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Operating principles and practical design aspects of all SiC DC/AC/DC converter for MPPT in grid-connected PV supplies
Date
2018-12-01
Author
ÖZTÜRK, SERKAN
Popos, Polat
Utalay, Volkan
Koc, Atila
Ermiş, Muammer
ÇADIRCI, IŞIK
Metadata
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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A 20 kW, 20 kHz high frequency (HF) link maximum power point tracking (MPPT) converter for a grid-connected PV supply, based on all silicon carbide (SiC) power semiconductors, is presented. In the developed converter, SiC power MOSFETs are used in the low-voltage PV panel side and SiC Schottky diodes on the high-voltage DC output, in order to maximize the power conversion efficiency and the power density. Operating principles of the resulting dual H-bridge MPPT converter and the practical aspects of the converter design and its circuit layout, are described in detail. The implemented converter performance is compared with that of a classical Si-IGBT and hybrid-IGBT based MPPT converter in terms of efficiency. This configuration can compete with the non-isolated MPPT converter topologies, such as the boost converter commonly used in grid-connected PV systems, since it allows the possibility of using a conventional two-level, three-phase grid-connected inverter. This is due to the enhanced common-mode EMI performance as compared to non-isolated MPPT topologies, resulting in a competitive high efficiency PV converter design with galvanic isolation. It has been shown that the converter size can be shrinked up to a power density of 1.6 kW/lt, with a DC-DC converter full-load efficiency of 98%. The resulting compact and highly efficient SiC power MOSFET based HF link MPPT converter is suggested to be a part of grid-connected, multi-string PV supplies with simple inverter topologies in the future.
Subject Keywords
DC-DC converter
,
MPPT converter
,
HF link
,
SiC power MOSFET
,
SiC Schottky diode
,
PV supply
URI
https://hdl.handle.net/11511/29955
Journal
SOLAR ENERGY
DOI
https://doi.org/10.1016/j.solener.2018.10.049
Collections
Graduate School of Natural and Applied Sciences, Article
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S. ÖZTÜRK, P. Popos, V. Utalay, A. Koc, M. Ermiş, and I. ÇADIRCI, “Operating principles and practical design aspects of all SiC DC/AC/DC converter for MPPT in grid-connected PV supplies,”
SOLAR ENERGY
, pp. 380–394, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/29955.