Title:
CONTROLLER FOR FEEDWATER FLOW RATE
Document Type and Number:
Japanese Patent JPH02183815
Kind Code:
A
Abstract:
PURPOSE:To suppress the level fluctuation of a container by integrating the deviation signal between the container level and the set level value via an integrator having the increased input gain, applying the limitation of higher/lower limit levels to the integration output, and adding this output to a feedwater control valve opening amount request signal as a feedwater control valve opening amount correction signal. CONSTITUTION:A deviation signal 11 between the container level and the set level value is multiplied by a large input gain via a proportion unit 1 and then integrated by an integrator 2 for acquisition of a feedwater control valve opening amount correction signal 13 which actuates early a feedwater control valve 16 over the blind sector width of the valve 16 even with a minute level deviation. The signal 13 received from the integrator 2 is limited down to the small value by such an extent that never deteriorates the stability of the container level based on the upper/lower limit set value 3. Thus a feedwater control valve opening amount correction signal 14 is obtained and sent to an adder 6. Then the signal 14 is added to a feedwater control valve opening amount request signal 12 and sent to a feedwater control valve 15 to control this valve 15. Thus it is possible to suppress the undesired fluctuation of the container level in a normal operation state.
Inventors:
KIYOFUJI MITSUGI
Application Number:
JP274389A
Publication Date:
July 18, 1990
Filing Date:
January 11, 1989
Export Citation:
Assignee:
HITACHI LTD
HITACHI ENG CO LTD
HITACHI ENG CO LTD
International Classes:
G05D9/00; (IPC1-7): G05D9/00
Attorney, Agent or Firm:
Katsuo Ogawa (2 outside)
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