JP5010504B2 - Water distribution pressure optimum control device - Google Patents

Description

  The present invention is a distribution pressure optimal control in which purified water is pumped from a distribution pipe network of a water supply system via a pipeline from a distribution reservoir to a consumer at the end or by adjusting the pressure under natural flow. Relates to the device. Specifically, the present invention is capable of reducing the amount of water leakage and reducing pressure fluctuations by performing robust end pressure constant control even when daily demand fluctuations and distribution pipe network processes change over time. The present invention relates to a water distribution pressure optimum control device.

  Patent Document 1 maintains the service life of pumps and pipes in a distribution system that joins natural sewage and pumped pump water by suppressing sudden fluctuations in the distribution pressure without stopping the distribution pump below the basic distribution amount. A control device, a control method, and a control system are provided. Further, Patent Document 1 has a control determination unit that switches to either constant flow control or constant pressure control according to fluctuations in the water distribution amount, and when the pump is in constant pressure control, the decrease in the discharge flow rate has a predetermined duration. If it continues, switch to constant flow control, store the discharge pressure at this time, and when the pump discharge pressure continues for a predetermined duration than the pressure at the time of switching to constant flow control during constant flow control Switch to pressure control.

Patent document 2 relates to a terminal pressure control device for a distribution pipe network for optimally and automatically determining a terminal pressure (water pressure) in a water distribution pipe network. Patent Document 2 realizes a terminal pressure control device that can update data distribution pipes and respond to changes in demand without requiring updating and adjustment of data and control parameters.
JP 2006-330900 A JP 2001-92940 A

  Conventional terminal pressure constant control is generally performed by PID control with the pressure value at the end as the target value because fluctuations in demand caused by human life patterns become disturbances. There is a problem that the process changes due to aging and the PID control performance deteriorates.

Since patent document 1 aims at maintaining the lifetime of a pump and piping by switching flow control and pressure control, the problem which it is going to solve differs from this application.
In Patent Document 2, a schedule is set in advance for a change in demand, and the discharge pressure setting value is changed based on the schedule. In this case, it is necessary to adjust the schedule appropriately depending on the accuracy of demand prediction. is there.

  The present invention has been made in consideration of such circumstances, and in the distribution block (or closed pipe network) to be controlled, the inflow flow rate and discharge pressure, the terminal pressure, the actual process data of the demand amount, the pump characteristics, It is an object of the present invention to provide a water distribution pressure optimum control device capable of suppressing deterioration in control performance caused by demand fluctuations and secular changes in pipeline network processes based on a QH curve representing valve characteristics.

The distribution pressure optimum control device according to the present invention (the first invention) is a distribution pressure for pumping purified water from a distribution pond to a terminal consumer from a distribution network of a water supply system arranged via a pipeline. Optimum control device, discharge pressure measuring means installed at the inlet of the distribution pipeline network, flow rate measuring means installed at the inlet of the distribution pipeline network, and end pressure measurement installed at the end of the distribution pipeline network Means, discharge pressure control means for controlling the pump speed based on the discharge pressure target value, terminal pressure constant control means for controlling the discharge pressure based on the terminal pressure set value, and pump operation based on the discharge pressure target value Based on the pump number control means for calculating the number of units and the demand forecast value, the discharge pressure required to make the end pressure constant is calculated by the pump QH curve and the pipe resistance curve, and the end pressure control feed Forward signal The optimum discharge pressure planning means for force, discharge pressure measuring means and flow measuring means and the distal pressure measuring means, respectively from the resulting discharge pressure, a monitoring database for storing the data of the flow rate and the end pressure, past resulting from the monitoring database And a pipe resistance estimating means for generating a pipe resistance curve suitable for the current water distribution process based on the data of the discharge pressure, the flow rate and the terminal pressure .

