Multi-objective Distribution Network Rapid Reconfiguration With Wind Power Generators Considering Reliability

Distribution network reconfiguration is to improve the operation status of distribution network.As the size of distribution network increases,the complexity of solving the reconfiguration problem increases and the speed of solving is getting slower.In order to achieve frequent reconfiguration to improve network performance,the problem of optimizing search space for distribution network needs to be solved urgently.It is a hot research topic how to coordinate various technical and economic indicators and improve the reliability of distribution network as much as possible under the premise of realizing economic operation of distribution network.In view of the above problems,the following studyies are carried out in this paper:Firstly,a multi-objective distribution network reconfiguration algorithm based on gardening graph is proposed.By introducing the gardening diagram to analyze the network structure,the switch combination is eliminated,the search space is reduced and the efficiency of the algorithm is improved.At the same time,the adaptive parameters are introduced into the traditional harmony search algorithm.By learning the information obtained in the search process,the parameters are adaptively adjusted to avoid falling into local optimum and improve convergence.The concept of Pareto optimal is used to solve the multi-objective optimization problem of distribution network reconfiguration.Finally,a set composed of a group of non-dominant solutions is obtained.Secondly,considering the network invulnerability,a model for multi-objective distribution network reconfiguration with wind power generators and its solving algorithm are proposed.Network invulnerability represents the ability of distribution network to resist damage,maintain network connectivity and maintain power supply.This index analyses the reliability of network from the whole network level.In addition,on the basis of the existing simple weightless network,combined with the actual situation of distribution network,the complex network theory is introduced to analyze the invulnerability of the weighted network.Considering the impact of distributed generation access such as wind power on network invulnerability index,the network topology reliability is evaluated comprehensively.Finally,on the basis of the above research and Zhejiang University South China Institute of Technology Smart Grid Center Distribution Network Dynamic Simulation Laboratory as a research project,the practical engineering application of the research results of distribution network risk-alert,distribution network fault diagnosis and recovery,invulnerability detection are introduced.The hardware architecture,data architecture,development software configuration,software architecture logic and the actual function effect of the system are explained in detail.The research results will provide theoretical guidance and key technical support for the realization of distribution network reconfiguration,risk-alert,fault diagnosis and recovery,and also a good supplement to the actual optimal operation of distribution network.