Islanding detection device for synchronous generator with power system stabilizing function

摘要

PROBLEM TO BE SOLVED: To protect a synchronous generator by exactly detecting the independent operation of the synchronous generator in system linkage at the side of a generating set, and to improve the dynamic stability of a power system by excitation-controlling the synchronous generator.;SOLUTION: The independent operation detection device 1 comprises: a frequency detector 11 that detects a machine rotation frequency of the synchronous generator; a frequency variation amount operation part 12 that extracts a frequency error signal from the machine rotation frequency; a phase adjustment part 13 that oscillates a component of a specified natural frequency and converges a component of a natural frequency (local mode frequency) different from the component of the natural frequency; a frequency relay 14 that detects the frequency error signal has reached a prescribed value or higher; a proportional gain 15 that determines a code and the magnitude of a control signal to be output; an output limiter 16 that limits the magnitude of the control signal; and a timer 17 that measures a time elapsed from a state that the frequency error signal has reached the prescribed value or higher.;COPYRIGHT: (C)2007,JPO&INPIT