| 摘要 |
<p>PURPOSE:To suppress low-frequency resonance and to stabilize a power line system, by detecting the torsional vibration of a shaft which connects a synchronous machine to a turbine and picking out only a prescribed natural frequency component from the detected vibration to control a field voltage. CONSTITUTION:The shaft 4b, to which the synchronous machine 1 and the turbines 3-7 are directly coupled, is equipped with a shaft torsion detection unit 8 comprising an energy feeder, a shaft torsion detector and a receiver. The output signal of the detection unit 8 is applied to mode separation filters 9a-9d whose tuned frequency levels are equal to shaft torsion natural frequency levels determined by a spring constant of the shaft and the inertial constants of material points of the shaft. Addition to the detected value of the terminal voltage of the synchronous machine 1 is effected by an addition circuit 15 to perform ignition control on the gates of SCR's which regulate a field system F. As a result, a braking effect can be equivalently applied to a particular shaft torsion natural frequency component to quickly stabilize a power line system.</p> |
