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

A wavelet multi-resolution, power grid technology, applied in electrical components, circuit devices, information technology support systems, etc., to achieve the effect of improving identification efficiency and facilitating online implementation
CN102931728AActive Publication Date: 2013-02-13TSINGHUA UNIV +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2013-02-13

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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.
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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) are put into power grid operation. With the gradual improvement of PMU layout, and the high-speed power communication network with optical fiber and broadband digital microwave as the backbone, it can realize the dynamic process of the power grid. real-time monitoring. Various power grids at home and abroad have built and put into operation PMU-based Wide Area Measurement System (Wide Area Measurement System, WAMS), which has realized the leap from steady-state monitoring ...

Claims

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