SWITCHING METHOD EXTRACTION CONTROL PREFERENCE BETWEEN SPEED/LOAD CONTROL PREFERENCE IN EXTRACTION TURBINE

摘要

PURPOSE: To provide a preference control switching method which prevents occurrence of abrupt fluctuation of a valve opening of a turbine control valve in the case that extraction control preference and load or speed control preference is switched in an extraction turbine. ;CONSTITUTION: Provided are a load or speed preference limiter 10 and an extraction preference limiter 11. In the case of load or speed control preference, an extraction control computer 12 performs tracking of an output of the load or the speed preference limiter 10. In the case of extraction control preference, a speed and load constant control computer 13 performs tracking of an output of the extraction preference limiter 11. By switching the preference for controlling at the time of limit operation, occurrence of abrupt fluctuation is prevented at a valve opening of a turbine control valve.;COPYRIGHT: (C)1995,JPO