Abstract of
JP9331699
PROBLEM TO BE SOLVED: To stabilize the system voltage by switching a voltage detecting calculating route and the gain of a voltage controller according to the magnitude of the reverse phase of the system voltage and improving the voltage controllability at the time of normal system. SOLUTION: A positive phase voltage detector 81 using discrete Fourier transformation and an instantaneous voltage detector 82 are operated in parallel. A switching unit 84 switches the output of the voltage detector according to a switching signal output from a switching signal generator 83 by the increase in the reverse phase of the system voltage, and the gain of an AVR is switched by the switching signal. The response of the voltage control at the time of small reverse phase is improved in addition to the stable control at the time of large reverse phase of the system voltage.
