Research On Optimal Planning And Operation Of Park-level Integrated Energy System

Under the dual carbon goal,with the development of renewable energy and combined cooling,heating and power(CCHP)technology,the comprehensive energy system of industrial parks has achieved multi-energy coupling of power distribution systems,natural gas networks,generators,and centralized heating/cooling.When planning such a system,it was essential to fully consider the organic synergy of future trends in heating,cooling,and electricity demand and energy production,coupling,and storage to improve the system’s energy efficiency.This paper first established the framework of the comprehensive energy system of the industrial park based on the definition of an energy hub.The paper analyzed the energy flow between various equipment in the system based on the operation of the equipment and the energy balance of the system,and introduced the optimal operation strategy with the lowest system total cost under a stepped electricity price.Secondly,most industrial parks had short-term planning,which led to problems such as redundant or insufficient equipment capacity,overinvestment,and a decline in functionality and quality.To address this,the paper proposed a multi-stage planning model for the comprehensive energy system of the industrial park that considered temporal construction.The park’s cycle was divided into multiple stages for planning,and the system was planned in the initial stage of each stage based on the growth of the park’s load,equipment capacity decay,and changes in investment costs,with the total cycle’s lowest cost as the objective function and the equipment’s operating status and power balance as constraints.A multi-stage planning model was established accordingly.To consider the impact of carbon trading costs on park planning,the paper added carbon trading costs to the objective function and proposed a low-carbon economic operation strategy considering carbon costs.The paper analyzed the changes in system equipment capacity,relevant economic indicators,carbon emissions,and photovoltaic energy penetration rate after the introduction of carbon trading costs and examined the impact of different carbon trading prices on the comprehensive energy system of the industrial park.Finally,using one year’s data as an example,the paper introduced a stepped carbon trading mechanism and analyzed its impact on the system’s operation mode,as well as the operating status of different equipment on typical days under different carbon trading prices.The results showed that after considering multi-stage planning,the capacity of photovoltaic equipment,CCHP units,and gas boilers increased,while the capacity of the battery decreased,and the system’s economy and carbon emissions both improved.On the basis of multi-stage planning,considering carbon trading,the capacity of CCHP units increased,the capacity of gas boilers decreased,and other equipment changed slightly.Although the system’s operating cost increased slightly,the total cost decreased,the system’s carbon emissions decreased significantly,and the trends of various parameters changed similarly as carbon trading prices increased.Changes in carbon trading costs affected the system’s operating mode and made it possible to achieve low-carbon operation at a lower carbon trading price during the heating season.This paper studied the planning method of the comprehensive energy system of industrial parks,analyzed the impact of temporal construction and carbon trading costs on the system planning,and proposed the best operating mode under different carbon trading prices,providing guidance for the planning and low-carbon economic operation of the comprehensive energy system of industrial parks.