Study On Grid Connection Synchronous Control Of AC-Excited Doubly-Fed Generator

With the increasing capacity of wind power generators,the current impact on grid connection could not be ignored,thus the grid connection techniques should be investigated in depth.First, this dissertation analyzes DFIG operation theory, including mathematic model of DFIG coordinate transformation, DFIG operation characteristics, which establishes the theoretical foundation for succeeding study. The second, the strategy of grid connection synchronous control of AC-Excited Doubly-Fed generator was put forward based on flux oriented vector control principle of double feed induction generator. The double feed induction generator no-load model and grid-connection synchronous control system model were established by analyzing the control regulation of the station voltage frequency,magnitude and phase. At least, the result of the simulation and experiment showed that the control strategy can effectively control that the stator voltage frequency,magnitude and phase is the same as the electrical network,and is an ideal approach to realize the fast and no-impact-current cutting-in network.