A water supply scheduling method

Abstract

The application provides a water supply scheduling method, which is suitable for water supply scheduling of a reservoir. The reservoir comprises an ecological discharge device and a water supply gate, and the ecological discharge device and the water supply gate are both provided with an automatic control system. According to the predicted water supply flow demand and the ecological flow design value, the current reservoir water level and the predicted hourly inflow, the reservoir obtains the reservoir water level at the end of each time point in a day, and during the scheduling operation, the inflow is corrected according to the hourly operation result, so that the scientific and reasonable scheduling of the inflow and the water supply demand is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic engineering, in particular to a water supply scheduling method. BACKGROUND

[0002] The reservoir can redistribute the natural inflow, and through the construction of the reservoir, the reservoir can realize efficient and reasonable utilization of water resources by using the storage performance of the reservoir. For the functions of the reservoir, it can be divided into flood control function, water supply function, irrigation function, power generation function, etc. Considering the ecological role of the reservoir, the reservoir is generally provided with an ecological flow device to realize ecological flow supply to the downstream river channel and ensure the ecological demand of the downstream river channel.

[0003] For the reservoir with water supply function, a scientific and reasonable scheduling mode is needed to ensure the reasonable utilization of the reservoir and water supply. Generally, according to the scheduling operation requirements, the reservoir and water supply adopt daily scheduling, and reasonable scheduling is carried out according to the daily scheduling plan. At present, the water supply scheduling lacks a reasonable operation mode, which causes waste of water resources and cannot guarantee the scheduling operation needs of the reservoir. SUMMARY

[0004] The present application provides a water supply scheduling method to realize reasonable and scientific scheduling of reservoir water supply.

[0005] The present application provides a water supply scheduling method, which is suitable for water supply scheduling of a reservoir. The reservoir comprises an ecological discharge device and a water supply gate. The ecological discharge device is an ecological gate, the gate opening of the ecological gate is adjustable, and the ecological gate is provided with an automatic control system. The automatic control system can adjust the opening of the ecological gate according to the reservoir water level to ensure that the discharge of the ecological gate is Qs, wherein Qs is the ecological flow design value of the reservoir. The water supply gate is provided with a gate opening monitoring device and an automatic control device. The reservoir is provided with a reservoir water level monitoring device. The water supply gate is connected with a water supply system, and the water supply system allows the water supply flow to fluctuate. The reservoir is provided with a runoff forecasting system for forecasting the hourly inflow of the reservoir. The water supply system is provided with a water supply forecasting system for forecasting the daily water supply demand flow Qx. The water supply scheduling method is suitable for the case that the reservoir has no rainfall, and comprises the following steps:

[0006] S1: obtaining daily water supply demand flow Qx and daily water supply amount Wx according to a water supply prediction system at the beginning of each daily period, obtaining water reservoir hourly inflow Qi and daily inflow amount Wr according to a runoff prediction system, calculating daily ecological water amount Ws of the water reservoir according to the ecological flow design value Qs of the water reservoir, calculating daily storage water amount Wc of the water reservoir according to the daily water supply amount Wx, the daily inflow amount Wr and the daily ecological water amount Ws, obtaining the reservoir water level H1 at the current time, calculating the current reservoir capacity V1 of the water reservoir according to the water level-storage capacity curve, calculating the reservoir water level H2 at the end of each daily period according to the water level-storage capacity curve based on the current reservoir capacity V1 and the daily storage water amount Wc;

[0007] S2: performing daily water supply dispatching from the beginning of each daily period, adjusting the opening degree of the water supply gate by using the automatic control device of the water supply gate according to the daily water supply demand flow Qx and the current reservoir water level, so that the water flow of the water supply gate is equal to the daily water supply demand flow Qx, obtaining the reservoir water level Hi at the current time after one hour of operation;

[0008] S3: calculating the actual inflow Qk of the last hour according to the current reservoir water level Hi and the reservoir water level H1 at the end of the last hour, and combining the water balance of the water reservoir, calculating the deviation coefficient K according to the actual inflow Qk of the last hour and the inflow Qik of the last hour predicted by the runoff prediction system, the deviation coefficient K = Qk / Qik, correcting the inflow from the current time to the end of each daily period predicted by the runoff prediction system, the correction is that the inflow from the current time to the end of each daily period predicted by the runoff prediction system in step S1 is multiplied by the deviation coefficient K, to obtain the predicted inflow Qip from the current time to the end of each daily period;

