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In recent years China presents to send power from west to east, and positively develop ultra high voltage and DC transmissions. This paper introduces the DC modeling in highvoltage direct current transmission the general method; respectively analyzed the characteristics of three kinds of simulation model and scope of application. Deduce the mathematical model formula of the main part of DC system, describe the basic control principle. By SIMULINK software to use the detailed model of HVDC system simulation model is established. And in view of the common faults under transient conditions are simulated. Through the simulation results show that in the transient analysis to choose the model is suitable and reliable.

On the basis of recent years relevant literature, combined with the relevant research results of electric vehicle charging station development status at home and abroad. The methods of the quantitative research are briefly analyzed for charging station construction of electric vehicle. The construction method of common model analysis and comparison of the charging station construction summed up the theory of city electric vehicle charging facilities layout planning, in order to provide a useful reference for future research. At the same time, it also introduces the user demand before charging station construction and the user satisfaction after charging station construction.

Under the dual pressures of environmental protection and energy, the development of electric vehicles has been accelerated again. Under this background, analyzes the necessity and trend of development of electric vehicles, electric vehicles on national development incentive and management policies, and evaluate the large-scale development impact on the distribution network of electric vehicles. In order to reduce the influence on distribution network, the current charging mode, switching mode and related charging strategy are described.