Power system collapse is the result of cascaded outage, its damage is severe.
电力系统灾变，是事故连锁发生的汇集，后果十分严重。
In recent years, more and more researchers have realized that voltage stability of power system is a dynamic phenomenon, and voltage collapse point can be predicted in advance.
近些年，越来越多的人认识到电力系统电压稳定问题是一个动态问题，而电压崩溃点是可以提前预知的。
However, the danger of frequency collapse always exists, and has a great impact for power system running.
但是，频率崩溃的危险是始终存在的，并对电力系统的安全稳定运行造成了很大的影响。
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