Optimal Dispatch And Reliability Evaluation Of Integrated Energy System With Multi-micro Energy Grid

In recent years,with the reform of the mechanism and system in the energy sector,especially the reform of the incremental power distribution network and the liberalization of the electricity distribution and sales market,local investment enterprises have quickly entered the relevant fields of energy Internet construction by building a comprehensive energy system for the park,providing comprehensive energy services,Also formed a multi-micro energy grid integrated energy system structure.As a small-scale energy management,transmission and deployment distributed integrated energy system composed of distributed energy,energy storage devices,energy conversion devices,loads,monitoring and protection devices,the micro-energy grid is flexible and can be used through Multiple energy conversion and load aggregation rationally utilize the user’s energy demand characteristics and local resource conditions to realize the cascade utilization of energy.It is the physical carrier on the load side of the Energy Internet,and it is also a high-quality dispatching resource.However,the upper-level integrated energy system and each micro-energy network belong to different stakeholders.When there is energy interaction between the multi-micro energy network and the upper-level integrated energy system,the complex interaction of benefits will bring huge impact to the optimization and control of the entire system.Challenges also increase the reliability risk of system operation.Based on the above background,this article takes the integrated energy system with multi-micro energy grid as the research object,and launches research on the coordinated and optimized dispatch of multi-micro energy grid and system reliability.The main contents are as follows:(1)The network model of each subsystem,the mathematical model of coupling equipment and the power flow calculation method of the entire system under the environment of the integrated energy system with multi-micro energy grid are studied.First,the basic structure of the integrated energy system with multi-micro energy grid is analyzed,and then the typical components involved in the system,power system power flow model and natural gas system power flow model are modeled,and constructed according to the energy consumption characteristics of the micro energy grid Finally,summarize and analyze the current main IES power flow solving methods.According to the characteristics of the coupled model considered in this paper,the decomposition method is used to solve the energy flow of IES.(2)Aiming at the problem of multi-party interest interaction and regulation operation caused by multiple micro-energy networks connected to the energy Internet,this paper proposes an optimized dispatch strategy for an integrated energy system with multi-micro energy networks.Established an interactive coordination mechanism between micro-energy grids and integrated energy operators,using distributed modeling methods,established economic optimization goals for micro-energy grids and integrated energy operators,and proposed coordination between multi-micro energy grids and integrated energy operators Optimized scheduling strategy.The calculation example shows that the dispatching strategy proposed in this paper ensures the privacy of the micro-energy network information,improves the initiative of the micro-energy network,improves the level of interconnection and mutual benefit between the power and natural gas systems,and reduces the peaks and valleys of the main network’s electricity load.The difference is that each micro-energy network and the main network are mutually beneficial and win-win.With the gradual deepening of the coupling relationship between the power system and the natural gas system,by guiding the micro-energy grid to change the energy use behavior,the ability of the integrated energy system to be interconnected and mutually beneficial will be enhanced,and it will also have an impact on the reliability of the coupled system.This paper focuses on the study of the impact of micro-energy grids on the reliability of the integrated energy system.Based on the controllability of the micro-energy grid and the characteristics of energy consumption changes before and after load replacement,an optimal load shedding model of the integrated energy system with the micro-energy grid is established.System load shedding strategy;based on the non-sequential Monte Carlo method,the reliability evaluation index and algorithm of the integrated energy system with micro-energy grid are proposed;the influence of alternative load penetration and controllability on the reliability of the coupled system is analyzed through calculation examples.The impact of this system provides a reference for the planning and operation of the integrated energy system.