A Fixed-Frequency Soft-Switched Interleaved 3-Phase AC-to-DC Converter

Abstract

This paper proposes a three-phase interleaved high frequency transformer isolated ac-dc converter that is suitable for small scale wind energy conversion systems employing permanent magnet synchronous generators. This configuration is realized by interleaving three identical single-phase single stage ac-dc converters obtained by integrating a rectifier, boost converter and fixed-frequency dual-tank LCL resonant converters. Based on a design example used for illustration purpose, a converter is designed and PSIM simulation results are presented for various operating conditions, such as balanced and unbalanced 3-phase operation; two-phase operation. It is shown that the converter maintains soft switching fore wide variation in supply voltage with low THD with high power factor.