JP5932466B2 - Water distribution operation control device - Google Patents

Description

  It relates to water distribution operation control equipment.

  Patent Document 1 realizes a water distribution control system that simulates the state of a water distribution pipe network using real-time process data, and automatically calculates and sets the optimum operation amount for each operation point including each water distribution injection point. The technology to do is described.

JP 2006-104777 A

  In the water distribution control system of Patent Document 1, it is difficult to precisely calculate the operation amount that appropriately maintains the pressure in the water distribution pipe network when the demand changes greatly in a short period of time. Therefore, for example, the pump discharge pressure at the water distribution station is set higher with a margin, and there may be a loss of pump power consumption.

  In order to solve the above problems, for example, a data collection unit that collects the state of the distribution pipe network to be controlled, a demand prediction unit that predicts the demand amount in the distribution pipe network, and the operation of the water distribution station based on the demand amount prediction A distribution plan planning department that formulates a plan, and a control command for each distribution station that follows the distribution plan and optimizes the pressure in the distribution pipe network, and an operation amount that sends the operation amount to the distribution station at a normal control cycle A calculation unit, a threshold for determining a sudden change in demand based on an operation amount, a sudden change correction data calculation unit for calculating a correction formula for calculating an operation amount at the time of a sudden change, a threshold value and a data collection unit calculated by the sudden change correction data calculation unit An abrupt change determination unit that determines a sudden change in demand amount using sensor information from the input, a sudden change operation amount calculation unit that calculates an operation amount based on a correction formula when the sudden change determination unit determines a sudden change in demand, and a control command Transmission to each water station With the door, sudden change determination unit, when it is determined that the demand sudden change includes a short control cycle than the control cycle by sending a manipulated variable on the.

  ADVANTAGE OF THE INVENTION According to this invention, the water distribution operation control apparatus which controls the pressure in a water distribution pipe network precisely and contributes to energy saving and cost saving can be provided.

It is a figure which shows the structural example of 1st embodiment 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 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 which shows the controllable range of the flow volume and total head in a water distribution station resulting from the pump capability recorded on an analysis condition memory | storage part. It is a figure explaining selection of the control point in the distribution pipe network recorded on a pressure control law storage part. It is a figure which shows the increase / decrease conditions of the pump operation number of the water distribution station recorded on a unit increase / decrease condition memory | storage part. It is a table showing the change of the pressure when the amount of water distribution calculated by the process of a sudden change correction data calculation part changes, and the change of required discharge pressure. It is a figure which shows the calculation timing of the operation amount by the water distribution operation control apparatus at the time of a demand amount changing suddenly. It is a figure which shows the calculation method of the discharge pressure of a pump facility by the operation amount calculation part at the time of sudden change. It is a figure which shows the flowchart of operation amount determination of the water distribution operation control apparatus by the sudden change determination part. It is a figure which shows arrangement | positioning of the flow volume distribution of the hydraulic analysis sample recorded on a hydraulic analysis sample storage part. It is a table which shows the data content of the hydraulic analysis sample recorded on a hydraulic analysis sample storage part. It is a figure which shows the approximation of the water distribution pump facility power consumption data in the process of a hydraulic analysis sample part. It is a flowchart which shows the process of a hydraulic analysis approximation part. It is a figure which shows the structural example of 2nd embodiment 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 2nd embodiment of the water distribution operation control apparatus.

  Hereinafter, the first embodiment will be described in detail with reference to the drawings using examples.

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

  The water distribution operation control device 101 includes a hydraulic analysis calculation unit 141, an analysis condition storage unit 142, a pressure control law storage unit 143, a water distribution plan storage unit 144, an operation amount calculation unit 151, and a sudden change correction data calculation unit 152. A sudden change determination unit 154, an abrupt change manipulated variable calculation unit 155, a water distribution plan planning unit 161, a hydraulic analysis sample unit 162, a hydraulic analysis sample storage unit 163, a hydraulic analysis approximation unit 164, a demand A prediction unit 165, an operation condition storage unit 166, a data collection unit 171, and a transmission unit 172 are included.

  The objects controlled by the water distribution operation control device 101 are the water distribution station A and the water distribution station B. In this embodiment, only the water distribution station is controlled.For example, in a distribution pipe network including a facility having a valve, a booster pump, an elevated tank, etc. as a control target of the water distribution operation control device, Call. 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 two water distribution stations A and B to the water distribution network 111, and a remote sensor 112 and a remote sensor 113 are installed to monitor the state in the water distribution network 111. .

  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 includes a water distribution reservoir 131, a control device 132, a water distribution pump facility 133, and a sensor 134. 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.

  The control device of each water distribution station and each remote sensor are connected to the water distribution operation control device 101 via a communication network. The sensors at the water distribution stations and the remote sensors transmit the measured sensor data to the data collection unit 171 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 172 of the water distribution operation control apparatus 101 to each water distribution station.

  The hydraulic analysis calculation unit 141 receives analysis condition data from any one of the operation amount calculation unit 151, the operation amount calculation unit 151, and the sudden change correction data calculation unit 152 and receives the analysis condition data as an input, and the distribution pipe recorded in the analysis condition storage unit 142 Information such as the model of the network 111, the set demand demand output from the hydraulic analysis sample unit 162 as information on the demand quantity of the water distribution network 111, or the control point estimated demand quantity configured by the manipulation quantity calculation section 151, and the manipulation quantity calculation Pressure at the nodes of the distribution pipe network as an output by the process of performing the hydraulic calculation of the water distribution pipe network using the calculation conditions received from any of the unit 151, the manipulated variable calculation unit 151, and the sudden change correction data calculation unit 152 Then, the flow rate of the pipeline of the distribution pipe network and the estimated value of the change in the water level of the distribution reservoir are calculated, and the manipulated variable calculator 151, manipulated variable calculator 151 or sudden change correction data calculator of the data transmission source To send to the 52.

  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. Since hydraulic calculation is a known technique, details are omitted.

