A joint scheduling method based on multiple water sources and multiple objectives

Abstract

The present invention discloses a joint scheduling method based on multiple water sources and multiple targets, which belongs to the technical field of water resource scheduling. It can solve the problem that the water transfer process of the existing scheduling method fluctuates greatly and it is difficult to guarantee multiple water supply demands. The method includes: S1, determining the target water transfer flow rate of the water transfer project to the water supply project and multiple target water supply flows of the water supply project; S2, constructing a joint scheduling model according to the target water transfer flow rate, multiple target water supply flows and design parameters of the water supply project, and determining multiple groups of simulation operation data of the water transfer project and the water supply project in each of multiple calculation periods according to the long series of hydrological data of the water transfer project and the water supply project and using the joint scheduling model; S3, determining the joint scheduling rules of the water transfer project and the water supply project according to the multiple groups of simulation operation data of each calculation period; and scheduling the water transfer project and the water supply project according to the joint scheduling rules. The present invention is used for water resource scheduling.

Description

Technical Field

[0001] The invention relates to a joint dispatching method based on multiple water sources and multiple targets, belonging to the technical field of water resource dispatching. Background Art

[0002] my country has successively built inter-basin water transfer projects of different levels and types, which have played a key role in alleviating the shortage of water resources in water-scarce basins and improving regional water security. In recent years, affected by climate change and frequent extreme weather, the runoff of inter-basin water transfer projects has fluctuated greatly, while the regulation capacity of existing water transfer projects is relatively weak, and they are subject to increasingly stringent ecological control, resulting in large fluctuations in the actual water transfer process in the water transfer area. At the same time, with the economic and social development of the water receiving areas of the water transfer projects, the water users and their water demand in the water receiving areas have also changed greatly. As a result, due to the dynamic changes in the supply and demand sides of the water transfer and receiving areas, the water transfer process of inter-basin water transfer projects often presents the characteristics of instability and large fluctuations, resulting in the situation that the water receiving areas are difficult to directly receive the water transfer process. Therefore, after the water transfer project transports the external water to the water receiving area, it is also necessary to carry out water supply scheduling through the water supply project in the water receiving area to facilitate the water users in the water receiving area to effectively use the external water.

[0003] In practice, water supply projects in the receiving area usually include multiple reservoirs. As key projects for river runoff regulation and water resources development and utilization, reservoirs mainly undertake daily water supply tasks such as urban life production water supply, agricultural irrigation, and ecological water replenishment. In recent years, with the requirements of economic and social development for water security, reservoirs need to undertake emergency water supply tasks in the event of accidents or disasters while undertaking daily water supply tasks. However, the emergency water supply task meets an abnormal demand, and its start timing and emergency duration are all random and accidental, which is significantly different from the daily water supply task. Since each water supply task corresponds to a water supply target, as the tasks undertaken by the reservoir increase, it needs to meet multiple water supply targets at the same time, mainly involving improving external water transfer, ensuring local daily water supply, and responding to emergency water supply. These targets are staggered in time and space, which increases the complexity of the water supply process. At the same time, the natural runoff in the receiving area is also changing dynamically. The water supply project also needs to be jointly dispatched with the water transfer project to coordinate the complementary relationship between multiple water sources such as external water transfer and local runoff. However, existing scheduling methods can usually only cope with daily water supply targets. When faced with complex scheduling tasks with multiple water sources and multiple targets, they are often unable to fully coordinate multiple water sources and multiple water supply targets, resulting in large fluctuations in the water transfer process and difficulty in effectively guaranteeing multiple water supply needs, resulting in inefficient use of water resources. Summary of the invention

[0004] The present invention provides a joint scheduling method based on multiple water sources and multiple targets, which can solve the problem that the existing scheduling method cannot fully coordinate multiple water sources and multiple water supply targets, resulting in large fluctuations in the water transfer process and difficulty in ensuring multiple water supply needs.

[0005] The present invention provides a joint scheduling method based on multiple water sources and multiple objectives, the method comprising:

[0006] S1. Determine a target water diversion flow rate for diverting water from a water diversion project to a water supply project and a plurality of target water supply flows of the water supply project;

[0007] S2. Constructing a joint dispatching model for optimizing the water transfer flow rate variation of the water transfer project according to the target water transfer flow rate, multiple target water supply flow rates and design parameters of the water supply project, and determining multiple groups of simulation operation data of the water transfer project and the water supply project in each of multiple calculation periods according to a long series of hydrological data of the water transfer project and the water supply project and using the joint dispatching model;

[0008] S3. Determine the joint dispatching rules of the water diversion project and the water supply project according to multiple groups of simulation operation data in each calculation period; and dispatch the water diversion project and the water supply project according to the joint dispatching rules.

[0009] Optionally, the joint scheduling model includes an objective function and constraints, and the objective function is used to optimize the water diversion flow rate variation of the water diversion project.

[0010] Optionally, in S2, a joint scheduling model is constructed according to the target water transfer flow, multiple target water supply flows and design parameters of the water supply project, specifically:

[0011] Establishing the objective function according to the target water transfer flow rate;

[0012] The constraint conditions are established according to a plurality of target water supply flows and design parameters of the water supply project.

