Comparison behavior of the capacitor voltages balancing using linear and nonlinear controllers

One common way to evaluate the performance of a controller is to compare it with the classical controllers. In this paper, the behavior of a nonlinear controller for the two-module converter is compared with the classic PI controller. This converter is used to neutralize the issue of DC voltage imbalance. The comparison between an indirect sliding mode controller and a PI controller is completed. It is performed in two scenarios: in the first scenario, comparing the performance of the two controllers in the DC balancing of the capacitor voltages and in the second scenario, the dynamics of the input powers for photovoltaic and fuel cell application. To ensure the optimal PI performance, the control parameters are determined using an average linearized model of the system. To perform the modeling and the comparison, MATLAB/Simulink software is used. The simulation results verify that balancing of the capacitor voltage during the transient regime and the steady-state regime for both controllers.