What is the threshold for Underfrequency Load Shedding (UFLS) and Under Voltage Load Shedding (UVLS)?

Underfrequency Load Shedding (UFLS) and Under Voltage Load Shedding (UVLS) are critical components of grid stability, used as protective measures to avoid system collapse during incidents such as generation loss or sudden fluctuations in load.

The threshold for these schemes often refers to the amount of load that can be shed to maintain system reliability. The value of 300MW as the threshold signifies a balance where enough load can be dropped to stabilize the frequency and voltage levels while avoiding excessive impacts on customers. Setting the threshold at this value allows system operators to react effectively to disturbances without compromising overall grid integrity and reliability.

When configuring these protection systems, it is essential to tailor the shedding capabilities to the specific characteristics and needs of the power system. Utilizing a threshold that is too low might lead to unnecessary load shedding during minor disturbances, while a threshold that is too high might not provide adequate support during larger systemic issues.

In practical applications, thresholds are often determined based on historical data, simulations, and the operational characteristics of the grid to ensure effective load shedding occurs when necessary, thus improving the overall reliability and resilience of the power system.