[0013] Optionally, in S2, based on the long series of hydrological data of the water diversion project and the water supply project, and using the joint scheduling model, multiple groups of simulation operation data of the water diversion project and the water supply project in each of multiple calculation periods are determined, specifically:

[0014] According to the long series of hydrological data of the water diversion project and the water supply project, and using the objective function and the constraint conditions, a plurality of water diversion flow rate fluctuations of the water diversion project in each of a plurality of calculation periods are determined;

[0015] According to the multiple water diversion flow rate fluctuations and the objective function, multiple groups of simulation operation data of the water diversion project and the water supply project in each calculation period in multiple calculation periods are determined; the multiple groups of simulation operation data correspond one-to-one to the multiple water diversion flow rate fluctuations.

[0016] Optionally, the joint dispatching rules of the water diversion project and the water supply project are determined in S3 according to multiple groups of simulation operation data in each calculation period, specifically:

[0017] According to the magnitudes of the multiple water diversion flow rate fluctuations corresponding to the multiple sets of simulation operation data in each calculation period, the multiple sets of simulation operation data in each calculation period are sorted, and the joint scheduling rules of the water diversion project and the water supply project are determined according to the sorting results.

[0018] Optionally, the S1 is specifically:

[0019] Determine multiple target water supply flows of the water supply project according to multiple water demands of the water use area, wherein the multiple water demands correspond to the multiple target water supply flows one by one;

[0020] The target water diversion flow rate of the water diversion project to the water supply project is determined according to the natural runoff of the water supply project and multiple target water supply flow rates.

[0021] Optionally, the water supply project is a group of reservoirs.

[0022] Optionally, the reservoir group is a cascade reservoir group.

[0023] Optionally, the multiple target water supply flow rates include a daily water supply target flow rate and an emergency water supply target flow rate.

[0024] Optionally, after determining the joint dispatching rules of the water diversion project and the water supply project, the method further includes:

[0025] Performing simulated scheduling operation on the water diversion project and the water supply project according to the joint scheduling rule, and adjusting the joint scheduling rule when the simulated scheduling operation result does not meet the preset operation conditions;

[0026] Accordingly, in S3, the water diversion project and the water supply project are scheduled according to the joint scheduling rule, specifically:

[0027] The water diversion project and the water supply project are dispatched according to the adjusted joint dispatching rules.

[0028] The beneficial effects that the present invention can produce include:

[0029] The present invention optimizes the water diversion flow rate of the water diversion project according to the target water diversion flow rate of the water diversion project and the multiple target water supply flow rates of the water supply project, as well as the long series of hydrological data of the water diversion project and the water supply project, so as to determine multiple groups of simulation operation data corresponding to each calculation period of the water diversion project and the water supply project, and then determines the scheduling rules according to the multiple groups of simulation operation data of each calculation period. In this way, multiple water sources and multiple water supply targets can be fully coordinated, and the water diversion process and the water supply process can be matched with multiple water supply targets while ensuring that the water diversion process is uniform and stable, thereby realizing the improvement of the water diversion process and the achievement of multiple water supply targets, which is conducive to giving full play to the effectiveness of the water diversion project and the water supply project and significantly improving the utilization efficiency of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A flowchart of a joint scheduling method based on multiple water sources and multiple objectives provided in an embodiment of the present invention;

[0031] Figure 2 An implementation flow chart of an example provided for an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the topological relationship of the Jinjing-Jinpen cascade reservoir group provided in an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the simulated operation process of the Jinpen Reservoir provided in an embodiment of the present invention;

[0034] Figure 5 A schematic diagram of the simulated operation process of the Jinjing Reservoir provided in an embodiment of the present invention;

[0035] Figure 6 A comparison chart of improvements in the Han-Wei water diversion process provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with embodiments, but the present invention is not limited to these embodiments.

[0037] The embodiment of the present invention provides a joint scheduling method based on multiple water sources and multiple objectives, such as Figure 1 As shown, the method includes:

[0038] S1. determining a target water diversion flow rate for diverting water from a water diversion project to a water supply project and multiple target water supply flows for the water supply project;

[0039] S2. A joint dispatching model for optimizing the water diversion flow rate of the water diversion project is constructed according to the target water diversion flow rate, multiple target water supply flow rates and design parameters of the water supply project. According to the long series of hydrological data of the water diversion project and the water supply project, multiple groups of simulation operation data of the water diversion project and the water supply project in each of the multiple calculation periods are determined by using the joint dispatching model.

[0040] S3. Determine the joint dispatching rules of the water diversion project and the water supply project according to the multiple groups of simulation operation data in each calculation period; and dispatch the water diversion project and the water supply project according to the joint dispatching rules.

[0041] In practice, water diversion projects are located outside the water use area and are used to dispatch water resources from other river basins to the water use area; water supply projects are located within the water use area and are used to supply water to the water use area based on the water diversion flow of the water diversion project and its natural runoff.

[0042] Specifically, a water supply project may include one or more reservoirs. In practice, a single reservoir has limited dispatching capacity due to factors such as design parameters, hydrological conditions, and operational efficiency. Therefore, a water supply project should adopt a reservoir group formed by multiple reservoirs, especially a cascade reservoir group with strong hydraulic connections. By jointly dispatching the reservoir group, it is beneficial to improve the dispatching capacity of the water supply project and meet the diverse water needs.

