Research On Modeling Method And Implement Of Distribution Network Topology Based On GIS

Distribution Network GIS, with its capability to describ and manage graphic information,as well as with the advantage to manage integratively spatial and other data, has been widely applicated for the information management of distribution network. As the distribution network has been mor and more complex, the demand for research on distribution network topology modeling based on Distribution Network GIS is increasing.First, the Geodatabase model was introduced. Following the discussion on distribution network's struction and characteristic of data in it, one spatial data model based on Geodatabase for distribution network was researched and built. And, the solution was researched and given to manage deta as well as the distribution network GIS by management of data's versions together with user's roles based on ArcSDE.The method to describe network topology by Geodatabase was introduced. After analyzing the characteristic of distribution network topology, the modeling method was researched to form the geomeric network and logical network.Then, a series of modeling technique to actualize the functions including searching for the power supply, inspecting circuit-loop, marking a facility and auto-mapping distribution drawing were discussed.Based on method to describ and analyze distribution network topology, the technique to actualize the analyzing functions of distribution network operation was researched as as follows.For the statistical reliability of distribution system, a solution was discussed and achieved. The way in this solution to ensure statistical data dependable is that the status of power outage will be analyzed and memorize automatically once any switch is operated. Accoding to this solution, the result of reliability would be more accurate than to the existing others. And more, the difficulty to adjust-self to any change of distributtion network structure would not exist accoding to this solution.For analysis of line loss, considering the complication and flexiblity of distribution network, as well as the difficults in the current MIS to make sure of necessary facilitis and these indexes, one computational model for line loss was researched. In that, the Distribution Network GIS's abilities to caculate network's topology and to manage integratively spatial and other data was full played. According to the model, the necessary facilitis for analysis of line loss including transformer and segment of wire would be hunt easily out based Distribution Network GIS. The paths of load flow would be found fast based Distribution Network GIS, and the length of each segment of wire along the path would be picked-up. By this solution, any kind of theoretic line loss due to each load node can be calculated one by one. And any change of distributtion network's structure can be adjusted-self. The analysis of line loss will be more accurate and more feasible profit from this solution.For the short-term load forecasting, the grey theory was used. The taxonomy historic load data was discussed and designed. The solution of Short-term load based on residual GM(1,1)model forecasting was reseached and tested in the Distribution Network GIS. Profit from this solution, the short-term load forecasting sould be more accurate.For the optimal scheme of the power cut, a conception called as "coefficient of reliability guarantee" was puted forward. The method was designed to obtain quantificationally this coefficient with device's load remainder and the runing time divided by lift-time. The method was established else to evaluate reliability of whole distribution system. With the genetic algorithm, the improved genetic operators was adopted to program optimal scheme of the power cut.At last,the technique of distribution network reconfiguration based on Distribution Network GIS was researched. And the technique based on Tabu Search was test for network reconfiguration.