Fast Valving as an Aid to Power System Transient Stability and Prompt Resynchronization and Rapid Reload After Full Load Rejection

As steam turbine generator units increase in rating, their inertia constants tend to decrease and their reactance constants to increase, thus aggravating the power system transient stability problem. There is also a tendency for the complete unit to take longer to restart and reload when unscheduled disconnection from the system takes place. Counter measures are needed and may be available within the power plant. A study of these measures was made by the authors acting as a Working Group of NewEngland´s NEPLAN Planning Committee´s System Design Task Force. The paper presents the Working Group´s findings as widely supported by the major utilities in New England.