A harmonic responsibility division method based on improved data association analysis

A data correlation, harmonic technology, applied in spectrum analysis/Fourier analysis, data processing applications, instruments, etc.
CN109409762AInactive Publication Date: 2019-03-01CHENGDU POWER SUPPLY COMPANY OF STATE GRID SICHUAN ELECTRIC POWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHENGDU POWER SUPPLY COMPANY OF STATE GRID SICHUAN ELECTRIC POWER
Publication Date
2019-03-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a harmonic responsibility division method based on improved data correlation analysis, which comprises the following steps: step 1, under the condition that a harmonic phase angle is considered, establishing a relation between an h-order harmonic voltage and a harmonic current of a PCC point; 2, estimating the impedance angle of the power system based on the characteristicthat the covariance of the independent random variable is zero; 3, calculating the harmonic impedance of the power system based on the relation between the impedance angle of the power system, the harmonic voltage and the harmonic current; 4, obtaining harmonic voltage contributions of the user side and the power system side at the PCC point based on the harmonic impedance of the power system; User harmonic impedance is considered in the calculation process, and errors caused by neglecting the user harmonic impedance in a traditional method are reduced. Simulation analysis and actual engineering examples verify that compared with an existing method, the method can effectively suppress the influence caused by system harmonic change and user harmonic impedance, and a more accurate harmonic responsibility division result is obtained.
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Description

technical field

[0001] The invention relates to the field of harmonic responsibility division, in particular to a harmonic responsibility division method based on improved data association analysis. Background technique

[0002] With the development of industry, various power electronic devices and nonlinear loads are widely used in various sectors of the national economy, and the problem of harmonic pollution in power systems, especially in distribution networks, is becoming increasingly serious. After the harmonic current flows into the power grid, it will generate harmonic voltage at the point of public connection (PCC point), causing voltage distortion and seriously affecting the power quality. Therefore, a reasonable assessment of the harmonic voltage responsibilities of the power system and users at the PCC point is a prerequisite for realizing power quality management and control.

[0003] At present, the methods of dividing harmonic responsibilities at home and abro...

Claims

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