipment to obtain a harmonic error value;
the second calculation unit is used for compensating according to the harmonic error value and calculating a harmonic gain calibration coefficient and a harmonic phase angle calibration coefficient;
the second reading unit is used for reading a second reading from the electric energy meter to be calibrated according to the characteristic parameters;
and the second correction unit is used for correcting the second reading according to the harmonic gain calibration coefficient and the harmonic phase angle calibration coefficient and determining an output value of the electric energy meter to be calibrated.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119165242A (en) * | 2024-11-18 | 2024-12-20 | 宁波迦南智能电气股份有限公司 | High-precision harmonic measurement method based on dedicated measurement chip and ARM processor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119165242A (en) * | 2024-11-18 | 2024-12-20 | 宁波迦南智能电气股份有限公司 | High-precision harmonic measurement method based on dedicated measurement chip and ARM processor |
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