Turbine Fast Valving to Aid System Stability: Benefits and Other Considerations

Fast valving of steam turbines is a means of rapid reduction of mechanical power on turbine-generators to prevent rotor angle instability when a significant power-load imbalance is sensed. Fast valving and early valve actuation (EVA) are equivalent terms. It is a potentially useful aid to system stability that has not been widely applied for several reasons. The four "short note" reports describe implementations of several methods of fast valving and discuss application considerations.