Cooperative Optimal Scheduling Of Integrated Energy System Considering Multiple Demand Response

Integrated energy system is an important physical carrier of energy Internet.In recent years,the installed amount of clean energy and new energy accounts for an increasing proportion in the energy supply end,resulting in high wind and light abandonment rate and more and more significant problems of power supply reliability.Coordinated scheduling of energy supply side,energy storage system and user side,considering the coupling scheduling of various energy sources,can effectively improve the utilization rate of wind and improve the reliability of power supply of the comprehensive energy system.Firstly,this thesis introduces the research status at home and abroad from two aspects of energy storage capacity optimization allocation and economic scheduling in integrated energy system.At present,the coupling configuration and scheduling technology of multiple energy forms of electrothermal hydrogen are not mature enough,and the cooperative scheduling strategy of multiple energy storage system,new energy output terminal and load terminal needs to be studied.In view of the above problems,this thesis establishes a two-layer optimal allocation model of energy storage capacity of electro-thermal hydrogen integrated energy system containing multiple energy sources,multiple energy forms and multiple energy storage systems,studies the effects of demand response resources on the system’s abandonment rate and system economy,and combines demand response resources with multi-time scale scheduling strategies.A multi-time scale economic scheduling model of integrated energy system with multiple energy storage considering demand response is established.Secondly,in view of the insufficient research on cooperative scheduling of multiple energy storage system,new energy output terminal and load terminal,a mathematical model of park comprehensive energy system with multiple energy storage was established,and the demand response load was divided into two kinds of load forms: reducible load and transferable load.Mathematical models of new energy power generation system,energy conversion unit,multiple energy storage system and demand response resources are established,so as to break the traditional single energy system structure,strengthen the coupling performance between different energy sources,and optimize the actual operation of the system.Then,based on the comprehensive energy system in a park in north of our country,aiming at the demands of electricity,heat,hydrogen and other energy forms,and combining the presented mathematical model of the comprehensive energy system and the load characteristics,the double-layer optimization configuration model of the comprehensive energy system in a park is established.The upper layer considers the optimal allocation of energy storage capacity,the lower layer considers the optimization of operation,the upper layer transfers the constant capacity scheme to the lower layer,and the lower layer feedbacks the optimization results to the upper layer.The two are interdependent and influence each other.The feasibility and effectiveness of the proposed model are verified by simulation examples.Finally,a multi-time scale economic scheduling model of a comprehensive energy system with multiple energy storage is established considering demand response,and scheduling analysis is carried out on two time scales from day-day to day-day.Shifting load only participates in day-ahead scheduling,while reducing load participates in day-ahead and day-ahead scheduling by introducing demand response coefficient.This thesis takes the comprehensive energy system in a park in north of our country as an example,uses the capacity configuration result of multiple energy storage system,and uses the Pareto evolutionary strength algorithm 2 to solve the problem.The numerical results show that the participation of demand response resources in multi-time scale energy scheduling can make up for the shortage of energy storage reserve capacity and reduce the operation and maintenance cost of equipment.In the day-before and day-day scheduling stage,the demand response can further excavate the dispatching capacity of the system and improve economic benefits,reduce the situation of wind abandonment and load loss,and realize the full utilization of new energy output terminal and load terminal resources.