A method and system for extracting the static stability boundary characteristics of a large power network based on a spatio-temporal sequence

Abstract

The invention provides a method and system for extracting the static stability boundary characteristics of a large power network based on a spatio-temporal sequence, belonging to the field of safe andstable operation of the large power network. The method of the invention comprises the following steps of collecting static stable boundary holographic sample data; selecting static and stable boundary sample data. mapping the static stable boundary sample data to three sample images; calculating the Gaussian difference scale space of that three sample picture by extracting the features of the source sample picture, the net sample picture and the charge sample picture based on the scale invariant characteristic transformation method; carrying out the feature matching between the boundary loadsample image and the boundary net sample image; extracting the sample charge-network static stable boundary characteristics. The method of the invention avoids the shortcomings of less actual operation data and small working condition coverage, and the obtained static stable boundary characteristics are more convincing.

Description

Technical field [0001] The invention relates to the field of safe and stable operation of large power grids, and in particular to a method and system for extracting static and stable boundary features of large power grids based on time-space sequence. Background technique [0002] With the development of the economy, the electricity load continues to increase, and the grid is constantly approaching its transmission capacity limit, and the safe and stable operation of the power system is constantly challenged; new energy and power electronic equipment are connected to the grid on a large scale, and the uncertainty seriously affects the grid Safe and stable operation capability, and there have been many large-scale power outages worldwide. These all put forward urgent technical requirements for the extraction of the boundary features of the power system. [0003] Most of the traditional static stability assessment studies or stability boundary studies only give the static stability ...

AI Technical Summary

Problems solved by technology

Most of its research methods are aimed at physical models and high-intensity simulation calculations. Traditional models are difficult to adapt to the current power system, resulting in differences between the conclusions drawn and the actual operating status of the power system, and its online engineering applicability cannot be guaranteed.

Most of the research on the static stability boundary is based on the voltage characteristics, and the comprehensiveness of the analysis cannot be guaranteed

At present, there are many indicators for the determination of static stability, but most of them can only reflect a certain side of the power grid (for example, the voltage stability index only reflects the voltage level of the power grid, and the power angle stability index only reflects the operating state of the generator), which cannot Examine the overall state of the power grid from a macro perspective

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