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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2007, Vol. 8 Issue (8): 1330-1339    DOI: 10.1631/jzus.2007.A1330
Information Science     
Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions
HU Jia-bing, HE Yi-kang, NIAN Heng
School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  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.

Key words： Unbalanced grid voltage      Doubly-fed induction generator (DFIG)      Back-to-back (BTB)      Fault-ride through (FRT)      Voltage source converter (VSC)     
Received: 02 March 2007     
CLC:  TM315  
  TM614  
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HU Jia-bing
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NIAN Heng
Cite this article:

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

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2007.A1330     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2007/V8/I8/1330

[1] Jia-bing HU, Yi-kang HE, Hong-sheng WANG. Adaptive rotor current control for wind-turbine driven DFIG using resonant controllers in a rotor rotating reference frame[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2008, 9(2): 149-155.
[2] Jia-bing HU, Yi-kang HE, Lie XU. Dynamic modeling and direct power control of wind turbine driven DFIG under unbalanced network voltage conditions[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2008, 9(12): 1731-1740.
[3] HU Jia-bing, HE Yi-kang. Dynamic modelling and robust current control of wind-turbine driven DFIG during external AC voltage dip[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2006, 7(10): 19-.