[0009] S4: performing water balance calculation of the water reservoir according to the reservoir water level Hi obtained in step S3 and the predicted inflow Qip from the current time to the end of each daily period, taking the reservoir water level H2 at the end of each daily period as the control condition, and combining the ecological flow design value Qs, to calculate the hourly average water supply flow Qxi of the water reservoir;

[0010] S5: adjusting the opening degree of the water supply gate by using the automatic control device of the water supply gate according to the hourly average water supply flow Qxi of the water reservoir obtained in step S4 and the current reservoir water level Hi, so that the water flow of the water supply gate is equal to the water supply flow Qxi, performing dispatching for the second hour, and obtaining the reservoir water level Hii at the current time after the second hour ends;

[0011] S6: repeating steps S3-S5 until the hour before the end of the day, and obtaining the average water supply flow rate Qxii, and adjusting the opening degree of the water supply gate at the hour before the end of the day according to the average water supply flow rate Qxii and the current reservoir water level by using the automatic control device of the water supply gate, so that the water flow rate of the water supply gate is equal to the water supply flow rate Qxii.

[0012] Preferably, the time period in S1 is the time when the daily reservoir scheduling plan is made, and the time period is zero or 8 o'clock in the morning.

[0013] Preferably, the water supply gate is provided with an opening degree-water level-flow rate curve, and the flow rate value of the water supply gate can be calculated according to any opening degree and water level, or the opening degree value of the water supply gate can be calculated according to any water level and flow rate value.

[0014] Preferably, the water balance of the reservoir is calculated by calculating the inflow and outflow of the reservoir in a certain time period, wherein the outflow includes water supply and ecological water, calculating the reservoir storage water in a certain time period, and obtaining the reservoir capacity at the end of the time period by adding the reservoir capacity at the beginning of the time period and the reservoir storage water in the time period, wherein the conversion between the reservoir capacity and the water level is realized by using the water level-reservoir capacity curve.

[0015] The working principle of the present application is as follows:

[0016] The present application is suitable for water supply reservoirs, wherein the reservoir adopts daily scheduling mode, that is, scheduling plan is made every day and scheduling is completed according to the plan, and the plan is made every day, the reservoir is provided with ecological flow discharge device, which maintains constant flow discharge, that is, the discharge flow rate of the ecological gate is equal to the ecological flow design value, and the guarantee method is to adjust the opening degree of the ecological gate, so as to guarantee the constant value of the ecological flow, thereby avoiding insufficient or excessive ecological flow discharge and causing unreasonable use of water resources.

[0017] The water supply system is provided with a water supply forecasting system for forecasting daily water supply demand flow rate Qx, wherein the water supply forecasting system can be determined according to user water supply demand and other factors, the water supply system is provided with a regulation and storage device, so that the water supply guarantee rate is not affected when the water supply flow rate of the water supply reservoir fluctuates, and the reservoir is provided with a runoff forecasting system, which can predict the hourly reservoir inflow process, and for the reservoir, the inflow process is relatively stable when there is no rainfall, so that the forecasting is performed once at the beginning of each day according to the water supply forecasting system and the runoff forecasting system, wherein the water supply forecasting system obtains the daily water supply demand flow rate Qx, which is the daily average value, and the runoff forecasting system is the hourly inflow of each day, and for the flow rate value, the daily time period is multiplied to obtain the daily water volume value.

[0018] In the scheduling, the scheduling plan is initially formulated at the time of each day, and in particular, the reservoir water level at the end of each time of the day is formulated according to the daily water supply demand flow Qx, the ecological flow design value, and the predicted runoff value and the reservoir water level value at the beginning of the day, and the scheduling plan is formed, which is reported to the reservoir management department or the superior scheduling department for approval to form the daily scheduling plan, and in the daily scheduling, the approved reservoir water level at the end of each time of the day is taken as the scheduling target for scheduling.

