JP2013151833A - Water distribution operation control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain a loss in power consumption from being caused by the short-term starting and stop of a pump in a water distribution station.SOLUTION: A water distribution operation control system estimates a long-period change and a short-term fluctuation in demand amount, corrects a flow rate plan for each water distribution station so that water-delivery of another water distribution station can be further changed than when the number of operating pumps is increased/decreased in a water distribution station assuming the short-term fluctuation, and controls each water distribution station. Thereby, the provided water distribution operation control system dynamically switches the water distribution station for controlling pressure by reflecting a state of a water distribution network, and reduces wear in pump-related facilities and a loss in pump power consumption by suppressing the short-term starting and stop of a distributing pump.

Description

  It relates to water distribution operation control equipment.

  Patent Document 1 states that “the terminal pressure control device of the present invention obtains pressure characteristics based on the relationship between the distribution flow rate and the distribution pressure of each machine that affects each end pressure measurement point of the distribution pipe network. The pressure control machine field selection means selects a machine for pressure control based on the pressure characteristics created by the pressure characteristic creation means. Based on this, the distribution pressure target value for the machine selected by the pressure control machine selection means is determined, and the distribution pressure control means controls the machine so that the actual distribution pressure value follows the distribution pressure target value. Have been described.

JP 2001-188614

  Patent Document 1 does not describe anything about the wear of pump-related equipment and the loss of pump power consumption when starting and stopping the water distribution pump in the short term. Moreover, it is not a method for dynamically switching the selection of the machine for pressure control.

Therefore, as an example of the present invention,
A demand forecasting unit for forecasting long-term changes in demand in the water distribution network;
A flow rate planning unit for planning a flow rate of a water distribution station based on the prediction of the demand amount;
A control mode planning unit for planning a control mode of the water distribution station based on the flow rate plan;
A demand fluctuation forecasting unit for forecasting short-term fluctuations in demand in the water distribution network;
Number increase / decrease condition storage unit storing the number of pumps installed in the water distribution station and the increase / decrease conditions of the number of pumps operated,
Based on the increase / decrease condition of the number of pumps operated, the short cycle fluctuation prediction of the demand amount and the flow plan, the range of the long period variation and short cycle fluctuation of the water distribution amount of each water distribution station is predicted, and the demand amount A distribution plan correction unit that corrects the flow rate plan of each distribution station so that the distribution amount of other distribution stations is changed rather than increasing or decreasing the number of pumps operated against the long-term change of the distribution amount in the distribution stations that bear short-term fluctuations When,
An operation amount calculation unit that calculates a control command for each water station that follows the corrected flow rate plan and optimizes the pressure in the water distribution network,
The water distribution operation control device includes a transmission unit that transmits the control command to each water distribution station.

  According to the present invention, the water distribution station that performs pressure control dynamically reflects the state of the water distribution pipe network, and the short-term start / stop of the water distribution pump is suppressed to reduce the wear of pump-related equipment and the power consumption of the pump. A water distribution operation control device that reduces loss can be provided.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a figure which shows the structural example of a water distribution operation control apparatus. It is a hardware block diagram of a water distribution operation control apparatus. It is a block diagram of the apparatus and control apparatus of a water distribution station connected to the water distribution operation control apparatus. It is a table which shows the water distribution plan recorded on a water distribution plan memory | storage part. It is a figure which shows the controllable range of the flow volume and total head in a water distribution station resulting from the pump capability recorded on the operation condition memory | storage part. It is a table which shows the upper and lower limit value of the cumulative water distribution amount of the water distribution station recorded in the operation condition storage unit. It is a figure explaining selection of the control point in a distribution pipe network in processing of a control mode planning part. It is a table which shows the result of the sensitivity analysis for selecting the water supply station of a pressure control mode in the process of a control mode planning part. It is a figure which shows the increase / decrease conditions of the pump operation number of a water distribution station. It is a figure explaining the fluctuation | variation with the long period change of a demand amount and a short period. It is a figure explaining the correction process of the water distribution plan which suppresses the pump number increase / decrease by short cycle demand fluctuation. It is a flowchart of the correction process of the water distribution plan which suppresses the pump number increase / decrease by short cycle demand fluctuation. It is a figure explaining the correction process of the water distribution plan which implements increase / decrease in the number of pumps by a plan trend rapidly. It is a flowchart of the correction process of the water distribution plan which implements increase / decrease in the number of pumps by a plan trend rapidly.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings using examples. The same reference numerals are assigned to substantially the same parts, and the description will not be repeated.

  FIG. 1 is a diagram illustrating a configuration example of the water distribution operation control apparatus 101.

  The water distribution operation control apparatus 101 includes a flow rate planning unit 151, a control mode plan planning unit 152, a hydraulic analysis calculation unit 153, a demand prediction unit 154, a demand fluctuation prediction unit 155, a water distribution plan correction unit 156, Operation amount calculation unit 157, data collection unit 158, transmission unit 159, actual water distribution amount storage unit 171, operation condition storage unit 172, analysis condition storage unit 173, water distribution plan storage unit 174, number increase / decrease conditions And a storage unit 175.

  The objects controlled by the water distribution operation control device 101 are the water distribution station A, the water distribution station B, and the water distribution station C. In this embodiment, only the water distribution station is controlled. However, in a distribution pipe network including, for example, a facility having a valve, a booster pump, or the like as a control target of the water distribution operation control device, the facility is referred to as a water distribution facility. In that case, if necessary, the water distribution facility can be regarded as a water distribution station and can be handled as a target for planning and control described later.

  Water is distributed from the three water distribution stations A, B, and C to the water distribution network 111, and a remote sensor 112 and a remote sensor 113 are provided to monitor the state in the water distribution network 111. is set up.

  The water distribution station A includes a water distribution reservoir 121, a control device 122, a water distribution pump facility 123, and a sensor 124. The water distribution station B is composed of a water reservoir 131, a control device 132, a valve facility 133, and a sensor 134. The water distribution station C includes a water distribution reservoir 141, a control device 142, a water distribution pump facility 143, and a sensor 144. For the sake of simplicity, water treatment plants that supply purified water to the reservoirs of each water distribution station are not listed. Actually, each water distribution station is connected to a water purification plant, or receives purified water from the water purification plant via a water pipe. Although not all the information lines are shown in the figure, the control device and each remote sensor of each water distribution station are connected to the water distribution operation control device 101 via the communication network. Each water distribution station sensor and each remote sensor transmit the measured sensor data to the data collection unit 158 of the water distribution operation control apparatus 101. In addition, an instruction value for controlling the pump and the valve is transmitted from the transmission unit 159 of the water distribution operation control apparatus 101 to each water distribution station.

  The demand prediction unit 154, the flow rate planning unit 151, and the control mode plan planning unit 152 have a function of planning a water distribution plan.

  The water distribution plan is the amount of water distributed by each water distribution station based on the demand forecast over a predetermined period (for example, one day later) from the time of planning (hereinafter referred to as the planning period), and each water distribution described below. It is a plan that defines the control mode of the place. The water distribution plan will be described later together with the explanation of FIG.

