Research On Distribution Network Reconfiguration Considering Correlation Of Distributed Generation

Distribution network reconfiguration is an effective method for network losses reduction,load balancing,overload eliminating and assurance of voltage quality,which has drawn wide and lasting attentions and researches.Therefore,this paper studied distribution network reconfiguration in multiple aspects.The characteristic of closed-loop design and open-loop operation of distribution network reconfiguration asks for topology analysis of distribution networks to satisfy the requirement of non-loop and non-island.This paper proposed basic ring info matrix based scheme to eliminate the invalid solutions of distribution networks.The info matrix recorded all the situations of distribution network containing loops,a set of certain conditions were implemented to ensure the inexistent of island when distribution network contains no loop.By adopting some simplification treatments before topology analysis,the efficiency of aforementioned methodology can be greatly improved.An improved genetic algorithm,which integrated the pre-selection mechanism of niche genetic algorithm(2+2)and migration operation of coarse-grained genetic algorithm and implemented the conception of agent and domain of multi-agent genetic algorithm,was proposed.The proposed algorithm considered subpopulations as agent,and restrict the migration operation to the domains.Result of numerous simulations has proved that the performance of the proposed algorithm excelled the original one.Currently,the widely spread distributed generations in distribution networks has changed the original operation mode of distribution networks deeply,and the uncertainties of wind farm and PV power plant has made the modeling of distribution networks become difficult.This paper stressed on researches the relativity problem of multiple distribution generations in the same distribution networks.The Copula theory was used in modeling the joint model of output power between two adjacent wind farms,which provided a more accurate distribution networks model for distribution network reconfiguration contains distributed generations.The Cholesky decomposition method was used to transform the correlated input variables into individual ones,which enables the application of cumulant power flow methods.