Figure 2 . SCIG based WECS Schematic.
2.2. Type 3 WECS
Type 3 WECS is based on the doubly fed induction generator (DFIG). In
this study, each DFIG is rated at 1.5MW
and in order to achieve a 9MW
capacity windfarm, 6 WECSs are considered operational. Fig. 3 shows the
general schematic. Field orientation schemes have been used for both the
rotor side controller (RSC) and grid side controller (GSC) with both
active and reactive power control achieved through the RSC using stator
voltage orientation scheme. DC link voltage control, on the other hand,
is achieved through the GSC using grid voltage orientation scheme.
Parameters of the DFIG are obtained from [22].