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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The quasi-static input-output linear regression equation of the measuring system is established, and the testing results of input-output curve linearity and sluggishness are given.

建立了该检测系统的准静态输入输出线性回归方程；测试了系统的输入输出特性曲线、线性度和迟滞性；

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