Highly Efficient AC-DC Converter for Small Wind Power Generators

Hyung-Min Ryu

Highly Efficient AC-DC Converter for Small Wind Power Generators

Hyung-Min Ryu

Vol. 11, No. 2, pp. 188-193, Mar. 2011

10.6113/JPE.2011.11.2.188

Energy saving

High efficiency

Small wind power generator

Super Junction FET

Three-phase bridgeless converter

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Abstract

A highly efficient AC-DC converter for small wind power generation systems using a brushless DC generator (BLDCG) is presented in this paper. The market standard AC-DC converter for a BLDCG consists of a three-phase diode rectifier and a boost DC-DC converter, which has an IGBT and a fast recovery diode (FRD). This kind of two-stage solution basically suffers from a large amount of conduction loss and the efficiency greatly decreases under a light load, or at a low current, because of the switching devices with a P-N junction. In order to overcome this low efficiency, especially at a low current, a three-phase bridgeless converter consisting of three upper side FRDs and three lower side Super Junction FETs is presented. In the overall operating speed region, including the cut-in speed, the efficiency of the proposed converter is improved by up to 99%. Such a remarkable result is validated and compared with conventional solutions by calculating the power loss based on I-V curves and the switching loss data of the adopted commercial switches and the current waveforms obtained through PSIM simulations.

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Cite this article

[IEEE Style]

H. Ryu, "Highly Efficient AC-DC Converter for Small Wind Power Generators," Journal of Power Electronics, vol. 11, no. 2, pp. 188-193, 2011. DOI: 10.6113/JPE.2011.11.2.188.

[ACM Style]

Hyung-Min Ryu. 2011. Highly Efficient AC-DC Converter for Small Wind Power Generators. Journal of Power Electronics, 11, 2, (2011), 188-193. DOI: 10.6113/JPE.2011.11.2.188.