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Energies 2017, 10(12), 2087; doi:10.3390/en10122087

Harmonic Analyzing of the Double PWM Converter in DFIG Based on Mathematical Model

1,2,* and 1,2
Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Author to whom correspondence should be addressed.
Received: 20 October 2017 / Revised: 18 November 2017 / Accepted: 5 December 2017 / Published: 8 December 2017
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Harmonic pollution of double fed induction generators (DFIGs) has become a vital concern for its undesirable effects on power quality issues of wind generation systems and grid-connected system, and the double pulse width modulation (PWM)converter is one of the main harmonic sources in DFIGs. Thus the harmonic analysis of the converter in DFIGs is a necessary step to evaluate their harmonic pollution of DFIGs. This paper proposes a detailed harmonic modeling method to discuss the main harmonic components in a converter. In general the harmonic modeling could be divided into the low-order harmonic part (up to 30th order) and the high-order harmonic part (greater than order 30) parts in general. The low-order harmonics are produced by the circuit topology and control algorithm, and the harmonic component will be different if the control strategy changes. The high-order harmonics are produced by the modulation of the switching function to the dc variable. In this paper, the low-order harmonic modeling is established according to the directions of power flow under the vector control (VC), and the high-order harmonic modeling is established by the switching function of space vector PWM and dc currents. Meanwhile, the simulations of harmonic a components in a converter are accomplished in a real time digital simulation system. The results indicate that the proposed modeling could effectively show the harmonics distribution of the converter in DFIGs. View Full-Text
Keywords: harmonic modeling; double pulse width modulation (PWM)converter; double fed induction generator (DFIG); switching function harmonic modeling; double pulse width modulation (PWM)converter; double fed induction generator (DFIG); switching function

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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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Liu, J.; Liu, Z. Harmonic Analyzing of the Double PWM Converter in DFIG Based on Mathematical Model. Energies 2017, 10, 2087.

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