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Received: 2007-03-02

Revision Accepted: 2007-05-19

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Journal of Zhejiang University SCIENCE A 2007 Vol.8 No.8 P.1330-1339


Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions

Author(s):  HU Jia-bing, HE Yi-kang, NIAN Heng

Affiliation(s):  School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   emec_zju@zju.edu.cn, ykhe@zju.edu.cn

Key Words:  Unbalanced grid voltage, Doubly-fed induction generator (DFIG), Back-to-back (BTB), Fault-ride through (FRT), Voltage source converter (VSC)

HU Jia-bing, HE Yi-kang, NIAN Heng. Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions[J]. Journal of Zhejiang University Science A, 2007, 8(8): 1330-1339.

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author="HU Jia-bing, HE Yi-kang, NIAN Heng",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions
%A HU Jia-bing
%A HE Yi-kang
%A NIAN Heng
%J Journal of Zhejiang University SCIENCE A
%V 8
%N 8
%P 1330-1339
%@ 1673-565X
%D 2007
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2007.A1330

T1 - Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions
A1 - HU Jia-bing
A1 - HE Yi-kang
A1 - NIAN Heng
J0 - Journal of Zhejiang University Science A
VL - 8
IS - 8
SP - 1330
EP - 1339
%@ 1673-565X
Y1 - 2007
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2007.A1330

This paper presents a unified positive- and negative-sequence dual-dq dynamic model of wind-turbine driven doubly-fed induction generator (DFIG) under unbalanced grid voltage conditions. Strategies for enhanced control and operation of a DFIG-used back-to-back (BTB) PWM voltage source converter (VSC) are proposed. The modified control design for the grid-side converter in the stationary αβ frames diminishes the amplitude of DC-link voltage ripples of twice the grid frequency, and the two proposed control targets for the rotor-side converter are alternatively achieved, which, as a result, improve the fault-ride through (FRT) capability of the DFIG based wind power generation systems during unbalanced network supply. A complete unbalanced control scheme with both grid- and rotor-side converters included is designed. Finally, simulation was carried out on a 1.5 MW wind-turbine driven DFIG system and the validity of the developed unified model and the feasibility of the proposed control strategies are all confirmed by the simulated results.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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