Cascaded U-Cell multilevel converter for STATCOM applications

Cascaded H-bridge (CHB) converter is one of the popular solution for medium voltage transformerless static synchronous compensator (STATCOM) applications. The semiconductor devices of this converter are switched at low frequency. Therefore, conduction losses contribute to major part of the losses in...

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Bibliographic Details
Published in2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe) pp. 1 - 9
Main Authors Sau, Shambhu, Fernandes, B. G.
Format Conference Proceeding
LanguageEnglish
Published Jointly owned by EPE Association and IEEE PELS 01.09.2015
Subjects
Automatic voltage control
Capacitance
Capacitors
Modulation
Multilevel converters
Reactive power
Static Synchronous Compensator (STATCOM)
Static Var Compensator (SVC)
Switches
Voltage Source Converter (VSC)
Voltage Source Inverters (VSI)
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Summary:Cascaded H-bridge (CHB) converter is one of the popular solution for medium voltage transformerless static synchronous compensator (STATCOM) applications. The semiconductor devices of this converter are switched at low frequency. Therefore, conduction losses contribute to major part of the losses in this converter. To reduce the conduction losses, a cascaded U-cell (CUC) multilevel converter is derived from CHB converter. The proposed converter has less number of switches compared to CHB converter and therefore reduces the overall losses of the converter. Converter circuit topology, control strategy and simulation results for static var compensation are presented. The losses are estimated and compared with that of CHB converter to verify the reduction of overall losses in proposed converter.
DOI:10.1109/EPE.2015.7309278