Main hydraulic power plant dry water early warning method and system considering upstream and downstream cooperation

Abstract

The invention discloses a main hydraulic power plant dry water early warning method and system considering upstream and downstream cooperation, and relates to the technical field of power dispatching. Measuring and calculating main hydroelectric comprehensive incoming water; measuring and calculating main hydroelectric power generation requirements; and in combination with the main hydroelectric comprehensive incoming water and the main hydroelectric power generation demand, evaluating the hydroelectric energy storage change and issuing an early warning. According to the method, the sum of effective natural incoming water and upstream drainage is calculated, accurate calculation of actual available water resources of main hydropower is achieved, dynamic adjustment of the early warning time range is achieved by introducing the concept of the early warning period and combining the natural incoming water prediction accuracy, the maximum, normal and minimum power generation requirements are calculated respectively, and the power generation efficiency is improved. The method achieves the comprehensive evaluation of the power generation demands in different operation scenes, can achieve the early warning of the dry water degree of the main hydropower more accurately, can eliminate the influence caused by the factors, such as upstream power generation, compared with a conventional method, and is more objective.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power dispatching, and in particular to a method and system for early warning of low water levels in a main hydropower plant taking into account upstream and downstream coordination. Background Art

[0002] Hydropower is not only an important power source for grid dispatching and operation, but also an important flexible regulation resource for power operation. Hydropower plant low water warning is essentially a warning of the expected power generation and regulation capacity of the hydropower plant, which plays an important role in the evaluation of power supply. The traditional grid hydropower plant low water warning mainly considers two factors: the level of water inflow and the expected water level change. Taking the current hydropower plant low water warning of the Southern Power Grid as an example, the hydropower plant low water warning is divided into three levels of yellow, orange and red according to the severity of the impact, from light to heavy.

[0003] The traditional method for warning low water levels in hydropower plants has relatively simple criteria, requires less data, and is easy to implement. However, with the increasing requirements for lean grid dispatching and operation, the requirements for hydropower plant operation and control under the new power system are more sophisticated. The traditional method for warning low water levels in hydropower plants faces the following problems:

[0004] First, the forecast analysis of actual water inflow is not comprehensive. The water inflow of cascade hydropower stations includes both natural water in the upstream basin and power generation and drainage of the upper power station. The current weather forecast can only provide natural water inflow, but not power generation and drainage of the upper power station, which will lead to conservative assessment results.

[0005] Second, the measurement and analysis of power generation demand is unscientific. Cascade hydropower generation has a strong adjustable capacity. If the water flow is dry, the power generation of the hydropower station will drop significantly during the shutdown and water storage period, resulting in the average daily power generation in the previous stage may be extremely low, causing a large difference between the evaluation results of traditional methods and the actual situation.

[0006] Third, the early warning standard is unreasonable. The traditional method uses the time it takes for the cascade hydropower water level to drop to the dead water level as the early warning judgment standard. Due to the unreasonable selection of its power generation benchmark, the hydropower water level may not drop to the dead water level for a long time, while the actual water level of the power station is already low and does not have the power generation capacity. The traditional method cannot effectively reveal the above operating characteristics, affecting the early warning effect. Summary of the invention

[0007] In view of the above-mentioned problems of incomplete prediction and analysis of actual water inflow, unscientific calculation and analysis of power generation demand and unreasonable early warning standards, the present invention is proposed.

[0008] Therefore, the technical problem solved by the present invention is: comprehensively considering the upstream power generation drainage and the natural water inflow in the basin, calculating the comprehensive water inflow of the main hydropower, evaluating the changing trend of hydropower energy storage and issuing early warnings according to the power generation demand in different scenarios.

[0009] To solve the above technical problems, the present invention provides the following technical solutions: a method for low water warning of main hydropower plants taking into account upstream and downstream coordination, comprising: collecting basic data of cascade hydropower; calculating the comprehensive water inflow of main hydropower according to the basic data of cascade hydropower and the coordination relationship between upstream and downstream of cascade hydropower; calculating the power generation demand of main hydropower according to the basic data of cascade hydropower and the operation scenario of hydropower stations; and evaluating the changes in hydropower energy storage and issuing warnings in combination with the comprehensive water inflow of main hydropower and the power generation demand of main hydropower.

[0010] As a preferred solution of the method for early warning of low water levels in main hydropower plants taking into account upstream and downstream coordination of the present invention, the basic data of cascade hydropower include: cascade hydropower design parameters, cascade hydropower design parameters include designed maximum power generation output, minimum power generation output, and designed power generation water consumption rate; cascade hydropower historical operation data, cascade hydropower historical operation data include power generation historical data and daily average water inflow historical data; cascade hydropower prediction data, cascade hydropower prediction data is data in water inflow forecast.

