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基于定转子转矩分析法的双馈风机次同步谐振机理研究

DOI: 10.13334/j.0258-8013.pcsee.2015.19.003, PP. 4861-4869

Keywords: 双馈风机,次同步谐振,机理解释,定转子转矩分析,主导因素

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Abstract:

从双馈风机电磁转矩表达式出发,将转速变化时导致的电磁转矩变化量分为定子转矩变化量和转子转矩变化量两部分。在推导定子、转子电磁转矩与转速的关系式后,利用关系式的幅频和相频响应,分别研究定子、转子电磁转矩及总电磁转矩对转速变化量的作用,从而解释双馈风机串补系统发生次同步谐振的原因。按照此方法,研究了转速、串补度、控制器参数对风机串补系统次同步谐振特性的影响。结果表明,转子电磁转矩对次同步谐振起正阻尼的作用,定子电磁转矩对次同步谐振作用的性质与振荡频率有关。风机转速及转子侧变流器内环比例系数变化主要影响转子电磁转矩,串补度变化主要影响定子电磁转矩。

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