  The analysis condition storage unit 142 is a model of the distribution pipe network 111 that is an input to the hydraulic analysis calculation unit 141. The connection relation of the pipelines constituting the distribution pipe network, the diameter, length, and flow velocity coefficient of each pipeline. A water distribution network model consisting of the spatial distribution of demand is constructed and stored as hydraulic analysis conditions. Moreover, the information regarding the controllable range of the water distribution station resulting from the installed pump capacity is stored. The controllable range will be described later with reference to FIG.

  The pressure control law storage unit 143 records information related to the control law related to the control of the water distribution pipe network pressure by the water distribution operation control apparatus 101. For example, the setting method of the control mode of the water distribution station, the selection method of the control point in the water distribution pipe network, etc. are recorded.

  The control mode of the water distribution station is composed of a flow rate control mode for controlling the water distribution amount with the target distribution value 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.

  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. A water distribution station controlled in the pressure control mode is called a pressure control water distribution station, and a water distribution station controlled in the flow control mode is called a flow control water distribution station. In the case where 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 apparatus 101, there is not one water distribution station in the pressure control mode. There are cases where it is appropriate to set more than one.

  The control point selection method will be described later with reference to FIG.

  The operation amount calculation unit 151 and the hydraulic analysis sample unit 162 determine the operation amount to be transmitted to the control device of each water distribution station based on the information of the same pressure control law recorded in the pressure control law storage unit 143, This is used for the approximate calculation of the hydraulic analysis result used by the water distribution planning unit 161.

  The demand prediction unit 165 and the water distribution plan planning unit 161 have a function of planning a water distribution plan.

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

  In the distribution pipe network including elevated tanks, it is necessary to determine not only the shared water distribution plan but also the water level of the elevated tank.

  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 and the water distribution station B distributes water so as to share and supply the demand amount of the distribution pipe network 111. When formulating a water distribution plan, the amount necessary to determine the state of the water distribution pipe network will be collectively referred to as the water distribution state. Specifically, the amount of water distributed by each distribution station or the flow rate of the flow control valve and the water level of the elevated tank in the distribution pipe network including the elevated tank are the amount that constitutes the distribution state. If there is a booster pump that performs on / off control in the distribution pipe network, it is desirable to include the on / off state of the booster pump in the distribution state. In the present embodiment, the water distribution state is composed of the water distribution amount of the water distribution station A and the water distribution amount of the water distribution station B.

  The demand forecasting unit 165 uses the past and present actual water distribution data as input, and, for example, uses the past actual water distribution data to construct a regression equation that predicts the future demand from the past and present water distribution. The process of substituting the data of the actual water distribution necessary for the regression equation is performed, and the demand forecast in the distribution pipe network during the planning period, that is, the demand forecast quantity averaged from 30 minutes to one hour is output, and the water distribution plan planning It transmits to the part 161. 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 forecasting unit 165 treats the actual water distribution amount data as the actual demand amount data. Since the process which performs demand prediction can utilize a well-known technique, it abbreviate | omits for details.

  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 water distribution plan planning unit 161 receives the demand forecast amount calculated by the demand prediction unit 165, the conditions to be satisfied by the water distribution plan stored in the operation condition storage unit 166, and the evaluation function of the water distribution plan, and distributes water during the planning period. The water distribution plan that is the operation plan of the station is output. The plan of the shared water distribution amount that is an output will be described later together with the recorded contents of the water distribution plan storage unit 144 in the description of FIG.

  When there is an elevated tank in the water distribution system to be controlled by the water distribution operation control apparatus 101, the water level of the elevated tank and its inflow / outflow amount are also included in the plan.

  In the process of the water distribution planning unit 161, the distributed water distribution amount at each time of the planning period is used as a decision variable, and is described as an optimization problem that minimizes the evaluation function recorded in the operation condition storage unit 166. For example, a genetic algorithm Using an optimization technique such as the above, the search variable is searched within the range of conditions to be satisfied by the water distribution plan recorded in the operation condition storage unit 166, and the distribution of the output is performed by solving the optimization problem. Get the plan as the optimal solution.

  As the evaluation function stored in the operation condition storage unit 166, for example, a function obtained by adding an index value that can be calculated from the state of the water distribution network, such as the sum of pump power consumption of all water distribution stations, can be used.

  The description as an optimization problem and its solution are omitted here because various known techniques can be adopted.

  When calculating the value of the evaluation function, the water distribution plan drafting unit 161 picks up candidates for the water distribution plan, gives the water distribution plan as an input to the hydraulic analysis approximation unit 164 described later, and performs an approximate calculation of the hydraulic analysis, The estimated value of the state of the water distribution pipe network necessary for making the water distribution plan is acquired from the output of the hydraulic analysis approximating unit 164, and the value of the evaluation function is calculated using the estimated value of the state.

  The water distribution planning unit 161 determines the time series of the water distribution state, and the value of the evaluation function is calculated from the state of the water distribution pipe network at each time. For example, the pump power consumption can be evaluated by integrating (summing up) the power consumption of the water distribution station at each time during the planning period. The state of the distribution pipe network at each time does not necessarily need to be simulated by the hydraulic analysis calculation unit 141 in time series if appropriate information is given, and can be calculated independently at each time. In the example of the distribution pipe network 111, if the demand amount, the distribution amount of the distribution station A, and the distribution amount of the distribution station B are determined, each distribution station in the case of performing control under the conditions stored in the pressure control law storage unit 143. Discharge pressure, pressure at each point in the distribution pipe network, etc. are determined.

  As described above, the hydraulic analysis sample unit 162, the hydraulic analysis sample storage unit 163, and the hydraulic analysis approximation unit 164, which will be described later, are provided on the assumption that the state of the distribution pipe network can be estimated independently at each time. It plays a role of approximating the state of the net without performing calculation by the hydraulic analysis calculation unit 141 every time. In addition to performing the evaluation independently at each time, the hydraulic analysis sample unit 162 executes the processing of the hydraulic analysis calculation unit 141 having a long calculation time independently of the processing of the water distribution plan planning unit 161. The calculation time of the water distribution planning unit 161 can be shortened.

