Control of DFIG-Based Wind Generation Systems under Unbalanced Network Supply
Control of DFIG-Based Wind Generation Systems under Unbalanced Network Supply
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DOI：
10.1109/iemdc.2007.382706
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发表时间：
2007-05
期刊：
影响因子：
--
通讯作者：
Yi Wang;Lie Xu
中科院分区：
文献类型：
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作者：
Yi Wang;Lie Xu
为了提高DFIG系统在电网不平衡条件下的性能和稳定性，本文建立了DFIG系统的动态模型和控制方案。提出了一种基于定子电压定向的包含正负序分量的动态DFIG模型。该模型准确地描述了电网不平衡时的有功功率、无功功率和转矩振荡，为DFIG控制系统的设计提供了依据。讨论了消除转矩、有功/无功振荡等各种控制目标，给出了实现不同控制目标所需的转子负序电流。利用MatLab/Simulink对基于DFIG的风力机在不平衡条件下的性能进行了仿真研究。在电网不平衡时，所提出的控制方案显著抑制了DFIG转矩或有功功率振荡，而传统控制方案存在明显的转矩/功率振荡。
This paper develops a dynamic model and control scheme for DFIG systems to improve the performance and stability under unbalanced grid conditions. A dynamic DFIG model containing the positive and negative sequence components is presented using stator voltage orientation. The proposed model accurately illustrates the active power, reactive power and torque oscillations, and provides a basis for DFIG control system design during unbalanced network supply. Various control targets such as eliminating the oscillations of the torque, active/reactive power are discussed and the required rotor negative sequence current for fulfilling different control targets are described. Performance of a DFIG-based wind turbine under unbalanced condition using the proposed control method is evaluated by simulation studies using Matlab/Simulink. The proposed control scheme significantly attenuates the DFIG torque or active power oscillations during network unbalance whereas significant torque/power oscillations exist with the conventional control schemes.