Hydropower station group historical runoff data restoration method, system, equipment and medium

Abstract

The invention relates to a hydropower station group historical runoff data restoration method, system and device and a medium, and the method comprises the steps: obtaining a runoff type hydropower station reference of a storage capacity type hydropower station according to the runoff similarity between the runoff type hydropower station and the storage capacity type hydropower station in a hydropower station group; according to the hydraulic characteristics of the runoff type hydropower station, the runoff process referred by the runoff type hydropower station is obtained, the runoff trend is obtained based on the runoff process, and the runoff trend serves as the runoff trend reference of the reservoir capacity type hydropower station. The runoff trend is enlarged by referring to the same multiple ratio, the water level process in the period referred by the enlarged runoff trend is restored, the runoff process of the reservoir capacity type hydropower station is determined by adjusting the runoff trend and referring to the same multiple ratio, and the runoff process of the reservoir capacity type hydropower station serves as historical runoff restoration data of the hydropower station. According to the method, the problem of low precision of historical runoff data reduction of the hydropower station group in related technologies is solved, and the precision of historical runoff data reduction is improved.

Description

Technical Field

[0001] The present application relates to the technical field of runoff data restoration, and in particular to a method, system, equipment and medium for restoring historical runoff data of a hydropower station group. Background Art

[0002] The power parameters of a hydropower station are closely related to the benefits of the power station owner, so the relevant departments generally record relatively complete power data. However, there is often a lack of records of hydraulic data of hydropower stations that are not directly related to the benefits of the power station owner, such as runoff, power generation flow, outflow flow, water level, etc. When there is no forecast data, using these historical hydraulic data, especially historical runoff data, to simulate the dispatch of hydropower station groups is an important means of evaluating the power generation benefits of hydropower stations. When these historical data are missing, it is difficult for hydropower station owners to carry out optimal dispatching of hydropower stations.

[0003] At present, the commonly used method for restoring the historical runoff data of a hydropower station group is to use the long-term historical hydrological data of the target basin to restore the runoff data of the target basin, or to restore the power generation data of the target hydropower station. However, the long-term historical hydrological data of the target basin is missing, resulting in low accuracy in the restoration of the historical runoff data of the hydropower station group. Summary of the invention

[0004] The embodiments of the present application provide a method, system, device and medium for restoring historical runoff data of a hydropower station group, so as to at least solve the problem of low accuracy in restoring historical runoff data of a hydropower station group in the related art.

[0005] In a first aspect, an embodiment of the present application provides a method for restoring historical runoff data of a hydropower station group, the method comprising:

[0006] According to the runoff similarity between the runoff type hydropower station and the reservoir type hydropower station in the hydropower station group, obtaining the runoff type hydropower station reference of the reservoir type hydropower station;

[0007] According to the hydraulic characteristics of the runoff hydropower station, a runoff process for reference of the runoff hydropower station is obtained, based on the runoff process, a runoff trend is obtained, and the runoff trend is used as a reference for the runoff trend of the reservoir-type hydropower station;

[0008] The runoff trend is enlarged with reference to the same multiple ratio, and the water level process within the period to which the enlarged runoff trend refers is restored. According to the relationship between the end-of-period water level in the water level process within the period and the preset end-of-period water level, the runoff process of the reservoir-type hydropower station is determined by adjusting the runoff trend with reference to the same multiple ratio, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station.

[0009] In one embodiment, the step of obtaining a run-of-river hydropower station reference of a reservoir-type hydropower station according to the runoff similarity between the run-of-river hydropower station and the reservoir-type hydropower station in the hydropower station group includes:

[0010] According to the relationship between the output of a hydropower station and the water inflow of the hydropower station, the runoff similarity between the run-of-river hydropower stations and the reservoir-type hydropower stations in the hydropower station group is obtained by analyzing the correlation between the output of different run-of-river hydropower stations and the output of the reservoir-type hydropower stations in the same area;

[0011] According to the strength of the runoff similarity, a runoff hydropower station with strong runoff similarity is obtained as a runoff hydropower station reference of the reservoir-type hydropower station.