[0043] In this embodiment, S1 may specifically be:

[0044] Determine multiple target water supply flows of the water supply project according to multiple water demands of the water use area, and the multiple water demands correspond to the multiple target water supply flows one by one;

[0045] The target water diversion flow rate for diverting water from the water diversion project to the water supply project is determined based on the natural runoff of the water supply project and multiple target water supply flows.

[0046] Specifically, in order to improve the unevenness of the water diversion process, the target water diversion flow rate should be set as a constant value that does not change with time.

[0047] Specifically, the multiple target water supply flow rates may include daily water supply target flow rates and emergency water supply target flow rates. Among them, the daily water supply target flow rate may include urban life production target water supply flow rate, agricultural irrigation target water supply flow rate, and ecological water replenishment target water supply flow rate, etc., and the emergency water supply target flow rate may include drought emergency target water supply flow rate and accident emergency target water supply flow rate, etc. Each target water supply flow rate can be flexibly set according to the corresponding water demand.

[0048] It can be seen that this embodiment involves multiple targets, including a water transfer target and multiple water supply targets, and the multiple water supply targets include daily water supply targets, emergency water supply targets, etc. This embodiment classifies and divides the multiple targets.

[0049] Specifically, this embodiment divides the targets into external domain targets and local domain targets according to the areas to which the targets correspond. The areas to which the targets correspond are outside the water use area and are external domain targets, while the areas to which the targets correspond are inside the water use area and are local domain targets. For example, the area to which the water transfer target corresponds is outside the water use area, so the water transfer target is an external domain target, and the area to which the water supply target corresponds is inside the water use area, so the water supply target is a local domain target. At the same time, this embodiment also divides the targets into normal targets and emergency targets according to the timing states to which the targets correspond. The timing states to which the targets correspond are long-term continuous, which are normal targets, and the timing states to which the targets correspond are short-term sudden, which are emergency targets.

[0050] Furthermore, this embodiment also classifies and divides various types of water resources involved in the water transfer process and the water supply process.

[0051] Specifically, this embodiment divides water resources into external water transfer and local runoff according to the area where the water resources are located. Water resources outside the water use area are external water transfer, and water resources within the water use area are local runoff. In this embodiment, water transfer from the water transfer project to the water supply project is external water transfer, and the natural runoff of the water supply project is local runoff, thereby forming multiple water sources. At the same time, this implementation also divides water resources into pumped water volume and gravity water volume according to the way water resources are introduced by the water supply project. Among them, the water volume that needs to be pumped and introduced by the pump station consuming electric energy is the pumped water volume, and the water volume that is directly introduced by the gravity of the water resources itself without the need for pumping and consuming energy by the pump station is the gravity water volume.

[0052] Specifically, the design parameters of a water supply project may include information such as the design storage capacity of each reservoir and pump station parameters.

[0053] Specifically, this embodiment inputs a long series of hydrological data of the water diversion project and the water supply project into the joint scheduling model, performs simulation operation on the water diversion project and the water supply project, and thus obtains simulation operation data.

[0054] Specifically, the simulation operation data may include the simulated water diversion flow of the water diversion project, as well as the simulated daily water supply flow, simulated emergency water supply flow and simulated reservoir water level of the water supply project.

[0055] In practice, the long series of hydrological data can be discretized according to the length of the calculation period, so that each calculation period has multiple sets of corresponding hydrological data of the same period. After running simulations using multiple sets of discretized hydrological data of each calculation period, multiple sets of simulation operation data of each calculation period can be obtained.

[0056] For example, the design calculation period is 1 month, and 12 calculation periods (i.e. 1 year) are planned to be calculated. If a 30-year long series of hydrological data is selected and the 30-year long series of hydrological data is discretized according to the duration of months, each calculation period will have 30 sets of corresponding hydrological data in the same period. For example, after the 30-year long series of hydrological data is discretized, 30 hydrological data in March can be obtained, so the calculation period in March corresponds to 30 sets of hydrological data in the same period. After the 30 sets of hydrological data in the same period are input into the joint scheduling model for simulation operation, 30 sets of simulation operation data for the calculation period can be obtained.

[0057] Specifically, the length and number of the calculation periods can be set according to the scheduling requirements. For example, the length of the calculation period can be one week, ten days, one month, one quarter, etc.; the number of calculation periods can be 4, 6, 12, 24, etc.

[0058] Specifically, the joint dispatching model includes an objective function and constraints, and the objective function is used to optimize the water diversion flow rate variation of the water diversion project. The water diversion flow rate variation refers to the variation range of the simulated water diversion flow of the water diversion project relative to the target water diversion flow rate.

[0059] Furthermore, in S2, a joint scheduling model is constructed according to the target water transfer flow, multiple target water supply flows and design parameters of the water supply project, which can be specifically:

[0060] Establishing an objective function according to the target water transfer flow rate;

[0061] Establish constraints based on multiple target water supply flows and design parameters of the water supply project.

[0062] Furthermore, in S2, based on the long series of hydrological data of the water diversion project and the water supply project, and using the joint scheduling model, multiple groups of simulation operation data of the water diversion project and the water supply project in each of the multiple calculation periods are determined, which can be specifically:

[0063] According to the long series of hydrological data of water diversion project and water supply project, and using the objective function and constraint conditions, multiple water diversion flow fluctuations of water diversion project in each calculation period in multiple calculation periods are determined;

[0064] According to multiple water diversion flow rate fluctuations and objective functions, multiple groups of simulation operation data for the water diversion project and the water supply project in each of multiple calculation periods are determined; the multiple groups of simulation operation data correspond one-to-one to the multiple water diversion flow rate fluctuations.

