A joint dispatching method for diversion of main stream into branch based on water storage index

Abstract

The application discloses a kind of based on water storage index's joint scheduling method of diversion into branch engineering, belong to water supply scheduling technical field, can solve the problem of low efficiency of engineering operation caused by the incoordination of existing technology supply-storage mode.The method comprises the following steps: S1, according to the hydrological information of the main stream and the water demand information of the water user, the dispatching period is divided into the first dispatching period of which the water storage is greater than the water supplement and the second dispatching period of which the water storage is less than the water supplement;S2, determine the multiple correlation factors of water storage index, determine the water storage index of the first dispatching period and the second dispatching period according to the multiple correlation factors;S3, construct the joint scheduling model of water supply reservoir and storage reservoir according to the water storage index of the first dispatching period and the second dispatching period;S4, determine the joint scheduling scheme of water supply reservoir and storage reservoir by using the joint scheduling model.The application is used for the joint scheduling of diversion into branch engineering.

Description

TECHNICAL FIELD

[0001] The application relates to a joint scheduling method based on a water storage index for a diversion project from a trunk stream to a branch stream, and belongs to the technical field of water supply scheduling. BACKGROUND

[0002] At present, the diversion project from a trunk stream to a branch stream usually uses a water supply reservoir constructed on the trunk stream to supply water to a water user, and at the same time, when the water user is in a water use low valley period or the water supply capacity of the trunk stream is sufficient, relatively abundant water resources in the trunk stream are diverted to the branch stream through diversion facilities (diversion gates, diversion dams, etc.), and the water resources are stored in a storage reservoir constructed on the branch stream; and when the water user is in a water use peak period or the water supply capacity of the trunk stream is insufficient, the storage reservoir of the branch stream supplies water to the trunk stream to meet the water demand of the water user.

[0003] However, in actual operation, the diversion project from a trunk stream to a branch stream often cannot guarantee the water demand of the water user in time, and the contradiction between water supply and demand in the basin is difficult to effectively alleviate, and the operation efficiency of the project is low. The reason is that the supply-storage mode of the diversion project from a trunk stream to a branch stream is not coordinated, specifically, the water storage time is not properly selected and the storage water quantity is not properly controlled. In terms of water storage time selection, when the trunk stream water supply reservoir is about to face continuous water supply, excessive advance storage of a large amount of water resources in the trunk stream in the branch stream storage reservoir will directly reduce the available water quantity of the trunk stream water supply reservoir, causing continuous water shortage, and the water demand that can be met is not met. In terms of storage water quantity control, if the storage water quantity of the branch stream is too much, the available water quantity of the trunk stream water supply reservoir will be reduced, affecting the water supply capacity of the trunk stream water supply reservoir, and vice versa, if the storage water quantity of the branch stream is too small, although it can guarantee the sufficient current available water quantity of the trunk stream water supply reservoir, but when the subsequent period encounters continuous water shortage, the small storage water quantity of the branch stream storage reservoir cannot effectively supplement the future available water quantity of the trunk stream water supply reservoir, resulting in that the water shortage cannot be improved, and the water supply capacity of the trunk stream water supply reservoir is affected.

[0004] In addition, in the actual operation of the project, the future available water quantity of the trunk stream water supply reservoir needs to be estimated in advance in combination with the water demand of the water user, and the possible future water supply shortage situation is predicted, so as to start the branch stream storage reservoir to supplement the trunk stream water supply reservoir in time. At this time, reasonable control of the supplement water quantity of the branch stream storage reservoir is extremely important to guarantee the overall water supply effect of the diversion project from a trunk stream to a branch stream. If the supplement water quantity of the branch stream storage reservoir is too small, it cannot effectively make up the water supply quantity gap of the trunk stream water supply reservoir; if the supplement water quantity of the branch stream storage reservoir is too much, although it can make up the water supply quantity gap of the trunk stream water supply reservoir, but the supplement water quantity exceeding the water supply quantity gap is difficult to be consumed and causes water waste, resulting in waste of water resources and project efficiency. SUMMARY

[0005] The application provides a joint scheduling method for a diversion project based on a water storage index, which can solve the problem of low operation efficiency caused by the incoordination of the supply-storage mode in the prior art.

[0006] The application provides a joint scheduling method for a diversion project based on a water storage index, the diversion project comprising a water supply reservoir located in a main stream and a storage reservoir located in a branch stream, the water supply reservoir being used for supplying water to a water user by using water in the main stream, and the storage reservoir being used for storing water in the main stream and supplementing water to the water supply reservoir; the method comprises:

[0007] S1, dividing a scheduling period into a first scheduling period in which the water storage amount is greater than the water supplement amount and a second scheduling period in which the water storage amount is less than the water supplement amount according to hydrological information of the main stream and water demand information of the water user;

[0008] S2, determining a plurality of correlation factors of a water storage index, the water storage index being a proportion of water stored in the storage reservoir in the total water amount of the main stream in the same scheduling period; and determining the water storage indexes of the first scheduling period and the second scheduling period according to the plurality of correlation factors;

[0009] S3, constructing a joint scheduling model of the water supply reservoir and the storage reservoir according to the water storage indexes of the first scheduling period and the second scheduling period;

[0010] S4, determining a joint scheduling scheme of the water supply reservoir and the storage reservoir by using the joint scheduling model.

