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Method for measuring electric energy of harmonic power network

A technology of electric energy measurement and harmonics, which is applied in the direction of measuring electric variables, measuring devices, instruments, etc., can solve the problems that the fundamental wave electric energy and harmonic electric energy cannot be correctly reflected, and achieve the effect of controlling harmonics

Active Publication Date: 2012-09-12
STATE GRID CHONGQING ELECTRIC POWER +1
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AI Technical Summary

Problems solved by technology

Both inductive and electronic watt-hour meters will show their inherent deficiencies, neither can correctly reflect the fundamental wave electric energy and harmonic electric energy

Method used

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  • Method for measuring electric energy of harmonic power network
  • Method for measuring electric energy of harmonic power network
  • Method for measuring electric energy of harmonic power network

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Embodiment Construction

[0033] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

[0034] figure 1 The flow chart of the method for measuring harmonic power grid electric energy provided by the embodiment of the present invention is shown in the figure: the method for measuring harmonic power grid electric energy provided by the present invention includes the following steps:

[0035] First collect the harmonic content and harmonics injected into the grid by users,

[0036] Calculate the waveform distortion rate THD of the harmonic waveform in different periods,

[0037] Then determine the relationship between the waveform distortion rate THD and the preset waveform distortion rate threshold;

[0038] Finally, different metering methods are used to ...

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Abstract

The invention discloses a method for measuring electric energy of a harmonic power network. The method comprises the following steps of: collecting harmonic content and harmonic waves injected in the power network by a user; calculating the total harmonic distortion (THD) of harmonic waveforms at different time intervals, judging a relationship between the THD and a preset waveform distortion factor threshold value, and respectively calculating the electric energy in different measuring modes. A threshold value (referring to a national harmonic standard limit) is set according to different THDs under harmonic conditions so as to distinguish that the user is a harmonic user or a non-harmonic user in different measuring modes, if the harmonic influence is large, and the user serves as a linear user, the sum of electric energy of the consumed fundamental waves and harmonic waves is calculated, and simultaneously the electric energy of the harmonic waves injected into the power network is recorded so as to be used as a technical reference index; and if the harmonic influence is extremely large and belongs to a typical harmonic source load, the sum of absolute values of the electric energy of the consumed fundamental waves and harmonic waves and the harmonic waves injected into the power network is calculated, and an aim of controlling the harmonic waves is fulfilled finally.

Description

technical field [0001] The invention relates to the technical field of power grid electric energy measurement, in particular to a method for measuring harmonic power grid electric energy. Background technique [0002] At present, there are hundreds of millions of meters of various types used for power system electric energy measurement. However, most of the design principles of electric energy metering instruments are based on the assumption of sinusoidal cycle voltage and current signals, and its theoretical basis is the power theory of sinusoidal circuits. The design principle of a small number of high-end electric energy metering instruments is based on the assumption of non-sinusoidal periodic voltage and current signals, and its theoretical basis is the traditional non-sinusoidal circuit power theory. [0003] However, with the rapid development of modern science and technology, high-voltage, large-capacity impact equipment such as electric arc furnaces, rolling mills,...

Claims

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Application Information

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IPC IPC(8): G01R22/06
Inventor 郑贺伟张捷陈鹏石孝文冯俊姚思蓼
Owner STATE GRID CHONGQING ELECTRIC POWER
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