Fundamental frequency switching strategies of a seven-level hybrid cascaded H-bridge multilevel inverter

Zhong Du, Leon M. Tolbert, Burak Ozpineci, John N. Chiasson

Research output: Contribution to journalArticlepeer-review

297 Scopus citations

Abstract

This paper presents a cascaded H-bridge multilevel inverter that can be implemented using only a single dc power source and capacitors. Standard cascaded multilevel inverters require n dc sources for 2n + 1 levels. Without requiring transformers, the scheme proposed here allows the use of a single dc power source (e.g., a battery or a fuel cell stack) with the remaining n - 1 dc sources being capacitors, which is referred to as hybrid cascaded H-bridge multilevel inverter (HCMLI) in this paper. It is shown that the inverter can simultaneously maintain the dc voltage level of the capacitors and choose a fundamental frequency switching pattern to produce a nearly sinusoidal output. HCMLI using only a single dc source for each phase is promising for high-power motor drive applications as it significantly decreases the number of required dc power supplies, provides high-quality output power due to its high number of output levels, and results in high conversion efficiency and low thermal stress as it uses a fundamental frequency switching scheme. This paper mainly discusses control of seven-level HCMLI with fundamental frequency switching control and how its modulation index range can be extended using triplen harmonic compensation.

Original languageEnglish
Pages (from-to)25-33
Number of pages9
JournalIEEE Transactions on Power Electronics
Volume24
Issue number1
DOIs
StatePublished - 2009

Keywords

  • Fundamental frequency modulation control
  • Hybrid cascaded H-bridge multilevel inverter (HCMLI)
  • Triplen harmonic compensation

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