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High uncertainty and large fluctuation of variable renewable energy create enormous challenges to planning and operation of integrated energy systems. To overcome these problems, this paper proposed an improved min-max dispatching method. In the meantime, a control algorithm for short-term power dispatching was proposed and implemented to smoothen the power dispatching between two neighboring dispatching intervals. The improved min-max dispatching method was applied to a 1 kW experimental PV system with real-time data. The optimal capacity of the battery energy storage system obtained by the improved min-max method is 40% smaller than the volume obtained by the modified min-max method. Regarding the operation of the BESS, the average depth of discharge is 0.5988, which is 7.06% higher than the operation performance with the alternative dispatching method. The results clearly indicate that improved min-max dispatching method is a very effective approach for managing grid-connected integrated energy systems and promoting penetration of variable renewable energies.