[0012] In one embodiment, the correlation between the outputs of different run-of-river hydropower stations and the outputs of reservoir-type hydropower stations in the same region is analyzed, including:

[0013] By calculating the Pearson correlation coefficient between the daily power generation of different run-of-river hydropower stations and reservoir-type hydropower stations in the same area, the correlation between the daily power generation of the run-of-river hydropower station and the reservoir-type hydropower station is obtained, and the correlation of the daily power generation is used as the strength of the correlation between the output of the run-of-river hydropower station and the output of the reservoir-type hydropower station.

[0014] In one embodiment, the step of obtaining a runoff process for reference of the runoff hydropower station according to the hydraulic characteristics of the runoff hydropower station, obtaining a runoff trend based on the runoff process, and using the runoff trend as a reference for the runoff trend of the reservoir-type hydropower station includes:

[0015] According to the characteristic that the run-of-river hydropower station does not have an adjustable storage capacity, information is obtained that the output of the run-of-river hydropower station is determined by the incoming water, and the run-of-river water head is taken as a fixed value;

[0016] Based on the output of the run-of-river hydropower station and the water head of the run-of-river hydropower station, the runoff process referenced by the run-of-river hydropower station is calculated by an output calculation formula;

[0017] Based on the runoff process of the runoff hydropower station as a reference, the runoff trend is obtained by normalizing the trend of the runoff process, and the runoff trend is used as a reference for the runoff trend of the reservoir-type hydropower station.

[0018] In one embodiment, the runoff trend is enlarged with reference to the same multiple ratio, and the water level process in the cycle referred to by the enlarged runoff trend is restored. According to the relationship between the end-of-cycle water level in the water level process in the cycle and the preset end-of-cycle water level, the runoff process of the reservoir-type hydropower station is determined by adjusting the runoff trend reference to the same multiple ratio, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station, including:

[0019] According to a preset multiple ratio value, the runoff trend reference of the reservoir-type hydropower station is expanded to match the actual operation demand of the reservoir-type hydropower station;

[0020] Obtain the water level change process of the runoff trend reference after expansion through the daily power generation flow, and determine the water level process within the cycle of the runoff trend reference after expansion based on the water level change process of the runoff trend reference, wherein the water level process within the cycle includes the water level at the end of the cycle;

[0021] The difference between the water level at the end of the period and the water level at the end of the preset period is compared. When the difference is less than or equal to the preset value, the runoff process of the reservoir-capacity hydropower station is determined; when the difference is greater than the preset value, the runoff process of the reservoir-capacity hydropower station is determined by dichotomy and adjusting the runoff trend reference multiple ratio value until the difference is less than or equal to the preset value, and the runoff process of the reservoir-capacity hydropower station is used as the historical runoff restoration data of the hydropower station.

[0022] In one embodiment, before expanding the runoff trend reference of the reservoir-type hydropower station according to a preset multiple ratio value, the method further includes:

[0023] Define the current reservoir-type hydropower station and determine the specific identification of the current reservoir-type hydropower station;

[0024] Defining the total number of reduction cycle periods and the current period, determining the specific moment in the sequence between the reservoir-type hydropower stations and the entire calculation cycle;

[0025] Define the final water level of the restoration period, the preset starting water level and the preset final water level of the restoration period, and obtain the design flood flow of the dam site of the current reservoir-type hydropower station;

[0026] The initial power generation flow rate of the current calculation period is determined according to the maximum value and the minimum value of the power generation flow rate of the current reservoir-type hydropower station.

[0027] In one embodiment, the process of obtaining the water level change process of the runoff trend reference after expansion through the daily power generation flow includes:

[0028] According to the daily power generation, the output of the current period is obtained;

[0029] Compare the difference between the output of the current period and the actual output, and when the output difference is less than the preset output difference, obtain the water level change process of the runoff trend reference after expansion; when the output difference is greater than or equal to the preset output difference, adjust the power generation flow; wherein adjusting the power generation flow includes:

[0030] If the calculated output is greater than the actual output plus the allowable error range, the binary search method is used to find the value of the next power generation flow;

[0031] If the calculated output is less than the actual output minus the allowable error range, the binary search method is used to find the value of the next power generation flow.

