In order to keep the efficient operation of the active distribution power grid while the electrical vehicles pluging in

we propose an active reconfiguration strategy considering spatial-temporal electrical vehicle load model.According to the network function

the distribution network is classified into residential distribution network

industrial distribution network

and commercial distribution network.Firstly

based on the probability transfer characteristic of electrical vehicle in three distribution networks

the electrical load is built in terms of time and space by the statistical method

and the 24 hours load trend in a whole day in three distribution networks is obtained.Secondly

a power supply capability index（PSCI） is proposed

which is able to evaluate the security level of distribution network.The PSCI and line loss are set as the multilayer optimization objectives.The improved Krill Herd algorithm is proposed to solve the optimization problem to obtain the active reconfiguration strategy that ensures the safe and economical operation of the distribution grid in a whole day.Finally

the case study is carried out with a typical IEEE 33 bus distribution network and actual data.The simulation results show that the proposed active reconfiguration strategy is effective

which provides a guideline for practical operation of distribution network.