[0065] Specifically, the expression of the objective function is:

[0066] (1)

[0067] In formula (1), For the water diversion project The water flow variation within a calculation period; The target water diversion flow rate for the water diversion project; For the water diversion project The simulated water diversion flow rate within a calculation period is ; is the total number of calculation periods.

[0068] Among them, the target water transfer flow It can be set comprehensively according to the water demand of the water use area. In this embodiment, the target water flow rate is is a fixed value that does not change with time, that is, the target water diversion flow corresponding to any calculation period are the same, which is conducive to ensuring the uniformity and stability of the water transfer process.

[0069] In this embodiment, the objective function aims to determine the minimum water flow rate variation.

[0070] Specifically, after the long series of hydrological data of water diversion projects and water supply projects are discretized as described above, the Using multiple sets of hydrological data from the same period to simulate the water diversion process, we can get the Multiple simulated water transfer flows corresponding to calculation periods , multiple simulated water flow Input into formula (1), and we can get Multiple water flow rate fluctuations corresponding to calculation periods In this embodiment, the smallest one is determined as the The minimum water diversion flow amplitude in a calculation period. It is worth noting that the above calculation process does not consider whether the water diversion process meets the water supply target and the safe operation conditions of the water supply project. In actual calculations, when the water diversion process corresponding to a certain water diversion flow amplitude cannot meet the water supply target or cannot ensure the safe operation of the water supply project, the water diversion flow amplitude should be discarded and the minimum water diversion flow amplitude should be determined among the remaining multiple water diversion flow amplitudes.

[0071] Therefore, this embodiment establishes constraint conditions based on the design parameters of the water supply project and multiple target water supply flow rates to ensure the rationality of the minimum water diversion flow rate variation.

[0072] It is worth noting that when the water supply project is a cascade reservoir group, the topological relationship of the cascade reservoir group can be determined based on the location relationship and hydraulic connection between the reservoirs, as well as the regulation capacity and functional positioning of each reservoir, and then the constraints can be established based on the topological relationship and the design parameters of each reservoir. Among them, the location relationship refers to the position relationship and elevation relationship between the reservoirs; the hydraulic connection refers to the water replenishment relationship between the reservoirs; the regulation capacity corresponds to the storage capacity of the reservoir. The reservoir with a large storage capacity has a stronger regulation capacity and can bear more external domain goals, while the reservoir with a low regulation capacity can bear more local domain goals; the functional positioning refers to the functions and roles of the reservoir in the water supply project. Generally, the reservoir with more functions starts the dispatching operation quickly and should bear more emergency goals, while the reservoir with fewer functions starts the dispatching operation slowly and should bear more normal goals.

[0073] Specifically, the constraints include:

[0074] 1. Constraints on water supply guarantee rate:

[0075] (2)

[0076] In formula (2), Indicates the corresponding target of water supply project The actual water supply guarantee rate; Indicates the corresponding target of water supply project In this embodiment, Represents urban life, production and water supply, Represents agricultural irrigation.

[0077] 2. Water supply constraints:

[0078] (3)

[0079] In formula (3), Indicates the corresponding target of water supply project The actual water supply; Indicates the corresponding target of water supply project In this embodiment, Represents urban life, production and water supply, Represents agricultural irrigation.

[0080] 3. Emergency water supply constraints:

[0081] (4)

[0082] In formula (4), The reservoir for the water supply project is located in The emergency water volume stored in a calculation period should take the maximum value of the water volume corresponding to various emergency targets. This embodiment mainly considers the drought emergency water volume and accident emergency water volume of the water-using area. Specifically, The water volume for drought emergency protection per unit time; Provide emergency protection for drought relief; The amount of water guaranteed for accident emergency per unit time; Provide emergency response time for accidents.

[0083] 4. Reservoir water balance constraints:

[0084] (5)

[0085] In formula (5), For the reservoir in the water supply project In the The amount of water stored in the reservoir during the calculation period; For the reservoir In the The amount of water stored in the reservoir during the calculation period; For the reservoir In the Inbound flow in a calculation period; For the reservoir In the Outbound flow in a calculation period; The duration of the calculation period, in hours.

[0086] 5. Reservoir capacity constraints:

[0087] (6)

[0088] In formula (6), For the reservoir In the The minimum storage capacity within a calculation period; For the reservoir In the The maximum storage capacity within a calculation period; and Both can be determined according to the design parameters of the reservoir.

[0089] It is worth noting that when the water supply project is a cascade reservoir group, there is a water replenishment relationship between the upstream and downstream reservoirs. At this time, it is also necessary to introduce water replenishment flow constraints, namely:

[0090] 6. Constraints on water replenishment flow of cascade reservoirs:

[0091] (7)

[0092] In formula (7), For the The upstream reservoir in the cascade reservoir group within the calculation period Downstream reservoirs The water replenishment flow rate is shown in the arrow As shown, For upstream reservoir Downstream reservoirs Maximum water replenishment flow.

[0093] It is worth noting that when a cascade reservoir group needs to use pumping stations to pump water into the reservoir, it is also necessary to introduce pumping station pumping flow constraints.

