| Energy Internet,as an important strategy of energy development,has been widely focused recently in China.Integrated energy system is an economical and efficient way of energy utilization.When the combined heat and power distributed generation(CHP-based DG)accessing into the integrated energy system,power flow will be redistributed,and the economy of the energy system will be change,too.Based on the analysis of the multi-energy flow,this thesis studied the sitting and sizing of the CHP-based DG in the integrated energy system.The specific work is as follows.Firstly,this thesis analyzed the model of the electric network,district heating network and the gas network.Then,this thesis introduced the basic principle of distributed co-generation system,and analyzed the economic characteristics.We have analyzed several aspects when the CHP-based DG accessing into the energy system.Through the research on its output characteristics,we analyzed the distribution of power flow,voltage distribution and network loss in the power grid;the hydraulic state in the heating network;the gas supply reliability and the distribution of the gas flow in the gas network.It provides the theoretical basis for the following study.Secondly,based on the traditional methods of power flow calculation and the basic mathematical model of the power grid,we proposed a power flow method to calculate the power flow,mass flow and gas flow in integrated energy system.Thus,the power flow distribution mechanism can be illustrated well.Finally,we have proposed an optimal sitting and sizing model of the CHP-based DG in integrated energy systems.In this model,the object is to minimize the network loss,and we considered the operation constraints of the power grid,heating system and gas system.As shown in the conclusion,it is more scientific to take the operation constraints of all the energy system into consideration,rather than one or two energy system.This conclusion is benefit to the integrated energy system planning. |
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