Operation and Control of a Hybrid Coupled Interlinking Converter for Hybrid AC/Low Voltage DC Microgrids

The respective advantages of ac and dc microgrids lead to the blooming development of the hybrid ac/dc microgrid, which consists of ac and dc microgrid tied by an interlinking converter. A new structure of hybrid coupled interlinking converter (HCIC), which composed of a converter in series with a s...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2021-08, Vol.68 (8), p.7104-7114
Main Authors: Wang, Lei, Fu, Xiaofan, Wong, Man-Chung
Format: Article
Language:English
Subjects:
Compensators
Control methods
Distributed generation
Droop control
Electric converters
Flow control
Harmonic analysis
Harmonic control
hybrid coupled interlinking converter
hybrid dc/dc microgrid
Hybrid power systems
Impedance
interlinking converter
Low voltage
Microgrids
power compensation
Power flow
Power harmonic filters
Reactive power
Static VAr compensators
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Summary:The respective advantages of ac and dc microgrids lead to the blooming development of the hybrid ac/dc microgrid, which consists of ac and dc microgrid tied by an interlinking converter. A new structure of hybrid coupled interlinking converter (HCIC), which composed of a converter in series with a static VAR compensator (SVC), is proposed for hybrid ac and low voltage dc (LVdc) microgrids. Moreover, a new droop control method is correspondingly developed for the proposed HCIC. Its fundamental active and reactive power flow in the hybrid ac/dc microgrid is controlled by P-δ and Q-P-V droop control for converter part of the HCIC, and P-Q-α droop control is proposed for SVC part of the HCIC. Furthermore, a fast harmonic control is given based on a decoupled control strategy to improve the filtering characteristics of SVC part of the HCIC, suppress the harmonic power, and/or inject active power. Finally, simulation and experimental results are provided to verify that the proposed HCIC for hybrid ac/LVdc microgrids has the ability of good power flow control and power quality compensation, which not only meets the power flow requirements with low rating system, but also greatly promotes the development of more robust hybrid ac/dc microgrids.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2020.3001802