Low-carbon Economic Dispatch Of Integrated Energy System Considering Carbon Capture And Power-to-ga

In recent years,global environmental problems have become increasingly serious,fossil energy has gradually dried up,and the traditional energy industry has a simple structure,which is difficult to meet the needs of low-carbon sustainable development.Integrated Energy System(IES)couple electricity,heat and gas networks,realizes multi-source complementation and cascade utilization among electricity,heat,gas and renewable energy,and its operation mode is flexible,which is an important way and main grasper to realize low-carbon economic operation of energy system.As a new technology combination,IES containing carbon capture,utilization and storage(CCUS)and power-to-gas(P2G)can increase the consumption of clean energy while improving the system operation economy and low carbon,forming a carbon cycle chain and energy cascade utilization mode,which is helpful to realize the coordinated utilization of fossil energy and new energy,and is important to promote energy transformation and energy system reform.In view of this,aiming at the low-carbon economic operation demand of IES,based on the problem of efficient energy utilization,IES containing CCUS and P2 G is studied from two levels of low-carbon technology and market mechanism.The main contents are as follows:(1)The mathematical models of Combined Heat and Power,CHP),Microturbine(MT),electric refrigerator,wind power and photovoltaic units and other equipment are established,and the operation characteristics and working principles of each equipment are expounded in detail,which lays the foundation for the subsequent study of low-carbon economic scheduling of IES.(2)Aiming at the problem of renewable energy consumption,a low-carbon economic dispatching method of IES with two-stage P2 G is proposed.Firstly,a two-stage mathematical model of P2 G is constructed,and the traditional P2 G is replaced by electrolytic cell,methane conversion device and hydrogen fuel cell,and the operation process of P2 G is refined into two stages: hydrogen production by electricity and methanation,which accurately reflects the operation condition of P2 G.Secondly,the carbon trading mechanism is introduced to restrict the carbon emission of the system;Then,taking the optimization of system operation economy and low carbon as the objective function,an IES optimal scheduling model is established.Finally,by setting different operation scenarios,the influence of two-stage P2 G and carbon trading mechanism on the system operation results is analyzed.(3)In order to deeply tap the low-carbon regulation potential of IES and decouple the thermoelectric characteristics of CHP units during operation,a low-carbon economic dispatching method of IES with CCUS-P2G-CHP coupling is proposed.Firstly,the system architecture and operation principle of CCUS are deeply analyzed.Secondly,based on the mathematical model of CHP and two-stage P2 G,the CCUS-P2G-CHP combined operation mode is established,and the operation characteristics of CHP unit under this mode are studied.Then,the ladder-type carbon trading mechanism is introduced to analyze the influence of the sensitivity of each parameter of the stepped carbon trading mechanism on the total operating cost and carbon emissions of the system.Finally,the running results of IES with CCUS-P2 GCHP coupling are analyzed by multi-scenario simulation to verify the effectiveness and superiority of the proposed model.