[0011] As a preferred solution of the main hydropower plant low water early warning method considering upstream and downstream coordination of the present invention, wherein: calculating the main hydropower comprehensive water inflow includes calculating the main hydropower effective natural water inflow, and the calculation formula of the main hydropower effective natural water inflow is as follows:

[0012]

[0013] in, It indicates the effective natural water supply in the basin where the main hydropower station h is located on the operation day d, Q hh,d represents the natural water inflow of the cascade hydropower hh on the day of operation, H(h) represents the set of all hydropower plants within the range of the main hydropower h to the main hydropower of the previous level; the upstream drainage of the main hydropower is calculated, and the calculation formula of the upstream drainage of the main hydropower is as follows:

[0014]

[0015] in, It represents the upstream discharge volume of the main hydropower station on the operating day d, represents the average daily power generation of the upstream main hydropower station h-1 in the previous period, It represents the average water consumption rate of cascade hydropower h-1; the comprehensive water inflow of the main hydropower is the sum of the effective natural water inflow of the main hydropower and the upstream drainage of the main hydropower. The calculation formula of the comprehensive water inflow of the main hydropower is as follows:

[0016]

[0017] in, It indicates the comprehensive water inflow on the main hydropower station h operation day d, It indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. It indicates the upstream discharge volume on the main hydropower station h operation day d.

[0018] As a preferred solution of the main hydropower plant low water early warning method considering upstream and downstream coordination of the present invention, wherein: calculating the main hydropower generation demand includes calculating the maximum generation demand of the main hydropower, and the calculation formula of the maximum generation demand is as follows:

[0019]

[0020] in, It represents the maximum power generation demand of the main hydropower h, Indicates the maximum technical output of the main hydropower h; calculates the normal power generation demand of the main hydropower. The calculation formula for the normal power generation demand is as follows:

[0021]

[0022] in, Indicates the normal power generation demand of the main hydropower station. It indicates the average power generation of the main hydropower station in the same period of the previous year. To find the mean function, calculate the minimum power generation demand of the main hydropower. The calculation formula of the minimum power generation demand is as follows:

[0023]

[0024] in, represents the minimum power generation demand of the main hydropower h, It represents the minimum power generation requirement given by the cascade hydropower operation design, taking into account multiple constraints in power generation, ecology and shipping.

[0025] As a preferred solution of the main hydropower plant low water early warning method considering upstream and downstream coordination of the present invention, wherein: evaluating the change of hydropower storage energy and issuing early warnings include:

[0026] Determine the warning cycle; calculate the change in hydropower energy storage based on power generation demand to determine whether the energy storage will drop to the warning value; issue graded warnings, which include yellow warning, orange warning and red warning.

[0027] As a preferred solution of the main hydropower plant low water early warning method considering upstream and downstream collaboration of the present invention, wherein: determining the early warning period includes calculating the natural water inflow prediction accuracy, and the calculation formula of the natural water inflow prediction accuracy is as follows:

[0028]

[0029] Among them, P(t) represents the natural water inflow prediction accuracy, φ represents the slope parameter that controls the natural water inflow prediction accuracy, t represents the time point during the prediction period, and ψ represents the displacement parameter that controls the natural water inflow prediction accuracy. The formula for calculating the warning period based on the average of the natural water inflow prediction accuracy, comprehensive water inflow, and the average daily power generation during the same period is as follows:

[0030]

[0031] Among them, ND represents the warning period, φ represents the slope parameter that controls the accuracy of natural water inflow prediction, t represents the time point during the prediction period, and ψ represents the displacement parameter that controls the accuracy of natural water inflow prediction. It indicates the comprehensive water inflow on the main hydropower station h operation day d, It represents the average daily power generation of the hydropower station during the same period, and T represents the time period.

[0032] As a preferred solution of the method for warning low water level of main hydropower plant considering upstream and downstream coordination of the present invention, the issuance of graded warnings includes issuing a yellow warning if the natural water inflow is predicted to be lower than the multi-year average water inflow within the warning period, and the existing energy storage reduces the main hydropower energy storage to a warning value at the maximum power generation demand level. The conditions for issuing a yellow warning are as follows:

[0033]

[0034] in, It indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. The average water inflow of the main hydropower h in the same period, Q h,0 , They represent the initial hydropower storage of the main hydropower h and the hydropower storage warning value of the main hydropower h, ND represents the warning period, represents the maximum power generation demand of the main hydropower h, Indicates the comprehensive water inflow of the main hydropower h operation day d; if the natural water inflow predicted within the warning period is lower than the multi-year average water inflow, and the existing storage capacity reduces the main hydropower storage capacity to the warning value under the normal power generation demand level, an orange warning will be issued. The conditions for issuing an orange warning are as follows:

[0035]

[0036] in, Indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. The average water inflow of the main hydropower h in the same period, Q h,0 , are the initial hydropower storage of the main hydropower h and the hydropower storage warning value of the main hydropower h, ND is the warning period, Indicates the normal power generation demand of the main hydropower station. It indicates the comprehensive water inflow of the main hydropower h operation day d; if the natural water inflow is predicted to be lower than the multi-year average water inflow within the warning period, and the existing storage capacity reduces the main hydropower storage capacity to the warning value at the minimum power generation demand level, a red warning will be issued. The conditions for issuing a red warning are as follows:

[0037]

[0038] in, Indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. It represents the average water inflow of main hydropower h in the same period, Q h,0 , They are respectively the initial hydropower storage value and the hydropower storage warning value of the main hydropower, ND is the warning cycle, Indicates the minimum power generation demand of the main hydropower h.

