Reactive power optimal control of doubly fed induction wind generators under unbalanced grid voltage swell

被引：0
作者：
School of Electrical Engineering and Automation, Hefei University of Technology, Heifei [1 ]
Anhui Province
230009, China
机构：
[1] School of Electrical Engineering and Automation, Hefei University of Technology, Heifei, 230009, Anhui Province
来源：
Zhongguo Dianji Gongcheng Xuebao | / 13卷 / 3211-3220期
基金：
中国国家自然科学基金;
关键词：
Doubly fed induction generator (DFIG); Reactive power; The rotor converter; Unsymmetrical swell; Voltage support;
D O I：
10.13334/j.0258-8013.pcsee.2015.13.003
中图分类号：
学科分类号：
摘要：
When the grid voltage unsymmetrical swell, if only positive sequence inductive reactive power is injected into the grid and a large grid impedance exists, which will reduce the unchanged terminal phase voltage of the generator, the unbalance factor of the terminal generator voltage will enlarge and the ripple of stator reactive power will become bigger. Therefore, it is necessary to inject a corresponding stator-side negative sequence reactive power to adjust it. In order to optimize the reactive power control strategy when the grid voltage unsymmetrical swells, firstly the mathematical model of doubly fed induction wind generators under the fault mentioned above was deduced. Then this paper analyzed the positive and negative sequence reactive current assignment of the rotor-side converter and discussed the coupling effects of stator-side positive and negative reactive power on the network support at the point of common coupling (PCC), the generator terminal voltage unbalance factor and the pulsating stator reactive power. Based on the above analysis, a flexible positive and negative sequence closed-loop voltage control strategy of the reactive power optimization was adopted to achieve the composite control objectives when the grid voltages unsymmetrical swell. Finally simulations and experimental results verify the effectiveness and feasibility of the control strategy. © 2015 Chin. Soc. for Elec. Eng.
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收藏
页码：3211 / 3220
页数：9
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