TY - GEN
T1 - Control and Modulation of a Family of Bidirectional AC-DC Converters with Active Power Compensation
AU - Wu, Hao
AU - Wong, Siu-Chung
AU - Tse, C. K.
AU - Chen, Qianhong
PY - 2015/9
Y1 - 2015/9
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84963602635&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84963602635&origin=recordpage
UR - https://app-overton-io.ezproxy.cityu.edu.hk/articles.php?query=10.1109/ECCE.2015.7309752
U2 - 10.1109/ECCE.2015.7309752
DO - 10.1109/ECCE.2015.7309752
M3 - RGC 32 - Refereed conference paper (with host publication)
T3 - 2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015
SP - 661
EP - 668
BT - 2015 IEEE Energy Conversion Congress and Exposition (ECCE)
PB - IEEE
T2 - 7th Annual IEEE Energy Conversion Congress and Exposition (ECCE 2015)
Y2 - 20 September 2015 through 24 September 2015
ER -