[0039] Another object of the present invention is to provide an adaptive access system for a hybrid photovoltaic storage and distribution system, comprising: a data collection module for collecting basic data of cascade hydropower; a first calculation module for calculating the comprehensive inflow of main hydropower based on the basic data of cascade hydropower and the coordination relationship between the upstream and downstream of cascade hydropower; a second calculation module for calculating the main hydropower generation demand based on the basic data of cascade hydropower and the operation scenario of the hydropower station; an early warning module for evaluating the changes in hydropower energy storage and issuing early warnings in combination with the comprehensive inflow of main hydropower and the main hydropower generation demand.

[0040] A computer device includes a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of the main hydropower plant low water early warning method considering upstream and downstream collaboration are implemented as described above.

[0041] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of the main hydropower plant low water early warning method considering upstream and downstream collaboration are implemented as described above.

[0042] The beneficial effects of the present invention are as follows: by calculating the sum of effective natural water inflow and upstream drainage, the actual available water resources of the main hydropower can be accurately calculated, and the influence of upstream hydropower is taken into account. Compared with traditional methods, it is more comprehensive, improves the accuracy of water resource prediction, and provides a more reliable basis for subsequent early warning judgment; by calculating the maximum, normal and minimum power generation demands respectively, a comprehensive assessment of power generation demands under different operating scenarios is achieved. This multi-level demand analysis takes into account various restrictions and historical data on hydropower operation, providing the early warning system with a more comprehensive reference to power generation demand that is more in line with actual operating conditions. By introducing the concept of early warning cycle and combining it with the accuracy of natural water inflow prediction, it realizes dynamic adjustment of the early warning time range, so that the early warning cycle can change adaptively according to actual conditions. It will not cause inaccurate warnings due to too long a cycle, nor will it lose predictability due to too short a cycle. It can balance the timeliness and accuracy of early warnings. Through a more appropriate early warning cycle, it helps hydropower stations to allocate water resources on a longer time scale. By setting three levels of yellow, orange and red warnings, and triggering corresponding warnings according to different changes in energy storage, it realizes hierarchical management of low water risks, which helps hydropower managers to take corresponding countermeasures, improve the operation and management efficiency of hydropower stations, and reduce low water risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0044] Figure 1 This is a schematic diagram of the structure of a terminal in the first embodiment of the present invention;

[0045] Figure 2 It is a schematic diagram of the process of the present invention;

[0046] Figure 3 This is a schematic diagram of cascade hydropower of the present invention;

[0047] Figure 4 This is a schematic diagram of the H regulation cascade of the hydropower station;

[0048] Figure 5 FIG. 4 is a schematic diagram of the structure of a computer device in a third embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0050] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0051] Example 1

[0052] Reference Figure 1 , which is an embodiment of the present invention, provides a low water early warning method for a main hydropower plant taking into account upstream and downstream coordination.

[0053] First, the main hydropower plant low water early warning method considering upstream and downstream coordination provided by this application can be applied to Figure 1 In the terminal shown. Figure 1 As shown, the terminal may include one or two ( Figure 1 Only one is shown in the figure) processor and memory for storing data, wherein the processor may include but is not limited to a processing system such as a microprocessor MCU or a programmable logic device FPGA. The above terminal may also include a transmission device and an input and output device for communication functions. It can be understood by ordinary technicians in this field that Figure 1 The structure shown is only for illustration and does not limit the structure of the above terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0054] The memory can be used to store computer programs, such as the computer program corresponding to the method for early warning of low water level of the main hydropower plant considering upstream and downstream collaboration in this embodiment. The processor executes various functional applications and data processing by running the computer program stored in the memory, that is, implementing the above method. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage systems, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0055] The transmission device is used to receive or send data via a network. The above network includes a wireless network provided by a communication provider of the terminal. In one example, the transmission device includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device can be a radio frequency (Radio Frequency, referred to as RF) module, which is used to communicate with the Internet wirelessly.

[0056] like Figures 2 to 4 As shown, the embodiment of the present invention provides a method for early warning of low water level in a main hydropower plant considering upstream and downstream coordination. Figure 1 The terminal in is used as an example to illustrate, including the following steps:

[0057] S1: Collect basic data on cascade hydropower.

[0058] Specifically, the source of the collected data is the water inflow forecast of cascade hydropower basins, that is, the natural water inflow in the basin of each cascade hydropower station, which comes from the meteorological management system; the cascade hydropower operation characteristic data, including the maximum and minimum technical output requirements of cascade hydropower stations, comes from the power generation management system.

