Research On The Method Of Generator Interconnection Based On Flow Controller

With the rapid development of smart grid,problems of generator interconnection on the gird and the grid synchronization gradually become the focus of research.Aiming at these problems,this dissertation presents a method for grid interconnection using the current controller in facts equipment,makes in-depth theoretical study on the feasibility of the interconnection method.Dissertation first elaborates the background of the research on the generator interconnection problems in the smart grid,introduces the research situation and trend of generator interconnection problems in the smart grid at home and abroad.Through the study of the existing gird interconnection method,comparing the existing gird interconnection method and the proposed gird interconnection method based on the current controller in this paper,analyzing the advantages of grid method based on the current controller.Then the application of the current controller is expounded in the smart grid,through the study on topology structure and internal working mode of current controller,a detailed explanation on the working principle of the current controller using on gird interconnection is made.At the same time,functions of the current controller on current regulation and reactive power compensation after interconnection are discussed simply.Next the mathematical property of the current controller is analyzed.Through the study on topology structure and working principle of the current controller,the double power source equivalent is given to be its steady-state mathematical model.The State matrix equations of parallel side and serial side are listed respectively,and the transient mathematical model of the current controller is established.This dissertation makes a detailed analysis on the control strategies of the current controller using on generator interconnection.First of all,combined with the steady-state model,we give the constraint conditions and the controlled parameters of the current controller.Second,by analyzing the transient model,using the small signal analysis method,the transient control model and control block diagram of the controller in series and parallel sides are obtained.Finally,the control method is determinded after a large number of data access,comparing a variety of control methods,the PI decoupling control method is decided to use to control the current controller.Finally,a low voltage grid model by the existing equipment is made in laboratory,and the simulation model of generator interconnection system based on current controller is established in the simulink software.The feasibility of this method is validated through the experiment and simulation results.