  The water distribution plan is made periodically, for example, every 30 minutes, and the demand forecast amount, the change in the water level of the water reservoir, the water distribution amount shared by the water distribution station, etc. are updated to reflect the latest information obtained at that time.

  Periodic updates correct plans and system state deviations multiplied by deviations from initial forecasts of demand, such as deviations in reservoir water levels and deviations in daily accumulated values of water distribution at each distribution station Operation control can be continued.

  The shared water distribution amount is a flow rate at which each of the water distribution station A, the water distribution station B, and the water distribution station C distributes water so that the demand amount of the water distribution pipe network 111 is shared and supplied.

  The demand forecasting unit 154 receives the past and current actual water distribution data recorded in the actual water distribution storage unit 171 as an input, and uses the past actual water distribution data, for example, to determine future demand from the past and current water distribution data. A regression equation that predicts the amount is constructed, and the process of substituting the data of the actual water distribution amount necessary for the regression equation is performed, so that the long-term change in demand in the planning period is predicted, that is, the average of 30 minutes to 1 hour The demand forecast amount is output and transmitted to the flow rate planning unit 151 and the hydraulic analysis calculation unit 153. In addition, since the sum total of the water distribution amount from all the water distribution stations corresponds to the total demand amount in the water distribution pipe network, the demand prediction unit 154 treats the actual water distribution data as the actual demand data. Since the process which performs demand prediction can utilize a well-known technique, it abbreviate | omits for details.

  Here, the long-period change refers to a comparison with a short-period fluctuation of about 5 minutes predicted by a demand fluctuation prediction unit 155 described later, and means a change in demand where there is little demand at night and much demand during the day. Yes.

  It is desirable that the demand prediction not only predicts the demand amount in the entire distribution pipe network but also divides the distribution pipe network into appropriate areas according to demand characteristics and the like to predict the demand amount in each area. For example, since the usage pattern of water demand is different in areas with many houses and areas with many commercial customers, it is possible to improve the accuracy of hydraulic analysis calculation described later by predicting the demand amount for each area.

  The flow rate planning unit 151 receives the demand forecast amount calculated by the demand prediction unit 154, the conditions to be satisfied by the flow rate plan stored in the operation condition storage unit 172, and the evaluation function of the flow rate plan, and the flow rate in the planning period. The plan is output and transmitted to the control mode planning unit 152. The plan of the shared water distribution amount as an output will be described later together with the recorded contents of the water distribution plan storage unit 174 in the description of FIG. In addition, the flow rate plan refers to a plan for the shared water distribution during the planning period. In the process of the flow planning unit 151, the shared water distribution amount at each time in the planning period is used as a decision variable and described as an optimization problem that minimizes the evaluation function recorded in the operation condition storage unit 172. For example, a genetic algorithm Using an optimization technique such as the above, a search is performed by changing a decision variable within a range of conditions to be satisfied by the flow rate plan recorded in the operation condition storage unit 172, and by solving the optimization problem, an output flow rate is obtained. Get the plan as the optimal solution.

  When calculating the value of the evaluation function, the flow rate planning unit 151 takes up candidates for the flow rate plan, gives the flow rate plan as an input to the hydraulic analysis calculation unit 153 described later, performs hydraulic calculation, and performs hydraulic analysis. An estimated value of the state of the distribution pipe network such as a pressure at a node of the distribution pipe network is acquired from the output of the calculation unit 153, and the value of the evaluation function is calculated using the estimated value of the state.

  As an evaluation function stored in the operation condition storage unit 172, for example, the amount of deviation from the appropriate range of pressure in the distribution pipe network, the amount of deviation from the operation range of the water level of the reservoir, and the distribution of the distribution amount / distribution pressure It is possible to use a function in which an index value that can be calculated from the state of the water distribution network, such as the deviation from the control capacity range of the station and the sum of the pump power consumption of all the water distribution stations, can be used. Details of the description as an optimization problem and its solution are omitted here because known techniques can be employed.

  The control mode plan drafting unit 152 receives the flow rate plan calculated by the flow rate plan drafting unit 151 and the conditions to be satisfied by the control mode plan stored in the operation condition storage unit 172, and distributes water pipes for each time in the plan period. A point where pressure is mainly managed in the network is extracted as a control point, and the water station that most effectively adjusts the pressure of the extracted control point is selected by sensitivity analysis of hydraulic analysis calculation, and the water station in the pressure control mode is selected. Is set, the control mode plan is processed, the control mode plan of each water distribution station is output, and the flow plan and the control mode plan are combined and recorded in the water distribution plan storage unit 174.

  The control mode of the water distribution station includes a flow rate control mode for controlling the water distribution amount with the planned flow rate as a target, and a pressure control mode for controlling the discharge pressure so as to optimize the pressure distribution in the water distribution pipe network 111.

  The plan of the control mode refers to a plan in which the control mode of the water distribution target to be controlled is determined from either the flow rate control mode or the pressure control mode for each time in the planning period.

  In the case of a distribution system that distributes water by pushing from a plurality of distribution stations as in the distribution pipe network 111 of FIG. 1, one distribution station is set to the pressure control mode, and the remaining distribution stations are set to the flow rate control mode.

  Therefore, in the process of the control mode planning unit 152, for each time in the planning period, control of all the water stations by selecting one water station A, water station B, and water station C as the pressure control mode. Define the mode.

  As a condition to be satisfied by the control mode plan stored in the operation condition storage unit 172, for example, a condition such that the water distribution station B is always set to the flow rate control mode is set.

  A method for selecting a water station for pressure control from water stations to be controlled, which is a specific processing content of the control mode planning unit 152, will be described later with reference to FIGS. 7 and 8.

  In addition, when facilities having valves and booster pumps are installed in the water distribution pipe network, and such facilities are also handled as water distribution facilities to be controlled by the water distribution operation control device 101, one water distribution station in the pressure control mode is selected. There are cases where it is appropriate to set multiple numbers. Even in such a case, conditions for setting a plurality of water distribution stations to be in the pressure control mode are recorded in the operation condition storage unit 172, and the control mode planning unit 152 considers the conditions so that the present invention can be used. The water distribution operation control apparatus 101 can be applied.

  The water distribution plan storage unit 174 stores the water distribution plan calculated by the flow rate plan planning unit 151 and the control mode plan planning unit 152, and the water distribution plan correction unit 156 and the manipulated variable calculation unit as target values of control commands to each water distribution station. 157. Details of the information to be stored will be described later with reference to FIG.