[0059] Furthermore, the basic data of cascade hydropower includes three categories, and the data content and related data sources are as follows:

[0060] The design parameters of cascade hydropower, including the designed maximum and minimum power output, the designed power generation water consumption rate, etc., are determined by the initial design parameters of cascade hydropower and are derived from the hydropower dispatching automation system;

[0061] The historical operation data of cascade hydropower, including power generation, daily average water inflow and other historical data, comes from the hydropower dispatching automation system;

[0062] Cascade hydropower forecast data, the cascade hydropower forecast data is the data in the water inflow forecast, and comes from the meteorological management system.

[0063] Furthermore, according to the difference in reservoir regulation capacity, cascade hydropower can be divided into long-cycle regulation cascade hydropower and short-cycle regulation cascade hydropower. Among them, short-cycle regulation cascade hydropower has a smaller reservoir capacity, which is generally daily regulation hydropower, that is, its power generation output can reduce its water level from high water level to dead water level within one day or a few days; long-cycle regulation cascade hydropower has a larger reservoir capacity, including multi-year regulation, annual regulation and seasonal regulation, and can carry more incoming water. The main hydropower plant dry water warning studied in this invention is mainly aimed at long-cycle regulation cascade hydropower. The reason is that short-cycle regulation cascade hydropower can maintain the water level at an appropriate level by relying on its upstream long-cycle regulation cascade hydropower; while long-cycle regulation cascade hydropower relies on natural water and upstream power generation and drainage. The watershed range of cascade hydropower refers to the basin interval from the hydropower to its upstream hydropower plant.

[0064] Further, the instructions are attached Figure 3 For example, the basin range of cascade hydropower 4 is the basin interval between hydropower plant 3 and hydropower plant 4, and the precipitation in this interval will directly affect cascade hydropower 4.

[0065] S2: Calculate the comprehensive water inflow of main hydropower based on the basic data of cascade hydropower and the coordination relationship between the upstream and downstream of cascade hydropower.

[0066] Specifically, the effective natural water supply of the main hydropower station is calculated. The effective natural water supply refers to the sum of the natural water supply in all river basins between the main hydropower station and its upstream adjacent main hydropower stations. Figure 3 For example, the effective natural water inflow of main hydropower station 4 is the sum of the natural water inflows in the basins of cascade hydropower stations 2, cascade hydropower stations 3, and cascade hydropower stations 4. The calculation formula for the effective natural water inflow of main hydropower stations is as follows:

[0067]

[0068] in, It indicates the effective natural water supply in the basin where the main hydropower station h is located on the operation day d, Q hh,d It represents the natural water inflow in the basin d on the operating day of cascade hydropower station hh, and H(h) represents the set of all hydropower plants within the range of the main hydropower station h to the main hydropower station of the next higher level.

[0069] Furthermore, compared with the traditional method which only considers the natural inflow within the watershed of the power station, the method proposed in the present invention will calculate the natural inflow within the watershed of the power station and the effective natural inflow of all hydropower plants within the scope of the upper-level main hydropower station. The reason is that the natural inflow within the watershed of the short-term regulation cascade hydropower within this scope will also naturally converge to the downstream main hydropower station.

[0070] Furthermore, the upstream drainage of the main hydropower station is calculated, that is, the daily drainage of the main hydropower station upstream. Figure 3For example, the upstream drainage of main hydropower station 4 is the power generation drainage of main hydropower station 1. The upstream drainage of main hydropower station in the previous stage is used as the predicted value of upstream drainage in the later stage. The calculation formula of upstream drainage of main hydropower station is as follows:

[0071]

[0072] in, It represents the upstream discharge volume of the main hydropower station on the operating day d, represents the average daily power generation of the upstream main hydropower station h-1 in the previous period, It represents the average water consumption rate of cascade hydropower h-1.

[0073] Furthermore, the statistical time of the daily average power generation of the upstream main hydropower in the previous stage should match the downstream power generation flow discharge time lag period, and in principle, the daily average power generation within the discharge time lag period is counted. The discharge time lag period is a basic design parameter of cascade hydropower, which is used to quantify the time for the upstream hydropower generation water consumption to be discharged to the downstream hydropower.

[0074] Furthermore, the short-term regulation cascade hydropower between the main hydropower stations cannot play a strong role in water storage, which will lead to the discharge of power generated by the upstream main hydropower station being collected at the downstream main hydropower station in a relatively short period of time (a few days). Therefore, when calculating the upstream discharge of the main hydropower station, the upstream main hydropower station should be considered, rather than the short-term regulation cascade hydropower station near the upstream.

