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Title: Control and modulation of a family of bidirectional AC-DC converters with active power compensation
Authors: Wu, H
Wong, SC 
Tse, CK 
Chen, Q
Keywords: Capacitors
Integrated circuits
Harmonic analysis
Legged locomotion
Issue Date: 2015
Publisher: Institute of Electrical and Electronics Engineers
Source: 2015 IEEE Energy Conversion Congress and Exposition (ECCE), Montreal, QC, Canada, 20-24 Sept 2015, p.661-668 How to cite?
Abstract: In a single-phase grid-connected nanogrid system, a bidirectional AC-DC converter is usually required to transfer energy between the AC grid and a DC bus. However, a ripple power at twice the grid frequency may be injected from the AC grid into the DC bus if the ripple power is not properly compensated. In this paper, a family of bidirectional single-phase AC-DC three-phase-leg PWM converters for use in the nanogrid system is analyzed. The averaged DC power and the second-order AC power of the AC grid are actively decoupled. A proper AC voltage reference for AC power compensation is analyzed and selected for the charge storage capacitor for better efficiency. A generalized control structure is proposed for the family of converters. Applying modulation with extra zero-sequence voltage injection derived from the three-phase-leg PWM voltages, a significant reduction of the AC storage capacitance is achieved and the converter efficiency is also improved. Finally, the analysis is verified by simulations and experimental measurements.
ISBN: 978-1-4673-7151-3 (electronic)
978-1-4673-7150-6 (USB)
ISSN: 2329-3721
EISSN: 2329-3748
DOI: 10.1109/ECCE.2015.7309752
Appears in Collections:Conference Paper

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