Research On Black Start Of Isolated Microgrid

Nowadays,the lack of energy becomes a serious problem with the development of the world.The distributed generation is a special technology by use of renewable energy.With the shortage of resources,distributed generation is widely used in microgrid.Some developed countries began to study the problem of black start in the last century in 70 s,China's current research on black start of grid is relatively mature,but the study on the black start of isolated microgrid still can not be ignored.Firstly,this paper introduces the research status of microgrid and black start at home and abroad,and instructs the necessity of studying the black start of isolated microgrid.This paper analyses overvoltage,self excitation and the time of black start,so as to supply different ways of black start of micro sourse.In this paper,the inverter control system and its mathematical model are studied and analyzed in the condition of grid and off grid operation.The switch which is used to realize the switch quickly and off the grid is selected.The three control methods of micro source in the process of black start are studied: PQ control,V/f control and Droop control and corresponding controllers are designed.The MATLAB simulation models are established to verify their results.This paper presents a microgrid topology for electric power development trend in our country,put forward a serial and parallel recovery combination of isolated black start of microgrid,and making the mode switching smoothly is based on the design of the network controller.The simulation model is established to verify this project,and from the simulation results it can be concluded that this project is feasible.