Single-Stage Voltage Balancer With High-Frequency Isolation for Bipolar LVDC Distribution System

Conventional voltage balancers for the bipolar low-voltage dc (LVdc) distribution system have been composed of multiple power stages, which degrade their power density and cost effectiveness. To minimize the power stages, this paper presents a single-stage voltage balancer with high-frequency isolat...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2020-05, Vol.67 (5), p.3596-3606
Main Authors: Lee, Jun-Young, Cho, Young-Pyo, Jung, Jee-Hoon
Format: Article
Language:English
Subjects:
Bipolar dc distribution system
Cost effectiveness
DC-DC power converters
Electric converters
Electric potential
Modulation
phase-shift control
Power generation
Proportional integral
Stress
Switches
Switching
three-level dual-active-bridge
Voltage
voltage balancer
Voltage control
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Summary:Conventional voltage balancers for the bipolar low-voltage dc (LVdc) distribution system have been composed of multiple power stages, which degrade their power density and cost effectiveness. To minimize the power stages, this paper presents a single-stage voltage balancer with high-frequency isolation. This voltage balancer is based on the three-level dual-active-bridge converter. Furthermore, for the proposed voltage balancer, an enhanced switching modulation, using the two switching patterns α and β, is proposed to fully balance the bipolar voltage level under unbalanced load condition and even for when one of the dc poles has no load. Besides, a closed-loop control system can be implemented by using output voltage information and proportional-integral controllers. Finally, experimental results using a 3-kW laboratory prototype converter verify the effectiveness of the proposed voltage balancer.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2019.2918498