[0019] The hourly rolling scheduling is performed, the water supply gate is adjusted for scheduling according to the water supply flow value initially formulated at each hour, after one hour of scheduling, the actual inflow is calculated according to the change of the reservoir water level, and the deviation coefficient is calculated according to the actual inflow and the predicted inflow of the hour, and the runoff prediction value of the time period of the day is corrected according to the deviation coefficient, wherein the deviation of the actual value and the predicted value of the last hour is used as the correction basis for each correction, and the actual value is obtained by water balance calculation of the reservoir, and the predicted value is obtained by the runoff prediction system which is predicted once a day, that is, the inflow Qik of the last hour obtained by the runoff prediction system in step S1, and the water supply flow is corrected according to the corrected runoff prediction value of the time period of the day combined with the current reservoir water level, the reservoir water level at the end of the day, and the ecological flow design value, wherein the water supply flow is the average value of the water supply flow of the time period of the day, and the scheduling is rolled until the end of the day.

[0020] In the non-rainfall period, the runoff process is relatively stable, therefore, after the end of each hour of scheduling, the actual inflow of the last hour is calculated and compared with the inflow of the prediction system to correct the deviation coefficient, and through the rolling correction, the runoff prediction value can be corrected and adjusted according to the actual value to ensure the accuracy of the runoff prediction, and the present application can ensure the scientific nature of the water supply scheduling through the real-time rolling adjustment according to the daily scheduling plan, so as to realize the scientific and reasonable scheduling of the water supply reservoir.

[0021] The present application has the following advantages:

[0022] The present application provides a water supply scheduling method, which is suitable for the water supply scheduling of a reservoir, the reservoir comprises an ecological discharge device and a water supply gate, the ecological discharge device and the water supply gate are both provided with an automatic control system, the reservoir obtains the reservoir water level at the end of each time of the day according to the predicted water supply flow demand and the ecological flow design value combined with the current reservoir water level and the predicted hourly inflow at the beginning of each day, and the inflow is corrected according to the hourly operation result during the scheduling operation, so as to realize the scientific and reasonable scheduling of the inflow and the water supply demand. DETAILED DESCRIPTION

[0023] The following will be specifically explained and described.

[0024] The application provides a water supply scheduling method, which is suitable for water supply scheduling of a reservoir, the reservoir comprising an ecological discharge device and a water supply gate, the ecological discharge device being an ecological gate, the gate opening degree of the ecological gate being adjustable, and the ecological gate being provided with an automatic control system, which can adjust the gate opening degree of the ecological gate according to the reservoir water level, so as to ensure that the discharge flow of the ecological gate is Qs, wherein Qs is the ecological flow design value of the reservoir; the water supply gate is provided with a gate opening degree monitoring device and an automatic control device, the reservoir is provided with a reservoir water level monitoring device, the water supply gate is connected with a water supply system, the water supply system allows fluctuation of the water supply flow, the reservoir is provided with a runoff forecasting system for forecasting the hourly inflow of the reservoir, and the water supply system is provided with a water supply forecasting system for forecasting the daily water supply demand flow Qx, and the water supply scheduling method is characterized in that: the water supply scheduling method is suitable for the case that the reservoir has no rainfall, and comprises the following steps:

[0025] S1: obtaining the daily water supply demand flow Qx and the daily water supply volume Wx according to the water supply forecasting system at the beginning of each daily period, obtaining the hourly inflow Qi and the daily inflow Wr of the reservoir according to the runoff forecasting system, calculating the daily ecological water volume Ws of the reservoir according to the ecological flow design value Qs of the reservoir, calculating the daily storage water volume Wc of the reservoir according to the daily water supply volume Wx, the daily inflow Wr and the daily ecological water volume Ws, obtaining the reservoir water level H1 at the current time, calculating the reservoir capacity V1 at the current time according to the water level-storage capacity curve, calculating the reservoir capacity V2 at the end of each daily period according to the current capacity V1 combined with the daily storage water volume Wc, and then calculating the reservoir water level H2 at the end of each daily period according to the water level-storage capacity curve;