[0094] 7. Pumping flow constraints of cascade reservoir pumping stations:

[0095] (8)

[0096] In formula (8), For the The actual flow rate pumped into the cascade reservoirs by the pumping station during a calculation period; For the The flow rate that needs to be improved by external water transfer within a calculation period; Design the maximum pumping flow rate for the pump station. It can be determined during the calculation of the minimum water diversion flow range.

[0097] According to the above objective function and constraints, it can be seen that this embodiment determines multiple water supply targets such as normal targets and emergency targets as rigid targets, sets them as constraints to give priority protection, and determines the uniform improvement of the water transfer process as a flexible target, sets it as the objective function to optimize it as much as possible, thereby converting multi-objective optimization into single-objective solution, which is conducive to simplifying the calculation process and improving calculation efficiency.

[0098] Specifically, this embodiment can also determine a preset range of water flow rate variation, and perform iterative convergence solution on the objective function in combination with the target classification result and the constraint conditions until the minimum water flow rate variation obtained satisfies the preset range.

[0099] Specifically, the iterative convergence solution process of this embodiment is: discretize the long series of hydrological data into calculation periods that meet the requirements of calculation accuracy and operation efficiency, use the objective function, combine the target classification results and constraints, and iterate the calculation in a unit calculation period step by step, so that the water flow rate fluctuation is close to the preset range. If the preset range is reached, the calculation is stopped, and the objective function outputs the minimum water flow fluctuation; if the preset range is not reached, the calculation is continued until the preset range is reached, and the objective function outputs the minimum water flow fluctuation.

[0100] It is worth noting that the process of calculating the water diversion flow amplitude based on the long series of hydrological data is actually the simulation operation process of the water diversion project and the water supply project. Through the simulation operation, the simulated daily water supply flow, simulated emergency water supply flow, simulated reservoir water level, and simulated water diversion flow of the water diversion project can be obtained. Simulation operation data, and then the corresponding water diversion flow amplitude can be obtained based on the simulation operation data. Therefore, through the above calculation process, the objective function establishes a one-to-one correspondence between multiple water diversion flow amplitudes and multiple sets of simulation operation data in each calculation period.

[0101] Therefore, after obtaining the minimum water diversion flow amplitude of each calculation period, this embodiment can determine a group of simulation operation data corresponding to the minimum water diversion flow amplitude by finding the correspondence between multiple water diversion flow amplitudes and multiple groups of simulation operation data in the calculation period. The simulated water diversion flow in this group of simulation operation data is the optimal water diversion flow of the calculation period, and the water diversion process and water supply process corresponding to this group of simulation operation data are the optimal scheduling plan for the calculation period. The optimal scheduling plan can meet the goal of improving the uniformity of the water diversion process and multiple water supply goals.

[0102] However, in the actual operation of water diversion projects and water supply projects, affected by various factors such as changes in natural runoff and changes in water supply demand, the water diversion process and the water supply process are in dynamic change. Scheduling according to the above-mentioned optimal scheduling scheme may conflict with the actual operation of the water diversion project and the water supply project. Therefore, the above-mentioned optimal scheduling scheme is only a theoretical optimal scheduling scheme and may not be applicable in actual scheduling. When the optimal scheduling scheme is not applicable, it is necessary to provide other applicable scheduling schemes. The joint scheduling scheme of this embodiment includes multiple scheduling schemes corresponding to each calculation period, so that in practice, a suitable scheduling scheme can be selected according to the actual situation.

[0103] Specifically, in S3, the joint dispatching rules of the water diversion project and the water supply project are determined according to multiple groups of simulation operation data in each calculation period, which can be:

[0104] According to the magnitudes of the multiple water diversion flow rate fluctuations corresponding to the multiple sets of simulation operation data in each calculation period, the multiple sets of simulation operation data in each calculation period are sorted, and the joint dispatching rules of the water diversion project and the water supply project are determined according to the sorting results.

[0105] For example, multiple groups of simulation operation data are sorted in the order of water diversion flow rate variation from small to large, and the sorting results are shown in Table 1.

[0106] Table 1 Sorting table of multiple groups of simulation operation data in each calculation period

[0107]

[0108] Specifically, when the water supply project is a reservoir group, the reservoirs in the reservoir group that have a regulating effect on both the water diversion process and the water supply process can be determined as regulating reservoirs based on the topological relationship of the reservoir group, and the water level of the regulating reservoir will be used as a discriminant parameter for the subsequent determination of the scheduling plan.

[0109] As can be seen from Table 1, each calculation period corresponds to multiple sets of simulation operation data. The water flow rate fluctuation corresponding to the simulation operation data in the first row of each calculation period is the minimum water flow rate fluctuation of the corresponding calculation period. The water diversion process and water supply process corresponding to this set of simulation operation data are the optimal scheduling scheme for the calculation period. The water flow rate fluctuation corresponding to the second row and the following rows of each calculation period is greater than the minimum water flow rate fluctuation of the corresponding calculation period.

[0110] It can be seen that scheduling according to the optimal scheduling scheme is to strictly control according to the simulation operation data of the first row of each calculation period, but the actual scheduling process is difficult to be completely consistent with the above data. Therefore, this embodiment formulates a joint scheduling rule containing multiple scheduling schemes based on the sorting results of multiple groups of simulation operation data and combined with actual conditions.

[0111] For example, according to the sorting results in Table 1, and taking the water level of the regulated reservoir as the discriminant parameter, the joint dispatching rules shown in Table 2 can be obtained.

