Control system for high-efficiency operation of generating units in hydroelectric power stations

Claim 2

The control system of claim 1; further comprising a plural number of automatic control means (35, 36, 37) that starts operation of each generating unit (5, 6 or 7) on the basis of start command signals output from said selection processing means (34) to start each generating unit (5, 6 or 7), and stops operation of each generating unit (5, 6 or 7) on the basis of stop command signals output from said selection processing means (34) to stop each generating unit (5, 6 or 7).

Claim 3

The control system of claim 2; further comprising a power objective value calculation means (38, 39, 40) provided to each generating unit (5, 6 or 7), to calculate a value of power most efficiently generated by that generating unit (5, 6 or 7) on the basis of flow amount objective value signals output as the result of calculation from said selection processing means (34); a deviation calculation means (41, 42 43) that has each of the power objective value signals sent from said power objective value calculation means (38, 39, 40) as the positive input, and the actual power signals output from said automatic control apparatus as the negative input, and that calculates a deviation of both signals; wherein calculation results of said deviation calculation means (41, 42 43) are sent to an automatic control means (35, 36, 37) of each generating unit as power deviation signals.

Claim 4

The control system of claim 1, wherein at least one of the plural number of generating units provided at said hydroelectric power station is a small-capacity generating unit (7) that generates a small capacity of power corresponding to a water amount ensuring the discharge of a constant of water supplied to amount of water for a demand from a downstream power station, and the remaining large-capacity generating units (5, 6) generate a large-capacity power when a supplied water amount is sufficient.

Claim 5

The control system of claim 4, wherein said plural number of large-capacity generating units (5, 6) comprises a first generating unit (5) and a second generating unit (6).

Claim 6

The control system of claim 4, wherein said selection processing means (34) is configured from a first comparison means (51) that uses detection signals (S₁₄) of a water level detector (27) that detects a water level of said head tank (4) as the basis for comparing a lower limit reference value indicating a lower limit water level of said head tank (4) and said detection signals (S₁₄); a second comparator (52) that compares an upper limit reference value that indicates an upper water level of said head tank (4) with said detection signals (S₁₄); a water level correction means (53) that corrects detection signals (S₁₄) by adding the degree of change when the head tank (4) water level indicated by said detection signals (S₁₄) has changed over the years to a water level different from that initially; a high-efficiency distribution water amount calculation processing means (54) to which are input flow amount signals supplied from said flow characteristic calculation means (34) and that indicated the flow amount from said water intake, a plural number of failure diagnosis signals supplied from said automatic control means, and comparison result signals of said first comparator (51), and which outputs distribution flow signals for each generating unit; third, fourth and fifth comparators (63, 64, 65) that compare whether or not distribution water amount signals for the generating units are greater than non-load flow amounts for the generating units; first, second and third timers (55, 56, 57) to which are input the detection signals indicating that the head tank water level exceeds an upper limit value as the result of comparison by said second comparator (52), and distribution water amount signals for each generating unit and which are output by said third, fourth and fifth comparators (63, 64 65), and which output start command signals to each automatic control means (35, 36 37) of each generating unit after the elapse of a set time; first, second and third switches (58, 60, 66) that switch on when there is correction of the water level on the basis of correction water level signals from said water level correction means and distribution flow amount signals for each said generating unit; and first and second adders (59, 61) that output said flow amount objective value signals to each automatic control means (35, 36) of the first and second generating units (5, 6) when said switches are on.

Claim 7

The control system of claim 1; further comprising a priority operation control means (70) that successively switches a generating unit (5, or 6) that is in solitary operation when a certain time is reached, so that there is not excessive operation of one particular generating unit (5, or 6) when there is solitary operation of one generating unit (5 or 6) out of said plural number of generating units (5, or 6).

Claim 8

The control system of claim 7; wherein said priority operation control means (70) is provided inside a high efficiency operation control system for a hydroelectric power station which is provided with at least one small-capacity generating unit (7) that generates a small capacity of power corresponding to a water amount ensuringthe discharge of a constant amount of water and a plural number of large-capacity generating units (5, 6).

Claim 9

The control system of claim 8, wherein said plural number of large-capacity generating units (5, 6) comprises a first generating unit (5) and a second generating unit (6).

Claim 10

The control system of claim 9, wherein said priority operation control means (70) is configured from a first AND circuit (71) to which are input first generating unit (5) parallel signals indicating that there is parallel operation of a first generating unit (5), inverted signals of second generating unit (6) parallel signals that indicate that there is parallel operation of a second generating unit (6), and to which are output first generating unit (5) solitary operation signals when only a first generating unit (5) is operating; a second AND circuit (72) to which are input second generating unit (6) parallel signals indicating that there is parallel operation of a second generating unit (6), inverted signals of first generating unit (5) parallel signals that indicate that there is parallel operation of a first generating unit (5), and to which are output second generating unit (6) solitary operation signals when only a second generating unit (6) is operating; a timer (75) that counts the time until the output of a switching signal at a constant cycle of at least half a year; a first integration means (73) that, on the basis of said switching signals from said timer (75) and said first generating unit (5) solitary operation signals, integrates the time that said first generating unit (5) has been in solitary operation; and a second integration means (74) that, on the basis of said switching signals from said timer (75) and said second generating unit solitary operation signals, integrates the time that said second generating unit has been in solitary operation.

Claim 11

The control system of claim 10, wherein said first and second integration means (73, 74) have a function so that even when the time (75) of said constant cycle set by said timer has still not been counter, the input of clear signals that indicate that the solitary operation time of that generating unit has exceeded the switching necessary time switches a generating unit on the other side and that is to have solitary operation.