A suitable PWM for DC-link voltage equalization of Three-Level Neutral-Point Clamped Converters

Author

Damiano, Alfonso ; Marongiu, Ignazio ; Porru, Mario ; Serpi, Alessandro

Author_Institution

Dept. of Electr. & Electron. Eng., Univ. of Cagliari, Cagliari, Italy

fYear

2013

fDate

10-13 Nov. 2013

Firstpage

328

Lastpage

333

Abstract

A novel DC-link voltage equalization algorithm for Three-Level Neutral-Point-Clamped Converters (NPCs) is presented in this paper. It mainly consists of appropriate pulse width modulation patterns, which are alternatively employed in order to exploit the DC-link capacitors differently, for a given reference voltage space vector. Thus, the most suitable PWM pattern is chosen in each sampling time interval in accordance with DC-link voltage equalization needs, without affecting NPC performances in terms of output voltage and current waveforms. The worth and effectiveness of the proposed equalization algorithm are verified through a simulation study, which refers to the case of a Surface-Mounted Permanent Magnet Synchronous Machine (SPM) fed by a three-phase NPC.

Keywords

PWM power convertors; permanent magnet machines; synchronous machines; PWM pattern; SPM; current waveforms; dc-link voltage equalization algorithm; pulse width modulation patterns; reference voltage space vector; surface-mounted permanent magnet synchronous machine; three-level neutral-point-clamped converters; three-phase NPC; voltage waveforms; Capacitors; Pulse width modulation; Rotors; Switches; Torque; Vectors; Voltage control; Neutral-point clamped converter; Neutral-point voltage balancing; Pulse width modulation; Three-level converter;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics Society, IECON 2013 - 39th Annual Conference of the IEEE

Conference_Location

Vienna

ISSN

1553-572X

Type

conf

DOI

10.1109/IECON.2013.6699157

Filename

6699157