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A novel control scheme for DFIG-based wind energy systems under unbalancedgrid conditions

机译：不平衡电网条件下基于DFIG的风能系统的新型控制方案

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摘要

This paper presents an analysis and a novel control scheme for a doubly fed induction generator (DFIG) based wind energy generation under unbalanced grid voltage conditions. The control objectives are: (i) to limit the rotor currents, (ii) to suppress ripples in the torque and (iii) to suppress the dc-link voltage fluctuation through converter controls. Negative sequence compensation techniques by one of the converters, namely, the rotor side converter (RSC) or the grid side converter (GSC) in a DFIG are discussed and their limitations are presented. A coordinated control scheme with a concise structure compared to the conventional dual sequence control structure is proposed in this paper. The RSC is controlled to suppress ripples in the torque and the rotor currents while the GSC is controlled to suppress ripples in the dc-link voltage by considering the rotor power effect. The major contributions of the paper include: (i) the presentation of the limitation of negative sequence compensation using one converter;(ii) development of a concise coordination control scheme which is free of low pass filters and uses a reduced number of reference frame transformation. Matlab/Simulink tests for a 2MW DFIG demonstrate the effectiveness of the control scheme.
机译：本文提出了在不平衡电网电压条件下基于双馈感应发电机（DFIG）的风能发电的分析和新型控制方案。控制目标是：（i）限制转子电流，（ii）抑制转矩波动，以及（iii）通过转换器控制来抑制直流母线电压波动。讨论了其中一种转换器（即DFIG中的转子侧转换器（RSC）或电网侧转换器（GSC））的负序补偿技术，并提出了其局限性。提出了一种与传统的双序列控制结构相比结构简洁的协调控制方案。通过考虑转子功率效应，控制RSC来抑制转矩和转子电流中的波动，而控制GSC来抑制直流链路电压中的波动。该论文的主要贡献包括：（i）使用一个转换器来表示负序补偿的局限性；（ii）开发一种简洁的协调控制方案，该方案没有低通滤波器，并且使用了数量较少的参考帧变换。用于2MW DFIG的Matlab / Simulink测试证明了该控制方案的有效性。

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