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Ultralow-frequency oscillation identification method based on matrix pencil method

An identification method, ultra-low frequency technology, applied in the direction of reducing/preventing power oscillation, system integration technology, AC network circuits, etc., can solve problems such as large threats

Inactive Publication Date: 2019-02-22
CHINA SOUTHERN POWER GRID COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the negative damping caused by the hydropower governor and the negative damping caused by the rigid load characteristics, Yunnan is threatened by ultra-low frequency oscillation after asynchronous operation.

Method used

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  • Ultralow-frequency oscillation identification method based on matrix pencil method
  • Ultralow-frequency oscillation identification method based on matrix pencil method
  • Ultralow-frequency oscillation identification method based on matrix pencil method

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Effect test

Embodiment 1

[0051] Using the observation sequence described above as a simulation example, under the condition of no noise, adopt the improved matrix beam algorithm identification method based on principal component analysis of the present invention, the threshold is set to γ=0.995, and the signal-to-noise ratio is SNR=582.8946 , with figure 1 In the case of no noise, the identification result of the signal modal information by the method of the present invention is given. The identification results of the three modes by the method of the present invention are shown in the table below. Under the condition of no noise, the method proposed in the present invention can accurately identify all three oscillation modes.

[0052] The identification results of the improved matrix beam algorithm when γ=0.995 under the condition of no noise

[0053]

[0054]

[0055] At the same time, under the same conditions, the ITD identification method was used instead for comparison. attached figur...

Embodiment 2

[0060] Using the observation sequence described above as a simulation example, in the presence of noise, the improved matrix beam algorithm identification method based on principal component analysis of the present invention is adopted, the threshold is set to γ=0.995, and the signal-to-noise ratio is SNR=582.8946 , with image 3 In the case of noise, the identification result of the signal mode information by the method of the present invention is given. The identification results of the three modes by the ITD identification method are shown in the table below. In the case of noise, when the threshold value of the method proposed by the present invention is set to γ=0.995, there is a situation of missed identification in the case of mode 2.

[0061] The identification results of the improved matrix beam algorithm when γ=0.995 in the presence of noise

[0062]

[0063]

[0064] At the same time, under the same conditions, the ITD identification method was used instead ...

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Abstract

The invention discloses an ultralow-frequency oscillation identification method based on a matrix pencil method, belongs to the technical field of stability control, and aims to provide an ultralow-frequency oscillation modal identification method reasonable in design and accurate in analysis for an ultralow-frequency oscillation phenomenon occurring after asynchronous networking. The method comprises constructing a Hankel matrix by a sampling sequence and performing singular value decomposition on the Hankel matrix; obtaining the maximum modal number by setting a threshold; and improving a matrix pencil algorithm based on principal component analysis; and finally realizing the identification of the ultralow-frequency oscillation mode. The result of the embodiment of the present inventiondemonstrates the effectiveness and the feasibility of the provided improved matrix pencil algorithm based on principal component analysis for the identification of the ultralow frequency oscillation signals in a wide-area system. The method solves the problem of the ultralow frequency oscillation in an asynchronous networking scene seriously threaten the safe and stable operation of the grid.

Description

technical field [0001] The invention relates to the identification problem of ultra-low frequency oscillation in an asynchronous networking scene, and belongs to the technical field of power system stability control. Background technique [0002] Low-frequency oscillation affects the safe and stable operation of the power system for a long time, which is mainly caused by the rapid action of the excitation system and the weak connection between regional power grids. By constructing DC transmission lines to asynchronously interconnect regional grids, the grid structure can be enhanced to mitigate the effects of ultra-low frequency oscillations. However, after the asynchronous connection between Yunnan Power Grid and the main grid of China Southern Power Grid in 2016, a long-term, ultra-low frequency frequency oscillation phenomenon appeared inside Yunnan Power Grid. The Yunnan power grid has the following operating characteristics: First, the proportion of installed capacity ...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20Y02E40/70Y02E60/00Y04S10/22
Inventor 张建新谢惠藩姚海成雷傲宇王波马恒瑞
Owner CHINA SOUTHERN POWER GRID COMPANY
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