| A clean smart network with high penetration is an inevitable form of the future power system in various countries.There are both uncertain and flexible elements in the distribution system,and the boundaries between planning and operation are becoming increasingly blurred.The distribution network planning methods are in urgent need of new changes.Considering operational flexibility and source-load uncertainty,this paper researches on the method of distribution network expansion planning.First,this paper uses an improved probabilistic multi-scenario method to deal with the uncertainty in the distribution network.Through the probability modeling,scenario generation,and clustering reduction of source-load uncertainty factors,the transition from an uncertain scenario to a deterministic scenario is achieved,which provides a foundation for flexible quantitative assessment and expansion planning of the distribution network.Secondly,this paper defines the operational flexibility and a quantification method,and presents a flexibility assessment model for distribution networks that adapts to source-load uncertainty.Through the modeling of the flexibility and uncertainty elements in the system,the optimization method was used to quantify the operational flexibility,and a sensitivity analysis was performed on the flexibility resources.Finally,this paper proposes a distribution network expansion planning method that considers operational flexibility resources.By constructing a mathematical model of the planning layer and the operating layer,the operation control method is used to delay the expansion requirements and improve the economics of the planning method. |
