A Novel Decentralized PWM Interleaving Technique for Ripple Minimization in Series-Stacked DC-DC Converters

Soham Dutta, Branko Majmunovic, Stayaki Mukherjee, Rahul Mallik, Gab-Su Seo, Dragan Maksimovic, Brian Johnson

Research output: Contribution to conferencePaperpeer-review

1 Scopus Citations

Abstract

Cascaded dc-dc converters are commonly used in applications where distributed energy sources or loads are connected to elevated voltage levels for power transfer. In such systems, it is advantageous to minimize the ripple on the bus current and voltage by proper phase shifting of the pulse-width modulation (PWM) pulses among the converters via a method known as interleaving. Existing approaches use either a centralized controller or separate communication lines among the stacked converters to control their relative PWM switch transitions. The key drawbacks are that these methods entail significant wiring, the central controller acts as a single point of failure, and implementation on very large numbers of units is impractical. In this paper, we introduce a decentralized interleaving control (DIC) strategy that acts on local current measurements at every converter and achieves communication-free PWM interleaving among the series-stacked converters. The proposed controller is simple in structure and is shown to converge asymptotically to the interleaved state irrespective of clock drifts among the digital signal processors. Experimental results are provided for a system of five series-connected converters showing a 10× reduction in the current ripple compared to normal operation.

Original languageAmerican English
Pages487-493
Number of pages7
DOIs
StatePublished - 14 Jun 2021
Event36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021 - Virtual, Online, United States
Duration: 14 Jun 202117 Jun 2021

Conference

Conference36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021
Country/TerritoryUnited States
CityVirtual, Online
Period14/06/2117/06/21

Bibliographical note

See NREL/CP-5D00-79582 for preprint

NREL Publication Number

  • NREL/CP-5D00-81216

Keywords

  • cascaded converter
  • decentralized control
  • differential power sharing
  • interleaving
  • ripple minimization

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