A Phase-Shifting MPPT Method to Mitigate Interharmonics from Cascaded H-Bridge PV Inverters

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Abstract

Interhamonics are an emerging issue in photo-voltaic (PV) systems. It has been revealed in the previous studies that the maximum power point tracking (MPPT) control is one of the responsibilities for interharmonic emissions. In cascaded H-bridge (CHB) PV inverters, if the MPPT perturbations of CHB cells are in-phase, the sum of the voltages of all CHB cells will oscillate with a higher amplitude, leading to large interharmonics in the grid. To address this, a phase-shifting MPPT method is proposed in this paper. By properly shifting the phase of the MPPT perturbation of each CHB cell, the oscillation of the equivalent total DC voltage can be effectively mitigated, and in turn, the interharmonics can be suppressed to a large extent. A 4-cell CHB PV inverter is examplified to demonstrate the proposed phase-shifting MPPT method, and n-cell CHB PV inverters have further been discussed regarding the implementation and control performances. The results have validated the effectiveness of the proposed method in terms of interharmonic suppression.
Original languageEnglish
Title of host publicationProceedings of 2020 IEEE Applied Power Electronics Conference and Exposition (APEC)
Number of pages7
PublisherIEEE Press
Publication statusAccepted/In press - 2020
Event2020 IEEE Applied Power Electronics Conference and Exposition (APEC) - New Orleans, LA, United States
Duration: 15 Mar 202019 Mar 2020

Conference

Conference2020 IEEE Applied Power Electronics Conference and Exposition (APEC)
CountryUnited States
CityNew Orleans, LA
Period15/03/202019/03/2020
SeriesIEEE Applied Power Electronics Conference and Exposition (APEC)
ISSN2470-6647

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Keywords

  • Interharmonics
  • cascaded H-bridge (CHB)
  • maximum power point tracking (MPPT)
  • photovoltaic (PV) systems

Cite this

Pan, Y., Sangwongwanich, A., Yang, Y., & Blaabjerg, F. (Accepted/In press). A Phase-Shifting MPPT Method to Mitigate Interharmonics from Cascaded H-Bridge PV Inverters. In Proceedings of 2020 IEEE Applied Power Electronics Conference and Exposition (APEC) IEEE Press. IEEE Applied Power Electronics Conference and Exposition (APEC)