Research On Flexible And Optimal Operation Of Electric Thermal Integrated Energy System For Wind Power Consumption

Energy is the basis of ensuring the development of human economy and society.With the deepening of industrialization in the world,the social demand for energy is becoming higher and higher.The dual constraints of energy shortage and environmental pollution force countries around the world to speed up the research on the utilization of renewable energy.The integrated energy system has entered the vision of the world because it can realize the efficient use of energy.Integrated energy system refers to the energy system formed by optimizing the generation,transmission,distribution,conversion,storage and consumption of energy in the process of planning,design,construction and operation.It can not only promote the efficient consumption of renewable energy,but also realize the cascade efficient utilization of energy through different energy production,conversion and storage technologies.The integrated energy system relies on the coordination and optimization of multiple energy sources to realize the cascade utilization of energy,which can significantly improve the flexibility and economy of energy supply.In the electric thermal integrated energy system with wind power,due to the lack of flexibility,which leads to the phenomenon of wind power abandoning.Therefore,this paper focuses on improving the flexibility of the electric thermal integrated energy system,so as to improve the level of wind power consumption of the system.The paper mainly studies the flexible optimization operation of the electric thermal integrated energy system for wind power consumption.Firstly,the typical structure of the electric thermal integrated energy system is analyzed,and the models of various flexible equipment in the electric thermal integrated energy system are studied,including the mathematical models of energy production equipment,CHP unit,energy coupling equipment,electric boiler and heat pump,energy storage equipment,heat storage device and other flexible equipment.The model of flexible equipment unit is established,which provides reference for the follow-up systematic research Theoretical basis.The evaluation index of electrothermal integrated energy system is established,which can evaluate the system from three aspects of economy,energy efficiency and flexibility.Secondly,the flexible optimal operation model of integrated energy system for wind power consumption,including electric boiler,heat pump,heat storage and load thermal inertia,is established.The objective function and constraint conditions of the model are as follows: the objective function is composed of three parts,including the coal consumption cost of CHP,the penalty cost of wind power abandonment in abandoned wind section and the interaction cost of external power grid when there is surplus wind power;the constraint conditions include the thermal load balance constraint,the operation constraint of the established equipment model itself,and the thermal load inertia constraint.The SQP algorithm of fmincon function in MATLAB is used to solve the optimal scheduling model.Finally,an example of flexible optimal operation of the integrated energy system is simulated,This paper takes Taihe electric thermal integrated energy system in northern Liaoning Province as an example to verify and analyze the model.Taking the typical daily electric heating load data and wind power output data of winter operation scenario as an example,based on the optimal scheduling model of electric thermal integrated energy system,this paper compares and analyzes the optimal scheduling results of different operation scenarios,and explores the electric boiler,heat pump,heat storage,load thermal inertia and energy consumption Finally,the effectiveness of the dispatching model is verified.