  The calculation of the evaluation function value by the water distribution planning unit 161 is not necessarily performed only through the hydraulic analysis approximating unit 164. If only a small number of evaluations are performed, the hydraulic analysis calculating unit 141 has a more precise evaluation function. The value may be calculated. If it is a small number of times, the calculation of the evaluation function value can be refined without significantly affecting the calculation time of the water distribution plan. For example, when it is determined that the optimization calculation has almost converged to the optimal solution, the water distribution planning unit 161 analyzes the hydraulic function calculation unit 141 instead of the hydraulic analysis approximation unit 164 when calculating the evaluation function value thereafter. By sending the condition data, receiving the hydraulic analysis result from the hydraulic analysis calculation unit 141, and changing the calculation to calculate the evaluation function value based on the hydraulic analysis result, the optimal solution based on a more precise evaluation index It is also good to get.

  The water distribution plan storage unit 144 stores the water distribution plan calculated by the water distribution plan planning unit 161 and provides it to the operation amount calculation unit 151 as a target value of a control command to each water distribution station.

  As described above, the operation condition storage unit 166 records the conditions to be satisfied by the water distribution plan and the evaluation function of the water distribution plan. The conditions to be satisfied by the water distribution plan will be supplemented in the explanation of FIG.

  The hydraulic analysis sample unit 162 receives the information on the pressure control law defined in the pressure control law storage unit 143 as input, and the hydraulic analysis approximation unit 164 performs the hydraulic analysis on the water distribution state to be evaluated by the water distribution planning unit 161. In order to approximate these results, the hydraulic analysis result sampling process is performed as described later in the description of FIGS. 13 and 14, and the sampling result is recorded in the hydraulic analysis sample storage unit 163 as an output.

  The hydraulic analysis sample unit 162 can be executed independently of the water distribution planning process by the water distribution planning unit 161. If information in the analysis condition storage unit 142 and the pressure control law storage unit 143 is updated, processing is performed as needed to update data in the hydraulic analysis sample storage unit 163.

  The hydraulic analysis sample storage unit 163 records the sampling result of the hydraulic analysis calculation that is the output of the hydraulic analysis sample unit 162, and provides information to the hydraulic analysis approximation unit 164. The recorded contents will be described later with reference to FIG. 13, FIG. 14 and FIG.

  The hydraulic analysis approximating unit 164 receives the distribution status information from the water distribution planning unit 161 and the calculation result of the hydraulic analysis recorded in the hydraulic analysis sample storage unit 163, and inputs the vicinity of the given distribution status. The hydraulic analysis sample result is extracted, and the sample result is numerically interpolated to output an approximate value of the calculation result of the hydraulic analysis in a given distribution state, and to the water distribution planning unit 161 Send.

  Details of the processing of the hydraulic analysis approximation unit 164 will be described later with reference to FIG.

  The manipulated variable calculator 151, the sudden change correction data calculator 152, the sudden change manipulated variable calculator 155, and the sudden change determiner 154 have a function of calculating a control command to each water station based on the water distribution plan and the collected data. .

  The calculation of the control command (operation amount) and transmission to the water distribution station are performed at a cycle equivalent to or several times the collection cycle based on the cycle at which the data collection unit 171 collects new data. For example, when data from each water distribution station or remote sensor can be collected in a cycle of 1 minute, the calculation of the control command is performed in a cycle in the range of about 1 minute to 5 minutes.

  As described with reference to FIGS. 10 and 12, the control period is determined by the sudden change determination unit 154 to determine whether the change in the demand amount is within the normal range or suddenly, and is changed within the above range based on the determination.

  The operation amount calculation unit 151 receives the water distribution plan recorded in the water distribution plan storage unit 144 and the sensor measurement value at the time of control received from the data collection unit 171 as input, and follows the corrected water distribution plan while distributing the water distribution network 111. The control command (operation amount) which consists of the control mode and control target value of each water distribution facility to be controlled so as to keep the water distribution pressure within the appropriate range, and outputs the control command of each water distribution facility via the transmission unit 172 Send to.

  The control device of the water distribution station, for example, the control device 132 receives the control command from the transmission unit 172, 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 132 will be described later with reference to FIG.

  The operation amount in this embodiment is the discharge pressure of the pressure control water station and the discharge flow rate of the flow control water station. In a distribution pipe network having a secondary pressure control valve as well as a water distribution station, the secondary pressure of the secondary pressure control valve can be handled as an operation amount if it corresponds to the discharge pressure of the pressure control water station. In addition, in a water distribution pipe network having a flow control valve, the flow rate of the flow control valve can be treated as an operation amount assuming that it corresponds to the discharge flow rate of the flow control water distribution station.

  As a method for determining the control mode, any method recorded in the pressure control law storage unit 143 can be used. For example, one water station can be fixed in the pressure control mode, and the other water station can be fixed in the flow rate control mode. In addition, depending on the position of the control point at the time of control, it may be possible to select a predetermined water distribution station as the pressure control mode.

  For example, the following technique can be used for the calculation process of the control command. For example, a water distribution station in a flow rate control mode is fixed to distribute water according to a water distribution plan value, and the discharge pressure of the water distribution station in the pressure control mode, which is the operation amount to be obtained, is set as a search variable. With the operation method of the water distribution station in both control modes as an input, a decision variable is determined so as to minimize an objective function value described later obtained from the hydraulic analysis calculation result output by the hydraulic analysis calculation unit 141.

  As the objective function, an amount of deviation from a preset appropriate range of the pressure value calculated by the hydraulic analysis calculation unit 141 at a control point described later can be selected. As a method for searching for an optimum decision variable, for example, a known optimization method such as a hill climbing simplex method can be applied.

  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 141, and the prediction from the demand prediction unit 165 is performed. Replace with value.

