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Title: Control and modulation of bidirectional single-phase AC-DC three-phase-leg SPWM converters with active power decoupling and minimal storage capacitance
Authors: Wu, H
Wong, SC 
Tse, CK 
Chen, Q
Issue Date: 2016
Source: IEEE transactions on power electronics, 2016, v. 31, no. 6, 7247724, p. 4226-4240
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. Active ac power balancing is often implemented to prevent the ac grid ripple power from injecting into the dc bus. A four-phase-leg sinusoidal pulsewidth-modulation (SPWM) converter can readily provide power factor correction and active ac power balancing. In this paper, the use of three-phase-leg SPWM converters for achieving these functions is analyzed. A family of bidirectional single-phase ac-dc three-phase-leg SPWM converters with an ac storage capacitor for use in a nanogrid system is designed with a general control structure and a modulation scheme for minimizing the ac storage capacitance. The general control structure is designed to achieve a decoupled system of a power-factor-correction converter cascaded with an active ac power load at the dc bus. The decoupled system is developed based on decomposition to differential-mode and common-mode voltages. The modulation method involves an extra zero-sequence voltage injection derived from the three-phase-leg SPWM voltages without introducing higher order harmonic distortions. A significant reduction of the ac storage capacitance and an improvement of converter efficiency are achieved. The design and analysis are verified by simulations and experimental measurements.
Keywords: AC storage capacitor
AC-DC bus converter
DC bus LED lighting
Single-phase inverter
Single-phase rectifier
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE transactions on power electronics 
ISSN: 0885-8993
EISSN: 1941-0107
DOI: 10.1109/TPEL.2015.2477504
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