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Energies 2018, 11(2), 379; https://doi.org/10.3390/en11020379

On Reducing the Shaft Torque Ripple of Small-to-Medium-Scale Wind Energy Conversion Systems Using Multi-Pulse Autotransformer Rectifier

1
College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
2
College of Automation, Chongqing University, Chongqing 400044, China
*
Author to whom correspondence should be addressed.
Received: 17 January 2018 / Revised: 1 February 2018 / Accepted: 2 February 2018 / Published: 6 February 2018
(This article belongs to the Section Sustainable Energy)
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Abstract

In a small-to-medium-scale wind energy conversion system (WECS), diode rectifiers rather than pulse-width modulated (PWM) rectifiers are widely adopted due to the features of high reliability and low cost. However, large current harmonics are induced in the generator phase current by commutations of diode rectifier, eventually causing large torque ripple on the drive-train of the WECS and making it more likely to be fatigue breakdown. In this paper, a 12-pulse autotransformer rectifier unit (ATRU) with reduced volume and weight is proposed for WECS application. By analyzing the characteristics of the input current and output voltage of the ATRU within the entire operation range of WECS, the method to properly design its parameters is proposed. A 1.2 kW direct-drive WECS demonstration platform using ATRU is built in the lab. A modified sensorless overall power control strategy is adopted to control the WECS. Experimental tests are carried out and the results not only validate the feasibility of implementing ATRU in WECS applications, but also prove its high torque ripple reduction ability. View Full-Text
Keywords: wind power generation; dynamic load attenuation; autotransformer rectifier; system design; power control wind power generation; dynamic load attenuation; autotransformer rectifier; system design; power control
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Chen, J.; Chen, J. On Reducing the Shaft Torque Ripple of Small-to-Medium-Scale Wind Energy Conversion Systems Using Multi-Pulse Autotransformer Rectifier. Energies 2018, 11, 379.

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