What is the primary purpose of Under Frequency Load Shedding (UFLS)?

The primary purpose of Under Frequency Load Shedding (UFLS) is to effectively balance generation and load on the electric grid during conditions when the frequency drops below a certain threshold. This frequency drop typically indicates that the electrical demand is exceeding the available generation resources. UFLS systems are designed to automatically disconnect a predefined amount of load when the system frequency declines to help stabilize the grid by reducing demand.

By shedding load, UFLS helps to restore the balance between generation and load, which is critical for preventing more severe system disturbances or blackouts. Maintaining this balance is essential for the overall stability and functioning of the electrical grid, as significant discrepancies can lead to cascading failures. Thus, the correct answer highlights UFLS's role in achieving equilibrium between electricity supply and consumption, which is vital for reliable grid operations.