  As described above, the operation condition storage unit 172 records the conditions to be satisfied by the flow rate plan, the evaluation function of the flow rate plan, and the conditions to be satisfied by the stored control mode plan. The evaluation function will be supplemented in the description of FIG. 5, and the conditions to be satisfied by the flow rate plan will be supplemented in the description of FIG. The hydraulic analysis calculation unit 153 is called by the flow rate planning unit 151, the control mode planning unit 152, or the operation amount calculation unit 157 for processing of the caller, and is input to the analysis condition storage unit 173 as an input. Information on the recorded distribution pipe network 111 model, estimated demand amount output by the demand prediction unit 154 as information on the demand amount of the distribution pipe network 111, or the control point estimated demand amount configured by the operation amount calculation unit 157, and the flow rate Output by the process of performing the hydraulic calculation of the water distribution pipe network using the calculation condition additionally given from the caller of either the planning unit 151 or the control mode planning unit 152 or the operation amount calculation unit 157 As a result, the pressure at the nodes of the distribution pipe network, the flow rate of the pipes of the distribution pipe network, and the estimated value of the water level change in the distribution reservoir are calculated and transmitted to the caller.

  Hereinafter, the pressure at the nodes of the distribution pipe network, the flow rate of the pipes of the distribution pipe network, and the change in the water level of the distribution reservoir will be referred to as the state of the distribution pipe network.

  The hydraulic calculation is a steady state analysis for calculating the state of the distribution pipe network at a certain time, and the steady state analysis is performed at regular time intervals (for example, every hour) on the simulation. This means either one of the extended period analysis (Extended Period Analysis) for predicting the state of the water distribution network in time series.

  In the call from the flow rate planning unit 151, the extended period analysis is performed. In the call from the control mode planning unit 152 or the operation amount calculation unit 157, the steady state analysis is performed. Since hydraulic calculation is a known technique, details are omitted.

  The analysis condition storage unit 173 is a model of the distribution pipe network 111 that is an input to the hydraulic analysis calculation unit 153. The connection relation of the pipes constituting the distribution pipe network, the diameter, length, and flow velocity coefficient of each pipe line A water distribution network model consisting of the spatial distribution of demand is constructed and stored as hydraulic analysis conditions.

  The demand fluctuation prediction unit 155, the water distribution plan correction unit 156, and the operation amount calculation unit 157 have a function of calculating a control command to each water distribution station based on the water distribution plan and the collected data.

  The calculation of the control command is performed at a cycle that is approximately the same as the cycle for collecting new data. For example, when data from each water distribution station or remote sensor can be collected at a cycle of 1 minute, the control command is calculated at a cycle of about 1 minute to 5 minutes.

  The demand fluctuation prediction unit 155 receives the past and present actual water distribution data recorded in the actual water distribution storage unit 171 as an input, and estimates the magnitude that the demand amount fluctuates in a short cycle of several minutes, that is, a short cycle. The fluctuation prediction is output and transmitted to the water distribution plan correction unit 156. Details of the processing of the demand fluctuation prediction unit 155 will be described later with reference to FIG.

  The water distribution plan correction unit 156 outputs the water distribution plan recorded in the water distribution plan storage unit 174, the increase / decrease condition of the number of pumps operating in the water distribution station recorded in the unit increase / decrease condition storage unit 175, and the demand fluctuation prediction unit 155. Using the short-term demand fluctuation prediction, the sensor measurement value at the time of control received from the data collection unit 158 and the pump operation state of the water distribution station as inputs, the range of long-term change and short-period fluctuation of the water distribution amount at the water distribution station Predict and change the distribution volume of other distribution stations based on the conditions of increase / decrease in the number of pumps operated, rather than increasing / decreasing the number of pumps operated at a distribution station that is responsible for short-term fluctuations in the distribution volume Then, a water distribution plan in which the flow rate plan of each water distribution station is corrected is output and transmitted to the operation amount calculation unit 157.

  Details of the processing of the water distribution plan correction unit 156 will be described later with reference to FIGS. 11 to 14.

  The operation amount calculation unit 157 receives the corrected water distribution plan output from the water distribution plan correction unit 156 and the sensor measurement value at the time of control received from the data collection unit 158 as an input, and follows the corrected water distribution plan. A control command (operation amount) including a control mode and a control target value of each water distribution facility to be controlled so as to keep the water distribution pressure in the net 111 within an appropriate range is output, and each water distribution facility is transmitted via the transmission unit 159. Send to control device.

  The control device of the water distribution station, for example, the control device 142 receives the control command from the transmission unit 159 and controls the pump equipment so as to follow the control mode and the control target value specified in the control command. Control of the pump equipment by the control device 142 will be described later with reference to FIG.

  A known technique may be used for the calculation process of the control command. For example, a water distribution station in the flow control mode is fixed to distribute water according to the corrected flow plan value, and the discharge pressure of the water distribution station in the pressure control mode is set as a search target using the discharge pressure. The hydraulic analysis calculation unit 153 is called with the operation method of the water station in both control modes as an input, and a search is made for a decision variable so as to minimize an objective function value obtained by calculation from the calculation result, and the pressure control mode Determine the discharge pressure of the water station. As the objective function, it is possible to select a deviation amount of the pressure value calculated by the hydraulic analysis calculation unit 153 at a control point, which will be described later, from a preset appropriate range. In order to obtain a good control performance of the pressure in the pipe network, the demand amount at the time is calculated using the collected sensor data and used as an input to the hydraulic analysis calculation unit 153, and the prediction from the demand prediction unit 154 is performed. Replace with value.

  The calculation method of the operation amount calculation unit 157 is not limited to the method using the hydraulic analysis calculation unit 153, and an arbitrary method such as a method of determining the operation amount with a table or calculation formula separately determined based on empirical knowledge is used. be able to.

  The number increase / decrease condition storage unit 175 stores a condition for switching the number of pumps operated at a water distribution station that performs control by changing the number of pumps operated. Specifically, the number of pumps installed in the water distribution station, the capacity characteristics of each pump, the operation state range for each pump operation number, and information on conditions for increasing or decreasing the number of pump operation are stored. The increase / decrease conditions of the number of pumps operated will be described later with reference to FIG.

  In addition, the information recorded in the number increase / decrease condition storage unit 175 is information recorded in the number increase / decrease condition storage unit of the control device of the water distribution station such as the number increase / decrease condition storage unit 365 with respect to the information regarding each water station. Is equivalent to

  The number increase / decrease condition storage unit 175 does not record the number increase / decrease conditions as fixed information, but may collect and provide information on the number increase / decrease information from the control device of each water distribution station in real time via the communication network. .

  The data collection unit 158 collects sensor information from each water distribution station and each remote sensor. The actual water distribution amount is recorded in the actual water distribution storage unit 171 together with the date / time information.

  The hardware configuration of the water distribution operation control device will be described with reference to FIG. In FIG. 2, the water distribution operation control apparatus 101 includes a CPU 201, a memory 202, a media input / output unit 203, an input unit 205, a communication control unit 204, a display unit 206, a peripheral device IF unit 207, and a bus 210. It consists of and.

  The CPU 201 executes a program on the memory 202. The memory 202 temporarily stores programs, tables, and the like. The media input / output unit 203 holds programs, tables, and the like. The input unit 205 is a keyboard, a mouse, or the like. The communication control unit 204 is connected to the network 220. The display unit 206 is the display illustrated in FIG. The peripheral device IF unit 207 is an interface such as a printer. The bus 210 interconnects the CPU 201, memory 202, media input / output unit 203, input unit 205, communication control unit 204, display unit 206, and peripheral device IF unit 207.

