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Unity power factor rectifier-inverter structure operating under unbalanced supply and variable dc bus voltage

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2 Author(s)
Maswood, A.I. ; Center for Adv. Power Electron. (CAPE), Nanyang Technol. Univ., Singapore, Singapore ; Liu, F.

A recently introduced method of improving converter input current waveforms as well as power factor are re-evaluated under non-ideal operating conditions, that is, variable DC bus and unbalanced supply. The proposed method makes use of a novel controlled front-end diode rectifier of a rectifier-inverter structure. The technique involves the use of bi-directional bi-pass switches across the front-end rectifier, with a dSPACE-based intelligent control algorithm. The operation of the converter is fully analysed as possible DC/AC drives and a complete design example is provided. The main feature of the topology is low cost, small size, high power factor and simplicity. It is found to be a universal retrofit for DC drives, and in the front-end rectifier of existing three-phase AC drives, UPS etc. for power factor correction without any passive or active filtering.

Published in:

Power Electronics, IET  (Volume:4 ,  Issue: 8 )

Date of Publication:

September 2011

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