Power system dynamic security assessment comprehensive model and spatiotemporal visualization method

Abstract

The invention provides a power system dynamic security assessment comprehensive model and a spatiotemporal visualization method. The method comprises the following steps: constructing a dynamic security index and establish an initial sample set for dynamic security assessment based on the historical operation data of a power system and a predicted accident set; 2) constructing a feature selectionframework, performing feature selection on the initial sample set and forming a processed high-efficiency sample set; 3) constructing an online dynamic security assessment comprehensive model based ona random bit forest and performing offline training and updating on the model by using the high-efficiency sample set; and 4) using the continuously updating dynamic security assessment model to complete the online assessment of the dynamic security state and using the spatiotemporal visualization method to realize the visual presentation of the dynamic security information. The purpose of the present invention is to provide the online dynamic security assessment comprehensive model and the spatiotemporal visualization method which are beneficial to the system operators to take timely preventive and control measures, avoid large power outage caused by accidents and improve the secure operation level of the power grid.

Description

technical field [0001] The invention relates to the field of dynamic security assessment of electric power systems, in particular to a comprehensive model and space-time visualization method for dynamic security assessment of electric power systems. Background technique [0002] On the one hand, with the popularization of new energy in the power system and the interconnection of large-scale power grids across regions, the safe operation of modern power systems is facing major challenges. The operating environment of the power system is complex and changeable, and potential emergencies increase the dynamic unsafe risk of the power grid. On the other hand, with the development of smart grid and wide-area measurement system, to make full use of the continuously accumulated and updated power system operation data, the dynamic security assessment method is required to have wider applicability and fast data processing speed. Therefore, the study of dynamic security assessment met...

AI Technical Summary

Problems solved by technology

[0004](1) The traditional mechanism analysis method is mainly based on offline analysis, which has a large amount of calculation, high computer time consumption, and is difficult to meet the requirements of real-time dynamic security assessment for calculation speed. Provides stability margin information and many other deficiencies;

[0005](2) Traditional data-driven methods have many limitations when they are directly used to process large-scale data of modern power grids, and often have not considered the possible impact on dynamic security assessment Affected by various influencing factors in the operation of the power system and the efficiency of the training sample set, the dynamic security assessment results are not intuitive, and cannot provide visual dynamic security information

[0008]① The dynamic safety degree of the power system cannot be seamlessly given according to the real-time operation information of the power system;

[0009]② Unable to provide quantitative dynamic security information for the global or local areas of the power system;

[0010]③ Unable to provide power system operators with a visual dynamic safety monitoring map

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