  As is clear from the comparison between FIG. 1 and FIG. 2, the water distribution operation control apparatus 101 of FIG. 1 is realized by the CPU 201 executing the program.

  FIG. 3 is a configuration diagram of the equipment and control device of the water distribution station C. The water distribution pump facility 143 includes a pump 301, a pump 302, a pump 303, and a discharge valve 311, a discharge valve 312, and a discharge valve 313 installed at the discharge port of each pump.

  The pump 301 and the pump 302 are variable speed pumps in which inverters are installed, and the pump rotation speed can be changed in accordance with a control signal received from the control device 142. Further, the opening degree of each discharge valve can be changed in accordance with a control signal received from the control device 142.

  The transmission signal 340 is a signal transmitted from the transmission unit 159 of the water distribution operation control apparatus 101, and the control mode (either pressure control or flow control) of the water distribution station and the target value (pressure target value or flow rate) in the control mode. Target value).

  The control device 142 receives the measured value of the transmission signal 340 and the sensor 144 as input, and uses the control unit of the control mode specified by the transmission signal 340 to distribute the water distribution pump equipment 143 so as to follow the control target value specified by the transmission signal 340. The control signal of each equipment is output.

  The control mode switching unit 330 receives the transmission signal 340, reads the control mode information of the transmission signal 340, and corresponds to whether the control mode information is in the pressure control mode or the flow rate control mode. 331 or the flow rate control unit 332 is selected as a control unit to be activated, and the control target value of the transmission signal 340 is transmitted to the control unit to be activated.

  The sensor 144 measures the discharge pressure and discharge flow rate (distribution flow rate) of the water distribution station C and transmits them to the control device 142.

  The pressure control unit 331 receives the discharge pressure control target value of the transmission signal 340 and the measurement value of the sensor 144 as inputs, and the pump pressure control target value and the measurement value increase / decrease the number of pumps recorded in the number increase / decrease condition storage unit 365. A process for determining whether the condition is satisfied, and a calculation process for calculating the rotational speed of the variable speed pump and the opening degree of the discharge valve by the PI control logic configured to cause the discharge pressure of the measured value to follow the control target value. When the number increase / decrease condition is met, a command to start or stop the pump to be started or stopped is output, and the rotation speed of the variable speed pump and the opening of the discharge valve are output, via the transmission unit 350 It transmits to the water distribution pump equipment 143 and changes the operation state of each equipment.

  Note that the pressure control unit 331 performs not only the discharge pressure control for controlling the discharge pressure measured by the sensor 144 to follow the target value, but also the end pressure control for controlling the end pressure in the water distribution network 111. Also good. Alternatively, estimated terminal pressure control for calculating the discharge pressure so that the terminal pressure estimated value at the representative point in the water distribution pipe network 111 that can be calculated from the discharge flow rate value and the discharge pressure value measured by the sensor 144 is set as the specified target value. It is good also as performing.

  When performing the terminal pressure control, the pressure control unit 331 collects, for example, the pressure values measured by the remote sensor 112 via the communication network, and uses them for the operation amount calculation in the pressure control unit 331 instead of the measurement values of the sensor 144. .

  The flow rate control unit 332 receives the discharge flow rate control target value of the transmission signal 340 and the measurement value of the sensor 144 as inputs, and the pump flow rate control target value and the measured value increase or decrease the number of pumps recorded in the number increase / decrease condition storage unit 365. Processing for determining whether the condition is met, and calculating and processing the rotational speed of the variable speed pump and the opening of the discharge valve by the PI control logic configured to cause the discharge flow rate of the measured value to follow the control target value. When the number increase / decrease condition is met, a command to start or stop the pump to be started or stopped is output, and the rotation speed of the variable speed pump and the opening of the discharge valve are output, via the transmission unit 350 It transmits to the water distribution pump equipment 143 and changes the operation state of each equipment.

  FIG. 4 is a table showing a water distribution plan recorded in the water distribution plan storage unit 174. As an example, 24 hours from 3:00 on March 13 to 3:00 on March 14 are divided into 30-minute intervals, and the amount of water distributed by each water distribution station and the water distribution stations subject to pressure control at each time Is stipulated.

  With respect to the date and time defined by the date information 401 and the time information 402, the demand distribution information 403 indicating the predicted demand quantity, the distribution water distribution amount of each water distribution station, the water distribution station A water distribution information 404, the water distribution station B water distribution information 405 , Distribution center C water distribution amount information 406. In addition, control points to be described later in FIG. 7 are shown in the control point information 407, and water distribution stations to be subjected to pressure control are given by the pressure control water distribution station information 408. It means that a water distribution station not designated in the pressure control water distribution station information 408 is a target of flow rate control.

  Distribution point A distribution amount information 404, distribution point B distribution amount information 405, distribution point C distribution amount information 406 are each in flow rate planning section 151, and control point information 407 and pressure control distribution point information 408 are This is information calculated by the control mode planning unit 152.

  FIG. 5 is a diagram showing the controllable range of the flow rate and the total head in the water distribution station due to the pumping capacity recorded in the operation condition storage unit 172. A description will be given by taking the water distribution station C shown in FIG. 3 as an example. The area shaded in the controllable area 501 of the graph indicates the area of the water distribution amount and the total head (discharge pressure) that can be controlled by changing the number of pumps operated and the rotation speed of the variable speed pump.

  The curve at the lower left of the area shows the pump capacity (performance) characteristics when one variable speed pump is operated at the minimum speed, and the curve at the upper right of the area operates all pumps (two variable speed pumps and one fixed speed pump). Variable speed pumps have parallel pump capacity characteristics when operating at maximum speed.

  The operation condition storage unit 172 holds information on a controllable range for each water distribution station. The flow rate planning unit 151 uses, as one evaluation index, a deviation amount (distance from the range) of the operation state of the water distribution station from the controllable range, and adds it to the evaluation function so as not to deviate from the controllable range. Develop a water distribution plan that will be controlled in the future.

  FIG. 6 is a table showing the upper and lower limit values of the cumulative water distribution amount of the water distribution stations recorded in the operation condition storage unit held in the operation condition storage unit 172. Consists of information on the upper and lower limit values (minimum value and maximum value) that can be shared for the daily amount of water distribution for each water distribution station.

  The amount of water distribution at each time is a condition that the facility capability shown in FIG. 5 should satisfy, but the table of FIG. 6 gives a constraint on the cumulative amount of water distributed daily. For example, a distribution station that receives water supply from another water company can change the amount of water distribution within the range of facility capacity at each time, but it is accumulated for one day due to contracts with other companies. It is difficult to change the amount of water distribution in quantity.

  The flow rate planning unit 151 can contribute to the compliance with the contract by searching for candidates for the flow rate plan within a range that satisfies the conditions of this table.

