What AGC mode should a BA operating asynchronously switch to?

When a Balancing Authority (BA) operates asynchronously, the appropriate Automatic Generation Control (AGC) mode to switch to is Flat Frequency Control. This mode is designed to maintain system frequency at a nominal level when frequency deviations occur, while managing the generation output without responding to changes in load in a dynamic fashion.

In asynchronous operations, the interconnected systems might not have a consistent frequency relationship due to variations in load or generation. Flat Frequency Control simplifies response by controlling generation to maintain a specific frequency, rather than adjusting output based on real-time load changes, which is particularly useful when there is a lack of real-time communication and coordination with other BAs.

This AGC mode focuses on stabilizing the frequency for the BA's own area and is essential when moving away from more dynamic approaches that might not be practical in conditions where synchronization with other systems is lost. In summary, Flat Frequency Control provides a stable method for managing generation and ensuring frequency stability during asynchronous operations, which is crucial for reliability in the electric grid.