| Traditionally, single-line diagrams and planar graphs are used in the management of urban power grid. As the economic develops rapidly, there is a significant increase in load capacity and density, the urban power grid becomes more and more complex. The current information of urban power grid and municipal environment can barely be shown by the traditional ways. In recent years the development of 3D modeling, space database, and MAS(multi-agent system) technique make it possible to display the needed information in 3D space really, exactly and completely, which urban power grid desired. Thus, research on 3D visualization of urban power network planning platform and dynamic programming method has important theoretical and practical significance.This paper has made a deep discussion on creating 3D visualization urban power network planning platform and some problems applying MAS technique to urban power network planning. It contains the following sections:In chapter 1, the current information of urban power grid development has been analyzed at first. Then, deep discussions about the research contents, objective and significance have been made. Also, there gives an overview of problems which existed in current urban power grid planning, it is pointed out that 3D visualization is a new approach to solve these problems.In chapter 2, after the introduction of basic concepts and crucial techniques about 3D visualization, there has an analysis on the principal functions of 3D visualization urban power network planning platform, which include the analysis of current power grid, substation capacity and location, load forecasting and network planning etc. Then, according requirements of these principal functions, researches and designs on overall framework, network framework, overall flow of data and power grid model have been made. Furthermore, it gives some discussions about graphics software platform. At last, list out all crucial techniques of platform framework.In chapter 3, IEC-61970/61968 has been studied. Combining with the 3D modeling, some models of urban power grid are created, which can provide a basic support for virtual reality. And study about the space database, multi-data access technique can also give a feasible technical scheme for the management, transmission and communication of urban power grid information.In chapter 4, it is focused on the urban power grid planning data integration platform based on 3D visualization technique. Commence to "Information Island" problem, CORBA and enterprise synthetic integration bus and other new standard etc. are adopted. Based on the MAS, an open information integration platform with multi-business application, multi-software system and multi-manipulation platform is proposed. This ca provides the information acquisition, sharing and transmission of 3D urban power grid.In chapter 5, based on MAS technology, it has proposed a framework to solve a range of problems in urban power gird optimal planning. At first, distributed computing architecture which combine particle swarm optimization algorithm is proposed. Then, according to problems of load forecasting, substation capacity and location, network planning etc, it has improved the algorithms. The platform created is expected to give support to carry out large-scale urban grid dynamically visualization planning by combining space data to improve the optimization model.In order to validate the effectiveness of the 3D visualization urban power network planning platform, this paper take "The 12th five-year Chongqing Urban power gird planning as an example, Chapter 6 gives part of planning results.In chapter 7, it summarizes the main contribution of this paper and gives some prospect for the future research.
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