Research On Power Supply Coordination Technology In Microgrid

Since the establishment of People's Republic of China,all aspects in China have developed quickly.Especially in the past four decades,China has made remarkable economic achievements,which have brought about energy and environmental problems.Compared with traditional large power grids,distributed power generation technology has advantages of flexible control,clean and high efficiency,and can be used for short distance transmission instead of long distance transmission to reduce the burden of long distance transmission^[1]Just as"a coin has two sides",distributed generation also has the disadvantages of intermittent,uncontrollable and difficult coordination with the power system.Due to these characteristics,the concept of microgrid is gradually known to everyone,which actually includes Distributed power supplies,energy storage units,inverters,loads,etc^[2],which are connected together to play a role according to a specific planning design.Among them,the very rich types of distributed power supply provide users with a wide range of output options,and to ensure the reliable and stable operation of the system,effective control strategy is particularly important.Therefore,this paper mainly studies the coordinated control method of micro power supply in micro grid.First,a brief introduction to the latest academic developments of microgrid and microgrid control strategies is presented.Then,based on the current development status of distributed power generation,control of a series of micro sources such as photovoltaics,wind powers,fuel cells,and battery energy storages.The analysis and research of the model provides a solid foundation for the subsequent research on power coordination technology in the microgrid.Then,in order to perform reasonable and effective control of the micro power supply,on the premise of analyzing the traditional PQ control,VF control and droop control,optimize the VF control,and the correctness and effectiveness of the model was demonstrated.On this basis,the control mode of microgrid is further discussed.Aiming at the sudden change of electricity quantity when the operation mode of microgrid changes,a smooth switching control strategy for the operation mode change of microgrid is put forward and its principle is analyzed.Finally,based on the basic premise of constructing each micro-power control simulation model,this paper tries to further construct the multi-source model.Through the PSCAD software simulation,this paper expounds the coordination simulation process of micro-power in the micro-grid,and evaluates the simulation results,so as to obtain the correct and effective full support of the theory.