Research On Failure Restoration Strategy Of Integrated Energy Distribution Network Considering Electiric-gas Coupling

With the increasing scarcity of primary energy and the global environmental problem,renewable energy has become a main form of power generation that is currently being used and researched by society.However,the traditional energy system is mainly based on a single electricity network.Natural gas networks,heat energy networks and electrical energy networks are rarely connected.There is no overall planning and research on the impact of integrated energy systems on society.As the latest form of energy supply,integrated energy systems include electric,heat and gas supply,realizes the coupling of various energy sources in each link,with the advantages of flexible and efficient,gradient energy supply and collaborative utilization,etc.,which has been highly valued by the society.With the gradual development of the integrated energy system,when the distribution network fails,it will have a greater impact on human life,and the electric power will not be able to recover for a long time.Therefore,restoring electric power to the distribution network using other energy sources has become a backup option.Under the above background,this article has discussed and studied the related content,and mainly completed the following aspects of research work:Firstly,modeling and analysis of the electric-gas-coupled integrated energy system,introducing the topology analysis method and the distribution network power flow calculation method based on breadth-first search,laid a theoretical foundation for the development of a comprehensive energy system recovery plan.Secondly,in order to increase the restoration range and restoration time of the distribution network,a bi-level optimization theory is used to establish a fault restoration of electricity and gas with integrated energy and economy and environmental protection.The improved ant colony algorithm and multilevel.The restoration model optimizes the upper and lower models,and then uses the contribution of the gray target to objectively assign the upper indicators.The restoration plan is comprehensively evaluated through the bulls-eyes degree.Simulation examples show that it is superior to use electricity-gas coupling integrated energy to restore the distribution network,and verify the effectiveness and practicability of expanding the recovery range.Finally,for the restoration of the integrated energy system,an integrated electric-heatgas demand response mechanism based on multi-energy complementarity is proposed.Among them,electric energy uses the revenue function of the VCG-Kelly mechanism to obtain demand response users;heat energy uses user satisfaction and heat energy elasticity to determine the switching sequence of the heating and heating unit and the order of the backup energy;the gas energy uses alternative demand response to perform energy conversion after failure.Considering the integrated demand response characteristics of electricity,heat and gas as a whole,energy loss recovery and continuous power supply in non-fault areas are realized through energy conversion,and a bi-level optimization model is used to coordinate the recovery range and user satisfaction to obtain the optimal fault recovery plan for each period.The example is verified to be effective an practical for increasing the system load recovery rate and improving the recovery economy.