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Harmonic wave quantitative measurement method of power system

A power system, quantitative measurement technology, applied in the direction of spectrum analysis/Fourier analysis, etc., can solve the problems of inaccurate measurement results, inaccurate measurement, unable to reflect all the characteristics and data of power system harmonics, etc.

Inactive Publication Date: 2014-12-24
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0004] However, the disadvantage of the two-dimensional harmonic measurement method is that the results of dynamic harmonic measurement are not accurate enough. In reality, most of the harmonics in the power system are dynamic harmonics.
The harmonic two-dimensional measurement method cannot follow the harmonic change, so the measurement result is inaccurate
[0005] Another shortcoming of the harmonic two-dimensional measurement method is that when performing mathematical statistics on the data of a certain time period of the harmonic analysis results, due to the inaccurate measurement and the fact that the time period is not all generated by power system harmonics Therefore, statistical data cannot reflect all the characteristics and data of power system harmonics
[0006] The disadvantage of the two-dimensional harmonic measurement method is that the harmonic impedance of the measurement system does not measure and calculate the harmonic amplification characteristics of the system and the harmonic resonance frequency of the system

Method used

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Examples

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Effect test

example 1

[0030] Use the power system dynamic harmonic three-dimensional following measurement method to measure the harmonic characteristics of the harmonic source electrical equipment, that is, the harmonic current characteristics; when the harmonic current of the electrical equipment is injected into the power grid, the harmonic impedance and harmonic amplification characteristics of the power grid should also be measured. Guide and manage factories to prevent and control harmonic hazards.

[0031] A Quantitative measurement of harmonic characteristics of electrical equipment:

[0032] Examples are measuring the harmonic characteristics of converters of rolling mills, electric locomotives, and hoists. Other harmonic source electrical equipment can refer to the method steps of this example.

[0033] a Determine the duration / TFT of dynamic harmonics occurring during the operation of electrical equipment:

[0034] The harmonic analysis result provided by the present invention has exac...

example 2

[0071] Quantitatively measure the harmonic current injected into the power supply system in steel mills. What has been said in Example 1 is not repeated.

[0072] Using the power system dynamic harmonic three-dimensional following measurement method to measure, you can directly follow the amplitude of each harmonic in the three-dimensional direction regardless of the specific frequency of the harmonic, and give the time curve of the three-dimensional direction following the harmonic amplitude.

[0073] The time course of A power system circulating dynamic harmonics determines the length of time. The rolling mill of the steel mill presses / TFT once and the rolling mill presses once per cycle / TFT; the measurement of exceeding / TFT or insufficient / TFT is only a qualitative measurement.

[0074] B is measured by the power system dynamic harmonic three-dimensional following measurement method. It is evaluated by the quantitative data of the harmonic current in the / TFT process, a...

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Abstract

The invention relates to a harmonic wave quantitative measurement method of a power system. For the current and voltage information of the power system, according to the time sequence and the synchronous equal-time-interval following harmonic wave three-dimensional direction, namely the harmonic wave amplitude and the dynamic variation features of the frequency along with the time, the amplitudes and frequencies of various orders of harmonic waves, the three-dimensional parameter and the three-dimensional curve of the time are obtained through measurement, the amplitude time curve and data of the various orders of three-dimensional following harmonic waves, the frequency time curve and data of the various orders of harmonic waves and the amplitude-versus-frequency curve and data of the various orders of harmonic waves are obtained through measurement, and the harmonic features and data of the power system are obtained through measurement in a quantitative mode. According to the harmonic wave quantitative measurement method of the power system, the harmonic wave impedance and harmonic resonance amplification feature of a power grid are accurately measured.

Description

technical field [0001] The invention relates to a method for measuring electrical equipment and grid harmonics. Background technique [0002] Electrical equipment and power grid harmonics are referred to as power system harmonics. Power system harmonics are high-order harmonics with a power frequency of 50 Hz as the fundamental wave. An existing method for quantitatively measuring the harmonics of the power system is to continuously record the current and voltage information of the power system, use a microcomputer to perform Fourier analysis at equal intervals, and give the amplitudes of each harmonic marked according to the integral multiple of the 50 Hz fundamental wave The time curve analysis results of the harmonic analysis results, mathematical statistics are performed on the data of a certain period of time in the harmonic analysis results, and the harmonic statistical parameters are given. The harmonic current injected into the system is used as the system input, and...

Claims

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Application Information

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IPC IPC(8): G01R23/16
Inventor 胡绍刚刘君周志玉王润洲戚雪
Owner STATE GRID CORP OF CHINA
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