Three-phase reactive power measuring and crosstalk compensating method for electric energy metering chip

An electric energy metering chip and crosstalk compensation technology, which is applied in the direction of electric power measurement through current/voltage, can solve problems such as reactive power calculation errors, small signal crosstalk noise effects, etc., and achieve high real-time performance, accurate measurement, and high practicality value effect

Active Publication Date: 2013-05-01
SHANGHAI BEILING
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Problems solved by technology

[0004] The purpose of the present invention is to provide a three-phase reactive power measurement and crosstalk compensation method for electric energy metering chips, which realizes the accurate

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  • Three-phase reactive power measuring and crosstalk compensating method for electric energy metering chip
  • Three-phase reactive power measuring and crosstalk compensating method for electric energy metering chip
  • Three-phase reactive power measuring and crosstalk compensating method for electric energy metering chip

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing.

[0020] The energy metering chip samples three current signals and three voltage signals through three single-phase channels to measure three-phase reactive power. One single-phase channel corresponds to one current signal and one voltage signal. see Figure 4 , the three-phase reactive power measurement and crosstalk compensation method that is used for electric energy metering chip of the present invention, comprises the following steps:

[0021] For one single-phase channel, execute steps S1~S3 once, because there are three single-phase channels, execute steps S1~S3 three times:

[0022] Step S1, for a current single-phase channel, calculate the single-phase reactive power VAR501 of the single-phase channel according to one current signal and one voltage signal 506 (phase A, phase B or phase C) of the single-phase channel; where , single-phase reactive power V is the ...

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Abstract

The invention discloses a three-phase reactive power measuring and crosstalk compensating method for an electric energy metering chip. The method comprises the following steps of calculating each single-phase reactive power; compensating each single-phase reactive power, so as to obtain the compensated single-phase reactive power; carrying out small-signal detection, and according to the detection result, selecting the single-phase reactive power or the compensated single-phase reactive power to calculate the total reactive power; and carrying out inverse compensation on the total reactive power. The method has the advantages that the accurate measuring of the three-phase reactive power is realized; and the problem of calculation error of the reactive power caused by the easy influence of crosstalk noise on the small signal in the electric energy metering chip is solved.

Description

technical field [0001] The invention relates to the field of electric energy metering, in particular to a three-phase reactive power measurement and crosstalk compensation method for electric energy metering chips. Background technique [0002] Electric energy measurement is an important basic work that is indispensable for the production, scientific research and operation management of electric power enterprises. Nowadays, the calculation of reactive power is mainly completed by the metering chip in the electric energy meter. [0003] At present, three-phase electric energy metering chips mostly use analog front-end and digital signal processing for metering and calculation. When measuring three-phase reactive power, it is necessary to sample three currents and three voltages at the same time, and a total of 6 analog-to-digital converters are used. The analog circuit and the subsequent digital circuit are integrated in one chip, and crosstalk between analog channels is una...

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Application Information

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IPC IPC(8): G01R21/06
Inventor 潘科韩明
Owner SHANGHAI BEILING
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