A kind of electric energy meter measuring method

Abstract

The invention relates to a metering method of an electric energy meter, which comprises the following steps: before the electric energy meter leaves the factory, the first adjustment coefficient for adjusting the metering data of the full-wave current and the metering data for the half-wave current are stored in the MCU inside the meter. The second adjustment coefficient for adjustment; the MCU reads and stores the current waveform sampling data in the metering chip, and performs discrete Fourier transform on the current waveform sampling data, and calculates the even harmonic content and odd harmonic content Then judge whether the above-mentioned even harmonic content is within the set threshold range and the odd harmonic content is 0 or a value close to 0; if so, it is determined that this is a half-wave current, and the second adjustment coefficient Adjust the electric energy measured by the electric energy meter; if not, call the first adjustment coefficient to adjust the electric energy measured by the electric energy meter. In the method, the error adjustment of the half-wave current can be realized, and the measurement accuracy of the electric energy meter is improved.

Description

technical field [0001] The invention relates to the field of electric energy meters, in particular to a measurement method for electric energy meters. Background technique [0002] As a standard electric energy meter, the electric energy meter is accurate or not related to the vital interests of the power grid company and the electricity user. With the wide application of power electronics technology, there are more and more half-wave rectification power supply circuits (such as: switching power supply, etc.) in the power consumption environment. [0003] Conventional energy meters are designed for power frequency sine waves (full waves), and the existing sampling components are also used to measure full waves. At present, the commonly used sampling components are current transformers, so they are usually used to measure full-wave electric energy The meter is applied to the power environment of the half-wave current, because the DC component of the half-wave current causes ...

AI Technical Summary

Problems solved by technology

[0003] Conventional energy meters are designed for power frequency sine waves (full waves), and the existing sampling components are also used to measure full waves. At present, the commonly used sampling components are current transformers, so they are usually used to measure full-wave electric energy The meter is applied to the power environment of the half-wave current, because the DC component of the half-wave current causes the magnetic saturation of the sampling element (current transformer), which will cause a phase difference between the input and output of the sampling element (current transformer), which will cause The problem of inaccurate measurement

In addition, the power consumption environment can also be waveforms other than full-wave and half-wave, but the current energy meter for measuring full-wave can not completely and accurately measure the user's power consumption data, so further improvement is needed

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