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电网技术  2014 

投撬棒后双馈风机暂态电势的变化特性分析

DOI: 10.13335/j.1000-3673.pst.2014.10.022, PP. 2759-2765

Keywords: 双馈风机,撬棒电路,暂态电势,转子磁链

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Abstract:

双馈感应风机(doubly-fedinductiongenerator,DFIG)暂态等值模型成为近年来继电保护工作者的研究焦点之一。针对双馈风机投入撬棒这一运行工况,在分析转子磁链变化过程的基础上,定量研究了双馈风机暂态电势的变化特性。指出由于转差的存在,暂态电势中出现了转差频率交变分量;撬棒电阻的投入,加快了暂态电势中衰减分量的衰减速度。使得双馈风机的暂态电势呈现出快变特性,不同于传统同步发电机暂态电势慢变的特点,并通过仿真验证了理论分析的正确性。为进一步的双馈风机暂态等值模型的建立及风电场保护策略的研究提供理论依据。

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