A method for raising the operating water level of an existing hydropower station based on stage design flood

Abstract

The application provides a built hydropower station operation water level lifting method based on staged design flood, comprising: analyzing flood seasonal variation law of a target hydropower station reservoir, carrying out flood staging on the target hydropower station reservoir flood, and proposing design flood and design flood hydrograph of different periods; constructing a hydropower station reservoir area water surface line calculation model, combining the design flood of the target hydropower station reservoir to calculate the reservoir water surface line under each starting push water level of different periods; constructing a hydropower station flood regulation model, combining the design flood hydrograph of the target hydropower station reservoir to calculate the reservoir highest flood regulation water level under each starting regulation water level of different periods; based on the reservoir water surface line and the highest flood regulation water level, combing the water level lifting opportunity, the water level lifting scheme is drafted. Through the application, the problem that the existing related technology cannot fully tap the comprehensive benefits of the project is solved.

Description

Technical Field

[0001] This invention relates to the field of hydropower station engineering design technology, and in particular to a method for raising the operating water level of an existing hydropower station based on phased design floods. Background Technology

[0002] For existing hydropower stations, maximizing the comprehensive benefits of the project while ensuring flood control safety is a crucial aspect of researching operational scheduling methods. Flood control safety primarily includes the inundation safety of key controlled objects within the reservoir area, the flood control operation safety of the hydropower station itself, and the flood control safety of downstream protected objects. This involves calculating the reservoir water level, flood regulation calculations, and simulating flood control scheduling methods. Comprehensive benefits mainly include the power generation benefits and dry season water replenishment benefits of the hydropower station. Given a fixed flood control limit, raising the normal storage level and operating at a high flood control level will benefit the power generation and dry season water replenishment benefits, as well as the flood control safety of downstream protected objects. However, it will adversely affect the flood control safety of controlled objects within the reservoir area and the hydropower station itself. Therefore, determining the operational control water level for existing hydropower stations at various times of the year to ensure flood control safety and maximize the comprehensive benefits of the project is of paramount importance.

[0003] Previous research on the scheduling schemes of existing hydropower stations has primarily focused on characteristic water levels (flood control level, normal storage level, flood control high level, dead water level, etc.) determined during the design phase as boundary conditions. These studies consider the flood control safety of downstream protected areas and examine the scheduling and operation modes of hydropower stations during the flood season, storage period, drawdown period, and dry season. However, with the rapid development of the economy and society and the establishment of national strategies such as the construction of new power systems, there is an urgent need to vigorously develop clean energy and provide stable and flexible power sources for the power system. Therefore, based on the current status of existing hydropower station projects and their scheduling operations, it is essential to study methods for raising the operating water level of hydropower stations.

[0004] There is currently no effective solution to the problem that existing technologies cannot fully realize the comprehensive benefits of engineering projects. Summary of the Invention

[0005] This invention provides a method for raising the operating water level of an existing hydropower station based on phased design floods, in order to compensate for the shortcomings of existing related technologies that cannot fully tap the comprehensive benefits of the project.

[0006] In a first aspect, the present invention provides a method for raising the operating water level of an existing hydropower station based on phased design floods, comprising: The seasonal variation pattern of floods in the target hydropower station reservoir is analyzed, and the floods in the target hydropower station reservoir are divided into flood periods. The design floods and their design flood process lines for different periods are proposed. Construct a calculation model of the water surface line in the reservoir area of ​​a hydropower station, and calculate the water surface line of the reservoir at different periods and at each initial water level based on the design flood of the target hydropower station reservoir. Construct a flood regulation model for a hydropower station, and calculate the highest regulating flood level of the reservoir at different times under each starting water level, based on the design flood hydrograph of the target hydropower station reservoir. Based on the reservoir water level and the highest flood control level, the limiting factors for the water level rise of the target hydropower station are identified, and a water level rise plan is proposed in combination with the timing of water level rise during the main flood season and the post-flood season. A runoff regulation model for hydropower stations is constructed to determine the hydropower indicators of hydropower stations under each of the aforementioned water level rise schemes, and the comprehensive benefits after water level rise are analyzed. The economic indicators for each of the aforementioned water level raising schemes are determined, and an economic comparative analysis is conducted to determine the final recommended water level raising scheme.

[0007] According to the present invention, a method for raising the operating water level of an existing hydropower station based on phased design floods is provided. This method analyzes the seasonal variation pattern of floods in the target hydropower station reservoir, divides the floods in the target hydropower station reservoir into phases, and proposes the design floods and their hydrographs for different periods, including: Analyze the natural geography, watershed climate, and runoff-rainfall characteristics of the target watershed to determine the seasonal variation patterns of rainstorms and floods in the target watershed; Based on the seasonal variation patterns of rainstorms and floods in the target watershed, a phased study of reservoir floods at hydropower stations is conducted. The flood season of the target watershed is divided into the main flood season and the post-flood season, and the design floods and their process curves for the main flood season and the post-flood season are proposed.

