The study of integrated energy system (IES) with multiple energy sources is an effective way to realize energy transition and low-carbon electricity. To further explore the potential of IES in low-carbon and economic operation

we propose an optimal operation strategy of IES considering the concentrated solar power (CSP) plant and liquefied air energy storage (LAES). The IES architecture consisting of LAES

CSP power plant and each energy conversion equipment is constructed by combining the cold and heat cycle characteristics of LAES

and the mathematical model of each equipment is established. A stepped carbon trading mechanism is introduced

and an IES optimized operation model is established with the objective of minimizing the comprehensive cost of energy purchase

operation and maintenance

and carbon emission cost of the system. On this basis

an IES fuzzy opportunity constrained planning model considering multiple uncertainties is established. The results show that the proposed strategy can effectively reduce the total cost and carbon emission of the system

and the increase of uncertainty will mainly increase the energy purchase cost of the system.