Low-carbon economy configuration strategy of electro-thermal hybrid shared energy storage in multiple multi-energy microgrids considering power to gas and carbon capture system

Hybrid shared energy storage based on electro-thermal coupling is an economical and effective way to solve the mismatch between the demand and supply of multiple multi-energy microgrids (MEMGs). However, its impact on the environment is often ignored. How to take into account economic development and environmental protection by optimizing its capacity configuration has become a key challenge. From the perspective of economy and environment, this paper explores the comprehensive benefits and capacity configuration of electrothermal hybrid shared energy storage (ET-HSES) while considering the carbon trading mechanism and the coupling system of power to gas (P2G) and carbon capture system (CCS). Firstly, an energy sharing framework between the ET-HSES and the MEMGs is built. Secondly, a bi-level optimization model is constructed for the optimal scheduling problem of different stakeholders. Thirdly, Karush-Kuhn-Tucker (KKT) optimality conditions and Big-M method are used to transform the bi-level model into a single-level model. The results show that ETHSES can effectively save the capacity of energy storage equipment, significantly reduce the operating costs and carbon emissions of MEMGs, and improve the income of ET-HSES operator (ET-HSESO). The combination of carbon trading mechanism and coupling system of P2G and CCS can effectively reduce the operating costs and carbon emissions of MEMGs. Meanwhile, it will also reduce the benefits of ET-HSESO.