[0112] Table 2 Joint dispatch rules

[0113]

[0114] According to Table 2, the dispatching data corresponding to each row in each dispatching period (i.e., the water level range of the regulating reservoir, water diversion flow, daily water supply flow, and emergency water supply flow) constitute a dispatching plan. In each dispatching period, the water level of the regulating reservoir will inevitably fall within a certain water level range. At this time, the water diversion project and water supply project can be dispatched according to the dispatching plan corresponding to the water level range.

[0115] It is understandable that in actual scheduling, the discrimination parameters and the value range of the discrimination parameters can be flexibly selected according to actual conditions.

[0116] Furthermore, after determining the joint dispatching rules of the water diversion project and the water supply project, the method may further include:

[0117] Carry out simulated dispatching and operation of water diversion projects and water supply projects according to the joint dispatching rules, and adjust the joint dispatching rules when the simulated dispatching and operation results do not meet the preset operation conditions;

[0118] Accordingly, in S3, water diversion projects and water supply projects are dispatched according to the joint dispatching rules, specifically:

[0119] Water diversion projects and water supply projects are dispatched according to the adjusted joint dispatching rules.

[0120] Specifically, this embodiment simulates the dispatching and operation of water diversion projects and water supply projects based on a long series of hydrological data and in accordance with the joint dispatching rules, verifies whether the water inflow and outflow of each reservoir in the water supply project are balanced, evaluates the practicability of the simulated dispatching and operation and the possibility of achieving the goal, and comprehensively evaluates whether the joint dispatching rules are in line with the actual operation of the project based on the verification and evaluation results. If it does not meet the actual operation of the project, it is necessary to adjust the joint dispatching rules to correct the unreasonable operation, and then re-perform the simulated dispatching and operation until it meets the actual operation of the project.

[0121] The following uses the Shaanxi Province Han-Wei River Diversion Project and the Jinjing-Jinpen Cascade Reservoir Group Water Supply Project in the Heihe River Basin of Xi'an as examples to explain in detail the joint dispatching method based on multiple water sources and multiple targets described in the present invention. The implementation flow chart of this example is as follows: Figure 2 shown.

[0122] The Han-Wei Water Diversion Project in this example diverts water to the Guanzhong area of ​​the Weihe River Basin through the Huangjinxia Hydropower Station on the Han River mainstream and the Sanhekou Hydropower Station on the tributary Ziwu River. Since the Han-Wei Water Diversion Project needs to give priority to meeting the water needs of its downstream projects and is limited by the water resources of the Han River, the Han-Wei Water Diversion Process is extremely uneven from year to year. Therefore, the Han-Wei Water Diversion Process needs to be improved before it can fully play its role.

[0123] Jinpen Reservoir is located in the Heihe River Basin of Xi'an City. It is the backbone surface water source of Xi'an City and a large type II water conservancy project. Jinjing Reservoir is located upstream of Jinpen Reservoir. It has the location conditions and water conservancy conditions for interconnection with the Heihe River water supply system and the Han-Wei Diversion System. It can form the Jinjing-Jinpen cascade reservoir group water supply project with Jinpen Reservoir. The characteristic parameters of Jinpen Reservoir and Jinjing Reservoir are shown in Table 3. Using the Han-Wei Diversion Branch Tunnel to connect the Han-Wei Diversion Project and the Jinjing-Jinpen Cascade Reservoir Group Water Supply Project can improve the Han-Wei Diversion Water Diversion Process and achieve multiple water supply goals.

[0124] Table 3 Characteristic parameters of Jinpen Reservoir and Jinjing Reservoir

[0125]

[0126] Furthermore, this example determines the topological relationship of the Jinjing-Jinpen cascade reservoir group based on the location relationship, hydraulic connection, regulation capacity and functional positioning of the Jinpen Reservoir and the Jinjing Reservoir, such as Figure 3 shown.

[0127] Specifically, the location relationship refers to the position relationship and elevation relationship between reservoirs. The Jinjing Reservoir is located upstream of the Jinpen Reservoir. This example determines that the Jinpen Reservoir with a lower elevation uses a pumping station to pump water from the water diverted from the Han-Wei Water Diversion Project into the reservoir, and determines that the Jinjing Reservoir with a higher elevation uses the gravity water of local runoff. This is because the downstream reservoir has a low elevation, a low pumping height, and less electricity consumption, while the upstream reservoir uses gravity water and does not consume electricity. Hydraulic connection refers to the water replenishment relationship between reservoirs. In this example, the upstream Jinjing Reservoir replenishes water to the downstream Jinpen Reservoir. The regulating capacity corresponds to the storage capacity of the reservoir. Reservoirs with large storage capacity have stronger regulating capacity and can bear more external domain targets. Reservoirs with low regulating capacity can bear more local domain targets. In this example, Jinjing Reservoir mainly bears local domain targets, and Jinpen Reservoir mainly bears external domain targets. Functional positioning refers to the functions and roles of reservoirs in water supply projects. Generally, reservoirs with more functions start scheduling and operation quickly, and should bear more emergency targets. Reservoirs with fewer functions start scheduling and operation slowly, and should bear more normal targets. In this example, Jinjing Reservoir bears urban life production water supply targets and agricultural irrigation targets, and Jinpen Reservoir bears drought emergency targets. Jinpen Reservoir also has the function of improving the water diversion process of Han-Wei River. It can be seen from this that Jinpen Reservoir has a regulating effect on both the water diversion process and the water supply process. Jinpen Reservoir should be determined as a regulating reservoir, and its water level can be used as a discriminant parameter for the subsequent determination of the scheduling plan.

