CN112363001A - High-precision metering method and system for platform area intelligent fusion terminal - Google Patents
High-precision metering method and system for platform area intelligent fusion terminal Download PDFInfo
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- CN112363001A CN112363001A CN202011330648.7A CN202011330648A CN112363001A CN 112363001 A CN112363001 A CN 112363001A CN 202011330648 A CN202011330648 A CN 202011330648A CN 112363001 A CN112363001 A CN 112363001A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a high-precision metering method and system for an intelligent platform area fusion terminal, which belong to the technical field of distribution Internet of things and comprise a master control MCU (microprogrammed control unit), a metering chip and a storage chip, wherein the master control MCU is connected with the metering chip through an SPI (serial peripheral interface) bus, the output of the master control MCU is connected with the storage chip, the metering chip is provided with an electric energy pulse interface, and the metering chip is used for collecting electric quantity data and sending the electric quantity data to the master control MCU; the main control MCU is used for acquiring electrical quantity data, metering the electrical quantity data, and correcting the metering precision to obtain a precision-corrected multi-gear coefficient and a correction log; the storage chip is used for storing the multi-gear coefficient and the correction log of the multi-precision correction; and the precision correction of the metering by the main control MCU comprises ADC gain correction and current effective value correction. The invention can realize high-precision metering of the intelligent fusion terminal in the transformer area, and can meet the high-precision metering requirement of new marketing and distribution services by considering the design from the aspects of metering precision range, temperature environment influence, small signal external interference and the like.
Description
Technical Field
The invention relates to the technical field of distribution internet of things, in particular to a high-precision metering method and system for an intelligent platform area fusion terminal.
Background
The intelligent platform region fusion terminal is an edge agent device integrating power distribution and power distribution information acquisition and is core equipment of a low-voltage power distribution internet of things. Compared with the traditional platform area intelligent terminal, the biggest difference is to have the business application that supports marketing, need rationalize and utilize equipment resource, promote customer service level.
The application requirement of the marketing service is realized, and the metering precision of the intelligent convergence terminal of the platform area must be improved. The existing intelligent distribution transformer terminal can meet the requirements of acquisition and calculation of basic data such as voltage, current, harmonic waves and the like, but still has some problems to be solved, such as small measurement precision range, large measurement precision error in a higher or lower temperature environment, and incapability of realizing high-level functions such as electric energy pulse output, current starting, current shunt running and the like.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and improve the metering precision of the intelligent fusion terminal in the transformer area.
In order to achieve the above object, the present invention provides a high-precision metering method for an intelligent platform area convergence terminal, comprising:
place district intelligence fusion terminal respectively in different temperature environment to rectify in every temperature environment, include:
s1, receiving a correction instruction, wherein the content of the correction instruction comprises a correction gear and a theoretical value of an electric quantity;
s2, collecting electric quantity data, and calculating a correction coefficient of ADC gain according to the average value of the currently collected electric quantity actual data and the theoretical value of the electric quantity;
s3, acquiring the current operating environment temperature value, and storing the correction coefficient and the correction log of a certain gear at the current environment temperature;
s4, updating the ADC gain correction coefficient according to the correction coefficient of a certain gear under the current environment temperature;
s5, switching the correction gear position, and repeatedly executing the steps S1-S4.
Further, the platform area intelligent fusion terminal is respectively placed in different temperature environments, specifically, the platform area intelligent fusion terminal is respectively placed in normal temperature, low temperature and high temperature environments.
Further, the low temperature range is less than minus 5 ℃, and the normal temperature range is minus 5 ℃ to 55 ℃; the high temperature range is greater than 55 ℃.
Further, the correction gear comprises rated currents of three gears, namely a voltage gear 220V, a phase gear 0.5L and a current gear 5%, rated currents of a voltage gear 220V, a phase gear 0.5L and a current gear 100%, and rated currents of a voltage gear 220V, a phase gear 0.5L and a current gear 120%.
Further, still include:
the correction of the effective value of the current is carried out under the condition that the precision measurement of 0.1 percent rated current and the input no-load of a current channel are met.
Further, the collected electrical quantity data includes voltage, current, active power, reactive power, power factor, phase angle and grid frequency.
Further, still include:
and respectively calculating the total distortion rate of the voltage, the total distortion rate of the current, the multiple harmonic content and the amplitude data of the voltage and the current data obtained by sampling, thereby realizing the monitoring of the power quality.
