Research On Interval Method Based Optimal Planning For Multi-energy Microgrid Considering Uncertainties Of Renewable Sources And Energy Demands

The use of renewable energy is to achieve energy structure transformation and key measures to promote energy revolution,with the continuous penetration of energy Internet and the concept of integrated energy system and the continuous upgrading of technology,as an important organizational form of renewable energy,energy structure and energy of micro grid form is changing,is no longer a single power supply system.The planning and operation of traditional energy systems are limited to single forms of energy,such as electricity,gas,heat and cold,which cannot give full play to the complementary advantages between energy sources.Energy utilization efficiency,consumption of renewable energy,energy conservation and emission reduction are confronted with bottlenecks.Therefore,it is of great significance to carry out the research on the planning of micro-grid with multiple energy sources co-complementing each other to implement the national energy strategy and build a clean,low-carbon,safe and efficient modern energy system.After knowing subject background significance,on the basis of this paper firstly combed the pluripotent complementary micro grid(MEMG)system contains device type,combining with the physical properties of the device respectively carries on the reasonable and effective mathematical modeling,analysis of the operation characteristics of the power system and equipment,at the same time,which is based on cold and hot electricity three bus,detailed expounds the coupling relationship of various energy flow and flow process;Then,on the basis of the modeling of the power supply equipment,the power network power flow constraint and the heat pipeline heat transfer constraint in the MEMG system are taken into account.In other words,the network topology of the system is considered.The investment cost of the whole year is taken as the objective function.Finally,to fully consider renewable energy uncertainty influence on system planning and operation,puts forward the MEMG system planning method based on the source and load interval,the interval numbers to describe and depict uncertainty,and through the interval linear programming(ILP)theory to the mentioned model is modified and simplified,ensure that on the basis of considering uncertainty still can complete the optimizing calculation model.Through the example analysis,the necessity and rationality of considering the network operation constraints are verified,the specific planning scheme and operation strategy to the nodes are defined,and the traditional power flow calculation method is used to compare the linear power flow model adopted.The experiment proves that the error is very small,and the application in the MEMG system planning is reasonable and effective;at the same time,the MEMG with uncertainty is also proved Interval planning method can improve the robustness of system energy supply,which is of great significance to guide the future stable energy supply of the system.