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Standard electric energy meter software frequency conversion sampling metering method

A standard electric energy meter, frequency conversion sampling technology, applied in the direction of measuring electrical variables, measuring devices, instruments, etc., to achieve high-precision measurement, high measurement accuracy, and the effect of eliminating measurement errors

Inactive Publication Date: 2021-12-10
QINGDAO TOPSCOMM COMM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing standard table requires an accuracy of 0.05% in general, and it is difficult to achieve a maximum of 0.01%.

Method used

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  • Standard electric energy meter software frequency conversion sampling metering method
  • Standard electric energy meter software frequency conversion sampling metering method
  • Standard electric energy meter software frequency conversion sampling metering method

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Embodiment Construction

[0033] Hereinafter, specific embodiments of the present invention will be further described in conjunction with the accompanying drawings.

[0034] Such as figure 1 Shown is a general flow chart of a standard electric energy meter software frequency conversion sampling measurement method, the method includes the following steps:

[0035] Step 1: Set the initial power frequency voltage frequency, the number of samples per cycle, calculate the initial A / D sampling frequency, and determine the sampling interval;

[0036] Step 2: Start A / D sampling, sample voltage and current, and record the sampled value and sampled sequence value;

[0037] Step 3 judges whether the voltage crosses zero upwards, that is, judges whether one sampling period of voltage sampling is over, if one sampling period of voltage sampling is over, skip to step 5, if one sampling period is not over, continue to step 4;

[0038] Step 4: Accumulate the power in this sampling period, then jump to step 11

[00...

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Abstract

The invention discloses a standard electric energy meter software frequency conversion sampling metering method, and belongs to the field of electric energy metering. According to the technical scheme, the method comprises the steps of setting an initial power frequency voltage frequency and a sampling number in each period, calculating an initial A / D sampling frequency, and determining a sampling interval; starting A / D sampling, sampling the voltage and the current, and recording a sampling value and a sampling sequence value; judging whether the voltage upwards passes through zero or not; calculating the time before and after the voltage zero crossing point between the two sampling points; accumulating the electric quantity before the zero crossing point to the metering period; calculating the metering power and the accumulated total electric quantity of the metering period; calculating and setting a new sampling frequency; storing the current sampling data, and entering a new sampling period; and continuing A / D sampling and recording a sampling value and a sampling sequence value. According to the high-precision electric energy metering method provided by the invention, metering errors generated in a non-full period in metering sampling are eliminated, very high metering precision can be achieved, and high-precision metering is completed without a complicated hardware device.

Description

technical field [0001] The invention relates to the field of electric energy measurement, in particular to a standard electric energy meter software frequency conversion sampling measurement method. Background technique [0002] Electric energy metering is to realize the function of online electric energy metering through the combination of secondary circuit, transformer and electric energy meter according to a certain structure. Electric energy metering devices are used to measure electricity consumption, and its accuracy has a direct impact on the economic interests of both power supply parties. Therefore, improving the accuracy of electricity consumption measurement and minimizing the comprehensive error of the metering device can truly achieve fair and reasonable charging. Existing standard tables require an accuracy of generally 0.05%, and it is difficult to achieve a maximum of 0.01%. [0003] The electric energy meter has developed from the electromechanical type to...

Claims

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Application Information

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IPC IPC(8): G01R22/10
CPCG01R22/10
Inventor 范建华付刚朱建国叶恒
Owner QINGDAO TOPSCOMM COMM
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