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Undersampling Control for a DC–DC Boost and Forward Dual Active Bridge for a Single-Phase Grid-Connected PV Converter

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Abstract

Digital control methods and digital controllers are widely adopted in power electronics applications due to technical and economic advantages against its analog counterparts. Switched-mode power converters with switching frequencies of hundreds of kilohertz to megahertz impose a challenge such as less sampling time in which control algorithm calculations must be realized in digital implementations. Software-based controllers are designed and implemented in code lines executed in general-purpose DSP, being the most preferred digital implementation. Although high-frequency applications with more complex algorithm calculations restrict the maximum allowable sampling frequency, that can be even below the converter switching frequency. The study, analysis and design in such special condition is a main contribution of the paper. Without loss of generality, a software-based digital design under processing speed limitation is developed for two DC–DC power converters that compose a single-phase grid-connected PV converter: (1) a boost converter and (2) a unidirectional power flow DAB topology.

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Acknowledgements

The authors would like to thank Typhoon HIL for the support and the Brazilian federal governments agencies CAPES and CNPq, and the Minas Gerais state government agency FAPEMIG

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Authors and Affiliations

  1. Graduate Program in Electrical Engineering, Universidade Federal de Minas Gerais, Av. Antnio Carlos 6627, Belo Horizonte, MG, 31270-901, Brazil

    Alysson A. P. Machado

  2. Department of Electronic Engineering, Universidade Federal de Minas Gerais, Av. Antnio Carlos 6627, Belo Horizonte, MG, 31270-901, Brazil

    Igor A. Pires

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Correspondence to Alysson A. P. Machado.

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Machado, A.A.P., Pires, I.A. Undersampling Control for a DC–DC Boost and Forward Dual Active Bridge for a Single-Phase Grid-Connected PV Converter. J Control Autom Electr Syst 29, 650–659 (2018). https://doi.org/10.1007/s40313-018-0404-9

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