Optimal Scheduling with Electricity-Gas-Heat Subsystem for Integrated Energy Systems

The integrated energy system can realize the coordination and complementarity of various energy sources and improve the energy utilization rate. Firstly, an integrated energy system model including electricity, gas, heat and various coupling devices is established. According to the flexible characteristics and schedulable value of electricity, gas and heat loads, combined with the coupling relationship of the three networks and loads in the integrated energy system, an optimal scheduling model of the integrated energy system with electricity, gas and heat loads is proposed. The optimization objective of the model is to minimize the comprehensive operation cost. The nonlinear terms in the model are linearized, and then the optimization toolbox is used to solve the problem and output the optimal results. Finally, the improved IEEE39 bus power system, 20 bus natural gas system and 6 bus thermal system are tested as the electricity-gas-heat integrated energy system. The experimental results verify the correctness and effectiveness of the proposed model and method.