| The natural gas distributed combined cooling,heating and power system has the advantages of high efficiency,environmental protection,low carbon and energy saving,safety and reliability,and is an important way for my country to achieve "carbon peak and carbon neutrality".At present,the natural gas distributed cooling,heating and power system has problems such as relatively traditional structure,backward operation strategy,and redundant equipment configuration.It cannot maximize the benefits of the system.Therefore,scientific planning,design and operation management of the system is to achieve its rapid The key to efficient development.This paper first proposed five natural gas cooling,heating and power supply schemes including SP,CCHP,CCHP-HP,CCHP-ST,CCHP-HP-ST,and established a multi-objective optimization model for each scheme,including multiple manufacturers,multiple models,and various Category of equipment database.Secondly,according to the building load and energy price of a hospital in Shandong,the SP,CCHP,and CCHP-HP were optimized and solved with the comprehensive index as the objective function,and the equipment selection optimization results,evaluation index optimization results,and equipment optimization results of each program were obtained.Real-time output in the state,and compare and analyze the optimization results.The results show that compared with SP,CCHP and CCHP-HP can greatly improve the comprehensive performance of the energy supply system by 40.6%and 46.9%,respectively.It also shows that the addition of ground source heat pumps can also greatly improve the comprehensive performance of the cogeneration system.Then,under the same load and energy price,the overall performance is still the best,and the CCHP-ST and CCHP-HP-ST added to the energy storage device are optimized.The result shows that the energy storage device does not greatly improve the overall performance.Therefore,the most economical optimization analysis was carried out for CCHP-HP-ST,which proved that the energy storage device has the characteristics of "peak cutting and valley filling",which greatly improves the economic efficiency.After comparison,CCHP-HP-ST is the current best overall performance solution,so its influencing factors need to be analyzed.The results show that when the price of natural gas is low and the price of electricity is high,compared with SP,the comprehensive performance of CCHP-HP-ST is adopted.The lifting effect is more obvious;under current conditions,no type of battery can bring benefits to CCHP-HP-ST.Finally,the reliability of the natural gas distributed combined cooling,heating and power system is analyzed from the grid faults and equipment faults.When considering the grid failure,the system starts to operate in an isolated grid.The optimization scheme obtained by the optimal comprehensive index is not much different from the grid-connected operation.Compared with the optimized scheme obtained by the economic index,the grid-connected operation will increase the equipment capacity configuration and reduce Economical,but will improve overall performance.When considering equipment failures,the optimization plan obtained with the best comprehensive indicators will increase the number of equipment of various types and the total capacity configuration,but the single capacity of each type of equipment will decrease,thereby reducing the impact of equipment failure on the system energy supply,Improve system reliability. |
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