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小水电机群对特高压电网功率振荡特性的影响研究

DOI: 10.13336/j.1003-6520.hve.2015.03.009, PP. 762-769

Keywords: 小水电机组,发电机建模,小干扰稳定性,强迫功率振荡,特高压,振荡传播路径图

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Abstract:

为了分析区域内集中的大量小水电机组所产生的群集效应以及这些机组之间的弱阻尼振荡模式引发主网强迫功率振荡的风险,以湖北恩施地区小水电机群为研究对象,在某年度湖北电网丰水大负荷运行方式模型的基础上,分析了恩施地区小水电机组采用详细模型时,华中—华北主网以及特高压联络线的低频功率振荡特性,结果表明恩施地区小水电机群内部存在阻尼比接近3%的弱阻尼振荡模式,并且这些发电机参与了三峡机组主导的振荡模式;进一步的仿真研究表明,在某些特殊情况下小水电机群可诱导主网产生上百MW的强迫功率振荡;针对该现象文中提出了一种振荡传播路径图用于指明振荡向外传播扩散的路径与影响范围,分析表明其对三峡以及特高压电网的影响比较小。

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