[0008] According to the present invention, a method for raising the operating water level of an existing hydropower station based on phased design floods is provided. This method constructs a water surface line calculation model for the hydropower station reservoir area and calculates the reservoir water surface line at different initial water levels during different periods, in conjunction with the design flood of the target hydropower station reservoir. The method includes: Using the peak flood flow during the main flood season and the post-flood season as the control, the reservoir water surface line at each frequency and starting water level during the main flood season and the post-flood season is calculated respectively. Using the multi-year average flow rate at the dam site of the hydropower station as input, the reservoir water surface line under the multi-year average operating conditions is calculated.

[0009] According to the present invention, a method for raising the operating water level of an existing hydropower station based on phased design floods is provided, which calculates the reservoir water surface line, including: Determine the correlation between reservoir section water level and river flow; Based on the aforementioned correlation, a trial-and-error algorithm is used to iteratively solve the problem until the accuracy requirements are met, thereby determining the water surface line of the reservoir.

[0010] According to the present invention, a method for raising the operating water level of an existing hydropower station based on phased design floods is provided. A flood regulation model for the hydropower station is constructed, and the highest regulating flood level of the reservoir at different periods is calculated using the design flood hydrograph of the target hydropower station reservoir. The method includes iteratively executing the following steps until the accuracy requirements are met: Obtain the inflow rate at the beginning and end of the time period, as well as the outflow rate and water level at the beginning of the time period; Query the reservoir water level and storage capacity curve to obtain the storage capacity at the beginning of the time period; Assume the outflow at the end of the time period and query the water level and storage capacity curve to obtain the corresponding reservoir water level; The calculated outflow rate at the end of the time period is obtained by combining the reservoir water level obtained from the query with the discharge capacity curve. The deviation between the calculated outflow rate and the set outflow rate is compared until the deviation is within the preset range. The above iterative calculations are performed for each time period to obtain the highest flood level of the reservoir; among them, the highest flood level at the design frequency is the design flood level, and the highest flood level at the check frequency is the check flood level.

[0011] According to the present invention, a method for raising the operating water level of an existing hydropower station based on phased design floods is provided. This method identifies the constraints on water level rise at the target hydropower station based on the reservoir water surface level and the highest regulating flood level, and formulates water level rise schemes for different periods, including: Based on the reservoir water surface lines at various frequencies and starting water levels during the main flood season and the post-flood season, the impact of water level rise on the inundation control objects in the reservoir area is analyzed. The impact of water level rise on dam operation safety is analyzed based on the highest flood level. Based on the reservoir water surface line under multi-year average operating conditions, the impact of water level rise on the backwater effect of upstream hydropower station is analyzed. Taking into account the impact of rising water levels, a water level raising plan is proposed.

[0012] According to the present invention, a method for raising the operating water level of an existing hydropower station based on phased design floods is provided. This method constructs a runoff regulation model for the hydropower station, determines the hydropower indicators of the hydropower station under various water level raising schemes, and analyzes the comprehensive benefits after the water level is raised. The method includes: Considering the flood control safety of the downstream flood protection objects of the project, based on the water level rise scheme, the highest operating water level of the hydropower station in each period is determined, and the scheduling and operation mode is proposed. Using the highest operating water level as the boundary condition, a runoff regulation model for the hydropower station is constructed to determine the hydropower indicators of the hydropower station and analyze the comprehensive benefits of the hydropower station under each of the water level raising schemes.

[0013] According to the present invention, a method for raising the operating water level of an existing hydropower station based on phased design floods is provided, which determines the economic indicators under various water level raising schemes, conducts economic comparative analysis, and determines the final recommended water level raising scheme, including: Based on the static total investment and historical average power generation of each of the aforementioned water level rise schemes, economic indicators are calculated and economic comparative analysis is conducted; the economic indicators include investment per unit of electricity and supplementary investment per unit of electricity. The overall benefits of operating the water level raising scheme are analyzed from the perspectives of increased power generation and water replenishment benefits during the dry season. Taking into account the connection of cascade water levels, reservoir inundation, flood control safety of the project, economic efficiency and comprehensive benefits of water level raising, a recommended water level raising scheme is determined.

