Economic dispatch of CAES in an integrated energy system with cooling, heating, and electricity supplies

Abstract

Flexible combined cooling, heating, and power (CCHP) systems are effective in integrating wind sources. As an attractive, clean, and large-scale energy storage technique, the advanced adiabatic compressed air energy storage (AA-CAES) can store and generate both electricity and heating, and also provide cooling during expansion under certain conditions. Although AA-CAES has immense potential in multi-energy supply systems, CCHP dispatch with AA-CAES and wind power generation (WPG) is yet to be systematically studied. In this study, the economic dispatch of an AA-CAES system equipped with WPG is addressed. The AA-CAES system is comprehensively modelled by considering its thermal characteristics, air-temperature changes due to heating exchange, air storage constraint, and other factors, particularly the heat supply to the air for expansion, which is a key factor that influences the cooling supply. Subsequently, the cooling, heating, and power of the AA-CAES system are dispatched to minimise the operating cost under different supply modes. In conclusion, the proposed method is demonstrated using an integrated energy system in an industrial park, and the operation cost of the AA-CAES system is minimised. The numerical results demonstrate that the participation of AA-CAES in CCHP dispatch can curtail WPG and reduce operation costs. The economics of the different supply modes of AA-CAES are also discussed.