March 2019

Conference Paper

Analysis of Circulating Harmonic Currents in Paralleled Three Level ANPC Inverters using SVM

By:
Niu, Jiahao; Zhang, Zheyu; Chen, Ruirui; Gui, Handong; Wang, Fei ; Tolbert, Leon M; Blalock, Benjamin J; Costinett, Daniel J; Choi, Benjamin
Page Number:
2481-2487
Book Title:
Proceedings of the IEEE Applied Power Electronics Conference and Exposition
Publication Date:
March 2019
Publisher Location:
IEEE, New York, United States of America
Conference Name:
IEEE Applied Power Electronics Conference and Exposition
Conference Location:
Anaheim, California, United States of America
Conference Sponsor:
IEEE
View DOI Listing:
https://doi.org/10.1109/APEC.2019.8722068

Abstract

In paralleled voltage source inverters (VSI), circulating current has both high frequency and low frequency components, and its spectrum highly depends on the modulation scheme. Previous research has mostly focused on the circulating current suppression for paralleled two-level VSIs. Little literature exists on similar analysis for paralleled three-level VSIs using space vector modulation. A detailed circulating current spectrum on full frequency range has not been well developed. This paper presents an improved analytical model for three-level space vector modulation (SVM), considering the impacts of regularly sampled reference and dead time. Then, circulating harmonic currents are determined across the full frequency range for various interleaving angles of two three-level ANPC inverters. The calculated harmonics are also verified by experimental results.