Underfrequency Load Shedding (UFLS), which is the third defensive line of power system, is one of effective methods to mitigate the frequency collapses.
低频减负荷（UFLS）作为电力系统的第三道防线，是一种防止系统频率崩溃的有效手段。
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Underfrequency load shedding (UFLS) is a widely accepted effective measure to repress further frequency drop. Most of UFLS schemes use pre specified steps based on measured frequency to shed load.