JP6576215B2 - Monitoring control device for water transmission facility plant and water level management method for distribution reservoir using monitoring control device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a monitoring control device for a water supply facility plant such as water supply and a water level management method for a distribution reservoir using the monitoring control device, and in particular, a change in the water level of a distribution reservoir that stores clean water is supplied to the distribution reservoir. A water supply equipment plant monitoring and control device that displays the water level of the distribution reservoir by predicting the water demand at each time with reference to the current water volume and the demand data at each past time In addition, the present invention relates to a water level management method for a distribution reservoir using a monitoring control device.

  Conventionally, in the monitoring and control system of the water supply facility plant, the water level of the water supply reservoir has been stably controlled by changing the amount of water used by consumers, including the majority of ordinary households, from moment to moment. Technology is not adopted, the operator who is resident in the water supply plant constantly monitors the water level of the reservoir, adjusts the flow rate with the water pump of the reservoir, and controls the water level, that is, the water level management standard in the reservoir Operation management is performed to prevent deviation from the upper and lower water levels. In this specific example of operation management, when the water level of the reservoir reaches the upper limit or the lower limit, the number of pumps operated is increased or decreased by the operator based on an alarm sent by the water level gauge. It may become.

  On the other hand, when the operator maintains the water level of the reservoir within the upper and lower limits, it is recorded as a technology to set the upper and lower limits of the reservoir that can suppress the generation of excessive pump power and prevent an increase in contract power. The plant data and water demand data are recorded in the section, and the simulation section uses the plant data to calculate the amount of water delivered to the reservoirs of multiple pumps, and based on the relationship between the amount of water delivered and the water demand data Calculate the water level of the reservoir, increase or decrease the number of pumps when this water level is near the upper and lower limits of the reservoir, calculate the amount of power and peak power based on the amount of water delivered, and then calculate the power based on this amount of power and peak power. An example is shown in which an amount charge is calculated and the upper and lower limits of the reservoir are set by the simulation unit to suppress the electricity amount charge (see, for example, Patent Document 1).

JP 2014-178816 A

  However, the technique disclosed in Patent Document 1 reads out the water demand data for a certain period in the past (for example, one year) from the database, obtains the water supply amount Qk as the water demand qk, and determines the water level Ik of the reservoir at time K. The water level Ik is calculated and maintained within a predetermined operational water level upper and lower limit range. Therefore, the water demand qk is based on reading from the database, and does not always match the water demand at the present time, which varies in various ways. There is a problem that driving may not be performed. In addition, the time when the water level of the reservoir reaches the upper limit or lower limit is not displayed, and in order to maintain a stable water level management operation so that it will not be a follow-up water level management operation such as after an alarm occurs, it is always monitored by the operator. There is a problem from the viewpoint of labor saving and energy saving.

  This invention was made in order to solve the problems as described above, and the prediction condition for calculating the water demand from the daily water demand actual value and the tap water supplied to the distribution reservoir at the present time. Based on the flow rate, the water level change chart is created and displayed by obtaining the predicted value of the water demand for each hour of the day that falls within the water level management standard of the reservoir, so the operator can change the water level of the reservoir in time. It is possible to recognize by unit, and it is possible to use the monitoring control device and monitoring control device of the water supply equipment plant that can prevent the occurrence of operation of management of the follow-up water level as well as save labor and energy, and enable efficient operation. The purpose is to provide a water level management method for a reservoir.

