Research On Optimal Strategy For Hybrid Operation Of Electricity And Natural Gas System Considering Renewable Energy Consumption

Due to the characteristics of strong randomness,volatility,and intermittency of renewable energy sources such as solar and wind energy,the consumption problem of renewable energy power generation has become particularly prominent.With the rapid development of power-to-gas(P2G)technology,the coordinated operation of integrated electricity and natural gas system with P2 G equipment and gas turbines as coupling elements has become a reality.Different scales of equipments and hybrid energy system operation strategies have a significant impact on renewable energy consumption capacity and operating economy.Therefore,it is of great significance to carry out research on the hybrid optimization strategy of the integrated electricity and natural gas system to improve the consumption rate of renewable power generation and the economics of hybrid energy system.This article first describes the current research status of the integrated electricity and natural gas system,the consumption of renewable energy generation,P2 G technology and carbon capture system(CCS).On this basis,the overall architecture and energy flow characteristics of the integrated electricity and natural gas system are discussed,and the output models of related components are given,which provides a theoretical basis for subsequent experimental analysis.Secondly,the economic evaluation model of hybrid energy system based on variable capacity of P2 G equipment is proposed,and the optimal return on investment of P2 G plant is taken as the target.The case study gives the installed capacity of P2 G plant under the optimal return on investment,and analyzes the impact of P2 G technology on the proportion of renewable energy consumption,the supply of natural gas and the reduction of carbon tax in the integrated electricity and natural gas system.The economics and operating conditions of P2 G plants under three typical installed capacities are also compared and analyzed.Subsequently,in order to improve the dispatch ability,the role of peak-shaving and valley-filling of the renewable energy power generation,and to enhance the operating economy of hybrid energy system,the battery storage system(BSS)has been introduced.The operation optimization strategy of the hybrid energy system aims to achieve the minimum operating cost of the system and the improved PSO algorithm is used to find the optimal solution.The case study compares the operating economy of the hybrid energy system with or without BSS and analyzes the impact of natural gas price fluctuations on operating state and economy of the system.Finally,based on the limited effect of P2 G technology on carbon emission and carbon tax reduction,it is proposed to introduce CCS to enhance the low-carbon economy of the operation in integrated electricity and natural gas system,aiming at the minimum operating cost and the cost of carbon emission reduction of the system.The case study compares the economic characteristics of low-carbon operation of the system in the presence or absence of CCS.At the same time,the results of the low-carbon economy operation under the two mechanisms of carbon tax and carbon trading are analyzed,and the impact of the two carbon emission reduction measures on the system's low-carbon economy operation are also compared.The simulation result shows that P2 G technology can effectively reduce the abandonment rate of renewable power generation,gas supply and carbon tax cost of the integrated electricity and natural gas system,the reasonable planning of the installed capacity for P2 G plant is of great significance to the economic benefits;The introduction of BSS greatly improves the economic operation of hybrid energy systems.The price fluctuations of natural gas have a small impact on the economic efficiency of the hybrid energy system but a greater impact on the operating conditions of the hybrid energy system;CCS can effectively improve the low-carbon economic operating characteristics of the system under the current circumstances,the carbon trading mechanism has a better economic and low-carbon benefit driving force than the carbon tax policy.