[0075] Furthermore, there are many factors affecting the power generation of the main hydropower station, including the water inflow of its basin, its own water level, the water level of downstream hydropower stations, the overall power generation demand of the power grid, etc. The internal influencing mechanism of the above factors is relatively complex, and it is not a simple linear or nonlinear relationship. From the actual operation point of view, the power generation of the main hydropower station has temporal continuity, and its purpose is to stabilize the coordinated relationship between upstream and downstream power generation and maintain the overall supply and demand structure balance. To this end, the present invention proposes to use the average power generation in the previous stage as the basis for calculating the upstream drainage.

[0076] Furthermore, the formula for calculating the comprehensive water inflow of the main hydropower, that is, the sum of the effective natural water inflow and upstream drainage, is as follows:

[0077]

[0078] in, Indicates the comprehensive water supply on the main hydropower h operation day, Indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. It indicates the upstream discharge volume on the operating day of the main hydropower station.

[0079] S3: Calculate the main hydropower generation demand based on the basic data of cascade hydropower and the operation scenarios of hydropower stations.

[0080] Specifically, the calculation formula for calculating the maximum power generation demand, that is, the corresponding power generation of cascade hydropower at the maximum technical output to maintain full power throughout the day is as follows:

[0081]

[0082] in, It represents the maximum power generation demand of the main hydropower h, Indicates the maximum technical output of the main hydropower station.

[0083] Furthermore, the normal power generation demand, that is, the main hydropower generation demand under normal water inflow level, is calculated by using the average daily power generation of the hydropower station in the same period in the past five years. The calculation formula for the main hydropower generation demand under normal water inflow level is as follows:

[0084]

[0085] in, Indicates the normal power generation demand of the main hydropower station. It indicates the average power generation of the main hydropower station in the same period of the previous year. To find the mean function.

[0086] Furthermore, the average daily power generation of the main hydropower in the same period is the average of multiple days in the year. It is necessary to use the averaging function to average the multi-year daily average again on this basis to obtain the multi-year and multi-day average for the same period.

[0087] Furthermore, the minimum power generation demand is calculated, that is, the power generation that meets the minimum requirements for hydropower operation. Cascade hydropower needs to meet multiple restrictions such as power generation, ecology, and shipping. There is a minimum daily power generation requirement, which is given by the design. The calculation formula for the minimum power generation requirement is as follows:

[0088]

[0089] in, represents the minimum power generation demand of the main hydropower h, It represents the minimum power generation requirement given by the design considering multiple constraints such as power generation, ecology, and shipping.

[0090] Furthermore, design refers to the basic data parameters of cascade hydropower dams and power generation. For example, the daily rise and fall of hydropower water levels is restricted by the dam type design, which will also affect the power generation output. During the design phase, multiple restrictive factors such as shipping, power generation, and ecology will be considered to obtain the overall minimum power generation requirements as the design parameters for cascade hydropower operations, which are required to be followed during the actual operation process.

[0091] S4: Based on the comprehensive water inflow of the main hydropower stations and the main hydropower generation demand, evaluate the changes in hydropower energy storage and issue early warnings.

[0092] Specifically, different warning cycles are comprehensively considered, the changes in the main hydropower energy storage under different levels of power generation demand are evaluated, and warnings are issued based on the changes in energy storage.

[0093] Furthermore, the early warning cycle is calculated; the early warning cycle refers to a reasonable extended evaluation period after considering the accuracy of natural water inflow prediction. As time goes by, the accuracy of natural water inflow prediction will significantly decrease. If the accuracy of natural water inflow prediction is lower than the given limit, there may be a greater risk of early warning errors. Therefore, the accuracy of natural water inflow prediction is used as one of the basis for dividing the early warning cycle.

[0094] Furthermore, determining the early warning period includes calculating the natural water inflow prediction accuracy, and the calculation formula of the natural water inflow prediction accuracy is as follows:

[0095]

[0096] Among them, P(t) represents the natural water inflow prediction accuracy, φ represents the slope parameter that controls the natural water inflow prediction accuracy, t represents the time point during the prediction period, and ψ represents the displacement parameter that controls the natural water inflow prediction accuracy.

[0097] Furthermore, the slope parameter and the displacement parameter are obtained by analyzing and fitting the historical data.

[0098] Furthermore, the formula for calculating the warning period based on the natural water inflow prediction accuracy, comprehensive water inflow and daily average power generation is as follows:

[0099]

[0100] Among them, ND represents the warning period, φ represents the slope parameter that controls the accuracy of natural water inflow prediction, t represents the time point during the prediction period, and ψ represents the displacement parameter that controls the accuracy of natural water inflow prediction. It indicates the comprehensive water inflow on the main hydropower station h operation day d, It represents the average daily power generation of the hydropower station during the same period, and T represents the time period.

