NDLI: Operation of the full-bridge three-level DC–DC converter in unbalanced bipolar DC microgrids

Content Provider	IET Digital Library
Author	Broeck, Giel Van den Beerten, Jef Vecchia, Mauricio Dalla Ravyts, Simon Driesen, Johan
Abstract	As compared to two-wire, unipolar DC microgrids (DCμGs), bipolar DCμGs apply a positive, neutral and negative conductor to increase the power transfer capability while retaining two voltage levels for supplying low- and high-power devices at an appropriate voltage. However, connecting devices between the positive or negative pole and the neutral conductor will result in unbalanced currents causing voltage to unbalance. Therefore, power electronic converters with voltage balancing capability are essential. Instead of installing dedicated voltage balancing converters, this study proposes to apply three-level DC–DC converters. These converters can interface battery storage with bipolar DCμGs and balance the pole-to-neutral voltages at the same time. However, high levels of unbalanced currents drive three-level DC–DC converters towards their theoretical unbalanced operating limits. To derive these, a method is presented which decomposes the governing equations in balanced and unbalanced components. Although the method is generally applicable to the three-level converters, the full-bridge three-level converter serves as a comprehensive example. The method enables to derive the unbalanced operating area of three-level DC–DC converters and to appropriately size the filter inductor. Furthermore, a novel modulation strategy is introduced in order to lower the inductor current ripple in unbalanced conditions, supported by experimental results.
Starting Page	2256
Ending Page	2265
Page Count	10
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 9, Aug (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.5793
Journal	IET Power Electronics
Publisher Date	2019-05-10
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Control of Electric Power System DC-DC Power Converter Distributed Power Generation Full-bridge Three-level Converter Full-bridge Three-level DC–DC Converter Inductor Negative Conductor Neutral Conductor Pole-to-neutral Voltage Positive Conductor Power Converter Power Electronic Converter Power Electronics Power Supplies to Apparatus Power Supply Supervisory Circuit Switching Converter Three-level Converter Three-level DC–DC Converters Unbalanced Bipolar DC Microgrid Unbalanced Current Voltage Balancing Capability Voltage Balancing Converter Voltage Control Voltage Level
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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