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Digital implementation of DS-SFH hybrid spread-spectrum modulation technique in three-phase voltage-source converter

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Abstract

Random Pulse Width modulation (RPWM) technique is being used presently for producing gate pulses for power electronic circuits such as rectifiers, inverters, and choppers. But in recent times, Direct-Sequence Slow-Frequency Hopping (DS-SFH) Hybrid Spread-Spectrum modulation technique has been employed in military communication systems since it combines the advantages of two different modulation techniques, namely Direct Spread Spectrum Modulation and Frequency Hopping Spread Spectrum Modulation. This hybrid technique is now proposed for the first time, for the suppression of EMI and improvement of power quality in three-phase grid-connected bidirectional Voltage Source Converters. This digital modulation technique is implemented through a compact low-cost SPARTAN Field Programmable Gate Array by developing a suitable VHDL coding for producing the required switching pulses for the converter. A comparative analysis is also presented between the proposed DS-SFH hybrid modulation and the RPWM. It is shown that the implementation of DS-SFH results in reduced EMI, decreased Total Harmonic Distortion, and power factor is also improved significantly.

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source voltage and source current waveforms obtained using a RPWM and b DS-SFHSS hybrid modulation technique during rectifier operation of the VSC

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source voltage and source current waveforms obtained using RPWM technique during inverter operation of the VSC

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source voltage and source current waveforms obtained using DS-SFH hybrid modulation technique during inverter operation of the VSC

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Acknowledgments

The authors would like to thank “SAMEER–The Center for Electro-Magnetics”, Chennai, Tamil Nadu, India for their laboratory support in taking Experimental EMI spectrums of three-phase VSC with various modulation techniques

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Authors and Affiliations

  1. Department of EEE, Rajalakshmi Engineering College, Chennai, Tamilnadu, 602105, India

    Rajalakshmi Alavanthan

  2. Department of EEE, College of Engineering, Guindy, Chennai, Tamilnadu, 600025, India

    A. Kavitha

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  1. Rajalakshmi Alavanthan
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Correspondence to Rajalakshmi Alavanthan.

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Alavanthan, R., Kavitha, A. Digital implementation of DS-SFH hybrid spread-spectrum modulation technique in three-phase voltage-source converter. Electr Eng 104, 1413–1423 (2022). https://doi.org/10.1007/s00202-021-01388-1

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