Study On Control Strategy Of Smooth Switching For Micro-Grid

With the serious problem of environmental pollution and energy crisis,distributed power(Distributed Generation,DG)research to become a hot spot,and in order to coordinate the contradiction between the grid and DG,and better to make large-scale integration and application of DG,Many experts and scholars put forward the concept of micro-grid.In this paper,the control strategy of micro-grid operation is studied.Firstly,the filter type of the inverter is determined,and the appropriate filter structure is selected.On this basis,the current vector PI control and the PQ constant power control strategy based on the dq coordinate system are analyzed respectively.Then,the inverter The sagging control strategy is compared and analyzed.In this chapter,the filter type of the inverter is analyzed,and the appropriate filter structure is selected.The appropriate filter parameters are obtained by analyzing.On this basis,the inverter control strategy of the grid mode and the island mode is studied.Secondly,the principle of silo island detection is expounded,and the appropriate detection method is selected.In this paper,we use the PQ-V / f control based on the master-slave control structure,and propose an improved amplitude tracking and phase synchronization for the different main control strategy of the grid and the island mode.And the synchronous output control method of the controller is used to realize the smooth switching of the microgrid.The feasibility of the proposed control method is verified by simulating the micro-network master-slave control model in Matlab / Simulink software.