JP2730188B2 - Water pump predictive operation controller - Google Patents

Description

The present invention relates to a water pump predictive operation control device for controlling the operation of a water pump based on a demand prediction in a water purification plant or the like.

B. Summary of the Invention In the present invention, in the operation of the reservoir and the operation of the water pump based on the demand forecast, the demand water amount for a predetermined time is calculated at an arbitrary time, and the number of water pumps to be operated for storage is planned. By operating the water pump based on the plan, the proper operation of the water pump and the appropriate water storage based on this will be obtained.

C. Conventional technology The water level of the reservoir changes depending on the difference between the demand and the amount of water supply.
It can be greatly changed. In addition, various proposals have been made for operation control means for reducing the frequency of operation switching of the water pump. Although these operating means have various advantages, on the other hand, there are various problems as described later, and there is no operation means of the distribution reservoir that solves all these problems, and it is necessary to meet the situation and purpose of each facility. At present, one condition is satisfied, but the other is performed at the expense of characteristics.

D. Problems to be Solved by the Invention As described above, the method of operating the water level constant near the upper limit of the reservoir is advantageous for dealing with abnormal situations such as power outages and deterioration of purified water quality. The cost increases, and the frequency of starting and stopping the pump increases. On the other hand, if it is kept constant near the lower limit, the water supply power cost will be small, but the water storage amount will be small, and it is uneasy to prepare for an abnormal situation. In addition, if the operation of switching the frequency of the water pump is performed less frequently, the water level in the reservoir will fluctuate greatly and the water level will decrease during peak demand, which may hinder stable supply in response to changes in demand. is there.

The present invention has been made to solve the above-mentioned problems, and its object is to predict a demand water amount, accumulate a demand amount for a predetermined time earlier than a predetermined time, and store water equal to or more than the accumulated water amount. Accordingly, it is an object of the present invention to provide a water pump predictive operation control device capable of improving the operation efficiency of the water pump and stably storing water.

E. Means for Solving the Problems In order to achieve the above object, the present invention integrates the demand water amount for a predetermined time earlier than this time at a predetermined time, and based on the calculation result, stores water for water storage. A water supply pump predictive operation control device is constituted by a calculation means for planning a water supply pump operation and a control means for switching the number of water supply pumps operated according to the operation plan of the calculation means.

F. Action When storing water in reservoirs, it is desirable to raise the water level as much as possible during times of increasing demand, and to operate at low water levels during times of low demand, such as at night. Therefore, the daily demand water amount is predicted using a computer, the demand amount for a certain time after a certain time is integrated, and the water amount equal to or more than this water amount is stored. Therefore, the target water level changes with time. In addition, the storage time has a function that can be set freely according to the characteristics of the facility and the operation policy.

G. Embodiment An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a configuration of a water pump predictive operation control apparatus according to an embodiment of the present invention, wherein 1 is an operator station for monitoring operation, 2 is a computer for operation management, 3 is a data artery, and 4a to 4d are data conversion. 5a to 5d are local area networks, 6a to 6d are programmable controllers, 7a to 7c are auxiliary relay boards, 8 is a pump station, 9 is a chemical injection facility, and 10 is a sedimentation basin.

In the first apparatus, the operator monitors the status of the pumping station 8, the chemical injection equipment 9, and the sedimentation basin 10 on the display unit (CRT) at the monitoring operation operator station 1, and performs a predetermined control operation. . The computer 2 executes a predetermined arithmetic control according to the state of each controlled place. That is, the operation status of the water supply pump in the pump station 1, the status of the chemical injection equipment 9, and the status of the sedimentation basin 10 are determined by the auxiliary relay panels 7a to
c, program controllers 6b-6d, networks 5b-5d,
The notification is sent to the operator station 1 and the computer 2 via the data converters 4b to 4d and the data artery 3. The computer 2 stores information on each controlled station and the operator station 1
The arithmetic processing is executed in response to an instruction from the CPU, and the arithmetic instruction is transmitted to the data artery 3, the data converters 4b to 4d and the network.
Program controllers 6b-6d via 5b-5d respectively
Lead to. The program controllers 6b to 6d execute a predetermined control operation in response to a command from the computer 2, and control each controlled site via the auxiliary relay boards 7a to 7c.

