CN110568397B - Electric energy meter correction method and system based on MCU software - Google Patents
Electric energy meter correction method and system based on MCU software Download PDFInfo
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- CN110568397B CN110568397B CN201910740549.7A CN201910740549A CN110568397B CN 110568397 B CN110568397 B CN 110568397B CN 201910740549 A CN201910740549 A CN 201910740549A CN 110568397 B CN110568397 B CN 110568397B
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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
- G01R35/02—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
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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 an electric energy meter correction method and system based on MCU software, wherein the electric energy meter correction method based on the MCU software comprises the following steps: s11, obtaining meter calibration data of the electric energy meter; s12, according to the acquired meter calibration data, enabling the MCU software to segment the error curve of the whole measured current to form a plurality of phase compensation areas, and performing error correction processing on each phase compensation area to generate a processing result; s13, generating a calibration table parameter corresponding to each phase compensation area according to the error correction processing result; and S14, writing the calibration parameters into a metering chip to finish calibration.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to an electric energy meter correction method and system based on MCU software.
Background
In recent years, the construction of intelligent power grids in China has been expanded comprehensively, intelligent electric energy meters are widely applied nationwide, electric energy errors of various electric energy meters need to be calibrated before network access metering, and a plurality of calibration methods are adopted.
At present, the method for calibrating the metering chip of the state network electric energy meter compensates the gain, the voltage gain, the power gain and the phase of each phase, the power gain is not proposed to be segmented, the phase calibration is segmented according to the requirement of the accuracy of the electric energy meter, the segmentation is divided according to the current size through a register of the metering chip, the number of the segments is fixed and limited, the segments can be 5 at most, and if the requirement on the accuracy is not high, the segments can not be segmented.
The phase correction is mainly caused by the asymmetry of the angular difference of a current transformer and the parameters of a sampling circuit, and the specific operation is to set (less than or equal to 4) phase compensation area setting registers in a metering chip by software, select the current of a proper correction point according to the set phase compensation area, ensure that satisfactory power precision can be obtained on the area, and write the same correction value into the area 0 to area 4 phase correction register values if the area is not segmented. The segments are set according to the current magnitude, set from the phase compensation region setting 4, and the current minimum segment point is written in the phase compensation region setting 4.
The conventional meter calibration method for the metering chip is that a phase compensation area (less than or equal to 4) and a phase correction value (less than or equal to 5) are stored in an EEPROM, when an electric energy meter is electrified, the phase compensation area (less than or equal to 4) and the phase correction value (less than or equal to 5) in the EEPROM are written into a phase compensation area setting register and a phase correction register in the metering chip, and the metering chip is calibrated according to the correction value in the phase correction register in the corresponding area, so that the meter calibration in a qualified error range is realized.
The defects of the prior art are as follows: if the linearity of the error characteristic curve of the current transformer in the current range is not wide, the number of the register segments of the metering chip is fixed (less than or equal to 5) and is small, and correspondingly, the error correction value is only 5 at most, the calibration process is necessarily deviated from a certain error, and the accuracy of the calibration process is influenced. Meanwhile, the large span of the segmentation points but the low linearity in the span also affects the accuracy of the calibration. If it is necessary to improve the error correction accuracy, segment as many small linear regions as possible, and set the error correction values, there is a limitation.
Disclosure of Invention
The invention aims to provide an electric energy meter correction method and system based on MCU software aiming at the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electric energy meter correction method based on MCU software comprises the following steps:
s1, obtaining meter calibration data of an electric energy meter;
s2, according to the acquired meter calibration data, enabling the MCU software to segment the error curve of the whole measured current to form a plurality of phase compensation areas, and performing error correction processing on each phase compensation area to generate a processing result;
s3, generating a calibration parameter corresponding to each phase compensation area according to the error correction processing result;
and S4, writing the calibration parameters into a metering chip to finish calibration.
Further, step S4 is preceded by:
and the MCU software stores the calibration parameters in a memory.
