| 摘要 |
PROBLEM TO BE SOLVED: To enable safe and certain runback drive in a thermal power plant controlled by a boiler-turbine cooperative control system. SOLUTION: Output of a load setter is so planned as to serve as a runback target load command also at the time of runback by having the load setter follow the output of a runback fall rate setter. As a result, since the load setter maintains the runback target load command value as it is even after resetting the runback, a stability of the drive can be improved at the time of transition to the boiler-turbine cooperative control. Furthermore, controlled variables such as main steam pressure and drum level are changed not excessively at the time of the runback by the parallel control with a fall rate different from that of the boiler by separating the target load command into a boiler input amount control command and a turbine control valve aperture control command for providing a change rate limitter also in the turbine control valve aperture control command. COPYRIGHT: (C)2008,JPO&INPIT
|
