Distribution transformer optimal selection method with fault risk and whole life cycle cost influence being taken into consideration

Abstract

Provided is a distribution transformer optimal selection method with fault risk and whole life cycle cost influence being taken into consideration. The method quantifies the fault risks of the distribution transformer under different overloads, makes cost compositions in a whole life cycle model clear, obtains whole life cycle cost considering fault risk by adding fault risk to the model, and carries out assessment decision on capacity selection risk due to distribution transformer overload by combining a decision-making tree method so as to determine an optimal distribution transformer selection scheme. The distribution transformer optimal selection method realizes integration of energy saving performance and economical performance of capacity selection of the distribution transformer by comprehensively comparing each cost in the whole life cycle of the distribution transformer; and meanwhile, the fault risk of the distribution transformer under the overload condition is taken into consideration, so that the corrected whole life cycle model is allowed to meet the practical situation better, and the method provides more reliable data support for the optimal selection of the distribution transformer.

Description

technical field [0001] The invention relates to the technical field of power system energy-saving planning, in particular to a method for optimizing a distribution transformer considering the impact of failure risk and full life cycle cost. Background technique [0002] The transformer is the main equipment for the operation of the power system. During the process of transforming voltage and transmitting power, it will generate active power loss and reactive power loss. Although the efficiency of distribution transformers has reached 95% to 99%, due to the huge number of use and long-term continuous operation, the cumulative loss value is considerable. According to statistics, the loss of transformers in the national power grid accounts for more than 3% of the total power generation. Therefore, it is necessary to study the economical operation mode of the transformer, and achieve the purpose of saving electric energy by choosing the type and capacity of the transformer reas...

AI Technical Summary

Problems solved by technology

[0004] In the actual operation process, the change of distribution transformer load is difficult to predict

When the maximum load is greater than the maximum overload capacity of the distribution transformer, the failure probability of the distribution transformer is dozens of times higher than usual, and the resulting loss of power supply interruption and maintenance costs are considerable, which directly affects the power supply stability of the power system.

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