  FIG. 7 is a diagram illustrating selection of control points in the water distribution pipe network in the processing of the control mode planning unit 152. In the control of water distribution, it is required to keep the pressure within an appropriate range in the entire pipe network, but in particular, it is required to keep the pressure drop point to a minimum necessary pressure or more. In view of this, the control mode planning unit 152 extracts, as control points, points where pressure is preferentially managed in the water distribution network at each time during the planning period. For example, from the calculation result of the hydraulic analysis calculation unit 153, one node having the lowest pressure is selected as the control point.

  During times of high demand, pressure drops due to pressure loss due to pipe friction, and pressure drops at points far from the water distribution station. On the other hand, during times when demand is low, the discharge pressure of the water distribution station is lowered, so the pressure drops at a high altitude regardless of the geographical distance from the water distribution station.

  By extracting the pressure drop point at each time, the change of the pressure drop point with time can be captured.

  The control points may be extracted from all the nodes in the hydraulic analysis, or the candidates are limited to the control point candidates 701, 702, 703, and pressure drop points are selected from the candidates. It is good to choose.

  The control point candidate does not necessarily have to be the remote sensor installation position. By using the hydraulic analysis calculation, the position where the remote sensor is not installed can be used as the control point. However, the remote sensor is not absolutely necessary, and it is important to use the value of the remote sensor in order to improve the accuracy of hydraulic analysis calculation and the control performance.

  FIG. 8 is a table showing a result of sensitivity analysis for selecting a water distribution station in the pressure control mode in the process of the control mode planning unit 152. In the process of the control mode planning unit 152, a water station that most effectively adjusts the pressure of the control point extracted by the above method is selected as a water station for pressure control at each time of the planning period.

  The time when the control point candidate 701 is extracted as a control point will be described. The hydraulic analysis calculation at that time has already been performed by the flow rate planning unit 151. Using the calculation conditions as reference conditions, sensitivity analysis is performed to check changes in calculation results by adjusting the conditions as follows.

  For each candidate for a water distribution station in pressure control mode, increase the discharge pressure of the water distribution station by a certain amount relative to the reference condition, and set the conditions so that the other water distribution stations have the same amount of water distribution as the reference condition. To calculate.

  Regarding the calculation results for each candidate, it is confirmed how much the pressure calculation result of the control point has increased from the calculation result of the reference condition. A water station candidate having a large ratio of the pressure increase amount at the control point to the discharge pressure increase amount is selected as a water station in the pressure control mode.

  Each row of FIG. 8 represents a calculation result when the water distribution station indicated in the water distribution station information 801 is a candidate for the pressure control mode and the discharge pressure is increased by 2.0 m as indicated by the discharge pressure increase amount information 802. The control point pressure increase information 803 shows the control point pressure, and the sensitivity information 804 shows the ratio of the control point pressure increase to the discharge pressure. In this example, the water distribution station A having the largest sensitivity information 804 is selected as a water distribution station in the pressure control mode and registered as a water distribution plan.

  By using the sensitivity analysis of the hydraulic analysis calculation, the most suitable water distribution station for optimizing the pressure at the control point can be selected as the pressure control mode.

  FIG. 9 is a diagram showing an increase / decrease condition of the number of pumps operating in the water distribution station. These conditions are stored in the number increase / decrease condition storage unit 175 of the water distribution operation control device 101, the number increase / decrease condition storage unit 365 of the control device 142, and the like.

  FIG. 9A shows the number increase / decrease conditions based on the determination condition that the discharge flow rate (water distribution amount) changes across the threshold regardless of the discharge pressure. In the figure, for example, when the discharge flow rate increases across the flow rate threshold value described as “2 units → 3 units”, the control device of the water distribution station stops the pump 1 so as to increase the number of pumps from 2 units to 3 units. Activate the stand. In addition, for example, when the discharge flow rate decreases across the flow rate threshold described as “2 units → 1 unit”, the control device of the water distribution station reduces the number of pumps from two to one. Stop.

  FIG. 9B shows the number increase / decrease condition based on the determination condition that the set of the discharge pressure and the discharge flow rate (water distribution amount) changes across the boundary line on the plane of the set. In the figure, for example, when the combination of discharge pressure and discharge flow rate changes across the boundary of the solid line described as “2 units → 3 units” and enters the area described as “3 units”, the control device of the water distribution station Activates one stopped pump to increase the number of pumps from two to three. For example, when the set of discharge pressure and discharge flow changes across the boundary of the broken line described as “2 units → 1 unit” and enters the area described as “1 unit”, the control device of the water distribution station Stop one operating pump to reduce the number from two to one.

  The condition (a) can be regarded as a special setting example of the condition (b), and is a widely used condition. On the other hand, the power consumption of the pump can be reduced by appropriately determining the increase / decrease condition (b) according to the capacity and efficiency of the pump.

  The reason why the conditions for increasing the number of operating units and the conditions for decreasing are not the same and there is room is to prevent frequent start / stop of the pump when the operating state fluctuates in the vicinity of the increase / decrease conditions. . For example, in the condition (a), the flow rate threshold value of “2 units → 3 units” is set larger than the flow rate threshold value of “3 units → 2 units”.

  In addition, FIG. 9 is an example of the increase / decrease conditions of the water distribution station which has the same type pump. Although the increase / decrease conditions of a water distribution station having a combination of pumps having different capacities are more complicated, the increase / decrease conditions are determined by the discharge flow rate (water distribution amount) and discharge pressure.

  The control device 142 refers to the number increase / decrease condition, and performs start / stop operation of the pump in the water distribution station by determining whether the change in the operation state such as the discharge flow rate or the discharge pressure satisfies the condition. Moreover, the water distribution plan correction | amendment part 156 of the water distribution operation control apparatus 101 refers to the number increase / decrease conditions, determines the operation state of each water station, and its change prediction, and determines whether the water station pump is started or stopped. Predict.

  FIG. 10 is a diagram for explaining a change in a demand amount in a long cycle and a change in a short cycle. In general, the amount of water demand (distribution) changes as shown in the upper graph, which is low at midnight and high in the morning and evening. It is not uncommon for the ratio of the daily minimum water distribution to the maximum water distribution to be more than five times.

  This change in demand during the day is called long-term change. It is known that the change in the long cycle can be predicted with high accuracy from the past actual value by considering the influence of the season, the day of the week, the temperature, etc., and in the water distribution operation control apparatus 101, the demand prediction unit 154 performs the prediction. .

  On the other hand, the demand amount also shows small fluctuations in a short cycle as shown in the lower graph, and such fluctuations are difficult to predict. For example, the demand amount may fluctuate in a short period of about 5 minutes with a magnitude of about 5% to 10% of the demand amount at that time.

  The demand fluctuation prediction unit 155 calculates the average magnitude ρ of short cycle fluctuations from the actual water distribution amount recorded in the actual water distribution amount storage unit 171. For example, the standard deviation of the water distribution amount of 1 minute period is calculated for every time of every 30 minutes, and it is set as average magnitude (rho).

