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DC-link Voltage Balancing Strategy based on SVM and Reactive Power Exchange for a 5L-MPC Back-to-Back Converter for Medium Voltage Drives.pdf (949.4Kb)
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Title
DC-link Voltage Balancing Strategy based on SVM and Reactive Power Exchange for a 5L-MPC Back-to-Back Converter for Medium Voltage Drives
Author
Mazuela, Mikel
Baraia-Etxaburu, Igor
Author (from another institution)
Atutxa Lekue, Iñigo
Torre, Iñigo
Echeverria, Ivan
Research Group
Sistemas electrónicos de potencia aplicados al control de la energía eléctrica
Other institutions
Ingeteam (Spain)
Version
Postprint
Rights
© 2016 IEEE
Access
Open access
URI
https://hdl.handle.net/20.500.11984/5610
Publisher’s version
http://doi.org/10.1109/TIE.2016.2580128
Published at
IEEE Transactions on Industrial Electronics  Vol. 63. N. 12. Pp. 7864-7875. June, 2016
xmlui.dri2xhtml.METS-1.0.item-publicationfirstpage
7864
xmlui.dri2xhtml.METS-1.0.item-publicationlastpage
7875
Publisher
IEEE
Keywords
Modulation
Switches
Capacitors
Reactive power ... [+]
Modulation
Switches
Capacitors
Reactive power
Support vector machines
Topology
Inverters [-]
Abstract
The reduced capability of multilevel converters with more than one intermediate node to balance the dc-link capacitors voltage, as well as the lack of standard modulation methods to improve their bala ... [+]
The reduced capability of multilevel converters with more than one intermediate node to balance the dc-link capacitors voltage, as well as the lack of standard modulation methods to improve their balancing performance, makes these converter topologies unattractive for real power applications. This is especially true when the load demands active power. One of these topologies is the five-level multipoint clamped (5L-MPC) converter. The back-to-back (B2B) configuration of two 5L-MPC converters and the use of a space vector modulation (SVM) that exploits the voltage balancing capability of the redundant switching vectors extend the operation conditions range in which a proper voltage balance can be achieved. However, if practical modulation restrictions are considered (limitation of voltage steps, dead times, switching losses, etc.), the voltage balance cannot be achieved for all operation conditions. In this paper, an SVM which takes into account practical restrictions is proposed. In order to guarantee the voltage balance at any operation condition, the grid-side rectifier exchanges reactive power with the grid-side LCL filter. Thus, the voltage balance of the dc-link is guaranteed while a unity grid-side power factor is achieved. The proposed modulation scheme and the voltage balancing strategy are experimentally validated in a 6.6 kV 1.5 MW 5L-MPC B2B converter. [-]
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