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A direct current metering method

A metering method and metering technology, which is applied in the field of photovoltaic power generation new energy direct current energy metering, charging piles, and direct current metering methods, can solve inaccurate problems, achieve the effect of improving accuracy and adaptability, and effective meter accuracy

Active Publication Date: 2019-05-28
WILLFAR INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a direct current metering method with self-adaptive input signal polarity, which can overcome the problem of inaccurate metering that occurs when the polarity of the sampling input signal changes under different working conditions, and improve the applicability of the direct current metering instrument

Method used

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Embodiment Construction

[0044] The DC metering method for adapting the polarity of the input signal of the present invention, first in the meter calibration mode, respectively corrects the meter calibration parameters of different access modes of the meter through the metering algorithm and stores them in the internal card.

[0045] The calibration parameter model of the positive and negative poles depends on the connection mode of the positive and negative poles and the polarity of the current signal. Calibration parameters are divided into two models, one is the negative calibration parameter model; the other is the positive calibration parameter model. Its calibration parameter model is composed of voltage zero noise offset (V_S_OFFSET), current zero noise offset (I_S_OFFSET), voltage gain G v_gain , current gain G i_gain , power gain G p_gain , power offset V_offset, current DC offset I_offset, voltage DC offset U_offset, LCD brightness compensation coefficient LCD_offset and other parameters. ...

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Abstract

The invention relates to a DC metering method. The method comprises that in a calibration mode, calibration parameters of a meter in different access modes are obtained, and a calibration parameter model is obtained; in an application operation mode, an autonomous signal polarity identification algorithm is used to distinguishing signal polarities of voltage and current and determine a meter access manner; and according to the calibration parameter corresponding to the meter access manner and the current polarity condition, compensation is carried out, and an electric energy parameter is obtained. According to the method, the accuracy of the electric meter is high under the different access manners of voltage and current sampling signals in the electric energy metering field, and the accuracy and adaptability for different signal access modes of a DC electric energy meter are improved.

Description

technical field [0001] The invention relates to a direct current metering method, which belongs to the technical field of electric energy metering and can be used in the field of direct current electric energy metering of charging piles and photovoltaic power generation new energy sources. Background technique [0002] With the decrease of fossil resources dominated by oil and coal and the deepening of human beings' concept of environmental protection, low-energy, clean and environmentally friendly electric vehicles and photovoltaic power generation equipment have begun to enter modern civilized life. The demand for supporting meter products for DC metering is rapid, and new fields such as new energy microgrids have diversified requirements for meter access methods. The voltage and current sampling signals are not in a constant direction in the time dimension, and there is a charging and discharging process. [0003] In traditional DC metering methods, in order to reduce the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R22/10
CPCG01R22/10
Inventor 曾定张雷马亮
Owner WILLFAR INFORMATION TECH CO LTD