  When it is not determined that there is a sudden change in demand, the operation amount calculation unit 151 is executed with a period of 5 minutes (hereinafter referred to as a normal time control period), and is used to determine an appropriate operation amount according to the state of the distribution pipe network. . It can respond to daily demand changes in a cycle of 5 minutes. By taking a longer period, the number of operation changes is reduced, and the control processing of the control device of the water distribution station is simplified.

  The sudden change correction data calculation unit 152 receives the operation amount determined by the operation amount calculation unit 151 as input, and determines a sudden change in the demand amount as the correction data 153 by processing using the result output by the hydraulic analysis calculation unit 141. Outputs the threshold value of the water distribution amount and a correction formula for calculating the manipulated variable at the time of sudden change.

  When the water supply facility is controlled with the manipulated variable, the correction formula is calculated when the sudden change determination unit 154 determines a sudden change in demand (hereinafter referred to as a sudden change) based on the threshold value. This is a correction formula used when the operation amount calculation unit 155 calculates the operation amount.

  Details of the processing of the sudden change correction data calculation unit 152 will be described later with reference to FIG.

  The correction data 153 is data calculated by the sudden change correction data calculation unit 152, and includes a threshold value of the water distribution amount of the pressure control water distribution station that determines sudden change, and an operation amount, that is, pressure control, by the sudden change operation amount calculation unit 155 at the time of sudden change in demand. It consists of a correction formula used when correcting the discharge pressure of a water distribution station.

  Details of the correction data 153 will be described later together with the description of FIGS. 9 and 11.

  The sudden change operation amount calculation unit 155 receives the correction data 153 and the information collected in the data collection unit 171 via the sudden change determination unit 154, and outputs an operation amount that appropriately maintains the pressure in the distribution pipe network. To do. The manipulated variable output from the manipulated variable calculation unit 155 at the time of sudden change overwrites the manipulated variable output from the manipulated variable calculator 151 and is transmitted to the control device of each water station via the transmission unit 172.

  Details of the processing of the sudden change operation amount calculation unit 155 will be described later with reference to FIG.

  The operation amount calculated by the sudden change operation amount calculation unit 155 in this embodiment is the discharge pressure of the pressure controlled water distribution station. As described above, the secondary pressure of the secondary pressure control valve can also be handled as an operation amount.

  When it is determined that there is a sudden change in demand and the operation amount is calculated by the operation amount calculation unit 155 at the time of sudden change, the control cycle is shortened to, for example, 1 minute in accordance with the data collection cycle from the data collection unit 171 (hereinafter, control cycle at the time of sudden change). Called). The sudden change operation amount calculation unit 155 calculates the operation amount based on the correction formula, and the calculation speed is sufficiently fast. If it is determined that there is a sudden change in demand, the operation amount can be calculated immediately and applied to the control of the water distribution station. it can.

  The sudden change determination unit 154 receives the correction data 153 and the sensor information from the data collection unit 171, performs a process for determining a sudden change in the demand amount, and operates the operation amount calculation unit 151 and the sudden change operation amount calculation unit 155 according to the determination result. The sensor information data is transmitted as an operation amount calculation condition. Further, at the time of a sudden change, the sensor information data is transmitted to the manipulated variable calculator 151 as a correction data update condition so that the correction data 153 is updated.

  The sudden change determination unit 154 determines a sudden change in demand every minute, for example, when information necessary for the determination from the data collection unit 171, that is, data on the amount of water distribution in the pressure controlled water distribution station is collected.

  Details of the processing of the sudden change determination unit 154 will be described later with reference to FIG.

  The data collection unit 171 collects the state of the water distribution pipe network 111 as sensor information and other transmission information from each water distribution station and each remote sensor.

  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.

  The control device of each water distribution station, for example, the control device 132 also has the same hardware configuration as the water distribution operation control device 101.

  FIG. 3 is a configuration diagram of the equipment and control device of the water distribution station B in the first embodiment. The water distribution pump facility 133 includes a pump 1801, a pump 1802, and a discharge valve 1811 and a discharge valve 1812 installed at the discharge port of each pump.

  The pump 1801 and the pump 1802 are installed with inverters, and are variable speed pumps that can change the pump rotation speed in accordance with a control signal received from the control device 132. Each discharge valve can change the opening according to a control signal received from the control device 132.

  The transmission signal 340 is a signal transmitted from the transmission unit 172 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 132 receives the measurement value of the transmission signal 340 and the sensor 134 as an input, and uses the control unit of the control mode specified by the transmission signal 340 to distribute the water distribution pump equipment 133 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 134 measures the discharge pressure and discharge flow rate (distribution flow rate) of the water distribution station B and transmits them to the control device 132.

  The number-of-units increase / decrease condition storage unit 365 stores a condition for switching the number of pumps to be operated in a water distribution station that performs control by changing the number of pumps to be 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.

  The pressure control unit 331 receives the discharge pressure control target value of the transmission signal 340 and the measurement value of the sensor 134 as input, and increases or decreases the number of pumps whose discharge pressure control target value and the measurement value are recorded in the number increase / decrease condition storage unit 1865. 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 number of rotations of the variable speed pump and the opening of the discharge valve are output, via the transmission unit 1850 It transmits to the water distribution pump equipment 133 and changes the operation state of each equipment.

  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 134 as input, and the pump flow rate control target value and the measured value increase / decrease the number of pumps recorded in the number increase / decrease condition storage unit 1865. 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 number of rotations of the variable speed pump and the opening of the discharge valve are output, via the transmission unit 1850 It transmits to the water distribution pump equipment 133 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 144. 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 water distribution amount and control points for each water station are determined for each time. .

  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 Is given in In addition, control points described later in FIG.

  FIG. 5 is a table showing the upper and lower limit values of the accumulated water distribution amount of the water distribution stations recorded in the operation condition storage unit held in the operation condition storage unit 166. 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. 6 described later should satisfy, but the table in FIG. 5 gives a constraint on the accumulated 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 water distribution plan planning unit 161 can contribute to the compliance with the contract by searching for candidates for the water distribution plan within a range satisfying the conditions of this table.

