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Article

LLC Resonant Voltage Multiplier-Based Differential Power Processing Converter Using Voltage Divider with Reduced Voltage Stress for Series-Connected Photovoltaic Panels under Partial Shading

1
College of Engineering, Ibaraki University, Hitachi 316-8511, Japan
2
Nippon Steel, Tokyo 100-8071, Japan
3
Toyota Motor Corporation, Toyota City 471-8571, Japan
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(10), 1193; https://doi.org/10.3390/electronics8101193
Received: 26 September 2019 / Revised: 16 October 2019 / Accepted: 18 October 2019 / Published: 20 October 2019
(This article belongs to the Special Issue Emerging Technologies for Photovoltaic Solar Energy)
Partial shading on photovoltaic (PV) strings consisting of multiple panels connected in series is known to trigger severe issues, such as reduced energy yield and the occurrence of multiple power point maxima. Various kinds of differential power processing (DPP) converters have been proposed and developed to prevent partial shading issues. Voltage stresses of switches and capacitors in conventional DPP converters, however, are prone to soar with the number of panels connected in series, likely resulting in impaired converter performance and increased circuit volume. This paper proposes a DPP converter using an LLC resonant voltage multiplier (VM) with a voltage divider (VD) to reduce voltage stresses of switches and capacitors. The VD can be arbitrarily extended by adding switches and capacitors, and the voltage stresses can be further reduced by extending the VD. Experimental verification tests for four PV panels connected in series were performed emulating partial shading conditions in a laboratory and outdoor. The results demonstrated the proposed DPP converter successfully precluded the negative impacts of partial shading with mitigating the voltage stress issues. View Full-Text
Keywords: photovoltaic system; voltage divider; partial shading; differential power processing converter; LLC converter; voltage multiplier photovoltaic system; voltage divider; partial shading; differential power processing converter; LLC converter; voltage multiplier
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MDPI and ACS Style

Uno, M.; Nakane, T.; Shinohara, T. LLC Resonant Voltage Multiplier-Based Differential Power Processing Converter Using Voltage Divider with Reduced Voltage Stress for Series-Connected Photovoltaic Panels under Partial Shading. Electronics 2019, 8, 1193. https://doi.org/10.3390/electronics8101193

AMA Style

Uno M, Nakane T, Shinohara T. LLC Resonant Voltage Multiplier-Based Differential Power Processing Converter Using Voltage Divider with Reduced Voltage Stress for Series-Connected Photovoltaic Panels under Partial Shading. Electronics. 2019; 8(10):1193. https://doi.org/10.3390/electronics8101193

Chicago/Turabian Style

Uno, Masatoshi, Toru Nakane, and Toshiki Shinohara. 2019. "LLC Resonant Voltage Multiplier-Based Differential Power Processing Converter Using Voltage Divider with Reduced Voltage Stress for Series-Connected Photovoltaic Panels under Partial Shading" Electronics 8, no. 10: 1193. https://doi.org/10.3390/electronics8101193

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