Title:
WATER LEVEL ADJUSTING METHOD FOR HYDRAULIC POWER PLANT
Document Type and Number:
Japanese Patent JPH0363803
Kind Code:
A
Abstract:
PURPOSE:To prevent the hunting of water level and output occurring by measuring a time until the level reaches a prescribed level after the level enters a blind sector, outputting a controlled variable opposite to that in control when the level enters the blind sector in the control variable inversely proportional to the size of the time, and adjusting the level within the blind sector. CONSTITUTION:An in-blind sector control circuit 3 is operated when the level (a) is controlled with a PID arithmetic circuit 1 and a deviation proportional control circuit 2 and enters the blind sector. The control variable inversely proportional to the time (t) can be obtained in such a way that it is increased when the time (t) that the level reaches a preset level L0 from the upper limit level L1 or the lower limit level L2 of the blind sector is small, and it is decreased when the time (t) is large, and also, control output D0 opposite to that at a time when the level enters the blind sector is outputted. A MAX value and a MIN value are set for the control variable, and the control variable is decided with the internal arithmetic operation of the blind sector control circuit 3. In such a way, it is possible to prevent the hunting of the level and the output in the control of a generator occurring.
Inventors:
MOCHIZUKI TADASHI
Application Number:
JP20081789A
Publication Date:
March 19, 1991
Filing Date:
August 02, 1989
Export Citation:
Assignee:
MEIDENSHA ELECTRIC MFG CO LTD
International Classes:
G05D9/12; (IPC1-7): G05D9/12
Attorney, Agent or Firm:
Fujiya Shiga (2 outside)