Further, step S4 is preceded by:
the MCU software reads the current value of the electric energy meter in real time;
judging a phase compensation area where the current corresponding to the current value is located by the MCU software according to the read current value;
and reading the calibration table parameters corresponding to the phase compensation area in the memory by the MCU software.
Further, the error correction in step S2 is to select a suitable phase correction value of the correction point current in the same phase compensation region as the correction value of the phase compensation region through the MCU software.
Further, the suitable correction point current is a current of a point in the phase compensation region.
Further, step S1 is preceded by:
s0. initialize the phase compensation region in the metrology chip.
Further, the table data in step S1 includes a power gain value and a phase correction value; the step S1 specifically includes setting the power gain value to the calibration register of each corresponding phase; and setting the phase correction value to the calibration register of each corresponding phase.
Correspondingly, still provide an electric energy meter correction system based on MCU software, include:
the acquisition module is used for acquiring meter calibration data of the electric energy meter;
the segmentation module is used for segmenting the error curve of the whole current obtained by measurement by the MCU software according to the obtained calibration data to form a plurality of phase compensation areas;
the processing module is used for carrying out error correction processing on each phase compensation area through MCU software to generate a processing result;
the generating module is used for generating a calibration table parameter corresponding to each phase compensation area for the error correction processing result through MCU software;
and the correction module is used for writing the calibration parameters into the metering chip through MCU software to finish correction.
Further, the method also comprises the following steps:
and the storage module is used for storing the calibration parameters in a memory through MCU software.
Further, the method also comprises the following steps:
the first reading module is used for reading the current value of the electric energy meter in real time through MCU software;
the judging module is used for judging a phase compensation area where the current corresponding to the current value is located according to the read current value through MCU software;
and the second reading module is used for reading the calibration table parameters corresponding to the phase compensation area in the memory through MCU software.
Compared with the prior art, the invention has the following advantages:
1. the selection of the multiple linear sections improves the precision of error compensation, so that the metering precision is improved in the actual operation.
2. The actual error characteristic curve of the current transformer can be segmented into a plurality of sections according to different precision requirements, and the calibration method can be applied to the three-phase electric energy meter with the higher precision requirement of 0.5S or 0.2S level.
3. The current can be judged in real time according to the read current to select a compensation value, and the compensation value is written into the metering chip. The real-time performance is enhanced, and the precision is improved.
4. The MCU software is flexibly led to realize segmentation according to the actual situation, and the calibration parameters can be changed in the EEPROM.
Drawings
FIG. 1 is a flowchart of a calibration method of an electric energy meter based on MCU software according to an embodiment;
FIG. 2 is a schematic sectional view of the error curve current of the current transformer provided in the first embodiment and the second embodiment;
fig. 3 is a structural diagram of an electric energy meter calibration system based on MCU software according to the second embodiment.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The invention aims to provide an electric energy meter correction method and system based on MCU software aiming at the defects of the prior art.
Example one
The electric energy meter correction method based on the MCU software of this embodiment, as shown in fig. 1, includes the steps of:
s11, obtaining meter calibration data of the electric energy meter;
s12, according to the acquired calibration data, enabling the MCU software to segment the measured error curve of the whole current to form a plurality of phase compensation areas, and performing error correction processing on each phase compensation area to generate a processing result;
s13, generating a calibration table parameter corresponding to each phase compensation area according to the error correction processing result;
and S14, writing the calibration parameters into the metering chip to complete the calibration.
In this embodiment, step S11 is preceded by:
and S10, initializing a phase compensation area in the metering chip.
Specifically, the phase compensation area in the metering chip is set to 0, i.e., not segmented, and the phase correction register values of the areas 0 to 4 write the same correction value.
The voltage metering parameter, the current metering parameter and the power metering parameter in a register of the electric energy meter metering chip can be restored to initial values through initialization operation, wherein the initial values of the voltage metering parameter and the current metering parameter are both 0.