[0026] S2: performing daily water supply scheduling from the beginning of each daily period, adjusting the opening degree of the water supply gate by using the automatic control device of the water supply gate according to the daily water supply demand flow Qx combined with the current reservoir water level, so that the water flow of the water supply gate is equal to the daily water supply demand flow Qx, obtaining the reservoir water level Hi at the current time after running for 1 hour;

[0027] S3: calculating the actual inflow Qk of the last hour according to the current reservoir water level Hi and the reservoir water level H1 at the last hour combined with the water balance of the reservoir, calculating the deviation coefficient K according to the actual inflow Qk of the last hour and the inflow Qik of the last hour obtained by the runoff forecasting system, the deviation coefficient K=Qk / Qik, correcting the inflow from the current time to the end of each daily period obtained by the runoff forecasting system, the correction being that the inflow from the current time to the end of each daily period obtained by the runoff forecasting system in step S1 is multiplied by the deviation coefficient K to obtain the predicted inflow Qip from the current time to the end of each daily period;

[0028] S4: According to the reservoir water level H1 obtained in step S3 and the predicted inflow Qip from the current time to the end of the day, the water balance calculation of the reservoir is performed with the reservoir water level H2 at the end of the day as the control condition, combined with the ecological flow design value Qs, to calculate the hourly average water supply flow Qxi of the reservoir;

[0029] S5: According to the hourly average water supply flow Qxi obtained in step S4, the opening of the water supply gate is adjusted by using the automatic control device of the water supply gate, so that the water flow of the water supply gate is equal to the water supply flow Qxi, the second hour is dispatched, and the reservoir water level Hii at the current time is obtained after the second hour ends.

[0030] S6: Steps S3-S5 are repeated until the average water supply flow Qxii of the previous hour before the end of the day is obtained, and the opening of the water supply gate is adjusted according to the average water supply flow Qxii and the current reservoir water level by using the automatic control device of the water supply gate, so that the water flow of the water supply gate is equal to the water supply flow Qxii.

[0031] For the ecological gate, the opening-flow-water level relationship curve of the ecological gate can be determined by test or hydraulics, and according to the curve, the opening value of the ecological gate at different water levels can be adjusted, so that the ecological flow discharge is always equal to the ecological flow design value.

[0032] The water supply gate can determine the opening-flow-water level relationship curve of the water supply gate by test or hydraulics, and the automatic control system of the water supply gate can automatically call the opening-flow-water level relationship curve of the water supply gate according to the required flow value and the current reservoir water level, and determine the opening value of the water supply gate.

[0033] As a preferred, the time period initial in S1 is the time when the daily reservoir scheduling plan is made, and the time period initial is zero or eight o'clock in the morning.

[0034] As a preferred, the water supply gate is provided with an opening-water level-flow curve, and according to any opening and water level, the flow value of the water supply gate can be calculated, or according to any water level and flow value, the opening value of the water supply gate can be calculated.

[0035] As a preferred, the water balance calculation of the reservoir is to calculate the inflow and outflow of the reservoir in a certain period, wherein the outflow includes water supply and ecological water, to calculate the reservoir storage water in a certain period, to obtain the storage capacity at the end of the period by adding the reservoir storage water in the period to the storage capacity at the beginning of the period, and to convert the storage capacity and water level by using the water level-storage capacity curve.

[0036] The acquisition of the reservoir water level should be filtered, and the reservoir water levels of multiple adjacent time periods are averaged to eliminate accidental measurement errors at the time of reservoir water level acquisition. The filtering process can be realized by computer software.

[0037] The above embodiments are only preferred embodiments of the present application, and the protection scope of the present application should not be regarded as limited to the specific forms described in the examples. The protection scope of the present application also includes equivalent technical means that can be thought of by those skilled in the art according to the concept of the present application.