Further, the water distribution pressure optimum control device according to the present invention (second invention) is the pressure of the purified water from the distribution pond via the pipe from the distribution pond to the end consumer by the valve under natural flow. Is a distribution pressure optimal control device for adjusting the water supply, and is installed at the inlet of the distribution pipe network and the secondary pressure measuring means for measuring the secondary pressure of the valve installed at the inlet of the distribution pipe network The flow rate measuring means, the terminal pressure measuring means installed at the end of the water distribution network, the pressure reducing control means for controlling the valve opening based on the pressure reducing amount, and calculating the pressure reducing amount based on the terminal pressure target value Based on the terminal pressure control means, the demand forecast value, the known discharge pressure value and the terminal pressure target value, the amount of pressure reduction required to keep the terminal pressure constant is calculated, and the feedforward signal for pressure reduction control is output. Optimal decompression amount planning means to perform, secondary A monitoring database that accumulates secondary pressure, flow, and terminal pressure data obtained from the pressure measuring means, flow rate measuring means, and terminal pressure measuring means, and past valve opening, pressure loss, and flow rate obtained from this monitoring database. And a pipe resistance estimating means for generating a pipe resistance curve suitable for the current water distribution process based on the terminal pressure data .

Furthermore, the water distribution pressure optimum control apparatus according to the present invention (third invention) pumps purified water from a distribution water reservoir via a pipeline from a distribution reservoir to a consumer at the end with a fixed speed pump. The fine adjustment of the pressure is a distribution pressure optimum control device for reducing the pressure by the adjustment valve and supplying the water. The secondary pressure measuring means for measuring the secondary pressure of the valve installed at the inlet of the distribution pipe network, Flow rate measuring means installed at the inlet of the water pipeline network, terminal pressure measuring means installed at the end of the water distribution network, pressure reducing control means for controlling the valve opening based on the amount of pressure reduction, and terminal pressure target value Based on the terminal pressure control means for calculating the pressure reduction amount based on the demand prediction value, the pressure reduction amount necessary for making the terminal pressure constant is calculated from the pipeline resistance curve, and the feedforward signal of the pressure reduction control is calculated. An optimum decompression amount planning means to output; 2 Monitoring database for storing secondary pressure, flow rate and terminal pressure data obtained from the secondary pressure measuring means, flow rate measuring means and terminal pressure measuring means, respectively, and past valve opening and pressure loss obtained from this monitoring database And a pipe resistance estimating means for generating a pipe resistance curve suitable for the current water distribution process based on the flow rate and terminal pressure data .

  According to the present invention, it is possible to suppress control performance deterioration caused by demand fluctuations or secular changes in the pipeline network process.

Hereinafter, the water distribution pressure optimum control device of the present invention will be described in more detail.
(1) The water distribution pressure optimum control device of the first invention is as described above.
(2) In the invention of (1) above, a monitoring database for accumulating discharge pressure, flow rate and terminal pressure data obtained from the discharge pressure measuring means, flow rate measuring means and terminal pressure measuring means, respectively, and a past obtained from this monitoring database Pipe resistance estimating means for generating a pipe resistance curve suitable for the current water distribution process based on the discharge pressure, flow rate, and terminal pressure data of the pipe, and the pipe resistance curve is obtained by the pipe resistance estimating means. Are preferred.
In this case, since there is a pipe resistance estimation means for generating a pipe resistance curve suitable for the current water distribution process based on the past discharge pressure, flow rate, and terminal pressure data obtained from the monitoring database, the fluctuation in demand and It is possible to further suppress the control performance deterioration caused by the aging of the pipeline network process.

  (3) In the inventions of (1) and (2) above, the optimum discharge pressure planning means is calculated by the demand prediction means based on the past flow actual value obtained by the flow measuring means and weather information such as weather and temperature. Preferably, it is a means for calculating a feedforward signal for terminal pressure control based on a demand pattern for one day in a time series. In this case, since different demand patterns can be predicted from the past results, the performance of the terminal pressure control can be further improved.

(4) In the above inventions (1) to (3), the discharge pressure target value (PO _{SV in} FIG. 1) can be set in advance by the operator, and the set pattern can be used as a feedforward signal. Thereby, control of the number of pumps suitable for an operator can be performed more simply.

  (5) In the above inventions (1) to (4), the gain of the discharge pressure change with respect to the rotational speed operation obtained based on the pipe resistance curve obtained by the pipe resistance estimating means and the pump QH curve is calculated. It is preferable to further include a PID control parameter adjusting means for readjusting the calculated gain as a discharge pressure control parameter when there is a deviation of a certain threshold value or more from the initial control parameter adjustment gain. Thereby, control of the terminal pressure of a water distribution pipe network can be performed more accurately.