On the other hand, adopt a high accuracy measurement system of district intelligence fusion terminal, including master control MCU, measurement chip and memory chip, master control MCU passes through the SPI bus and is connected with measurement chip, master control MCU output is connected with memory chip, measurement chip possesses the electric energy pulse interface, wherein:
the metering chip is used for collecting electrical quantity data and sending the electrical quantity data to the master control MCU;
the main control MCU is used for acquiring electrical quantity data, metering the electrical quantity data, and correcting the metering precision to obtain a precision-corrected multi-gear coefficient and a correction log;
the storage chip is used for storing multi-gear coefficients and correction logs of multi-precision correction;
the main control MCU carries out the precision correction of measurement including the correction of ADC gain correction and electric current virtual value, the correction of ADC gain is for placing platform district intelligent fusion terminal respectively in different temperature environment to rectify in every temperature environment, include:
s1, receiving a correction instruction, wherein the content of the correction instruction comprises a correction gear and a theoretical value of an electric quantity;
s2, collecting electric quantity data, and calculating a correction coefficient of ADC gain according to the average value of the currently collected electric quantity actual data and the theoretical value of the electric quantity;
s3, acquiring the current operating environment temperature value, and storing a correction coefficient and a correction log of a certain gear at the current environment temperature into a data area of a memory chip and a main control MCU (microprogrammed control unit);
s4, the master control MCU updates the value of the ADC gain correction coefficient register of the metering chip;
s5, switching the correction gear position, and repeatedly executing the steps S1-S4.
Further, the transformer area intelligent fusion terminals are respectively placed in different temperature environments, specifically, the transformer area intelligent fusion terminals are respectively placed in the environments with the normal temperature of 10-30 ℃, the low temperature of-40 ℃ and the high temperature of 70 ℃.
Further, the main control MCU correcting the current effective value includes:
the correction of the effective value of the current is carried out under the condition that the precision measurement of 0.1 percent rated current and the input no-load of a current channel are met.
Compared with the prior art, the invention has the following technical effects: the precision metering method of the intelligent transformer area fusion terminal provided by the invention respectively corrects the metering precision under various temperature environments, so that the intelligent transformer area fusion terminal can meet the metering precision requirement when running under a complex temperature environment, and the metering precision requirement of measurement in a wider range can be met by arranging a plurality of correction gears. And the change of the temperature gear can be monitored in real time in the metering process, the ADC gain correction coefficient of the metering chip is updated in real time, and the metering precision is ensured to be always in a higher precision level.
Drawings
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
FIG. 1 is a flow chart of ADC gain correction;
fig. 2 is a structural diagram of a high-precision metering system of a platform intelligent convergence terminal.
Detailed Description
To further illustrate the features of the present invention, refer to the following detailed description of the invention and the accompanying drawings. The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure.
As shown in fig. 1, this embodiment discloses a high-precision metering method for a transformer area intelligent fusion terminal, which places the transformer area intelligent fusion terminal in different temperature environments respectively, and corrects the transformer area intelligent fusion terminal in each temperature environment, and includes the following steps:
s1, receiving a correction instruction, wherein the content of the correction instruction comprises a correction gear and a theoretical value of an electric quantity;
s2, collecting electric quantity data, and calculating a correction coefficient of ADC gain according to the average value of the currently collected electric quantity actual data and the theoretical value of the electric quantity;
s3, acquiring the current operating environment temperature value, and storing the correction coefficient and the correction log of a certain gear at the current environment temperature;
s4, updating the ADC gain correction coefficient according to the correction coefficient of a certain gear under the current environment temperature;
s5, switching the correction gear position, and repeatedly executing the steps S1-S4.
It should be noted that, the specific calculation process of the correction coefficient of the ADC gain is as follows:
taking voltage UA channel as an example, assume that the effective value UA of the front a-phase voltage is correctedBefore schoolAfter correction UaAfter school(actual value of a-phase voltage included in the correction command), and the relationship between them:
Uaafter school＝UaBefore school+UaBefore school×Gain
Wherein, Gain represents the precision error coefficient, not the ADC Gain correction coefficient, i.e. the ADC Gain register value RegGain, is a signed number of 2 bytes, and the most significant bit is the sign bit.