The first invention is
A monitoring and control device of a water supply facility plant that monitors and controls the water level of a distribution reservoir, a water supply pump that supplies clean water to the distribution reservoir, a flow meter that measures a water supply amount of the water supply pump, and a water level of the distribution reservoir When the forecast condition including the day of the week and the weather is input to the forecast condition input unit of the monitoring and control device, the water demand forecast unit goes back from the database to the forecast condition. The water demand amount actual values for a plurality of dates that match the above are obtained, and the water demand actual value is averaged to calculate the water demand amount predicted value for each time, and the water level calculation unit calculates the cross-sectional area of the reservoir. The water level at each time of the reservoir is calculated from the calculated predicted water demand, the water supply amount at the current time point indicated by the flow meter, and the water level indicated by the water level meter. Water level change line showing changes in water level A is, and in the vicinity of the upper limit water level control reference value of the distribution reservoir and lower limit level near control reference value, min, to create a change in water level diagram level change is indicated in seconds, the water level change diagram is displayed A plurality of operating state changes including the vicinity of the upper limit water level management reference value and the vicinity of the lower limit water level management reference value by an input from the water level management reference input unit of the monitoring and control device. A point is specified, and at the time corresponding to the operating state change point, the control unit of the monitoring control device controls to increase or decrease the discharge water amount of the water pump.
The second invention is
It is a water level management method of a distribution reservoir using the monitoring control apparatus of a water supply equipment plant provided with the following steps.
Step 1. The prediction condition including the day of the week and the weather is input to the prediction condition input section.
Step 2. Water demand prediction unit extracts case match multiple dates from a database in the prediction condition going back from that day.
Step 3. Based on the date extracted, the actual water demand is extracted from the database.
Step 4. The water demand amount actual value of the plurality of dates is averaged, and a water demand prediction value for each time is calculated.
Step 5. Enter the reservoir cross-sectional area into the water level calculator.
Step 6. The predicted water demand is input to the water level calculation unit.
Step 7. The water level calculation unit inputs the current water supply amount indicated by the flow meter and the water level indicated by the water level meter via the control bus.
Step 8. It is a water level change diagram showing the change in the water level over time, calculating the water level of the reservoir for each time from the predicted value of water demand, the amount of water delivered, the water level, and the cross-sectional area , and A water level change diagram showing the water level change in minutes and seconds near the upper limit water level management reference value and near the lower limit water level management reference value is created.
Step 9. A plurality of operation state change points including the vicinity of the upper limit water level management reference value and the vicinity of the lower limit water level management reference value and the change time of the operation state change point are input to the water level management reference input unit.
Step 10. The water level management reference input unit instructs the operation state change point and the change time of the operation state change point on the water level change diagram.
Step 11. The water level change diagram is displayed on the display unit.
Step 12. When the operating state change point time is reached, the control unit controls to increase or decrease the discharge water amount of the water pump.

Since the monitoring control device of the water transmission equipment plant according to the first invention adopts the above-described configuration, the predicted water demand amount calculated from the daily water demand actual value and the current distribution reservoir Based on the flow rate of the supplied water, a water level change diagram for each time is displayed, so it is possible to recognize the water level change in the distribution basin in units of time. The possibility of occurrence is reduced, and there is an effect that efficient plant operation can be performed together with labor saving and energy saving of operation.
Furthermore, the water level control method of distributing reservoir according to the second invention, changes time and changes in OPERATION state is instructed to level changes diagram, automatically suppresses the increase or decrease of the flow rate reaches the changes time Therefore, the same effect as described above is achieved.

It is a figure which shows the outline | summary of the water supply equipment plant by Embodiment 1. FIG. 1 is a block diagram illustrating a plant monitoring system including a monitoring control device according to Embodiment 1. FIG. It is a figure which shows the performance relevant data of the amount of water demand by Embodiment 1. FIG. FIG. 6 is a diagram illustrating a prediction condition according to the first embodiment. It is a figure which shows the water demand amount prediction result by Embodiment 1. FIG. It is a figure which shows the water level change diagram of the distribution reservoir by Embodiment 1. FIG. FIG. 3 is a diagram showing a flowchart according to the first embodiment. It is a figure which shows the water level change diagram by Embodiment 1. FIG. It is a figure which shows the water level change diagram by Embodiment 1. FIG. FIG. 10 is a diagram illustrating a flowchart according to the third embodiment.

Embodiment 1 FIG.
Hereinafter, a monitoring control device (hereinafter abbreviated as a monitoring control device) 10 for a water supply plant according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of a water supply equipment plant showing various facilities around a water reservoir 50 that supports the explanation of the operation of the monitoring and control apparatus 10. In FIG. 1, the water reservoir for sending clean water to a consumer 5 including a general household. 50, clean water from the upstream pond 51 is supplied from the water supply pump 1 having the discharge water amount Ex via the flow meter 2. The water level meter 3 installed in the distribution reservoir 50 measures the water level of the distribution reservoir 50 and outputs it to the information processing device 18 described later, and is provided with an upper limit water level management reference PH and a lower limit water level management reference PL corresponding to the water level management reference. , It has an alarm function to send each when the water level reaches it. The tap water of the distribution reservoir 50 is supplied to the customer 5 with the water demand predicted value Dr. This water demand predicted value Dr is not manageable and controllable by the monitoring control device 10 and changes from moment to moment depending on the amount of water consumed by the customer 5. That is, the monitoring control device 10 responds to the demand request of the customer 5 by constantly monitoring and controlling the current water level Po of the distribution reservoir 50.

