Variable speed generator-motor apparatus capable of improving accuracy of power system

摘要

A variable velocity generator-motor apparatus includes a wound rotor induction generator-motor having a primary winding connected to a power system, a secondary winding excited by an alternating current (AC) and a generator shaft; a prime-mover/load united with the generator shaft; a frequency detection element for detecting an AC excitation frequency on the basis of power data including a frequency and a voltage phase in the power system and data of the generator shaft; an element for generating a slip frequency command value in the generator-motor; and a frequency control element for controlling the generator-motor in the manner that the AC excitation frequency is set to the slip frequency command value.