Wherein, the correction formula is:
if RegGain is greater than or equal to 215Then Gain is equal to (RegGain-2)16)/215Otherwise Gain is equal to RegGain/215。
As a further preferable aspect, the correction coefficient switching step is performed according to the following three temperature ranges: low temperature range: less than-5 ℃; normal temperature range: -5 ℃ to 55 ℃; high temperature range: greater than 55 ℃.
Preferably, since the terminal operates in an ambient temperature range of-40 ℃ to 70 ℃, the terminal is calibrated in an environment of high temperature 70 ℃ and low temperature-40 ℃, which are edge limit temperatures. Considering the environmental temperature of product production, the normal temperature is within 10-30 ℃.
As a further preferable mode, in order to improve the measurement range of the metering accuracy, the correction gear is divided into three correction gears, the first gear is rated current of a voltage gear 220V, a phase gear 0.5L and a current gear 5%, the second gear is rated current of a voltage gear 220V, a phase gear 0.5L and a current gear 100%, and the third gear is rated current of a voltage gear 220V, a phase gear 0.5L and a current gear 120%.
As a further preferable scheme, the method further comprises the step of correcting the effective value of the current, specifically:
the correction of the effective value of the current is carried out under the condition that the precision measurement of 0.1 percent rated current and the input no-load of a current channel are met.
It should be noted that, taking the correction of the effective value of the a current as an example, the calculation process of the IA _ OS register is as follows:
(1) configuring a standard source to enable the output voltage to be equal to the rated voltage 220V, and enabling the current channel to be unloaded;
(2) the master control MCU reads the register value of the IA for temporary storage;
(3) repeating the step (2), reading the value of the IA register 10 times at intervals of 200ms, and calculating an average value IAave;
(4) squaring IAave of IAave2The binary complement is obtained from bits 14-29, and the binary complement is filled into IA _ OS registers bit 14-bit 0, and sign bit1 is filled into IA _ OS register bit 15.
(5) And finishing the correction of the effective value of the A-phase current.
And (5) correcting the effective current values of other phases, and repeating the steps (1) to (5).
It should be noted that, in order to realize the application functions of starting and creeping, the precision measurement of 0.1% rated current must be satisfied to reduce the electric energy line loss; the influence of external noise of a circuit board of the metering system on a small current signal is reduced, the current effective value is corrected under the condition that a current channel is input to be unloaded, the calculated current effective value correction coefficient is written into a memory and an MCU data storage area, and different temperature environments are not needed to be distinguished in the correction.
As a further preferred scheme, the collected electrical quantity data includes voltage, current, active power, reactive power, power factor, phase angle and grid frequency.
As a further preferable aspect, the method further includes:
and respectively calculating the total distortion rate of the voltage, the total distortion rate of the current, the multiple harmonic content and the amplitude data of the voltage and the current data obtained by sampling, thereby realizing the monitoring of the power quality.
As shown in fig. 2, this embodiment discloses a high-precision metering system of platform district intelligent fusion terminal, including main control MCU, measurement chip and memory chip, main control MCU passes through the SPI bus and is connected with measurement chip, main control MCU output is connected with memory chip, measurement chip possesses electric energy pulse interface, wherein:
the metering chip is used for collecting electrical quantity data and sending the electrical quantity data to the master control MCU;
the main control MCU is used for acquiring electrical quantity data, metering the electrical quantity data, and correcting the metering precision to obtain a precision-corrected multi-gear coefficient and a correction log;
the storage chip is used for storing multi-gear coefficients and correction logs of multi-precision correction;
and the precision correction of the metering by the main control MCU comprises ADC gain correction and current effective value correction.
It should be noted that the main control MCU chip is a 32-bit real-time embedded chip, and interacts data with the metering chip by using an SPI bus, so that the metering chip can flexibly adjust configuration parameters of a register, and read data from the metering chip to perform arithmetic processing to realize metering of different electrical quantity data.
The metering chip meets the requirement of 0.5S-level active electric energy precision, is capable of collecting external three-phase voltage (UA, UB and UC) and four-phase current (IA, IB, IC and IN), automatically calculating data such as active power, reactive power, voltage and current effective values, power factors, power grid frequency and waveform cache, externally outputting active and reactive electric energy pulse interfaces, has functions of shunt running and starting, provides 7-path ADC channel gain correction and current effective value correction, and has abundant and flexible register configuration parameters.