FIG. 2 is a block diagram illustrating a configuration of a monitoring control system 100 for a water transmission facility plant including the monitoring control apparatus 10 according to the first embodiment. In FIG. 2, the monitoring control device 10 inputs and stores various plant databases of the equipment 19 such as the water pump 1, the flow meter 2, and the water level meter 3 shown in FIG. 1 via the information processing device 18 and the control bus 17. At the same time, the amount of water demand to be supplied to the customer 5 is predicted, and the water level of the reservoir 50 for each time is calculated.
The information processing apparatus 18 processes the output of the equipment 19 and measurement data information. The control bus 17 receives a command from the control unit 10a and transmits information and a control command bidirectionally with the information processing device 18 and the equipment 19.

  The monitoring control device 10 includes a database 11 that stores the actual water demand amount value via the control unit 10a and the control bus 17, a prediction condition input unit 12 that inputs a prediction condition including the day of the week and the weather, and the prediction condition. Based on the prediction condition input to the input unit 12, the water demand amount prediction unit 13 that obtains the water demand amount actual value from the database 11 and calculates the water demand amount prediction value for the day, and the water level of the distribution reservoir 50 The water level management standard input unit 14 for inputting the management standard, the water level calculation unit 15 for calculating the water level change of the distribution reservoir 50 for each time, and creating the water level change diagram, the water demand predicted value and the water level A display unit 16 for displaying a change diagram is provided.

Next, operation | movement and detailed structure of the monitoring control apparatus 10 are demonstrated based on FIGS.
In step (hereinafter abbreviated as ST) 1 of the flowchart shown in FIG. 7, as shown in FIG. 4, by the operator, the day of the day, forecast weather, time unit of past water demand actual value, number of searches, number of extraction days are A prediction condition 12 a that is “3” (three days) is input to the prediction condition input unit 12.
In ST2, the water demand forecasting unit 13 stores the past date, day of the week, climate, temperature, special day, and each time over 24 hours as shown in FIG. 3 stored in the database 11 (in this example, the forecast of FIG. 4). By referring to the water demand related data 11a (data every 6 hours under the condition 12a), the water demand related data 11a on the date almost matching the prediction condition 12a is extracted by going back from the most recent date. In this example, as shown in FIG. 5, the date of August 5, August 4, and August 2 is extracted.
In ST3, the water demand amount prediction unit 13 acquires the water demand amount actual value on the extracted date as shown in the water demand amount prediction result 13a in FIG.
In ST4, the water demand amount prediction unit 13 calculates the water demand amount prediction value Dr for each time of the day as shown in FIG.
In ST5, the cross-sectional area S of the reservoir 50 is input to the water level management reference input unit 14 by the operator.
In ST6, the water level calculation unit 15 inputs the predicted water demand value Dr calculated in ST4.
In ST7, the water level calculation unit 15 inputs the current flow rate Xo indicated by the flow meter 2 and the current water level Po of the distribution reservoir 50 indicated by the water level meter 3 via the control bus 17.
In ST8, the water level calculation unit 15 calculates the water level Pi of the distributing reservoir 50 at each time from the water demand predicted value Dr, the flow rate Xo, the water level Po, and the cross-sectional area S by the following equation.
Pi = ((Xo−Dr) / S) + Po
A water level change diagram Pf connecting the water levels Pi at each obtained time (every 6 hours in this example) is created. This water level change diagram Pf is shown in FIG.
In ST9, the water demand predicted value Dr and the water level change diagram Pf for each time of the day are displayed on the display unit 16.

  The discharge water amount Ex of the water pump 1 shown in FIG. 6 is equivalent to the flow rate Xo indicated by the flow meter 2, and the discharge water amount Ex changes with time corresponding to the predicted water demand amount Dr. The number of operating water pumps 1 and the valve opening degree not shown are controlled.

Furthermore, the water level Pi at each time calculated in ST8 uses the upper limit water level management standard PH and the lower limit water level management standard PL of the distribution reservoir 50 shown in FIG.
PL ≦ Pi ≦ PH
In the first embodiment, monitoring and control are performed by the operator so as to be within the range.

