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Frequency-band-divided Hanning self-convolution window low-frequency oscillation online detection method

A low-frequency oscillation and detection method technology, applied in the field of detection and analysis, can solve the problems of low-frequency oscillation alarm delay and other issues, and achieve the effect of rapid detection and timely alarm

Pending Publication Date: 2021-03-26
XUJI GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the frequency spectrum analysis method with a fixed window is used to set the window to 10s, although the 0.1Hz oscillation can be detected and the 2.5Hz oscillation can be identified at this time, the 2.5Hz oscillation may have oscillated for dozens of cycles at this time, resulting in LFO warning delay

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  • Frequency-band-divided Hanning self-convolution window low-frequency oscillation online detection method
  • Frequency-band-divided Hanning self-convolution window low-frequency oscillation online detection method
  • Frequency-band-divided Hanning self-convolution window low-frequency oscillation online detection method

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0026] The FFT power system low-frequency oscillation detection method based on the Hanning self-convolution window of the present invention will be described below in conjunction with the accompanying drawings.

[0027] The invention provides a low-frequency oscillation frequency band division for the active power oscillation curve calculated by the three-phase voltage and three-phase current collected by the wide-freque...

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Abstract

The invention discloses a frequency-band-divided Hanning self-convolution window low-frequency oscillation on-line detection method, and the method comprises the steps: carrying out the low-frequencyoscillation frequency band division of an active power oscillation curve calculated by a three-phase voltage and a three-phase current collected by a broadband oscillation device according to the different requirements of different low-frequency oscillation alarm time; achieving the quick recognition of low-frequency oscillation through employing the fast Fourier transform of an applied Hanning self-convolution window, thereby achieving the quick detection and timely alarm of low-frequency oscillation in different oscillation periods, facilitating the timely finding of a problem by an operator, and guaranteeing the stable and reliable operation of a power system.

Description

technical field [0001] The invention relates to the technical field of detection and analysis, in particular to an on-line detection method for low-frequency oscillation of a Hanning self-convolution window in frequency divisions. Background technique [0002] The low-frequency oscillation of the power system is an inherent phenomenon of the interconnected system. The main manifestation is that when the system is disturbed, the rotors of each generator will sway relative to each other, resulting in active power oscillation on the tie line. Accurate identification of low-frequency oscillation signals is an important prerequisite for diagnosing and detecting the operating state of the power grid and suppressing low-frequency oscillations to ensure stable operation of the grid interconnection. [0003] When low-frequency oscillation occurs in the power system, the online low-frequency oscillation detection program of the broadband measurement device needs to perform fast spectr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/165G01R23/177
CPCG01R23/165G01R23/177
Inventor 王莉余高旺石欣朱云峰李旭王智勇许云龙蔺立
Owner XUJI GRP