线路电抗对系统小干扰稳定性的影响

Effect of Line Reactance on Small-signal Stability in Power System

针对输电线路电抗对系统小干扰稳定性的影响,采用发电机经典二阶模型,通过特征值灵敏度计算,指出对系统小干扰稳定性影响最大的线路往往是两互联系统联络线,同时提出了计算转折点处电抗值(X=0.041)的方法,系统受到微小扰动后,当X=0.044时发电机功角呈增幅振荡趋势;当X=0.041时,发电机功角呈减幅振荡趋势。为线路安装可控电抗器提供参考依据。

Transmission-line reactance is one of significant facts impacting on small-signal stability, adopting the classic second derivative of y with respect to x model of generator, through calculating eigenvalue sensitivity, this paper gets the line, which is the most significant facts impacting on small-signal stability in power system. Generally this line is the tie line of two areas. The reactance calculation method on the transition location （X= 0. 041）is also provided. After the system on a small-signal, the growing oscillation tendency of the generator power and angle is occurred when X= 0. 044 and the decaying oscillation tendency of the generator power and angle is occurred when X = 0. 041. This paper provides a principle of calculating reactance, which can be used as a powerful tool for installing controlled reactor. The foundation of installing controlled reactor is refered.