[0011] Optionally, the hydrological information comprises runoff amounts of a plurality of periods in the scheduling period; the water demand information comprises water demand amounts of a plurality of periods in the scheduling period; and S1 specifically comprises:

[0012] determining a period in which the runoff amount of the main stream is greater than a first preset runoff amount and the water demand amount of the water user is less than a first preset water demand amount as the first scheduling period;

[0013] determining a period in which the runoff amount of the main stream is less than a second preset runoff amount and the water demand amount of the water user is greater than a second preset water demand amount as the second scheduling period.

[0014] Optionally, S2 specifically comprises:

[0015] determining a correlation degree of each correlation factor in the plurality of correlation factors and the water storage index by using a grey correlation degree method, to obtain a plurality of correlation degrees;

[0016] determining the water storage indexes of the first scheduling period and the second scheduling period according to all the correlation factors and all the correlation degrees.

[0017] Optionally, the water storage indexes of the first scheduling period and the second scheduling period are determined according to all the correlation factors and all the correlation degrees, and specifically include:

[0018] The weight coefficients of each correlation factor are determined;

[0019] The water storage index of the first scheduling period is determined according to the weight coefficient of each correlation factor and the time sequence series of each correlation factor in the first scheduling period;

[0020] The water storage index of the second scheduling period is determined according to the weight coefficient of each correlation factor and the time sequence series of each correlation factor in the second scheduling period.

[0021] Optionally, S3 specifically includes:

[0022] S31, constructing a water storage sub-model of the storage reservoir according to the water storage indexes of the first scheduling period and the second scheduling period, and the design parameters of the storage reservoir;

[0023] S32, constructing a joint water supply sub-model of the water supply reservoir and the storage reservoir according to the design parameters of the water supply reservoir and the design parameters of the storage reservoir, wherein the water storage sub-model and the joint water supply sub-model constitute the joint scheduling model.

[0024] Optionally, S31 specifically includes:

[0025] A first objective function and a second objective function are respectively determined according to the water storage indexes of the first scheduling period and the second scheduling period, wherein the first objective function / second objective function is used for minimizing and optimizing the water storage flow of the storage reservoir in the first scheduling period / second scheduling period;

[0026] A first constraint condition is determined according to the design parameters of the storage reservoir, wherein the first constraint condition is used for constraining a first operating parameter of the storage reservoir;

[0027] The water storage sub-model is constructed based on the first objective function, the second objective function and the first constraint condition.

[0028] Optionally, a first objective function and a second objective function are respectively determined according to the water storage indexes of the first scheduling period and the second scheduling period, and specifically include:

[0029] The first objective function is constructed according to the water storage index of the first scheduling period and the dry flow in the first scheduling period;

[0030] The second objective function is constructed according to the water storage index of the second scheduling period and the dry flow in the second scheduling period.

[0031] Optionally, S32 specifically comprises:

[0032] determining a third objective function, the third objective function being used for maximizing the water supply flow of the water supply reservoir in the scheduling period;

[0033] determining a second constraint condition according to the design parameter of the water supply reservoir and the design parameter of the storage reservoir, the second constraint condition being used for constraining the operation parameter of the water supply reservoir and the second operation parameter of the storage reservoir;

[0034] constructing the joint water supply sub-model based on the third objective function and the second constraint condition.

[0035] Optionally, S4 specifically comprises:

[0036] S41, based on the historical hydrological data of the main stream and the branch stream, performing first simulation operation on the water supply reservoir and the storage reservoir by using the joint scheduling model and determining whether the result of the first simulation operation meets the preset requirement, if not, performing step S42; if yes, performing step S43;

[0037] S42, adjusting the division mode of the first scheduling period and the second scheduling period, and / or adjusting a plurality of correlation factors, and repeating steps S1 to S41;

[0038] S43, based on the current hydrological data, performing second simulation operation on the water supply reservoir and the storage reservoir by using the joint scheduling model, and determining the joint scheduling scheme of the water supply reservoir and the storage reservoir according to the result of the second simulation operation.

[0039] Optionally, the plurality of correlation factors include at least two of the following: the division mode of the first scheduling period and the second scheduling period, the hydraulic connection between the water supply reservoir and the storage reservoir, the spatial relationship between the water supply reservoir and the storage reservoir, the regulation and storage capacity of the main-branch diversion project, the water supply target of the main-branch diversion project, and the task index of the main-branch diversion project.

[0040] The beneficial effects that can be produced by the present application include:

[0041] The present application divides the scheduling period into a first scheduling period and a second scheduling period according to the hydrological information of the dry flow and the water demand information of the water object, so as to clearly distinguish the main operation state of the storage reservoir in time (mainly storing water in the first scheduling period and mainly supplementing water in the second scheduling period); then the storage indexes of the two scheduling periods are determined according to a plurality of correlation factors, and a joint scheduling model is constructed based on the two storage indexes, so as to ensure that the joint scheduling model can jointly optimize the operation process of the two reservoirs based on the operation state of the different scheduling periods, and finally the joint scheduling scheme is obtained by simulating the operation of the joint scheduling model and iterative optimization. In this way, the joint scheduling process of the diversion and dry-in-branch project is closely related to the hydrological regime, the water demand of the water object, and the topological relationship of the two reservoirs and other factors, so as to ensure the coordinated matching of the supply-storage process, timely meet the water demand, and effectively improve the water resource utilization rate and the engineering operation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 A flowchart of the joint scheduling method of the diversion and dry-in-branch project based on the storage index provided by the embodiment of the present application is shown in

[0043] Figure 2 A topological structure diagram of the diversion and dry-in-branch project provided by the embodiment of the present application is shown in

[0044] Figure 3 A scheduling operation diagram of the water supply reservoir provided by the embodiment of the present application is shown in

[0045] Figure 4 A scheduling operation diagram of the storage reservoir provided by the embodiment of the present application is shown in DETAILED DESCRIPTION

[0046] The present application will be described in detail below in conjunction with the embodiments, but the present application is not limited to these embodiments.

