CN112213557A - Direct-current metering method for electric energy meter - Google Patents
Direct-current metering method for electric energy meter Download PDFInfo
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- CN112213557A CN112213557A CN201911326889.1A CN201911326889A CN112213557A CN 112213557 A CN112213557 A CN 112213557A CN 201911326889 A CN201911326889 A CN 201911326889A CN 112213557 A CN112213557 A CN 112213557A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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Abstract
The invention relates to a direct current metering method of an electric energy meter, which comprises the following steps: s1, initializing variables required by operation; s2, acquiring voltage and current sampling value data (U, I) of a sampling time point; s3, performing low-pass filtering on the (U, I) respectively; s4, eliminating direct current bias on the (U, I); s5, performing accumulation calculation; and S6, judging the accumulation times, if the COUNTER > is COUNTER _ TH (wherein the COUNTER _ TH is a preset accumulation time threshold value), calculating voltage, current and power values, and otherwise, skipping to the step S2 to continue execution. The calculation formula of the voltage, the current and the power value is as follows: v mean V sum counter V factor; i _ mean/counter I _ factor; p _ sum/counter P _ factor. Wherein, V _ mean is the voltage value of the calculation output, I _ mean is the current value of the calculation output, P is the power value of the calculation output, and V _ factor, I _ factor and P _ factor can be obtained by a calibration method. The method is characterized in that the method is carried out in real time along with sampling, and has the characteristic of saving calculation time.
Description
Technical Field
The invention relates to the field of intelligent electric energy meters and electric energy metering, in particular to a direct current electric energy metering method.
Background
At present, solar power generation, electric vehicles and the like are more and more widely applied, and in a solar power station, the power generation output of a photovoltaic cell group is direct current; when charging an electric vehicle, dc power supply is often used, and therefore, in these cases of power supply and charging, it is necessary to measure the amount of output electric energy using a dc electric energy meter.
The existing direct current electric energy meter is mostly realized in a mode that a voltage and current sampling circuit converts input high voltage and large current into small signals and then inputs the small signals into a voltage and current sampling channel of an electric energy metering chip. The metering chip internally comprises a programmable operational amplifier PGA, an A/D converter, a digital multiplier, a digital low-pass filter, a digital high-pass filter, a digital integrator, a frequency converter, a communication interface and other functional modules. The special metering chip is responsible for realizing the metering function, and other functions of the electric meter are realized by another MCU chip, so that the mode has higher cost and larger occupied area.
The chip technology is rapidly developed at present, functions such as digital filtering, integration and the like which are realized by special hardware in the past can be realized on a general MCU through software, and if the MCU has a relatively accurate ADC or is matched with a proper ADC, the direct current metering function can be realized at a relatively low hardware cost.
Disclosure of Invention
The invention aims to provide a direct current electric energy metering method which is suitable for a digital electric energy meter and has the advantages of simple and convenient realization, small calculation amount and accurate metering. The device is characterized by being capable of operating on a direct current electric energy metering device, and the direct current electric energy metering device is provided with: the device comprises a voltage sampling circuit, a current sampling circuit and a data acquisition module data calculation module. The data acquisition module can be an analog-to-digital conversion circuit, the data calculation module can be a microprocessor chip, and the data acquisition module and the data calculation module can also be processor chips integrating the functions of the data acquisition module and the data calculation module.
The invention comprises the following steps:
s1, a variable V _ sum which is required by initialization operation is 0, I _ sum is 0, P _ sum is 0, and Counter is 0;
s2, acquiring voltage and current sampling value data (U, I) of a sampling time point;
s3, performing low-pass filtering on the (U, I) respectively;
s4, eliminating direct current bias on the (U, I);
s5, performing accumulation calculation;
and S6, judging the accumulation times, if the COUNTER > is COUNTER _ TH (wherein the COUNTER _ TH is a preset accumulation time threshold value), calculating voltage, current and power values, and otherwise, skipping to the step S2 to continue execution.
S7, calculating voltage, current and power values:
V_mean＝V_sum/counter*V_factor；
I_mean＝I_sum/counter*I_factor；
P＝P_sum/counter*P_factor。
wherein, V _ mean is the voltage value of the calculation output, I _ mean is the current value of the calculation output, P is the power value of the calculation output, and V _ factor, I _ factor and P _ factor can be obtained by a calibration method.
The method is characterized in that the method is a mode of comparing a large number of sampling points obtained at one time and then uniformly calculating along with the real-time sampling, and has the characteristics of fully utilizing time and saving calculation time.
The low-pass filtering method in the step 3 is characterized in that the digital low-pass filter can be realized by adopting IIR, FIR and other modes, and the amplitude-frequency characteristic can be determined according to the parameter requirements of the direct current electric energy metering device.
Drawings
FIG. 1 is a schematic view of the operation platform of the present invention.
FIG. 2 is a flow chart of the method of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific examples and the accompanying drawings.