[0101] Preferably, by introducing the integral of the natural water inflow prediction accuracy over time, the quantification of the cumulative reliability of the prediction is achieved, the increased uncertainty of the long-term prediction is taken into account, and the false warning caused by inaccurate long-term prediction is effectively avoided; by comparing the current comprehensive water inflow with the historical average power generation, an accurate assessment of the current water resource sufficiency is achieved, the actual operating conditions are taken into account, and the deviation that may be caused by relying solely on historical data is avoided, so that the warning cycle is more in line with the actual operating conditions; by combining the prediction reliability and the actual water resource conditions, the dynamic adjustment of the warning cycle is achieved, so that the warning cycle can be adaptively changed according to the actual situation, and the warning will not be inaccurate due to the long cycle, nor will it lose predictability due to the short cycle, and the timeliness and accuracy of the warning can be balanced. Through this scientific warning cycle calculation method, a more reliable decision-making basis is provided for hydropower station managers, which helps managers make correct operational decisions within an appropriate time frame, and can respond to possible low water risks as soon as possible, and will not affect normal power generation due to excessive conservatism; through a more accurate warning cycle, it is helpful for hydropower stations to allocate water resources on a longer time scale, so that hydropower stations can better balance short-term and long-term water demand, and maintain ecological water use while ensuring power supply.

[0102] Furthermore, if the natural water inflow is predicted to be lower than the multi-year average water inflow within the warning period, and the existing storage capacity will cause the main hydropower storage capacity to drop to the warning value at the maximum power generation demand level, a yellow warning will be issued. The conditions for issuing a yellow warning are as follows:

[0103]

[0104] in, Indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. It represents the average water inflow of main hydropower h in the same period, Q h,0 , They represent the initial hydropower storage and hydropower storage warning value of the main hydropower, ND represents the number of days of the warning cycle, It represents the maximum power generation demand of the main hydropower h, It indicates the comprehensive water inflow on the operating day of the main hydropower station.

[0105] Furthermore, if the natural water inflow is predicted to be lower than the multi-year average water inflow within the warning period, and the existing storage capacity will cause the main hydropower storage capacity to drop to the warning value under the normal power generation demand level, an orange warning will be issued. The conditions for issuing an orange warning are as follows:

[0106]

[0107] in, Indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. The average water inflow of the main hydropower h in the same period, Q h,0 , They are respectively the initial hydropower storage value and the hydropower storage warning value of the main hydropower, ND is the warning cycle, Indicates the normal power generation demand of the main hydropower station.

[0108] Furthermore, if the natural water inflow is predicted to be lower than the multi-year average water inflow within the warning period, and the existing storage capacity will cause the main hydropower storage capacity to drop to the warning value at the minimum power generation demand level, a red warning will be issued. The conditions for issuing a red warning are as follows:

[0109]

[0110] in, Indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. The average water inflow of the main hydropower h in the same period, Q h,0 , They are respectively the initial hydropower storage value and the hydropower storage warning value of the main hydropower, ND is the warning cycle, It represents the minimum power generation demand of main hydropower h.

[0111] Furthermore, the corresponding handling measures for yellow, orange and red warnings are related to the dispatching principles, and are comprehensively affected by factors such as the power supply structure of the provincial power grid, the source of power generation, and the characteristics of electricity consumption.

[0112] Example 2

[0113] Reference Figure 1 to Figure 4 , as an embodiment of the present invention, provides a hybrid photovoltaic storage and distribution system adaptive access system, including:

[0114] Data collection module, used to collect basic data of cascade hydropower;

[0115] The first calculation module is used to calculate the comprehensive water inflow of the main hydropower according to the basic data of cascade hydropower and the coordination relationship between the upstream and downstream of cascade hydropower;

[0116] The second calculation module is used to calculate the main hydropower generation demand based on the basic data of cascade hydropower and the operation scenario of hydropower stations;

[0117] The early warning module is used to evaluate the changes in hydropower energy storage and issue early warnings based on the comprehensive water inflow of the main hydropower and the main hydropower generation demand.

[0118] For the specific limitations of the adaptive access system of the hybrid photovoltaic storage and distribution system, please refer to the limitations of the low water warning method of the main hydropower plant considering upstream and downstream coordination in the above text, which will not be repeated here. Each module in the above-mentioned adaptive access system of the hybrid photovoltaic storage and distribution system can be implemented in whole or in part through software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0119] This method can more accurately warn of the degree of low water levels in major hydropower stations. Compared with traditional methods, it can eliminate the impact of factors such as upstream power generation and is more objective.

[0120] Example 3

[0121] Reference Figure 5 , which is the third embodiment of the present invention. Based on the first two embodiments, the embodiment of the present invention provides a computer device, which may be a server, and its internal structure diagram may be as shown in FIG. Figure 5 As shown. The computer device includes a processor, a memory and a network interface connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium.

[0122] The database of the computer device is used to store action detection data. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the steps in any of the above-mentioned sparse tensor operation acceleration method embodiments are implemented.

[0123] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0124] In one embodiment, an embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps in any of the above-mentioned sparse tensor operation acceleration method embodiments are implemented.

[0125] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0126] Example 4

[0127] As an embodiment of the present invention, a method for early warning of low water level in a main hydropower plant taking into account upstream and downstream coordination is provided to verify the beneficial effects of the present invention.

