Proposed system based on a three-level boost converter to mitigate voltage imbalance in photovoltaic power generation systems
Mohammad Afkar, Roghayeh Gavagsaz‐Ghoachani, Matheepot Phattanasak, Jean‐Philippe Martin, Serge Pierfederici
Abstract
Voltage imbalance poses a challenge to photovoltaic systems. A modular structure based on a three-level boost converter is proposed to address this problem. The three-level boost converter offers advantages, such as a low current ripple and voltage stress, over a classic boost converter. These advantages offset the use of additional elements in the proposed converter circuit. Two capacitors are used in the proposed converter to enable the innovative connection between multiple sources and the three-level boost converter. The second capacitor of the first module is shared with the first capacitor of the second module. This structure is used in conjunction with a controller to balance the voltages in the system. The controller is based on an indirect sliding model, wherein the input current of each energy source and the output voltage balance are considered. The two-module system is simulated using Simulink MATLAB software. The simulation and experimental results validate the proposed system.