[0014] Secondly, the present invention also provides a device for raising the operating water level of an existing hydropower station, comprising: The segmentation module is used to analyze the seasonal variation pattern of floods in the target hydropower station reservoir, divide the floods of the target hydropower station reservoir into flood stages, and propose the design floods and their design flood process lines for different periods; The processing module is used to construct a water surface line calculation model for the reservoir area of ​​a hydropower station, and to calculate the water surface line of the reservoir at different times and under different initial water levels in conjunction with the design flood of the target hydropower station reservoir. The calculation module is used to construct a flood regulation model for a hydropower station and calculate the highest regulating flood level of the reservoir at different times under each starting water level, based on the design flood process line of the target hydropower station reservoir. The formulation module is used to identify the factors restricting the water level rise of the target hydropower station based on the reservoir water surface line and the highest flood control level, and to formulate water level rise schemes for different periods. The analysis module is used to construct a runoff regulation model for hydropower stations, determine the hydropower indicators of hydropower stations under each of the aforementioned water level rise schemes, and analyze the comprehensive benefits after the water level rise. The decision-making module is used to determine the economic indicators under each of the water level raising schemes, conduct economic comparative analysis, and determine the final recommended water level raising scheme.

[0015] Thirdly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for raising the operating water level of an existing hydropower station based on phased design floods as described in the first aspect above.

[0016] Fourthly, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for raising the operating water level of an existing hydropower station based on phased design floods as described in the first aspect above.

[0017] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the method for raising the operating water level of an existing hydropower station based on phased design floods as described in the first aspect above.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a method for raising the operating water level of existing hydropower stations based on phased design floods. It identifies the constraints on raising the operating water level of hydropower stations from aspects such as reservoir inundation, cascade connection, and flood control safety, quantifies the water level rise of existing hydropower stations, and provides technical support for formulating water level raising schemes. Based on flood phased research, it proposes a scheduling and operation mode under the background of rising operating water levels, rationally determining the timing and magnitude of water storage and drawdown at hydropower stations. This provides a complete solution for raising the water level of existing hydropower stations and improving the overall project benefits, overcoming the problem that existing related technologies cannot fully tap into the comprehensive benefits of the project. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a flowchart of the method for raising the operating water level of an existing hydropower station based on phased design floods provided by the present invention; Figure 2 This is a structural block diagram of the water level raising device for an existing hydropower station provided by the present invention; Figure 3 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] This invention provides a method for raising the operating water level of an existing hydropower station based on phased design floods. Figure 1 This is a flowchart of the method for raising the operating water level of an existing hydropower station based on phased design floods, provided by the present invention. Figure 1As shown, the method includes the following steps: Step S101: Analyze the seasonal variation pattern of floods in the target hydropower station reservoir, divide the floods in the target hydropower station reservoir into flood stages, and propose the design floods and their design flood process lines for different periods; Step S102: Construct a water surface line calculation model for the reservoir area of ​​the hydropower station, and calculate the water surface line of the reservoir at different times and starting water levels in combination with the design flood of the target hydropower station reservoir. Step S103: Construct a flood regulation model for the hydropower station, and calculate the highest regulating flood level of the reservoir at different times under each starting water level, based on the design flood process line of the target hydropower station reservoir. Step S104: Based on the reservoir water level and the highest flood control level, identify the factors restricting the rise of the target hydropower station's water level, and formulate a water level rise plan in combination with the timing of water level rise in different periods. Step S105: Construct a runoff regulation model for the hydropower station, determine the hydropower indicators of the hydropower station under various water level rise schemes, and analyze the comprehensive benefits after the water level rise. Step S106: Determine the economic indicators under each water level raising scheme, conduct an economic comparative analysis, and determine the final recommended water level raising scheme.

[0023] This method first analyzes the environmental characteristics of the target watershed, scientifically divides the flood season, and proposes phased design floods and design flood hydrographs. Then, it constructs a water surface line calculation model for the hydropower station reservoir, determines the reservoir water surface line at different times, and quantitatively analyzes the impact of rising operating water levels on the inundation of important controlled objects in the reservoir area, as well as the impact on the backwater effect of the upstream hydropower station. Next, it constructs a flood regulation model for the hydropower station, calculates the highest regulating flood level at each starting water level during different periods based on the design flood hydrograph of the target hydropower station reservoir, and quantitatively analyzes the impact of rising operating water levels on the flood control safety of the project's key structures. Then, based on the reservoir water surface line and the highest regulating flood level, it identifies the constraints on water level rise at the target hydropower station, and proposes water level rise schemes based on the timing of water level rises at different times. Next, it constructs a runoff regulation model for the hydropower station, determines the hydropower indicators of the hydropower station under each water level rise scheme, and analyzes the comprehensive benefits after water level rise. Finally, it determines the economic indicators under each water level rise scheme, conducts an economic comparative analysis, and determines the final recommended water level rise scheme. Through the above process, the constraints on the rise of water level in hydropower stations were identified from aspects such as reservoir inundation, cascade connection, and flood control safety of the project. The magnitude of water level rise in existing hydropower stations was quantified. Based on the study of flood stages, a scheduling and operation mode for hydropower stations under the background of rising water level was proposed. The timing and magnitude of water storage and drawdown of hydropower stations were reasonably determined. A complete solution was provided for realizing the rise of water level in existing hydropower stations and improving the comprehensive benefits of the project, which made up for the problem that existing related technologies cannot fully tap the comprehensive benefits of the project.