[0128] Specifically, a cascade hydropower station H in southwest my country is selected as the evaluation object, as shown in the attached manual. Figure 4 As shown, the hydropower station is an annual regulation power station, the upstream hydropower station H-1 is a daily regulation power station, and H-2 is an annual regulation power station. The daily hydropower storage of hydropower station H to be evaluated is 100 million kWh, and the hydropower storage warning value is 60 million kWh.

[0129] Furthermore, if the traditional hydropower station low water warning method is adopted, the expected water inflow of hydropower station H only considers its basin area, that is, the meteorological forecast precipitation in the basin area of ​​hydropower station H in the figure; the daily average power generation in the previous 10 days is used as its expected daily power generation to evaluate the water level changes in the next 10 days. As shown in Table 1, it is expected that hydropower station H will reach the hydropower storage warning value in 8 days, and a red warning needs to be issued.

[0130] Table 1. Evaluation results of traditional early warning methods

[0131] Hydropower Station H Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7 Day 8 Average daily water inflow / billion degrees 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Daily average power generation / billion kWh 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Hydropower storage / 100 million kWh 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60

[0132] Furthermore, if the method of the present invention is adopted, there are the following differences:

[0133] The expected water inflow of hydropower station H needs to take into account the expected precipitation of all cascade hydropower stations within the range from the hydropower station to the upstream main hydropower station (i.e., hydropower station H-2) and the power generation and drainage generated by the upstream main hydropower station, and calculate its expected water inflow in a comprehensive manner;

[0134] Coordinate its maximum and minimum power generation capacity and the average power generation over multiple days in the same period to calculate its maximum power generation demand level, normal power generation demand level, and minimum power generation demand level respectively;

[0135] According to the different levels of power generation demand, the hydropower station issues early warnings based on changes in hydropower storage.

[0136] As shown in Table 2, by using the early warning method of the present invention, the hydropower station should issue a yellow warning only when the hydropower storage capacity drops to a warning value at the maximum power generation demand level.

[0137] Table 2 Early warning results of the early warning method of the present invention

[0138]

[0139] In summary, the reason for the above differences is that the traditional early warning method does not fully consider the upstream and downstream coordination relationship of the hydropower station, the expected water inflow assessment is incomplete, and the adjustability of the hydropower station's own power generation capacity is not considered, resulting in the assessment and early warning being conservative and inaccurate.

[0140] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for early warning of low water level in a main hydropower plant considering upstream and downstream coordination, characterized in that: include: Collect basic data on cascade hydropower; Calculate the comprehensive water inflow of the main hydropower according to the basic data of the cascade hydropower and the coordination relationship between the upstream and downstream of the cascade hydropower; Calculate the demand for main hydropower generation based on the basic data of the cascade hydropower and the operation scenarios of the hydropower stations; Based on the comprehensive water inflow of the main hydropower and the power generation demand of the main hydropower, the changes in hydropower energy storage are evaluated and early warnings are issued.

2. The method for early warning of low water level of main hydropower plants taking into account upstream and downstream coordination as claimed in claim 1 is characterized by: The basic data of the cascade hydropower include: Cascade hydropower design parameters, including the designed maximum power generation output, the minimum power generation output, and the designed power generation water consumption rate; Cascade hydropower historical operation data, including historical data on power generation and historical data on average daily water inflow; Cascade hydropower prediction data, wherein the cascade hydropower prediction data includes natural precipitation in the corresponding river basins of each cascade hydropower.

3. The method for early warning of low water level of main hydropower plants considering upstream and downstream coordination as claimed in claim 2 is characterized by: The calculation of the main hydropower comprehensive water inflow includes: Calculate the effective natural water supply of the main hydropower, the calculation formula of the effective natural water supply of the main hydropower is as follows: in, It indicates the effective natural water supply in the basin where the main hydropower station h is located on the operation day d, Q hh,d represents the natural water inflow in the basin d on the day when the cascade hydropower station hh is in operation, and H(h) represents the set of all hydropower plants within the range from the main hydropower station h to the main hydropower station of the previous level; Calculate the upstream drainage of the main hydropower station. The calculation formula for the upstream drainage of the main hydropower station is as follows: in, It represents the upstream discharge volume of the main hydropower station on the operating day d, represents the average daily power generation of the upstream main hydropower station h-1 in the previous period, It represents the average water consumption rate of cascade hydropower h-1; The comprehensive water inflow of the main hydropower is the sum of the effective natural water inflow of the main hydropower and the upstream drainage of the main hydropower. The calculation formula of the comprehensive water inflow of the main hydropower is as follows: in, It indicates the comprehensive water inflow on the main hydropower station h operation day d, It indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. It indicates the upstream discharge volume on the main hydropower station h operation day d.

