secondary control definition
secondary control means a device or braking but brings about a change in the state or functioning of the vehicle or the vehicle’s ancillary subsystems
secondary control means the function to restore the frequency and the interchange power flow with other control areas to their set values following an imbalance between the active load generated and consumed; secondary control is activated automatically or, if necessary, manually, and may make use of centralised or decentralised facilities. Outage reserve is also part of secondary control. The reestablishment of the target frequency can take several minutes;