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Power revision circuit in electrical energy metering and power revision method

A technology for electric energy measurement and circuit correction, which is applied in the direction of measuring electric power, electric power measurement through current/voltage, and electric power measurement through application of digital technology, etc. It can solve the problems of unsatisfactory power, low reliability and low accuracy of power correction, etc.

Inactive Publication Date: 2009-08-05
VIMICRO CORP
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Problems solved by technology

However, the existing power correction still uses the same calibration parameter C to correct the power corresponding to the dynamic range of the entire input current, so that the corrected power cannot meet the requirement that the linearity error e is less than the preset error threshold
[0015] It can be seen that the reliability and accuracy of the existing power correction are low

Method used

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  • Power revision circuit in electrical energy metering and power revision method
  • Power revision circuit in electrical energy metering and power revision method
  • Power revision circuit in electrical energy metering and power revision method

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0045] In the embodiment of the present invention, when the voltage is constant, a plurality of corresponding calibration parameters are respectively set for the power values ​​corresponding to different current effective value ranges within the dynamic range of the input current, so as to ensure that the calculation of each current effective value range corresponds to The deviation of the power value relative to the ideal value is small, and the effective value of the input current is calculated, and the corresponding calibration parameters are selected according to the effective value of the current to correct the power, so that the power value corresponding to each effective value range of the current can be corrected After that, all of them can meet ...

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Abstract

The invention discloses a power correction circuit in electric energy metering and a power correction method in electric energy metering. In the case of a constant voltage, the present invention sets a plurality of corresponding calibration parameters for the power values ​​corresponding to different current effective value ranges, so as to ensure that the deviation of the calculated power value corresponding to each current effective value range from the ideal value is relatively small. Small, and calculate the effective value of the input current, select the corresponding calibration parameters to correct the power according to the effective value of the current, thus realizing the segmental correction of the power, and then ensuring that the power metering can be performed under the condition that the dynamic range of the input current is large. The linearity error between the power calculated in the circuit and the power measured by the meter calibration station is smaller than the preset threshold.

Description

technical field [0001] The invention relates to electric energy metering technology, in particular to a power correction circuit in electric energy metering and a power correction method in electric energy metering. Background technique [0002] Energy metering is the metering of energy generated by active power. In practical applications, there will be a certain linearity error between the power P1 calculated by the electric energy metering circuit and the power P0 measured by the meter calibration station. [0003] In order to solve the above-mentioned problems, usually, linearity correction is performed on the calculated power P1 in the electric energy metering circuit, so that the linearity error e is smaller than a preset error threshold, for example, 0.1%. [0004] in, e = ( E 1 - E 0 ) E ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R21/00G01R21/06G01R21/133
Inventor 范志军
Owner VIMICRO CORP
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