Overhead transmission line optimal economic life range assessment method

Abstract

The invention provides an overhead transmission line optimal economic life range assessment method. The error of a failure rate prediction result of electric transmission and transformation equipment and the subjectivity of rough calculation of partial parameters of the full-life cycle cost cause an economic life result obtained by the adoption of setting calculation to have certain deviation. The overhead transmission line optimal economic life range assessment method comprises the steps that the fuzzy comprehensive evaluation method and the analytic hierarchy process are used for calculating membership degrees of all indexes and weights of all the indexes respectively; then, training output and error calculation are conducted on three failure rates of a transmission line through a least square support vector machine together with the relevant data of the service age, the external operation environment and the quality condition of the transmission line respectively, and a failure rate prediction model of the transmission line is obtained; finally, the interval analysis method is introduced into the life cycle cost theory and the optimal economic life range of the transmission line is obtained at last. According to the overhead transmission line optimal economic life range assessment method, the characteristics that the wild operation environment of the transmission line is poor and the regional span of the transmission line is wide are fully considered, and meanwhile, the problem that for different transmission lines, a uniform life ending standard is hard to provide is solved.

Description

technical field [0001] The invention belongs to the field of power systems, in particular to a method for evaluating the optimal economic life interval of an overhead power transmission line. Background technique [0002] As an important part of the power grid, the transmission line has been in the harsh environment for a long time and the operating conditions are complex and diverse. Therefore, there may be high failure rates and frequent component replacement before reaching the expected design life. The life assessment of transmission lines with a certain service age can effectively avoid a large number of direct economic losses caused by excessive failure rates or frequent maintenance and repairs, and reduce the consequences of high-risk operation of the power grid and indirect economic losses caused by power outages. more immeasurable. In the life cycle asset management of the power grid, the life prediction of the transmission line can realize the life matching betwee...

AI Technical Summary

Problems solved by technology

[0003] In the past, the failure rate prediction model based on Weibull distribution or exponential distribution only used service age as the main variable, and did not consider the influence of other factors on the failure rate, and did not distinguish the severity of failure consequences, making it difficult to finely calculate the failure cost and Maintenance costs

[0004]

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