Research On Flow Allocation And Optimization Of Natural Gas Pipeline Network In China

In the natural gas industry chain,the pipe network transportation system as an intermediate link connects the upstream mining and downstream consumer markets as a whole.The specific allocation of natural gas in the pipe network is closely related to the economic interests of the participating parties,making the pipe network system Natural gas flow allocation and the social welfare level of the natural gas industry play a decisive role.Therefore,mastering the optimization method of natural gas pipeline network flow allocation,understanding the important factors and mechanisms affecting the operation of natural gas pipeline network,has important theoretical and practical significance for the development of natural gas industry and market-oriented reform.This paper firstly constructs a natural gas optimal allocation model for regional urban gas distribution network system,and then builds a long-distance natural gas pipeline network flow optimization configuration model,and uses it for empirical analysis of China's natural gas market,and finally simulates different factors for natural gas.The impact of pipe network traffic allocation has put forward policy recommendations for China's natural gas pipeline network system and market development.Specific work and innovation contributions are reflected in the following aspects:(1)The flow distribution optimization model of regional gas distribution network is constructed.The physical network element and market economic elements are integrated into the model.The social welfare is maximized as the objective function,and the iterative linear pressure flow constraint is constructed to optimize the highly nonlinear pipe network.The problem is transformed into a multi-stage quadratic programming problem,which reduces the complexity of modeling.The optimization model with linear approximation has been used.Although the accuracy can be improved by approximating the point,it will greatly increase the time-consuming solution.Through case study,it is verified that the model can be saved without losing the efficiency of the solution.Improve optimization accuracy in an iterative manner.(2)Based on the regional gas distribution network model,the energy consumption variable generated by the long-distance pipeline compressor station was added,and the flow distribution optimization model of long-distance gas pipeline network was constructed.The empirical analysis was carried out for China long-distance pipeline network system and natural gas market.The study considers the current price control mechanism,as well as the characteristics of China's natural gas market such as monopoly of pipe network,simulates the allocation of natural gas resources in China,compares the simulation results with actual data,and verifies the model's operation on the actual natural gas market.Simulation effect.Finally,according to the key variables in the modeling process,the policy factors,the pipe network structure factors and the external supply uncertainty factors that affect the allocation efficiency of China's natural gas market are summarized.(3)Simulation analysis of China's natural gas resource allocation under policy changes,changes in pipe network structure,and external supply fluctuation scenarios.First,elimination of price control and the separation of the management rights of the pipe network could achieve a more free market competition environment,the results show that free pricing and the open network make the allocation of natural gas resources more flexible and can improve the overall social welfare of the natural gas industry.Then,changing the pipe network structure by adding new pipelines to improve the efficiency of the pipe network to natural gas transmission,and considering the cost of the new pipeline,the cost-effectiveness of all new pipelines is calculated to provide a reference for pipe network layout planning.Finally,simulating supply reduction of pipeline natural gas import and and the increase of marine LNG prices.The results show that the reduction of natural gas pipeline imports from Central Asia will quickly affect the natural gas consumption market across the country.In the supply shortage crisis,the impact of LNG price increase on national consumption is limited,indicating that China's current natural gas consumption is relatively rigid,and the simulation results of supply uncertainty have certain policy implications for China's natural gas supply security and energy strategic layout.