The metering chip is a core device of the electric energy meter, and is related to the product quality such as the metering accuracy, the working reliability and the stability of the electric energy meter.
In step S11, calibration data of the electric energy meter is acquired.
After the initialization operation is completed, meter calibration data of the electric energy meter are obtained, wherein the meter calibration data comprise a power gain value and a phase correction value; in this embodiment, the power gain value is set to the calibration register of each corresponding phase, and the phase correction value is set to the calibration register of each corresponding phase.
In step S12, according to the obtained calibration table data, the MCU software segments the measured error curve of the whole current to form a plurality of phase compensation regions, and performs error correction processing on each phase compensation region to generate a processing result.
Wherein, the whole current is segmented by MCU software; the error correction processing for each phase compensation region is processed by MCU software.
The error correction is to select a proper phase correction value of the correction point current in the same phase compensation area through MCU software as a correction value of the phase compensation area.
In the phase correction value of the current of the proper correction point in each section of error phase compensation area, the current of the proper correction point refers to the current of the middle point in the phase compensation area, and the correction point is far away from the section point, so that error jitter is avoided.
Specifically, as shown In fig. 2, according to an actual error characteristic curve (error-current, current range is 0.2In — Imax) of the current transformer, a multi-segment linear segmentation process is performed on the curve to form a plurality of phase compensation regions, a phase correction value of a current at an appropriate correction point is selected In the same segment of error phase compensation region as a correction value In the phase compensation region, and both the segmentation mechanism and the correction value are analyzed and processed In MCU software.
The current transformer is used for protecting, measuring and other loops, and is used for converting strong electric signals in electric equipment into secondary weak current signals. The 10% error curve is used as an important characteristic parameter, and the restriction relation between the primary current and the secondary load can be intuitively reflected.
In the embodiment, the selection of multi-section linearity in the characteristic curve of the current transformer is realized through MCU software to calibrate the meter, so that the metering accuracy is improved.
In step S13, a calibration table parameter for each phase compensation area is generated based on the error correction processing result.
After the error correction processing, that is, the MCU software selects the phase correction value of the correct point current in the same phase compensation area as the correction value in the phase compensation area, in this embodiment, each phase compensation area needs to be processed by the error correction processing to generate the calibration parameters of each phase compensation area.
In this embodiment, the calibration parameters refer to the phase compensation area and the phase calibration value in the phase compensation area.
Before step S14, the method further includes the steps of:
and the MCU software stores the calibration parameters in a memory.
Wherein, the memory is EEPROM.
Specifically, the obtained calibration parameters of each phase compensation area are stored in an EEPROM.
Before step S14, the method further includes the steps of:
the MCU software reads the current value of the electric energy meter in real time;
specifically, after the electric energy meter is powered on, the electric energy meter starts to operate, and at the moment, the MCU software reads the current value of the electric energy meter in real time.
Judging a phase compensation area where the current corresponding to the current value is located by the MCU software according to the read current value;
specifically, the MCU software determines which region the current corresponding to the current value is in according to the read current value, and determines the phase compensation region where the current is located.
And reading the calibration table parameters corresponding to the phase compensation area in the memory by the MCU software.
Specifically, after the phase compensation area corresponding to the current value read to the electric energy meter is determined, the calibration parameters corresponding to the phase compensation area stored in the EEPROM are read.
In the embodiment, the phase correction in the chip is not segmented, the MCU software is more flexibly segmented, and the calibration parameters can be changed in the EEPROM.
In step S14, the calibration parameters are written into the metrology chip to complete the calibration.
Specifically, the calibration parameters corresponding to the current phase compensation area read from the EEPROM are written into the metering chip, and the calibration of the electric energy meter is completed.
Compared with the prior art, the invention has the following advantages:
1. the selection of the multiple linear sections improves the precision of error compensation, so that the metering precision is improved in the actual operation.
2. The actual error characteristic curve of the current transformer can be segmented into a plurality of sections according to different precision requirements, and the calibration method can be applied to the three-phase electric energy meter with the higher precision requirement of 0.5S or 0.2S level.