The present invention is characterized by control of a pumping station, and as an embodiment thereof, the K hour storage amount QMi at the time i is expressed by the following equation using the predicted demand amount QDi.

FIG. 3 shows an example where K = 6. The upper part of FIG. 3 shows a time-series change in the amount of water supplied by the pump and the predicted demand, and the lower part shows a change in the water level of the reservoir at that time. The hatched portion indicates the stored amount for 6 hours at 8:00. The water level for maintaining this storage amount is HJi = QMi / A (2), where A is the cross-sectional area of the reservoir. When this is calculated for one day (24 times if the calculation is performed once an hour), the water level is 6 in FIG.
It looks like a curve of time storage. Then, this is set as the lower limit water level, and the upper limit water level is set to be higher than the highest water level of the lower limit water level. For example, the height was increased by 0.5 m and kept constant throughout the day. If the water level changes between the upper and lower water levels, the previous number of pumps operated is maintained. The plan is decided. These procedures are as shown in FIG. 2, and are executed by the computer 2.

That is, as shown in FIG. 2, demand prediction (time-series prediction) is performed in step S1, and then initial data is input (step S2). After inputting the initial data, the storage time water level is calculated in step S3, thereby setting the upper limit water level (step S4). After the setting of the upper limit water level, the number of operating initial water pumps is calculated (step S5), and based on this, the discharge amount calculation value of the water pump is calculated (step S6). The water level of the reservoir is calculated based on the calculated value of the discharge amount of the water pump (step S7), and it is determined whether the calculated water level is within the range of the upper and lower water levels (step S8). If not, the number of pumps operated is changed (step S9), and the operations of steps S6 to S8 are repeated. If it is determined in step S8 that the water level is within the water level, the calculation for one day is terminated (step S8).
S10) A water pump operation plan is set (step S11), and the control device is operated (step S12). Thus, while controlling the operation of the controller or water pump, the operator station centrally monitors the process data.

H. Effects of the InventionThe present invention is as described above, by determining the lower limit water level of a reservoir or the like from the storage amount based on the demand forecast,
It is possible to secure a storage amount corresponding to a change in daily demand and to supply water at an appropriate water level when the demand is small, so that the power cost of the pump can be reduced and the frequency of starting and stopping the pump can be reduced.

[Brief description of the drawings]

1 is a block diagram of a water pump predictive operation control device according to an embodiment of the present invention, FIG. 2 is an operation flow diagram of the device of FIG. 1, and FIG. 3 is a water pump predictive operation control according to an embodiment of the present invention. It is a time characteristic diagram of the flow rate and the water level by the device. 1 ... operator station for monitoring operation 2 ... computer for operation management 3 ... data artery 4a-4d ... signal converter 5a-5d ... local area network 6a
... 6d ... programmable controller, 7a-7c ... auxiliary relay panel, 8 ... pump station, 9 ... chemical injection equipment, 10 ...
… A sedimentation pond.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-58612 (JP, A) JP-A-52-20402 (JP, A) JP-A-51-35880 (JP, A) 61703 (JP, U)

Claims (1)

(57) [Claims] 1. A calculating means for integrating a demand water level for a predetermined time earlier than this time at a predetermined time and planning a water pump operation for storing water based on the calculation result; Control means for switching the number of water pumps to be operated according to an operation plan, wherein the calculating means is required to maintain a storage amount for a predetermined time, which is an integration of the predicted demand amount for the predetermined time at the predetermined time. Means for determining the water level of the reservoir and setting it to the lower limit water level at the predetermined time; and performing the prediction / calculation process a predetermined number of times to determine the lower water level at each predetermined time and to set the upper water level of the reservoir to the highest of the lower water level. Means for setting the water level higher than the water level, and maintaining the previous number of pumps operated according to the water level changing within the range of the upper limit water level and the lower limit water level, and reducing the number of pumps operated in the case of the upper limit water level Means for performing an operation plan by increasing the number of operating pumps in the case of the lower limit water level.