Primary frequency control

The primary frequency control (PC) of a generating unit is a local automatic control provided by primary control circuits and consists of a precisely defined change in the power output of a certain generating unit in response to a frequency deviation from its set value.

The value of the required change in generating unit power output in response to a system frequency deviation is determined by the statics of primary frequency control. An adequate primary control reserve must be available at the respective generating unit at all times in order to provide this service. The value of this reserve depends on the generating unit’s technological parameters and Transmission System Operator requirements. The generating unit operator must ensure that the required control reserve be enabled within 30 seconds of the time at which the imbalance occurs.


This AnS is part of AnS Contracts.