Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com