Low-carbon Economic Dispatch Of Integrated Energy System Considering Demand Response

Global warming,environmental pollution and energy depletion caused by the rise of energy demand are becoming increasingly prominent.How to build a clean,low-carbon,safe and efficient new energy system and reduce the pollution of energy production,transportation,conversion and consumption is one of the main challenges faced by China’s new energy industry.The integrated energy system can promote the coordination and complementarity of multiple energy sources and the cascade utilization of energy,which is of great significance to reduce the operation cost of the system,promote the consumption of clean energy and improve environmental benefits.Taking the integrated energy system as the main body,based on the integrated demand response strategy,carbon trading mechanism and model predictive control method,this paper focuses on the multi time scale low-carbon economic optimal scheduling problem of the integrated energy system considering the integrated demand response.The main research contents are as follows:(1)Firstly,this paper introduces the basic concept and research background of integrated energy system,and expounds it from four aspects: the research status of operation and planning of integrated energy system,the research status of integrated demand response and carbon trading mechanism in integrated energy system,and the research status of multi time scale scheduling strategy.Secondly,the basic structure of integrated energy system based on energy hub is established,and the steady-state mathematical models of cogeneration system,gas-fired boiler,electric to gas equipment,refrigeration equipment and multi-source energy storage equipment are constructed.Finally,the uncertainty of renewable energy output and load is simulated,and the corresponding processing methods are proposed,which lays a foundation for the later research.(2)A low-carbon economy coordinated dispatching strategy of integrated energy system considering comprehensive demand response and reward and punishment ladder carbon trading mechanism is constructed.Firstly,in order to reduce the carbon emission of the system,the reward and punishment ladder carbon trading mechanism is introduced into the optimal scheduling model of the integrated energy system.Secondly,according to the flexible characteristics and schedulable value of power,heat,cooling and gas loads,a perfect price based comprehensive demand response model is established.Finally,taking the minimum sum of energy purchase cost,operation and maintenance cost and stepped carbon transaction cost as the optimization objective,a low-carbon economic scheduling model of integrated energy system is established.The example simulation sets different scenarios for comparison,and verifies the effectiveness of the reward and punishment stepped carbon trading mechanism and the comprehensive demand response strategy in improving economy and environmental protection.Through the collaborative optimization of the two strategies,the low-carbon and economic operation of the comprehensive energy system can be realized.(3)In order to solve the impact of renewable energy output and load forecasting errors on system optimization scheduling,based on the daily scheduling results and the model predictive control method,a two day time scale rolling optimal scheduling strategy based on the incentive integrated demand response strategy is established.Firstly,considering the response differences of multiple loads such as cold,heat,electricity and gas under different time scales,an intra-day incentive comprehensive demand response model is established based on the day ahead price comprehensive demand response model.Secondly,considering the response ability of electric energy,cold,heat and gas energy on different time scales,the intra-day rolling optimization models of long-time scale scheduling and short-time scale scheduling are established respectively.In the intra-day long time scale scheduling model,taking 15 min as the time scale,a rolling optimal scheduling model is established to minimize the sum of energy purchase cost,adjustment penalty cost of each equipment and compensation cost of stepped demand response,so as to adjust the output of each energy equipment;In the intra-day short time scale scheduling model,the scheduling time of electric power is short.Taking 5min as the time scale,the fluctuation of electric power is stabilized by changing the power purchase power,introducing super capacitor and reducing electric load.The simulation results verify that the synergy of the proposed dual time scale rolling optimal scheduling strategy and the intra-day incentive comprehensive demand response strategy can effectively reduce the impact of source and load prediction errors on the system operation,and further improve the economy and stability of the integrated energy system.