What is under frequency load shedding?

Under frequency load shedding (UFLS) is a protective measure used in electrical power systems to maintain stability and prevent a complete blackout. When the frequency of the electrical grid drops below a predetermined threshold, UFLS automatically disconnects a portion of the load, or electricity demand, to restore balance between generation and consumption. This process helps prevent further frequency decline and allows the system to stabilize by reducing the overall demand. UFLS is typically implemented in a staged approach, targeting specific loads based on their criticality and impact on the grid.