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It will have a great impact on the regional power grid with a large number of electric vehicles charging. In this paper, it analyzes the load distribution of electric vehicles in a certain area of Hunan, from the types of electric vehicles, charging time and charging methods and other factors. The electric vehicle load in this area is also predicted. Firstly, according to the daily load measurement of 60 electric bus charging stations in Changsha east bus station, it fits the curve and obtains its probability function. Secondly, according to the policy and daily life habits, it uses the Monte Carlo random algorithm to estimate the load distribution curve. Finally, it compares the daily load curves of the base load and the total load, which is added the vehicle load, in 2020 and 2030. It analyzes the influence of electric vehicle load under different permeability on the daily load of summer and winter power grid in the area and puts forward the corresponding control measures.

This paper focus on the behavior of autogenous shrinkage of high strength/performance concrete with water cement ratio of 0.3 and slump flow of 500mm based on the experiment under 4 different curing temperatures (10°C; 20°C;, 28°C;, 35°C;). The influence of curing temperature on autogenous shrinkage strain and strain rate was discussed; the usability of evaluation on the influence of curing temperature based on the concept of equivalent age was investigated. The results showed that the amount and rate of autogenous shrinkage strain both increase with the rising of curing temperature; the equivalent age has a better applicability to evaluating the influence of curing temperature on autogenous shrinkage of HSC/HPC which is cured in higher temperature than in lower temperature.