Secondary excitation control method for AC excitation synchronous machine

摘要

PURPOSE:To alleviate vibrations of an AC excited synchronous machine and a pump water wheel, to increase their lives and to deal with instantaneous input and output increase/decrease command within an allowable variable speed operating range by suppressing increases in the numbers of revolutions of the machine and the wheel at the time of shutting OFF a load. CONSTITUTION:Energy of water flow input to a pump water wheel 10 is regenerated by regenerating an exciting converter at the time of shutting OFF a load at the time of generating until guide vanes are fully closed, and an increase in the number of revolutions of an AC excited synchronous machine 100 is suppressed. When the present number of revolutions is abruptly changed to required input/output of a power system, power abrupt change rate is so calculated by an input/output rate setter as to fall within an allowable variable speed operating range, and the machine 10 deals with instantaneous input and output increase/decrease command.