[0024] In some embodiments, step S101 involves analyzing the seasonal variation pattern of floods in the target hydropower station reservoir, dividing the floods in the target hydropower station reservoir into flood stages, and proposing design floods and their design flood process lines for different periods. This includes: analyzing the natural geography, basin climate, and runoff-rainfall characteristics of the target watershed to determine the seasonal variation pattern of rainstorm floods in the target watershed; conducting a phased study of the floods in the hydropower station reservoir based on the seasonal variation pattern of rainstorm floods in the target watershed, dividing the flood season of the target watershed into the main flood season and the post-flood season, and proposing the design floods and their design flood process lines for the main flood season and the post-flood season.

[0025] Based on this, in step S102, a water surface line calculation model for the reservoir area of ​​the hydropower station is constructed. The water surface line of the reservoir at different periods is calculated in conjunction with the design flood of the target hydropower station reservoir. This includes: using the peak flood flow of the main flood season and the post-flood season as control, calculating the water surface line of the reservoir at each frequency and each starting water level during the main flood season and the post-flood season respectively; and using the multi-year average flow at the hydropower station dam site as input, calculating the water surface line of the reservoir under the multi-year average operating conditions.

[0026] Specifically, calculating the reservoir water surface line includes: determining the correlation between the water level at the reservoir section and the flow rate of the river section; and using a trial-and-error algorithm to iteratively solve the problem based on the correlation until the accuracy requirements are met, thereby determining the reservoir water surface line.

[0027] For example, in engineering design, the piecewise summation method is often used to calculate the water surface line of the reservoir area. The basic equation is as follows:

[0028] in, Indicates the water level at the downstream section. Indicates the water level at the upstream section; This represents the kinetic energy correction factor. This represents the local head loss coefficient. Indicates the flow rate of the river section. Represents gravitational acceleration. Indicates the downstream cross-sectional area. Indicates the upstream cross-sectional area. Indicates the roughness of the river section. Indicates the hydraulic radius of the downstream section. Indicates the hydraulic radius of the upstream section. Indicates the cross-sectional spacing.

[0029] The above equations are solved using a trial-and-error method: the initial cross-section is known. , , , Assuming the water level at the upstream section Calculate its cross-sectional area and hydraulic radius Calculate the water level at the upstream section. ,Compare and If the water level deviation is within the allowable range, If the desired result is achieved, then iterate again until the accuracy requirement is met; otherwise, repeat the process until the accuracy requirement is met.

[0030] In some embodiments, step S103 involves constructing a flood regulation model for a hydropower station and calculating the highest regulating flood level of the reservoir at different times based on the design flood process curve of the target hydropower station reservoir. This includes iteratively executing the following steps until the accuracy requirements are met: obtaining the inflow at the beginning and end of the time period, as well as the outflow and reservoir level at the beginning of the time period; querying the reservoir level-capacity curve to obtain the reservoir capacity at the beginning of the time period; assuming the outflow at the end of the time period and querying the level-capacity curve to obtain the corresponding reservoir level; combining the obtained reservoir level with the discharge capacity curve to obtain the calculated outflow at the end of the time period, comparing the deviation between the calculated outflow and the set outflow until the deviation is within a preset range; performing the above iterative calculations for each time period to obtain the highest regulating flood level of the reservoir; wherein, the highest regulating flood level at the design frequency is the design flood level, and the highest regulating flood level at the check frequency is the check flood level.

[0031] For example, based on the designed flood control rules, a flood regulation model for the hydropower station is constructed to calculate the design flood level and check flood level under various operating water level rise schemes, and to quantitatively analyze the impact of operating water level rise on the flood control safety of the project. Taking into account factors such as cascade water level connection, reservoir inundation, and project flood control safety, operating water level rise schemes for the main flood season and the post-flood season are proposed.

[0032] In engineering design, the static storage capacity method is often used to calculate reservoir flood regulation. This involves replacing the continuity equations in the Saint-Venant equations with the water balance equations and replacing the dynamic equations with the discharge capacity curves. The specific formulas are as follows:

[0033] q

[0034] Based on the above principles, the following steps are taken to perform reservoir flood regulation calculations: 1. Given the inflow rates at the beginning and end of the time period. , Outbound flow at the beginning of the period The initial reservoir water level .

