*6.4. Controller's Behavior under Input Voltage Variations*

The DC input voltage variations for the five control algorithms are represented in Figure 10. For this test case, the load resistor and the DC-DC buck converter parameters are all maintained at their nominal values. The DC input voltage is fixed at 400 v, and decreased to 350 v and 300 v at t = 0.05 s and t = 0.1 s, respectively. Comparative performances are extracted as represented in Table 3.

**Figure 10.** Input voltage variation: (**a**) evolution of the control voltage, (**b**) evolution of the control voltage and (**c**) evolution of the control voltage.