[0047] The embodiment of the present application provides a joint scheduling method of a diversion and dry-in-branch project based on a storage index, as shown in Figure 2 The diversion and dry-in-branch project includes a water supply reservoir located in a dry flow and a storage reservoir located in a branch, the water supply reservoir is used to supply water to a water object by using the water quantity of the dry flow, and the storage reservoir is used to store the dry flow and supplement water to the water supply reservoir. As shown in Figure 1 The method comprises:

[0048] S1, according to the hydrological information of the dry flow and the water demand information of the water object, the scheduling period is divided into a first scheduling period in which the storage quantity is greater than the supplement quantity and a second scheduling period in which the storage quantity is less than the supplement quantity.

[0049] The hydrological information of the main stream includes runoff, rainfall, water level and the like of the main stream in multiple time periods in the scheduling period, and only the runoff is taken as an example for description in this embodiment; the water demand information of the water user includes water demand of the water user in multiple time periods in the scheduling period.

[0050] S1 specifically includes:

[0051] The time period in which the runoff of the main stream is greater than the first preset runoff and the water demand of the water user is less than the first preset water demand is determined as the first scheduling time period;

[0052] The time period in which the runoff of the main stream is less than the second preset runoff and the water demand of the water user is greater than the second preset water demand is determined as the second scheduling time period.

[0053] In this embodiment, the first preset runoff, the second preset runoff, the first preset water demand and the second preset water demand can be flexibly set according to scheduling requirements, as long as the storage amount of the storage reservoir in the first scheduling time period is greater than the replenishment amount and the storage amount in the second scheduling time period is less than the replenishment amount, so as to ensure that the operation state of the storage reservoir in the first scheduling time period is mainly water storage and the operation state in the second scheduling time period is mainly water replenishment.

[0054] For example, the first preset runoff and the second preset runoff can be determined according to the runoff of the main stream in the wet season and the dry season respectively, and the first preset water demand and the second preset water demand can be determined according to the water demand of the water user in the low water consumption period and the peak water consumption period respectively.

[0055] It is worth noting that although the operation state of the storage reservoir in the first scheduling time period is mainly water storage, due to the dynamic changes of the runoff of the main stream and the water demand of the water user, the storage reservoir may still have a water replenishment process in the first scheduling time period, only the replenishment amount in the first scheduling time period is less than the storage amount; similarly, although the operation state of the storage reservoir in the second scheduling time period is mainly water replenishment, due to the dynamic changes of the runoff of the main stream and the water demand of the water user, the storage reservoir may still have a water storage process in the second scheduling time period, only the storage amount in the second scheduling time period is less than the replenishment amount.

[0056] This embodiment can clearly distinguish the main operation state of the storage reservoir in time by dividing the scheduling period into the first scheduling time period and the second scheduling time period, so as to facilitate accurate regulation and control of the operation process of the water supply reservoir and the storage reservoir in subsequent steps according to different operation states of the storage reservoir, so as to improve the overall efficiency of the main-branch diversion project.

[0057] S2, determine a plurality of correlation factors of a water storage index, the water storage index being a proportion of water stored in the storage reservoir in total water of the main stream in the same scheduling period; determine the water storage index of the first scheduling period and the second scheduling period according to the plurality of correlation factors.

[0058] Specifically, the plurality of correlation factors include at least two of the following factors: a division mode of the first scheduling period and the second scheduling period, a hydraulic connection between the water supply reservoir and the storage reservoir, a spatial relationship between the water supply reservoir and the storage reservoir, a regulation and storage capacity of the main-branch diversion project, a water supply target of the main-branch diversion project, and a task index of the main-branch diversion project.

[0059] The division mode of the first scheduling period and the second scheduling period is determined by specific settings of the first preset runoff, the second preset runoff, the first preset water demand, and the second preset water demand; the hydraulic connection and the spatial relationship between the water supply reservoir and the storage reservoir are determined by a topological structure as shown in FIG. 1; the regulation and storage capacity of the main-branch diversion project is determined by design parameters of the water supply reservoir and the storage reservoir; the water supply target of the main-branch diversion project is determined by water demand of the water user; and the task index of the main-branch diversion project includes a water supply guarantee rate and a water supply safety degree, which can be flexibly set according to actual conditions. Figure 2

[0060] It is worth noting that the correlation factors in the embodiment can not be limited to the above-mentioned correlation factors, and other factors that have a correlation relationship with the water storage index can also be added to the correlation factors. In practice, a plurality of correlation factors can be flexibly selected according to past experience and actual engineering conditions.

[0061] In S2, the water storage index of the first scheduling period and the second scheduling period is determined according to the plurality of correlation factors, and specifically includes:

[0062] 1) Determine the correlation degree of each correlation factor in the plurality of correlation factors and the water storage index by using the grey correlation degree method, to obtain a plurality of correlation degrees. The specific process is as follows:

[0063] First, obtain the original time sequence series of each correlation factor in the scheduling period, and then normalize the original time sequence series of each correlation factor to obtain the normalized time sequence series of each correlation factor, so as to eliminate the dimensional differences between different correlation factors and make the plurality of correlation factors comparable. The formula for normalization processing is:

[0064] (1)

[0065] In formula (1), denotes the data at time t in the normalized time sequence series of the i th correlation factor; denotes the data at time t in the normalized time sequence series of the j th correlation factor; denotes the data at time t in the normalized time sequence series of the k th correlation factor. ​​the total number of time points in the original time series of the correlation factor data at the time point; representing the original time series of the correlation factor the total number of time points in the original time series of the correlation factor.