[0032] In a second aspect, an embodiment of the present application provides a system for restoring historical runoff data of a hydropower station group, the system comprising a runoff hydropower station reference module, a runoff trend reference module and a module for restoring historical runoff data of a hydropower station, wherein:

[0033] The run-of-river hydropower station reference module is used to obtain a run-of-river hydropower station reference of the reservoir-type hydropower station according to the runoff similarity between the run-of-river hydropower station and the reservoir-type hydropower station in the hydropower station group;

[0034] The runoff trend reference module is used to obtain the runoff process of the runoff hydropower station according to the hydraulic characteristics of the runoff hydropower station, obtain the runoff trend based on the runoff process, and use the runoff trend as the runoff trend reference of the reservoir hydropower station;

[0035] The module for restoring the historical runoff data of the hydropower station is used to expand the runoff trend with reference to the same multiple ratio, and restore the water level process within the cycle referenced by the expanded runoff trend. According to the relationship between the end-of-cycle water level in the water level process within the cycle and the preset end-of-cycle water level, the runoff process of the reservoir-type hydropower station is determined by adjusting the runoff trend with reference to the same multiple ratio, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station.

[0036] In a third aspect, an embodiment of the present application provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, a method for restoring historical runoff data of a hydropower station group as described in the first aspect above is implemented.

[0037] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for restoring historical runoff data of a hydropower station group as described in the first aspect above.

[0038] The embodiments of the present application provide a method, system, device and medium for restoring historical runoff data of a hydropower station group, which have at least the following technical effects.

[0039] According to the runoff similarity between the runoff hydropower station and the reservoir-type hydropower station in the hydropower station group, the runoff hydropower station reference of the reservoir-type hydropower station is obtained. According to the hydraulic characteristics of the runoff hydropower station, the runoff process of the runoff hydropower station reference is obtained, and based on the runoff process, the runoff trend is obtained, and the runoff trend is used as the runoff trend reference of the reservoir-type hydropower station. The runoff trend reference is enlarged by the same multiple ratio, and the water level process in the cycle of the enlarged runoff trend reference is restored. According to the relationship between the end water level of the cycle in the water level process and the preset end water level of the cycle, the runoff process of the reservoir-type hydropower station is determined by adjusting the runoff trend reference same multiple ratio, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station. This application can restore the historical runoff sequence of the reservoir-type hydropower station only based on the historical output sequence of each power station in the cascade hydropower station group when the historical data of the hydropower station is very scarce, which lays a high-quality data foundation for the cascade hydropower station group in the data-poor area to evaluate the dispatching benefits of the hydropower station through simulated dispatching. The invention solves the problem of low accuracy in restoring historical runoff data of a hydropower station group in the related technology and improves the accuracy of restoring historical runoff data.

[0040] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0042] Figure 1 is a flow chart of a method for restoring historical runoff data of a hydropower station group according to an embodiment of the present application;

[0043] Figure 2 is a flowchart of step S101 according to an exemplary embodiment;

[0044] Figure 3 is a flowchart of step S102 according to an exemplary embodiment;

[0045] Figure 4 is a flowchart of step S103 according to an exemplary embodiment;

[0046] Figure 5 is a schematic diagram showing an output verification process of a reservoir-type hydropower station in a reduction period according to an exemplary embodiment;

[0047] Figure 6 is a schematic diagram showing a process of searching for runoff according to a target water level at the end of a restoration period according to an exemplary embodiment;

[0048] Figure 7 is a schematic diagram showing an error analysis of historical runoff restoration results of a storage capacity power station under different runoff references according to an exemplary embodiment;

[0049] Figure 8 is a schematic diagram showing a comparison between a historical runoff sequence of a storage capacity power station and a restored runoff sequence under three different runoff references according to an exemplary embodiment;

[0050] Fig. 9 is a block diagram of a system for restoring historical runoff data of a hydropower station group according to an exemplary embodiment;

[0051] Fig.10 is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0053] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0054] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0055] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0056] The following are the definitions of terms used in this application:

[0057] Run-of-the-river hydropower station: A run-of-the-river hydropower station is a type of hydropower station with little or no regulation capacity, and its power generation is almost entirely dependent on the amount of water flowing in that day. This type of hydropower station cannot store large amounts of water, so its power generation varies with the amount of water flowing in.

