(Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China)

The renewable energy power and load power in a microgrid both have uncertainty characteristics, the effects of which are worth careful consideration in the optimal economic dispatching of the microgrid. In order to characterize these uncertainties in the microgrid, the randomness of the wind speed and light intensity is described by the interval, and combined with the interval description of load uncertainty, a microgrid economical optimization model based on interval linear programming (ILP) is proposed. Then by referring to the time-of-use pricing, the issue of power exchange with an external grid is considered. The CPLEX optimization software combined with the C++ programming is applied to the above issue. Finally, with the influence analysis of energy storage on the economical operation of the system as an example, the impact of uncertainty of renewable energy power and load power on the optimization result is discussed. The results have verified the robustness of the proposed method and model, and shown their effectiveness in dealing with uncertainty optimization.