What is the impact of a governor with a droop less than 0% on system performance?

A governor with a droop less than 0% can significantly affect system performance by promoting instability in frequency control. In power systems, droop is a characteristic of governors that determines how much the output power will change in response to frequency variations. A positive droop value indicates that as the frequency decreases, the generator output increases—or conversely, that as frequency increases, the generator output decreases. This relationship helps stabilize the system by allowing generators to naturally balance load and generation.

When a governor has a droop value of less than 0%, this essentially means that a decrease in frequency will cause an increase in output, contrary to normal governing behavior. Instead of stabilizing frequency, such a governor will exacerbate frequency declines because it will back down output when there is a frequency drop, resulting in lower overall system frequency. This condition can lead to frequency oscillations and reduce overall system reliability, making it difficult to maintain stable operations.

In summary, the choice indicating that a governor with a droop less than 0% is likely to lead to frequency instability is accurate because it disrupts the necessary balancing act that is crucial for system stability. It highlights the importance of droop settings in maintaining a reliable and stable electrical system.