Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Analysis of Neutral Point Current in T-Type Three-Level PWM Converter
Authors Kui-Jun Lee
DOI 10.6113/TKPE.2020.25.1.68
Page pp.68-71
ISSN 1229-2214
Keywords Converter; T-type; Three-level; Neutral point current; Modeling
Abstract As a T-type three-level PWM converter has several intrinsic advantages, it has been widely studied for many applications. However, it requires an additional voltage control loop for balancing each DC link voltage. Generally, satisfying this requirement involves the use of an offset voltage to provide a neutral point current without affecting other variables, such as the total DC link voltage and three-phase input current. In this study, the theoretical relationship between the offset voltage and the neutral point current is analyzed. The results can be beneficial for effective voltage balancing controller design. The effectiveness of the analytical modeling is verified by simulation and experimental results.