Rate of Change of Frequency method Requires a Minimum power mismatch of ____? 5% 10% 15% 20%

To determine the minimum power mismatch required for the Rate of Change of Frequency (RoCoF) method, we need to examine the context in which this parameter is typically set.

The RoCoF method is often utilized in power system frequency control and can handle variations effectively up to a certain threshold of power mismatch. Common practice generally identifies a minimum power mismatch that is manageable without causing significant instability or operational issues in the grid.

The options presented are: 5%, 10%, 15%, and 20%.

In most practical applications, a minimum power mismatch of 5% is often considered as an acceptable threshold, as it allows for efficient frequency control while minimizing the risk of substantial deviations that could result in system instability. Higher percentages might not be sustainable, as they can lead to significant fluctuations in frequency and potential adverse outcomes within the power system.

Thus, the answer is that the RoCoF method typically requires a minimum power mismatch of 5%.