Economic Operation And Optimal Placement Of Integrated Energy System

The integrated energy system with combined heat and power unit as the core unit breaks the existing mode of separate planning and independent operation of each energy system,improves the economic and environmental benefits of the energy system,and is an important direction of future energy system development.In this paper,the integrated energy system including electricity,gas,heat energy is taken as the research object,and the methods of optimal dispatch and planning of this system are studied.The main work is as follows:1)According to the operation characteristics of electricity-gas system,the models of distribution network and natural gas network are established,and a day-ahead scheduling framework based on Improved Alternating Direction Method of Multipliers(ADMM)algorithm is also proposed.The uncertainty of renewable energy and demand side response including ice storage air conditioning load and decentralized air conditioning load are further taken into consideration,and a two-stage robust optimization model is established where Column and Constraints Generation(C&CG)algorithm is utilized to obtain the worst scenario.Finally,the optimal scheduling scheme is obtained by the proposed model and method,and the interaction between power system and natural gas system is analyzed.2)According to the operation characteristics of the electricity-gas-heat system,a day-ahead scheduling model with the economic cost of the system as the objective function is established,in which the distribution network,the heat network model and the natural gas network model considering the dynamic characteristics are established.In addition,considering the information opacity between the electricity-gas-heat system,the scheduling method based on ADMM-GBS algorithm(ADMM with Gaussian Back Substitution)is proposed.Finally,the effectiveness of the proposed electricity-gas-heat system model and optimization framework is verified by case study.3)According to the optimal planning of electricity-gas-heat system,an optimal planning model considering investment cost and operation cost in different scenarios is proposed.In addition,a distributed optimization framework based on ADMM algorithm is established,in which the optimal planning problem is decomposed into the planning subproblem with investment cost as the objective function and the planning subproblems with operation cost as the objective function in different scenarios.Finally,the effectiveness of the proposed planning model and optimization framework is analyzed by case study.