Neutral-point Balancing of Neutral-point-clamped Three-level Inverter with a Front End Switched Rectifier DC Source for the Full Modulation Range

Abstract

A switched rectifier DC voltage source three-level neutral-point-clamped (NPC) converter topology is proposed here to alleviate the inverter from capacitor voltage balancing in three-level drive systems. the proposed configuration requires only one DC link with a voltage of half of that needed in a conventional NPC inverter. to obtain a rated DC link voltage, the rectifier DC source is alternately connected in parallel to one of the two series capacitors using two switches and two diodes with device voltage ratings of half the total DC bus voltage. the frequency at which the voltage source is switched is independent of the inverter and will not affect its operation since the switched voltage source in this configuration balances the capacitors automatically. the proposed configuration can also be used as a conventional two-level inverter in the lower modulation index range, thereby increasing the reliability of the drive system. a space-vector-Based PWM scheme is used to verify this proposed topology on a laboratory system. © 2009 the Institution of Engineering and Technology.

Department(s)

Electrical and Computer Engineering

International Standard Serial Number (ISSN)

1755-4543; 1755-4535

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2024 The Authors, All rights reserved.

Creative Commons Licensing

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Publication Date

01 Sep 2009

Link to Full Text

Share

 
COinS