[0058] Reservoir-type hydropower station: Reservoir-type hydropower station refers to a hydropower station with a large reservoir capacity, which can adjust the water flow to meet different power generation needs. This type of hydropower station can store water during the flood season and release water to generate electricity during the dry season, thereby maintaining the stability of power generation.

[0059] Runoff process: Runoff process refers to the process of water flowing from surface sources such as rainfall or snowmelt into rivers, lakes or reservoirs. It describes the flow path and time distribution of water from the source to the destination. The runoff process is affected by factors such as topography, climate, vegetation, etc., and is one of the important bases for hydropower station power generation.

[0060] Runoff trend: Runoff trend refers to the changing trend of runoff volume over a period of time, which is usually a long-term change law obtained through historical data analysis. It can be used to predict future runoff volume.

[0061] Intra-periodic water level process: Intra-periodic water level process refers to the change process of reservoir water level in a certain period of time. This period of time can be one day, one week, one month or one year.

[0062] End-of-cycle water level: End-of-cycle water level refers to the water level of the reservoir at the end of a certain period of time. This period of time can be the end of a cycle (such as a day, a week, a month or a year).

[0063] Preset water level at the end of a cycle: The preset water level at the end of a cycle refers to the reservoir water level target at the end of the cycle set according to the plan or forecast.

[0064] Output: Output refers to the actual amount of electricity generated by a hydropower station within a certain period of time.

[0065] Incoming water: Incoming water refers to the amount of water flowing into the reservoir of a hydropower station.

[0066] Daily power generation: Daily power generation refers to the amount of electricity actually generated by a hydropower station in one day. There is a direct relationship between daily power generation and water inflow and output, because water inflow determines the power generation capacity, and the power generation capacity (output) reflects the actual power generation. That is, the output is obtained through water inflow, and daily power generation is the output for one day.

[0067] In a first aspect, an embodiment of the present application provides a method for restoring historical runoff data of a hydropower station group. Figure 1 It is a flow chart of restoring historical runoff data of a hydropower station group. Figure 1 As shown, a method for restoring historical runoff data of a hydropower station group includes:

[0068] Step S101: obtaining a run-of-river hydropower station reference of a reservoir-type hydropower station according to the runoff similarity between the run-of-river hydropower station and the reservoir-type hydropower station in a hydropower station group.

[0069] Step S102: according to the hydraulic characteristics of the runoff hydropower station, a runoff process for reference of the runoff hydropower station is obtained, based on the runoff process, a runoff trend is obtained, and the runoff trend is used as a reference for the runoff trend of the reservoir capacity hydropower station.

[0070] Step S103, expand the runoff trend with reference to the same multiple ratio, and restore the water level process within the cycle referenced by the expanded runoff trend, according to the relationship between the end-of-cycle water level in the water level process within the cycle and the preset end-of-cycle water level, by adjusting the runoff trend with reference to the same multiple ratio, determine the runoff process of the reservoir-type hydropower station, and use the runoff process of the reservoir-type hydropower station as the historical runoff restoration data of the hydropower station.

