Electric power system fragile line identification method for coping with hurricane disasters

Abstract

The invention discloses an electric power system fragile line identification method for coping with hurricane disasters. The method comprises the folllwing steps: firstly, quantifying the influence of hurricane wind speed and line power flow out-of-limit on the line fault probability; secondly, describing the fault of the power system under extreme disasters such as hurricane as a continuous disturbance process considering the continuous influence of strong wind; then simulating faults of the system under the disaster by adopting a Monte Carlo simulation method to obtain a large number of cascading fault accident chains; and further constructing a fault association graph CFGPD under continuous disturbance which describes a line fault sequence and a loss condition, and finally providing a fragile line identification mode based on the CFGPD. According to the method, the influence degree of disasters on the power system is calculated from the two dimensions of time and space, corresponding reinforcement measures are taken for the identified fragile lines, the load loss amount of the system is greatly reduced, and support is provided for disaster prevention.

Description

technical field [0001] The invention relates to the technical field of power system operation and pre-disaster early warning, in particular to a method for identifying vulnerable lines in a power system for dealing with hurricane disasters. Background technique [0002] Hurricane weather is an extreme natural disaster, which can easily lead to large-scale faults in the power system area where it passes through. The specific manifestations are disconnection of transmission lines, flashover of insulators, collapse of iron towers, and self-excited vibration of lines. At present, there are many model studies on the derivation of wind field and wind speed based on the historical meteorological data of hurricanes, but their versatility is not high and the calculation is cumbersome. [0003] In order to study the power system's ability to respond to hurricane disaster events, hurricane disaster events are divided into three stages: before the occurrence of hurricane disaster weathe...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and proposes a method for identifying vulnerable lines in a power system to deal with hurricane disasters, which can effectively solve the problem that the existing system response strategy is only executed after a failure occurs, so the current power grid catastrophe The reinforcement method is not forward-looking enough, and there is a lack of technical problems in the identification of vulnerable lines in the power grid under catastrophe, which can simultaneously consider the disaster failure probability and the pre-disaster early warning enhancement strategy

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