Distributed secondary and tertiary controls for I–V droop-controlled-paralleled DC–DC converters

A hierarchical distributed control method for I–V droop-controlled-paralleled DC–DC converters in DC microgrid is proposed. The control structure includes primary, secondary, and tertiary levels. The secondary control level is used to remove the DC voltage deviation and improve the current sharing a...

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Bibliographic Details
Published in:IET generation, transmission & distribution transmission & distribution, 2018-04, Vol.12 (7), p.1538-1546
Main Authors: Wang, Haojie, Han, Minxiao, Guerrero, Josep M, Vasquez, Juan C, Teshager, Bitew G
Format: Article
Language:English
Subjects:
average restoration value
batteries
bus voltage average values calculation
current sharing accuracy improvement
DC microgrid
DC voltage deviation remove
DC‐DC power convertors
distributed control
distributed power generation
distributed secondary control
distributed tertiary control
dynamic consensus algorithm
hierarchical distributed control method
hierarchical systems
I–V droop‐controlled‐paralleled DC–DC converter
power 0.7 kW
power generation control
power system restoration
Research Article
secondary cells
secondary control level
SoC management
state of charge management
system conversion efficiency
tertiary control level
voltage restoration
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Summary:A hierarchical distributed control method for I–V droop-controlled-paralleled DC–DC converters in DC microgrid is proposed. The control structure includes primary, secondary, and tertiary levels. The secondary control level is used to remove the DC voltage deviation and improve the current sharing accuracy. An improved dynamic consensus algorithm is used in the secondary control to calculate the average values of bus voltage and voltage restoration in distributed control. In the tertiary control level, as the main contribution in this study, the system conversion efficiency is enhanced by using the average restoration value obtained in the secondary control level, instead of using the total load current which needs more communication traffic. When the converters are connected to batteries, the method for the state of charge (SoC) management is proposed so that the SoC balance can be guaranteed. The effectiveness of the proposed method is verified by detailed experimental tests based on four 0.7 kW DC–DC converters.
ISSN:1751-8687
1751-8695
1751-8695
DOI:10.1049/iet-gtd.2017.0948