  FIG. 6 is a diagram showing a controllable range of the flow rate and the total head in the water distribution station due to the pumping capacity recorded in the analysis condition storage unit 142. A description will be given by taking the water distribution station B shown in FIG. 3 as an example. The area shaded in the controllable area 601 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 is 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 is the parallel when all the pumps (2 variable speed pumps) are operated at the maximum speed. It is a pump capacity characteristic.

  The analysis condition storage unit 142 holds controllable range information for each water distribution station. The hydraulic analysis calculation unit 141 evaluates the deviation from the controllable range of the operation state of the water distribution station, and transmits the presence or absence of the deviation to the transmission source of the analysis condition data.

  FIG. 7 is a diagram illustrating selection of control points in the distribution pipe network in which the selection method is recorded in the pressure control law storage unit 143. 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. Therefore, at each time during the planning period, a point where pressure is preferentially managed in the water distribution pipe network is extracted as a control point. For example, from the calculation result of the hydraulic analysis calculation unit 141, one node having the lowest pressure is selected as a 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 diagram showing an increase / decrease condition of the number of pumps operating at the water distribution station. These conditions are stored in the number increase / decrease condition storage unit 1865 of the control device 132.

  FIG. 8A shows the number increase / decrease condition 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 “1 unit → 2 units”, the control device of the water distribution station stops the pump 1 so as to increase the number of pumps from one to two. 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.

  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 of “1 unit → 2 units” is set larger than the flow rate threshold of “2 units → 1 unit”.

  In addition, FIG. 8 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 132 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. In addition, the hydraulic analysis sample unit 162 of the water distribution operation control apparatus 101 calculates the number of operating water pumps by referring to the same number increase / decrease condition, and uses it to estimate the pump power consumption of each water distribution station.

  FIG. 9 shows the change in the pressure at the control point, which is calculated by the process of the sudden change correction data calculation unit 152, and the pressure control water station necessary for keeping the pressure at the control point constant. It is a table showing the change of discharge pressure. Although there are a plurality of pressure control water station candidates and control point candidates, the sudden change correction data calculation unit 152 is a table for one pressure control water station and one control point selected by the operation amount calculation unit 151. Build up.

  In the processing of the sudden change correction data calculation unit 152, the state in which the demand amount is changed from the reference state is transmitted to the hydraulic analysis calculation unit 141 based on the state of the operation amount output from the operation amount calculation unit 151. The amount of change from the reference pressure of the control point in the hydraulic analysis calculation result received from the analysis calculation unit 141 is calculated.

  Similarly, after changing the demand amount from the reference, the state in which the discharge pressure is variously changed with respect to each demand amount change is transmitted to the hydraulic analysis calculation unit 141 for each condition of the demand amount change. In the hydraulic analysis result received from the hydraulic analysis calculation unit 141, the setting of the discharge pressure that can keep the pressure at the control point equal to the reference is selected, and the amount of change from the reference of the discharge pressure of the pressure control water distribution station Calculate

  In FIG. 9, the type information 901 is a type indicating whether the demand amount has been increased or decreased from the reference, the water distribution amount of the pressure control water distribution station is the water distribution amount information 902, and the pressure change amount of the control point is the control point pressure change amount. The information 903 is a table showing the discharge pressure change amount necessary for maintaining the control point pressure in the required discharge pressure change amount information 904.

  From these results, the sudden change correction data calculation unit 152 calculates the correction data 153 as follows, for example. Coefficients k, n, kc, and nc are determined by using the least square method so that the following two expressions are best fitted to the table information.

Hd−H0 = k × (Qd ^ n−Q0 ^ n)
Hc−Hc0 = −kc × (Qd ^ nc−Q0 ^ nc)
However,
Qd: value of water distribution information 902,
Hd−H0: value of required discharge pressure change amount information 904,
Hc-Hc0: value of control point pressure change amount information 903,
Q0: Standard water distribution,
H0: Reference discharge pressure Hc0: Reference control point pressure. X ^ y represents x to the power of y.

Then, if the allowable range of pressure change at the control point is ± 3 m, the threshold value of the water distribution amount for determining a sudden change in demand is determined by the following equation.
−3 = −kc × (QdH ^ nc−Q0 ^ nc)
+ 3 = −kc × (QdL ^ nc−Q0 ^ nc)
However,
QdL: determination threshold (lower limit) for sudden change in demand,
QdH: Threshold for sudden change in demand (upper limit)
It is.

The correction data 153 includes a correction calculation formula representing a change in the required discharge pressure,
Hd = (H0−k × Q0 ^ n) + k × Qd ^ n (Formula 1)
And determination threshold values QdL and QdH for sudden change in demand. Among the coefficients that determine the correction formula, n, which is a multiplier of the water distribution amount, is also determined as variable from the hydraulic analysis calculation at the time of correction data calculation.

  The method of calculating the discharge pressure by the sum of the term proportional to the power of the water distribution amount and the constant term as in Equation 1 is called an estimated terminal pressure constant control method. The correction formula described here is a correction formula based on the estimated terminal pressure constant control, and is a technique for deriving the parameters from the result of the hydraulic analysis calculation.

  The configuration method of the correction data 153 is not limited to this example. For example, the determination threshold for sudden change in demand may be fixedly set to ± 2% from the reference. Further, another method may be used for the discharge pressure correction calculation formula and the coefficient derivation method.

FIG. 10 is a diagram illustrating the calculation timing of the operation amount by the water distribution operation control device when the demand amount suddenly changes.
When the change in the amount of water distribution at the pressure controlled water distribution station falls within the determination threshold for sudden change in demand (shaded area in the figure) of the correction data 153, the sudden change determination unit 154 determines that the change in demand is normal and normal for 5 minutes. The operation amount is transmitted by the operation amount calculator 151 at the time control period.

