Abstract
This paper presents the modeling of the wind power system and low voltage ride through (LVRT) techniques for doubly-fed induction generator (DFIG) wind energy system. Firstly the equivalent circuit and power transfer principle of DFIG are reviewed. A simulation model of DFIG system has been constructed in PSCAD, where the gird-side double closed loop vector control strategy is used to maintain a constant DC bus voltage and compensate for reactive power at power grid, while the stator-flux-oriented vector control is adopted in rotorside converter to achieve maximum power point tracking (MPPT) for the DFIG wind turbine. LVRT techniques of DFIG are investigated and crowbar protection circuits were researched for this DFIG wind energy system.
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