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基于起振段波形在线判别电力系统功率振荡性质

, PP. 54-60

Keywords: 电力系统,功率振荡,负阻尼振荡,强迫振荡,二次差分法

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Abstract:

电力系统功率振荡的主要分为负阻尼和强迫型振荡2种。这2种振荡的表现形式很相似,但采取的应对措施差别很大。为快速有效地判别振荡性质从而采取适当的措施抑制功率振荡,提出了一种基于起振段波形的二次差分法及相应的判别准则。针对2类功率振荡的起因及特点,通过比较该方法计算的每个周期中功率最大值(或峰峰值)的一次差分和二次差分的符号,即可在功率振荡发生后的几个或十几个周波内快速判别振荡性质。最后,采用多个实际电网的振荡实例验证了该方法的有效性及实用性。

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