3. The current can be judged in real time according to the read current to select a compensation value, and the compensation value is written into the metering chip. The real-time performance is enhanced, and the precision is improved.
4. The MCU software is flexibly led to realize segmentation according to the actual situation, and the calibration parameters can be changed in the EEPROM.
Example two
An electric energy meter calibration system based on MCU software of this embodiment, as shown in fig. 3, includes:
the acquisition module 11 is used for acquiring meter calibration data of the electric energy meter;
the segmentation module 12 is configured to segment the error curve of the measured whole current by the MCU software according to the obtained calibration data to form a plurality of phase compensation regions;
the processing module 13 is configured to perform error correction processing on each phase compensation area through MCU software to generate a processing result;
a generating module 14, configured to generate, through MCU software, a calibration table parameter corresponding to each phase compensation area for the error correction processing result;
and the correction module 15 is used for writing the calibration parameters into the metering chip through the MCU software to finish correction.
In this embodiment, the method further includes: and the initialization module is used for initializing the phase compensation area in the metering chip.
Specifically, the phase compensation area in the metering chip is set to 0, i.e., not segmented, and the phase correction register values of the areas 0 to 4 write the same correction value.
The voltage metering parameter, the current metering parameter and the power metering parameter in the register of the electric energy meter metering chip can be restored to initial values through initialization operation, wherein the initial values of the voltage metering parameter and the current metering parameter are 0.
The metering chip is a core device of the electric energy meter, and is related to the product quality such as the metering accuracy, the working reliability and the stability of the electric energy meter.
In the obtaining module 11, meter calibration data of the electric energy meter is obtained.
After the initialization operation is completed, meter calibration data of the electric energy meter are obtained, wherein the meter calibration data comprise a power gain value and a phase correction value; in this embodiment, the power gain value is set to the calibration register of each corresponding phase, and the phase correction value is set to the calibration register of each corresponding phase.
In the segmentation module 12, according to the acquired calibration data, the MCU software segments the measured error curve of the whole current to form a plurality of phase compensation regions.
Wherein, the whole current is segmented by MCU software.
Specifically, as shown In fig. 2, according to an actual error characteristic curve (error-current, current range is 0.2In — Imax) of the current transformer, a multi-stage linear piecewise processing is performed on the curve to form a plurality of phase compensation regions. The segmentation mechanism is realized by analyzing and processing in MCU software.
The current transformer is used for protecting, measuring and other loops, and is used for converting strong electric signals in electric equipment into weak current signals for secondary use. The 10% error curve is used as an important characteristic parameter, and the restriction relation between the primary current and the secondary load can be intuitively reflected.
In the embodiment, the selection of multi-section linearity in the characteristic curve of the current transformer is realized through MCU software to calibrate the meter, so that the metering accuracy is improved.
In the processing module 13, error correction processing is performed on each phase compensation region by MCU software, and a processing result is generated.
Wherein, the error correction processing for each phase compensation area is processed by MCU software.
The error correction is to select a proper phase correction value of the correction point current in the same phase compensation area through MCU software as a correction value of the phase compensation area.
In the phase correction value of the current of the proper correction point in each section of error phase compensation area, the current of the proper correction point refers to the current of the middle point in the phase compensation area, and the correction point is far away from the section point, so that error jitter is avoided.
Specifically, according to the generated plurality of phase compensation areas, a phase correction value of the current of a proper correction point is selected in the same-segment error phase compensation area as a correction value in the phase compensation area, and the correction value is analyzed and processed in MCU software.
In the generating module 14, the MCU software generates a calibration table parameter corresponding to each phase compensation area according to the error correction processing result.
After the error correction processing, that is, the MCU software selects the phase correction value of the correct point current in the same phase compensation area as the correction value in the phase compensation area, each phase compensation area in this embodiment needs to go through the error correction processing to generate the calibration parameters of each phase compensation area.