4. The method for early warning of low water level in a main hydropower plant taking into account upstream and downstream coordination as claimed in claim 3 is characterized by: The calculation of the main hydropower generation demand includes: The maximum power generation demand of the main hydropower is calculated. The calculation formula of the maximum power generation demand is as follows: in, It represents the maximum power generation demand of the main hydropower h, It indicates the maximum technical output of the main hydropower h; Calculate the normal power generation demand of the main hydropower, the calculation formula of the normal power generation demand is as follows: in, Indicates the normal power generation demand of the main hydropower station. It indicates the average power generation of the main hydropower station in the same period of the previous year. To find the mean function; Calculate the minimum power generation demand of the main hydropower. The calculation formula for the minimum power generation demand is as follows: in, represents the minimum power generation demand of the main hydropower h, It represents the minimum power generation requirement given by the design, taking into account multiple constraints of power generation, ecology and shipping.

5. The method for early warning of low water level in a main hydropower plant taking into account upstream and downstream coordination as claimed in claim 4 is characterized by: The assessment of hydropower storage changes and issuance of early warnings include: Determine the warning cycle; Calculate the change in hydropower storage based on power generation demand and determine whether the storage will drop to the warning value; A graded warning is issued, which includes yellow warning, orange warning and red warning.

6. The method for early warning of low water level in a main hydropower plant taking into account upstream and downstream coordination as claimed in claim 5, characterized in that: Determining the early warning cycle includes: The natural water forecast accuracy is calculated, and the calculation formula of the natural water forecast accuracy is as follows: Where P(t) represents the natural water inflow prediction accuracy, φ represents the slope parameter that controls the natural water inflow prediction accuracy, t represents the time point during the prediction period, and ψ represents the displacement parameter that controls the natural water inflow prediction accuracy; The formula for calculating the warning period based on the natural water inflow prediction accuracy, comprehensive water inflow, and the average daily power generation during the same period is as follows: Among them, ND represents the warning period, φ represents the slope parameter that controls the accuracy of natural water inflow prediction, t represents the time point during the prediction period, and ψ represents the displacement parameter that controls the accuracy of natural water inflow prediction. It indicates the comprehensive water inflow on the main hydropower station h operation day d, It represents the average daily power generation of the hydropower station during the same period, and T represents the time period.

7. The method for early warning of low water level in a main hydropower plant taking into account upstream and downstream coordination as claimed in claim 6, characterized in that: The issuance of graded warnings includes: If the natural water inflow is predicted to be lower than the multi-year average water inflow within the warning period, and the existing storage capacity reduces the main hydropower storage capacity to the warning value at the maximum power generation demand level, a yellow warning will be issued. The conditions for issuing the yellow warning are as follows: in, It indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. It represents the average water inflow of main hydropower h in the same period, Q h,0 , They represent the initial hydropower storage of the main hydropower h and the hydropower storage warning value of the main hydropower h, ND represents the warning period, represents the maximum power generation demand of the main hydropower h, It indicates the comprehensive water inflow on the main hydropower h operation day d; If the natural water inflow is predicted to be lower than the multi-year average water inflow within the warning period, and the existing storage capacity reduces the main hydropower storage capacity to the warning value under the normal power generation demand level, an orange warning will be issued. The conditions for issuing the orange warning are as follows: in, Indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. It represents the average water inflow of main hydropower h in the same period, Q h,0 , are the initial hydropower storage of the main hydropower h and the hydropower storage warning value of the main hydropower h, ND is the warning period, Indicates the normal power generation demand of the main hydropower station. It indicates the comprehensive water inflow on the main hydropower h operation day d; If the natural water inflow is predicted to be lower than the multi-year average water inflow within the warning period, and the existing storage capacity at the minimum power generation demand level reduces the main hydropower storage capacity to the warning value, a red warning will be issued. The conditions for issuing the red warning are as follows: in, Indicates the effective natural water supply in the basin where the main hydropower station h is located on the day d of operation. It represents the average water inflow of main hydropower h in the same period, Q h,0 , They are respectively the initial hydropower storage value and the hydropower storage warning value of the main hydropower, ND is the warning cycle, Indicates the minimum power generation demand of the main hydropower h.

8. A system using the method for early warning of low water level in a main hydropower plant taking into account upstream and downstream coordination as described in any one of claims 1 to 7, characterized in that: include: Data collection module, used to collect basic data of cascade hydropower; The first calculation module is used to calculate the comprehensive water inflow of the main hydropower according to the basic data of the cascade hydropower and the coordination relationship between the upstream and downstream of the cascade hydropower; The second calculation module is used to calculate the main hydropower generation demand based on the basic data of the cascade hydropower and the operation scenario of the hydropower station; The early warning module is used to evaluate the change of hydropower energy storage and issue early warnings based on the comprehensive water inflow of the main hydropower and the power generation demand of the main hydropower.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for early warning of low water level in a main hydropower plant taking into account upstream and downstream coordination as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for early warning of low water level in a main hydropower plant taking into account upstream and downstream coordination as described in any one of claims 1 to 7 are implemented.

Images