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Silicium-carbide-based isolated DC/DC converter for medium-voltage photovoltaic power plants

Abstract : The production of large-scale photovoltaics (PVs) is becoming increasingly popular in the field of power generation; they require the construction of power plants of several hundred megawatts. Nevertheless, the construction of these PV power plants with conventional low-voltage (LV) conversion systems is not an appropriate technological path. Particularly, large cross-section cables, a high quantity of semiconductors, and the bulky layout of 50/60-Hz step-up transformers make the PV system less competitive in terms of energy efficiency and cost. To overcome these drawbacks, this paper introduces new PV plant topologies with an intermediate medium-voltage direct current (MVDC) collector that requires galvanic isolation for connecting the PV arrays. Then, the design of a power electronic transformer (PET) is proposed, implementing 1.7-kV and 3.3-kV silicium carbide (SiC) power modules. The study confirms that this converter allows the use of medium-frequency (MF) transformers with high power densities while maintaining high efficiency, which facilitates the implementation of isolated medium-voltage (MV) topologies for utility-scale PV power plants.
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Submitted on : Tuesday, March 22, 2022 - 3:18:56 PM
Last modification on : Monday, July 4, 2022 - 9:45:18 AM
Long-term archiving on: : Thursday, June 23, 2022 - 7:32:36 PM

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Minh-Nhut Ngo, Philippe Ladoux, Jérémy Martin, Sébastien Sanchez. Silicium-carbide-based isolated DC/DC converter for medium-voltage photovoltaic power plants. Energies, MDPI, 2022, 15, pp.1038. ⟨10.3390/en15031038⟩. ⟨cea-03616454⟩

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