Research And Development For GIS-Based Power Flow Of Distribution System

Geography Information System (GIS) can combine the information of figure reflecting geography position. It can realize the database system which has the function of topology and analysis. The study of GIS and its data-structure which is congruous with the situation of power system, especially distribution system, is very valuable and practical for improving the reliability of power system and efficiency of power network management.The topology algorithms aimed at the transmission system can not be applied to distribution system directly and characteristics of distribution system should be taken into account to modify the existent topology algorithms. Furthermore, one hotspot problem of distribution topology analysis is the formation of original topology. This thesis combined with the main method of spatial data model Geodatabase, brings forward constructed flexible and efficiently distribution topology data model .According to the characteristics of the Geodatabase data model, the paper redefines the rule of topo formation and combines DFS and BFS form a new topology analysis algorithm and realizes the real-time topology analysis for distribution network.The power flow calculation is very important to analyze the distribution network, but some traditional power flow methods, such as the method of fast decoupled load flow, Newton-Raphson, whose convergence are feebleness, even is divergence, and cannot be used to deal with distribution network effectively. Based on special hierarchy characteristic of radial network, this paper proposed a layer-by-layer back/forward sweep distribution load flow algorithm in the environment of Distribution GIS. In this algorithm, the nodes of network are sorted by layers and the loss of voltage and power of speed of power flow can be increased greatly.