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Multi-harmonic-source harmonic contribution quantitative analysis method based on total-least square method

A least square method and multi-harmonic source technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as failure to consider the existence of errors in independent variable harmonic currents, and achieve great practical engineering application value and results accurate effect

Active Publication Date: 2017-02-22
UNIV OF JINAN
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Problems solved by technology

The disadvantages of the data analysis method are: in the process of calculating the parameters of the equation, only the dependent variable harmonic voltage is considered to have errors in the measurement process, but the independent variable harmonic currents are also not considered to have errors in the measurement process

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  • Multi-harmonic-source harmonic contribution quantitative analysis method based on total-least square method
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  • Multi-harmonic-source harmonic contribution quantitative analysis method based on total-least square method

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] The invention proposes to apply the total least square method to the quantitative analysis of harmonic responsibility of multi-harmonic sources. The method takes into account the measurement errors of harmonic voltage and harmonic current during the measurement process. Compared with the least squares method, it can be seen that the logic of the method proposed in the present invention is more rigorous, and the evaluation accuracy is also improved. Finally, the superiority of the method is verified by IEEE 14-node simulation.

[0029] 1 Model building

[0030] Assuming that there are n harmonic source loads in the system at the same time, and node X is selected as the harmonic responsibility monitoring point, the harmonics generated at node X are generated by the joint action of n harmonic sources in the system, as shown in figure 1 Shown:

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Abstract

The invention discloses a multi-harmonic-source harmonic contribution quantitative analysis method based on a total-least square method. The multi-harmonic-source harmonic contribution quantitative analysis method includes: selecting harmonic voltage as the index for evaluating harmonic contribution, and determining the joint action of the harmonic source of each node; sectioning measured data according to time, and calculating the harmonic contribution in each time section according to the projection of the harmonic voltage of one harmonic source at one node on the total harmonic voltage at the node; using the total-least square method to solve harmonic impedance and the harmonic voltage, namely background harmonic voltage, of other harmonic sources at the node, and using a singular value decomposition method to obtain the solution of the total-least square method to obtain the quantitative data of each harmonic source at each node at each harmonic time. The multi-harmonic-source harmonic contribution quantitative analysis method has the advantages that the total-least square method is applied to the harmonic quantitative analysis field, the defect that a traditional method only considers variable harmonic voltage measuring errors and does not consider the independent variable harmonic current measuring errors is overcome, and obtained results are accurate.

Description

technical field [0001] The invention relates to a multi-harmonic source harmonic responsibility quantitative analysis method based on the total least square method. Background technique [0002] In recent years, the topological structure and load composition of my country's power grid have undergone tremendous changes. On the one hand, a considerable number of large-capacity, nonlinear and impact loads are connected to the power grid, and these loads generate relatively serious harmonics and flow into the power grid during the work process, making the harmonic pollution of the power grid increasingly serious. On the other hand, more and more Devices sensitive to harmonics, such as programmable controllers, AC / DC speed control devices, computers and precision instruments, put forward higher requirements for power quality, which makes it more and more important to control grid harmonics. In order to limit the harmonic flow into the power grid to the greatest extent and improv...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G06Q50/06
CPCG01R31/00G06Q50/06
Inventor 程新功张荣臻丁广乾王成友宗西举
Owner UNIV OF JINAN
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