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Online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis

A wavelet multi-resolution, power grid technology, applied in the direction of electrical components, circuit devices, information technology support systems, etc., to achieve the effect of improving identification efficiency and facilitating online implementation

Active Publication Date: 2014-12-10
TSINGHUA UNIV +1
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Problems solved by technology

Wavelet multi-resolution analysis is a very promising method in the field of dynamic disturbance accident identification, which can realize engineering applications, but problems such as the selection of wavelet functions and the determination of the number of decomposition layers still need to be solved urgently

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  • Online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis
  • Online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis
  • Online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis

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Embodiment Construction

[0037] The online identification and visualization method of power grid disturbance based on wavelet multi-resolution analysis proposed by the present invention is described in detail in conjunction with the accompanying drawings and embodiments as follows:

[0038] The technical characteristics of the method of the present invention are that the size of the wavelet coefficient obtained by the online wavelet multi-resolution analysis is used to estimate the disturbance source, the positive and negative values ​​of the wavelet coefficient amplitude are used to roughly distinguish the disturbance type, and finally the identification result is visually displayed.

[0039] The method for online identification and visualization of power grid dynamic disturbance accidents based on wavelet multi-resolution analysis proposed by the present invention includes the following steps:

[0040] 1) Perform off-line simulation analysis of typical dynamic disturbance accident characteristics com...

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Abstract

The invention relates to an online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis, which belongs to the technical field of wide-area dynamic monitoring and visualization of power systems. The method comprises the following steps: carrying out offline simulation analysis on the features of typical dynamic disturbance accidents in power grid, and selecting a wavelet function Psi and the decomposition layer-number I corresponding to the obtained maximum wavelet coefficient energy as online wavelet multi-resolution analysis tools; carrying out regionalization according to the PMU (power management unit) configuration situation of a target power grid, so that each region has one and only one PMU substation for measurement, and transmitting frequency signals measured by each PMU substation to a WAMS (wide area measurement system) master station; acquiring frequency signals of each PMU substation from the WAMS master station, and carrying out I-layer online wavelet multi-resolution analysis on the frequency signals by using the determined wavelet function so as to obtain wavelet coefficients of an I(th) layer; and discriminating disturbance occurrence time, disturbance occurrence potion and disturbance type according to the wavelet coefficients; and carrying out visualized display through taking a map as the background. The method disclosed by the invention can improve the running reliability of an electrical power grid.

Description

technical field [0001] The invention belongs to the technical field of wide-area dynamic monitoring and visualization of electric power systems, and in particular relates to an online identification and visualization method of power grid disturbance based on wavelet multi-resolution analysis. Background technique [0002] After years of technical accumulation, the synchrophasor measurement technology has been gradually industrialized. More and more phasor measurement units (Phasor Measurement Units, PMUs) have been put into power grid operation. With the gradual improvement of PMU layout and high-speed power communication network with optical fiber and broadband digital microwave as the backbone, it is possible to realize the dynamic process of the power grid. real-time monitoring. The wide area measurement system (Wide Area Measurement System, WAMS) based on the PMU has been built and put into operation in various power grids at home and abroad, realizing the leap from ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J13/00
CPCY04S10/40
Inventor 程林陈刚孙元章张放林成赵维兴唐建兴王国松马覃峰
Owner TSINGHUA UNIV
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