  (6) In the inventions of the above (1) to (5), the pump rotational speed and the discharge pressure gain that change depending on the number of pumps operated are converted into a pipe resistance curve and a pump QH curve obtained by the pipe resistance estimating means. It is preferable to further include a PID control parameter adjusting unit that calculates based on the current number of operating units and re-adjusts the PID control parameter for appropriate discharge pressure control. Thereby, control of the terminal pressure of a water distribution pipe network can be performed more accurately.

Next, embodiments of the present invention will be described with reference to the drawings. Note that the present embodiment is not limited to the following description.
Example 1
Please refer to FIG. The water distribution pressure optimum control device according to the first embodiment is for pumping purified water from a distribution water reservoir via a pipeline to a consumer at the end from a distribution network via a pipeline.
As shown in FIG. 1, the water distribution pressure optimum control apparatus includes a first pressure gauge 1 as discharge pressure measuring means, a flow meter 2 as flow rate measuring means, and a second pressure gauge as terminal pressure measuring means. 3, discharge pressure control means 4, pump number control means 5, terminal pressure control means 6, demand prediction means 7, optimum discharge pressure planning means 8, monitoring database (DB) 9, and pipe resistance estimation Means 10 and PID control parameter adjustment means 11 are provided. In the figure, reference numeral 12 denotes a water distribution pipe network, reference numeral 13 denotes a water distribution pump provided in the pipe between the distribution reservoir 14 and the water distribution pipe network 12, and reference numeral 15 denotes a rotational speed control means. In FIG. 1, reference sign P1 _SV is a terminal pressure setting value, reference sign P0 _SV is a discharge pressure target value, reference sign P0 _mpc is an optimum discharge pressure value, reference sign N _SV is a rotation speed setting value, reference sign N _pv is a pump rotation speed, Symbol P0 _pv indicates the inlet pressure value of the distribution pipeline network, symbol Q _out indicates the inlet flow value of the distribution pipeline network, and P1 _pv indicates the terminal pressure value of the distribution pipeline network.

  The first pressure gauge 1 is installed at the inlet of the water distribution network 12 and measures the pressure at the inlet. The flow meter 2 is installed at the inlet of the water distribution pipe network 12 and measures the inflow flow rate at the inlet. The second pressure gauge 3 is installed at the end of the water distribution pipe network 12 and measures the pressure at the end. The discharge pressure control means 4 performs PID control on the pump rotation speed based on the discharge pressure target value. The number-of-pumps control means 5 calculates the number of operating pumps based on the discharge pressure target value. The terminal pressure control means 6 performs PID control of an appropriate discharge pressure based on the terminal pressure target value. The monitoring DB 9 accumulates and stores these measured values and calculated values in the DB.

The pipe resistance estimation means 10 calculates the pipe resistance curve of the actual process based on the discharge pressure, the terminal pressure, and the inflow rate accumulated in the monitoring DB 9. In other words, the estimated model of the discharge pressure and the terminal pressure is represented by the following equation, with the target distribution pipeline network equivalently regarded as one pipeline.
P1 = P0−RQ ^α + h (1)
Here, P1 is a terminal pressure [m], P0 is a discharge pressure [m], Q is a flow rate [m ³ / h], R is a pipe resistance constant, α is a flow rate multiplier, and h is a discharge pressure measurement point and a terminal pressure. Elevation difference [m] from the measurement point, and h = elevation at the discharge pressure measurement point−elevation at the end pressure measurement point.

  h is known by the structure of the process. Since R and α are different parameters depending on the distribution pipe network to be controlled, values are obtained from the measurement data of P1, P0, and Q using the least square method. That is, the pipe resistance estimation means 10 can estimate the pipe resistance from the discharge pressure measurement point to the end pressure measurement point based on the terminal pressure, discharge pressure, and flow rate data.

