To Resolve The Voltage Unbalance Of The Dc Links In Different H-Bridges Based Solid State Transformer (Sst)
Journal Title: International Journal of Research in Computer and Communication Technology - Year 2015, Vol 4, Issue 1
Abstract
As the expansion of the dc distribution system and the augment of the penetration of distributed generations an intelligent transformer with the capability to actively supervise the power and allowing for the easy connection of the distribution resources is becoming essential. The solid state transformer (SST) has the features of immediate voltage regulation, voltage sag compensation, fault isolation, power factor correction, harmonic isolation and dc output. Acting very much like an energy router, each SST has bidirectional energy flow control potential allowing it to control active and reactive power flow and to handle the fault currents on both low- and high-voltage sides. Its large control bandwidth offers the plug-and-play feature for distributed resources to speedily recognize and respond to changes in the system. This paper proposes a 20-kVA cascaded H-Bridge multilevel converter-based SST to directly interface with 7.2-kV single-phase distribution voltage level. The SST consists of a cascaded multilevel ac/dc rectifier, dual active bridge (DAB) converters with high-frequency transformers. The DAB converter regulates the 400-V-low-voltage dc bus and added dc/ac inverters can be added to present a 60 Hz 120/240-V ac residential voltage.
Authors and Affiliations
Peravali Jyotsna,P. Suguna Ratna Mala
Keywords
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