Substation operation risk evaluation method based on graph theory

Abstract

A substation operation risk evaluation method based on a graph theory comprises the following concrete steps: carrying out data input and constructing an input data module for substation operation risk evaluation; using an element outage model module to calculate the outage probability of substation elements; using a Monte Carlo module to simulate the randomness for the substation elements to exit operation so as to form a substation system state; identifying connectivity of the system state of the substation by a graph theory method and judging whether a load point is communicated with a power supply point; and evaluating a substation operation risk and calculating a corresponding substation operation risk index. According to the substation operation risk evaluation method of the invention, consideration is given to the randomness of substation events, the system state of the substation is extracted by a Monte Carlo method, the method of identifying the connectivity through the use of the graph theory is proposed, substation main wiring risk evaluation is converted into a problem of identification of connectivity between the load point and the power supply point inside the substation, the complexity of problem analysis is simplified, and the purpose of substation operation risk evaluation is achieved.

Description

technical field [0001] The invention belongs to the field of power system risk assessment, and in particular relates to a graph theory-based substation operation risk assessment method. Background technique [0002] As an important part of the power system, the substation is the main place for transforming voltage, receiving and distributing electric energy. Each voltage level is connected to a complete power grid through the substation, so that the investment and construction of the power grid can give full play to the advantages of the socialist market economy. Unify planning, layout and organization from the perspective of national resource allocation and development strategy. The outage of relevant equipment in the substation may cause some load points to lose connection with the substation, and even cause the entire substation to be out of service, causing power outages, resulting in corresponding economic losses and social impacts. [0003] At present, there are three...

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Problems solved by technology

Aiming at the limitations of the direct labeling method and the cut set theory method, the present invention proposes to use graph theory to solve the problem of electrical connectivity identification. Due to the clear physical concept of

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