The change in the water level Pi at each time shown in FIG. 6 is based on the actual value of the coarse time scale every 6 hours such as 24:00, 6 o'clock, 12 o'clock, etc. of the water demand related data 11a in FIG. 5, the water demand forecast value Dr on the day as shown in FIG. 5 is adopted, but since the water demand actual value for each minute time (minute, second unit) is stored in the database 11, The maximum value of the water level change diagram Pf shown in FIG. 6, that is, a value near the upper limit water level management reference PH, and the value near 10:00 to 20:00, and the minimum value of the water level change diagram Pf, that is, a value near the lower limit water level management reference PL. for around 1:30 o'clock 24, for example, to get the water demand actual value of every 10 minutes, the procedure and operation of ST6~ST9 mentioned above, the water level calculation unit 15 shown in FIG. 8, FIG. 9 Water level Pi1-Pi7 and water level Pi11- It is also possible to create a water level variation diagram Pf connecting i16, FIG. 8, the water level varies diagram Pf shown in FIG. 9 is displayed in addition to the display unit 16. Moreover, it is good also as the water level change diagram Pf which uses the water demand amount actual value not only for every hour but for every hour and as the data for every 10 minutes, and using these together.

  The operating state change points Pct and Pcb and the change point times Tct and Tcb shown in FIG. 6 will be described in detail later.

  As described above, in the first embodiment, the change in the water level of the distribution reservoir 50 is calculated by averaging the flow rate Xo at the current time point supplied and the actual water demand amount values in the past similar to the weather conditions of the day. Based on the obtained water demand prediction results for each time, the water level change diagram Pf of the reservoir 50 for each time is calculated and displayed on the display unit 16, so that the operator can set the water level meter 3 to the upper limit of the water level, It is possible to recognize in advance in advance the alarm occurrence time to be transmitted at the lower limit, and the water level management of the distribution reservoir 50 is not a follow-up process as in the past, and the management system of the water level of the distribution reservoir 50 is prepared before the alarm occurrence and the water level Can be kept within the standard, and stable supply of drinking water to consumers is possible. In addition, since the water level change can be calculated and displayed in units of hours, minutes, etc., there is an effect that labor saving and labor saving of the operator and efficiency of monitoring and control of the plant operation can be achieved. When the water level Po of the distribution reservoir 50 reaches the upper and lower limit water level management standards PH and PL for some reason, the water level meter 3 generates an alarm.

Embodiment 2. FIG.
Next, a second embodiment will be described. The prediction condition 12a input to the prediction condition input unit 12 in the first embodiment described above is to extract weekday data with the extraction days being “3” from the database 11 as water demand related data. The prediction condition 12a according to the second embodiment is a special day of August 3 as shown in FIG. 3 instead of the weekday. The special day is, for example, a day when an event (event) or the like is performed in the customer 5 and the actual amount of water demand changes significantly compared to weekdays. When the operator recognizes that the day corresponds to a special day, the prediction condition 12a is set to one day of the special day with reference to the related data stored in the database 11, and the water demand forecasting unit 13 sets the day of the special day. The water demand amount actual value for each time is acquired and used as the water demand prediction value Dr, and the same operation as that of the first embodiment described above is performed thereafter. As a result, the same effects as in the first embodiment can be obtained even on a special day.

Embodiment 3 FIG.
Next, Embodiment 3 will be described. In the first and second embodiments described above, the water level of the reservoir 50 is managed by the operator based on the data displayed on the display unit 16 of the monitoring and control device 10, but this third embodiment is a monitoring method. This is a case where automatic operation control is performed by the control device 10 so as to keep the water level of the distribution reservoir 50 within the standard. Since the configuration of the monitoring control apparatus 10 is the same as that of FIG. 2 shown in the first embodiment, the description thereof is omitted, and a flowchart of the operation is shown in FIG.
In FIG. 10, ST1 to ST8 are the same as those in FIG.
In ST9, the operating level change points Pct, Pcb and the change point times Tct, Tcb are input to the water level management reference input unit 14 by the operator in the water level change diagram Pf shown in FIG. Here, the Pct is, for example, the operating state change point at which the water level of the distribution reservoir 50 shows the maximum value, and Tct is the change point time (20 o'clock). Pcb is an operating state change point at which the water level of the distributing reservoir 50 shows a minimum value, and Tcb is the change point time (1 o'clock).
In ST10, Pct, Pcb and Tct, Tcb input and instructed in ST9 are instructed in the water level change diagram Pf in FIG.
In ST11, the water level change diagram Pf by ST10 is displayed on the display unit 16.
In ST12, when the change point time Tct (20 o'clock) of the generation of the operation state change point Pct is reached, the control unit 10a decreases the flow rate Xo by reducing the number of water pumps 1 operated or the pump discharge water amount. A control command is issued. Further, when the change point time Tcb (1 o'clock) of occurrence of the operation state change point Pcb is reached, the control unit 10a performs a control command to increase the flow rate Xo due to an increase in the number of operating water pumps 1 or an increase in the amount of pump discharge water. To emit.

