2.4.1 Electrically excited synchronous generator:
The EESG is usually built with a rotor carrying the field system provided with a DC excitation. The stator carries a three-phase winding quite similar to that of the induction machine. The rotor may have salient poles or may be cylindrical. Salient poles are more usual in low-speed machines and may be the most useful version for application to direct-drive wind turbines. A grid connection scheme of EESG for
direct-drive wind turbines is shown in Fig. 6.