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Energies 2017, 10(5), 706; doi:10.3390/en10050706

Performance Analysis of a Four-Switch Three-Phase Grid-Side Converter with Modulation Simplification in a Doubly-Fed Induction Generator-Based Wind Turbine (DFIG-WT) with Different External Disturbances

1,2
,
1,2
,
3,* and 4
1
The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
2
Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, UK
3
School of Electric Power Engineering, South China University of Technology, Guangzhou 510640, China
4
Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, TN 37996, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Grandi
Received: 9 March 2017 / Revised: 12 May 2017 / Accepted: 14 May 2017 / Published: 18 May 2017
(This article belongs to the Section Electrical Power and Energy System)
View Full-Text   |   Download PDF [17018 KB, uploaded 24 May 2017]   |  

Abstract

This paper investigates the performance of a fault-tolerant four-switch three-phase (FSTP) grid-side converter (GSC) in a doubly-fed induction generator-based wind turbine (DFIG-WT). The space vector pulse width modulation (SVPWM) technique is simplified and unified duty ratios are used for controlling the FSTP GSC. Steady DC-bus voltage, sinusoidal three-phase grid currents and unity power factor are obtained. In addition, the balance of capacitor voltages is accomplished based on the analysis of current flows at the midpoint of DC bus in different operational modes. Besides, external disturbances such as fluctuating wind speed and grid voltage sag are considered to test its fault-tolerant ability. Furthermore, the effects of fluctuating wind speed on the performance of DFIG-WT system are explained according to an approximate expression of the turbine torque. The performance of the proposed FSTP GSC is simulated in Matlab/Simulink 2016a based on a detailed 1.5 MW DFIG-WT Simulink model. Experiments are carried out on a 2 kW platform by using a discrete signal processor (DSP) TMS320F28335 controller to validate the reliability of DFIG-WT for the cases with step change of the stator active power and grid voltage sag, respectively. View Full-Text
Keywords: doubly-fed induction generator (DFIG); four-switch three-phase (FSTP); grid-side converter (GSC); simplified space vector pulse width modulation (SVPWM); external disturbance; fault-tolerant ability doubly-fed induction generator (DFIG); four-switch three-phase (FSTP); grid-side converter (GSC); simplified space vector pulse width modulation (SVPWM); external disturbance; fault-tolerant ability
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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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Ni, K.; Hu, Y.; Liu, Y.; Gan, C. Performance Analysis of a Four-Switch Three-Phase Grid-Side Converter with Modulation Simplification in a Doubly-Fed Induction Generator-Based Wind Turbine (DFIG-WT) with Different External Disturbances. Energies 2017, 10, 706.

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