The demand prediction means 7 predicts the demand amount for one day in time series based on the past actual flow rate value accumulated in the monitoring DB 9 and weather information such as weather / temperature input from the operator. In the optimum discharge pressure planning means 8, the daily discharge pressure target is obtained based on the demand prediction value obtained by the demand prediction means and the pipe resistance curve obtained by the pump QH curve and the pipe resistance estimation means. The value is calculated and output as a feedforward signal (P0 _{mpc in} FIG. 1) of the terminal pressure control means 6. Specifically, in the pipe resistance curve (for example, (1) in FIG. 2), when the demand predicted value is about 600 m ³ / h, the pressure value of the pump QH curve that is the intersection is calculated. To do. In this case, the required discharge pressure is about 40 m. Further, when the flow rate value of the demand forecast value is about 400 m ³ / h, the required discharge pressure is about 35 m.

  In addition, the demand prediction means 7 predicts the demand amount for one day on the current day by the hour or the minute by using the past (distribution) flow history data and the weather and temperature on the operation day. By the way, as a demand prediction calculation method, fuzzy reasoning, a neural network, or the like is generally used, but the specific method is not particularly limited.

  The PID control parameter adjusting means 11 adjusts the PID control parameter based on the slope of the tangent to the pipe resistance curve that changes according to the current pump speed. The adjustment is also made based on the inclination of the tangent line that also changes with the passage of time in the pipe resistance curve. Specifically, this will be described with reference to FIG. However, in FIG. 2, the symbols a and b are curves showing the relationship between the flow rate and the pressure in the case of 90% and 100% operation when there is one pump, respectively. Symbols c and d are curves showing the relationship between the flow rate and pressure when the pumps are 90% and 100%, respectively. Reference numerals (1) and (2) indicate pipeline resistance curves, respectively.

  When the current pipe resistance curve (1) transitions to the pipe resistance curve (2) due to secular change, the gain of the discharge pressure change with respect to the rotation speed changes as shown by A and B in the figure. I understand that. That is, the PID control parameters set at the time of introduction indicate that the control performance is deteriorated. Therefore, the PID control parameter of the discharge pressure control is adjusted according to the gain change.

  Moreover, although the pipe line resistance curve remains (1), it can be seen that the gain of the change in the discharge pressure with respect to the change in the rotational speed also changes depending on the number of pumps operated (C in FIG. 2). That is, the PID control parameter adjusting means 11 adjusts the PID control parameter (particularly the proportional gain) of the discharge pressure control based on the secular change of the pipe resistance curve and the current value of the number of pumps being controlled. To do.

  As shown in FIG. 1, the water distribution pressure optimum control apparatus according to the first embodiment includes a first pressure gauge 1 as a discharge pressure measuring means, a flow meter 2 as a flow measuring means, and a terminal pressure measuring means. Second pressure gauge 3, discharge pressure control means 4, pump number control means 5, terminal pressure control means 6, demand prediction means 7, optimum discharge pressure planning means 8, monitoring DB 9, pipe resistance An estimation unit 10 and a PID control parameter adjustment unit 11 are provided.

  That is, in the first embodiment, in the distribution pipeline network 12 to be controlled, based on the inflow flow rate and discharge pressure, the terminal pressure, the actual process data of the demand amount, the QH curve representing the pump characteristics and the valve characteristics. In addition, it is possible to control the end pressure that can suppress the deterioration of the control performance caused by the demand fluctuation and the secular change of the pipeline network process.

(Example 2)
The distribution water pressure optimum control device according to the second embodiment is configured to supply purified water from a distribution pipe network of a water supply system via a pipeline from a distribution reservoir to a consumer at the end under a natural flow of the pressure by a valve (for example, a control valve). It is for adjusting and sending water.
In the case of natural flow, the discharge pressure is constant, and the terminal pressure changes according to the inflow flow rate and the regulating valve. Therefore, the relationship between the valve opening and the pressure loss is read based on the past performance data accumulated in the monitoring DB, and the line resistance curve is changed. Specifically, the following term is added to the right side of the pipeline resistance curve equation shown in equation (1).

P1 = P0−RQ ^α + h−fv (u) (2)
Where fv (u) represents the pressure loss due to the valve and is a function of the opening u,
fv (u) = K × (1 / u−1) ⁿ .
However, K and n are parameters identified based on past performance data accumulated in the monitoring DB.
In addition, since P0 is constant in the case of natural flow and h is also known, the opening degree u is set so as to be the terminal pressure set value when the flow rate Q of a certain demand predicted value is directly given from the equation (2). To control.

