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Paralleled DC–DC Converters Control Using Master–Slave Adaptive Fuzzy Backstepping Techniques

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Abstract

Balanced current sharing and output voltage control of paralleled DC–DC converter modules are essential requirements for enhanced reliability and power capacity. These control goals are challenging due to the load, supply voltage, line impedance uncertainties, inter-couplings of the converters, and open circuit faults. To achieve these goals, this paper proposes two novel adaptive fuzzy backstepping control methods for two sets of paralleled DC–DC converters. The proposed controllers are exercised in a master–slave architecture. First, a master–slave adaptive fuzzy backstepping controller is suggested for a set of paralleled buck converters to deal with matched and mismatched uncertainties, and to ensure balanced current sharing. To counteract uncertainties, as well as interactions among the converters, adaptive fuzzy estimators are employed. However, the suggested control strategy is not applicable to the paralleled boost converters due to their non-minimum-phase nature. Therefore, a novel master–slave adaptive fuzzy backstepping controller with a conventional proportional-integral reference current generator is proposed to encompass paralleled boost converters. Moreover, a simple fault-tolerant structure is suggested to detect the open circuit faults and re-share the inductor currents. The stability of the proposed controllers is guaranteed through the Lyapunov stability theorem. The proposed adaptive fuzzy backstepping control strategies offer good output voltage quality and current sharing, despite the uncertainties, inter-couplings, and open circuit faults. Comparative simulations are carried out on sets of three paralleled buck and boost converters to demonstrate the effectiveness and performance of the new control methods.

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Acknowledgements

The authors would like to express their sincere thanks to the deputy of research of the University of Bonab for financial and technical support.

Funding

The authors disclosed receipt of the following financial support for the research, authorship, and publication of this article: This work was supported by the University of Bonab (grant number 98/I/ER/935).

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Authors and Affiliations

  1. Department of Electrical Engineering, University of Bonab, Bonab, Iran

    Sajjad Shoja-Majidabad

  2. Department of Electrical Engineering, Ryerson University, Toronto, ON, M5B 2K3, Canada

    Amirnaser Yazdani

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  1. Sajjad Shoja-Majidabad
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Correspondence to Sajjad Shoja-Majidabad.

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Shoja-Majidabad, S., Yazdani, A. Paralleled DC–DC Converters Control Using Master–Slave Adaptive Fuzzy Backstepping Techniques. Iran J Sci Technol Trans Electr Eng 45, 1343–1367 (2021). https://doi.org/10.1007/s40998-021-00418-9

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