The application scope of the tran sient energy of power system has been extended and a simple method for calculati ng the optimal switching time of pang-pang controlled series capacitor was propo sed.

• 本文将电力系统中的暂态能量函数的应用范围作了推广，给出了一种利用系统暂态能量来计算乓-乓控制的串补电容最优投退时刻的方法。此方法计算简单，控制规律易于实现。