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http://dx.doi.org/10.6113/TKPE.2017.22.2.95

A Simplified Voltage Balancing Method Applied to Multi-level H-bridge Converter for Solid State Transformer  

Jeong, Dong-Keun (Power Conversion and Control Research Center, HVDC Research Division, KERI)
Kim, Ho-Sung (Power Conversion and Control Research Center, HVDC Research Division, KERI)
Baek, Ju-Won (Power Conversion and Control Research Center, HVDC Research Division, KERI)
Cho, Jin-Tae (Smart Power Distribution Lab. Power Distribution ICT Group. KEPCO)
Kim, Hee-Je (Dept. of Electrical Eng., Pusan Nat'l University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.22, no.2, 2017 , pp. 95-101 More about this Journal
Abstract
A simple and practical voltage balance method for a solid-state transformer (SST) is proposed to reduce the voltage difference of cascaded H-bridge converters. The tolerance device components in SST cause the imbalance problem of DC-link voltage in the H-bridge converter. The Max/Min algorithms of voltage balance controller are merged in the controller of an AC/DC rectifier to reduce the voltage difference. The DC-link voltage through each H-bridge converter can be balanced with the proposed control methods. The design and performance of the proposed SST are verified by experimental results using a 30 kW prototype.
Keywords
SST(Solid State Transformer); Voltage balancing method; H-bridge converter; Multi-level converter;
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