  According to the second embodiment, it is possible to control the terminal pressure capable of suppressing the deterioration of the control performance caused by the demand fluctuation and the secular change of the pipeline network process by the same function as described in the first embodiment.

  A fixed speed pump can be used instead of natural flow. In this case, the discharge pressure required when the flow rate of the demand prediction value is given is calculated based on the pipe resistance curve obtained by the above-described equation (2). In this case, it is assumed that a flow control valve (a valve for adjusting the flow rate) is set at the fixed speed pump outlet. In Example 1, it was possible to control by the number of revolutions, but in this case, the required flow rate was discharged by changing the pipe resistance curve according to the valve opening based on the QH curve that is different for each operating unit. (The discharge pressure value at the outlet of the flow control valve is the contact point between the demand forecast value and the pipeline resistance curve).

The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1] A distribution pressure optimum control device for pumping purified water from the distribution water network via the pipelines to the consumers at the end, installed at the entrance of the distribution pipeline network Discharge pressure measuring means, flow rate measuring means installed at the inlet of the distribution pipeline network, terminal pressure measurement means installed at the end of the distribution pipeline network, and the pump rotation speed based on the discharge pressure target value A discharge pressure control means for controlling, a terminal pressure constant control means for controlling the discharge pressure based on the terminal pressure set value, a pump number control means for calculating the number of pumps operated based on the discharge pressure target value, and a demand predicted value And an optimum discharge pressure planning means for calculating a discharge pressure necessary for making the end pressure constant based on a pump QH curve and a pipe resistance curve and outputting a feedforward signal of the end pressure control. That Distribution pressure optimal control apparatus according to symptoms.
[2] A monitoring database for storing discharge pressure, flow rate, and terminal pressure data obtained from the discharge pressure measuring means, flow rate measuring means, and terminal pressure measuring means, respectively, and a past discharge pressure, flow rate, and terminal pressure obtained from this monitoring database And a pipe resistance estimating means for generating a pipe resistance curve suitable for the current water distribution process based on the data, wherein the pipe resistance curve is obtained by the pipe resistance estimating means [ 1] The distribution pressure optimum control device according to [1].
[3] Optimized discharge pressure planning means comprising demand prediction means for predicting a demand amount for one day in time series based on past flow actual values obtained by the flow measurement means and weather information such as weather and temperature. The water supply pressure optimum control device according to [1] or [2], wherein the demand forecast value in the output of a feedforward signal of terminal pressure control is based on the demand forecast value pattern predicted by the demand forecasting means.
[4] The distribution pressure optimum control device according to [1] or [2], wherein an operator sets a discharge pressure target value in advance and uses the set pattern as a feedforward signal.
[5] The gain of the discharge pressure change with respect to the rotational speed operation obtained based on the pipe resistance curve obtained by the pipe resistance estimation means and the pump QH curve is calculated, and the calculated gain is used as a parameter for the discharge pressure control. The distribution pressure optimum control device according to any one of [1] to [4], further comprising PID control parameter adjustment means for readjustment.
[6] The pump rotation speed and the discharge pressure gain, which vary depending on the number of pumps operated, are calculated based on the pipe resistance curve obtained by the pipe resistance estimating means and the pump QH curve, and according to the current number of operating pumps. The water distribution pressure optimum control device according to any one of [1] to [4], further comprising PID control parameter adjustment means for readjusting PID control parameters for appropriate discharge pressure control.
