宋绍剑;王铮;刘斌;廖碧莲;吴永谦;

• 1:广西大学电气工程学院

摘要(Abstract)：

双馈风力发电机(doubly-fed induction generator,DFIG)的阻抗模型是分析和抑制风力发电机并网振荡问题的有效手段之一。在实际工程中,DFIG机组通常通过Y/D升压变压器接入输电网,但是现有的阻抗模型仅考虑DFIG本身模型,而未考虑网侧变压器以及线路阻抗对模型的影响,影响稳定分析的准确度。为了更加准确地分析DFIG风机与电网的之间交互行为,采用谐波线性化的方法,建立了计及变压器和线路阻抗的DFIG转子侧的正负序阻抗模型。该模型不但包含了异步电机、转子侧变换器、锁相环(phase-locked loop,PLL)以及控制环路,同时在建模的过程中考虑了网侧的线路阻抗和变压器对模型的影响。然后,通过频域仿真分析锁相环、变压器以及电网线路阻抗等因素对转子侧的正负序阻抗模型的影响。最后,与时域仿真结果作对比,验证了阻抗模型的正确性。结果表明:并网变压器对DFIG转子侧的正序阻抗模型的相角特性影响较大,而对幅值特性影响较小;通过DFIG转子侧阻抗模型可以预测DFIG与电网阻抗交互作用潜在的并网谐振点。

关键词(KeyWords)： 双馈风力发电机;网侧变压器;线路阻抗;谐波线性化;正负序阻抗模型

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 宋绍剑;王铮;刘斌;廖碧莲;吴永谦;

Email:

DOI: 10.13335/j.1000-3673.pst.2018.1798

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