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Multi-fault Repair Recovery Strategy For Active Distribution Network With Distributed Power

Posted on:2021-03-28Degree:MasterType:Thesis
Country:ChinaCandidate:R C GuanFull Text:PDF
GTID:2392330632456758Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
With the development of science and technology,the forms of power access in the current distribution network show a trend of diversification.In recent years,the flexible development of load control technology makes the network structure of active distribution network more and more complex.Especially in the face of the problem of multi fault repair and recovery,the traditional scheduling strategy of distribution network ignores the existence of these new power supply and active technology,making the recovery strategy It is more and more obvious that the power loss load can not be recovered completely.Therefore,how to make full use of the load control technology and DG operation characteristics to coordinate with the distribution network to recover is of practical significance.In this regard,this paper has done the following research work:First of all,the basic knowledge of graph theory is introduced,and the basic principles of depth first search method and breadth first search method for searching network are expounded.In view of the nonlinear characteristics of distribution network fault repair and recovery,an improved binary coding particle swarm optimization(BPSO)algorithm is proposed,which lays the foundation for the subsequent solution of the optimization model.Secondly,aiming at the islanding problem of active distribution network DG and main network feeder cooperative restoration,considering the economy of system operation and the recovery of power loss load,a multi-stage and multi fault repair and restoration collaborative optimization model of distribution network with DG is established.In the phase of emergency repair and recovery,the feeder equivalent method is introduced to simplify the solution model,and the BPSO algorithm is used to solve the model with the maximum recovery of important load as the upper goal and the shortest repair time as the lower goal;in the phase of collaborative optimization of distributed resource scheduling and emergency repair recovery,the priority recovery is achieved by establishing controllable load alliance and dynamic scheduling of emergency electric vehicles For the purpose of important load,the BPSO algorithm is used to solve the model with the objective of minimum comprehensive cost as the upper objective and the objective of minimum comprehensive economic loss as the lower objective,and finally the optimal repair sequence and load recovery scheme are obtained.Finally,according to the requirement of fast recovery after fault isolation in distribution network,considering the uncertainty of DG output and active load scheduling,a MAS based and multi fault scenario dynamic recovery model is constructed;by improving the island division method,the collaborative optimization of DG,main network and mobile generation resources is further realized;at the same time,the power balance index and transfer capacity margin are defined According to the degree index and transfer capacity margin index,the strategy of fault repair and recovery in different scenes and periods is determined;considering the sudden new fault in the process of recovery,the power loss load is recovered dynamically by MAS through the technical means of island division and regional interconnection transfer load,so as to complete the recovery as soon as possible.
Keywords/Search Tags:fault repair, fault recovery, binary coding particle swarm optimization, multi-agent system
PDF Full Text Request
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