What describes a Flat frequency control in terms of governor operation?

Flat frequency control in terms of governor operation is characterized by the ability to maintain a set frequency despite the variability in load conditions. This means that as load demands change, the system responds dynamically to adjust the generation output to keep the frequency stable at a predetermined level. This type of control is crucial for ensuring that the power system operates reliably and efficiently, as maintaining a stable frequency allows for the smooth operation of electrical devices and systems.

The overall operation involves the governors of generators continuously monitoring the system frequency and making necessary adjustments to the output. This ensures that any fluctuations caused by varying load demands do not lead to instability in the grid.

In contrast, other options do not accurately represent the concept of flat frequency control. For example, adjusting output based solely on frequency deviations, only working during low load conditions, or being exclusive to hydro plants does not capture the comprehensive and consistent nature of flat frequency control across varying load scenarios. This type of operation is applicable to a variety of generation sources and is not limited to particular operating conditions or specific types of plants.