[0035] 2. Query the reservoir water level and storage capacity curve to obtain the storage capacity at the beginning of the time period. .

[0036] 3. Assume outbound flow at the end of the time period Seeking And obtain the water level and reservoir capacity curve. .

[0037] 4. By The calculated outflow rate at the end of the time period can be obtained by querying the discharge capacity curve. ,Compare and Deviation, if the flow deviation is within the allowable range, If the desired result is achieved, then iterate again until the accuracy requirement is met; otherwise, repeat the process until the accuracy requirement is met.

[0038] 7. Based on this, in step S104, the limiting factors of water level rise of the target hydropower station are identified based on the reservoir water surface line and the highest flood control level, and water level rise schemes for different periods are formulated, including: analyzing the impact of water level rise on the reservoir inundation control objects based on the reservoir water surface line at each frequency and starting water level during the main flood season and the post-flood season; analyzing the impact of water level rise on the dam operation safety based on the highest flood control level; analyzing the backwater effect of water level rise on the upstream hydropower station based on the reservoir water surface line under the multi-year average operating conditions; and comprehensively considering the impact of water level rise, water level rise schemes for different periods are formulated.

[0039] In some embodiments, step S105 involves constructing a hydropower station runoff regulation model, determining the hydropower station's hydropower indicators under various water level rise schemes, and analyzing the comprehensive benefits after water level rise. This includes: considering the flood control safety of downstream flood protection objects, determining the highest operating water level of the hydropower station for each period based on the water level rise scheme, and proposing a scheduling and operation mode; using the highest operating water level as a boundary condition, constructing a hydropower station runoff regulation model, calculating the hydropower station's hydropower indicators, and analyzing the comprehensive benefits of the hydropower station under various water level rise schemes.

[0040] For example, based on the proposed water level rise scheme and considering the flood control safety of downstream flood protection objects, the highest operating water level of the hydropower station is determined on a ten-day or monthly basis for the flood season, water storage period, drawdown period, and dry season. The scheduling and operation mode is proposed. Using this as the boundary condition, a hydropower station runoff regulation model is constructed, and long-term regulation calculations are carried out to calculate the hydropower station's multi-year average power generation, guaranteed output, and other hydropower indicators. The comprehensive benefits of the power station under each water level rise scheme are analyzed.

[0041] In engineering design, the equal output method is often used for long-term regulation calculations. This method assumes the reservoir water level is at a dead water level, starting from the end of the water supply period, and that the equal output is... The calculation of "water supply determined by electricity" is carried out in reverse chronological order for each time period until the initial reservoir water level at the beginning of the water supply period is calculated. .like If the deviation from the normal water level is within the allowable range, the long-term regulation calculation is completed, and the statistical calculation results can be used to obtain hydropower indicators such as the power station's multi-year average power generation and guaranteed output. If the water level is higher than the normal storage level, then increase Recalculate; If the water level is below the normal storage level, then reduce... Recalculate.

[0042] Based on the above embodiments, step S106 involves determining the economic indicators for each water level raising scheme, conducting an economic comparative analysis, and determining the final recommended water level raising scheme. This includes: calculating economic indicators and conducting an economic comparative analysis based on the total static investment and historical average power generation of each water level raising scheme; the economic indicators include investment per unit of electricity and investment per unit of supplementary electricity; analyzing the comprehensive benefits of the operating water level raising scheme from the perspectives of increased power generation and dry season water replenishment benefits; and determining the recommended water level raising scheme by considering the connection of cascade water levels, reservoir inundation, flood control safety of the project, the economy of water level raising, and comprehensive benefits.

[0043] In summary, this method takes the inundation safety of important control objects in the reservoir area, the flood control operation safety of the hub itself, and the flood control safety of downstream flood protection objects as the underlying conditions. Based on the phased design flood results, it studies and proposes a method for raising the operating water level of the hydropower station, rationally determines the timing and magnitude of water storage and drawdown of the hydropower station, and explores the comprehensive benefits of the project.