[7] A water distribution pressure optimal control device for adjusting the pressure of a purified water by a valve under natural flow from a distribution water network of a water supply system arranged via a pipeline from a distribution reservoir to a consumer at a terminal end. Secondary pressure measuring means for measuring the secondary pressure of the valve installed at the inlet of the water distribution network, flow rate measuring means installed at the inlet of the water distribution network, and installed at the end of the water distribution network Terminal pressure measurement means, pressure reduction control means for controlling the valve opening based on the pressure reduction amount, terminal pressure control means for calculating the pressure reduction amount based on the terminal pressure target value, demand predicted value, known discharge pressure value And an optimum decompression amount planning means for calculating a decompression amount necessary for making the end pressure constant based on the end pressure target value and outputting a feedforward signal for decompression control. Pressure optimum control device.
[8] A monitoring database for storing secondary pressure, flow rate, and terminal pressure data obtained from the secondary pressure measuring means, flow rate measuring means, and terminal pressure measuring means, and past valve opening obtained from the monitoring database. Based on the pressure loss, flow rate, and terminal pressure data, the pipe resistance estimation means for generating a pipe resistance curve suitable for the current water distribution process and the pipe resistance curve obtained by the pipe resistance estimation means are obtained. A PID control parameter adjustment means for calculating a gain of a pressure reduction amount change with respect to a valve opening operation to be performed and re-adjusting the calculated gain as a parameter for pressure reduction amount control is provided. Control device.
[9] The purified water is pumped by a fixed-speed pump from the distribution water network of the water supply system arranged through the pipeline from the distribution reservoir to the end customer, and the fine adjustment of the pressure is performed by reducing the pressure by the adjusting valve. A distribution pressure optimum control device, a secondary pressure measuring means for measuring the secondary pressure of a valve installed at the inlet of the distribution pipe network, a flow measuring means installed at the inlet of the distribution pipe network, and the distribution pipe Terminal pressure measuring means installed at the end of the road network, pressure reducing control means for controlling the valve opening based on the amount of pressure reduction,
The terminal pressure control means for calculating the pressure reduction amount based on the terminal pressure target value, and the pressure reduction amount required to make the terminal pressure constant based on the demand prediction value are calculated from the pipe resistance curve. An optimum distribution pressure control device, comprising: an optimum decompression amount planning means for outputting a feedforward signal.
[10] A monitoring database for storing secondary pressure, flow rate, and terminal pressure data obtained from the secondary pressure measuring means, flow rate measuring means, and terminal pressure measuring means, and past valve opening obtained from the monitoring database. Based on the pressure loss, flow rate, and terminal pressure data, a pipe resistance estimation means for generating a pipe resistance curve suitable for the current water distribution process, a pipe resistance curve obtained by the pipe resistance estimation means, and a fixed speed pump PID control parameter adjusting means is provided for calculating a gain of change in pressure reduction with respect to the valve opening operation obtained based on the pump QH curve corresponding to the number of operating units, and readjusting the calculated gain as a parameter for pressure reduction control. [9] The water distribution pressure optimum control device according to [9].

