4.8 Article

Cascaded Multioutput Multilevel Converter: Modulation and Operating Limits

Journal

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 69, Issue 1, Pages 399-408

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3050374

Keywords

Switches; Topology; Modulation; Multilevel converters; Hamming distance; Switching frequency; Cost function; Dual-output converters; multilevel converters; optimal state; power losses; switching frequency

Funding

  1. School of Electrical and Electronic Engineering, Nanyang Technological University
  2. Ministry of Education, Singapore [1-2018-T1-002-109 (RG171/18)]

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This article presents the modulation and operating limits of the modified cascaded multioutput multilevel converter. A phase-disposition pulsewidth modulation strategy is developed to minimize device switching. The number of device transitions is evaluated using a Hamming distance-based cost function, and the optimal state is identified. The operating limits of the converter are analyzed to ensure safe and valid operation.
This article presents the modulation and operating limits of the modified cascaded multioutput multilevel converter. A phase-disposition pulsewidth modulation strategy is developed to apply the optimal state that leads to a minimized device switching. A Hamming distance-based cost function is adopted to evaluate the number of device transitions. The cost function is further modified to identify the optimal state from a number of feasible states. Moreover, the operating limits of the converter are analyzed for the safe and valid operation of the converter. Simulation and experiment results validate the theoretical analysis, and the converter is operational under a wide range of operation points. The proposed optimal state modulation strategy is shown to be effective in reducing the average device switching frequency.

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