Extended-Phase-Shift Control of Isolated Bidirectional DC-DC Converter for Power Distribution in Microgrid

This paper points out a phenomenon of power backflow in traditional phase-shift (TPS) control of isolated bidirectional full-bridge DC-DC converter (IBDC), and analyzes the effects which backflow power act on power circulating flow and current stress. On this basis, the paper proposes a novel extend...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2012-11, Vol.27 (11), p.4667-4680
Main Authors: Zhao, Biao, Yu, Qingguang, Sun, Weixin
Format: Article
Language:English
Subjects:
Bidirectional
Bidirectional DC/DC converter
Computational efficiency
Control systems
Converters
current stress
Electric currents
Electric power
Electrical equipment
Electricity distribution
EPS
Equivalent circuits
Flexibility
Inductors
Load flow
Mathematical models
microgrid
phase-shift control
Power distribution
power flow
Stress
Stresses
Switches
Voltage control
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Summary:This paper points out a phenomenon of power backflow in traditional phase-shift (TPS) control of isolated bidirectional full-bridge DC-DC converter (IBDC), and analyzes the effects which backflow power act on power circulating flow and current stress. On this basis, the paper proposes a novel extended-phase-shift (EPS) control of IBDC for power distribution in microgrid. Compared with TPS control, EPS control not only expands regulating range of transmission power and enhances regulating flexibility, but also reduces current stress and improves the system efficiency. The operation principle of EPS control and the operation modes of IBDC are analyzed in the paper. By establishing mathematical models of transmission power, backflow power, and current stress, the paper comparatively analyzes control performances of TPS and EPS control. At last, experimental results verify the excellent performance of EPS control and correctness of the theoretical analysis.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2011.2180928