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Ultracapacitor storage enabled global MPPT for photovoltaic central inverters

Muller, Nicolas; Renaudineau, Hugues; Kouro, Samir; Wheeler, Patrick

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Nicolas Muller

Hugues Renaudineau

Samir Kouro

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Professor of Power Electronic Systems


In most large-scale grid-tied photovoltaic (PV) plants, central inverter configurations are used, mainly due to higher converter efficiency and lower cost per kW. However, compared to other configurations, its Maximum Power Point Tracking (MPPT) efficiency is the lowest since it is the less distributed configuration. Under non-uniform conditions, as mismatch caused by aging and/or partial shading, several local maxima may arise in the PV curve, hence requiring additional actions to maximize the output power of the PV plant. Moreover, tighter grid codes have appeared, requiring for PV systems to limit power fluctuations. This paper presents an alternative to perform Global MPPT (GMPPT) while complying with stiffer grid code limitations. The proposed alternative adds an Energy Storage System (ESS) at inverter level, consisting of an ultracapacitor (UC) bank connected to the DC-link of a PV central inverter through interleaved DC-DC power converters. The proposed configuration is preliminary validated through simulations and tested under extreme conditions. The performance of the system is analyzed and compared to other existing solutions.

Conference Name IEEE 26th International Symposium on Industrial Electronics
Conference Location Edinburgh, UK
Start Date Jun 19, 2017
End Date Jun 21, 2017
Acceptance Date Mar 13, 2017
Online Publication Date Aug 7, 2017
Publication Date 2017
Deposit Date May 11, 2017
Publicly Available Date Aug 7, 2017
Electronic ISSN 2163-5145
Peer Reviewed Peer Reviewed
Pages 1046-1051
Series ISSN 2163-5145
Book Title 2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)
ISBN 978-1-5090-1413-2
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Additional Information ISSN 2163-5145 © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.


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