Optimization method and device for distribution network short-term maintenance plan

Abstract

The invention relates to a short-time overhaul plan optimization method and apparatus for a power distribution network. According to an upper layer optimization model, upper layer optimization constraint conditions, the size of a harmony memory library, a to-be-detected equipment number and a predicted fluctuation curve, a feasible solution with the same size as the harmony memory library and a first fitness value corresponding to the feasible solution are obtained; according to harmony algorithm rules and harmony algorithm parameters, a new solution is obtained; according to the new solution,lower layer optimization constraint conditions and the to-be-detected equipment number, lower layer optimization is performed, and a lower layer optimization scheme is output; according to the upperlayer optimization model, the lower layer optimization scheme, the new solution, the to-be-detected equipment number and the predicted fluctuation curve, a second fitness value is obtained; accordingto the second fitness value and the first fitness value corresponding to a worst solution of the harmony memory library, the harmony memory library is updated; an updating frequency is iterated to obtain an iterative frequency; and when the iterative frequency reaches a maximum iterative frequency, the updated harmony memory library is output. The power supply reliability of the power distributionnetwork is improved.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method and device for optimizing short-term maintenance plans of distribution networks. Background technique [0002] As an important link in the operation and management of distribution network, distribution network maintenance can effectively reduce the failure rate of equipment and reduce the risk of distribution network operation, and plays an important role in ensuring the safety of distribution network operation and improving the reliability of power supply. [0003] At present, domestic and foreign research on distribution network equipment maintenance is mainly divided into long-term maintenance plans based on risk theory and short-term maintenance plans based on equipment status assessment, but the traditional long-term maintenance plan based on risk theory is mainly based on the analysis of equipment failures. However, there is still a large gap between the prediction of ...

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Problems solved by technology

[0003] At present, domestic and foreign research on distribution network equipment maintenance is mainly divided into long-term maintenance plans based on risk theory and short-term maintenance plans based on equipment status assessment, but the traditional long-term maintenance plan based on risk theory is mainly based on the analysis of equipment failures. However, there is still a large gap between the prediction of the failure rate of distribution network equipment and the actual working conditions. In addition, when the equipment is overhauled, the load transfer through the opening and closing of the contact switch and the section switch is not considered, which will affect the maintenance of the equipment. There is a certain deviation in the calculation of the economical efficiency of the scheme. The short-term maintenance plan refers to completing the maintenance or eliminating the defects within the specified time for the equipment in poor condition or with obvious defects after evaluating the state of the key equipment of the distribution network. It will be more efficient and reasonable, and it is of great significance to further improve the reliability of power supply by finding an optimization method for the short-term maintenance plan of the distribution network

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