Study On Self-healing Control Method Of Smart Distribution Network

Smart grid is a pronoun of the advanced future power grid. Smart gridhas six characteristics: strong, self-healing, compatible, economy,integration, optimize, and self-healing is the most important of them.Realizing self-healing includes two parts: self-adjust in normal state andself-recovery in breakdown state. This thesis studies on the second part.The aim of self-healing control is supply ongoing electric power throughdistribution network.This thesis summarizes smart grid and introduces development historyand the frame of smart grid. Clarify the profound significance of studyingon smart grid and an important position that smart distribution networktaken. Introduce current research situation of distribution networkself-healing control. Summarize the mathematical programming method,heuristic method and artificial intelligence method of distribution networkself-healing application respectively, and analyze the advantages anddisadvantages of those methods.Making a topology analysis and calculate load flow of electric distribution network will gain real-time information reflect the condition ofsystem, and also is the foundation to achieve fault recovery of electricdistribution network. Topology analysis methods of distribution networkare introduced by This thesis, and according to radial structurecharacteristics of distribution network operation a topology analysismethod based on multi-branch tree is proposed in the thesis, which canrecognize the variation of network structure dynamically according to thechange of pointer variable address. So as to the flow calculation, comparedwith another electric distribution network flow calculation methods,combined with treelike topological structure of electric distributionnetwork, adopt the back/forward sweep base on branch power to calculateload flow, and prove the method is valid.A fast heuristic search recovery strategy which aims to recover lostload maximization is proposed by this thesis. Build a electric distributionnetwork fault recovery mathematical model and set heuristic search rules.Divide fault recovery process into5steps: self-feeder recovery, whole arearecovery, partition recovery, transfer load by next level feeder and cut load.Set up relevant constraint condition and consider the priority level of thelost load. Realize the identification of distribution network topology andcalculation of load flow by C programming on vc6.0platform. Prove thevalidity and reliability of the method proposed with two typical testsystems on Digsilent platform.