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Distribution method based on waveform matching for harmonic voltage responsibility

A harmonic voltage and waveform matching technology, applied in the direction of measuring electricity, measuring electrical variables, spectrum analysis/Fourier analysis, etc., can solve the problems of increasing test costs and workload

Active Publication Date: 2016-10-12
SOUTHEAST UNIV
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Problems solved by technology

The above research method is aimed at the harmonic vector data, but the current power quality monitoring system of the substation only provides the amplitude data of the harmonic voltage or current. If an additional harmonic phase angle test is carried out, the cost and work of the test will be greatly increased. quantity

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  • Distribution method based on waveform matching for harmonic voltage responsibility
  • Distribution method based on waveform matching for harmonic voltage responsibility
  • Distribution method based on waveform matching for harmonic voltage responsibility

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Embodiment Construction

[0045] The technical solutions of the embodiments of the present invention will be further described below with reference to examples and accompanying drawings.

[0046] like figure 1 As shown, an embodiment of the present invention provides a method for dividing harmonic voltage responsibility based on waveform matching, including the following steps:

[0047] Step 10) Collect harmonic test data to form a harmonic data sequence.

[0048] Step 20) Set basic matching parameters. Setting the basic matching parameters includes setting the sliding window length L, the sliding distance T and the similarity setting value S.

[0049] Step 30) Calculate the Euclidean distance: According to the basic matching parameters set in step 20), normalize the harmonic data sequence formed in step 10) in subsequence order to obtain harmonic sample data, and calculate the harmonic sample data. Euclidean distance between harmonic voltage and harmonic current.

[0050] Step 40) Screening subseq...

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Abstract

The invention discloses a distribution method based on waveform matching for harmonic voltage responsibility. The distribution method comprises the steps of: step 10) acquiring harmonic test data, and forming a harmonic data sequence; step 20) setting basic matching parameters; step 30) calculating an Euclidean distance, wherein normalization processing is performed on the harmonic data sequence which is formed in the step 10) according to a sequence of subsequences based on the basic matching parameters set in the step 20) to obtain harmonic sample data, and the Euclidean distance between a harmonic voltage and a harmonic current in the harmonic sample data is calculated; step 40) screening the subsequences, wherein similarity of each subsequence is calculated, and the subsequence with the similarity not less than a set value is screened out; step 50) and distributing harmonic responsibility, wherein system-side equivalent harmonic impedances of the screened subsequences is estimated by adopting a least square method, and a mean value of the equivalent harmonic impedances is utilized for calculating the harmonic voltage responsibility. The distribution method can quantify harmonic pollution liability of a feeder by utilizing harmonic amplitude data, and is suitable for engineering practice.

Description

technical field [0001] The invention belongs to the technical field of power quality monitoring and analysis, and in particular relates to a method for dividing harmonic voltage responsibility based on waveform matching. Background technique [0002] With the development of the power system, a large number of traditional nonlinear loads and new energy sources such as photovoltaics and wind power are connected to the power grid, which makes the harmonic pollution in the power grid more and more serious. The national standard has made specific provisions on the allowable threshold of harmonics in the public power grid, but it cannot scientifically solve the disputes between the power supply and the consumer in the formulation of economic evaluation standards. In order to carry out an effective and reasonable economic evaluation of harmonic pollution, it is necessary to quantitatively divide the harmonic responsibilities of the system and users at the public connection point. ...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R23/16G06Q50/06
CPCG01R23/16G01R31/00G06Q50/06
Inventor 邱海峰顾伟王旭冲储佳伟
Owner SOUTHEAST UNIV
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