[0128] Furthermore, this example classifies the water resources diverted by the Han-Wei Water Diversion Project as external water diversion, and the natural runoff of the Jinjing-Jinpen cascade reservoir group as local runoff according to the area where the water source is located; and according to the way the water resources are introduced, the water volume transferred into the Jinjing-Jinpen cascade reservoir group by the Han-Wei Water Diversion Project is classified as pumped water, and the natural runoff water volume of the Jinjing-Jinpen cascade reservoir group is classified as gravity water.

[0129] At the same time, this example divides the uniform improvement of the water diversion process from the Han River to the Wei River into external domain targets, and divides daily water supply and emergency water supply into local domain targets according to the target corresponding areas; and according to the timing status corresponding to the targets, the uniform improvement of the water diversion process from the Han River to the Wei River and daily water supply are divided into normal targets, and emergency water supply is divided into emergency targets.

[0130] Furthermore, this example establishes objective functions and constraints based on the above-mentioned topological relationships, replenishment and storage relationships, target classification, water source classification, and design parameters of each reservoir. Then, this example simulates the Han-Wei Water Diversion Project based on the long series of hydrological data of the Han-Wei Water Diversion Project using the objective function and constraints, and solves the objective function. For example, this example retrieves a long series of hydrological data totaling 65 years from 1955 to 2020, simulates the Han-Wei Water Diversion Project based on the hydrological data of the first 35 years, and solves the objective function.

[0131] Specifically, this example uses the monthly scale as the calculation period and applies the collaborative particle swarm algorithm to solve the objective function. Specifically, the particle swarm evolution generation is selected as 300, the inertia weight is 0.6, and the two acceleration constants are selected as 1.5 and 2.0. The optimal solution of the function is obtained through iterative calculation and gradual convergence, that is, the minimum water flow variation amplitude and corresponding simulation operation data of each calculation period. At the same time, according to the above iterative calculation process, multiple groups of simulation operation data of each calculation period can be obtained.

[0132] In this example, multiple groups of simulation operation data in each calculation period are sorted according to the magnitude of the water flow rate fluctuation. Then, based on the sorting results and taking the water level of the regulating reservoir (Jinpen Reservoir) as the discrimination parameter, the joint dispatching rules are determined, as shown in Table 4.

[0133] Table 4 Joint dispatching rules for the Jinjing-Jinpen cascade reservoirs and the Han-Wei water diversion project

[0134]

[0135] Furthermore, this example simulates the dispatching operation of the Han-Wei Water Diversion Project and the Jinjing-Jinpen Cascade Reservoir Group Water Supply Project based on a long series of hydrological data and in accordance with the joint dispatching rules to calibrate the joint dispatching rules.

[0136] Specifically, this example simulates the dispatching of the Han-Wei Water Diversion Project and the Jinjing-Jinpen Cascade Reservoir Group Water Supply Project based on the hydrological data of the last 30 years in the above 65-year long series of hydrological data, and conducts a rationality analysis on the simulated dispatching results. The operation processes of the Jinjing Reservoir and the Jinjing Reservoir in the simulated dispatching are as follows: Figure 4 and Figure 5 As shown. Figure 4 It can be seen that the water level variation range of Jinpen Reservoir is basically in the high water level range, indicating that Jinpen Reservoir has a large amount of water storage and is in a long-term emergency guarantee state, which meets the requirements of setting up emergency guarantee storage capacity for long-term reserves to deal with sudden emergencies; and the water level of Jinpen Reservoir in the high water level range also shows a trend of oscillation, indicating the regulating and storage role of Jinpen Reservoir in the Han-Wei Water Diversion Project. Figure 5 It can be seen that since the Jinjing Reservoir is mainly responsible for the relatively stable urban life and production water supply and the agricultural irrigation water supply which varies greatly with the seasons, the water level of the Jinjing Reservoir shows drastic changes between the normal water storage level and the dead water level both annually and intra-annually, indicating that the joint scheduling rules match the water supply target of the Jinjing Reservoir and can meet multiple water supply targets.

[0137] Finally, this example evaluated the improvement effect of the water diversion process, the local water supply efficiency and the comprehensive emergency level based on the simulated dispatching operation results. The details are as follows:

[0138] (1) Evaluation of the improvement effect of the water diversion process. By jointly dispatching the Han-Wei Water Diversion Project and the Jinjing-Jinpen Cascade Reservoir Group Water Supply Project, the water resources in the water diversion area are stored in the Jinpen Reservoir during the flood season, and the stored water resources are discharged in time during the dry season to improve the Han-Wei Water Diversion Process. The comparison chart of the improvement of the water diversion process is shown in the figure below. Figure 6 As shown in the figure, the fluctuation of the water diversion process from Han River to Wei River has been significantly reduced, and the overall process has become more uniform and stable, indicating that the Jinpen Reservoir has a relatively obvious improvement effect on the water diversion process from Han River to Wei River.

[0139] (2) Local water supply efficiency assessment. According to the simulation results, the urban living and production water supply of Jinjing Reservoir is 325 million m 3 The water supply guarantee rate for the period is 95%; the water supply for agricultural irrigation is 80 million m 3 The annual water supply guarantee rate is 50%, which can meet the water needs of local water users.

