Decentralized Carrier Interleaving in Cascaded Multilevel DC-AC Converters

Gabsu Seo, Soham Dutta, Rahul Mallik, Branko Majmunovic, Satyaki Mukherjee, Dragan Maksimovic, Brian Johnson

Research output: Contribution to conferencePaperpeer-review

16 Scopus Citations


Cascaded dc-Ac converters with interleaved carriers are commonly used in applications where elevated voltages and low-distortion multilevel waveforms are needed. Example applications include modular multilevel converters and solid-state transformers. In such systems, carrier interleaving is generally achieved via communication among the stacked converters or a centralized controller. Due to the large number of converters in such a system, existing approaches entail significant wiring complexity and communication may limit resilience to failures. In this paper, we introduce a control strategy which achieves communication-free carrier interleaving among series-connected converters. The proposed controller is embedded within each converter control loop and only requires measurements available at each set of converter terminals. We formulate a dynamic system model and show that the system converges to the interleaved condition irrespective of the number of converters in the stack. After outlining a practical method for digital implementation, experiments are shown on a hardware-in-The-loop setup.

Original languageAmerican English
Number of pages6
StatePublished - Jun 2019
Event20th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2019 - Toronto, Canada
Duration: 17 Jun 201920 Jun 2019


Conference20th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2019

Bibliographical note

See NREL/CP-5D00-74846 for preprint

NREL Publication Number

  • NREL/CP-5D00-74062


  • cascaded H-bridges
  • communication-free interleaving
  • decentralized control
  • phase-shifted PWM
  • Switch interleaving


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