| Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions |
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| 作者姓名： | HU Jia-bing HE Yi-kang NIAN Heng |
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| 作者单位： | School of Electrical Engineering，Zhejiang University，Hangzhou 310027，China |
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| 基金项目： | Project （No. 50577056） supported by the National Natural Science Foundation of China |
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| 摘 要： | 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.
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| 关 键 词： | 不稳定电压 双反馈异步发电机 电压电源变流器 脉宽调制 |
| 收稿时间： | 2 March 2007 |
| 修稿时间： | 2007-03-022007-05-19 |
Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions |
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| 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,2007,8(8):1330-1339. |
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| Authors: | Hu Jia-bing He Yi-kang Nian Heng |
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| Institution: | (1) 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 doublyfed 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.
Project (No. 50577056) supported by the National Natural Science Foundation of China |
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| Keywords: | Unbalanced grid voltage Doubly-fed induction generator (DFIG) Back-to-back (BTB) Fault-ride through (FRT) Voltage source converter (VSC) |
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