  When the change in the water distribution amount deviates from between the determination thresholds, the pressure at the control point is expected to change beyond the allowable range, so the sudden change determination unit 154 determines that the demand is changing rapidly. When it is determined that there is a sudden change in demand, the manipulated variable calculation unit 155 at the time of sudden change calculates the manipulated variable using the correction calculation formula of the correction data 153, and the manipulated variable is transmitted to each water distribution station. The calculation of the operation amount by the sudden change operation amount calculation unit 155 is performed every one minute sudden change control cycle, and is transmitted to the water distribution station. Further, the manipulated variable calculation unit 151 and the sudden change correction data calculation unit also receive the correction data calculation condition from the sudden change determination unit 154 in a cycle (for example, 3 minutes, hereinafter referred to as an update cycle) shorter than the normal control cycle (5 minutes). The correction data 153 is updated.

When the change in demand continues to shift between the determination threshold values of the correction data 153, the sudden change in demand stops, and the sudden change determination unit 154 determines that the sudden change in demand has ended, and the control by the normal operation amount calculation unit 151 is started. Return.
The determination by the sudden change determination unit 154 and the calculation of the operation amount will be described later with reference to FIG.

FIG. 11 is a diagram illustrating a method for calculating the discharge pressure by the sudden change operation amount calculation unit 155. The correction calculation formula of the correction data 153 is expressed by Formula 1 as a curve passing through the reference manipulated variable according to the estimated terminal pressure constant control method. The sudden change operation amount calculation unit 155 calculates the operation amount (discharge pressure) at the sudden change from the correction calculation formula by substituting the measured value of the distribution flow rate.
Since this equation can be calculated instantaneously from the measured value of the water distribution, the control target value of the pump facility can be quickly corrected. However, when the change in the water distribution flow rate increases, there is a deviation from the value calculated by the operation amount calculation unit 151 that realizes more precise control. For this reason, the operation amount calculation unit 151 and the sudden change correction data calculation unit 152 are periodically executed to update the correction data 153. The update process of the correction data 153 will be described later with reference to FIG.

  FIG. 12 is a diagram illustrating a flowchart for determining the operation amount by the sudden change determination unit 154. Every time sensor data is collected by the data collection unit 171 every minute, the sudden change determination unit 154 supervises calculation of the manipulated variable according to the flowchart of FIG.

  In step 1202, the processing is switched with reference to the determination of sudden change in demand at the previous time. If it is the normal mode, the process proceeds to step 1203. If it is the sudden change mode, the process proceeds to step 1205.

  In step 1203, it is determined whether the water distribution amount measurement value from the data collection unit 171 is between the determination threshold values of the correction data 153. If it is between the threshold values, it is determined as normal, and if it is outside the threshold value, it is determined that the change is abrupt, and the process proceeds to step 1204.

  In step 1204, it is assumed that the current time has entered a sudden change in demand, and the mode is shifted to step 1205.

  In step 1205, the sudden change time operation amount calculation unit 155 calculates the operation amount using the correction calculation formula of the correction data 153 and the measured water distribution amount.

  In step 1206, the operation amount calculated by the sudden change operation amount calculation unit 155 is transmitted to the control device of each water distribution station via the transmission unit 172. Transmission is performed every sensor data collection cycle, that is, every control cycle at the time of sudden change.

  In step 1207, it is determined whether or not the measured water distribution value continues for the normal control cycle (5 minutes) or more of the operation amount calculation unit 151 between the determination threshold values of the correction data 153. If it is continuously within the threshold value, it is determined to return to normal, and the process proceeds to Step 1210. Otherwise, it is determined that the sudden change is continued, and the process proceeds to Step 1208.

  In step 1208, it is determined whether or not the update period (3 minutes) has elapsed since the last update of the correction data 153 by the operation amount calculation unit 151 and the sudden change correction data calculation unit 152. If it has elapsed, it is determined to be applicable, and the process proceeds to step 1209. If it has not elapsed, it is determined that it is not applicable, and the process proceeds to step 1214 to end the process.

  In step 1209, the manipulated variable calculation unit 151 and the sudden change correction data calculation unit 152 update the correction data 153, and the process proceeds to step 1214 to end the process.

  In step 1211, it is determined whether or not the normal control period (5 minutes) has elapsed since the last calculation of the operation amount by the operation amount calculation unit 151. If it has elapsed, it is determined to be applicable, and the process proceeds to step 1212. If it has not elapsed, it is determined that it is not applicable, and the process proceeds to Step 1213.

  In step 1212, the operation amount calculation unit 151 and the sudden change correction data calculation unit 152 calculate the operation amount and update the correction data 153, and the process proceeds to step 1213.

  In step 1213, the operation amount calculated by the operation amount calculation unit 151 is transmitted to the control device of each water distribution station via the transmission unit 172, and the process proceeds to step 1214 to end the process.

  By determining the sudden change in demand by the processing of the sudden change correction data calculation unit 152, the sudden change operation amount calculation unit 155, and the sudden change determination unit 154, the operation amount can be changed quickly with a correction method capable of high-speed calculation. , Pressure fluctuations in the distribution pipe network can be suppressed. In addition, the precise calculation of the operation amount using the hydraulic analysis calculation by the operation amount calculation unit 151 is also shortened from the normal 5 minutes to the shorter calculation period (update period) of 3 minutes, and the calculation formula of the correction method is updated. In this way, it is possible to control the pressure in the distribution pipe network precisely following large-scale changes in demand.

  FIG. 13 is a diagram showing an arrangement of flow distribution of hydraulic analysis samples recorded in the hydraulic analysis sample storage unit 163.

  The hydraulic analysis sample unit 162 seems to have sufficient accuracy, for example, within 2%, within the range of the distribution state that can be set as a decision variable by the water distribution plan planning unit 161 by the hydraulic analysis approximation unit 164 described later. In addition, the distribution state to be sampled is determined so as to cover the range of the distribution state with points at regular intervals. Specifically, the apparatus coordinator may evaluate the accuracy during the trial operation of the water distribution operation control apparatus 101 and appropriately determine the interval.

