Design and analysis of 15-level inverter with a new voltage level generation method

Abstract

Multilevel inverters (MLIs) are commonly used in high-power applications for their ability to reduce Total Harmonic Distortion (THD) and improve power quality. However, the need for multiple DC sources in MLIs can increase complexity and cost. This study proposes a novel 15-level MLI topology that uses a High Frequency Link (HFL) to multiplex voltage levels, addressing these challenges. The goal is to reduce THD, voltage stress, and component count, while improving inverter efficiency. The method involves optimizing the transformer winding ratio using a cost optimization algorithm to minimize THD. The topology integrates multiple half H-bridge circuits, enabling the production of 15 voltage levels from a single DC source. Simulation and experimental results show that the proposed topology achieves a 5.4% THD, demonstrating improved performance over conventional 15-level MLIs. Additionally, it maintains high efficiency and low voltage stress, reducing power loss and confirming its applicability in industrial and renewable energy systems.