Controlling and operating analysis of DFIG wind generator between in a large utility network and in an isolated micro-grid

The rapid penetration of a large number of distributed generations poses new challenges for the safe and effective operation of the main grid. A better way to realize the emerging potential of distributed generation is to take a system approach which views generation and associated loads as a subsystem or a ldquomicro-gridrdquo. The DFIG with storage system is the main micro-source in this paper. The detailed model and control strategy of grid-connected doubly fed induction generator (DFIG) are developed by PSCAD/EMTDC, and on this basis the control strategy of DFIG in an isolated micro-grid is suggested, that is, the added DC link storage system of DFIG controls system frequency, load-side converter which is grid-side converter of grid-connected control program has to do the corresponding change to offer voltage sustaining. The results show that the proposed control strategies are reasonable and the islanded systempsilas frequency and voltage are able to be stabilized within the specified limit. Absolutely, the research lays the foundation for further study of micro-grid.