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A Method for Extracting Parameters of Low-Frequency Oscillation Rapidly Decaying Signal Components

A technology of attenuating signals and low-frequency oscillations, which is applied in the field of extraction of parameters of low-frequency oscillations rapidly attenuating signal components, to achieve good reflection, improve calculation accuracy, and high accuracy

Inactive Publication Date: 2018-08-14
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

[0085] In order to solve the above-mentioned problems existing in the prior art, the present invention proposes a method for extracting the parameters of the fast-attenuation signal component of the low-frequency oscillation of the Prony method, so as to solve the problem of accurately extracting the fast-attenuation component in the low-frequency oscillation
[0086] In order to achieve the above object, the present invention proposes to adopt the Prony method segmentation analysis method to solve the problem of accurately extracting the fast decay component in the low frequency oscillation

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  • A Method for Extracting Parameters of Low-Frequency Oscillation Rapidly Decaying Signal Components
  • A Method for Extracting Parameters of Low-Frequency Oscillation Rapidly Decaying Signal Components
  • A Method for Extracting Parameters of Low-Frequency Oscillation Rapidly Decaying Signal Components

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[0115] The present invention will be further described below in conjunction with the accompanying drawings. use figure 1 The flow chart of the low-frequency oscillation analysis of the traditional Prony method, figure 2 The flow chart of the extended Prony method shown and image 3 The flow chart of the low-frequency oscillation analysis of the Prony method of the present invention is shown, and the following signals are analyzed.

[0116] x(t)=10e -0.0311t cos(2π×0.2473t+20°)+2e -0.2652t cos(2π×0.42t+13°)+

[0117] 10e -0.0027t cos(2π×0.423t+110°)+1e -0.2936t cos(2π×1.0349t+60°)+ (36)

[0118] 6.3e -55.1156tcos(2π×0.9t+60°)+5.8e -45.8788t cos(2π×2.4t+10°)

[0119] The above signal contains 6 sinusoidal components, which are equivalent to 12 complex exponential components. When using formula (1) to model the above signal, the actual order p of the signal model is 12. The parameters of the example signal are shown in Table 1, where the first four signal components a...

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Abstract

The invention discloses an extraction method for the Prony method low frequency oscillation rapid fading signal component parameter. The method includes the following steps of reading in filtered measurement data, dividing time periods, analyzing a slow fading signal component parameter in the second time period, regulating the slow fading signal component parameter, analyzing the rapid fading signal component parameter in the first time period, and outputting the analysis result. The sampling time period is divided into the two time periods, slow fading component parameter during low-frequency oscillation is calculated in the second time period, the rapid fading component parameter is calculated in the first time period, rapid fading component information can be effectively extracted, and meanwhile the calculation precision of the slow fading component information can be improved. The accuracy of calculated frequencies, fading factors, amplitude values and primary-phase parameters of all signal components in low-frequency oscillation is high, the characteristics of low-frequency oscillation can be better reflected, and reliable foundation is provided for taking measures to restrain low-frequency oscillation.

Description

technical field [0001] The invention relates to a calculation method of Prony method low-frequency oscillation in a power system, in particular to a method for extracting parameters of the Prony method low-frequency oscillation fast-attenuation signal component. Background technique [0002] When the power system is running, low-frequency oscillations with a frequency of 0.1 Hz to 2.5 Hz will occur due to disturbances, which seriously affect the stability of the power system and endanger the safe operation of the power grid and its related equipment. Therefore, it is necessary to closely monitor the possible low-frequency oscillation phenomenon and deal with it in time to prevent the consequences of destroying the stability of the system. Prony analysis is currently one of the most commonly used and most effective methods for analyzing low-frequency oscillations. By performing Prony analysis on signals, parameters such as amplitude, phase, frequency, and attenuation factors ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 姚玉斌王延勃韩兴启王莹
Owner DALIAN MARITIME UNIVERSITY
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