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Electronics 2015, 4(2), 339-358; doi:10.3390/electronics4020339

Use of Three-Level Power Converters in Wind-Driven Permanent-Magnet Synchronous Generators with Unbalanced Loads

Department of Electrical Engineering, Ming Chi University of Technology, 84 Gungjuan Road, Taishan District, New Taipei City 24301, Taiwan
Academic Editor: Bimal K. Bose
Received: 25 April 2015 / Accepted: 9 June 2015 / Published: 15 June 2015
(This article belongs to the Special Issue Multi-Level Converters)
View Full-Text   |   Download PDF [3070 KB, uploaded 15 June 2015]   |  

Abstract

This paper describes the design and implementation of three-level power converters for wind-driven permanent-magnet synchronous generators with unbalanced loads. To increase voltage stress and reduce current harmonics in the electrical power generated by a wind generator, a three-phase, three-level rectifier is used. Because a synchronous rotating frame is used on the AC-input side, the use of a neutral-point-clamped controller is proposed to increase the power factor to unity and reduce current harmonics. Furthermore, a novel six-leg inverter is proposed for transferring energy from the DC voltage to a three-phase, four-wire AC source with a constant voltage and a constant frequency. The power converters also contain output transformers and filters for power buffering and filtering, respectively. All three output phase voltages are fed back to control the inverter output during load variations. A digital signal processor is used as the core control device for implementing a 1.5 kV, 75 kW drive system. Experimental data show that the power factor is successfully increased to unity and the total current harmonic distortion is 3.2% on the AC-input side. The entire system can attain an efficiency of 91%, and the voltage error between the upper and lower capacitors is approximately zero. Experimental results that confirm the high performance of the proposed system are presented. View Full-Text
Keywords: three-level power converter; permanent-magnet synchronous generator; neutral-point clamped; six-leg inverter; digital signal processor three-level power converter; permanent-magnet synchronous generator; neutral-point clamped; six-leg inverter; digital signal processor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chen, M.-H. Use of Three-Level Power Converters in Wind-Driven Permanent-Magnet Synchronous Generators with Unbalanced Loads. Electronics 2015, 4, 339-358.

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