非对称电网故障下的双馈风电机组低电压穿越暂态控制策略

发布时间：2018-05-01 06:11

本文选题：暂态补偿 + 低电压穿越　；参考：《电力系统自动化》2014年18期

【摘要】：传统基于Crowbar的低电压穿越(LVRT)解决方案不仅没有充分利用变流器对双馈感应发电机(DFIG)的控制灵活性,而且也难以较好地适应当今不断提升的并网要求。而当前非对称电网故障下的暂态补偿控制策略也缺乏相应的实验验证。鉴于此,文中对电网电压发生跌落故障时定、转子电磁暂态过程进行了深入分析和讨论,并针对非对称故障时转子端过电压主要由定子磁链直流分量和负序分量引起这一现象,研究了一种有效的LVRT控制策略。该策略通过在DFIG转子侧适时准确地分别注入与磁链直流分量和负序分量相对应的暂态补偿量,最大限度地减小暂态转子电压冲击,提高DFIG的暂态可控性,拓展可穿越的电压故障范围,进而改善双馈风电机组的LVRT性能。11kW模拟机组的实验验证了所述分析和设计。
[Abstract]:The traditional low voltage traversing (Crowbar) based solution not only does not make full use of the control flexibility of the converter to the doubly-fed induction generator (DFIGG), but also is difficult to adapt to the rising requirements of grid connection. However, the current transient compensation control strategy for asymmetric power network fault is also lack of corresponding experimental verification. In view of this, the electromagnetic transient process of stator and rotor is deeply analyzed and discussed in this paper. The overvoltage at rotor end is mainly caused by DC component and negative sequence component of stator flux in asymmetric fault. An effective LVRT control strategy is studied. In this strategy, the transient compensation corresponding to the DC and negative sequence components of the flux is injected into the rotor side of the DFIG to minimize the voltage impulse of the transient rotor and to improve the transient controllability of the DFIG. The LVRT performance of doubly-fed wind turbine is improved by expanding the range of voltage faults which can be traversed, and the experimental results of 11kW analog unit verify the analysis and design.
【作者单位】：合肥工业大学电气与自动化工程学院;
【基金】：国家自然科学基金资助项目(51107025)~~
【分类号】：TM614

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