Capacitor Voltage Regulation in Single-DC-Source Cascaded H-Bridge Multilevel Converters Using Phase-Shift Modulation


Cascaded H-bridge multilevel power electronic converters generally require several dc sources. An alternative option is to replace all the separate dc sources feeding the H-bridge cells with capacitors, leaving only one H-bridge cell with a real dc voltage source. This will yield a cost-effective converter. However, the required capacitor voltage balancing is challenging. In this paper, using the phase-shift modulation approach, a new control method for cascaded H-bridge multilevel converters fed with only one independent dc source is presented. The proposed method has a wide voltage regulation range for the replacement capacitors in the H-bridge cells. Experimental and simulation results support the proposed control method.


Electrical and Computer Engineering

Keywords and Phrases

Bridge Circuits; Electric Inverters; Modulation; Phase Shift; Phase Shifters; Voltage Regulators; Capacitor Voltage Balancing; Capacitor Voltages; Cascaded H-Bridge Converter; Cascaded H-Bridge Multilevel Converters; DC Voltage Sources; H-Bridge Cells; Multilevel Converter; Phase Shift Modulation; Capacitors; Capacitor Voltage Regulation; H-Bridge Cell

International Standard Serial Number (ISSN)

0278-0046; 1557-9948

Document Type

Article - Journal

Document Version


File Type





© 2013 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Sep 2013