[0044] The present invention also provides a device for raising the operating water level of an existing hydropower station. The device for raising the operating water level of an existing hydropower station provided by the present invention will be described below. The device for raising the operating water level of an existing hydropower station described below can be referred to in correspondence with the method for raising the operating water level of an existing hydropower station described above. Figure 2 This is a structural block diagram of the water level raising device for an existing hydropower station provided by the present invention, as shown in the figure. Figure 2 As shown, the device includes: Module 201 is used to analyze the seasonal variation of floods in the target hydropower station reservoir, divide the floods in the target hydropower station reservoir into flood periods, and propose the design floods and their process curves for different periods; Processing module 202 is used to construct a water surface line calculation model for the reservoir area of ​​a hydropower station, and to calculate the water surface line of the reservoir at different times and under different initial water levels in conjunction with the design flood of the target hydropower station reservoir. The calculation module 203 is used to construct a flood regulation model for a hydropower station and calculate the highest regulating flood level of the reservoir at different times under each starting water level, in conjunction with the design flood process line of the target hydropower station reservoir. Module 204 is used to identify the limiting factors for water level rise at the target hydropower station based on the reservoir water surface line and the highest flood control level, and to formulate water level rise schemes for different periods. Analysis module 205 is used to construct a runoff regulation model for hydropower stations, determine the hydropower indicators of hydropower stations under various water level rise schemes, and analyze the comprehensive benefits after water level rise. Decision module 206 is used to determine the economic indicators under each water level raising scheme, conduct economic comparative analysis, and determine the final recommended water level raising scheme.

[0045] When this device is in use, firstly, module 201 analyzes the environmental characteristics of the target watershed, scientifically divides the flood season of the target watershed, and proposes phased design floods and design flood hydrographs. Then, module 202 constructs a water surface line calculation model for the hydropower station reservoir area, determines the reservoir water surface line at different times, and quantitatively analyzes the impact of the rising operating water level on the inundation of important controlled objects in the reservoir area, as well as the impact on the tailrace backwater of the upstream hydropower station. Calculation module 203 then constructs a flood regulation model for the hydropower station, calculates the highest regulating flood level of the reservoir at different times based on the design flood hydrograph of the target hydropower station reservoir, and quantitatively analyzes the impact of the rising operating water level on the flood control safety of the project's key structures. Next, module 204, based on the reservoir water surface line and the highest regulating flood level, identifies the constraints on the water level rise of the target hydropower station and formulates water level rise schemes for different times. Analysis module 205 then constructs a runoff regulation model for the hydropower station, determines the hydropower indicators of the hydropower station under each water level rise scheme, and analyzes the comprehensive benefits after the water level rise. Finally, decision module 206 determines the economic indicators under each water level rise scheme, conducts economic comparative analysis, and determines the final recommended water level rise scheme. Through the above process, the constraints on the water level rise of hydropower stations were identified from aspects such as reservoir inundation, cascade connection, and flood control safety of the project, and the water level rise range of existing hydropower stations was quantified. Based on the study of flood stages, a scheduling and operation mode under the background of water level rise of hydropower stations was proposed, and the timing and magnitude of water storage and drawdown of hydropower stations were reasonably determined. This provides a complete solution for realizing the water level rise of existing hydropower stations and improving the comprehensive benefits of the project, and makes up for the problem that existing related technologies cannot fully explore the comprehensive benefits of the project.

[0046] Figure 3 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 3 As shown, the electronic device may include: a processor 301, a communication interface 302, a memory 303, and a communication bus 304. The processor 301, communication interface 302, and memory 303 communicate with each other via the communication bus 304. The processor 301 can call logical instructions from the memory 303 to execute a method for raising the operating water level of an existing hydropower station based on phased design floods. This method includes: The seasonal variation pattern of floods in the target hydropower station reservoir is analyzed, the floods in the target hydropower station reservoir are divided into flood periods, and the design floods and their design flood process lines for different periods are proposed. Construct a calculation model of the water surface line in the reservoir area of ​​a hydropower station, and calculate the water surface line of the reservoir at different times and at different initial water levels by combining the design flood of the target hydropower station reservoir. Construct a flood regulation model for a hydropower station, and calculate the highest regulating flood level of the reservoir at different times under each starting water level, based on the design flood hydrograph of the target hydropower station reservoir. Based on the reservoir water level and the highest flood control level, the limiting factors for the water level rise of the target hydropower station were identified, and a water level rise plan was proposed. Construct a runoff regulation model for a hydropower station, determine the hydropower indicators of the hydropower station under various water level rise schemes, and analyze the comprehensive benefits after the water level rise. Determine the economic indicators for each water level rise scheme, conduct economic comparative analysis, and determine the final recommended water level rise scheme.