  Further, in the demand fluctuation prediction unit 155, when forecasting the short-term fluctuation of the demand amount, only the data of the section including the same time as the time of forecasting the fluctuation and the same day of the week is used, and the prediction in the section including the time is performed. The fluctuation is predicted using only data in which the difference between the demand amount and the actual demand amount falls within a predetermined range.

  In the section including the same time as the target time for forecasting the demand fluctuation, the average size is calculated by extracting the data whose demand forecast quantity at that time is close to the actual demand quantity from the actual water distribution quantity data. Used for. In particular, only data on the same day of the week as the day on which the demand fluctuation is predicted is extracted and used in the calculation. For example, when calculating for a section from 8:00 am to 8:30 am on a certain Monday, among the actual water distribution for the past year, the data for the section from 8:00 am to 8:30 am on the same Monday, Only data is extracted and used for the calculation of the standard deviation for a day in which the difference between the predicted demand amount and the actual demand amount in this section falls within a predetermined range.

  FIG. 11 is a diagram illustrating a water distribution plan correction process that suppresses increase / decrease in the number of pumps due to short cycle demand fluctuations in the process of the water distribution plan correction unit 156. It is assumed that the water distribution station A is in the pressure control mode.

  The above-described fluctuations in demand in a short cycle appear almost directly in fluctuations in the amount of water distribution at distribution station A. For this reason, the amount of water distribution varies under the influence of short-term fluctuations, and the number of pumps operated at water distribution station A may frequently start and stop.

  When water distribution station A is operating with two pumps and the water distribution amount is close to the threshold flow rate for shifting to three pump operation, the third pump may start due to an increase in the water distribution amount due to short-term fluctuations Is expensive. However, since the increase in the amount of water distribution is a fluctuation in a short cycle, for example, after 10 minutes, the water distribution amount greatly decreases, and one pump may stop and return to the same two-unit operation as before the start.

  Although it is necessary to start the pump in response to the increasing trend of water distribution due to long-term changes, avoid starting and stopping the pump due to short-term fluctuations as much as possible because it may increase the load on the pump equipment and increase power consumption. Want to.

  Therefore, in the process of the water distribution plan correction unit 156, although the long-term change (flow rate plan) of the water distribution amount is not an increasing trend, the actual water distribution trend of the water distribution station A increases, and the pump is stopped due to the short period fluctuation of the size ρ. When it is predicted that the pump will be started, rather than starting the pump during stoppage, the flow rate planned value of the water station A is decreased by a predetermined correction amount so as to increase the water volume of the other water station. The flow rate plan is corrected by increasing the flow rate planned value at the location B by a predetermined correction amount. The value calculated by the demand fluctuation prediction unit 155 is used for the estimation ρ of the magnitude of the short period fluctuation. Due to this correction, the amount of water distribution at the water distribution station A is reduced, so that the start-up of the pump due to short-term fluctuations can be suppressed.

  As the actual water distribution trend, a value obtained by applying a filtering process such as a moving average or a first-order lag filter to the actual water distribution of 1 minute period can be used. As the correction amount, a constant multiple of the average magnitude ρ of the short period variation can be used.

  In the above example, the decrease in the flow plan of the water distribution station A is compensated by the water distribution station B, but the correction amount may be distributed by both the water distribution station B and the water distribution station C. It is desirable to select the water distribution station that can confirm that the pump of the water distribution station is not activated by the correction as the water distribution station in the flow rate control mode for performing the correction.

  In the above example, the case where the pump start-up due to the short cycle fluctuation is suppressed in the water supply station in the pressure control mode has been described, but the correction is also performed in the case where the pump stop is similarly suppressed. That is, in the process of the water distribution plan correction unit 156, although the long-term change (flow rate plan) of the water distribution amount is not a decreasing trend, the actual water distribution trend of the water distribution station A is reduced, and the pump in operation with a short period fluctuation of the size ρ. When it is predicted that the stoppage of water will be stopped, rather than stopping the pump in operation, the flow rate planned value of the water station A is increased by a predetermined correction amount so as to decrease the water supply amount of the other water station. The flow rate plan is corrected by decreasing the flow rate planned value at the location B by a predetermined correction amount.

  The example shown here is a process at a water distribution station using the water distribution amount shown in FIG. Even in a water distribution station having the number increase / decrease condition considering the pressure (lift) shown in FIG. 9 (b), the operation state is arranged so as to keep a constant distance from the increase / decrease condition boundary line for both the distribution amount and discharge pressure indicators. By correcting the amount of water, the same effect as the above example can be obtained.

  For example, what is necessary is just to determine to correct | amend, when the distance from a boundary line cannot be ensured only by said rho about the amount of water distribution, and k * rho ^ n about discharge pressure. However, k and n are constants determined separately, and ^ represents a power.

  FIG. 12 is a flowchart of a water distribution plan correction process that suppresses increase / decrease in the number of pumps due to short cycle demand fluctuations in the water distribution plan correction unit 156.

  In step 1401, correction processing is started.

In step 1202, it is determined whether or not the number of pumps operating is expected to increase or decrease due to short-term fluctuations in the amount of water distribution. Regarding the water distribution station in the pressure control mode, if the value obtained by adding ρ calculated by the demand fluctuation prediction unit 155 to the actual water distribution trend value corresponds to the pump number increase condition, it is determined that the number of units is expected to increase. That is,
Expected to increase when Qt + ρ> Qi
Qt: Actual water distribution trend value Qi: Threshold water distribution amount condition for the number of pumps increasing condition ρ: Average magnitude of short-period fluctuation. Alternatively, if the value obtained by subtracting ρ from the actual water distribution trend value corresponds to the condition for reducing the number of pumps, it is determined that the number of units is likely to decrease. That is,
Expected to decrease when Qt-ρ <Qd However,
Qt: Actual water distribution trend value Qd: Threshold water distribution amount of pump number reduction condition ρ: Average magnitude of short-period fluctuation. If none of the cases apply, it is determined that the number of units is not expected to increase or decrease.

  If not expected, the process proceeds to step 1406, and if expected, the process proceeds to step 1202.

  In step 1203, it is determined whether the increase or decrease in the number of pumps determined to be promising in step 1202 is consistent with the trend of the flow plan. It is determined that there is a consistency when the number of pumps is expected to increase and the flow plan trend is increasing, and that there is a possibility that the number of pumps is decreasing and the flow plan trend is decreasing is determined to be consistent. On the other hand, if the planned trend decreases or does not change due to the expected increase in the number of pumps, or if the planned trend does not increase or change due to the expected decrease in the number of pumps, it is determined that there is no consistency.

  Here, the flow plan trend refers to, for example, the change in the flow plan value at the time of control and the flow plan value at the next plan time. When the flow plan value increases, it increases, and when it decreases, the trend decreases. And

  If there is a match, the process proceeds to step 1406. If there is no match, the process proceeds to step 1204.