  In the above description, the operator selects and inputs Tct as the change point time and the two points of the water level change diagram Pf indicating the maximum value of the water level and Tcb indicating the minimum value of the water level. Instead of the above-mentioned locations, the locations required for plant monitoring control may be selected and input, and the sentence and input locations may be a plurality of locations instead of two.

  As described above, in the third embodiment, since the operation state change point is selected and input based on the obtained water level change diagram Pf, automatic operation control is performed when the time of the operation state change point is reached. This makes it possible to control the increase and decrease in the discharge water amount Ex from the water pump 1, achieve labor saving and labor saving, and the operating state change time is displayed on the display unit 16, so that information among operators is shared. Therefore, efficient monitoring and control of the water supply equipment plant becomes possible.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

1 water pump, 2 flow meter, 3 water level meter, 5 customer, 10 monitoring and control device,
10a control unit, 11 database, 11a water demand related data,
12 prediction condition input unit, 12a prediction condition, 13 water demand prediction unit,
13a Water demand forecast result, 14 Water level management standard input part, 15 Water level calculation part,
16 Display, 19 Equipment, 50 Reservoir, Po Current water level,
Xo Current flow rate, Dr water demand forecast value, PH upper water level management standard,
Pf water level change diagram, PL lower limit water level management standard, Ex pump discharge water volume,
Pct, Pcb Operating state change point, Tct, Tcb change point time.

Claims (2)

A monitoring and control device of a water supply facility plant that monitors and controls the water level of a distribution reservoir, a water supply pump that supplies clean water to the distribution reservoir, a flow meter that measures a water supply amount of the water supply pump, and a water level of the distribution reservoir When the forecast condition including the day of the week and the weather is input to the forecast condition input unit of the monitoring and control device, the water demand forecast unit goes back from the database to the forecast condition. The water demand amount actual values for a plurality of dates that match the above are obtained, and the water demand actual value is averaged to calculate the water demand amount predicted value for each time, and the water level calculation unit calculates the cross-sectional area of the reservoir. The water level at each time of the reservoir is calculated from the calculated predicted water demand, the water supply amount at the current time point indicated by the flow meter, and the water level indicated by the water level meter. Water level change line showing changes in water level A is, and in the vicinity of the upper limit water level control reference value of the distribution reservoir and lower limit level near control reference value, min, to create a change in water level diagram level change is indicated in seconds, the water level change diagram is displayed A plurality of operating state changes including the vicinity of the upper limit water level management reference value and the vicinity of the lower limit water level management reference value by an input from the water level management reference input unit of the monitoring and control device. A monitoring control device for a water supply facility plant, in which a point is indicated and at the time corresponding to the operating state change point, the control unit of the monitoring control device controls to increase or decrease the discharge water amount of the water pump. A water level management method for a distribution reservoir using a monitoring and control device of a water transmission facility plant comprising the following steps.
Step 1. The prediction condition including the day of the week and the weather is input to the prediction condition input section.
Step 2. Water demand prediction unit extracts case match multiple dates from a database in the prediction condition going back from that day.
Step 3. Based on the date extracted, the actual water demand is extracted from the database.
Step 4. The water demand amount actual value of the plurality of dates is averaged, and a water demand prediction value for each time is calculated.
Step 5. Enter the reservoir cross-sectional area into the water level calculator.
Step 6. The predicted water demand is input to the water level calculation unit.
Step 7. The water level calculation unit inputs the current water supply amount indicated by the flow meter and the water level indicated by the water level meter via the control bus.
Step 8. It is a water level change diagram showing the change in the water level over time, calculating the water level of the reservoir for each time from the predicted value of water demand, the amount of water delivered, the water level, and the cross-sectional area , and A water level change diagram showing the water level change in minutes and seconds near the upper limit water level management reference value and near the lower limit water level management reference value is created.
Step 9. A plurality of operation state change points including the vicinity of the upper limit water level management reference value and the vicinity of the lower limit water level management reference value and the change time of the operation state change point are input to the water level management reference input unit.
Step 10. The water level management reference input unit instructs the operation state change point and the change time of the operation state change point on the water level change diagram.
Step 11. The water level change diagram is displayed on the display unit.
Step 12. When the operating state change point time is reached, the control unit controls to increase or decrease the discharge water amount of the water pump.

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