[0071] In summary, the embodiment of the application provides a method for restoring historical runoff data of a hydropower station group, by obtaining a runoff hydropower station reference of a reservoir-type hydropower station according to the runoff similarity between the runoff hydropower station and the reservoir-type hydropower station in the hydropower station group. According to the hydraulic characteristics of the runoff hydropower station, the runoff process of the runoff hydropower station reference is obtained, and based on the runoff process, the runoff trend is obtained, and the runoff trend is used as the runoff trend reference of the reservoir-type hydropower station. The runoff trend reference is enlarged by the same multiple ratio, and the water level process in the cycle of the enlarged runoff trend reference is restored. According to the relationship between the end water level of the cycle in the water level process and the preset end water level of the cycle, the runoff process of the reservoir-type hydropower station is determined by adjusting the same multiple ratio of the runoff trend reference, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station. This application can restore the historical runoff sequence of the reservoir-type hydropower station only based on the historical output sequence of each power station in the cascade hydropower station group when the historical data of the hydropower station is very scarce, laying a high-quality data foundation for the cascade hydropower station group in the data-poor area to evaluate the dispatching benefits of the hydropower station through simulated dispatching. The invention solves the problem of low accuracy in restoring historical runoff data of a hydropower station group in the related technology and improves the accuracy of restoring historical runoff data.

[0072] Figure 2 is a flowchart of step S101 according to an exemplary embodiment. Figure 2 As shown, step S101, according to the runoff similarity between the runoff type hydropower station and the reservoir type hydropower station in the hydropower station group, obtain the runoff type hydropower station reference of the reservoir type hydropower station. Specifically, it includes the following steps:

[0073] Step S1011, according to the relationship between the output of the hydropower station and the water inflow of the hydropower station, by analyzing the correlation between the output of different run-of-river hydropower stations and the output of the reservoir-type hydropower station in the same area, the runoff similarity between the run-of-river hydropower stations and the reservoir-type hydropower stations in the hydropower station group is obtained;

[0074] Step S1012: according to the strength of runoff similarity, a runoff hydropower station with strong runoff similarity is obtained as a runoff hydropower station reference of the reservoir-type hydropower station.

[0075] Optionally, the various hydropower stations in the same area have the same or similar meteorological conditions, natural geography, vegetation coverage and human activities, so their runoff processes also have a certain degree of similarity. The output is closely and directly related to the incoming water. Therefore, the correlation analysis between the outputs of different hydropower stations in the same area can indirectly reflect the strength of the similarity between their runoffs. Since the output of run-of-river hydropower stations depends almost entirely on the incoming water process, the output of reservoir-capacity hydropower stations is affected by the adjustable reservoir capacity. Therefore, in order to avoid the problem of reduced correlation between outputs due to reservoir capacity regulation, the daily power generation of each run-of-river hydropower station and reservoir-capacity hydropower station is used for correlation analysis. Using the Pearson correlation coefficient as an indicator, the correlation between the daily power generation of each reservoir-capacity hydropower station and the surrounding run-of-river hydropower stations is tested. The functional expression of the Pearson correlation coefficient is as follows:

[0076]

[0077] Where: R m-1,m is the Pearson correlation coefficient between the daily power generation of the m-1th run-of-river hydropower station and the mth reservoir hydropower station; D is the total number of daily power generation data; and They are the d-th day power generation data of the m-1th run-of-river hydropower station in the restoration period and the average daily power generation in the restoration period, in MWd; and They are the d-th day power generation data of the m-th reservoir-type hydropower station in the restoration period and the average daily power generation in the restoration period, in MWd;

[0078] Through correlation analysis, for reservoir-type hydropower stations and run-of-river hydropower stations with a strong correlation in daily power generation, it is believed that the runoff between them has a high similarity, and the power station is used as a reference power station for runoff restoration of the corresponding reservoir-type hydropower station.

[0079] Step S101 selects a suitable run-of-river hydropower station as a reference for the reservoir-type hydropower station by analyzing the runoff similarity between the run-of-river hydropower station and the reservoir-type hydropower station in the hydropower station group. Specifically, it includes analyzing the relationship between the output of the hydropower station and the water inflow, obtaining the runoff similarity, and selecting the reference power station according to the strength of the runoff similarity. By calculating the Pearson correlation coefficient, the run-of-river hydropower station with a strong correlation between the daily power generation is selected as a reference to improve the accuracy and reliability of runoff restoration.