In step 1204, a correction amount of the flow rate planned value of the water distribution station in the pressure control mode, which is necessary to make the possibility determination of increase / decrease in the number of units unpredictable, is calculated. If the number of units is expected to increase, the amount of water distribution will be reduced. If the number of units is expected to decrease, the amount of water distribution will be calculated. For example,
ΔQ = Qi−Qt−ρ <0 (when the number of units is expected to increase)
= Qd-Qt + ρ> 0 (when the number is expected to decrease)
However,
ΔQ: Correction amount Qt: Actual water distribution trend value Qi: Threshold water distribution amount for pump number increase condition Qd: Threshold water distribution amount for pump number decrease condition ρ: Average size of short cycle fluctuation

  When the correction amount is larger than a preset limit value, a process of canceling the correction may be added because the influence on the water distribution operation is large.

  In step 1205, the correction amount calculated in step 1204 is distributed to the flow rate planned value in the flow rate control mode. For example, priority level information relating to correction of the flow rate plan may be retained so that a water station having a higher priority level can take charge of the total correction amount.

  Determine the possibility of increase or decrease in the number of pumps operating in the distribution control station where the correction amount is distributed, and if it is probable, reduce the absolute value of the correction amount, and at the distribution station where the correction amount is distributed Corrections may be made within a range where the number of units is not expected to increase or decrease.

In step 1406, the correction process is terminated.
After correcting the water distribution plan, it is determined whether or not the number of water supply stations in the pressure control mode is likely to increase or decrease even if the correction is reset every control cycle. If there is no expectation even if the correction is reset in the determination, the correction can be reset and the operation using the water distribution plan before the correction can be restored.

  FIG. 13 is a diagram illustrating a distribution plan correction process in which the number of pumps is increased or decreased quickly according to the planned trend in the process of the water distribution plan correction unit 156. It is assumed that the water distribution station A is in the pressure control mode.

  When three pumps are operating at the time of control, if it can be determined that the flow plan value at the next planned time can be operated with two pumps, the time of increase / decrease in the number of units can be advanced by correction of the water distribution plan. In general, even with the same water distribution amount and discharge pressure, power consumption is smaller when the number of pumps is small. Therefore, by rapidly reducing the number of pumps operated, it is possible to contribute to reduction of power consumption.

  By correcting to increase the amount of water distribution from the water distribution station B in the flow rate control mode, the water distribution amount of the water distribution station A decreases, and the number of pumps of the water distribution station A quickly decreases. However, we want to prevent the number of pumps at distribution station A from increasing again due to short-term fluctuations in the amount of water distribution and returning to the operation of three units. Therefore, after the decrease in the number of pumps, only when it can be expected that the increase in the number of pumps can be suppressed with a short cycle variation by the correction described in FIG.

  In other words, in the process of the water distribution plan correction unit 156, it is predicted that the operating pump will be stopped due to a decreasing trend of the long-term change in the water distribution amount (flow rate plan). When a short-term fluctuation of size ρ is added to the water flow trend, a correction amount is calculated to suppress the start of the stopped pump against the trend, and the correction amount is less than or equal to a predetermined amount In addition, in order to be able to quickly stop the pump during operation, the flow rate plan value of the water station A is decreased by the correction amount and the flow rate plan value of the water station B is increased by the correction amount. to correct.

  Further, in the process of the distribution plan correction unit 156, it is predicted that the stopped pump will be started due to an increase trend in the long-term change in the distribution amount (flow rate plan), and it is assumed that the stopped pump is started. When a short-term fluctuation of size ρ is added to the water flow trend, a correction amount is calculated to suppress the pump stoppage during startup against the trend, and the correction amount is less than or equal to a predetermined amount In addition, the flow rate plan is determined by increasing the flow rate plan value of water station A by the correction amount and decreasing the flow rate plan value of water station B by the correction amount so that the pump can be quickly started. to correct.

  FIG. 14 is a flowchart of a water distribution plan correction process in which the water distribution plan correction unit 156 promptly increases or decreases the number of pumps according to the planned trend.

  In step 1401, correction processing is started.

In step 1402, it is determined whether or not the number of pumps operated at the pressure controlled water distribution station is expected to increase or decrease based on the trend of the flow rate plan. When the planned flow rate at the next time becomes the amount of water distribution, it is determined from the information in the unit increase / decrease condition storage unit 175 whether the number of pumps operating increases or decreases from the current number. That is,
Expected unit increase when Qs> Qi, or unit decrease expected when Qs <Qd,
However,
Qs: Planned flow rate value at the next time Qi: Threshold water distribution amount for the pump number increase condition Qd: Threshold water distribution amount for the pump number decrease condition

  If no increase / decrease is expected, the process proceeds to step 1406. If increase / decrease is expected, the process proceeds to step 1403.

In step 1403, after the increase / decrease in the number of units, a correction amount necessary to prevent the number of pumps from rebounding due to a short period fluctuation is calculated. For example, in the example of FIG. 13, the difference between the actual water distribution trend value and the flow rate smaller by ρ is calculated from the increase determination flow rate from two to three pumps. For example,
ΔQ = Qi−ρ−Qt <0 (when the number is expected to decrease)
= Qd + ρ-Qt> 0 (when the number is expected to increase)
However,
ΔQ: Correction amount Qt: Actual water distribution trend value Qi: Threshold water distribution amount for conditions for increasing the number of pumps due to rebounding Qd: Threshold water distribution amount for conditions for decreasing the number of pumps due to rebounding ρ: Average magnitude of short-term fluctuations

  In step 1404, it is determined whether or not the correction amount calculated in step 1403 is within an applicable range set in advance.

  If it is outside the range, the process proceeds to step 1406. If it is within the range, the process proceeds to step 1405.

  In step 1405, as in step 1205 of FIG. 12, the correction amount is distributed to the water distribution stations in the flow rate control mode.

  In step 1406, the correction process is terminated.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

  Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

  Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

101 Water Distribution Operation Control Device 151 Flow Plan Planning Unit 152 Control Mode Planning Unit 153 Hydraulic Analysis Calculation Unit 154 Demand Prediction Unit 155 Demand Fluctuation Prediction Unit 156 Water Distribution Plan Correction Unit 157 Operation Amount Calculation Unit

Claims (11)

