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System and method for judging negative damped oscillation and forced oscillation based on straight line method

A technology of negative damped oscillation and forced oscillation, applied in the field of power system, can solve problems such as negative damped oscillation and forced oscillation that have not yet been found

Inactive Publication Date: 2013-02-06
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the similarity between the two types of oscillations, there is no report on the method that can effectively distinguish between negatively damped oscillations and forced oscillations.

Method used

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  • System and method for judging negative damped oscillation and forced oscillation based on straight line method
  • System and method for judging negative damped oscillation and forced oscillation based on straight line method
  • System and method for judging negative damped oscillation and forced oscillation based on straight line method

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Embodiment

[0071] Below in conjunction with accompanying drawing, the patent of the present invention is described in further detail, but the present invention is not limited to the example given.

[0072] The software implementation method for distinguishing negatively damped oscillations and forced oscillations based on the straight line method consists of the following two parts:

[0073] Obtain the measured frequency and power oscillation curves through PMU or WAMS data, and directly use the measured signals (or process the low-frequency oscillation curve based on the PRONY method or HHT method) to obtain the curve signal of the dominant oscillation mode. The relevant content of this article is not within the scope of the present invention, and will not be discussed in detail.

[0074] A system for discriminating negatively damped oscillations and forced oscillations based on a straight line method, said method comprising the steps of:

[0075] (1). Obtain the measured oscillation c...

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Abstract

The invention provides a system and method for judging negative damped oscillation and forced oscillation based on a straight line method. Through data of a PMU ((Power Management Unit) or WAMS (Wide Area Measurement System), an electromechanical quantity which is close to the stability of a power system is selected, whether certain low-frequency oscillation is a negative damped low-frequency oscillation caused by damping insufficiency or a forced oscillation caused by a forced disturbance source existing in a system can be rapidly recognized within scores of initial cycles, so that a measure for inhibiting low frequency oscillation is rapidly taken.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a system and method for judging negative damping oscillation and forced oscillation based on a straight line method. Background technique [0002] With the deepening of the marketization process of the power industry, the power system is increasingly operating at its limit, and the low-frequency oscillation problem is a common technical problem faced by domestic and foreign power grids. Low-frequency oscillation has low frequency, wide oscillation range, and long oscillation duration, which poses a huge threat to the security and stability of the power grid. There are two main reasons for low-frequency oscillation. One is negative damping low-frequency oscillation. Negative damping oscillation is a process of gradual increase in amplitude. If there is no human intervention, the amplitude of oscillation will continue to increase. Instability; the other is low-frequency os...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 刘增煌贾文双李莹李文锋陶向宇王官宏何凤军朱方
Owner CHINA ELECTRIC POWER RES INST
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