Regional Opportunistic Maintenance Schedule Optimization For Distribution Network Considering Total Supply Capability

The decision making of condition based maintenance for distribution network is a multi-objective complex decision-making problem considering equipment performance,power grid operation,system network structure and maintenance resource allocation.The main focus of the state maintenance decision of distribution network is to consider the equipment individual and the whole system.At present,few literatures start from the relationship between maintenance equipment and equipment and the relationship between equipment and system,and further study the logical relationship between equipment and system in maintenance is made.There is a contradiction between equipment maintenance and failure,but there are various functional connections between equipment and system,that is,the individual needs of equipment and the overall reliability of the system are also contained.How to find the different requirements of the individual and the whole system is a preference decision problem.On the basis of the above problems and summarizing the research results of the existing literature,the main work of this paper is as follows:(1)The equipment maintenance means load transfer or outage,thus optimizing the load transfer path is an essential part of the maintenance plan,a node depth encoding technique(NDE)are prone to violation of constraint optimization problems in operation,this paper improves the NDE based on the original PAO and CAO operations,the transformation of the same area and the transformation of different regions are proposed.At the same time,the radiation constraint and multi-objective optimization of distribution network are taken into account.The improved NDE and the elitist strategy based non dominated sorting genetic algorithm(NDE-NSGA2)are applied to solve the multi-objective optimization problem of distribution network.The algorithm can always guarantee the radial constraint of distribution network in the optimization process.(2)At present,most of the optimization targets of load transfer in the maintenance are economic indexes such as network loss,switching times,loss of load and so on.Based on the reliability index,this paper establishes an active load transfer model with the total supply capability as the main optimization target.To improving the total supply capacity and minimizing network loss are as the objective function,the network switching state is the optimal variable.Finally,taking the IEEE33 node system as an example,the maximum power supply capacity of the distribution network is excavated by actively optimizing the network switching state.(3)The trade-off between the individual performance requirements of the equipment and the system reliability requirements is based on the maintenance decision.This paper first introduces the process of equipment status assessment in distribution network,and gives the concept of opportunity maintenance in this paper.At the same time,considering the selection of device health threshold,system reliability requirements,network topology,maintenance resources,and the number of equipment to be repaired,the regional opportunity maintenance model is established.In order to improve the power supply reliability and power supply margin of the system at the same time of maintenance,a regional opportunity maintenance model considering TSC is established.With RBTS Bus2 system as an example,the validity and rationality of the regional opportunity maintenance model of distribution network considering TSC is verified,and the scheme is analyzed.Finally,the advantages of this model compared with the traditional maintenance decision model are given.