Research On Equipment Selection And Capacity Planning Of Integrated Energy System Considering Equipment Characteristics

Under the background of energy revolution,China’s energy system is developing towards the mode of coordinated supply of cold,heat,electricity and gas.Integrated energy system is one of the important means to realize the energy revolution in China,because it has the characteristics of multi energy collaborative supply,which can realize the coordinated supply of cold,heat,electricity and gas in a certain region,reduce the cost and carbon emissions at the same time.In the integrated energy system,there are many kinds of equipment,complex forms of energy coupling and various energy structures;there are differences in cost and efficiency among different brands of equipment models,resulting in the complex selection of integrated energy system equipment.Adhering to the idea that the best planning is the best optimization,this paper studies the energy structure scenario selection,equipment model optimization and installed capacity optimization problems in the planning of integrated energy system.Firstly,the coupling and complementary characteristics of the integrated energy system are studied.The economic coupling characteristics,space-time coupling and complementary characteristics,stability coupling and complementary characteristics of the integrated energy system are proposed,and the output model of the equipment in the integrated energy system is constructed;Secondly,the case-based reasoning method is studied,and an energy structure optimization model of integrated energy system based on nearest neighbor method is constructed;Then,based on the energy coupling mechanism,the integrated energy system planning simulation strategy is constructed;Combined with the idea of double-layer optimization,a comprehensive energy system selection and capacity optimization model of "outer layer selection and inner layer constant capacity" is constructed.In the model,the optimization objective function with the lowest total cost in the whole life cycle is proposed.In the outer layer selection model,the constraint conditions including equipment matching and mutual exclusion are constructed.In the inner layer constant capacity model,the optimization objective function with the lowest total cost in the whole life cycle is proposed In addition,the algorithm for solving the internal and external model is proposed.Finally,a park is selected for simulation analysis.Based on the case database data,the energy planning structure with high matching degree is calculated.Through the planning simulation strategy and planning optimization model,the model selection and capacity planning of the integrated energy system park are carried out,and the economic parameters such as equipment model,installed capacity,equipment quantity and investment cost are obtained.The results show that the model constructed in this paper can save cost for the planning and construction scheme of integrated energy system and improve energy efficiency in the operation stage.