*7.1.2 Influence of load disturbance*

During the operation in the entire operating range, the dynamics of the synchronous generator vary significantly. The sliding mode controller with the calculated parameters was stable and robust and displayed the effective damping in all operating conditions. The theoretical analysis of the invariance of the proposed control system to the disturbances and the variation of the plant parameter are described in detail in [20].

In this work, the results of the two most extreme operating points are presented (the same operating points as described in Section 3.2):


**Figure 25** shows the generated electrical power and rotor speed at operating point *P* = 1.0 [pu] and *Q* = 0.1 [pu], and **Figure 26** shows both quantities at operating point *P* = 0.1 [pu] and *Q* = 1.0 [pu].
