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Ultracapacitor storage enabled global MPPT for photovoltaic central inverters

Muller, N.; Renaudineau, Hugues; Kouro, Samir; Wheeler, Patrick


N. Muller

Hugues Renaudineau

Samir Kouro


In most large scale grid-tied photovoltaic (PV) plants, central inverter configurations are used, mainly due to higher 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 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 the growth of renewable sources in electric markets has tightened grid codes; requiring for PV systems to limit power fluctuations to a certain maximum.
This paper presents an alternative to perform Global MPPT (GMPPT) while complying with new grid code limitations for electric markets with high penetration of renewables.
The proposed alternative consists on adding an Energy Storage System (ESS) at inverter level. The proposed system consists in an ultracapacitor (UC) bank connected to the DC-link of the central inverter through interleaved DC-DC power converters. The proposed configuration is validated through simulations and tested through extreme conditions. The performance of the system is analyzed and compared to other existing solutions.


Muller, N., Renaudineau, H., Kouro, S., & Wheeler, P. (2017). Ultracapacitor storage enabled global MPPT for photovoltaic central inverters. .

Conference Name 26th IEEE International Symposium on Industrial Electronics
End Date Jun 21, 2017
Acceptance Date Mar 13, 2017
Publication Date Aug 8, 2017
Deposit Date May 11, 2017
Publicly Available Date Aug 8, 2017
Electronic ISSN 2163-5145
Peer Reviewed Peer Reviewed
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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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