Method for judging negatively-damped oscillation and forced oscillation on basis of straight line method

A technology of negative damping oscillation and forced oscillation, which is applied in the direction of reducing/preventing power oscillation, instrumentation, measuring electricity, etc. It can solve the problems of negative damping oscillation and forced oscillation method that have not been found yet, and achieve the effect of easy implementation and high accuracy

Inactive Publication Date: 2013-02-13
CHINA ELECTRIC POWER RES INST +1
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  • 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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  • Method for judging negatively-damped oscillation and forced oscillation on basis of straight line method
  • Method for judging negatively-damped oscillation and forced oscillation on basis of straight line method
  • Method for judging negatively-damped oscillation and forced oscillation on basis of straight line method

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Embodiment Construction

[0028] The technical solution adopted by the present invention to solve its technical problems specifically includes the following parts:

[0029] (1) Electrical quantity characteristics in the process of low-frequency oscillation

[0030] When low-frequency oscillation occurs in the power system, the rotor angle, speed, and related electrical quantities of the generator, such as line power, bus voltage, etc., will undergo oscillations of approximately equal amplitude or increased amplitude, and the oscillation frequency is relatively low, generally between 0.1-2.5 Hz or so.

[0031] Let the angular frequency be ω d The oscillation mode of is a negative damping (or weak damping) oscillation mode in the power system. The response of the power system after a disturbance is determined by the forced (steady-state) component x=x 0 and free components composition

[0032]

[0033] The amplitude of the Nth and N+1 times of the free component can be expressed as:

[0034] ...

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Abstract

The invention provides a method for judging negatively-damped oscillation and forced oscillation on the basis of a straight line method. The method comprises the steps: (1) acquiring an actually-measured oscillation curve; (2) selecting the maximum moment point in each oscillation period for analysis; (3) confirming the oscillation as increasing oscillation; (4) selecting two points, the spacing of which is greater than four oscillation periods, to form a linear equation; and (5) calculating difference to numerical values on the straight line and the actually-measured curve at the same one time point one by one, and judging the type of oscillation according to the obtained result. According to the method for judging negatively-damped oscillation and forced oscillation on the basis of the straight line method, through the data of a PMU (Power Management Unit) or a WAMS (Wide Area Measurement System), that certain low-frequency oscillation is of low-frequency negatively-damped oscillation caused due to damp lack of the system, or the forced oscillation caused due to a forced disturbance source existing in the system can be judged so as to fast take measures to restrain the low-frequency oscillation.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for distinguishing negative damped oscillations and forced oscillations 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 oscil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R19/12G01R19/2506H02J3/24G01R19/2513Y02E60/00Y04S10/00Y04S10/22Y02E40/70H02J3/241H02J3/242
Inventor 刘增煌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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