“…Various control algorithms 2 have been developed for the BDFRG including scalar control [3,22], primary voltage vector-oriented control (VOC) [3,13,14,22], primary flux (field)-oriented control (FOC) [13,14], direct torque and flux control [22,23], direct torque and reactive power control [24,25], direct power control [26], sliding mode power control [27], and even non-linear Lyapunov control theory [8]. Although a comparative qualitative analysis of some of these control methods has been partly made in [22] (and more detailed for the DFIG in [15,21]), no similar quantitative study, other than that in [22], has been reported specifically on FOC versus VOC of large BDFRG wind turbines, and there has been very little theoretical or applied work published on true FOC for this machine in general.…”