Research On Optimal Operation Of Distribution Network Considering Microgrid

With the social and economic development of our country,the demand for energy is also increasing,which has caused the contradiction between energy utilization and environmental protection to become increasingly prominent.Therefore,vigorously developing clean,low-carbon and other new energy sources is the general trend of energy development in all countries.In the context of the energy revolution,Microgrid may be able to effectively deal with energy shortages and environmental problems,and it will be an important form of the future power system.For the problems such as power quality caused by more and more distributed power sources connected to the distribution network,the microgrid can integrate the distributed power sources as a whole into the distribution network,and realize the distributed power in the distribution network.The flexible and high-efficiency application of power distribution network provides power support.On this basis,this paper mainly studies the optimal operation of the microgrid after it is connected to the distribution network,and completes the following research contents:(1)This article first introduces related optimization algorithms for the optimal operation of the distribution network considering the microgrid.It summarizes the achievements of domestic and foreign microgrids.The characteristics of each distributed power model in the microgrid and the influence of active and reactive power on the voltage and active power loss of the distribution network are analyzed.(2)Secondly,this paper uses an improved particle swarm optimization algorithm based on dynamic weight coefficients.Three functions are used to test the applicability of the method,and the IEEE33 distribution network system is optimized and simulated.Then,the day-a-day optimization dispatch model of the microgrid is established with the goal of the economic operation of the microgrid and the method is used to solve the problem.Lay the foundation for optimized operation research.(3)Finally,this paper adopts a control strategy for optimal operation of the distribution network considering the microgrid.The voltage deviation degree of the distribution network is used as the upper-level optimization model,and the economic operation of the microgrid is used as the lower-level optimization model.Simulation experiments were carried out on the unsupported,weakly supported,and strong supported scenarios when the microgrid was connected to the IEEE33 and IEEE69 distribution network systems.The test results show that connecting the microgrid to the distribution network can not only realize the economic and optimized operation of the microgrid,but also reduce the network loss of the distribution network and improve the voltage quality of the distribution network.