1.College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China;2.NARI Group Corporation (State Grid Electric Power Research Institute), Nanjing 211106, China

Flexible load scheduling is an important means to optimize load curve, reduce equipment capacity, and promote renewable energy accommodation. Taking transmission delay of heating network and ambiguity about temperature perception into account, a thermal flexible load model is established. Considering three types of electric flexible load including shiftable, transferable and curtailable loads, with the minimum total cost including investment, operation and compensation cost as the objective function, an optimal configuration model of power/thermal energy storage for regional integrated energy system (RIES) is established. Moreover, a simulation program using a commercial software called LINGO is developed to obtain the optimal output of each device and optimal capacity of energy storage. Compared with the scenario where the power/thermal flexible load is not considered， simulation results indicate that the participation of the power/thermal flexible load can optimize the power/thermal load curve, reduce the capacity of the energy storage device, enhance the flexible adjustment capability of RIES, reduce the energy consumption and investment cost of energy storage, and achieve the optimal economic operation of the system.