Planning And Operating Of Regional Integrated Energy System

With the development of society,human demand for energy is increasing and the oil,coal and other traditional fossil energy is depleting.The development of environment-friendly renewable energy and the improvement of energy efficiency is the focus of common concern in the world.Integrated energy system(IES),which can achieve graded use of energy and the complementation of advantages of various energy sources,is the first choice to solve the energy crisis and to relieve the environmental pressure.At present,studies about energy optimization management in IES are mainly concerned to independent combined cooling heating and power(CCHP).However,the type of users for the independent CCHP system is single and the load is uneven,which would inevitably lead to the low efficiency of CCHP,waste of capacity and so on.In addition,the current research focuses on the production and consumption of IES,and the transmission is rarely involved Therefore,in order to promote the energy optimization management of IES,the following work has been done in this paper:(1)Modelling of the integrated energy systemThe operationg characteristics of the renewable energy equipments,cogeneration equipments,storage equipments,refrigeration plants and other auxiliary equiments in integrated energy system is studied fizstly,and the corresponding mathematical models are established,which lay an important foundation of energy optimization management of IES.(2)A two-stage optimization model of CCHPCCHP,as one of the typical application of IES,has been maturely developed,meanwhile,along with the growth of smart grid,demand response(DR)has been developed fastly.Basing on the above,a two-stage optimization model of CCHP combing DR is proposed.Considering the combination of CCHP and grid in the supply side,in the first stage,the output of units is optimized to minimum the operational cost of CCHP.In the second stage,the users,according to the dispatch plan of CCHP and the real-time price of grid,optimize the load by integrating demand response to minimum purchase cost.(3)Optimization of integrated energy system considering thermal inertiaTo study the model of heating network and thermal load,realize the vertical intsegration among source,network and load in IES,the thermal inertia of heating system is studied in this paper,and the model of transmission delay in heating network and the storage model of buildings is established.Basd on this,a comprehensive optimization model of integrated energy system considering thermal inertia is put forward.The simulation is conducted in a real heating area in Jilin province and the simulation results show that the thermal inertia can effectively improve the economics and significantly reduce the abandoned wind power during morning and night time.(4)Collaborative planning of multi-district integrated energy systemTo improve the efficiency of units result from independent operation of a sigle region,develop an integrated energy system of collaborative planning and joint operation of multi region,firstly,a heating network is modelled,which can realize the ineraction of thermal energy among each district.Secondly,combined with the heat interaction balance constraints,a collaborative planning model of multi-district integrated energy system is proposed.Finally,the simulation is carried out in an integrated region in Tianjing.The simulation results show that the collaborative planning can effectively solve the problems,such as low energy efficiency and capacity waste,which exsit in independent planning.