What fraction of frequency bias does Time Error Correction use when unable to adjust scheduled frequency?

Time Error Correction (TEC) is a methodology used in power system operations to address frequency deviations and ensure system reliability. When the scheduled frequency cannot be adjusted, TEC employs a specific fraction of frequency bias to help correct time error – the instances when the system clock is out of sync due to frequency variations.

In practice, Time Error Correction uses 20% of the established frequency bias when making adjustments. This is considered a balanced approach, allowing enough influence on the system to rectify time errors without excessively altering operating parameters which could destabilize the grid or create operational challenges.

Utilizing 20% helps ensure that corrective actions are measured and controlled, contributing to the overall stability of the power system while still addressing frequency inaccuracies resulting from the inability to adjust scheduled frequency. This allows grid operators to effectively manage and maintain system synchronization and reliability during conditions that necessitate such adjustments.