GENERATING CONTROL METHOD IN HYDRAULIC POWER PLANT

PURPOSE:To make generating operation maintainable so smoothly even if a watercourse quantity is below a turbine runner's rated flow, by detecting the decrease of the watercourse quantity through a lowering of a tank level, while automatically releasing a fixed quantity of load being preset in linkage with this tank level in order. CONSTITUTION:A lowering of a water level in an upper tank 2 stemming from a decrease of the quantity of watercourse Q is detected by a level detecting device 11 (M point) and a fixed quantity of a load X1 is released by a load control panel 10. With this, a governor immediately contacts the opening of a turbine guide vane, regulating the inflow rate and performing generating operation corresponding to the load, and the level of the upper tank 2 rises whereby a constant head H can be maintained. In addition, when it becomes such generating capacity as below the load of (P-X1) as the quantity of watercourse decreases, the fixed quantity of the load X1 is immediately released by way of the above phenomena and motions alike and the level of the upper tank 2 is restored to the former constant head H again. Upon repetitions of these processes, generating operation corresponding to the decrease of the quantity of watercourse can be maintained.