Metering error quantitative analysis method for electric energy meter under harmonic wave condition

A technology of measurement error and analysis method, applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve problems such as difficulty in determining the direction of harmonic power flow, measurement technology without recognized theoretical analysis methods, etc.

Active Publication Date: 2013-10-02
WUHAN UNIV
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Problems solved by technology

[0006] If there are background harmonics in the system, the situation will be more complicated. The nonlinear load also absorbs the fundamental power and emits harmonic power, and at the same time absorbs the harmonic power generated by other nonlinear loads, resulting in the flow direction of difficult to determine
This is essentially a problem of determining the source of harmonic generation and sharing responsibility, but there is no recognized theoretical analysis method and practical measurement technology in this regard.

Method used

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  • Metering error quantitative analysis method for electric energy meter under harmonic wave condition
  • Metering error quantitative analysis method for electric energy meter under harmonic wave condition
  • Metering error quantitative analysis method for electric energy meter under harmonic wave condition

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Embodiment Construction

[0056] The present invention will be further described below in conjunction with accompanying drawing.

[0057] figure 1 It is a single-phase equivalent circuit when there are both linear loads and nonlinear loads in the power system. In the figure, AC represents the system power supply of the power frequency fundamental wave, and Rs represents the sum of the internal resistance of the power supply and the resistance of the power supply line. The phase voltage supplied to the load is u, and the phase current flowing into the load is i L . The specific steps of the quantitative analysis method for the measurement error of the electric energy meter under the background of a kind of harmonic of the present invention are:

[0058] Step 1. Calculate the harmonic components of voltage and current. Fourier decomposition of voltage and current under steady-state conditions (this method is a conventional and mature method for harmonic analysis) can be expressed as:

[0059] ...

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Abstract

The invention provides a metering error quantitative analysis method for an electric energy meter under a harmonic wave condition. According to the method, a metering error is expressed as an expression of the harmonic wave voltage distortion rate, the harmonic wave current distortion rate and the power factor, and an influence rule of the harmonic wave voltage distortion rate, the harmonic wave current distortion rate and the power factor to the metering error is quantitatively analyzed. The analysis method and result can provide an important basis for improving the accuracy and the reasonableness of a metering system under the harmonic wave condition.

Description

technical field [0001] The invention relates to a quantitative analysis method for the metering error of an electric energy meter under the harmonic background. Background technique [0002] With the development of my country's economy and the rapid development of power demand, the number of high-voltage, large-capacity nonlinear equipment in the power grid is increasing, and the harmonic pollution caused by it is becoming more and more serious. While absorbing the fundamental active power, the nonlinear load in the system will convert part of the fundamental active power into harmonic power and inject it into the power system, becoming the harmonic source of the power system; while the linear load absorbs the fundamental active power At the same time, it will also be forced to absorb harmonic power. [0003] At present, there are mainly three ways to measure active power by electronic energy meters in my country: only measure fundamental wave power; measure full wave power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/04
Inventor 乐健彭宏亮刘开培罗汉武
Owner WUHAN UNIV
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