Research On Dispatching And Planning Of Integrated Energy Systems S Considering Differences Of Multiple Functional Areas

In recent years,renewable energy,such as wind turbine power and photovoltaic power,has developed rapidly in China,and its proportion in the whole energy supply is increasing.However,there are many problems in many renewable energy-rich areas,such as thermal-electric coupling,inadequate local consumption capacity and limited capacity of transmission lines,asynchronization of power grid planning and construction,which make it difficult to improve the consumption of renewable energy.The integrated energy system can coordinate the dispatch of renewable energy,power supply system,cooling/heating system and other energy systems,which can realize the optimal utilization of various loads,effectively solve the problem of renewable energy absorption,and is an important direction of future energy system development.Irn this thesis,the following research work is carried out from the aspects of coordinated dispatching and planning of integrated energy system:In the aspect of integrated energy system dispatching,this thesis proposes a coordinated dispatching method which considers the differences of multiple functional areas and various forms of energy systems.Firstly,the different characteristics of heat and power loads in different functional areas and charging loads of electric vehicles are analyzed.Then,considering the thermal inertia and elasticity of heat/cooling loads,the models of heating/cooling systems in different functional areas are established,and the heating/cooling load balance is realized within each functional area according to the economic transmission distance of heating/cooling loads.Secondly,the charging loads model considering the spatiotemporal distribution of electric vehicles is established.The model uses the tie-line and the transferable charging load of electric vehicles to establish the relationship between the functional areas to achieve the electric load balance of the whole region.Finally,a coordinated dispatching model of integrated energy system considering the differences of multiple functional areas is established.Taking an actual distribution system in Jianshan district of Haining,Zhejiang Province as an example,it is verified that the model can effectively reduce the abandonment of renewable energy and restrain the fluctuation of renewable energy by improving the penetration of electric vehicles,increasing the capacity of tie lines,relaxing the indoor heating comfort index restriction and expanding the equivalent thermal resistance.In the aspect of integrated energy system planning,this thesis mainly studies the integrated energy system with the combined cooling,heating and power system as the core equipment,and puts forward a comprehensive energy system planning model considering the difference of multiple functional areas and the balance of cooling,heating and electric loads.Firstly,the characteristics of cooling,heating and electric loads in different functional areas are analyzed and typical load scenarios are established.Then,combined with the structure of integrated energy system,a comprehensive energy system planning model considering the difference of thermal and cooling loads in multiple functional areas is proposed.The validity and practicability of the model are verified by a demonstration area of an integrated energy system in Jianshan district of Haining,Zhejiang Province.The results show that the tie-line can make full use of the difference and complementarity characteristics of the multi-functional area to meet the cooling and heating load balance of the integrated energy system,and at the same time produce obvious economic benefits.