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An Analysis Method of Subsynchronous Oscillation Based on EEMD and Prony Method

A technology of subsynchronous oscillation and analysis method, which is applied in the field of subsynchronous oscillation analysis based on EEMD and Prony method, can solve the problems such as complex implementation process of filtering method, difficulty in providing non-stationary signal with noise, difficulty in selection of wavelet basis function, etc. , to achieve the effects of ensuring safety and economy, avoiding shaft damage, and strong noise resistance

Active Publication Date: 2022-04-19
HUANENG CLEAN ENERGY RES INST
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Problems solved by technology

[0004] The commonly used processing method is to filter the signal, but this requires knowing some characteristics of the signal denoising methods: such as Kalman filtering and Wiener filtering, etc., Kalman filtering needs the oscillation characteristics of the signal when establishing a system model, which is important for The non-stationary signal of noise is difficult to provide, and the implementation process of these filtering methods is complicated; the method of denoising the signal by using wavelet decomposition has also been applied, but the selection of wavelet basis function is a difficult point

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  • An Analysis Method of Subsynchronous Oscillation Based on EEMD and Prony Method
  • An Analysis Method of Subsynchronous Oscillation Based on EEMD and Prony Method
  • An Analysis Method of Subsynchronous Oscillation Based on EEMD and Prony Method

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[0040] The present invention will be further described in detail with the accompanying drawings and specific embodiments below, which are explanations rather than limitations of the present invention.

[0041]For a 330MW air-cooled turbogenerator set, the natural frequency of the first-order torsional vibration of the shafting is 18.74Hz, and the natural frequency of the second-order torsional vibration is 28.07Hz. The equivalent diagram of the power system where the unit is located is figure 2 , the unit to be studied is used as a supporting power source for an UHV DC transmission project, and the distance between the unit and the ±800kV converter station is about 38km. Due to the short distance between the unit and the converter station, and a large proportion of new energy generating units connected to the grid in the transmission line, the There is an increased risk of subsynchronous oscillations for the turbogenerator set under study.

[0042] The subsynchronous oscillat...

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Abstract

The invention discloses a subsynchronous oscillation analysis method based on EEMD and Prony methods, and belongs to the technical field of subsynchronous oscillation of power systems. First, EEMD is used to decompose the noise-containing signal to remove the high-frequency noise component, and at the same time, the modal mixing problem in EMD denoising is effectively solved. After obtaining a stable signal, Prony can be used to accurately identify the characteristic parameters of subsynchronous oscillation. The combination of concentrated empirical mode decomposition (EEMD) denoising and Prony identification effectively solves the mode superposition problem in EMD. Since the Prony method is sensitive to noise signals, the denoised signal is more accurate using Prony identification. Being able to identify the dominant mode of the subsynchronous oscillation is crucial to analyzing the source of the oscillation and proposing suppression measures, and has the advantages of strong noise immunity and high accuracy.

Description

technical field [0001] The invention belongs to the technical field of power system subsynchronous oscillation, and in particular relates to a subsynchronous oscillation analysis method based on EEMD and Prony methods. Background technique [0002] As the installed capacity of the turbogenerator increases, the length of the rotor gradually increases; in addition, the series compensation device or the form of high-voltage direct current transmission used for long-distance power transmission will increase the risk of subsynchronous oscillation of the unit [0003] The analysis methods of subsynchronous oscillation mainly include signal analysis method based on measured data, which is a commonly used method in subsynchronous oscillation mode identification, mainly including fast Fourier transform FFT, wavelet transform WT, Hilbert-Huang transform HHT and Prony In this method, FFT can accurately identify the main frequency of the linear stationary signal, but because FFT is an o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/17G06F111/10
CPCG06F30/20G06F30/17G06F2111/10
Inventor 赵鹏程王剑钊童彤王恩民任鑫王晨杨晓峰王华
Owner HUANENG CLEAN ENERGY RES INST
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