What happens to the AGC when there is a frequency bias and a loss in generation in an external area?

When there is a frequency bias along with a loss of generation in an external area, the Automatic Generation Control (AGC) system responds by increasing generation. The AGC is designed to maintain system frequency and balance generation with load. When the frequency drops due to a loss of generation, the AGC detects this change through its frequency measurement.

In order to counteract the reduction of power supply, the AGC automatically signals generators to increase output. This response is critical to restoring the frequency to its nominal level and ensuring the reliability of the power system. The ability of the AGC to autonomously adjust generation is one of its key functions, designed to maintain system stability and prevent larger disruptions.

In scenarios where there is a frequency bias, which can occur due to uneven load distribution or external influences, the AGC utilizes its programmed settings to make necessary adjustments, promoting an increase in generation output to restore balance. Therefore, the correct understanding of AGC behavior in such situations aligns with its role in maintaining system frequency and stability.