A method of grid chain failure based on improving OPA model

Abstract

The invention discloses a power grid cascading failure determination method based on the improved OPA model, which belongs to the field of electrical engineering. The invention uses the optimal power flow model to calculate the system power flow distribution in the fast dynamic process of the OPA model, and uses the generated betweenness index to minimize the failure due to the removal of the system. The loss caused by the load to the connectivity of the power grid; the topology evolution model of the power grid is obtained from the evolution mechanism of the power grid itself, and mainly studies the construction timing, site selection, capacity, and access to the power grid of new substations and power plants. It well reflects the evolution law of power grid topology; it uses the idea of ​​difference planning when simulating power grid upgrade and line transformation, and expands and transforms key lines to ensure continuous power supply of important loads; compared with the original OPA model, this The improved model in the invention is more formal, comprehensive and more in line with the actual situation in simulating the cascading faults of the power grid and the evolution process of the power grid upgrade.

Description

technical field [0001] The invention belongs to the field of electrical engineering, and in particular relates to a method for determining cascading failures of a power grid based on an improved OPA model. Background technique [0002] The cross-regional interconnected power grid has developed into one of the most complex man-made industrial networks. In recent years, many blackouts at home and abroad are caused by grid cascading failures. Therefore, scholars at home and abroad pay more and more attention to grid cascading failures. They proposed a variety of power grid cascading failure models, among which the OPA model proposed by Dobson et al. was the most concerned; the OPA model was developed by Oak Ridge National Laboratory (ORNL) The system engineering research center (PSerc) and a number of researchers at the University of Alaska jointly proposed that the model is named after the first English letters of the three research institutions; the core of the OPA model is b...

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Problems solved by technology

[0004] The computational complexity of the OPA model is equivalent to the linear programming problem, which is a significant advantage of this model, so it has a relatively fast calculation speed, especially suitable for large power grids; but it also has two obvious shortcomings: one is the fast dynamic process of the OPA model The DC power flow model is used to calculate the power flow distribution of the system, ignoring the directional characteristics of the power flow, so it will bring some errors when simulating the dynamics of the power grid; the second is the action of the OPA model in simulating the upgrade and evolution of the power grid in the slow dynamic process Does not match the actual project

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