  FIG. 13 shows the arrangement of samples in the distribution pipe network 111 that distributes water from the distribution stations A and B. Since the demand amount is the sum of the water distribution amounts of the two water stations, the straight line Qa + Qb = (constant) represents the distribution for the same amount of demand.

  A distribution state that does not satisfy the constraint condition recorded in the analysis condition storage unit 142 or the pressure control law storage unit 143 is indicated by an oblique cross, and a distribution state that satisfies the constraint condition is indicated by a circle. Recording of information as to whether or not the constraint condition is satisfied will be described later with reference to FIG.

  Further, the flow distribution for which the hydraulic analysis approximating unit 164 obtains the hydraulic analysis result is illustrated by triangular marks, and the neighboring sampling points used by the hydraulic analysis approximating unit 164 for interpolation are surrounded by a broken-line square. The processing of the hydraulic analysis approximation unit 164 will be described later with reference to FIG.

  In this example, the sampling is a two-dimensional plane, but the water distribution operation control apparatus 101 for a distribution pipe network with more water distribution stations needs to sample from a higher dimensional space. In addition, when it is appropriate to include a discrete quantity such as pump on / off instead of a continuous quantity such as a water distribution station or a tank water level in the constituent quantity of the distribution state, the discrete quantity is all combinations. It is always desirable to perform sampling.

  When the number of amounts constituting the water distribution state is not large as in this embodiment, sufficient approximation accuracy can be obtained only by linear interpolation of the sampling result.

  FIG. 14 is an example of a table showing the data contents of the hydraulic analysis sample recorded in the hydraulic analysis sample storage unit 163. The hydraulic analysis sample storage unit 163 records such table information for each sampling point shown in FIG.

  The items to be recorded in the table may be the minimum necessary for the water distribution planning unit 161. For example, only the distribution station A flow rate, the distribution station B flow rate, the satisfaction of the constraint conditions, the total power, and the control point can be recorded.

  The hydraulic analysis sample unit 162 performs hydraulic analysis calculation on the sampling points described in the explanation of FIG. 13 according to the information of the pressure control law recorded in the pressure control law storage unit 143, and records the result in this table. . For the water distribution state to be sampled, control points are extracted according to the pressure control law, and the discharge pressure of each water distribution station with the pressure at the control point as a target value is determined from hydraulic analysis calculation. Moreover, the power consumption of each water distribution station is calculated from the discharge pressure. The calculation of power consumption will be supplemented in the description of FIG. It is determined that the constraint condition is satisfied when the water distribution amount and the discharge pressure of the water distribution station are within the controllable range of FIG. 6 and satisfy other constraint conditions to be satisfied. The hydraulic analysis calculation result and the determination result are combined and recorded in the hydraulic analysis sample storage unit 163.

  FIG. 15 is a diagram showing an approximation of the power distribution facility power consumption data in the processing of the hydraulic analysis sample unit 162. As described with reference to FIG. 8, the number of pumps operating in the distribution pump facility is not uniquely determined only by the distribution flow rate at the time, but has hysteresis depending on the transition of the distribution flow rate. Therefore, the power consumption calculated by the hydraulic analysis sample unit 162 is not uniquely determined only by the flow rate sharing as shown in FIG. 15A, but is finally determined uniquely by determining the number of pumps to be operated.

  Therefore, the hydraulic analysis sample unit 162 approximates so that the power consumption is uniquely determined from the flow rate as shown in FIG. For example, for an area where two types of pumps can be operated, the area is approximated so as to be smoothly connected by an S-shaped curve.

  Since the water distribution plan is planned based on the prediction result of the demand prediction unit 165, an error occurs between the demand prediction at the time of planning and the demand at the time of control. For this reason, errors due to the hysteresis of the number of pumps in operation cannot be avoided, and the errors due to the approximation do not have a significant effect.

  In addition, regarding the approximation of hysteresis, it is possible to evaluate strict pump power consumption without performing the approximation in a period in which the demand prediction of the demand prediction unit 165 is more certain. It is conceivable that the hydraulic analysis calculation unit 141 is combined with a method for precisely calculating the evaluation function value.

  For example, when the water distribution plan planning unit 161 determines that the optimization calculation has converged to an almost optimal solution, the water distribution plan planning unit 161 uses the hydraulic analysis approximation unit 164 instead of the hydraulic analysis approximation unit 164 when calculating the evaluation function value thereafter. The analysis condition data is transmitted to the analysis calculation unit 141, the hydraulic analysis result is received from the hydraulic analysis calculation unit 141, and the evaluation function value is calculated based on the hydraulic analysis result. It is also possible to obtain a water distribution plan that precisely minimizes the power consumption by precisely calculating the power consumption in consideration of the influence of the hysteresis during the most recent 3 hours from the probable planning time.

  FIG. 16 is a flowchart showing the processing of the hydraulic analysis approximating unit 164.

  In step 1602, sampling points in the vicinity of the distribution state given by the distribution plan planning unit are extracted from the hydraulic analysis sample storage unit 163.

  In step 1603, it is determined whether the hydraulic analysis results of all sampling points extracted in step 1602 satisfy the constraint conditions. If all points are satisfied, go to step 1604. Otherwise, go to step 1605.

  In step 1604, an approximate value of the result of the water distribution state is calculated by interpolating the result of the extracted sampling points. In the case of the example shown in FIG. 13, an approximate value is obtained by bilinear interpolation of the results of four sampling points surrounding the water distribution state. Even in the case of higher dimensions, interpolation can be performed from the results of neighboring sampling points by performing an interpolation method that is an extension of bilinear interpolation, that is, interpolation processing that repeats linear interpolation for each quantity. Since bilinear interpolation is a known technique, detailed description thereof is omitted. It is determined that the flow rate distribution satisfies the constraint condition, the result obtained by interpolation is output, and the process ends.