As shown in fig. 1, a schematic diagram of an operation platform of the present invention is shown, where the operation platform is a dc power metering device, and the dc power metering device should include: the device comprises a voltage sampling circuit, a current sampling circuit and a data acquisition module data calculation module. The data acquisition module can be realized by an analog-to-digital conversion chip, and typical parameters are as follows: the data calculation module can be a microprocessor chip, and typical parameters are 32Mhz main frequency, 32k RAM and 256k ROM. The voltage sampling circuit is a resistance voltage division circuit, and the current sampling circuit is not a manganin sampling circuit.
The sampling rate of the system is 5000Hz, each sampling interval is 200us, the algorithm is deployed in the interrupt triggered by the successful acquisition of the sampling numerical value, and data calculation is carried out in real time along with the sampling.
As shown in fig. 2, for the execution of the algorithm deployed in the interrupt:
s1, a variable V _ sum which is required by initialization operation is 0, I _ sum is 0, P _ sum is 0, and Counter is 0;
s2, acquiring voltage and current sampling value data (U, I) of a sampling time point;
s3, performing low-pass filtering on the (U, I) respectively;
s4, eliminating direct current bias on the (U, I);
s5, performing accumulation calculation;
and S6, judging the accumulation times, if the COUNTER > is COUNTER _ TH (wherein the COUNTER _ TH is a preset accumulation time threshold value, a typical value of the COUNTER _ TH can be adjusted according to the sampling rate, 5000 is adopted in the specific implementation), calculating voltage, current and power values, and otherwise, skipping to the step S2 to continue execution.
S7, calculating voltage, current and power values:
V_mean＝V_sum/counter*V_factor；
I_mean＝I_sum/counter*I_factor；
P＝P_sum/counter*P_factor。
wherein, V _ mean is the voltage value of the calculation output, I _ mean is the current value of the calculation output, P is the power value of the calculation output, and V _ factor, I _ factor and P _ factor can be obtained by a calibration method.
The direct current meter adopting the algorithm has stronger anti-interference capability and higher precision after calibration, and the error can meet the requirement of 0.5S.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A direct current metering method of an electric energy meter is characterized by being capable of operating on a direct current electric energy metering device, wherein the direct current electric energy metering device is provided with: the device comprises a voltage sampling circuit, a current sampling circuit and a data acquisition module data calculation module. The data acquisition module can be an analog-to-digital conversion circuit, the data calculation module can be a microprocessor chip, and the data acquisition module and the data calculation module can also be processor chips integrating the functions of the data acquisition module and the data calculation module.
2. The direct current metering method of the electric energy meter according to claim 1, characterized by comprising the following steps:
s1, a variable V _ sum which is required by initialization operation is 0, I _ sum is 0, P _ sum is 0, and Counter is 0;
s2, acquiring voltage and current sampling value data (U, I) of a sampling time point;
s3, performing low-pass filtering on the (U, I) respectively;
s4, eliminating direct current bias on the (U, I);
s5, performing accumulation calculation;
and S6, judging the accumulation times, if the COUNTER > is COUNTER _ TH (wherein the COUNTER _ TH is a preset accumulation time threshold value), calculating voltage, current and power values, and otherwise, skipping to the step S2 to continue execution.
S7, calculating voltage, current and power values:
V_mean＝V_sum/counter*V_factor；
I_mean＝I_sum/counter*I_factor；
P＝P_sum/counter*P_factor。
wherein, V _ mean is the voltage value of the calculation output, I _ mean is the current value of the calculation output, P is the power value of the calculation output, and V _ factor, I _ factor and P _ factor can be obtained by a calibration method.
3. The direct current metering method of the electric energy meter, as claimed in claim 2, is characterized in that the method is a method of comparing a large number of sampling points obtained at one time and then uniformly calculating along with the sampling in real time, and has the characteristics of fully utilizing time and saving calculation time.
4. The low-pass filtering method in the step 3 as claimed in claim 2, wherein the digital low-pass filter can be implemented in IIR, FIR, etc., and the amplitude-frequency characteristic can be determined according to the parameter requirement of the dc power metering device.
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Cited By (2)
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| CN113777400A (en) * | 2021-11-11 | 2021-12-10 | 青岛鼎信通讯股份有限公司 | Software frequency conversion sampling metering method for standard electric energy meter |
| CN116760475A (en) * | 2023-08-18 | 2023-09-15 | 青岛鼎信通讯股份有限公司 | Infrared signal communication circuit and method of intelligent electric energy meter |
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| CN116760475A (en) * | 2023-08-18 | 2023-09-15 | 青岛鼎信通讯股份有限公司 | Infrared signal communication circuit and method of intelligent electric energy meter |
| CN116760475B (en) * | 2023-08-18 | 2023-12-08 | 青岛鼎信通讯股份有限公司 | Infrared signal communication circuit and method of intelligent electric energy meter |
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