The metering chip is provided with an active and reactive electric energy pulse interface for external output, can realize higher electric energy precision level, and is convenient for detecting the metering precision of the intelligent integrated terminal in a transformer area.
The memory chip adopts a ferroelectric memory FRAM, has a nonvolatile data storage characteristic, is safe and reliable in data storage, and is used for storing a multi-gear coefficient and a correction log for metering precision correction.
As a further preferable scheme, the transformer area intelligent fusion terminals are respectively placed in different temperature environments, specifically, the transformer area intelligent fusion terminals are respectively placed in the environments with the normal temperature of 10-30 ℃, the low temperature of-40 ℃ and the high temperature of 70 ℃.
As a further preferable scheme, the MCU main control chip has functions of data acquisition, electrical quantity calculation, start/shunt running, precision correction, and the like, wherein the data acquisition function is used to acquire data such as voltage, current, active power, reactive power, power factor, phase angle, grid frequency, and the like, and to perform statistics and analysis of electrical quantity data.
The electric quantity calculation function is used for calculating the total distortion rate and multiple harmonic content or amplitude data of the voltage and the current of the sampled voltage and current waveform data to realize the monitoring of the power quality
The starting and shunt running functions are realized by setting a threshold with 0.1% of rated current, and the electric energy line loss is reduced.
The metering precision correction comprises ADC gain correction and current effective value correction.
Wherein, the correction of ADC gain is to place platform district intelligence fusion terminal respectively in different temperature environment to rectify in every temperature environment, include:
s1, receiving a correction instruction, wherein the content of the correction instruction comprises a correction gear and a theoretical value of an electric quantity;
s2, collecting electric quantity data, and calculating a correction coefficient of ADC gain according to the average value of the currently collected electric quantity actual data and the theoretical value of the electric quantity;
s3, acquiring the current operating environment temperature value, and storing a correction coefficient and a correction log of a certain gear at the current environment temperature into a data area of a memory chip and a main control MCU (microprogrammed control unit);
s4, the master control MCU updates the value of the ADC gain correction coefficient register of the metering chip;
s5, switching the correction gear position, and repeatedly executing the steps S1-S4.
As a further preferable scheme, the transformer area intelligent fusion terminals are respectively placed in different temperature environments, specifically, the transformer area intelligent fusion terminals are respectively placed in the environments with the normal temperature of 10-30 ℃, the low temperature of-40 ℃ and the high temperature of 70 ℃.
As a further preferable scheme, the correcting the effective value of the current by the main control MCU includes:
the correction of the effective value of the current is carried out under the condition that the precision measurement of 0.1 percent rated current and the input no-load of a current channel are met.
It should be noted that, the hardware of this embodiment adopts an architecture scheme of "main control MCU chip + metering chip + storage chip", and the hardware is characterized in that the collection and processing of the service data of the metering system can be performed in real time and efficiently, which not only satisfies the collection and calculation functions of basic data of electrical quantity, but also satisfies the functions of starting, creeping, and outputting pulse of electrical energy, and especially satisfies the requirement of higher metering accuracy.
The metering precision is corrected, the metering precision is divided into low temperature, normal temperature and high temperature according to different temperature range values, and the metering precision is corrected under three different temperature environments respectively, so that the intelligent fusion terminal in the transformer area can meet the requirement of the metering precision under the complex temperature environment; and the metering precision is corrected according to three gears of 5%, 100% and 120% of rated current according to current gears, so that the metering precision requirement of wider-range measurement is met.
During the normal operation of the metering system, the change of the temperature gear can be monitored in real time, the ADC gain correction coefficient of the metering chip is updated in real time, and the metering precision is ensured to be in a higher precision level all the time.
