Digital Implementation of Selective Harmonic Elimination Techniques in Modular Current Source Rectifiers

Digital Implementation of Selective Harmonic Elimination Techniques in Modular Current Source Rectifiers

Modular current source converters (MCSCs) have been proposed as an alternative method for increasing the power range of medium voltage PWM AC drives. MCSCs are built by stacking parallel current source converters. Two advantages that make MCSCs attractive are: (a) extended current/voltage ratings be...

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Bibliographic Details
Published in:IEEE transactions on industrial informatics Vol. 9; no. 2; pp. 1167 - 1177
Main Authors: Guzman, J. I., Melin, P. E., Espinoza, J. R., Moran, L. A., Baier, C. R., Munoz, J. A., Guinez, G. A.
Format: Journal Article
Language:English
Published: Piscataway IEEE 01-05-2013
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
AC drives
Alternating current
Current sources
digital control
Electric potential
Harmonic analysis
Harmonics
Indexes
Modular
Modulation
Power harmonic filters
Pulse duration modulation
PWM
Ratings
Rectifiers
selective harmonic elimination
Simulation
Studies
Topology
Vectors
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Summary:Modular current source converters (MCSCs) have been proposed as an alternative method for increasing the power range of medium voltage PWM AC drives. MCSCs are built by stacking parallel current source converters. Two advantages that make MCSCs attractive are: (a) extended current/voltage ratings beyond the device ratings and (b) simplicity in balancing the DC link current in each module. This can be accomplished using two optimized modulating patterns that have been proposed for such topologies: (a) multilevel selective harmonic elimination (MSHE) and (b) displaced selective harmonic elimination (DSHE). Both techniques are based on SHE patterns but there are slight differences in their digital implementation due to the way they generate the harmonic cancellation. Furthermore, when these techniques are used in the rectifier stage, it is reported that MSHE and DSHE do not eliminate all the unwanted harmonics due to practical issues such as changes in the modulating indexes to control the DC link currents. This work compares the operation of DSHE and MSHE when used in rectifiers of an MCSC in terms of execution time, robustness to poor sampling frequency, and quality of harmonic profiles on AC input currents under different operating conditions. Experimental results are presented to validate the theoretical considerations.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1551-3203
1941-0050
DOI:10.1109/TII.2012.2210232