Utilizing regional integrated energy system(RIES)to improve load side flexibility is an important technical means to increase the penetration level of renewable energy in the power system. The thermal and electrical energy storage system(ESS)in the RIES can be decoupled between the thermal and electric power to effectively reduce operation cost. The scenario-based analysis method is used to model the randomness of renewable energy output and review the impact of the renewable energy volatility on the operational optimization of RIES with combined cooling

heating and power(CCHP). Based on the characteristics of the equipment in RIES

a model for RIES including energy conversion equipment and ESS is established. Moreover

a simulation program in MATLAB using YALMIP toolbox and a software called CPLEX has been developed to obtain the optimal output of each unit in the system and the total operation cost in different dispatching modes. The result of the simulation program shows that a RIES with CCHP and ESS can effectively decouple its thermoelectric operation constraints with the help of energy storage equipment

bringing into full play the economic advantage received from the RIES operation backed by the Energy Internet.