Node importance-based power grid key node assessment method

Abstract

The invention discloses a node importance-based power grid key node assessment method. According to the method, power grid key nodes are identified and protected emphatically, so that the method has an important significance on the prevention of significant power failure accidents. In the prior art, no simple and practical comprehensive evaluation method is available. On this background, firstly, an improved electrical distance is defined based on a power transfer distribution factor (PTDF). Secondly, the efficiency of a node and the initial weight of the node are defined. Thirdly, a method for constructing a node importance contribution coefficient matrix and a node importance contribution matrix is provided. On the above basis, a calculation method for calculating the node importance of a power grid is given. Therefore, the key nodes of a regional power grid can be recognized. Based on the method, the key nodes of the regional power grid can be recognized effectively and in real time according to the operation condition of the power grid. Therefore, the method meets actual engineering requirements and is a practical assessment method for the comprehensive assessment of the key nodes of the power grid.

Description

technical field [0001] The invention relates to the field of power system emergency response, in particular to a method for evaluating key nodes of a regional power grid. Background technique [0002] Large-scale power outages caused by extreme weather occur from time to time. These large-scale blackouts have sounded the alarm for the safe and stable operation of the power system, and have also prompted people to put forward higher requirements for the operation of the power grid. Large-scale power outages often originate from the malfunction of relay protection equipment or the successive failures of a small number of components, and are closely related to the weak links in the power system during the expansion stage of the accident. Traditional power grid security analysis methods are based on reductionism and deterministic principles, and it is difficult to reasonably explain the internal mechanism of such large-scale power outages caused by small faults. [0003] With t...

AI Technical Summary

Problems solved by technology

However, in the process of identifying key nodes, these derivative methods do not reflect the influence of the importance of the node itself on its importance, and often consider the connection between nodes to be indifferent, and also imply the connection between node pairs are based on the assumption that the shortest path

[0005] At present, there have been many related researches at home and abroad on the identification of key nodes in the power grid, but most of the existing research is based on the topological relationship between nodes and transmission lines when identifying key nodes in the power grid, and seldom considers Kiel when considering the power flow between nodes. Hough's law, so there is still a large gap between the obtained results and the actual situation of the power grid

At the same time, some recognition methods also have the disadvantages that the calculation process is relatively complicated and time-consuming

Images