A demand forecasting unit for forecasting long-term changes in demand in the water distribution network;
A flow rate planning unit for planning a flow rate of a plurality of water distribution stations based on the prediction of the demand amount;
A control mode planning unit that develops a control mode plan for each of the plurality of water distribution stations based on the flow rate plan;
A demand fluctuation forecasting unit for forecasting short-term fluctuations in demand in the water distribution network;
A unit increase / decrease condition storage unit that stores the number of installed pumps of each of the plurality of water distribution stations and the increase / decrease condition of the number of pumps operated;
Based on the increase / decrease condition of the number of pumps operated, the short cycle fluctuation prediction of the demand amount and the flow plan, the range of the long period variation and short cycle fluctuation of the water distribution amount of each water distribution station is predicted, and the demand amount A distribution plan correction unit that corrects the flow rate plan of each distribution station so that the distribution amount of other distribution stations is changed rather than increasing or decreasing the number of pumps operated against the long-term change of the distribution amount in the distribution stations that bear short-term fluctuations When,
An operation amount calculation unit that calculates a control command for each water station that follows the corrected flow rate plan and optimizes the pressure in the water distribution network,
A water distribution operation control apparatus comprising: a transmission unit that transmits the control command to each water distribution station. The water distribution operation control device according to claim 1,
It has a hydraulic analysis calculation unit that performs hydraulic analysis calculation to estimate the pressure at the nodes in the distribution pipe network and the flow rate of the pipeline,
The control mode planning section
Based on the results of the hydraulic analysis calculation, extract control points that focus pressure management in the distribution pipe network,
Further, based on the sensitivity analysis of the hydraulic analysis calculation, select a water distribution station that most effectively adjusts the pressure at the control point, and the selected water distribution station is a water distribution station that controls the pressure in the distribution pipe network. A water distribution operation control apparatus that sets the control mode plan by setting and setting another water distribution station as a water distribution station that controls the water distribution flow rate following the flow rate plan. The water distribution operation control device according to claim 1,
The water distribution plan correction unit
In the water station responsible for short-term fluctuations in the demand,
Although the long-term change in water distribution is not an increasing trend, the actual water distribution trend of the water distribution station is increased, and when it is predicted that the pump will be stopped during the predicted short-term fluctuation, Rather than starting the pump, the flow plan is corrected by decreasing the flow plan value of the water station and increasing the flow plan value of the other water station so as to increase the water volume of the other water station. A water distribution operation control device. The water distribution operation control device according to claim 1,
The water distribution plan correction unit
In the water station responsible for short-term fluctuations in the demand,
Although the long-term change in water distribution is not a decreasing trend, when the actual water distribution trend of the water distribution station decreases and it is predicted that the operating pump will be stopped with the predicted short-term fluctuation, the operating Rather than stopping the pump, it is necessary to correct the flow plan by increasing the flow plan value of the water station and decreasing the flow plan value of the other water station so as to reduce the water distribution amount of the other water station. A water distribution operation control device. The water distribution operation control device according to claim 1,
The water distribution plan correction unit
In the water station responsible for short-term fluctuations in the demand,
It is predicted that the operating pump will be stopped due to a decreasing trend of the long-term change in the water distribution amount, and the predicted short-term fluctuation is added to the actual water distribution trend, assuming that the operating pump is stopped. Sometimes a correction amount for suppressing the start of the stopped pump against the long-cycle change is calculated, and when the magnitude of the correction amount is equal to or less than a predetermined amount, the operating pump is immediately stopped. A water distribution operation control device, wherein the flow rate plan is corrected by decreasing the flow rate plan value of the water distribution station and increasing the flow rate plan value of another water station so as to be able to do so. The water distribution operation control device according to claim 1,
The water distribution plan correction unit
In the water station responsible for short-term fluctuations in the demand,
It is predicted that the long-term change of the water distribution will start with the increasing trend, and the pump that is stopped will be started.If the stopped pump is started, the predicted short-term fluctuation was added to the actual water distribution trend. Sometimes a correction amount for suppressing stopping of the pump during operation contrary to the long-cycle change is calculated, and when the amount of the correction amount is equal to or smaller than a predetermined amount, the pump during stoppage is quickly started. The water distribution operation control apparatus, wherein the flow rate plan value is corrected by increasing the flow rate plan value of the water distribution station and decreasing the flow rate plan value of another water station so as to be able to do so. The water distribution operation control device according to claim 1,
It has an actual water distribution storage unit that stores past actual demand data,
The demand fluctuation prediction unit
Based on the actual demand data,
When forecasting short-term fluctuations in the demand amount, only the data of the section including the same time as the time of forecasting the fluctuation and the same day of the week is used, and the predicted demand amount and the actual demand amount in the section including the time are used. A water distribution operation control apparatus, wherein the fluctuation is predicted using only data in which the difference falls within a predetermined range. The water distribution operation control device according to claim 1,
Connected to a plurality of facilities to be controlled and monitored including the water distribution station via a communication network, received measurement data related to the operating state from the plurality of facilities, and received the control command value calculated by the manipulated variable calculator. The water distribution operation control device, wherein the facility is transmitted to the plurality of facilities, and the controlled facility controls the facilities to follow the control command value. A program executed by a water distribution operation control device for controlling a water distribution station,
The water distribution operation control device
A demand forecasting unit for forecasting long-term changes in demand in the water distribution network;
A flow rate planning unit for planning a flow rate of the water distribution station based on the prediction of the demand amount;
A control mode planning unit for planning a control mode of the water distribution station based on the flow rate plan;
A demand fluctuation forecasting unit for forecasting short-term fluctuations in demand in the water distribution network;
Number increase / decrease condition storage unit storing the number of pumps installed in the water distribution station and the increase / decrease conditions of the number of pumps operated,
Based on the increase / decrease condition of the number of pumps operated, the short cycle fluctuation prediction of the demand amount and the flow plan, the range of the long period variation and short cycle fluctuation of the water distribution amount of each water distribution station is predicted, and the demand amount A distribution plan correction unit that corrects the flow rate plan of each distribution station so that the distribution amount of other distribution stations is changed rather than increasing or decreasing the number of pumps operated against the long-term change of the distribution amount in the distribution stations that bear short-term fluctuations When,
An operation amount calculation unit that calculates a control command for each water station that follows the corrected flow rate plan and optimizes the pressure in the water distribution network,
A program that operates as a transmission unit that transmits the control command to each water station. A demand forecasting unit for forecasting long-term changes in demand in a water distribution network provided with a plurality of water distribution stations;
A demand fluctuation forecasting unit for forecasting short-term fluctuations in demand in the water distribution pipe network;
A unit increase / decrease condition storage unit that stores the number of installed pumps of each of the plurality of water distribution stations and the increase / decrease condition of the number of pumps operated;
A flow rate planning unit for planning the number of pumps operated and the flow rate of the plurality of water distribution stations based on the prediction of the demand prediction unit and the increase / decrease conditions of the unit increase / decrease condition storage unit;
Based on the prediction result of the demand fluctuation prediction unit and the increase / decrease condition of the unit increase / decrease condition storage unit, instead of increasing / decreasing the number of pumps operating at the water station responsible for short-term fluctuation of the demand amount, A water distribution plan correction unit that corrects the plan of the flow rate planning unit of each water distribution station to be changed;
An operation amount calculation unit for calculating a control command for each water station that follows the corrected plan and optimizes the pressure in the water distribution network,
A water distribution operation control apparatus comprising: a transmission unit that transmits the control command to each water distribution station.
The water distribution operation control device according to claim 11,
The water distribution plan correction unit increases or decreases the number of pumps operating at the water distribution station that is responsible for short-term fluctuations in the demand amount when the prediction result of the demand fluctuation prediction unit cannot be satisfied within the possible range of changing the water distribution amount of other water distribution stations. A water distribution operation control device that corrects the plan of the flow rate planning section of each water distribution station.

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