[0066] Then, taking the time series of the water storage index as the reference series and the normalized time series of each correlation factor as the comparison series, the grey correlation degree method is used to calculate the correlation coefficient of the two, and the calculation formula is:

[0067] (2)

[0068] In formula (2), representing the normalized time series of the correlation factor the correlation coefficient of the comparison series and the reference series at the time point, reflecting the correlation degree of the two at the time point; the absolute difference between the comparison series and the reference series at the time point; the maximum value of the absolute difference between the comparison series and the reference series at all time points; the minimum value of the absolute difference between the comparison series and the reference series at all time points; the resolution coefficient for adjusting the sensitivity of the correlation coefficient, which generally takes a value in the range of [0, 1]. It is worth noting that before calculating the correlation coefficient for the first time, an initial time series of the water storage index needs to be set in advance to start the calculation of the correlation coefficient. Since the time series of the water storage index will be optimized through iterative calculation in the subsequent steps, the initial set time series will not affect the accuracy of the results of the method. Finally, the correlation coefficients of each correlation factor at all time points are weighted and averaged to obtain the correlation degree of each correlation factor with the water storage index, and the calculation formula is:

[0069]

[0070] (3)

[0071] (3)

[0072] In formula (3), representing the correlation degree of the correlation factor reflecting the influence degree of the correlation factor on the water storage index; the correlation coefficient of the comparison series and the reference series at the time point; the correlation coefficient of the comparison series and the reference series at the time point; the correlation coefficient of the comparison series and the reference series at the time point; ​​denotes the total number of time points.

[0073] 2) Determine the water storage index of the first scheduling period and the second scheduling period according to all correlation factors and all correlation degrees. The specific process is as follows:

[0074] First, the weight normalization processing method is used to convert the correlation degree of each correlation factor and the water storage index into the weight coefficient of the corresponding correlation factor, so that the sum of the weight coefficients of all correlation factors is equal to 1. For example, if three correlation factors are selected, the correlation degrees of the three correlation factors and the water storage index are 0.8, 0.6 and 0.2 respectively. Obviously, the sum of all correlation degrees is greater than 1. In order to make the sum of the weight coefficients of the three correlation factors equal to 1, the weight normalization processing method can be used to convert the correlation coefficients. For example, the correlation degree of the first correlation factor is 0.8, and the corresponding weight coefficient is 0.8 / (0.8+0.6+0.2) x 1=0.5. Similarly, the weight coefficients of the second and third correlation factors are 0.375 and 0.125 respectively.

[0075] Then, according to the weight coefficient of each correlation factor and the time sequence series of each correlation factor in the first scheduling period, the water storage index of the first scheduling period is determined, and the calculation formula is as follows:

[0076] (4)

[0077] In formula (4), denotes the first scheduling period; denotes the water storage index of the first scheduling period ; denotes the data of the normalized time sequence series of the i-th correlation factor at the time point in the first scheduling period ; denotes the weight coefficient of the i-th correlation factor; denotes the total number of time points in the first scheduling period ; denotes the total number of selected correlation factors. Similarly, according to the weight coefficient of each correlation factor and the time sequence series of each correlation factor in the second scheduling period, the water storage index of the second scheduling period is determined, and the calculation formula is as follows:

[0078] (5)

[0079] (5)

[0080] In formula (5), denotes the second scheduling period; denotes the water storage index of the second scheduling period ; ​​a normalized time series of the correlation factor of the first correlation factor at the time point in the second scheduling period data at the time point in the second scheduling period a weight coefficient of the first correlation factor a total number of time points in the second scheduling period a total number of selected correlation factors

[0081] S3, constructing a joint scheduling model of the water supply reservoir and the storage reservoir according to the storage indexes of the first scheduling period and the second scheduling period, the joint scheduling model being composed of a storage sub-model and a joint water supply sub-model, and the construction method specifically comprising:

[0082] S31, constructing the storage sub-model of the storage reservoir according to the storage indexes of the first scheduling period and the second scheduling period, and the design parameters of the storage reservoir.

[0083] The storage sub-model of the embodiment comprises a first objective function and a second objective function for minimizing and optimizing the storage flow of the storage reservoir in the first scheduling period / second scheduling period, and a first constraint condition for constraining the first operation parameter of the storage reservoir.

[0084] In the embodiment, the construction process of the storage sub-model is specifically as follows:

[0085] 1) respectively according to the storage indexes of the first scheduling period and the second scheduling period, determining the first objective function and the second objective function.

[0086] The embodiment constructs the first objective function according to the storage index of the first scheduling period and the dry stream flow in the first scheduling period, and the first objective function is used for minimizing and optimizing the storage flow of the storage reservoir in the first scheduling period, and can be expressed as:

[0087] (6)

[0088] In formula (6), denotes the storage flow of the storage reservoir at the time point in the first scheduling period denotes minimizing and optimizing denotes the dry stream flow through the tributary water intake at the time point in the first scheduling period denotes the storage index of the first scheduling period

[0089] ​​​​​​​​​​Similarly, in this embodiment, a second objective function is constructed based on the water storage index during the second scheduling period and the main stream flow during the second scheduling period. The second objective function is used to minimize the water storage flow of the reservoir during the second scheduling period, and can be expressed as:

[0090] (7)

[0091] In formula (7), This indicates that the reservoir is in the second scheduling period. middle The water flow rate at any given time; Indicates to Perform a minimization optimization; Indicates the second scheduling period In At any given moment, the flow rate of the main stream passing through the tributary's intake; Indicates the second scheduling period The water storage index.

