Harmonics Mitigation in Cascaded Multilevel PV Inverters During Power Imbalance Between Cells

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Abstract

This paper presents a grid connected multilevel topology for photovoltaic (PV) systems. Usually, multilevel converters for PV application suffer from a distorted output current and voltage when the submodules are not subjected to an even solar irradiance. The difference in submodules irradiance results in different submodules duty cycles when maintaining the maximum power point tracking (MPPT). The distortion of the output current is proportional with the difference of the cells duty cycles. To this regard, a multilevel topology for PV applications is proposed along with a control and modulation strategy. In this proposed topology, H6 bridge-based cell is used instead of an H-bridge one. In case of solar irradiance mismatch, the proposed converter injects power with less voltage from the shaded cells without altering the PV voltage, and hence, the MPPT. This modification allows retaining a tantamount duty cycle in all cells whatever the meteorological conditions are present. To test the effectiveness of the proposed idea, a detailed simulation model was set up. The results show that the proposed concept provides a significantly improved output current quality compared to the cascaded H-bridge topology.
Original languageEnglish
Title of host publicationProceedings - 2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe, EEEIC/I and CPS Europe 2019
Number of pages6
PublisherIEEE Press
Publication dateJun 2019
Article number8783901
ISBN (Electronic)9781728106526
DOIs
Publication statusPublished - Jun 2019
Event2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) - NH Collection Genoa Marina Hotel, Genoa, Italy
Duration: 11 Jun 201914 Jun 2019
Conference number: 19
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Conference

Conference2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
Number19
LocationNH Collection Genoa Marina Hotel
CountryItaly
CityGenoa
Period11/06/201914/06/2019
Internet address

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Keywords

  • Cascaded converter
  • Grid connected
  • H-bridge
  • MMC
  • MPPT
  • PO
  • Partial shading
  • Photovoltaic
  • Power quality

Cite this

Lashab, A., Séra, D., & Guerrero, J. M. (2019). Harmonics Mitigation in Cascaded Multilevel PV Inverters During Power Imbalance Between Cells. In Proceedings - 2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe, EEEIC/I and CPS Europe 2019 [8783901] IEEE Press. https://doi.org/10.1109/EEEIC.2019.8783901