**Scenario 2**

The 2/φ asymmetrical fault was implemented at t = 4.0 s, and then it was cleared at t = 4.5 s, as shown in Figure 6a. The 2/φ asymmetrical fault was lighter compared to the 3/φ symmetrical fault. However, the 2/φ asymmetrical fault was more severe than the 1/φ asymmetrical fault. The IT-2 FLC and T-1 FLC were separately implemented in the system during the 2/φ asymmetrical fault, as shown in Figure 6a. The rotor speed, DC link (*Vdc*), electromagnetic torque (*Te*), and the reactive and active power of the system with the IT-2 FLC had near nominal values and are given in Figure 6b–f, respectively. The rotor speed value with the T-1 FLC system increased to 1.4 p.u. in Figure 6b. The overshoot value of the DC link with the T-1 FLC system was 1400 V. The ripples in the DC link voltage value with the T-1 FLC system were higher than the proposed control system even after the grid fault time. The drop value of the active power with the T-1 FLC was 63% p.u., and the overshoot value of the active power with the T-1 FLC was 1.21 p.u. The ripple in the active power was greatly reduced by the IT-2 FLC. The reactive power with the T-1 FLC did not track the ideal zero value during the grid fault. The reactive power value with the T-1 FLC was 40% p.u. during the grid fault. The reactive power value with the proposed control system matched the ideal value perfectly both during and after the grid fault. The ripple of the electromagnetic torque value with the proposed control system was smaller than with the T-1 FLC system.

**Figure 6.** *Cont*.

**Figure 6.** (**a**–**f**)**.** Dynamic response of a 1.5 MVA permanent magnet synchronous generator (PMSG) with the type-1 fuzzy logic control (T-1 FLC) and interval type-2 fuzzy logic control (IT-2 FLC) systems during a 2/φ unsymmetrical fault.

The electromagnetic torque value with the IT-2 FLC system was the nominal value both during and after the grid fault.