[0092] Using the first and second objective functions described above, the first scheduling period can be determined. Second scheduling period The water flow rate at each moment is minimized to ensure that the water storage volume of the reservoir is minimized throughout the entire scheduling period.

[0093] It is worth noting that in subsequent steps, this method will establish a third objective function and related constraints to maximize the water supply flow, and jointly optimize the three objective functions. Therefore, the minimum water storage capacity of the reservoir obtained by optimizing the first and second objective functions will necessarily meet the water demand of the users. This allows the water supply target to be achieved with the minimum water storage capacity, and the minimum water storage capacity corresponds to the lowest construction and operating costs of the reservoir, thereby effectively improving the overall efficiency of the water diversion project.

[0094] 2) Determine the first constraint condition based on the design parameters of the reservoir. The first constraint condition is used to constrain the first operating parameters of the reservoir, including the actual filling flow, total water storage, and operating water level of the reservoir.

[0095] In this embodiment, the first constraint specifically includes:

[0096] (8)

[0097] In formula (8), This refers to the entire scheduling period, including the first scheduling session. Second scheduling period ; represents the actual storage flow of the storage reservoir at the moment in the dispatching period; represents the storage flow of the storage reservoir at the moment in the dispatching period; represents the design maximum water diversion flow of the branch water diversion pipeline; represents the actual storage flow of the storage reservoir at the moment in the dispatching period;

[0098] (9)

[0099] In formula (9), represents the total storage amount of the storage reservoir at the moment in the dispatching period; represents the actual storage flow of the storage reservoir at the moment in the dispatching period; represents the actual storage flow of the storage reservoir at the moment in the dispatching period; represents the loss flow of the storage reservoir at the moment in the dispatching period, including evaporation flow, leakage flow, etc.; represents the recharge flow of the storage reservoir to the water supply reservoir at the moment in the dispatching period.

[0100] (10)

[0101] In formula (10), represents the operating water level of the storage reservoir at the moment in the dispatching period; represents the design minimum water level of the storage reservoir; represents the design maximum water level of the storage reservoir.

[0102] S32, constructing a joint water supply sub-model of the water supply reservoir and the storage reservoir according to the design parameters of the water supply reservoir and the design parameters of the storage reservoir.

[0103] The joint water supply sub-model of the embodiment includes a third objective function for maximizing optimization of the water supply flow of the water supply reservoir in the dispatching period, and a second constraint condition for constraining the operating parameter of the water supply reservoir and the second operating parameter of the storage reservoir.

[0104] ​​​​​​​​​​​​​​​​​​​In this embodiment, the construction process of the joint water supply sub-model is as follows:

[0105] 1) Determine the third objective function, which is used to maximize the water supply flow of the water supply reservoir during the scheduling period. This third objective function can be expressed as:

[0106] (11)

[0107] In formula (11), This indicates that the water supply reservoir is in the scheduling period. middle The water supply flow rate at any given time; Indicates to Maximize the optimization; Indicates that the reservoir is in the scheduling period middle The water supply to the reservoir is replenished continuously. This indicates that the water supply reservoir is in the scheduling period. middle The direct water supply flow to water users at all times includes only the flow that is supplied directly to water users by the main stream without being stored in a reservoir, and does not include the flow that is supplied to the water supply reservoir by a reservoir.

[0108] Using the third objective function mentioned above, the scheduling period can be... The water supply flow rate at each moment is maximized to ensure that the water supply reservoir has the maximum water supply throughout the entire scheduling period.

[0109] 2) Determine the second constraint condition based on the design parameters of the water supply reservoir and the storage reservoir. The second constraint condition is used to constrain the operating parameters of the water supply reservoir and the second operating parameters of the storage reservoir. Among them, the operating parameters of the water supply reservoir include the actual water supply flow, available water volume, and operating water level, etc., and the second operating parameters of the storage reservoir include the actual outflow, etc.

[0110] In this embodiment, the second constraint specifically includes:

[0111] (12)

[0112] In formula (12), This indicates that the water supply reservoir is in the scheduling period. middle The actual water supply flow rate at any given time; Indicates that the reservoir is in the scheduling period middle The water supply to the reservoir is replenished continuously. This indicates that the water supply reservoir is in the scheduling period. middle the direct water supply flow of the water supply object at the time t; the total water demand flow of all water supply objects at the time t in the scheduling period . .

[0113] (13)

[0114] In formula (13), the actual outflow of the storage reservoir at the time t in the scheduling period . . the replenishment flow of the water supply reservoir supplied by the storage reservoir at the time t in the scheduling period . . the designed maximum water delivery flow of the storage reservoir to the water supply reservoir.

[0115] (14)

[0116] In formula (14), the available water supply of the water supply reservoir at the time t in the scheduling period . . the available water supply of the water supply reservoir at the time t in the scheduling period . . the available water supply of the water supply reservoir at the time t in the scheduling period . . the actual outflow of the storage reservoir at the time t in the scheduling period . . the loss flow of the water supply reservoir at the time t in the scheduling period, including evaporation flow, leakage flow, etc. . . the direct water supply flow of the water supply object at the time t in the scheduling period .

