Optimization Model For Highly Efficient And Cooperative Operation Of User-level Integrated Energy System

Energy is an important material basis for human survival and social development and progress.However,with the development of global social economy in recent years,the contradiction between the rapid growth of enegy demand and environmental issues such as greenhouse gas emissions has become increasingly prominent.At present,countries have formed a consensus to actively promote the comprehensive energy utilization technology,and have focused on the energy development of the integrated energy system that can achieve multi-energy collaboration and efficient coordinated operation.China is the largest energy consumption country in the world,and coal consumption has long occupied the leading position in the energy consumption structure,so the contradiction between the growth of energy demand and environmental problems is more prominent.With the promotion of the 13th five year plan,the state has put forward more requirements for improving energy utilization efficiency and promoting energy comprehensive utilization.However,in the comprehensive energy system,many kinds of energy are closely coupled,energy supply and load are closely coupled,and there are two-way uncertainties.At this stage,the problem of how to understand and quantify to further optimize the integration and interaction of multi-energy flows is still not well solved.At present,it is of great significance for China’s integrated energy system to grasp the mechanism of realizing energy cascade utilization to improve comprehensive energy utilization efficiency.In this paper,based on the analysis of the related research on the optimal operation of the integrated energy system,an optimization model for highly efficient and cooperative operation of user-level integrated energy system considering the cascade utilization of energy is established.The model focuses on the fine differentiation and matching utilization of the thermal energy grade in the system,so as to realize the multi-energy collaboration and efficient operation of the system..Firstly,from the multi-energy demand of users,the multi-energy flow cascade utilization structure of the user-level integrated energy system is established which distinguish the heat energy grade;secondly,the energy production equipment and conversion equipment in the integrated energy system are modeled,focusing on the refined energy cascade utilization model of the natural gas distributed system;on this basis,the optimization model for highly efficient and cooperative operation aimed at high comprehensive energy utilization efficiency is established,which considers the constraints of production equipment operation,system balance and so on.Finally,taking industrial parks in different scenarios as an example,the optimization model established is applied for example analysis.It can be calculated that the optimization model considering the cascade utilization of energy can not only improve the comprehensive energy utilization efficiency,but also obtain better economic benefits,which provides an optimization scheme for the efficient and economic operation of China’s integrated energy system.