Steady State Analysis of Cold-Heat-Power-Gas-Steam Optimization in Integrated Energy System Considering Energy Storage Devices

Regarding the fact that the key characteristic variables of the coordinated operation of the cooling, heat, power, (natural) gas, and steam subsystems (CHPGSS) are not fully considered in the integrated energy system (IES), the day-ahead dynamic economic dispatch (DED) for IES considering these variables of CHPGSS is studied. In order to analyze the interactive influence of CHPGSS, a hybrid CHPGS energy flows model and calculation method are developed in this paper, coupling parts of CHPGSS are concerned with the core concept of energy hub (HB). Firstly, considering the well-known principle of "temperature matched and cascade utilization" based on the concept of thermal energy level, coupled modes of different energy qualities and energy levels are designed in HB. Secondly, based on HB, the model architecture of the energy station with CHPGSS is designed and the steady state operation model of CHPGSS is proposed, respectively. Then, based on time-of-use (TOU) power price power price mechanism, the influence of power storage, heat storage and cold storage on day-ahead DED of IES is analyzed. Finally, a 0-1 mixed integer nonlinear programming (MINLP) for day-ahead DED is established under different load structures with CHPGSS. The numerical results verify the validity of DED calculation and steady state operation analysis for IES. The models and methods are suitable for day-ahead DED analysis of IES containing CHPGSS, which can reasonably reflect the operation characteristics of the IES.