Abstract: A mixed integer programming model,which can be used in microgrid intra-day scheduling,is put forward in order to conciliate further the desired attributes of accuracy and computational performance in existing intra-day scheduling model.The model of storage battery charge/discharge process,which considers charge/discharge cycles and aging cost,is proposed.Compared with the conventional model for microgrid economical dispatching,the linearized constraint model,such as power flow with voltage amplitude limitation,branch capacity based on Cartesian geometry,transferring power and power factor of point of common couple et al,is established.The numerical results of case studies demonstrate that the proposed model and its solution are of the fast convergence and independent of initial points,and the storage battery model is in line with the practical engineering,overcoming the limitations of the existing model,which accelerates deterioration due to switching frequently between charge and discharge of storage battery.