Power grid risk prevention and control system based on cascading failure sequence

Abstract

The invention discloses a power grid risk prevention and control system based on a cascading failure sequence. The power grid risk prevention and control system comprises a comprehensive importance unit, an accident severity unit and an accident risk assessment unit. The comprehensive importance unit is used for establishing the comprehensive importance factor of each element according to the structure importance factors and the state sensitivity factors of the elements in a power grid; the accident severity unit is used for carrying out processing according to the comprehensive importance factor, obtained by the comprehensive importance unit, of each element, the severity factor of the power grid running state and the severity factors of the load loss and then obtaining the comprehensive severity factor after a power grid accident. The accident risk assessment unit is used for conducting calculating according to the comprehensive severity factor to obtain the accident risk assessment factor. The power grid risk prevention and control system can completely represent the importance of different elements in the power grid and is close to the power grid practice, a risk assessment result is more reliable and more accurate, and therefore the extra manpower and material resource loss is reduced.

Description

technical field [0001] The invention belongs to the field of power grid risk prevention and control, and in particular relates to a power grid risk prevention and control system based on cascading fault sequences. Background technique [0002] The frequent accidents in the power system in recent years show that a single component failure may spread rapidly along the power grid and trigger a series of chain reactions, which will eventually lead to system disconnection and catastrophic accidents. [0003] There have been many research results on the identification of cascading fault sequences, such as "Prediction of Cascading Faults Based on Power Grid State and Structure" (Wang Yimiao, Li Huaqiang, Xiao Xianyong, Liao Yuanxi. Prediction of Cascading Faults Based on Power Grid State and Structure. Power System Protection and Control, 2012, 40(20): 1-5), the power grid risk prevention and control technology based on cascading fault sequences came into being. [0004] On the ba...

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Problems solved by technology

[0004] On the basis of identifying the cascading failure sequence, carry out risk assessment on the cascading sequence of failures, and establish a catastrophic accident risk assessment model considering conditional probability based on complex network theory and risk theory, the paper "Catastrophic Accident Risk Based on Complex Network Theory and Conditional Probability" Evaluation Method" (Zhao Yang, Li Huaqiang, Wang Yimiao, Liu Peiqing. Catastrophic accident risk assessment method based on complex network theory and conditional probability. Power Grid Technology, 2013, 37(11): 3190-3196) The introduction of numerical factors into the risk assessment overcomes the shortcomings of the traditional risk assessment, where the severity of accidents only considers the operation status of the power grid and does not consider the structure of the power grid

[0005] In the existing risk assessment method, the physical structure of the power grid is considered, but the importance of different components cannot be fully represented, so the assessment results cannot accurately reflect the reality of the current network, and additional human and material resources will be lost during the implementation process

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