*7.1. ISOS Control Strategy*

In this Section, the ISOS DC-DC converter overall control scheme is examined with the system parameters presented in Table 8. To test the controller's power balancing capability when handling uncertainties, the component parameters for each module are purposely assumed to be different, as presented in Table 8.


**Table 8.** Input-Series Output-Series (ISOS) converter parameters.

Talking about the simulation results, the control scheme presented in Figure 9c for the ISOS DC-DC converter is examined considering a reference current with a reflex-current profile to the total current flowing in the filter inductance. The charging pulse is applied, where the charging cycle begins at 0.2 s and ends at 0.6 s. After that, a rest period for 0.1 s is applied to the total filter inductor current reference signal. The results shown in Figure 10 demonstrate that the power-sharing controller presented in Figure 9c compensates for the negative influences resulting from the systems' parameters mismatch. In which, the individual filter inductor currents are equally shared between the three modules. Moreover, the total filter inductor current of the ISOS system follows the reference signal applied based on RC. It is worth mentioning that the results in this section, as well as the following sections, involve the number of signals presented in the legend. However, the signals are coincident, meaning that power balance control is achieved. Consequently, it can be concluded that the control scheme is reliable and achieves equal power distribution between the modules.

**Figure 10.** Simulation results for ISOS DC-DC converter: (**a**) modular filter inductor output currents and overall output current; (**b**) a zoomed-in illustration for the modular filter inductor output currents shown in (**a**).
