Small world power grid cascading failure restraining method

A cascading failure and power grid technology, applied in the electrical field, can solve the problems of repeated fault infection, expansion of fault propagation range, and accumulation of fault propagation intensity.

Active Publication Date: 2013-06-12
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The results show that there is redundancy in the connection structure in the high-clustering area. When the fault propagates in this area, the redundancy in the network structure will promote the repeated infection of the fault in the local area, resulting in the accumulati

Method used

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  • Small world power grid cascading failure restraining method
  • Small world power grid cascading failure restraining method
  • Small world power grid cascading failure restraining method

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Experimental program
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Embodiment

[0054] 1. First, the cascading failure model of the power network is introduced.

[0055] The general form of the node equation of the power network is:

[0056] I=YV (1)

[0057] In the formula: I is the node injection current column vector, V is the node voltage column vector, and Y is the node admittance matrix. In the process of cascading faults, when the line or node exceeds the rated capacity and is cut off, the network structure of the system will change, that is, the change of Y will cause the change of each power flow distribution V and I. In order to facilitate the characteristic parameters of the network model to characterize the load transfer of the actual system. The invention uses as branch e ij The weight at time t is defined as the grid branch e ij The active power of each steady-state power flow P ij The inverse ratio of is:

[0058] W ij e ( t ) ...

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Abstract

The invention relates to a small world power grid cascading failure restraining method. The method comprises the steps that according to a network state before failure and specific information of a primary failure, a corresponding cascading failure restraining method is formulated, a connecting structure of a failure potential infection area is changed through the facts that a small amount of nodes with low transmission loads are cut off and short-distance accesses between a high cluster failure transmission subnet and power-load node pairs are reduced, and therefore failures are prevented from accumulating.

Description

technical field [0001] The invention belongs to the electrical field, and relates to a fault suppression method, in particular to a small-world grid cascading fault suppression method. Background technique [0002] The current frequent blackouts have attracted people's attention, and many researchers have analyzed the vulnerability of power networks based on complex network theory. The research results show that most power networks at home and abroad have small-world characteristics. This type of network structure is relatively compact and has high transmission efficiency, but it also has inherent structural vulnerability. When a cascading fault is triggered, the fault will spread in a large area through the long-distance connection in the network in the form of overload. Faults propagate faster and affect a larger area. Therefore, it is an urgent problem to study the suppression strategy of cascading failures for the structural vulnerability of small-world power grids. ...

Claims

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Application Information

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IPC IPC(8): H02J3/00
Inventor 邓长虹舒征宇
Owner WUHAN UNIV
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