Effect of Prime-Mover Speed Control Characteristics on Electric Power System Performance

During normal operation the prime-mover speed governors function principally as stabilizers, automatic power-frequency control taking over the job of maintaining tie-line power schedules, frequency, and time. The prime importance of dead band is reemphasized. During disturbances governors affect both frequency drop and relatively long-term power swings, but generation schedules are of equal importance in certain cases.