Multi-mode Control for Three-phase Bidirectional AC/DC Converter in Hybrid Microgrid under Unbalanced AC voltage Conditions

Unbalanced AC voltage, AC current and DC ripple voltage are important issues for a hybrid AC/DC microgrid under unbalanced AC voltage conditions. In order to improve the utilization of power electronic converter and the power quality of the hybrid microgrid, a multi-mode control strategy for the bid...

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Bibliographic Details
Main Authors: Ren, Chunguang, Liu, Longfeng, Han, Xiaoqing, Zhang, Baifu, Wang, Lei, Wang, Peng
Format: Conference Proceeding
Language:English
Subjects:
AC-DC power converters
AC/DC converter
Control systems
hybrid microgrid
Hybrid power systems
Impedance
Microgrids
multi-mode control
Power quality
unbalanced conditions
Voltage control
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Summary:Unbalanced AC voltage, AC current and DC ripple voltage are important issues for a hybrid AC/DC microgrid under unbalanced AC voltage conditions. In order to improve the utilization of power electronic converter and the power quality of the hybrid microgrid, a multi-mode control strategy for the bidirectional AC/DC converter is proposed in this paper. The operation of the converter is divided into four modes: normal operation, balanced current, unbalanced voltage compensation and ripple free DC voltage. The principle of each mode has been analyzed in detail. The proposed strategy is implemented by introducing a multi-mode parameter to control the negative-sequence impedance of the converter. Compensation characteristics on AC voltage and AC current have been analyzed by the bode diagram. The effectiveness of the proposed control strategy is verified by experiment results.
ISSN:2329-3748
DOI:10.1109/ECCE.2019.8912259