Multilevel converters have become increasingly popular due to high power quality, high-voltage capability, low switching losses, and low electromagnetic compatibility concerns. Considering these advantages, the multilevel converter is a suitable candidate for implementation of future naval ship propulsion systems. This paper focuses on modulation techniques for the multilevel converter. In particular, a novel voltage-source method of multilevel modulation is introduced and compared to existing methods. The proposed method is discrete in nature and can therefore be readily implemented on a digital signal processor. The method is also readily extendable to any number of voltage levels. Results of experimental implementation are demonstrated using a four-level rectifier/inverter system, which incorporates diode-clamped multilevel converters and an 11-level cascaded multilevel H-bridge inverter.


Electrical and Computer Engineering

Keywords and Phrases

11-Level Cascaded Multilevel H-Bridge Inverter; PWM Invertors; PWM Power Convertors; Bridge Circuits; Diode-Clamped Multilevel Converters; Electric Propulsion; Four-Level Rectifier/Inverter System; High Power Quality; High-Voltage Capability; Low Electromagnetic Compatibility; Low Switching Losses; Modulation Techniques; Multilevel Converter; Multilevel Converters; Multilevel Voltage-Source Duty-Cycle Modulation; Naval Engineering; Power Supplies to Apparatus; Pulsewidth Modulation; Rectifying Circuits; Ship Propulsion Systems; Ships; Sine Triangle; Space Vector; Switching Circuits; Voltage Source; Voltage-Source Method

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version

Final Version

File Type





© 2002 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jan 2002