Multi-level converters have become increasingly popular due to high power quality, high-voltage capability, low switching losses, and low EMC concerns. Considering these advantages, the multi-level converter is a suitable candidate for implementation of future naval ship propulsion systems. This paper focuses on modulation techniques for the multi-level converter. In particular, a novel voltage-source method of multi-level 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 (DSP). 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 multi-level converters and an eleven-level cascaded multi-level H-bridge inverter.

Meeting Name

2001 IEEE Industry Applications Conference, 2001. 36th IAS Annual Meeting


Electrical and Computer Engineering

Keywords and Phrases

PWM Invertors; Bridge Circuits; Digital Signal Processing Chips; Digital Signal Processor; Diode-Clamped Multi-Level Converters; Electric Propulsion; Eleven-Level Cascaded Multi-Level H-Bridge Inverter; Four-Level Rectifier/Inverter System; High-Voltage Capability; Low EMC; Low Switching Losses; Modulation Techniques; Multi-Level Converter; Multi-Level Modulation; Multi-Level Voltage-Source Duty-Cycle Modulation; Naval Engineering; Naval Ship Propulsion Systems; Rectifying Circuits; Ships; Voltage-Source Method

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2001 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jan 2001