[0047] Furthermore, the logical instructions in the aforementioned memory 303 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0048] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the above-described methods for raising the operating water level of an existing hydropower station based on phased design floods. The method includes: The seasonal variation pattern of floods in the target hydropower station reservoir is analyzed, the floods in the target hydropower station reservoir are divided into flood periods, and the design floods and their design flood process lines for different periods are proposed. Construct a calculation model of the water surface line in the reservoir area of ​​a hydropower station, and calculate the water surface line of the reservoir at different times and at different initial water levels by combining the design flood of the target hydropower station reservoir. Construct a flood regulation model for a hydropower station, and calculate the highest regulating flood level of the reservoir at different times under each starting water level, based on the design flood hydrograph of the target hydropower station reservoir. Based on the reservoir water level and the highest flood control level, the limiting factors for the water level rise of the target hydropower station were identified, and water level rise plans for different periods were proposed. Construct a runoff regulation model for a hydropower station, determine the hydropower indicators of the hydropower station under various water level rise schemes, and analyze the comprehensive benefits after the water level rise. Determine the economic indicators for each water level rise scheme, conduct economic comparative analysis, and determine the final recommended water level rise scheme.

[0049] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for raising the operating water level of an existing hydropower station based on phased design floods, as provided by the methods described above, the method comprising: The seasonal variation pattern of floods in the target hydropower station reservoir is analyzed, the floods in the target hydropower station reservoir are divided into flood periods, and the design floods and their design flood process lines for different periods are proposed. Construct a calculation model of the water surface line in the reservoir area of ​​a hydropower station, and calculate the water surface line of the reservoir at different times and at different initial water levels by combining the design flood of the target hydropower station reservoir. Construct a flood regulation model for a hydropower station, and calculate the highest regulating flood level of the reservoir at different times under each starting water level, based on the design flood hydrograph of the target hydropower station reservoir. Based on the reservoir water level and the highest flood control level, the limiting factors for the water level rise of the target hydropower station were identified, and a water level rise plan was proposed. Construct a runoff regulation model for a hydropower station, determine the hydropower indicators of the hydropower station under various water level rise schemes, and analyze the comprehensive benefits after the water level rise. Determine the economic indicators for each water level rise scheme, conduct economic comparative analysis, and determine the final recommended water level rise scheme.

[0050] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0051] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for raising the operating water level of an existing hydropower station based on phased design floods, characterized in that, include: The seasonal variation pattern of floods in the target hydropower station reservoir is analyzed, and the floods in the target hydropower station reservoir are divided into flood periods. The design floods and their design flood process lines for different periods are proposed. Construct a calculation model of the water surface line in the reservoir area of ​​a hydropower station, and calculate the water surface line of the reservoir at different periods and at each initial water level based on the design flood of the target hydropower station reservoir. Construct a flood regulation model for a hydropower station, and calculate the highest regulating flood level of the reservoir at different times under each starting water level, based on the design flood hydrograph of the target hydropower station reservoir. Based on the reservoir water level and the highest flood control level, the limiting factors for the water level rise of the target hydropower station are identified, and a water level rise plan is proposed. A runoff regulation model for hydropower stations is constructed to determine the hydropower indicators of hydropower stations under each of the aforementioned water level rise schemes, and the comprehensive benefits after water level rise are analyzed. The economic indicators for each of the aforementioned water level raising schemes are determined, and an economic comparative analysis is conducted to determine the final recommended water level raising scheme.

2. The method for raising the operating water level of an existing hydropower station based on phased design floods according to claim 1, characterized in that, Analyze the seasonal variation patterns of floods in the target hydropower station reservoir, divide the floods of the target hydropower station reservoir into flood stages, and propose the design floods and their design flood hydrographs for different periods, including: Analyze the natural geography, watershed climate, and runoff-rainfall characteristics of the target watershed to determine the seasonal variation patterns of rainstorms and floods in the target watershed; Based on the seasonal variation patterns of rainstorms and floods in the target watershed, a phased study of reservoir floods at hydropower stations is conducted. The flood season of the target watershed is divided into the main flood season and the post-flood season, and the design floods and their process curves for the main flood season and the post-flood season are proposed.

3. The method for raising the operating water level of an existing hydropower station based on phased design floods according to claim 2, characterized in that, A calculation model for the water surface line of the hydropower station reservoir area is constructed. Based on the design flood of the target hydropower station reservoir, the water surface line of the reservoir at different periods and various initial water levels is calculated, including: Using the peak flood flow during the main flood season and the post-flood season as the control, the reservoir water surface line at each frequency and starting water level during the main flood season and the post-flood season is calculated respectively. Using the multi-year average flow rate at the dam site of the hydropower station as input, the reservoir water surface line under the multi-year average operating conditions is calculated.

4. The method for raising the operating water level of an existing hydropower station based on phased design floods according to claim 3, characterized in that, Calculating the water surface line of the reservoir includes: Determine the correlation between reservoir section water level and river flow; Based on the aforementioned correlation, a trial-and-error algorithm is used to iteratively solve the problem until the accuracy requirements are met, thereby determining the water surface line of the reservoir.