In this embodiment, the calibration parameters refer to the phase compensation area and the phase calibration value in the phase compensation area.
In this embodiment, the device further includes a storage module 15, configured to store the calibration parameters in a memory through MCU software.
Wherein, the memory is EEPROM.
Specifically, the obtained calibration parameters of each phase compensation area are stored in an EEPROM.
In this embodiment, the electric energy meter further comprises a first reading module, which is used for reading the current value of the electric energy meter in real time through the MCU software;
specifically, after the electric energy meter is powered on, the electric energy meter starts to operate, and at the moment, the MCU software reads the current value of the electric energy meter in real time.
The judging module is used for judging a phase compensation area where the current corresponding to the current value is located according to the read current value through MCU software;
specifically, the MCU software determines which region the current corresponding to the current value is in according to the read current value, and determines the phase compensation region where the current is located.
And the second reading module is used for reading the calibration parameters corresponding to the phase compensation area in the memory by the MCU software.
Specifically, after the phase compensation area corresponding to the current value read to the electric energy meter is determined, the calibration parameters corresponding to the phase compensation area stored in the EEPROM are read.
In the embodiment, the phase correction in the chip is not segmented, the MCU software is more flexibly segmented, and the calibration parameters can be changed in the EEPROM.
In the correction module 15, the MCU software writes the calibration parameters into the metering chip to complete the correction.
Specifically, the calibration parameters corresponding to the current phase compensation area read from the EEPROM are written into the metering chip, and the calibration of the electric energy meter is completed.
The specific implementation manner of the electric energy meter correction system based on the MCU software of this embodiment is as follows:
according to the actual error characteristic curve of the current transformer, multi-section linear segmentation processing is carried out on the curve to obtain a plurality of phase compensation areas, the phase correction value of the current of a proper correction point is selected in the same section of error phase compensation area to be used as the correction value in the phase compensation area, each phase compensation area forms meter correction parameters corresponding to each phase compensation area after error correction, the segmentation mechanism and the correction value are analyzed, processed and realized in MCU software, and the meter correction parameters corresponding to each phase compensation area are all stored in an EEPROM. When the electric meter runs, the MCU software reads the current value of the electric energy meter in real time, after the current is read, the current corresponding to the current value is judged in which phase compensation area, and then the meter calibration parameters corresponding to the phase compensation area are read from the EEPROM and written into the metering chip, so that the electric energy meter is calibrated.
Compared with the prior art, the invention has the following advantages:
1. the selection of the multiple linear sections improves the precision of error compensation, so that the metering precision is improved in the actual operation.
2. The actual error characteristic curve of the current transformer can be segmented into a plurality of sections according to the current value according to different precision requirements, and the method for realizing calibration can be applied to 0.5S or 0.2S three-phase electric energy meters with higher precision requirements.
3. The current can be judged in real time according to the read current to select a compensation value, and the compensation value is written into the metering chip. The real-time performance is enhanced, and the precision is improved.
4. The MCU software is flexibly led to realize segmentation according to the actual situation, and the calibration parameters can be changed in the EEPROM.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. An electric energy meter correction method based on MCU software is characterized by comprising the following steps:
s1, obtaining meter calibration data of an electric energy meter;
s2, according to the acquired meter calibration data, enabling the MCU software to segment the error curve of the whole measured current to form a plurality of phase compensation areas, and performing error correction processing on each phase compensation area to generate a processing result;
s3, generating a calibration parameter corresponding to each phase compensation area according to the error correction processing result;
s4, writing the calibration parameters into a metering chip to complete calibration;
the error correction in the step S2 is to select a suitable phase correction value of the correction point current in the same phase compensation region as the correction value of the phase compensation region through MCU software;
the step S4 is preceded by:
the MCU software reads the current value of the electric energy meter in real time;
judging a phase compensation area where the current corresponding to the current value is located by the MCU software according to the read current value;
MCU software reads the calibration table parameter corresponding to the phase compensation area in the memory;
the appropriate correction point current is the current at the midpoint of the phase compensation region;
according to the actual error characteristic curve of the current transformer, multi-section linear segmentation processing is carried out on the curve to form a plurality of phase compensation areas, a phase correction value of current of a proper correction point is selected in the same section of error phase compensation area to serve as a correction value in the phase compensation area, and a segmentation mechanism and the correction value are analyzed and processed in MCU software.
