Power system operations and control: Difference between revisions

Revision as of 16:03, 24 January 2023

Revision as of 20:06, 3 February 2023

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== Time control ==

{{main|Time error correction (TEC)}}

The goal of the '''time control''' is to maintain the long-term frequency at the specified value within a [[wide area synchronous grid]]. Due to the disturbances, the average frequency drifts, and a ''time error'' accumulates between the official time and the time measured in the AC cycles. In the US, the average 60 Hz frequency is maintained within each [[Wide area synchronous grid|interconnection]] by a designated entity, '''time monitor''', that periodically forceschanges athe frequency target of the grid frequency(''scheduled changefrequency''{{sfn|NERC|2021|p=1}}) to bring the overall time offset within the predefined limits. For example, in the [[Eastern Interconnection]] the action (temporarily setting the frequency to 60.02 Hz or 59.98 Hz) is initiated when the time offset reaches 10 seconds and ceases once the offset reaches 6 seconds. Time control is performed either by a computer (''Automatic Time Error Correction''), or by the monitor requesting balancing authorities to adjust their settings.{{sfn|NERC|2011|pp=13-14}}

== References ==