Nuclear power station main transformer service life management strategy optimization method based on genetic algorithm

Abstract

The invention relates to a nuclear power station main transformer service life management strategy optimization method based on a genetic algorithm. The method comprises the following steps of (1) dividing failure events of a main transformer into a plurality of classes; (2) selecting double-parameter Weibull distribution to serve as a failure disjunction distribution model, obtaining double parameters through a maximum likelihood estimation method, and according to service life distribution of describing parts of a nonhomogeneous poisson process used by the double parameters, obtaining a failure efficiency function of the parts; (3) according to classification and the failure efficiency function of the parts, obtaining annual failure frequency of a failure accident in each type; (4) according to the annual failure frequency of the failure accident in each type and a service life management strategy, calculating preventability maintenance cost, corrective maintenance cost and capacity loss cost; and (5) using the genetic algorithm to conduct optimal calculating on a service life management strategy meeting the condition, and obtaining a service life management strategy with optimal cost. The method can find out the most suitable service life management strategy for the main transformer and other parts, and enables the main transformer to achieve cost minimization in the service life.

Description

technical field [0001] The invention relates to a method for formulating a life management strategy for a main transformer of a nuclear power plant, in particular to an optimization method for a life management strategy for a main transformer based on a genetic algorithm. Background technique [0002] During the lifetime of a nuclear power plant, different maintenance strategies (maintenance methods and maintenance intervals) have different impacts on equipment economics. The life cycle management strategy is to determine the best maintenance method and maintenance cycle of the equipment during the life of the power plant by evaluating the economics of the equipment under different maintenance strategies. The main transformer is one of the major key equipment of the conventional island of the nuclear power plant. [0003] The maintenance methods of the main transformer include preventive maintenance, component replacement, complete phase replacement, renovation, etc. In or...

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Problems solved by technology

In fact, the maintenance types and maintenance cycles of transformers can be combined arbitrarily, and the number is much larger than the pre-specified ones. Therefore, the above method may not be able to find the optimal maintenance strategy

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