Method for harmonic identification based on generalized Kalman filter

A technology of Kalman filtering and identification method, applied in the direction of spectral analysis/Fourier analysis, etc., can solve the problem of harmonic identification without Kalman filtering

Inactive Publication Date: 2013-08-14
HARBIN ENG UNIV
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Problems solved by technology

The invention patent "A Waveform Reproduction Control Method of Electro-hydraulic Servo System Based on Kalman Filter" and the invention patent "A Random Vibration Control Method of Electro-hydraulic Servo System Based on Kalman Filter" are both Kalman filters in electro-hydraulic servo systems. The application in the servo system, but does not use the Kalman filter as the identification algorithm for harmonic identification, which is essentially different from the pres

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  • Method for harmonic identification based on generalized Kalman filter
  • Method for harmonic identification based on generalized Kalman filter
  • Method for harmonic identification based on generalized Kalman filter

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Embodiment

[0086] The sinusoidal input signal of the electro-hydraulic servo vibration table control system is 4sin(2π×5t)m / s 2 , at this time, the acceleration response signal of the vibrating table surface is very seriously distorted. Using a harmonic identification method based on generalized Kalman filter provided by the present invention to perform harmonic identification on the acceleration response signal, the following can be obtained: figure 2 The identification results of each harmonic amplitude shown in image 3 The phase identification results of each harmonic are shown.

[0087] The amplitude identification results and phase identification results of each harmonic are basically stable after 2 seconds, and the amplitude and phase fluctuations after stabilization are also very small.

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Abstract

The invention relates to the field of harmonic identification methods, in particular to a harmonic identification method used for harmonic identification in power systems or control systems. The method comprises the following steps: creating response signal non-linear state space model; and extracting state vector estimated value, harmonic amplitude and phase at k moment. The method for harmonic identification based on generalized Kalman filter can obtain accurate information of harmonic component in excitation response signal of simple harmonic wave in a fast and real-time manner, and can be applied to harmonic identification in power systems or control systems conveniently.

Description

technical field [0001] The present invention relates to the field of harmonic identification methods, in particular to a harmonic identification method used in power system harmonic identification or control systems. Background technique [0002] In the power system, harmonics are the distortion of voltage and current caused by load nonlinearity. Harmonics consume reactive power reserves, affect power metering, increase the loss of power transmission and utilization, overheat equipment, aggravate equipment aging and shorten the use of it. service life. The generated harmonic resonance will cause failure and damage of electrical components, seriously endangering the electrical environment. In terms of signal interference, harmonics will generate electromagnetic interference, reduce the communication quality of the communication system, cause malfunctions of important components and sensitive components, disrupt the normal operation of automatic control devices, and reduce re...

Claims

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Application Information

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IPC IPC(8): G01R23/16
Inventor 姚建均狄多涛姜贵林高爽严寒肖蕊
Owner HARBIN ENG UNIV
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