Method for determining power transmission line reinforcing scheme by comprehensive fault rate and economic efficiency evaluation

Abstract

The invention discloses a method for determining a power transmission line reinforcing scheme by comprehensive fault rate and economic efficiency evaluation. The method includes adopting the general extreme value theory to model historical ice coating data of an area to obtain probability of ice disasters of the area with specific ice coating thickness; establishing a circuit fault rate function based on physical stress analysis of power transmission lines according to the metal deformation theory, and establishing a fuzzy fault rate model of the lines by virtue of fuzzy offline rate; comprehensively considering the probability of the ice disasters in the area with the specific ice coating thickness and the fuzzy fault rate of the lines in the area to obtain comprehensive fault rate of the lines; calculating differential 'detraction' benefits by means of the comprehensive fault rate, establishing an economic efficiency evaluation index system of differential planning on this basis, and determining the sectional reinforcing scheme of the lines. The method for determining the power transmission line reinforcing scheme by the comprehensive fault rate plays an important role in guiding workout of the line-difference sectional reinforcing scheme in the differential planning and has great significance in improving anti-disaster ability of the power grid.

Description

technical field [0001] The invention belongs to the field of differentiated planning of electric power systems, and more specifically relates to a method for determining a section strengthening scheme of a transmission line based on a comprehensive failure rate and an economic evaluation index. Background technique [0002] Changes in global meteorological conditions have led to frequent occurrence of extreme weather events, among which ice and snow disasters have caused the most damage to the power grid. In 1998, Quebec, Canada was hit by a blizzard. In 2008, most parts of southern China were hit by rare rain, snow and ice. In 2014, the power grid in northwestern Hubei encountered a rare freezing disaster, which caused the interruption of the transmission channel of some power plants. These frequent natural disasters seriously threaten the safe and stable operation of the power grid. How to reduce the destructive consequences of meteorological disasters to the power grid h...

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Problems solved by technology

[0006] Song Chunli et al. published in Power Grid Technology 2013,37(7):1849-1855 "Economic Evaluation Method for Power Grid Planning Based on Differentiated Life Cycle Costs", which proposed an economic evaluation system and evaluation indicators suitable for differentiated power grid planning. However, the line failure rate involved in these indicators uses the annual average failure rate corresponding to the n-year encounter, which is relatively simple, and the results of the economic indicators obtained from this are not accurate.

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