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Doubly fed induction generator (DFIG)–based wind energy conversion system (WECS) has been found very effective in harnessing wind power. Conferring to grid code requirements, DFIG needs to stay connected to the grid under fault conditions. This implicates the requirement of enhancing the transient stability through augmenting the low-voltage ride through (LVRT) capability of DFIG. There are many software and hardware solutions for the improvement of LVRT. Fault current limiter is one of the frequently used hardware solutions for the argumentation of fault ride through requirements. Instead of LVRT, DFIG-based WECS also faces low inertia problems at fault condition. In this article, a combined approach of virtual inertia control with an external retrofit adaptive hysteresis control–based bridge-type fault current limiter (AHC-BFCL) is proposed to improve the LVRT capability as well as the inertia of DFIG-WECS. The results are compared with that of a conventional logic control-BFCL and proportional–integral-BFCL.

Enhancement in fault ride through capabilities with inertia control for DFIG-wind energy conversion system