[0140] (3) Comprehensive emergency level assessment. The comprehensive emergency guarantee in this example mainly considers drought emergency guarantee. Specifically, the 95% frequency water supply capacity of the water source is selected as the existing water source drought emergency condition, which means that the drought emergency storage capacity of the Jinpen Reservoir has the drought emergency guarantee capacity for 95% of the extremely dry years. According to the simulation scheduling operation results, when encountering extreme drought in the water transfer area and the water receiving area, the drought emergency guarantee storage capacity of the Jinjing Reservoir is 0.76 billion m 3 The drought relief emergency guarantee period is 3 months, which can meet the requirements of drought relief emergencies.

[0141] The present invention optimizes the water flow rate of the water diversion project according to the target water diversion flow of the water diversion project and the multiple target water supply flows of the water supply project, as well as the long series of hydrological data of the water diversion project and the water supply project, so as to determine the multiple groups of simulation operation data corresponding to each calculation period of the water diversion project and the water supply project, and then determines the scheduling rules according to the multiple groups of simulation operation data of each calculation period. In this way, multiple water sources and multiple water supply targets can be fully coordinated, and the water diversion process and the water supply process can be matched with multiple water supply targets while ensuring that the water diversion process is uniform and stable, thereby achieving the improvement of the water diversion process and the achievement of multiple water supply targets, which is conducive to giving full play to the effectiveness of the water diversion project and the water supply project and significantly improving the utilization efficiency of water resources. The above are only a few embodiments of the present application, and are not intended to limit the present application in any form. Although the present application is disclosed as above with the preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, makes some changes or modifications using the above disclosed technical content, which are equivalent to equivalent implementation cases and belong to the scope of the technical solution.

Claims

1. A joint scheduling method based on multiple water sources and multiple objectives, characterized in that: The method comprises: S1. Determine a target water diversion flow rate for diverting water from a water diversion project to a water supply project and a plurality of target water supply flows of the water supply project; S2. Constructing a joint dispatching model for optimizing the water transfer flow rate variation of the water transfer project according to the target water transfer flow rate, multiple target water supply flow rates and design parameters of the water supply project, and determining multiple groups of simulation operation data of the water transfer project and the water supply project in each of multiple calculation periods according to a long series of hydrological data of the water transfer project and the water supply project and using the joint dispatching model; S3, determining a joint dispatching rule for the water diversion project and the water supply project according to multiple groups of simulation operation data in each calculation period; and dispatching the water diversion project and the water supply project according to the joint dispatching rule; The joint dispatching model includes an objective function and constraints, wherein the objective function is used to optimize the water flow variation of the water diversion project; In S2, a joint scheduling model is constructed according to the target water transfer flow, multiple target water supply flows and the design parameters of the water supply project, specifically: Establishing the objective function according to the target water transfer flow rate; The constraint conditions are established according to a plurality of target water supply flows and design parameters of the water supply project.

2. The method according to claim 1, characterized in that In S2, based on the long series of hydrological data of the water diversion project and the water supply project, and using the joint scheduling model, multiple groups of simulation operation data of the water diversion project and the water supply project in each of multiple calculation periods are determined, specifically: According to the long series of hydrological data of the water diversion project and the water supply project, and using the objective function and the constraint conditions, a plurality of water diversion flow rate fluctuations of the water diversion project in each of a plurality of calculation periods are determined; According to the multiple water diversion flow rate fluctuations and the objective function, multiple groups of simulation operation data of the water diversion project and the water supply project in each calculation period in multiple calculation periods are determined; the multiple groups of simulation operation data correspond one-to-one to the multiple water diversion flow rate fluctuations.

3. The method according to claim 2, characterized in that In S3, the joint dispatching rules of the water diversion project and the water supply project are determined according to the multiple groups of simulation operation data in each calculation period, specifically: According to the magnitudes of the multiple water diversion flow rate fluctuations corresponding to the multiple sets of simulation operation data in each calculation period, the multiple sets of simulation operation data in each calculation period are sorted, and the joint scheduling rules of the water diversion project and the water supply project are determined according to the sorting results.

4. The method according to claim 1, characterized in that: The S1 is specifically: Determine multiple target water supply flows of the water supply project according to multiple water demands of the water use area, wherein the multiple water demands correspond to the multiple target water supply flows one by one; The target water diversion flow rate of the water diversion project to the water supply project is determined according to the natural runoff of the water supply project and multiple target water supply flow rates.

5. The method according to claim 1, characterized in that The water supply project is a reservoir group.

6. The method according to claim 5, characterized in that The reservoir group is a cascade reservoir group.

7. The method according to claim 1, characterized in that Multiple target water supply flows include daily water supply target flow and emergency water supply target flow.

8. The method according to claim 1, characterized in that After determining the joint dispatching rules of the water diversion project and the water supply project, the method further includes: Performing simulated scheduling operation on the water diversion project and the water supply project according to the joint scheduling rule, and adjusting the joint scheduling rule when the simulated scheduling operation result does not meet the preset operation conditions; Accordingly, in S3, the water diversion project and the water supply project are scheduled according to the joint scheduling rule, specifically: The water diversion project and the water supply project are dispatched according to the adjusted joint dispatching rules.

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