What should be done if the Interconnection frequency is 60.20 Hz and the ACE is a large positive value?

What should be done if the Interconnection frequency is 60.20 Hz and the ACE is a large positive value?

• A. Suspend AGC and investigate.
• B. Place AGC in flat tie line control.
• C. Leave AGC in operation as your units respond.
• D. Place AGC in constant frequency control.

Answer: (C)

In this scenario, when the interconnection frequency is at 60.20 Hz and the Area Control Error (ACE) is a large positive value, the appropriate action is to leave the Automatic Generation Control (AGC) in operation as your units respond. This approach is essential because keeping AGC operational allows the generation units to adjust their output automatically in response to changes in system frequency and load. In this case, since the frequency is above the nominal level of 60 Hz, it indicates that there is too much generation relative to the load. AGC will work to reduce generation in response to the high positive ACE, which signals excess power generation. Leaving AGC in operation ensures that generating units can react dynamically to the conditions, helping to stabilize the frequency back toward the target range. This is a critical function of AGC in maintaining the reliability of the power system, ensuring that generation matches load while keeping the frequency within acceptable limits. Other options may involve pausing or altering the control strategies, which could lead to further instability in the power system and potentially exacerbate the frequency deviation rather than correct it.

In this scenario, when the interconnection frequency is at 60.20 Hz and the Area Control Error (ACE) is a large positive value, the appropriate action is to leave the Automatic Generation Control (AGC) in operation as your units respond.

This approach is essential because keeping AGC operational allows the generation units to adjust their output automatically in response to changes in system frequency and load. In this case, since the frequency is above the nominal level of 60 Hz, it indicates that there is too much generation relative to the load. AGC will work to reduce generation in response to the high positive ACE, which signals excess power generation.

Leaving AGC in operation ensures that generating units can react dynamically to the conditions, helping to stabilize the frequency back toward the target range. This is a critical function of AGC in maintaining the reliability of the power system, ensuring that generation matches load while keeping the frequency within acceptable limits.

Other options may involve pausing or altering the control strategies, which could lead to further instability in the power system and potentially exacerbate the frequency deviation rather than correct it.