[0117] (15)

[0118] In formula (15), the operating water level of the water supply reservoir at the time t in the scheduling period . . the designed minimum water level of the water supply reservoir; the designed maximum water level of the water supply reservoir.

[0119] S4, determining a joint scheduling scheme of the water supply reservoir and the storage reservoir by using the joint scheduling model, specifically comprising:

[0120] S41, based on the historical hydrological data of the main stream and the branch stream, performing first simulation operation on the water supply reservoir and the storage reservoir by using the joint operation model and determining whether the effect of the first simulation operation meets the preset requirement.

[0121] Specifically, the historical hydrological data is specifically long series of diversion runoff data, including natural runoff process of the main stream, diversion process of the diversion section design, reservoir inflow and outflow process of the water supply reservoir and the storage reservoir, etc. At the same time, the embodiment also formulates long series of water demand data corresponding to the long series of diversion runoff data, including domestic water use process, industrial water use process, agricultural irrigation water use process, etc.

[0122] In the first simulation operation, the embodiment first parameterizes the storage sub-model and the joint water supply sub-model, and takes the operation water level of the water supply reservoir and the storage reservoir as the decision variable; then discretizes the long series of diversion runoff data and the long series of water demand data, and according to the discrete calculation step, synchronously iteratively optimizes the three objective functions in the storage sub-model and the joint water supply sub-model, realizes joint solution of the storage sub-model and the joint water supply sub-model, and thus obtains the long series of operation process of the diversion project. The long series of operation process includes the inflow, outflow, water supply flow, water level, reservoir capacity of the water supply reservoir in each time period during the long series of operation period, and the inflow, outflow, storage flow, water supply flow, water level, reservoir capacity of the storage reservoir in each time period during the long series of operation period.

[0123] Specifically, the preset requirement includes the preset completion degree of the water supply target of the diversion project and the preset completion degree of the task index of the diversion project. Among them, the water supply target includes the domestic water supply target, the industrial water supply target, the agricultural irrigation water supply target, etc.; the task index includes the water supply guarantee rate and the water supply safety degree of each water supply target. Generally, the water supply guarantee rate of domestic water supply is 95%, and the water supply safety degree is 70%; the water supply guarantee rate of agricultural irrigation is 75%, and the water supply safety degree is 50%.

[0124] According to the long series of operation process obtained by the first simulation operation, the embodiment determines the effect of the first simulation operation, which includes the simulation completion degree of each water supply target and the simulation completion degree of each task index of the diversion project in the first simulation operation. Then, the embodiment compares each simulation completion degree in the effect with each preset completion degree in the preset requirement one by one, so as to determine whether the effect of the first simulation operation meets the preset requirement.

[0125] If the effect of the first simulation operation does not meet the preset requirement, step S42 is performed.

[0126] S42, adjust the division mode of the first scheduling period and the second scheduling period, and / or adjust the plurality of correlation factors, and repeat the execution of S1 to S41.

[0127] The embodiment can adjust the division mode of the first scheduling period and the second scheduling period by adjusting the first preset runoff, the second preset runoff, the first preset water demand, and the second preset water demand. The embodiment can adjust the plurality of correlation factors by increasing or decreasing the correlation factors, and reselecting the correlation factors, and the like. After adjusting the division mode of the first scheduling period and the second scheduling period, and / or adjusting the plurality of correlation factors, the embodiment repeats the execution of S1 to S41 until the effect of the first simulation operation meets the preset requirement.

[0128] If the effect of the first simulation operation meets the preset requirement, step S43 is executed.

[0129] S43, based on the current hydrological data, performing a second simulation operation on the water supply reservoir and the storage reservoir by using the joint scheduling model, and determining the joint scheduling scheme of the water supply reservoir and the storage reservoir according to the result of the second simulation operation.

[0130] The result of the second simulation operation includes the selection of the plurality of correlation factors, the division of the first scheduling period and the second scheduling period, the storage index of the first scheduling period and the second scheduling period, and the operation process of the second simulation operation, and the like.

[0131] It can be understood that when the effect of the first simulation operation meets the preset requirement, it means that the selection of the plurality of correlation factors in the joint scheduling model, the division mode of the first scheduling period and the second scheduling period, and the setting of the storage index of the first scheduling period and the second scheduling period are all optimal. Therefore, after the joint scheduling model performs the second simulation operation based on the current hydrological data and the current water demand data, the obtained operation process can be used as the optimal operation process of the diversion project. The operation process includes the inflow, outflow, water supply flow, water level, and storage capacity of the water supply reservoir in the current scheduling period, and the inflow, outflow, storage flow, water supply flow, water level, and storage capacity of the storage reservoir in the current scheduling period. According to the operation process, the joint scheduling scheme of the water supply reservoir and the storage reservoir can be determined.

[0132] The implementation process and implementation effect of the method will be described below by taking a large-scale diversion project in the west of China as an example.

[0133] The topological structure of the example diversion project is shown in Figure 2 The related parameters of the water supply reservoir of the trunk stream and the storage reservoir of the branch stream are shown in Table 1.

[0134] Table 1 Related parameters of the water supply reservoir and the storage reservoir

[0135]

[0136] Firstly, the annual variation trend of the mean annual runoff of the main stream is determined according to the long series of hydrological data of the main stream, and the annual variation of the water consumption for residents' life and agricultural irrigation in the water supply target of the water supply reservoir of the main stream is determined, then according to the first preset runoff, the second preset runoff, the first preset water demand and the second preset water demand, the period with abundant runoff and less water consumption in a year (from June to October) is divided as the first dispatching period, and the period with less runoff and more water consumption in a year (from November to May of next year) is divided as the second dispatching period.

