In order to improve the energy and economic benefits of the integrated energy system (IES)
a two-stage optimal configuration method of the IES is proposed
which considers energy grade difference and the interaction between supply and demand. The first level combines the first and second laws of thermodynamics to optimize the rated capacity of renewable energy units
energy conversion and energy storage equipment with the objective of maximizing the system cost saving rate and exergy efficiency. At the second level
the demand response strategy is introduced to implement the cooperative optimization of source
storage and load
which aims to minimize the cost and energy consumption and determine the operation scheme of the system
and the differential evolution algorithm and nonlinear programming method are organically combined to solve the two-stage model. The simulation results show that the proposed method can improve the energy and economic performance of the IES while optimizing the system capacity.
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