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Power grid abnormal state distinguishing method based on ring theory

A technology of abnormal state and discrimination method, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of slow recognition speed and waste of power system operation data, and achieve the effect of improving the discriminating speed and easy and intuitive judgment.

Inactive Publication Date: 2018-12-21
ELECTRIC POWER RES INST OF EAST INNER MONGOLIA ELECTRIC POWER +4
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Problems solved by technology

[0004] The present invention is mainly aimed at the existing abnormal state identification method, which is mainly driven by the physical model of the power grid, and the identification speed is relatively slow, and a large amount of power system operation data is wasted. Therefore, by using the ring theorem in the high-dimensional random matrix theory Identification of Abnormal State and Abnormal State Severity

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  • Power grid abnormal state distinguishing method based on ring theory
  • Power grid abnormal state distinguishing method based on ring theory
  • Power grid abnormal state distinguishing method based on ring theory

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Embodiment Construction

[0037] In conjunction with the accompanying drawings, the technical solutions involved in the present invention are further explained:

[0038] Step 1. In the model established by PSASP, the measurement data of n nodes is selected as the sample space, and k most critical state variables are selected for each node to be monitored, and a total of N=n×k state variables are formed. At each sample time t i , the measured data can form a column vector:

[0039] x(t i ) = [x 1 (t i ),x 2 (t i )...x N (t i )] T (1)

[0040] As the sampling time increases, N column vectors are expressed in the form of a matrix under the time series:

[0041] X=[x(t 1 ), x(t 2 ),...x(t i )...] (2)

[0042] In order to facilitate real-time calculation, the sliding time window is used to collect, and the window width is T, that is, while collecting the data at time i, make full use of the historical data with a length of T-1 before this time to form a random matrix:

[0043] x N×T =[x(t ...

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Abstract

The invention relates to a power grid abnormal state distinguishing method based on ring theory. The method comprises the following steps of: forming an original data matrix by utilizing WAMS (Wide Area Measurement System) data with processing of sliding time window and matrix standardization processing to obtain a high-dimensional random matrix for a ring theory; carrying out spectrum analysis research on the processed random matrix, and analyzing the processed random matrix from the ring theory; data is distributed between an outer ring and an inner ring when a system is in normal operation,and a large number of abnormal data points within the inner ring start to appear when the system starts to have an abnormal situation, therefore constructing a criterion of abnormal states by comparing a length of a minimum characteristic value with an inner ring radius; and judging the severity of the abnormal states according to the proportion of inner ring data points in a ring graph. According to the power grid abnormal state distinguishing method based on ring theory, power grid state is analyzed from a data driving perspective by using the WAMS data, an evaluation index of power grid abnormal state is constructed through the ring theory, so that the power grid abnormal state and the severity thereof can be quickly identified, and power big data is fully utilized.

Description

technical field [0001] The invention relates to a method for identifying an abnormal state of a power grid based on the ring theorem, in particular to a method for identifying an abnormal state of the power grid and the severity of the abnormal state of the power grid based on the ring theorem. Background technique [0002] In recent years, with the large-scale application of DC transmission and power grid, the operation of the entire power system has become more and more complex. How to quickly identify the abnormal state of the power grid deserves attention. At present, the most commonly used method for identifying the abnormal state of the power grid is to use the maximum power angle difference as a characteristic quantity to identify the abnormal state of the power grid. This method usually uses engineering experience. An abnormal state has occurred. There are also literatures that propose abnormal state discrimination methods based on the R-v phase plane and the δ-ω ph...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 陈肖璐龚庆武杨朋威韩英昆王建波郭俊英高贺卢健强刘天琪王波乔卉刘旭
Owner ELECTRIC POWER RES INST OF EAST INNER MONGOLIA ELECTRIC POWER
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