IMPACT OF UNEQUAL DC-LINK CURRENTS ON THE PERFORMANCE OF 5-LEVEL CURRENT-FED INVERTERS CONTROLLED BY SVPWM

Abstract

The performance of multilevel CFIs is significantly challenge by unequal DC-link currents. Variations in DClink current magnitudes can cause distorted output waveforms, increased harmonic content and reduced system efficiency. Traditional control strategies, which assume balanced DC-link currents, may no longer be effective under these conditions. This paper focuses on developing strategies for selecting switching state vectors for multilevel CFIs operating under unequal DC-link currents. The goal is to minimize the impact of current imbalance on the output waveform quality and overall system performance. The proposed strategies aim to ensure effective time sharing among switching states, optimize the distribution of current stress, and the goal is to minimize the of lower order-frequency harmonics in the output