Dual-Objective Optimization of Integrated Energy System Dispatch with Energy Efficiency

To improve the integrated energy efficiency of Integrated Energy Systems (IES), a multi-objective optimization model is proposed. First, the energy efficiency of the IES is analyzed across five stages: energy supply, conversion, transmission, storage, and demand. Then, a multi-objective optimization model for the electric-gas-heat-storage IES is established, with the objective functions of minimizing system economic costs and maximizing integrated energy efficiency. Furthermore, to address the non-convex objective function, a linearization transformation is applied, and the ε-constraint method is used to obtain the Pareto front. Finally, the case study is conducted to verify the effectiveness of the proposed model and approach.