Title

Closed-Loop Control of DC-DC Dual Active Bridge Converters Driving Single-Phase Inverters

Abstract

The solid state transformer (SST) is a high-frequency power electronic converter as a distribution power transformer. A common three-stage configuration of an SST consists of ac-dc rectifier, isolated dc-dc dual-active-bridge (DAB) converter, and dc-ac inverter. This work addresses the controller design issue for a dc-dc DAB converter when driving a regulated single-phase dc-ac inverter. Since the switching frequency of the inverter stage is much higher than that of the DAB stage, the single-phase inverter is modelled as a 120-Hz current sink. The effect of 120-Hz current by the single-phase inverter is studied. The limitation of PI-controller, low gain at 120 Hz, is investigated. Two methods are proposed to improve the regulation of the output voltage of DAB converters. The first one uses a bandstop filter and feedforward, while the second method uses an additional proportional-resonant controller in the feedback loop. Theoretical analysis, simulation and experiment results are provided.

Meeting Name

4th Annual IEEE Energy Conversion Congress and Exposition (2012: Sep. 15-20, Raleigh, NC)

Department(s)

Electrical and Computer Engineering

Keywords and Phrases

Closed-Loop Control; Dual Active Bridge Converter; Feed-Forward; Proportional-Resonant Controls; Single-Phase Inverters; Solid State Transformer (SST); Electric Rectifiers; Energy Conversion; Exhibitions; Power Transformers; DC-DC Converters; Feedforward; Proportional Resonant Control; Single Phase Inverter; Inverters; Feedforward Neural Networks; Gain; Capacitance; Harmonic Analysis; Voltage Control; Frequency Control; Rectifying Circuits; AC-DC Power Convertors; DC-AC Power Convertors; DC-DC Power Convertors; Invertors; Power Filters; Proportional Control

International Standard Book Number (ISBN)

9781467308038; 9781467308021

International Standard Serial Number (ISSN)

2329-3721; 2329-3748

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2012 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

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