**4. Simulation Results**

To verify the effectiveness of the proposed NAC, simulations studies (Matlab/Simulink) have been carried out by comparing with the VC, GSPI and FLC. In this paper, a 2 MW PMSG-WT given in [35] is investigated. The parameters of the PMSG-WT system are listed in Table 1. In this paper, the mechanical rotation speed reference is *ω*mr = 2.2489 rad/s. The reference of d-axis stator current is *i*mdr = 0 A. The rated electromagnetic torque reference is *T*er = 889326.7 Nm. According to Equation (7), the q-axis stator current reference is *<sup>i</sup>*mqr = 593.3789 A.

**Table 1.** Parameters of PMSG-WT for simulation studies.


Parameters of NACs for subsystems *S*1, *S*2, and *S*3 are designed based on pole-placement and listed in Table 2. Please note that the controller parameters of the FLC are the same as that of the NAC for all three subsystems, and the FLC requires exact system parameters and full state measurements except d*V***d***t*.

**Table 2.** Parameters of Pitch control approach for simulation studies.

