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电网技术  2010 

局部弱联诱发互联电网强迫振荡机制分析

, PP. 36-43

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Abstract:

本文应用扩展的多自由度强迫振动理论和特征值分析方法,研究局部弱联诱发互联电网发生区域强迫振荡的机理。针对中国电力网络现阶段互联的特点,指出弱阻尼局部振荡是系统稳定运行的潜在威胁。对此重点分析了电力系统多机强迫振荡与系统固有振荡频率、机组相关因子的关系,提出如果扰动源振荡频率接近区间振荡模式,局部振荡机组满足与区间振荡模式相关性较强等条件,就会诱发系统发生区域强迫低频振荡。最后根据WAMS记录的数据,应用该机理分析了华中电网的两次强迫低频振荡事故,分析结果验证了该机理的合理性和正确性。

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