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电网技术  2015 

实际系统次同步谐振建模方法

DOI: 10.13335/j.1000-3673.pst.2015.04.028, PP. 1059-1066

Keywords: 次同步谐振,传统建模方法,阻抗频率特性,新建模方法

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Abstract:

传统次同步谐振建模方法不能确保所建立的模型分析结果能够满足工程实际的精度需求。文中分析了传统次同步谐振建模方法不精确的本质原因是等值阻抗频率特性不能反映原系统的阻抗频率特性。根据等值阻抗频率特性误差大小的分布规律,提出通过逐渐扩大建模区域,以次同步模态阻尼收敛为判据来建立实际系统次同步谐振模型的新方法。该方法以系统节点处等值产生的次同步谐振误差大小为原则确定每次建模模型的边界,最终获得合理的建模区域。应用修改的IEEE39节点系统,研究了不同的建模规模对次同步谐振分析结果的影响,验证了建模方法的有效性。

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