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Detection method and device of low frequency oscillation of electric power system

A power system, low-frequency oscillation technology, applied in the recognition of patterns in signals, instruments, characters, and pattern recognition, etc., can solve the problems of complex computing of general methods, and achieve the effects of high practical value, improved success rate, and simple algorithm.

Inactive Publication Date: 2016-12-07
XUJI GRP +3
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for detecting low-frequency oscillations in power systems, which is used to solve the problem of complex calculations in existing general methods

Method used

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  • Detection method and device of low frequency oscillation of electric power system
  • Detection method and device of low frequency oscillation of electric power system
  • Detection method and device of low frequency oscillation of electric power system

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Embodiment Construction

[0042] An embodiment of a method for detecting low-frequency oscillations in a power system of the present invention,

[0043] The detection method of the power system low-frequency oscillation of the present invention comprises the following steps:

[0044] S1. Convert the power frequency signal collected on the power system line into a power curve;

[0045] S2. Calculate the extreme value of the power curve, and judge the peak and valley points;

[0046] S3. For the set frequency band, find the half-period range and full-period range corresponding to the set frequency band, and calculate a cycle of the low-frequency component to be detected: when a peak / trough B is detected k After that, judge in B k push back the presence of troughs / peaks within the half-period range associated with B j , if present, then in B k Push back the entire period to determine whether there is a peak / trough B L , if present, with B k , B j , B L The determined signal is a cycle of the low f...

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Abstract

The invention discloses a detection method and device of low frequency oscillation of an electric power system. The method comprises steps of firstly converting a power frequency signal collected by the electric power system into a power curve; calculating the extreme value of the power curve and determining a wave crest point and a wave trough point; calculating a half period range and a whole period range corresponding to a set frequency range, calculating a cycle of a to be detected low frequency component, after a wave crest / wave trough Bk is detected, determining whether a wave crest / wave trough Bj exists or not within the range of a half period after the Bk, determining whether a wave crest / wave trough BL exists or not within the range of a whole period after the Bk if the wave crest / wave trough Bj exists within the range of the half period after the Bk, and taking a signal determined by the Bk, Bj and BL as a cycle of the to be detected low frequency component if the wave crest / wave trough BL exists within the range of the whole period after the Bk; and finally calculating the frequency and the amplitude of the to be detected low frequency component By the abovementioned processes, the invention achieves objects of reducing the operand and saving the operation time.

Description

technical field [0001] The invention relates to the field of automation of electric power systems, in particular to a method and device for detecting low-frequency oscillations of electric power systems. Background technique [0002] With the expansion of the scale of grid interconnection, the widespread adoption of high-magnification fast excitation technology, and the operation of the grid under the influence of economical and environmental factors is closer to the stability limit, many accidents related to low-frequency oscillation have occurred worldwide. , has a serious adverse effect on the safe and stable operation of the system. [0003] The main reason for the low-frequency oscillation is that when the generators are running in parallel in the power system, the relative swing between the rotors of the generators occurs under the disturbance, and the continuous oscillation is caused by the lack of damping. It can be roughly divided into local mode oscillation and in...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06Q50/06
CPCG06Q50/06G06F2218/10
Inventor 牟涛王晓峰余高旺杨智德李刚赵应兵金全仁李贞
Owner XUJI GRP
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