Hitachi, Ltd.

Junichi Hatakeyama

Kuniaki Matsumoto

Shinichiro Miyaoka

Masaharu Okamoto

System for controlling flow rate in pipelines connecting a plurality of reservoirs is disclosed. Flow rate Q.sub.ij (t) of fluid flowing from one reservoir (i) to another reservoir (j) is first calculated from the water levels H.sub.i (t), H.sub.j (t) of both reservoirs (i), (j) and then water level H.sub.j (t+1) of the reservoir (j) at the time (t+1) is calculated from its inflow and outflow taking into account the predicted amount of demand Q.sub.je (t). If the water level h.sub.j (t+1) is below or over the predetermined lower or upper limitation, manipulated variables for valves and pumps installed in pipelines are regulated to control inflow of the reservoir (j) so that the required fluid-feed is satisfied while maintaining the scheduled water level of the reservoir (j).

System for controlling flow rate in pipelines

A flood control system for a dam provides for measuring the actual water level of the dam and for calculating the deviation value between a set reference water level and the actual water level. Proportional-position control over the gate angle is then performed in response to the calculated water deviation level and means is provided for determining the outflow of water to be discharged from the dam in response to the value obtained by this control.

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Kokubunji, Japan

Junichi Hatakeyama