CONTROLLER FOR VARIABLE-SPEED HYDRAULIC TURBINE GENERATOR

摘要

PURPOSE:To improve the stability of an AC system by directly controlling a generating output in response to a generating output command from the outside. CONSTITUTION:A rotational-speed command arithmetic section 15 outputs an optimum revolution-number command Na in response to an external generating output command P0 and a water-level signal H. A rotational speed controller 16 compares the optimum revolution-number command Na with a rotational speed signal N, and outputs a guide-valve opening command Ya to a guide valve 11 for a hydraulic turbine 2. A frequency controller 3 controls the phase of AC exciting current fed to a secondary winding 1b for a winding type induction motor 1 in response to the external generating output command P0, a slip-phase signal SP and a generating output P. Accordingly, the generating output can be followed up smoothly to the generating output command, thus improving the stability of an AC system.