Performance Evaluation of a Multicell Topology Implemented With Single-Phase Nonregenerative Cells Under Unbalanced Supply Voltages
Baier, C.R.
Guzman, J.I.
Espinoza, J.R.
Perez, M.A.
Rodriguez, J.R.
Univ. de Concepcion, Concepcion;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Dec. 2007
Volume: 54,
Issue: 6
On page(s): 2969-2978
ISSN: 0278-0046
INSPEC Accession Number: 9692642
Digital Object Identifier: 10.1109/TIE.2007.903977
Current Version Published: 2007-10-29
Abstract
The analysis of a multicell topology that is implemented with single-phase nonregenerative cells under an unbalanced ac mains is presented. The study shows that the topology naturally compensates most of the voltage unbalance; for instance, for a 100% voltage unbalance in the ac mains, just 32% reaches the load. For critical applications, a feedforward control technique is proposed in order to compensate the remaining unbalance at the load side. The resulting topology, in combination with the proposed strategy, reduces near to zero the load fundamental voltage unbalance, while the input current unbalance and distortion are also improved. A theoretical analysis that is based on symmetrical components and the experimental results confirm the theoretical considerations.
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