Voltage Balancing of the DC-Link Capacitors in Three-Level T-Type Multiphase Inverters

This article illustrates an algorithm to balance the voltages across the dc-link capacitors of a three-level multiphase inverter feeding a star-connected load with an odd number of phases. The proposed strategy keeps the dc-link capacitors balanced in any operating condition and minimizes the low-fr...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on power electronics 2022-06, Vol.37 (6), p.6450-6461
Main Authors: Vancini, Luca, Mengoni, Michele, Rizzoli, Gabriele, Zarri, Luca, Tani, Angelo
Format: Article
Language:English
Subjects:
Algorithms
Capacitors
Electric potential
Fault detection
Induction motors
Inverters
Modulation
Multilevel converters
Multiphase
Oscillations
Oscillators
Pulsewidth modulation inverters
Space vector pulse width modulation
total harmonic distortion
variable speed drives
Voltage
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This article illustrates an algorithm to balance the voltages across the dc-link capacitors of a three-level multiphase inverter feeding a star-connected load with an odd number of phases. The proposed strategy keeps the dc-link capacitors balanced in any operating condition and minimizes the low-frequency voltage oscillations, even during open-phase faults and with non-sinusoidal output currents. Finally, the article identifies the operating region where the voltage oscillations of the dc-link capacitors can be canceled. The developed algorithm can maintain constant voltages even if the capacitors are unbalanced, and its performance is compared to that of other carrier-based algorithms. Experimental tests are carried out on a five-phase induction motor in healthy and faulty conditions.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2021.3137083