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Electric energy accurate measurement method and electric energy accurate measurement device under fluctuating load

A technology of fluctuating loads and metering methods, applied in measuring devices, measuring electrical variables, instruments, etc., can solve problems such as undercounting of electric energy, achieve the effect of ensuring real-time performance, unaffected accuracy and stability, and realizing real-time compensation

Active Publication Date: 2015-09-16
YANTAI DONGFANG WISDOM ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method does not fundamentally solve the problem of the integration time window under fast fluctuating loads. As long as the energy meter still uses an excessively long power integration time window, there will still be the problem of undercounting of electric energy caused by the phase change of the fluctuating current.

Method used

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  • Electric energy accurate measurement method and electric energy accurate measurement device under fluctuating load
  • Electric energy accurate measurement method and electric energy accurate measurement device under fluctuating load
  • Electric energy accurate measurement method and electric energy accurate measurement device under fluctuating load

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Embodiment Construction

[0040]The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] The method of the present invention is: as figure 1 , after sampling the voltage and current analog input signals through the AD analog-to-digital conversion chip, the current output signal is connected to the phase-shift filter for angle difference compensation. The filter adopts the FIR first-order filter design, and uses the FIR filter linear phase The characteristics of the current phase are changed to compensate the angular difference caused by the transformer, to achieve the effect of real-time compensation of the transformer angular difference, and to ensure the accuracy of the subsequent real-time power calculation.

[0042] The FIR first-order filter is shown in the following formula:

[0043] ;

[0044] In the formula, the two parameters β and A are set according to the method in the TI specification document, and the pres...

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Abstract

The invention relates to an electric energy accurate measurement method and an electric energy accurate measurement device under a fluctuating load. The electric energy accurate measurement method comprises the steps that voltage and current analog quantities are subjected to analog-to-digital conversion of an AD (analog-to-digital) conversion chip and then connected to an instantaneous power calculator; the instantaneous power calculator adopts a dot product multiplier to calculate a relation among instantaneous power, voltage and current at a moment k; the instantaneous power is connected to a single-period time window integrator; the single-period time window integrator integrates and then outputs single-period average power; and the single-period average power is connected to a pulse transmitter and an electric energy accumulator so as to carry out accumulation of electric energy pulse output and positive and negative active / reactive power. By adopting the method and the device provided by the invention, accurate electric energy measurement can still be ensured under the condition that the load current amplitude fluctuates rapidly along with the time.

Description

technical field [0001] The invention relates to a method for accurately measuring electric energy under fluctuating loads, and also relates to a metering device for realizing the method for accurately measuring electric energy. It is mainly used in the electric energy meter platform to realize accurate measurement of electricity in the electric field with dynamic and impact loads. Background technique [0002] With the development of industry, a large number of high-power power electronic equipment has been put into operation in iron and steel plants, mines, ports, electrified railways, wind farms, etc., making the power load of most industrial sites show rapid changes and impact characteristics. The current amplitude fluctuates rapidly over time. However, the measurement accuracy of the electric energy meter verified under the condition of constant RMS current in the laboratory will be affected under such fluctuating loads. The main reason is the lack of electric energy me...

Claims

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Application Information

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IPC IPC(8): G01R22/10
Inventor 吴章宪刘笑菲
Owner YANTAI DONGFANG WISDOM ELECTRIC
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