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Amplitude fluctuation quantity kurtosis detection principle-based harmonic contribution quantification method

A quantification method and technology of fluctuations, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as difficult to accurately and directly measure phase angle values, and achieve the effects of easy engineering application, reducing impact, and ensuring accuracy

Active Publication Date: 2018-11-20
SOUTHEAST UNIV
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Problems solved by technology

Existing methods focus on the complex domain of harmonics, but the current harmonic monitoring system configured in substations is difficult to accurately and directly measure the phase angle value of each harmonic, so it is necessary to consider how to use harmonic amplitude data to realize harmonic responsibility division

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  • Amplitude fluctuation quantity kurtosis detection principle-based harmonic contribution quantification method
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  • Amplitude fluctuation quantity kurtosis detection principle-based harmonic contribution quantification method

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Embodiment Construction

[0043] The technical solutions of the present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0044] Such as figure 1 As shown, the harmonic liability quantification method based on the amplitude fluctuation kurtosis detection principle of the present invention comprises the following steps:

[0045] Step 10) collecting harmonic measured data: collecting harmonic voltage amplitude and harmonic current amplitude data to form a harmonic amplitude data sequence;

[0046] Step 20) setting sliding window parameters: respectively setting sliding window length and sliding distance;

[0047] Step 30) Calculate the kurtosis value and filter the subsequence: calculate the kurtosis value of the harmonic voltage amplitude and the harmonic current amplitude in the order of the sliding window for the harmonic amplitude data sequence formed in the step 10), and filter out the peak A subsequence whose degree value is not equal to ...

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Abstract

The invention discloses an amplitude fluctuation quantity kurtosis detection principle-based harmonic contribution quantification method. The method includes the following steps that: step 10) harmonic measured data are collected; harmonic voltage amplitude and harmonic current amplitude data are collected, so that a harmonic amplitude data sequence is formed; step 20) the parameters of a slidingwindow are set: a sliding window length and a sliding distance are set; step 30) kurtosis value calculation and subsequence screening are performed: the kurtosis values of the harmonic voltage amplitude and harmonic current amplitude are calculated sequentially according to sliding window on the basis of the harmonic amplitude data sequence, and subsequences of which the kurtosis values are not equal to expected values are screened out; and step 40) harmonic voltage contribution calculation is carried out: the system side equivalent harmonic impedance of the subsequences which are screened out are estimated through a fluctuation quantity method, and a harmonic voltage contribution is calculated. According to the method, the harmonic pollution contribution can be quantified just with the amplitude data of harmonic waves required to be monitored, and therefore, the calculation amount of the method is small, the engineering application of the method can be facilitated, and assistancecan be provided for harmonic control and the formulation of a reward and punishment mechanism.

Description

technical field [0001] The invention belongs to the technical field of power quality monitoring and analysis, and specifically relates to a harmonic responsibility quantification method based on the principle of amplitude fluctuation kurtosis detection. Background technique [0002] With the rapid development of the smart grid, various impact and non-linear loads and new energy sources such as wind power and photovoltaics are connected to the grid on a large scale, resulting in serious distortion of the waveform in the grid. Harmonics quickly spread from local areas to the entire power grid, which has brought great harm to the safe and stable operation of the system. At the same time, modern power users have gradually increased their requirements for power quality, and the increasingly prominent harmonic problems have greatly affected their economic benefits. [0003] In order to effectively suppress the harmonics in the power grid, it is necessary to conduct an economic eva...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 邱海峰吴健
Owner SOUTHEAST UNIV
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