Review of Voltage Regulation of a Doubly-Fed Induction Generator Based Wind Power Plant under Grid Faults

The voltage at all buses in a power system should be kept constant in order to achieve voltage regulation. This manuscript evaluates various voltage regulation control schemes for a wind power plant (WPP) that uses a doubly-fed induction generator (DFIG). These regulation schemes are particularly appropriate in injecting the reactive power to fortify the voltage at the point of interconnection (POI) throughout a disturbance without using external devices such as flexible AC transmission system (FACTS) devices in a WPP. The control schemes employed in the DFIG and WPP controllers are reviewed, and all the control schemes employed in them are also classified. DFIG controllers are operated in the voltage control, reactive power, and reactive current control modes whereas the WPP controller either activates in reactive power control or voltage control modes. Based on the classification, this paper depicts the merits and demerits of each control scheme, compares them, and also shows broad space for further research. The comparative results are likely to be useful to researchers and engineers involved in the field of voltage regulation of DFIG-based WPP.