| The independent Combined Cooling,Heating and Power Systems(CCHP)and renewable energy resources will be integrated in a certain region to integrate regional integrated energy systems(RIES).This is an important means to realize the integrated complementary and cascade utilization of different tastes of energy.It can also improve the comprehensive utilization rate of system energy and optimize the energy structure.Among them,as a new generation of regional energy system,the gas CCHP system has the advantages of energy saving,high efficiency,safety and environmental protection,and it can further improve the performance of the system by coordinating and complementing with renewable energy,which has attracted attention from all walks of life.As a mature and green energy-saving technology,air source heat pump(ASHP)is an effective means to rationally utilize renewable energy.It has also received extensive attention.Therefore,it is of great significance to study the combined energy supply system of gas CCHP system and ASHP.In this paper,a RIES with complementary integration of gas CCHP system and ASHP is proposed.Based on this,the modeling and simulation of the RIES are carried out.This paper has done an in-depth study on this RIES.In this paper,a RIES is constructed,which integrates the gas CCHP system with ASHP.The system structure and operation strategy are analyzed and introduced.In order to make the system better match the change of dynamic load,a new improved mixing operation mode is proposed on the basis of the common operation modes of following the thermal load and the electric load.Under this operation mode,the system ensures that the energy is not wasted and the electricity purchased from the power grid is the least.The simulation model of RIES is built on TRNSYS.Taking a community in Qingdao as an example and according to the principle that the dynamic cooling,heating and electricity load demand of the building matches the dynamic characteristics of the system,the capacity of the main equipment of the system is preliminarily designed.On this basis,the performance of the system under the three operating modes is simulated.The operation results of the system in heating season,refrigeration season and the whole year under three operation modes are analyzed and studied respectively.The cooling,heating,power supply and natural gas consumption under three operation modes are compared.The results show that the consumption of natural gas in the improved mixing mode is 16% less than that in the following the thermal load mode and 19% less than that in the following the electric load mode.Under the improved mixing operation mode,the dynamic capacity of the system matches the dynamic cooling,heating and power load demand of the building,which has better reliability and energy saving advantages.Considering the influence of energy,economy and environment,the primary energy saving rate,annual cost saving rate and shadow cost saving rate of environmental pollutants are weighted to get the multi-objective optimization function,and the main equipment configuration of the system is optimized.The energy saving and environmental protection of the system under different capacity configurations are compared and analyzed with the traditional distribution system.The results show that the advantages of energy saving and environmental protection are significant.The maximum primary energy saving rate is 6%,and the maximum shadow cost saving rate of pollutants is 68%.The sensitivities of the operation performance of the system are analyzed when the price of natural gas and electricity changes.The results show that in a certain range of price fluctuations,the comprehensive performance of regional integrated energy system is higher than that of traditional distribution system,and the higher the electricity price,the lower the natural gas price,the better the comprehensive performance of the system.The regional integrated energy system proposed in this paper has superior energy-saving and environmental benefits,and achieves a high-efficiency,energy-saving,clean and environmental protection mode of energy supply. |
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