Working condition On-line identification and early warning method of low frequency oscillation leading model of electric power system

A low-frequency oscillation, power system technology, applied in the direction of reducing/preventing power oscillation, can solve the problems of unable to give system mode information, unable to achieve all-weather "monitoring and early warning", etc., to achieve the effect of good practical application value and strong anti-noise performance

Inactive Publication Date: 2014-05-14
WUHAN UNIV
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Problems solved by technology

However, the above-mentioned identification methods all need to apply incentives to the system. They can only identify the system characteristics at that time after the system oscillates and issue an alarm. early warning

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  • Working condition On-line identification and early warning method of low frequency oscillation leading model of electric power system
  • Working condition On-line identification and early warning method of low frequency oscillation leading model of electric power system
  • Working condition On-line identification and early warning method of low frequency oscillation leading model of electric power system

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Embodiment Construction

[0048] The present invention processes non-stationary signals by means of ensemble empirical mode decomposition, uses filters, cross-correlation coefficients, and signal energy weight coefficients to filter out dominant mode components; uses natural excitation technology to find the cross-correlation function between dominant mode components, with the cross-correlation function as the dominant The pattern recognition signal uses the teager energy operator to identify the time-varying amplitude and frequency, the time domain peak-to-peak method is used to identify the phase, and the signal energy analysis method is used to identify the damping ratio and apply it to the online early warning of low-frequency oscillation dominant mode conditions.

[0049] The method of the present invention will be described in detail below.

[0050] The online identification and early warning method of the power system low-frequency oscillation dominant mode operating conditions of the present inventio...

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Abstract

The invention discloses a working condition on-line identification and early warning method of a low frequency oscillation leading model of an electric power system. A non-stationary signal is decomposed and handled by an ensemble empirical mode. By the adoption of a filter, a cross correlation coefficient and a signal energy weight coefficient, leading model components are screened out, a cross correlation function of the leading model components is obtained by a natural excitation technique, the cross correlation function is used as the leading model to identify signals, variable amplitudes and frequencies are identified by the adoption of a teager energy operator, phase positions are identified by the adoption of a time domain peak peak-value method, damping ratio is identified by the adoption of an energy analysis method and is applied to the working condition on-line early warning of low frequency oscillation leading model. The working condition on-line identification and early warning method has the advantages that the dynamic real-time leading model information of a system can be identified quickly and precisely and man-made excitation is not needed, and anti-noise performance is strong, and has an important meaning for maintaining a safe and stable on-line identification and early warning of the electric power system.

Description

Technical field [0001] The invention belongs to the technical field of power system low frequency oscillation online monitoring, and more specifically relates to an online identification and early warning method for power system low frequency oscillation dominant mode working conditions. Background technique [0002] With the continuous deepening of the national grid interconnection, the low-frequency oscillation of the power system has increasingly become one of the prominent problems that threaten the safe and stable operation of the power grid. When the system is disturbed, there will be relative swings between the generator rotors, and continuous oscillations occur when there is a lack of damping. The oscillations with a frequency between 0.1 and 2.5 Hz are called low-frequency oscillations. [0003] At present, low-frequency oscillations of power systems are generally analyzed based on the response trajectory after system disturbance. Commonly used analysis methods include Fou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 刘涤尘廖清芬汪颂军赵一婕王乙斐杨健涂炼朱振山
Owner WUHAN UNIV
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