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

Kai Ni, Yihua Hu, Yang Liu and Chun Gan
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Kai Ni: The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
Yihua Hu: The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
Yang Liu: School of Electric Power Engineering, South China University of Technology, Guangzhou 510640, China
Chun Gan: Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, TN 37996, USA

Energies, 2017, vol. 10, issue 5, 1-24

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.

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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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