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Disturbance source automated positioning method based on empirical mode theory

A technology of empirical mode and positioning method, applied in the field of power system, can solve the problems of inability to achieve accurate positioning, large calculation error of energy function method, etc. Effect

Active Publication Date: 2015-09-23
STATE GRID CORP OF CHINA +1
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Problems solved by technology

The electrical quantities collected in the actual system include components determined by disturbance sources and components determined by non-disturbance sources. When the components determined by non-disturbance sources play a large role, the calculation error of the energy function method will be large, and sometimes accurate positioning cannot be achieved.

Method used

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  • Disturbance source automated positioning method based on empirical mode theory
  • Disturbance source automated positioning method based on empirical mode theory
  • Disturbance source automated positioning method based on empirical mode theory

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Embodiment

[0061] Below to figure 2 The present invention is further described in detail by taking an oscillation example of an actual power grid as an example, but the present invention is not limited to the given example. Under the island operation mode of the DC sending end system of a certain power grid, the system has abnormal power and frequency oscillations, and the PMU recording waves during the oscillation process are as follows: figure 2 shown. Accident analysis and field test verification work show that the cause of power oscillation is the system forced oscillation phenomenon caused by the problem of the speed control system of GD power plant.

[0062] Using the method provided by the present invention to perform disturbance source location analysis on the initial oscillation data, the steps are as follows:

[0063] Step 1: Collect the electric power and angular frequency of each branch in the power grid, such as figure 2 shown;

[0064] Step 2: Calculate the dominant ...

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Abstract

The present invention relates to a disturbance source automated positioning method based on the empirical mode theory. The method comprises the steps of (1) collecting the electric power and angle frequency of each branch in a power grid, (2) calculating the dominant component capable of reflecting the characteristic of a disturbance source, (3) calculating empirical mode energy flows V(1)(t), (4) fitting an upper envelope line V1(t) and a lower envelope line V2(t) according to the maximum and minimum values of the empirical mode energy flows, (5) calculating an empirical mode energy trend function V0(t), (6) calculating a disturbance source identification indicator Ab, and (7) according to the disturbance source identification indicator Ab, carrying out automated positioning on the disturbance source. According to the method provided by the invention, the accuracy of disturbance source identification can be improved, the automatic identification of the disturbance source can be realized, and the method has strong engineering practicality.

Description

technical field [0001] The invention relates to the field of power systems, in particular to an automatic disturbance source positioning method based on empirical mode theory. Background technique [0002] With the development of large-scale interconnected power systems, the problem of forced power oscillation in power systems has attracted more and more attention. Forced oscillation has the characteristics of fast start-up, continuous synchronous oscillation with equal amplitude after start-up, and rapid attenuation after the oscillation source is eliminated. Therefore, if the location of the disturbance source can be accurately found, it is of great significance for eliminating oscillation and restoring system stability. . [0003] At present, some scholars have carried out the research on the location method of the disturbance source, and the energy function method is one of the main methods used for the location of the disturbance source of the forced oscillation. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 褚晓杰高磊印永华李文锋易俊张健卜广全郭剑波
Owner STATE GRID CORP OF CHINA
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