Resilience Evaluation And Expansion Planning Of Power Gas Interconnected Energy System Under Extreme Disasters

In recent years,with the development of gas-fired power generation technology and electricity-to-gas technology,the degree of coupling between the power system and the natural gas system has continued to increase,making the electric-gas interconnected energy system integrating the two systems a research hot spot.At the same time,frequent extreme disasters have caused huge damage to the infrastructure of energy systems such as electricity and natural gas,and resilient systems with sufficient resilience have attracted more and more attention.At present,there have been a lot of researches on the resilience of electric power system,and the resilience related issues of the electricity-gas interconnected energy system still need to be explored in depth.Therefore,this article takes the electricity-gas interconnected energy system under extreme disasters as the research object,focusing on resilience evaluation and consideration of resilience improvement research on the expansion plan of the company.The main contents are as follows:First,the basic structure of the analogy power system gives the basic structure of the natural gas system,and then briefly describes the basic structure of the electricity-gas interconnected energy system,and gives the mathematical models of the coupling elements and energy storage elements used in this article.It focuses on the concept of resilience,resilience evaluation methods and resilience improvement measures,which lays the theoretical foundation for the following research.Secondly,for the resilience assessment of the electricity-gas interconnected energy system under different extreme disasters,the failure rate model of the electricity-gas interconnected energy system under typhoon and earthquake disasters was established and the failure scenarios were generated,using robustness indicators and rapidity Indicators and comprehensive indicators evaluate the resilience of the electricity-gas interconnected energy system.The simulation example verifies that the proposed resilience evaluation index of the electricity-gas interconnected energy system can comprehensively analyze and evaluate the elastic performance of the electricity-gas interconnected energy system under extreme disasters.It also verifies that the coupling of the power system and the natural gas system is beneficial to resist extremes.disaster.Finally,in order to describe the damage of power lines and gas pipelines after extreme disasters,the entropy weight decision method is used to classify their disaster resistance and establish a set of fault uncertainties.With the goal of minimizing the sum of investment cost and load loss cost,using energy storage batteries,gas generators,gas storage tanks,electric-to-gas devices and other equipment,a method for expansion planning of the electricity-gas interconnected energy system considering resilience improvement is proposed.Rod optimization model.The column and constraint algorithm is used to solve the proposed model,and a simulation example is used to verify that the proposed extended planning model can improve the resilience of the electricity-gas interconnected energy system.