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Large scale electric network low-frequency oscillation frequency division section detection method based on empirical mode decomposition

A technology of empirical mode decomposition and low frequency oscillation, applied in the direction of spectrum analysis/Fourier analysis, etc., can solve the problems of large calculation amount of detection method, inability to detect dangerous low frequency oscillation quickly and accurately at the same time, to reduce the amount of calculation, Guaranteed timeliness and accuracy, the effect of strong adaptability

Inactive Publication Date: 2009-04-15
BEIJING SIFANG JIBAO AUTOMATION +1
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Problems solved by technology

[0005] Aiming at the problem that the existing wide-area measurement system WAMS cannot quickly and accurately detect dangerous low-frequency oscillations in different frequency bands at the same time in the real-time low-frequency oscillation detection of large-scale power systems, and the current detection method has a large amount of calculation

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  • Large scale electric network low-frequency oscillation frequency division section detection method based on empirical mode decomposition
  • Large scale electric network low-frequency oscillation frequency division section detection method based on empirical mode decomposition
  • Large scale electric network low-frequency oscillation frequency division section detection method based on empirical mode decomposition

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Embodiment Construction

[0023] The technical solution of the present invention will be further described in detail below in accordance with the drawings in the specification and in combination with specific embodiments.

[0024] The invention proposes a low-frequency oscillation detection method of a power grid based on empirical mode decomposition and adopts frequency division, variable time window, variable sampling rate, and variable moving step technology. On the basis of ensuring the ability of ordinary empirical mode decomposition method to deal with complex waveforms with nonlinear, non-stationary changes, and non-periodic components, this method greatly speeds up the simultaneous spectrum analysis of a large number of phasor measurement unit (PMU) measured oscillation curves. Speed, which solves the problem that low-frequency oscillations of different frequencies have different requirements for alarm time, so that a large number of measured oscillation curves can be decomposed into natural mod...

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Abstract

The invention belongs to the technical field of on-line detection and analysis for the low-frequency oscillation of an electric power system, and provides an on-line frequency band fast low-frequency oscillation detection and analysis method which aims at the wide area measurement system data and is applicable to a large-scale electric power system base on the empirical mode decomposition. The method of the invention not only has the strong adaptability to the non-linear and unstable complex waveform with non-periodic components, but also has synchronous and fast frequency spectrum analysis on the large amount of actual measurement curves of a phasor measuring unit can be realized through frequency band distribution, variable time window change and variable step, so that the fast detection and timely alarm to the low-frequency oscillation of various frequencies with different time periods can be realized.

Description

technical field [0001] The invention belongs to the technical field of on-line detection and analysis of low-frequency oscillations in electric power systems, and more specifically relates to a method for performing online rapid low-frequency oscillation spectrum analysis on wide-area phasor measurement information in electric power systems. Background technique [0002] When low-frequency oscillation occurs in the power system, the online low-frequency oscillation detection program in the wide-area measurement system needs to obtain the frequency, amplitude, damping ratio and oscillation mode information of the oscillation through fast spectrum analysis of the quantity measurement of the phasor measurement unit PMU. When it is found that the oscillation amplitude is large and the damping is small, the operating personnel need to be alerted in time. In order to reliably detect and calculate the parameters of a certain mode of low-frequency oscillation, at least one cycle of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
Inventor 段刚林俊杰吴京涛
Owner BEIJING SIFANG JIBAO AUTOMATION
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