[0137] Then, a plurality of correlation factors are selected, the plurality of correlation factors include the division mode of the first dispatching period and the second dispatching period, the hydraulic connection between the water supply reservoir and the storage reservoir, the spatial relationship between the water supply reservoir and the storage reservoir, the regulation and storage capacity of the main-branch diversion project, the water supply target of the main-branch diversion project, the task index of the main-branch diversion project and the like. The correlation degrees of each correlation factor and the storage index are quantitatively calculated by using the grey correlation degree method, and the weight standardization processing is performed on each correlation degree to obtain the weight coefficient of each correlation factor, and then the storage index of the first dispatching period and the second dispatching period is determined according to the weight coefficient of each correlation factor and the time series of each correlation factor.

[0138] Subsequently, the joint dispatching model including the storage sub-model and the joint water supply sub-model is constructed according to the storage index of the first dispatching period and the second dispatching period. At the same time, the long series of runoff data of the main-branch diversion from 1960 to 2022 (including the natural monthly runoff process of the water supply reservoir of the main stream and the natural monthly runoff process of the storage reservoir of the branch stream) is adopted, and the long series of water demand data of residents' life and agricultural irrigation from 1960 to 2022 is simultaneously determined by measurement (including the monthly water consumption process of residents' life and the monthly water consumption process of agricultural irrigation).

[0139] Further, based on the above long series of runoff data of the main-branch diversion and the long series of water demand data, the joint dispatching model is used to perform the first simulation operation on the water supply reservoir and the storage reservoir and determine the first simulation operation. Specifically, the operation water level of the water supply reservoir of the main stream and the storage reservoir of the branch stream is taken as the decision variable of the joint dispatching model, the data calculation step is selected as the monthly scale, the long series of runoff data of the main-branch diversion and the long series of water demand data are discretized, then the joint solution of the storage sub-model and the joint water supply sub-model is obtained, and the long series of operation processes of the first simulation operation is obtained.

[0140] The task indicators set by the embodiment for each water supply target include: the water supply guarantee rate of resident life is 95%, and the water supply safety degree is 70%; the water supply guarantee rate of agricultural irrigation is 75%, and the water supply safety degree is 50%. According to the long series of operation processes obtained by the first simulation operation, the simulation completion degrees of the diversion-distribution project to each task indicator are calculated according to the statistical method of the water supply guarantee rate and the water supply safety degree, and then the simulation completion degrees are compared with the preset completion degrees to determine whether the simulation completion degrees reach the preset completion degrees. If not, the division mode of the first scheduling period and the second scheduling period is adjusted, and / or the storage indexes of the first scheduling period and the second scheduling period are corrected by adjusting the plurality of correlation factors, so as to optimize the joint scheduling model, until the simulation completion degrees reach the preset completion degrees. At this time, the selection of the plurality of correlation factors in the joint scheduling model, the division mode of the first scheduling period and the second scheduling period, and the setting of the storage indexes of the first scheduling period and the second scheduling period are all optimal.

[0141] After obtaining the optimal joint scheduling model, the embodiment performs the second simulation operation on the water supply reservoir and the storage reservoir based on the current hydrological data and the current water demand data, and part of the results of the second simulation operation are shown in Table 2.

[0142] Table 2 Part of the results of the second simulation operation

[0143]

[0144] According to the existing relevant standards, the water supply guarantee rate of resident life is 95%, and the water supply safety degree is 70%; the water supply guarantee rate of agricultural irrigation is 75%, and the water supply safety degree is 50%. As can be seen from Table 2, after using the method of the embodiment, the water supply guarantee rate and the water supply safety degree of resident life, and the water supply guarantee rate and the water supply safety degree of agricultural irrigation all exceed the corresponding task indicators, which indicates that the method of the embodiment can effectively improve the complementary performance between the main stream water supply reservoir and the branch stream storage reservoir, can fully play the operation characteristics between the main stream and branch stream reservoirs, and can ensure that the joint scheduling process of the diversion-distribution project meets the requirements of the water supply target and the related task indicators.

[0145] In addition to the part of the results shown in Table 2, the results of the second simulation operation also include the operation processes of the water supply reservoir and the storage reservoir in the current scheduling period, such as the inflow, outflow, water supply flow, water level, and storage capacity of the water supply reservoir in the current scheduling period, and the inflow, outflow, storage flow, water supply flow, water level, and storage capacity of the storage reservoir in the current scheduling period. According to the above results, the embodiment can formulate the joint scheduling scheme of the water supply reservoir and the storage reservoir, as shown in Table 3 and Table 4, so as to provide a scientific reference for the efficient scheduling operation of the diversion-distribution project. Figure 3 and Figure 4 ​

[0146] The embodiment divides the scheduling period into a first scheduling period and a second scheduling period according to the hydrological information of the dry flow and the water demand information of the water users, so as to clearly distinguish the main operation states of the storage reservoirs in time (mainly storing water in the first scheduling period and mainly supplementing water in the second scheduling period); then determines the water storage indexes of the two scheduling periods respectively according to a plurality of correlation factors, and constructs a joint scheduling model based on the two water storage indexes, so as to ensure that the joint scheduling model can jointly optimize the operation processes of the two reservoirs based on the operation states of the different scheduling periods, and finally obtains the joint scheduling scheme by simulating and iteratively optimizing the joint scheduling model. In this way, the joint scheduling process of the diversion and distribution project can be closely related to the hydrological regime, the water demand of the water users, and the topological relationship between the two reservoirs and other factors, so as to ensure the coordinated matching of the supply and storage processes, timely meet the water supply demand, and effectively improve the water resource utilization rate and the operation efficiency of the project.

