Modeling And Economic Operation Optimization Of A CCHP-type Microgrid

The Combined Cooling Heating and Power(CCHP)has high efficiency in energy utilization and low pollution in emission,and can satisfy different kinds of energy demands such as cooling,heating and power of the users.With the rapid application and promotion of smart grid technology,microgrid has been demonstrated to be an effectual carrier for distributed generation and to be a flexible and availably managerial platform for CCHP.Meanwhile microgrid can match limberly between the cooling,heating and power to raise both the economic and social benefit of the system.Microgrid economic operation optimization is an important part of investigating the operation and administration of microgrid and it has a direct effect on the validity and economical efficiency of microgrid.Aimed at system modelling and economic operation optimization of a CCHP-type microgrid,this paper carries out the related research work as follows:First of all,this paper gives an general study of general situation of development and research work about microgrid and CCHP at home and abroad,including the reasearch work of economic operation optimization.Based on a given microgrid energy structure,this paper firstly established the mathematical models of photovoltaic cell,energy storage battery,micro turbine and heat recovery device etc,and built a part-load-ratio model to the strong part-load effect equipments.Secondly,this paper built a CCHP-type microgrid economic operation optimization model aimed at minimizing operation cost and solved the model problem.Meanwhile,this paper also solve the corresponding model,constant efficiency equipment based system economic operation optimization model and compare the difference of the two results.Then with cooling,heating and power changed,27 examples are solved to analyze the error and its reason.Thirdly,Aimed at constant efficiency equipment based system economic operation optimization,load error caused by operating via the optimized input and increment caused by operating vis the optimized output are calculated and analyzed,which indicates the relative quality between part load ratio model and constant efficiency model.Finally,the effect of facrors such as the price of nature gas and electricity,load of cooling,heating and power,way of grid conecting on CCHP-type microgrid is analyzed,which provides foudation of operation strategies and electricity pricing policy.