5. The method for raising the operating water level of an existing hydropower station based on phased design floods according to claim 1, characterized in that, Construct a flood regulation model for the hydropower station, and calculate the highest regulating flood level of the reservoir at different times under various regulating water levels, based on the design flood hydrograph of the target hydropower station reservoir. This includes iteratively executing the following steps until the accuracy requirements are met: Obtain the inflow rate at the beginning and end of the time period, as well as the outflow rate and water level at the beginning of the time period; Query the reservoir water level and storage capacity curve to obtain the storage capacity at the beginning of the time period; Assume the outflow at the end of the time period and query the water level and storage capacity curve to obtain the corresponding reservoir water level; The calculated outflow rate at the end of the time period is obtained by combining the reservoir water level obtained from the query with the discharge capacity curve. The deviation between the calculated outflow rate and the set outflow rate is compared until the deviation is within the preset range. The above iterative calculations are performed for each time period to obtain the highest flood level of the reservoir; among them, the highest flood level at the design frequency is the design flood level, and the highest flood level at the check frequency is the check flood level.

6. The method for raising the operating water level of an existing hydropower station based on phased design floods according to claim 3, characterized in that, Based on the reservoir water level and the highest flood control level, the limiting factors for water level rise at the target hydropower station, the timing of water level rise during the main flood season and the post-flood season, and a water level rise plan is proposed, including: Based on the reservoir water surface lines at various frequencies and starting water levels during the main flood season and the post-flood season, the impact of water level rise on the inundation control objects in the reservoir area is analyzed. The impact of water level rise on dam operation safety is analyzed based on the design flood level and the check flood level. Based on the reservoir water surface line under multi-year average operating conditions, the impact of water level rise on the backwater effect of upstream hydropower station is analyzed. Taking into account the constraints on water level rise and the timing of water level rise during the main flood season and the post-flood season, a water level rise plan is proposed.

7. The method for raising the operating water level of an existing hydropower station based on phased design floods according to claim 1, characterized in that, A runoff regulation model for a hydropower station is constructed to determine the hydropower indicators of the hydropower station under each of the aforementioned water level rise schemes, and the comprehensive benefits after the water level rise are analyzed, including: Considering the flood control safety of the downstream flood protection objects of the project, based on the water level rise scheme, the highest operating water level of the hydropower station in each period is determined, and the scheduling and operation mode is proposed. Using the highest operating water level as the boundary condition, a runoff regulation model for the hydropower station is constructed to determine the hydropower indicators of the hydropower station and analyze the comprehensive benefits of the hydropower station under each of the water level raising schemes.

8. The method for raising the operating water level of an existing hydropower station based on phased design floods according to claim 1, characterized in that, Determine the economic indicators for each of the aforementioned water level raising schemes, conduct an economic comparative analysis, and determine the final recommended water level raising scheme, including: Based on the static total investment of the project and the average annual power generation of the power station under each of the aforementioned water level rise schemes, economic indicators are calculated and economic comparative analysis is conducted; the economic indicators include investment per unit of electricity and supplementary investment per unit of electricity. The overall benefits of operating the water level raising scheme are analyzed from the perspectives of increased power generation and water replenishment benefits during the dry season. Taking into account the connection of cascade water levels, reservoir inundation, flood control safety of the project, economic efficiency and comprehensive benefits of water level raising, a recommended water level raising scheme is determined.

9. A device for raising the operating water level of an existing hydropower station, used to implement the method for raising the operating water level of an existing hydropower station based on phased design floods as described in any one of claims 1-8, characterized in that, include: The segmentation module is used to analyze the seasonal variation pattern of floods in the target hydropower station reservoir, divide the floods of the target hydropower station reservoir into flood stages, and propose the design floods and their design flood process lines for different periods; The processing module is used to construct a water surface line calculation model for the reservoir area of ​​a hydropower station, and to calculate the water surface line of the reservoir at different times and under different initial water levels in conjunction with the design flood of the target hydropower station reservoir. The calculation module is used to construct a flood regulation model for a hydropower station and calculate the highest regulating flood level of the reservoir at different times under each starting water level, based on the design flood process line of the target hydropower station reservoir. The formulation module is used to analyze the limiting factors of water level rise of the target hydropower station and the timing of water level rise during the main flood season and the post-flood season based on the reservoir water surface line and the highest flood control level, and to formulate a water level rise plan. The analysis module is used to construct a runoff regulation model for hydropower stations, determine the hydropower indicators of hydropower stations under each of the aforementioned water level rise schemes, and analyze the comprehensive benefits after the water level rise. The decision-making module is used to determine the economic indicators under each of the water level raising schemes, conduct economic comparative analysis, and determine the final recommended water level raising scheme.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for raising the operating water level of an existing hydropower station based on phased design floods as described in any one of claims 1 to 8.

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