Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 59, Issue 2, Pages 679-689Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2011.2157289
Keywords
Cascaded multilevel converter; fault condition; modulation strategy
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Funding
- Federal University of Santa Maria (UFSM)
- National Council for Scientific and Technological Development (CNPq)
- Coordination of Improvement of Higher Education Personnel (CAPES)
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This paper proposes a simple modulation approach for symmetrical and asymmetrical cascaded multilevel converters, suitable for operation under normal and fault conditions. Initially, the set of all possible converter common-mode voltages for linear operation is derived, considering the status of each converter cell. It is demonstrated that the methods previously described in the literature belong to the derived set. By properly selecting the common-mode voltage, the entire converter voltage synthesis capability can be achieved under any fault condition. The proposed modulation approach has been applied for both symmetrical and asymmetrical cascaded multilevel converters. Simulation and experimental results show the effectiveness of the proposed modulation approach and validate the theoretical analysis.
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