Multi-Time Scale Intra-Day Optimal Scheduling Of Integrated Energy Systems Considering Carbon Trading

With the continuous increase of energy demand,the problems of global warming,environmental pollution and energy exhaustion are becoming more and more serious.At present,the biggest problem facing the energy industry is how to establish a clean,lowcarbon,safe and efficient energy system to reduce environmental pollution in the process of energy production,transportation,conversion and consumption.The integrated energy supply system can have a synergistic effect of multiple energies,which plays a very important role in promoting the absorption of new energy and reducing carbon dioxide emissions.In this paper,the basic concept and research background of the integrated energy system are briefly described,respectively from four aspects of the integrated energy system operation and planning research status,comprehensive demand response carbon trading mechanism and multi-time scale scheduling strategy research status.Based on the basic structure of the integrated energy system,the steady-state mathematical models such as the cold,heat and electricity cogeneration system,gas boiler,refrigeration equipment and multisource energy storage equipment are established.The carbon trading mechanism is expounded and a stepped carbon trading model is established.In order to improve the economy and environmental protection of the system,a dayahead optimal scheduling strategy of the integrated energy system is constructed,which takes into account stepped carbon trading and comprehensive demand response.Firstly,in order to fully consider the low carbon of the integrated energy system,the stepped carbon trading cost calculation model is used in the integrated energy system.Secondly,based on the flexible characteristics and dispatching value of electricity,heat,cold and gas loads,a complete demand-type comprehensive demand response model is established.Finally,the day-ahead optimization model takes the minimum sum of energy purchase,operation and maintenance costs and carbon trading costs as the objective function.The example simulation sets different scenarios for comparison,and verifies the effectiveness of the stepped carbon trading mechanism and comprehensive demand response strategy in improving economics and environmental protection,and reduces the peak-valley difference of load,which can realize the low-carbon and economic operation of the comprehensive energy system.Aiming at the problem that the settlement cycle of the stepped carbon trading with a day-ahead long time scale is fixed and a piecewise function,and the applicability of intraday multi-cycle carbon trading is low,an optimal scheduling model for intra-day carbon trading is constructed.Firstly,the intra-day carbon trading system takes 4 hours as a settlement cycle,that is,carbon trading costs are settled every 4 hours in intra-day rolling optimization,and 15 minutes is taken as a time unit.Each dispatch is informed of the data of the previous hour in advance and revises the day-ahead dispatch plan through rolling optimization.Secondly,the multi-energy coupling mathematical model of comprehensive energy was established with the lowest penalty cost of energy purchase,operation and maintenance,intra-day carbon trading and intra-day load adjustment as the objective function in intra-day optimal scheduling.Finally,the intra-day carbon trading model can effectively reduce the influence of source load prediction error on system operation and improve the accuracy of the integrated energy system through multiple scenarios simulation.