2. The electric energy meter correction method based on MCU software according to claim 1, characterized in that said step S4 is preceded by the following steps:
and the MCU software stores the calibration parameters in a memory.
3. The electric energy meter correction method based on MCU software according to claim 1 or 2, characterized in that, before said step S1, further comprising:
s0. initialize the phase compensation region in the metrology chip.
4. The electric energy meter correction method based on the MCU software according to claim 1, wherein the meter correction data in step S1 comprises power gain values, phase correction values; the step S1 specifically includes setting the power gain value to the calibration register of each corresponding phase; and setting the phase correction value to the calibration register of each corresponding phase.
5. An electric energy meter correction system based on MCU software, characterized by comprising:
the acquisition module is used for acquiring meter calibration data of the electric energy meter;
the segmentation module is used for segmenting the error curve of the whole current obtained by measurement by the MCU software according to the obtained calibration data to form a plurality of phase compensation areas;
the processing module is used for carrying out error correction processing on each phase compensation area through MCU software to generate a processing result;
the generating module is used for generating a calibration table parameter corresponding to each phase compensation area for the error correction processing result through MCU software;
the correction module is used for writing the calibration parameters into the metering chip through MCU software to finish correction;
in the error correction, the phase correction value of the current of a proper correction point is selected in the same phase compensation area through MCU software to be used as the correction value of the phase compensation area;
further comprising:
the first reading module is used for reading the current value of the electric energy meter in real time through MCU software;
the judging module is used for judging a phase compensation area where the current corresponding to the current value is located according to the read current value through MCU software;
the second reading module is used for reading the calibration table parameters corresponding to the phase compensation area in the memory through MCU software;
a suitable correction point current is the current in the middle of the phase compensation zone;
according to the actual error characteristic curve of the current transformer, the curve is subjected to multi-section linear segmentation processing to form a plurality of phase compensation areas, a phase correction value of the current of a proper correction point is selected in the same-section error phase compensation area to serve as a correction value in the phase compensation area, and a segmentation mechanism and the correction value are analyzed and processed in MCU software.
6. The electric energy meter correction system based on MCU software according to claim 5, characterized by further comprising:
and the storage module is used for storing the calibration table parameters in a memory through MCU software.
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| CN111812445B (en) * | 2020-09-14 | 2020-12-08 | 杭州炬华科技股份有限公司 | Intelligent capacitor error correction method and device, computer equipment and storage medium |
| CN112285635B (en) * | 2020-12-29 | 2021-04-20 | 武汉中原电子信息有限公司 | Terminal correction method and system of external current transformer |
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| CN102338865B (en) * | 2011-06-17 | 2013-11-06 | 杭州炬华科技股份有限公司 | Method for quickly calibrating error of three-phase intelligent electric energy meter |
| CN102520226B (en) * | 2011-12-06 | 2014-08-13 | 广东电网公司电力科学研究院 | Low current compensation method for electric energy measurement |
| CN102590784B (en) * | 2012-03-14 | 2014-08-13 | 沈阳时尚实业有限公司 | Single-phase intelligent energy meter distributed correction method |
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| CN105911506A (en) * | 2016-04-18 | 2016-08-31 | 青岛高科通信股份有限公司 | Correction method of electric energy meter and equipment |
| CN106842105B (en) * | 2017-02-14 | 2019-05-07 | 珠海中慧微电子股份有限公司 | A method of reducing electric energy metering error |
| CN109061290B (en) * | 2018-10-12 | 2024-02-20 | 山东计保电气有限公司 | High-precision compensation system and compensation method for high-voltage electric energy metering device |
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