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Low frequency oscillation distinguishing method based on response ingredient and oscillation characteristic identification

A technology of low frequency oscillation and discrimination method, which is applied in the direction of instruments, measuring devices, measuring electricity, etc., can solve the problem that the rationality of the discrimination principle is still in question, and achieves the effect of simple and clear principle and improved accuracy.

Active Publication Date: 2013-02-06
SHANDONG UNIV
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Problems solved by technology

It can be seen that the patent [Shi Bonian, Wu Xiaochen, Wu Jingtao, et al. Analysis method of low-frequency oscillation mechanism of power system based on signal oscillation mode identification: China, 201010581010.0 [P]. 2010-12-09.] is reasonable in discriminant principle sex is debatable

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  • Low frequency oscillation distinguishing method based on response ingredient and oscillation characteristic identification
  • Low frequency oscillation distinguishing method based on response ingredient and oscillation characteristic identification
  • Low frequency oscillation distinguishing method based on response ingredient and oscillation characteristic identification

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] Such as figure 1 as shown, figure 1 It is a flow chart of oscillation type discrimination; using the flow chart makes the steps of oscillation type discrimination in the content of the invention clearer and more intuitive, easy to understand and analyze, and figure 1 The labels ①~⑩ on the left side of the middle are in one-to-one correspondence with steps (1)~steps (10) in the summary of the invention, for figure 1 The content in can refer to step (1) ~ step (10), and will not be described in detail here.

[0035] Such as Figure 2~Figure 7 As shown, the horizontal axis represents the time t in seconds (s), and the vertical axis represents the electromagnetic power P of the generator e , is the p.u. value, and the unit is p.u.; the dotted line represents the actual measured results of each oscillation type, and the solid line represents the r...

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Abstract

The invention discloses a low frequency oscillation distinguishing method based on response ingredient and oscillation characteristic identification. The low frequency oscillation distinguishing method mainly comprises the following steps: selecting to-be-analyzed oscillation data; identifying response ingredients and oscillation characteristics; first distinguishing negative damping oscillation, ending if the oscillation is negative damping oscillation, or else performing distinguishing of resonance oscillation; if the oscillation is distinguished to be resonance oscillation in the distinguishing process of the resonance oscillation, and transferring to distinguishing of positive damping resonance and zero damping resonance; otherwise, transferring to distinguishing of positive damping free oscillation, performing distinguishing of zero damping equiamplitude free oscillation if the oscillation is not positive damping free oscillation, performing distinguishing of zero damping beat frequency oscillation if the oscillation is not distinguished to be zero damping equiamplitude free oscillation, performing distinguishing of positive damping beat frequency oscillation if the oscillation is not distinguished to be zero damping beat frequency oscillation, and ending. The low frequency oscillation distinguishing method has the advantages of being simple and clear in principle, distinguishing finely and being complete in criterion.

Description

technical field [0001] The invention relates to the technical field of electric power system and automation thereof, in particular to a low-frequency oscillation type discrimination method based on response component and oscillation feature identification. Background technique [0002] In recent years, many low-frequency power oscillation events have occurred in domestic and foreign power grids, which seriously threaten the safe and stable operation of the power grid and restrict the power transmission capacity of the power grid. There are mainly two mechanism explanations or two types of low frequency oscillations: free oscillation of negative damping mechanism and forced oscillation of resonance mechanism. The two oscillations are significantly different in the oscillation mechanism, cause, waveform and control measures. [0003] The main reason for the free oscillation is that the damping of the system oscillation mode is relatively weak or negative due to the fast excit...

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Application Information

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IPC IPC(8): G01R31/00
Inventor 叶华宋佑斌刘玉田
Owner SHANDONG UNIV
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