| According to statistics released by the National Bureau of Statistics,the Bureau of Energy and other units and institutions in 2020,in the context of China’s current energy development,the domestic energy consumption structure is currently dominated by traditional fossil energy sources such as coal,natural gas,and oil.However,from the perspectives of saving energy,reducing nitrogen oxides,sulfur oxides,and greenhouse gases represented by carbon monoxide,carbon dioxide and other pollutants,and building an environmentally society,it is necessary to develop hydropower,tidal power,photovoltaic power generation,biomass power generation,wind power generation,represent green,clean and renewable energy that does not pollute the environment.The integrated energy system is a brand-new development direction of the traditional single energy utilization system.It is one of the specific realization forms of the internet of energy and the ubiquitous power internet of things proposed by the State Grid Corporation of China in 2019.This is to promote energy to be green,intensive,clean and environmentally friendly.The development of the direction of efficient distributed,refined and sustainable use provides new ideas.The emergence of an integrated energy system is a breakthrough in a single energy utilization system.It can connect natural gas,coal power,wind power,photovoltaics and other renewable energy through the grid,gas grid,and thermal network.It integrates cold,heat,electricity,and gas.Various forms of energy such as green electricity,coal-fired electricity,fuel oil,natural gas and other forms of energy can be centrally dispatched,complemented,and cascaded.This is an important direction of energy development.This new energy utilization method can not only effectively reduce the comprehensive operating costs such as system power purchase costs,equipment operation and maintenance costs,and gas purchase costs,but also enhance the stability of system operation,improve energy utilization,reduce energy consumption,and reduce carbon emissions.Comprehensive benefits are also of great significance.The park-level integrated energy system(IES)is one of the main forms of the integrated energy system.It is necessary to study the energy supply framework of the park-level IES system,the composition of various energy equipment,and the overall dispatching operation.This paper takes my country’s energy consumption structure and energy development trend as the subject research background,and takes the park-level terminal integrated energy system as the research object.Combining relevant research results at home and abroad,research has been carried out on two aspects: single-objective optimal dispatching operation of park-level integrated energy system considering uncertainty and setting chance constraints,and multi-objective optimal dispatching considering three indicators of economy,energy efficiency and environment,mainly including the following aspects:(1)Based on the review of relevant information on domestic and foreign information,this paper first conducted a deep research and analysis of the research background and significance of integrated energy systems.And the current domestic and foreign research status of integrated energy system chance constrained programming and multi-objective optimal dispatching are analyzed and summarized.The article focuses on the characteristics of the park-level integrated energy system(IES),and combing the research status at home and abroad of the regional IES and the park-level IES.(2)The energy supply structure of the park-level integrated energy system was constructed and the multi-energy flow analysis of cold,heat,electricity and gas was carried out.Based on this energy supply structure,this paper establishes a mathematical model of various energy production,conversion and storage equipment with the cold,heat and power combined supply system as the core.Electric vehicles and battery swapping station are used as electrical energy storage devices,and a mathematical model of heat storage devices is constructed.Based on the monte carlo simulation method and the probability distribution model of the attendance/charging behavior of electric vehicles and battery swapping station,the initial charging load calculation was carried out,and the chance constrained programming of the integrated energy system of the park and the multi-objective of economy,energy efficiency and environmental protection were studied for the follow-up prepare for optimal scheduling.(3)Taking the integrated energy system of the park as the research object,considering the uncertain factors that may exist in the park,setting the gas turbine thermal power reserve output and the reserve power market power purchase as chance constraints.Constructed a business park integrated energy system optimization dispatching model that takes into account chance constrained programming,including combined cooling,heating and power systems,heat storage devices,and battery swapping station,and set up calculation examples based on battery swapping station participation in demand response and chance constraints,To study the economic operation of business parks when considering uncertain factors,and provide a theoretical reference for park operators to determine the operation plan.(4)Considering the economic,energy efficiency and environmental protection requirements of the park’s IES during operation,a multi-objective optimization model of the park’s CCHP system is constructed that takes into account the integrated demand response.Take battery swapping station,electric vehicles,and central air-conditioning as the main body of integrated demand response implementation.An exergy efficiency model is established based on the second law of thermodynamics,and the exergy efficiency is used as an energy efficiency optimization index.Among them,the objective function of the economic optimization model is the minimum daily operating cost,the objective function of the energy efficiency optimization model is the maximum exergy efficiency,and the objective function of the environmental protection optimization model is the cost of pollutant emission treatment.This model is a typical 0-1 mixed-integer linear programming model,which constructs a comprehensive satisfaction index based on the analytic hierarchy process and linear weighting method.The study of the impact of different integrated demand response implementation scenarios on the optimization results can provide a certain reference for park operators in multi-objective optimization and decision-making. |
PDF Full Text Request