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Multi-index fuzzy evaluation method for grid faults caused by disasters

A technology for power grid fault and fuzzy determination, which is applied in the fields of electrical digital data processing, instrumentation, and calculation, and can solve the problems of automatic reclosing without considering the voltage level of transmission lines and the length of transmission lines.

Inactive Publication Date: 2014-03-26
STATE GRID CORP OF CHINA +2
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  • Summary
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Problems solved by technology

In the process of analyzing the power grid faults caused by disasters, the analysis index only relies on the number of disasters to evaluate and explain, without considering the voltage level of transmission lines, the length of transmission lines, and automatic reclosing, etc., which has great defects

Method used

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  • Multi-index fuzzy evaluation method for grid faults caused by disasters
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  • Multi-index fuzzy evaluation method for grid faults caused by disasters

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Embodiment

[0072] One, at first, introduce the method principle that the present invention relates to:

[0073] The present invention is based on the definition of four kinds of judgment indicators for the ability of disasters to affect the power grid: the number of trips, the number of unplanned outages, the comprehensive trip rate of regional transmission lines, and the reclosing failure rate, wherein,

[0074] 1. Use N for the number of trips T (j) indicates that it specifically refers to the number of grid trips triggered by disaster j each year, and its unit is next year;

[0075] 2. Use N for the number of unplanned outages NPO (j) indicates that it specifically refers to the number of grid trips triggered by disaster j each year, and its unit is next year;

[0076] 3. R ​​is used for the comprehensive trip rate of regional transmission lines CT (j) means, based on the following formula:

[0077] R CT ( j ...

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Abstract

The invention belongs to the technical field of electrical power system risk evaluation, and particularly relates to a multi-index fuzzy evaluation method for grid faults caused by disasters. The evaluation method comprises the following steps of providing four indexes for evaluating a grid affected by the disasters according to an operational aspect of an electric transmission line; fuzzifying the indexes by utilizing a fuzzy mathematic theory; respectively carrying out weight analysis on the evaluated indexes through an analytic hierarchy process and an entropy evaluation method to obtain a primary weight and a secondary weight of each evaluated index; and synthesizing the weights obtained by the two methods, and combining a method of weighted mean obtain a comprehensive evaluation result of the grid faults caused by the disasters, and form a fuzzy synthetic evaluation method. The evaluation method takes multiple influence factors of natural disasters on the grid into account, can be used for carrying out comprehensive comparison and analysis on influence of various natural disasters on the grid, and has stronger comprehensive and objectivity.

Description

technical field [0001] The invention belongs to the technical field of power system risk judgment, and in particular relates to a multi-index fuzzy judgment method for a power grid fault caused by a disaster. Background technique [0002] In recent years, global extreme climate change has led to a significant increase in disaster events. The frequent occurrence of disaster events has increased the difficulty of controlling the safe and stable operation of the power grid, and has also put forward higher requirements for the reliable power supply of the power grid. my country's natural disasters are characterized by diversity, frequency and regionality. In order to strengthen the power grid's ability to cope with disasters and establish a disaster early warning mechanism, targeted research and deployment should be carried out according to the impact of disasters on the power grid. [0003] At present, the research on the impact of natural disasters on the power system mainly f...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 赵洁黄涌刘涤尘赵红生周雨田唐飞王骏杨楠
Owner STATE GRID CORP OF CHINA
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