The Optimal Design And Application Research Of Micro Energy Grid With CCHP And PV

The concept of energy Internet provides a new direction for building a green,low-carbon,safe and efficient modern energy system.Micro energy grid,as the energy Internet near user side,has become the focus of current engineering demonstration and pilot application with the advantages of small coverage space,flexible operation modes,and so on.With the development of renewable energy technology,the combination of photovoltaic(PV),wind power and other renewable energy has become a common development trend in the core structure of the combined cold,heat and power(CCHP)system.Micro energy grid involves a variety of energy sources including cold,heat and electricity,which contain both easy-to-control energy units and random energy units.How to rationally optimize its design,is very important for such a complex multi-energy system.Based on this,this paper carries out the optimal design and application research of micro energy grid with CCHP and PV.Firstly,the relevant theoretical knowledge of the micro energy grid is introduced,including the structure of CCHP system and the model of energy devices.Secondly,taking a residential area as the research object,the characteristics of cold,heat,electricity load and PV output are analyzed which lays the foundation for the optimal design of micro energy grid.Thirdly,the optimal design method and of micro energy grid and evaluating indicators.The optimal design of micro energy grid includes the system structure design and the capacity allocation of energy devices.The system design principles are introduced for the former.For the latter,the capacity allocation model of energy devices is constructed with the annual comprehensive cost minimization as the objective function.Finally,taking this residential area as an example,the optimal configuration results of micro energy grid are analyzed and explained,where the results suggest that the optimization scheme of micro energy grid is more economic,environmental and energy-saving,and economy and environmental protection with the increase of natural gas price.However,the economy,environmental protection and energy-saving becomes worse with the increase of natural gas price.The coordinated operations of micro energy grid in typical day have been analyzed.