Control and Modulation of Bidirectional Single-Phase AC-DC Three-Phase-Leg SPWM Converters with Active Power Decoupling and Minimal Storage Capacitance

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Article number7247724
Pages (from-to)4226-4240
Journal / PublicationIEEE Transactions on Power Electronics
Volume31
Issue number6
Online published9 Sep 2015
Publication statusPublished - Jun 2016
Externally publishedYes

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.

Research Area(s)

  • AC storage capacitor, AC-DC bus converter, DC bus LED lighting, single-phase inverter, single-phase rectifier

Citation Format(s)

Control and Modulation of Bidirectional Single-Phase AC-DC Three-Phase-Leg SPWM Converters with Active Power Decoupling and Minimal Storage Capacitance. / Wu, Hao; Wong, Siu-Chung; Tse, Chi K. et al.

In: IEEE Transactions on Power Electronics, Vol. 31, No. 6, 7247724, 06.2016, p. 4226-4240.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review