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Power grid cascading failure determination method based on improved OPA model

A technology of cascading faults and determination methods, applied in the direction of fault location, etc., can solve problems such as errors and inconsistencies

Inactive Publication Date: 2015-07-22
NORTHEASTERN UNIV LIAONING
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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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  • Power grid cascading failure determination method based on improved OPA model
  • Power grid cascading failure determination method based on improved OPA model
  • Power grid cascading failure determination method based on improved OPA model

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Embodiment Construction

[0061] An embodiment of the present invention will be further described below in conjunction with the accompanying drawings.

[0062] In the embodiment of the present invention, the power grid cascading failure determination method based on the improved OPA model, the method flow chart is as follows figure 1 shown, including the following steps:

[0063] Step 1. Improve the fast dynamic process of the OPA model. The flow chart of the method is as follows figure 2 As shown, the specific steps are as follows:

[0064] Step 1-1, constructing the topological diagram of the target power grid, determining the parameters of the generator nodes, load nodes and lines in the topological diagram of the power grid, the parameters including the impedance and admittance of the lines;

[0065] like image 3 As shown, in the embodiment of the present invention, the calculation and analysis of the IEEE39 node system can intuitively reflect the occurrence and propagation of cascading faults...

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Abstract

The invention provides a power grid cascading failure determination method based on an improved OPA model and belongs to the field of electric work. The optimal power flow model is applied to an OPA model fast dynamic process to calculate power flow distribution of systems, and loss of communication of the power grid caused by system load shedding is reduced to the utmost extent on the basis of the generated betweenness index. As a power grid topology evolution model is obtained according to an evolution mechanism of the power grid, problems about time to build, address, capacity, power grid accessing and the like of new transformer substations and power plants are researched, and the power grid topology evolution laws are reflected effectively. Besides, the conception of difference planning is applied to upgrade of the power grid and reconstruction of power lines, and the key lines are subjected to expansion to guarantee continuous power supply for important loads. Compared with the original OPA model, the improved model is much formal, comprehensive and practical when used in simulation of power grid cascading failure and power grid upgrade evolution.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 杨珺张化光王占山张帅孙秋野刘鑫蕊王智良黄博南杨东升冯健马大中会国涛
Owner NORTHEASTERN UNIV LIAONING
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