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Method and device for identifying low-frequency oscillation mode parameters of power system

A low-frequency oscillation and modal parameter technology, which is applied in the direction of reducing/preventing power oscillation, can solve the problems of poor non-stationary signal processing and inability to effectively identify oscillation modal parameters, etc.

Active Publication Date: 2013-06-19
WUHAN UNIV +1
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Problems solved by technology

[0003] The present invention mainly solves the technical problem that the current low-frequency oscillation research method in the prior art has poor effect on nonlinear and non-stationary signal processing in low-frequency oscillation of the power system, and cannot effectively identify oscillation modal parameters, etc.; it provides A power system low-frequency oscillation modal parameter identification method and its device that can effectively identify the low-frequency oscillation modal parameters of the power system, including amplitude, attenuation coefficient, frequency, damping ratio, phase, start and end time

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  • Method and device for identifying low-frequency oscillation mode parameters of power system
  • Method and device for identifying low-frequency oscillation mode parameters of power system
  • Method and device for identifying low-frequency oscillation mode parameters of power system

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Embodiment

[0029] A method for identifying modal parameters of low-frequency oscillations in power systems, based on an attenuated sine quantity model , where the six parameters are expressed as: is the amplitude of the decaying sine, is the frequency, is the attenuation coefficient, for the phase, and are the start and end moments of the attenuation component, respectively, is a unit step function, characterized in that it includes the following steps:

[0030] In step 1, the initial signal is obtained by the parameter acquisition unit and the parameters of the first atom are obtained from the Gabor atom library, that is, the above six parameters; the parameters of the first atom are obtained using a matching pursuit algorithm.

[0031] In step 2, the inherent parameter identification unit optimizes the six parameters in step 1 and identifies the inherent parameters; the optimization process adopts the optimization of the pseudo-Newton method, and the identification of th...

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Abstract

The invention relates to a method and device for identifying the low-frequency oscillation mode parameters of a power system. In the invention, a novel method for analyzing a nonlinear and non-stationary signal, namely, an atomic sparse decomposition method, is creatively used for identifying the low-frequency oscillation mode parameters. By the method, the low-frequency oscillation mode parameters, such as an amplitude, an attenuation coefficient, a frequency, a damping ratio, a phase position, start time and end time, of the power system can be effectively identified. The invention has the advantages that the novel method for analyzing the nonlinear and non-stationary signal, namely, the atomic sparse decomposition method, is used for effectively identifying the low-frequency oscillation mode parameters including the amplitude, the attenuation coefficient, the frequency, the damping ratio, the phase position, the start time and the end time of the power system.

Description

technical field [0001] The invention relates to a low-frequency oscillation modal parameter identification method and a device thereof, in particular to a power system low-frequency oscillation modal parameter identification method. Background technique [0002] With the construction of domestic UHV large power grid interconnection and the construction of demonstration projects such as west-to-east power transmission and AC-DC hybrid transmission, the scale and complexity of the system are increasing, and the power exchange between regions is becoming more and more frequent. appears to be particularly important. Low-frequency oscillation is an inherent phenomenon of networked systems. The stability of its oscillation is a prerequisite for ensuring the safe operation of the system and has become the primary factor affecting the stable operation of the system. The current low-frequency oscillation research methods are not effective for the nonlinear and non-stationary signal ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
Inventor 龚庆武李勋乔卉贾晶晶
Owner WUHAN UNIV