[0147] The above is only a few embodiments of the present application, and does not limit the present application in any form. Although the above describes the preferred embodiments of the present application, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical contents without departing from the scope of the technical solutions of the present application, and such changes or modifications are equivalent to equivalent embodiments, and are within the scope of the technical solutions.

Claims

1. A joint scheduling method for water diversion projects based on water storage index, characterized in that, The main stream-to-tributary water diversion project includes a water supply reservoir located on the main stream and a storage reservoir located on the tributary. The water supply reservoir is used to supply water to water users using the water volume of the main stream, and the storage reservoir is used to store water from the main stream and replenish the water supply reservoir. The method includes: S1. Based on the hydrological information of the main stream and the water demand information of the water users, the scheduling period is divided into a first scheduling period when the water storage is greater than the water replenishment and a second scheduling period when the water storage is less than the water replenishment. S2. Determine multiple correlation factors for the water storage index, wherein the water storage index is the proportion of water stored in the storage reservoir out of the total water volume of the main stream during the same scheduling period; determine the correlation degree between each correlation factor and the water storage index using the grey relational analysis method; determine the weight coefficient of each correlation factor based on all correlation degrees; determine the water storage index for the first scheduling period based on the weight coefficient of each correlation factor and the time series of each correlation factor in the first scheduling period; determine the water storage index for the second scheduling period based on the weight coefficient of each correlation factor and the time series of each correlation factor in the second scheduling period. S3. Determine a first objective function and a second objective function based on the water storage index of the first scheduling period and the second scheduling period, respectively. The first objective function / second objective function is used to minimize the water storage flow of the storage reservoir during the first scheduling period / second scheduling period. Determine a third objective function, which is used to maximize the water supply flow of the water supply reservoir during the scheduling period. Construct a joint scheduling model of the water supply reservoir and the storage reservoir based on the first objective function, the second objective function and the third objective function. S4. Determine the joint scheduling scheme of the water supply reservoir and the storage reservoir using the joint scheduling model; S4 specifically includes: S41. Based on the historical hydrological data of the main stream and the tributary, the first simulation operation of the water supply reservoir and the storage reservoir is carried out using the joint scheduling model, and it is determined whether the effect of the first simulation operation meets the preset requirements. If not, proceed to step S42; if yes, proceed to step S43. S42. Adjust the division method of the first scheduling period and the second scheduling period, and / or adjust multiple correlation factors, and repeat S1 to S41; S43. Based on the current hydrological data, a second simulation operation is conducted on the water supply reservoir and the storage reservoir using the joint scheduling model, and a joint scheduling scheme for the water supply reservoir and the storage reservoir is determined based on the results of the second simulation operation.

2. The method according to claim 1, characterized in that, The hydrological information includes runoff during multiple time periods within the scheduling period; the water demand information includes water demand during multiple time periods within the scheduling period; S1 specifically includes: The first scheduling period is defined as the time period during which the runoff of the main stream is greater than the first preset runoff and the water demand of the water user is less than the first preset water demand. The period during which the runoff of the main stream is less than the second preset runoff and the water demand of the water user is greater than the second preset water demand is defined as the second scheduling period.

3. The method according to claim 1, characterized in that, A joint scheduling model for the water supply reservoir and the storage reservoir is constructed based on the first objective function, the second objective function, and the third objective function, specifically including: Based on the first objective function, the second objective function, and the design parameters of the reservoir, a water storage sub-model of the reservoir is constructed. Based on the third objective function, the design parameters of the water supply reservoir and the design parameters of the storage reservoir, a joint water supply sub-model of the water supply reservoir and the storage reservoir is constructed. The storage sub-model and the joint water supply sub-model constitute the joint scheduling model.

4. The method according to claim 3, characterized in that, Based on the first objective function, the second objective function, and the design parameters of the reservoir, a water storage sub-model of the reservoir is constructed, specifically including: The first constraint condition is determined based on the design parameters of the reservoir, and the first constraint condition is used to constrain the first operating parameters of the reservoir. The water storage sub-model is constructed based on the first objective function, the second objective function, and the first constraint condition.

5. The method according to claim 1, characterized in that, Based on the water storage index of the first scheduling period and the second scheduling period respectively, a first objective function and a second objective function are determined, specifically including: The first objective function is constructed based on the water storage index and the main stream water volume during the first scheduling period. The second objective function is constructed based on the water storage index and the main stream water volume during the second scheduling period.

6. The method according to claim 3, characterized in that, Based on the third objective function, the design parameters of the water supply reservoir, and the design parameters of the storage reservoir, a joint water supply sub-model of the water supply reservoir and the storage reservoir is constructed, specifically including: The second constraint condition is determined based on the design parameters of the water supply reservoir and the storage reservoir. The second constraint condition is used to constrain the operating parameters of the water supply reservoir and the second operating parameters of the storage reservoir. The joint water supply sub-model is constructed based on the third objective function and the second constraint.

7. The method according to claim 1, characterized in that, The multiple correlation factors include at least two of the following: the division method of the first scheduling period and the second scheduling period; the hydraulic connection between the water supply reservoir and the storage reservoir; the spatial relationship between the water supply reservoir and the storage reservoir; the regulation and storage capacity of the diversion project; the water supply target of the diversion project; and the task indicators of the diversion project.

Images