The results of this method are in agreement with those calculated in quasi-TEM case in low frequency for confocal ellipses.

在共焦椭圆情况下，当频率较低时，本文结果与准TEM波分析结果趋于一致。

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The early works of direct methods utilized the quasi-linearity of transient energy margin (TEM) to approximate the transient stability limits, which opened an era of this area.

早期直接法将线性度较好的暂态能量裕度用于求取暂态稳定极限，从而开辟了对这一领域的研究。

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