NDLI: Control of a cascaded H-bridge multilevel converter for grid connection of photovoltaic systems

Content Provider	IEEE Xplore Digital Library
Author	Kouro, S. Bin Wu Moya, A. Villanueva, E. Correa, P. Rodriguez, J.
Copyright Year	2009
Description	Author affiliation: Department of Electrical and Computer Engineering, Ryerson University, Toronto, Ontario, Canada (Kouro, S.; Bin Wu) \|\| Electronics Engineering Department, Universidad Técnica Federico Santa María, Valparaiso, Chile (Moya, A.; Villanueva, E.; Correa, P.; Rodriguez, J.)
Abstract	In this paper a control method for cascaded H-bridge multilevel converters for grid connection of photovoltaic systems is analyzed. The use of the multilevel converter introduces a series of advantages: improved power quality (lower current ripple), smaller filters, reduced switching frequency, no need of boost dc-dc stage and possible elimination of step-up transformer, all of which have a positive impact on the system efficiency. However it requires a more sophisticated control method specially due to dc-link voltage drifts produced by circulating power in the converter. The proposed control method is based on traditional voltage oriented control with a cascaded dc-link voltage control and grid current control loop. Two extra stages are added to this traditional control scheme, one to introduce maximum power point tracking for each module or string, and another to control the dc-link voltages drift due to circulating power in the converter. The latter is performed by the addition of a simple feedforward control strategy directly in the modulation stage. The proposed control method is modular and easy to adapt for any number of converters in series. Simulation results are presented to support the theoretical analysis.
Starting Page	3976
Ending Page	3982
File Size	1072590
Page Count	7
File Format	PDF
ISBN	9781424446483
ISSN	1553572X
e-ISBN	9781424446506
DOI	10.1109/IECON.2009.5415332
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-11-03
Publisher Place	Portugal
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Control systems Photovoltaic systems Voltage control DC-DC power converters Switching converters Power quality Filters Switching frequency Current control Analytical models
Content Type	Text
Resource Type	Article

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