S-transform and 2DPCA-combined coherent unit grouping method and system

A unit and coherent technology, applied in the direction of instruments, biological neural network models, data processing applications, etc., can solve problems such as low efficiency and accuracy, complex calculations, etc., and achieve the effects of easy operation, simplified power grid, and comprehensive feature extraction

Active Publication Date: 2018-01-16
STATE GRID FUJIAN ELECTRIC POWER CO LTD +4
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[0005] The purpose of the present invention is to provide a method and system for grouping of coherent units combining S-

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  • S-transform and 2DPCA-combined coherent unit grouping method and system
  • S-transform and 2DPCA-combined coherent unit grouping method and system
  • S-transform and 2DPCA-combined coherent unit grouping method and system

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[0041] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0042] The present invention proposes a coherent machine group grouping method combining S-transform and 2DPCA. The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] like figure 1 As shown, it is a flow chart of the identification method of coherent unit combining fast S-transformation and 2DPCA, including the following steps:

[0044] Step S1: Obtain power angle information increments of M generators after faults by the synchrophasor measuring device, and the dimension is N to obtain an N×M dimensional power angle information database δ.

[0045]Step S2: According to the power angle information increment of each generator obtained in step S1, the corresponding power angle rocking curve information is obtained, and S transformation is performed to obtain a...

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Abstract

The present invention relates to an S-transform and 2DPCA-combined coherent unit grouping method and system. According to the method and system, a WAMS phasor measurement device is utilized to obtainthe real-time power angles of the units of a system; fast S-transform is adopted to convert the power angle signals of each generator to a time-frequency feature modulus matrix; the 2DPCA is adopted to perform dimensionality reduction on the time-frequency feature modulus matrix so as to convert the time-frequency feature modulus matrix into a low-dimensional feature index matrix; and the featureindex matrix is inputted to a self-organizing neural network for clustering and recognition. With the method and system of the present invention adopted, online unit grouping can be performed on the system in real time under different operation modes according to the change of different faults and different fault locations, and the time-frequency domain information of the power angles is comprehensively considered. The method and system have the advantages of high recognition accuracy and stable clustering results. With the method and system adopted, necessary premises can be provided for thesimplification of a power grid, the determination of the oscillation center of the system and islanding control, and the safe, efficient and stable operation of the power grid can be ensured.

Description

technical field [0001] The invention relates to the technical field of coherent unit identification, in particular to a coherent unit grouping method and system combining S transform and 2DPCA. Background technique [0002] With the implementation of the "West-to-East Power Transmission, North-South Interconnection" project, the national power grid is developing towards the direction of large-scale interconnection. However, while economic benefits are improving, power grid security issues are becoming more and more prominent. Small disturbances may cause cascading failures and lead to large-scale power outages. Active decoupling control is the last link to avoid power grid paralysis, and the search for decoupling sections needs to be based on accurate coherent grouping of units. In addition, with the expansion of the grid scale, the system failure modes are diverse, and the system equivalent to a single infinite system or a two-machine system in fault analysis cannot fully ...

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06G06N3/02
Inventor 徐振华苏毅黄道姗程鑫苏清梅吴丹岳余秀月黄霆宋少群江伟仲悟之宋新立叶小晖王涛杨越赵存璞顾雪平
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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