A Level-Shift Carrier PWM Modulation Technique and Predictive Current Control of a Multilevel DC-AC Converter for Interfacing Renewable Energy Sources

The integration of renewable energy sources into the electrical power grid is a crucial aspect for achieving sustainable development and reducing environmental impacts. This paper explores the implementation of a three phase Neutral Point Clamped (NPC) DC AC converter with level shift carrier PWM modulation technique and predictive current control to facilitate the grid interconnection of renewable energy systems. Multilevel converters offer important advantages over traditional two level converters, such as reduced harmonic distortion and improved efficiency. Computational simulations using the PSIM software were conducted to validate the operation of the converter, both as active rectifier and as inverter. The results demonstrated the ability of the converter to adjust its current generation, even when considering sudden power variations in the load, as well as variations in the electrical power grid. Moreover, it effectively controls the DC link voltage, while maintaining a minimal ripple in the controlled AC current. The obtained results allow to verify the robustness and reliability of the converter for the integration of renewable energy (solar photovoltaic panels) into the power grid, contributing to the pursuit of sustainable energy solutions for a greener future.