小水电机群对特高压电网功率振荡特性的影响研究

发布时间：2018-08-26 17:20

【摘要】：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。
[Abstract]:In order to analyze the cluster effect caused by a large number of small hydropower units concentrated in the region and the risk of forced power oscillation in the main network caused by the weak damping oscillation mode among these units, the small hydropower cluster in Enshi area of Hubei Province is taken as the research object. Based on the operation mode model of Hubei power grid with high water and high load, the characteristics of low frequency power oscillation of Huazhong-North China main network and UHV tie-line are analyzed when the detailed model is adopted for small hydropower units in Enshi area. The results show that there are weak damping oscillation modes with damping ratio of nearly 3% in the small hydropower cluster in Enshi area, and these generators participate in the three Gorges unit dominated oscillation mode. In some special cases, the small hydropower cluster can induce the main network to produce hundreds of MW forced power oscillations. In this paper, a path diagram of oscillation propagation is proposed to indicate the path and influence range of the oscillation spreading outward. The analysis shows that its influence on the three Gorges and UHV power grid is relatively small.
【作者单位】：华中科技大学能源与动力工程学院;华中科技大学电气与电子工程学院强电磁工程与新技术国家重点实验室;
【基金】：国家自然科学基金(51177057)~~
【分类号】：TM712

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