Investigation of three-module converter structure in photovoltaic systems

DC voltage imbalance is a significant challenge in photovoltaic systems. These systems can consider as a current source. Therefore, a capacitor is parallel to the interface converter to meet the limitations of this source. By using the proposed modular structure, the voltage balance can establish. Perturb and observe (P&O) algorithm is used to obtain the maximum power point (MPP) of this system. This algorithm generates the reference currents of the inductors for the converter. A sliding-mode controller is considered to control these currents and balance the voltage at the output capacitors of the system. The three-module system with photovoltaic sources has been simulated using MATLAB/ Simulink software.