The correction coefficient of the metering precision is stored in the data storage area of the storage chip and the main control MCU, so that double backup of the correction coefficient is realized, if any component of the main control MCU, the storage chip and the metering chip is replaced, precision correction does not need to be carried out on metering again, and great convenience is brought to equipment maintenance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a high accuracy metering method of district intelligent fusion terminal which characterized in that, places district intelligent fusion terminal respectively in different temperature environment to rectify in every temperature environment, includes:
s1, receiving a correction instruction, wherein the content of the correction instruction comprises a correction gear and a theoretical value of an electric quantity;
s2, collecting electric quantity data, and calculating a correction coefficient of ADC gain according to the average value of the currently collected electric quantity actual data and the theoretical value of the electric quantity;
s3, acquiring the current operating environment temperature value, and storing the correction coefficient and the correction log of a certain gear at the current environment temperature;
s4, updating the ADC gain correction coefficient according to the correction coefficient of a certain gear under the current environment temperature;
s5, switching the correction gear position, and repeatedly executing the steps S1-S4.
2. The high-precision metering method for the intelligent convergence terminal of the transformer district as claimed in claim 1, wherein the intelligent convergence terminal of the transformer district is respectively placed in different temperature environments, in particular, normal temperature, low temperature and high temperature environments.
3. The high-precision metering method of the platform area intelligent fusion terminal according to claim 2, wherein the low-temperature range is less than-5 ℃ and the normal-temperature range is-5 ℃ to 55 ℃; the high temperature range is greater than 55 ℃.
4. The high-precision metering method of the platform intelligent convergence terminal according to claim 1, wherein the correction gear comprises three gears, namely rated currents of 220V in voltage gear, 0.5L in phase gear and 5% in current gear, rated currents of 220V in voltage gear, 0.5L in phase gear and 100% in current gear, and rated currents of 220V in voltage gear, 0.5L in phase gear and 120% in current gear.
5. The high-precision metering method of the platform intelligent convergence terminal according to claim 1, further comprising:
the correction of the effective value of the current is carried out under the condition that the precision measurement of 0.1 percent rated current and the input no-load of a current channel are met.
6. The method for high-precision metering of the area intelligent convergence terminal of claim 1, wherein the collected electrical quantity data comprises voltage, current, active power, reactive power, power factor, phase angle and grid frequency.
7. The high-precision metering method of the platform intelligent convergence terminal according to claim 6, further comprising:
and respectively calculating the total distortion rate of the voltage, the total distortion rate of the current, the multiple harmonic content and the amplitude data of the voltage and the current data obtained by sampling, thereby realizing the monitoring of the power quality.
8. The utility model provides a high accuracy measurement system at platform district intelligence fusion terminal which characterized in that, includes main control MCU, measurement chip and memory chip, main control MCU passes through the SPI bus and is connected with measurement chip, main control MCU output is connected with memory chip, measurement chip possesses electric energy pulse interface, wherein:
the metering chip is used for collecting electrical quantity data and sending the electrical quantity data to the master control MCU;
the main control MCU is used for acquiring electrical quantity data, metering the electrical quantity data, and correcting the metering precision to obtain a precision-corrected multi-gear coefficient and a correction log;
the storage chip is used for storing multi-gear coefficients and correction logs of multi-precision correction;
the main control MCU carries out the precision correction of measurement including the correction of ADC gain correction and electric current virtual value, the correction of ADC gain is for placing platform district intelligent fusion terminal respectively in different temperature environment to rectify in every temperature environment, include:
s1, receiving a correction instruction, wherein the content of the correction instruction comprises a correction gear and a theoretical value of an electric quantity;
s2, collecting electric quantity data, and calculating a correction coefficient of ADC gain according to the average value of the currently collected electric quantity actual data and the theoretical value of the electric quantity;
s3, acquiring the current operating environment temperature value, and storing a correction coefficient and a correction log of a certain gear at the current environment temperature into a data area of a memory chip and a main control MCU (microprogrammed control unit);
s4, the master control MCU updates the value of the ADC gain correction coefficient register of the metering chip;
s5, switching the correction gear position, and repeatedly executing the steps S1-S4.
9. The high-precision metering system of the intelligent convergence terminal of the transformer district as claimed in claim 8, wherein the intelligent convergence terminal of the transformer district is respectively placed in different temperature environments, specifically, the intelligent convergence terminal of the transformer district is respectively placed in the environments of normal temperature 10-30 ℃, low temperature-40 ℃ and high temperature 70 ℃.
10. The high-precision metering system of the intelligent convergence terminal in the transformer area according to claim 8, wherein the main control MCU corrects the effective current value by:
the correction of the effective value of the current is carried out under the condition that the precision measurement of 0.1 percent rated current and the input no-load of a current channel are met.
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