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This paper examines the reactive power control capability of doubly fed induction generator connecting to distribution grid with and without the inclusion of capacitor banks. The dynamic response characteristics of the wind power generator in the case of fault in the network to assure the secure and reliable operation of wind farm is presented. The stator-flux- oriented vector control principle is applied to build a model of the doubly fed induction generator in dq synchronous coordination system and the simulation software is employed to investigate its performance into distribution grid of eleven nodes. Wind power may be considered one of the most promising renewable energy sources, but its integration into power systems has a number of technical challenges concerning security of supply, in terms of reliability, availability and power quality (1-3). Since penetration of wind power generation is growing, its impact on the connected power system must be analyzed. For this reason, grid connection requirements are established. In the last few years, the connection requirements have incorporated in addition to steady state problems, dynamic requirements, like voltage dip ride-through capability (4, 5). The most common requirements under these disturbances are low voltage ride through which usually implies: voltage profile immunity, reactive current injection, active and reactive power limitation under fault and recovery and limitation in reactive energy consumption (5, 6). In the past, before a serious failure in the electrical grid, energy conversion systems (WECS) were disconnected. However, due its penetration has been increased it is necessary that all time must remain connected, since they provide a large amount of power (7). The continuous operation under different perturbations is not easy to get, the control structure must ensure proper dynamic response. The major literature includes control structure to doubly fed induction generator (DFIG) connected to an infinite bus but does not contain all structure of the electrical grid (1, 8, 9). Analyzing a control scheme with a suitable model system largely ensure proper operation in actual conditions. Therefore, a comprehensive study of the electrical grid including WECS with detail control structure considering the effect of major disturbances and the behavior of voltage and power flows is required. cq cd r e cq r cq q c v i L dt di L Ri v

Analyzing Doubly Fed Induction Generator Impact in an Electrical Grid