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing of the distribution pressure optimal control apparatus which concerns on Example 1 of this invention. The characteristic view which shows a pump QH curve and a pipe line resistance curve.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... 1st pressure gauge (discharge pressure measuring means), 2 ... Flow meter (flow rate measuring means), 3 ... 2nd pressure gauge (terminal pressure measuring means), 4 ... Discharge pressure control means, 5 ... Number control of pumps Means 6: Terminal pressure control means 7 ... Demand prediction means 8 ... Optimal discharge pressure planning means 9 ... Monitoring database 10 ... Pipe resistance estimation means 11 ... PID control parameter adjusting means 12 ... Water distribution pipeline network , 13 ... water distribution pump, 15 ... rotational speed control means.

Claims (9)

It is a water distribution pressure optimal control device for pumping purified water from the distribution water network of the water supply system that is arranged through the pipeline from the distribution reservoir to the end customer.
A discharge pressure measuring means installed at the entrance of the water distribution network;
Flow rate measuring means installed at the entrance of the water distribution network;
End pressure measuring means installed at the end of the water distribution network;
A discharge pressure control means for controlling the pump rotation speed based on the discharge pressure target value;
A terminal pressure constant control means for controlling the discharge pressure based on the terminal pressure setting value;
A pump number control means for calculating the number of pumps operated based on the discharge pressure target value;
Optimal discharge pressure planning means for calculating the discharge pressure required to make the terminal pressure constant based on the demand predicted value by the pump QH curve and the pipe resistance curve and outputting a feedforward signal for terminal pressure control When,
A monitoring database for storing discharge pressure, flow rate and terminal pressure data obtained from the discharge pressure measuring means, flow rate measuring means and terminal pressure measuring means, respectively;
A pipe resistance estimating means for generating a pipe resistance curve suitable for the current water distribution process based on the data of the past discharge pressure, flow rate and terminal pressure obtained from this monitoring database;
A water distribution pressure optimum control device comprising: Based on the past actual flow rate value obtained by the flow rate measuring means and weather information such as weather and temperature, it comprises a demand prediction means for predicting the daily demand amount in time series, and the optimum discharge pressure planning means 2. The water distribution pressure optimum control device according to claim 1, wherein a feedforward signal for terminal pressure control is output based on the demand predicted value pattern predicted by the prediction means . The water distribution pressure optimum control device according to claim 1 or 2 , wherein an operator sets a discharge pressure target value in advance and uses the set pattern as a feedforward signal. The gain of the discharge pressure change with respect to the rotation speed operation obtained based on the pipe resistance curve obtained by the pipe resistance estimation means and the pump QH curve is calculated, and the calculated gain is readjusted as a parameter for the discharge pressure control. The distribution pressure optimum control device according to any one of claims 1 to 3, further comprising PID control parameter adjusting means. The gain of pump speed and discharge pressure, which varies depending on the number of pumps operating, is calculated based on the pipe resistance curve obtained by the pipe resistance estimation means and the pump QH curve, and appropriate discharge according to the current number of operating pumps. The water distribution pressure optimum control device according to any one of claims 1 to 3, further comprising PID control parameter adjustment means for readjusting a PID control parameter for pressure control. It is a distribution pressure optimal control device for adjusting the pressure by a valve under natural flow from the distribution pipe network of the water supply system arranged via the pipeline from the distribution reservoir to the consumer at the end.
A secondary pressure measuring means for measuring a secondary pressure of a valve installed at the inlet of the water distribution network;
Flow rate measuring means installed at the entrance of the water distribution network;
End pressure measuring means installed at the end of the water distribution network;
Decompression control means for controlling the valve opening based on the decompression amount;
Terminal pressure control means for calculating the amount of pressure reduction based on the terminal pressure target value;
Based on the demand forecast value, the known discharge pressure value, and the terminal pressure target value, the optimum pressure reducing amount planning means for calculating the amount of pressure reduction required to keep the terminal pressure constant and outputting a feedforward signal for pressure reduction control. When,
A monitoring database for accumulating secondary pressure, flow rate and terminal pressure data of the valves obtained from the secondary pressure measuring means, the flow rate measuring means and the end pressure measuring means, respectively;
Based on the past valve opening, pressure loss, flow rate and end pressure data obtained from this monitoring database, pipe resistance estimation means for generating a pipe resistance curve suitable for the current water distribution process,
A water distribution pressure optimum control device comprising: Calculates the gain of the pressure reduction amount variation with respect to valve opening operation obtained based on the pipe resistance curve obtained in the conduit resistance estimating means, PID control parameter adjustment to readjust the computed gain as a parameter of the pressure reduction amount control The water distribution pressure optimum control device according to claim 6, further comprising means. Optimum distribution pressure for pumping clean water from the distribution water network of the water supply system via the pipeline to the end customer with a fixed speed pump, and finely adjusting the pressure using a regulating valve. Control device,
A secondary pressure measuring means for measuring a secondary pressure of a valve installed at the inlet of the water distribution network;
Flow rate measuring means installed at the entrance of the water distribution network;
End pressure measuring means installed at the end of the water distribution network;
Decompression control means for controlling the valve opening based on the decompression amount;
Terminal pressure control means for calculating the amount of pressure reduction based on the terminal pressure target value;
Based on the demand forecast value, the amount of decompression required to make the terminal pressure constant is calculated by the pipe resistance curve, and the optimum amount of decompression planning means for outputting a feedforward signal for decompression control,
A monitoring database for accumulating secondary pressure, flow rate and terminal pressure data of the valves obtained from the secondary pressure measuring means, the flow rate measuring means and the end pressure measuring means, respectively;
Based on the past valve opening, pressure loss, flow rate and end pressure data obtained from this monitoring database, pipe resistance estimation means for generating a pipe resistance curve suitable for the current water distribution process,
A water distribution pressure optimum control device comprising: It calculates the gain of the pressure reduction amount variation with respect to valve opening operation obtained based on the pump Q-H curve corresponding to the fixed-speed pump operation number and pipeline resistance curve obtained in the conduit resistance estimating means, the calculated gain 9. The water distribution pressure optimum control device according to claim 8, further comprising a PID control parameter adjusting means for re-adjusting the pressure as a parameter for pressure reduction amount control.

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