| 摘要 |
<p>PURPOSE:To prevent a synchronous machine from being stepped-out due to acceleration or deceleration, by performing correction control in addition to active power control, when primary side terminal voltage or primary side active- power is dropped to come to a fixed value or less. CONSTITUTION:When the primary side terminal voltage of an induction machine 1 which is detected by a voltage detector 10 is dropped to come to a fixed value or less on system trouble, then the output of correction command from a correction command generator 21 is generated from a power discriminating circuit 22. By a hold circuit 23, the correction command is held for a fixed time, and is added to the output signal of a speed controller 9 through an adder 24, and the input to a secondary current command setting circuit 14 is provided. By the correction command of output generated from the correction command generator 21, the rotational speed of the induction machine 1 is heightened when a synchronous machine in adjacent contact with the induction machine 1 is power-generation-operated, and the rotational speed of the induction machine 1 is lowered when the synchronous machine is pumpedstorage-operated.</p> |