Claims

1. A water supply scheduling method, which is suitable for water supply scheduling of a reservoir, the reservoir comprising an ecological discharge device and a water supply gate, the ecological discharge device being an ecological gate, the gate opening of the ecological gate being adjustable, the ecological gate being provided with an automatic control system, the automatic control system being capable of adjusting the gate opening of the ecological gate according to the reservoir water level, so as to ensure that the discharge flow of the ecological gate is Qs, wherein Qs is the ecological flow design value of the reservoir; the water supply gate being provided with a gate opening monitoring device and an automatic control device, the reservoir being provided with a reservoir water level monitoring device, the water supply gate being connected with a water supply system, the water supply system allowing fluctuation of the water supply flow, the reservoir being provided with a runoff forecasting system for forecasting the hourly inflow of the reservoir, the water supply system being provided with a water supply forecasting system for forecasting the daily water supply demand flow Qx, and the method being characterized in that: The water supply scheduling method is suitable for the case that the reservoir has no rainfall, and comprises the following steps: ​ S1: obtaining daily water supply demand flow Qx and daily water supply amount Wx by a water supply prediction system, obtaining hourly inflow Qi and daily inflow amount Wr of the reservoir by a runoff prediction system, calculating daily ecological water amount Ws of the reservoir according to the ecological flow design value Qs of the reservoir, calculating daily storage water amount Wc of the reservoir according to the daily water supply amount Wx, the daily inflow amount Wr and the daily ecological water amount Ws, obtaining the reservoir water level H1 at the current time, calculating the reservoir capacity V1 at the current time according to the water level-capacity curve, calculating the reservoir water level H2 at the end of each day according to the reservoir capacity V2 at the end of each day combined with the daily storage water amount Wc, and then calculating the reservoir water level H2 at the end of each day according to the water level-capacity curve; S2: performing daily water supply scheduling from the beginning of each day, adjusting the opening degree of the water supply gate by using the automatic control device of the water supply gate according to the daily water supply demand flow Qx combined with the current reservoir water level, so that the water flow of the water supply gate is equal to the daily water supply demand flow Qx, obtaining the reservoir water level Hi at the current time after one hour of operation; S3: calculating the actual inflow Qk of the last hour according to the current reservoir water level Hi and the reservoir water level H1 at the last hour combined with the water balance of the reservoir, calculating the deviation coefficient K according to the actual inflow Qk of the last hour and the inflow Qik of the last hour predicted by the runoff prediction system, the deviation coefficient K=Qk / Qik, correcting the inflow from the current time to the end of each day predicted by the runoff prediction system, the correction is that the inflow from the current time to the end of each day predicted by the runoff prediction system in step S1 is multiplied by the deviation coefficient K to obtain the predicted inflow Qip from the current time to the end of each day; S4: performing water balance calculation of the reservoir according to the reservoir water level Hi obtained in step S3 and the predicted inflow Qip from the current time to the end of each day, taking the reservoir water level H2 at the end of each day as the control condition, and combining the ecological flow design value Qs, to calculate the hourly average water supply flow Qxi of the reservoir; the water balance calculation of the reservoir is to calculate the inflow amount and the outflow amount of the reservoir in a certain period, wherein the outflow amount includes the water supply amount and the ecological water amount, to calculate the reservoir storage water amount in the period, and to obtain the reservoir capacity at the end of the period by using the reservoir capacity at the beginning of the period plus the reservoir storage water amount in the period, wherein the conversion between the reservoir capacity and the water level utilizes the water level-capacity curve; S5: adjusting the opening degree of the water supply gate by using the automatic control device of the water supply gate according to the hourly average water supply flow Qxi of the reservoir obtained in step S4 combined with the current reservoir water level Hi, so that the water flow of the water supply gate is equal to the water supply flow Qxi, performing the scheduling of the second hour, and obtaining the reservoir water level Hii at the current time after the second hour. S6: repeating steps S3-S5 until one hour before the end of the day, and obtaining the average water supply flow rate Qxii, adjusting the opening of the water supply gate according to the average water supply flow rate Qxii and the current reservoir water level at one hour before the end of the day using the automatic control device of the water supply gate, so that the water flow rate of the water supply gate is equal to the water supply flow rate Qxii.

2. The water supply scheduling method of claim 1, wherein: The time period in S1 is the time of the daily reservoir scheduling plan, and the time period is zero or eight o'clock in the morning.

3. The water supply scheduling method of claim 1, wherein: The water supply gate is provided with an opening-water level-flow rate curve, and according to any opening and water level, the flow rate value of the water supply gate can be calculated, or according to any water level and flow rate value, the opening value of the water supply gate can be calculated.