Research On Multi-time Scale Low-carbon Economic Dispatch Of Integrated Energy System

With the continuous development of the economy and the continuous pursuit of a better life by mankind,it has become a new trend of current energy development to improve environmental benefits while ensuring energy supply.The "14th Five-Year Plan" proposes to build a green low-carbon recycling economy,and to do a good job of "carbon peaking and carbon neutrality" is listed as one of the key tasks,providing policy support for the realization of a low-carbon economy.The integrated energy system integrates electricity,heat,and gas,and can effectively reduce carbon emissions through multi-energy complementation.However,in the integrated energy system,there are many types of energy conversion equipment for electricity,heat,and gas,the complicated and changeable energy supply methods,and the uncertainty of renewable energy supply,all of which pose challenges to the low-carbon economy of the integrated energy system.In order to realize the low-carbon economic optimization management of the integrated energy system,this paper analyzes the integrated energy system under multiple time scales from the aspects of unit modeling,carbon emission modeling,day-ahead low-carbon scheduling,intra-day rolling,and real-time low-carbon scheduling.The energy power model and low-carbon scheduling optimization methods are studied in depth.The main research work of this paper is as follows:(1)Based on the basic structure of the low-carbon integrated energy system,analyze the power characteristics of each unit of the integrated energy system composed of thermal power units,gas turbines,electric boilers,batteries,gas storage,heat storage,etc.,and study the energy conversion and Store the process and establish the power model of each unit of the integrated energy system.On this basis,the relationship between the carbon emissions of thermal power units and gas turbines and the output of the units is studied,and the carbon emission model of the energy supply unit in the integrated energy system is established.(2)In order to solve the problem of carbon emission reduction under the day-ahead scheduling plan of the integrated energy system,based on the carbon emission model of the integrated energy system,considering emission reduction targets and system operation safety factors,a carbon emission index model and a carbon emission limit model are established.By analyzing the economic model and carbon emission model of the integrated energy system,establish a day-ahead low-carbon scheduling model of the integrated energy system,and rationally plan the output of each unit that can achieve the carbon emission reduction target under the premise of satisfying the balance of supply and demand.Through simulation analysis,the economics and carbon emissions of the integrated energy system under different scenarios are compared and verified,which provides a basis for subsequent multi-time scale scheduling.(3)Aiming at the issue of the weakening of carbon emission reduction effect due to the fluctuation of new energy output under the day-ahead scheduling strategy,this paper establishes an intraday rolling and real-time low-carbon optimization model under the integrated energy system emission reduction target.Based on the day-ahead scheduling plan obtained during the day-a-day low-carbon scheduling stage,firstly the day-ahead plan is revised through 4h rolling scheduling within the day;then the output of the unit within 15 minutes is fine-tuned with the goal of minimum adjustment,for the subsequent low-carbon emission reduction The goal is to provide a daily output plan.On this basis,the carbon emissions under the output plan can be obtained through the carbon emission real-time feedback model;finally the proposed low-carbon scheduling model under multiple time scales is verified through simulation.On the premise of meeting the carbon emission reduction target,decision-making and optimization of scheduling plans under different schemes are made with the goal of economy and carbon emission reduction effects.