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A Multi-harmonic Responsibility Allocation Method Considering Background Harmonic Voltage Fluctuations and Impedance Changes

A technology of voltage fluctuations and background harmonics, applied in the field of multi-harmonic responsibility division considering background harmonic voltage fluctuations and impedance changes, can solve problems such as interference mutation point detection, affecting data segment division, etc.

Active Publication Date: 2021-03-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Another study proposes to use the wavelet transform modulus maximum method to detect the time point when the system harmonic impedance changes, so as to process the measurement data in segments, but when there is a large background harmonic voltage fluctuation in the system, it may interfere with the sudden change The detection of points, thus affecting the division of data segments

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[0056] Below in conjunction with accompanying drawing, the present invention is described in detail.

[0057] A detailed reasoning analysis method and a demonstration analysis example are disclosed below. However, the specific reasoning and analysis process details disclosed herein are for the purpose of describing exemplary analysis cases only.

[0058] It should be understood, however, that the invention is not limited to the particular exemplary embodiments disclosed, but covers all modifications, equivalents, and alternatives falling within the scope of the disclosure. Throughout the description of the figures, the same reference numerals denote the same elements.

[0059] The present invention proposes a multi-harmonic responsibility division method that considers background harmonic voltage fluctuations and impedance changes. First, the similarity measurement is performed on the time series of harmonic voltages and harmonic currents at the point of common connection (Po...

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Abstract

The invention proposes a multi-harmonic responsibility division method considering background harmonic voltage fluctuation and impedance change. First, the similarity measurement principle is used to screen out the data segments with small background harmonic voltage fluctuations, and then the scatter diagram of the common connection point harmonic voltage and harmonic current data group is established, and the OPTICS algorithm is used for clustering and arrangement. The reachability distance selects the appropriate clustering parameters, so that the sampling data can be divided into different clusters according to the system impedance value, and finally the partial least square method is used to divide the multi-harmonic source responsibility for the data of different clusters. The simulation analysis verifies that the proposed method can better reduce the influence of background harmonic voltage fluctuations and system impedance changes on the division of harmonic responsibilities, and has a wider scope of application.

Description

technical field [0001] The invention belongs to the technical field of power harmonic analysis, in particular to a multi-harmonic responsibility division method considering background harmonic voltage fluctuations and impedance changes. Background technique [0002] With the access of high-penetration distributed power sources and the popularization of electric vehicles, the use of a large number of power electronic devices such as rectifiers and inverters has made the problem of harmonic pollution in power systems increasingly serious. Accurately assessing the harmonic responsibilities of the system and each user is the premise of harnessing harmonic problems. Traditional harmonic responsibility division methods are mostly estimated under the condition that the background harmonic voltage fluctuation is small and the system impedance is constant. In the actual operating system, the background harmonic voltage usually fluctuates. For example, the photovoltaic power supply i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16G06K9/62
CPCG01R23/16G06F18/2321
Inventor 徐永海刘子腾
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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