  In step 1605, it is determined that the flow rate distribution cannot satisfy the constraint condition, the result is output, and the process ends.

  A second embodiment will be described with reference to the drawings.

  FIG. 17 is a diagram illustrating a configuration example of the second embodiment of the water distribution operation control device. The difference from the first embodiment is that the sudden change determination unit and the sudden change operation amount calculation unit are not the water distribution operation control device 1701 but the control device 1722 and the control device 1732 which are control devices of the water distribution station. .

  FIG. 18 is a configuration diagram of the equipment and control device of the water distribution station B in the second embodiment. The structure corresponding to the sudden change determination unit 154 and the sudden change operation amount calculation unit 155 in the first embodiment is the water supply station control device 1732 as the sudden change determination unit 1854 and the sudden change operation amount calculation unit 1855. Along with this change, not only the operation amount but also the correction data 153 is transmitted to the control device of the water distribution station. Also, an instruction to update the correction data 153 from the sudden change determination unit 1854 is transmitted as a transmission signal 1841 from the distribution station control device to the water distribution operation control device 1701 via the network.

  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.

DESCRIPTION OF SYMBOLS 101 Water distribution operation control apparatus 141 Hydraulic analysis calculation part 151 Manipulation amount calculation part 152 Sudden change correction data calculation part 154 Sudden change determination part 155 Sudden change operation amount calculation part 161 Water distribution plan planning part 162 Hydraulic analysis sample part 163 Hydraulic analysis sample memory | storage Part 164 Hydraulic analysis approximation part

Claims (11)

A data collection unit that collects the status of the distribution pipe network to be controlled;
A demand forecasting unit for forecasting demand in the water distribution network;
A water distribution plan planning section that formulates an operation plan for the water distribution station based on the demand forecast;
An operation amount calculator that calculates a control command for each water station that optimizes the pressure in the distribution pipe network based on the water distribution plan, and transmits an operation amount to the water station at a normal control cycle;
A sudden change correction data calculation unit for calculating a threshold value for determining a sudden change in a demand amount based on the manipulated variable and a pressure change amount and a correction formula for calculating the manipulated variable at the time of a sudden change;
An abrupt change determination unit for determining a sudden change in demand amount by inputting the threshold value calculated by the sudden change correction data calculation unit and sensor information from the data collection unit;
An abrupt change operation amount calculation unit that calculates an operation amount based on the correction formula when the sudden change determination unit determines a sudden change in demand;
A transmission unit for transmitting the control command to each water distribution station,
When the sudden change determination unit determines that there is a sudden change in demand, the water distribution operation control device transmits the operation amount to the control cycle shorter than the control cycle. The water distribution operation control device according to claim 1,
When the sudden change determination unit determines that there is a sudden change in demand,
The sudden change correction data calculation unit further calculates the manipulated variable based on the threshold value and the correction formula. The water distribution operation control device according to claim 2,
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 manipulated variable calculation unit extracts a control point for preferentially managing pressure in the distribution pipe network based on the result of the hydraulic analysis calculation unit, and maintains the pressure at the control point at a predetermined target value. Calculate
The sudden change correction data calculation unit derives a correction formula that approximates an operation amount for maintaining the pressure at the control point at a predetermined target value. The water distribution operation control device according to claim 3,
The operation amount calculated by the abrupt change operation amount calculation unit is one of a pump discharge pressure of a water distribution station and a secondary pressure of a secondary pressure control valve. The water distribution operation control device according to claim 4,
The water supply operation control apparatus according to claim 1, wherein the operation amount correction formula calculated by the sudden change correction data calculation unit and used by the sudden change operation amount calculation unit is a correction formula based on the estimated terminal pressure constant control method. The water distribution operation control device according to claim 3,
A hydraulic analysis sample unit for sampling a calculation result by the hydraulic analysis calculation unit;
A hydraulic analysis sample storage unit for recording a sampling result of the hydraulic analysis sample unit;
A hydraulic analysis approximation unit that approximates the result of the hydraulic analysis calculation from the record of the hydraulic analysis sample unit,
The water distribution plan planning unit calculates an evaluation function value of a water distribution plan based on the approximate value calculated by the hydraulic analysis approximation unit. The water distribution operation control device according to claim 6,
The hydraulic analysis sample unit extracts the control point for preferentially managing the pressure in the water distribution network by simulating the condition for the operation amount calculation unit to calculate the operation amount, and sets the pressure of the control point to a predetermined value. A water distribution operation control apparatus, wherein a hydraulic analysis result under a condition of maintaining the target value is recorded in the hydraulic analysis sample storage unit. The water distribution operation control device according to claim 7,
The hydraulic analysis sample part is a hydraulic analysis calculation under the conditions in which each of the above amounts is changed, with at least one of the distribution flow rate of the distribution station, the water level of the tank, and the flow rate of the flow rate adjustment valve constituting the distribution state. Water distribution operation control device characterized by sampling results. The water distribution operation control device according to claim 8,
The hydraulic analysis approximation unit is an approximate value of hydraulic analysis calculation, and includes at least one of pump power consumption, pump discharge pressure, tank inflow / outflow amount, pressure in the distribution pipe network, and a node as the control point by the operation amount calculation unit. A water distribution operation control device characterized by calculating the above. The water distribution operation control device according to claim 9,
The water distribution operation control device, wherein the hydraulic analysis sample unit samples a hydraulic analysis result under a condition in which an amount constituting the water distribution state is changed at regular intervals. The water distribution operation control device according to claim 10,
The hydraulic analysis approximation unit extracts the result of the hydraulic analysis calculation recorded in the hydraulic analysis sample storage unit from the hydraulic analysis sample storage unit, and extracts the sampling result surrounding a given distribution state from the hydraulic analysis sample storage unit. A water distribution operation control apparatus that calculates an approximate value by performing linear interpolation on the sampling results for the amount constituting each water distribution state.

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