[0080] Figure 3 is a flowchart of step S102 according to an exemplary embodiment. Figure 3As shown, step S102, according to the hydraulic characteristics of the runoff hydropower station, obtain the runoff process for reference of the runoff hydropower station, based on the runoff process, obtain the runoff trend, and use the runoff trend as a reference for the runoff trend of the reservoir hydropower station. Specifically, it includes the following steps:

[0081] Step S1021, according to the characteristic that the run-of-river hydropower station does not have an adjustable storage capacity, information is obtained that the output of the run-of-river hydropower station is determined by the incoming water, and the run-of-river water head is taken as a fixed value;

[0082] Step S1022, according to the characteristic that the run-of-river hydropower station does not have an adjustable storage capacity, information is obtained that the output of the run-of-river hydropower station is determined by the incoming water, and the run-of-river water head is taken as a fixed value;

[0083] Step S1023: Based on the runoff process of the runoff type hydropower station as a reference, the runoff trend is obtained by normalizing the trend of the runoff process, and the runoff trend is used as a reference for the runoff trend of the reservoir type hydropower station.

[0084] Alternatively, since the run-of-river hydropower station does not have an adjustable storage capacity, the output is almost entirely dependent on the incoming water, so its head can be approximately regarded as a fixed value. When the output is known and the head is fixed, the output calculation formula is used to calculate the runoff process of the reservoir-type hydropower station runoff reduction reference power station. The function expression of the output calculation formula is as follows:

[0085]

[0086] Where: is the output of hydropower station m in the tth period, in MW; A m is the output coefficient of hydropower station m; is the power generation flow of hydropower station m in the tth period, unit: m 3 / s; is the net water head of hydropower station m at the tth period, in m;

[0087] The runoff restoration of the reservoir-type hydropower station is normalized by referring to the runoff process of the power station, and only the runoff process trend is retained, and this trend process is used as the runoff trend reference of the corresponding reservoir-type hydropower station. The function expression of the normalized runoff process is as follows:

[0088]

[0089] In the formula, is the normalized runoff of power station m in the tth period during the reduction period; is the original runoff before normalization at power station m in the tth period during the restoration period, in units of: m 3 / s;Q max The maximum value of the original runoff during the restoration period, unit: m3 / s.

[0090] Step S102 simplifies the output calculation model by treating the head of the run-of-river hydropower station as a fixed value. The calculation efficiency is improved and the calculation complexity is reduced. The power generation flow of the run-of-river hydropower station is accurately calculated through the output calculation formula. The accurate runoff process is obtained to provide a reliable data basis for the subsequent runoff trend analysis. The runoff trend of the run-of-river hydropower station is obtained through normalization processing. The runoff trend is used as a reference for the runoff trend of the reservoir-type hydropower station, which improves the accuracy of runoff restoration.

[0091] In one embodiment, before expanding the runoff trend reference of the reservoir-type hydropower station according to the preset multiple ratio value, the method further includes:

[0092] Define the current reservoir-type hydropower station and determine the specific identification of the current reservoir-type hydropower station;

[0093] Define the total number of reduction cycle periods and the current period, determine the specific moment in the sequence between the reservoir capacity hydropower stations and the entire calculation cycle;

[0094] Define the final water level of the restoration period, the preset starting water level and the preset final water level of the restoration period, and obtain the design flood flow of the dam site of the current reservoir-type hydropower station;

[0095] According to the maximum and minimum values ​​of the current power generation flow of the reservoir-capacity hydropower station, the initial power generation flow of the current calculation period is determined.

[0096] Optionally, define the current reservoir capacity hydropower station as m; define the total number of restoration cycle periods as T, the current period as t; define the calculation end reservoir water level of the restoration cycle The starting upper reservoir water level for a given reduction cycle The water level of the last reservoir Let A∈[0,A m,max ], where A m,max Take the design flood flow of the dam site of power station m; expand the runoff trend in the reduction period by A times as the water inflow process of the reservoir-type hydropower station; assume that the initial power generation flow in the current calculation period is Q m,min =0, where Q m,max and Q m,min They are the maximum and minimum values ​​of the power generation flow of power station m, respectively, in units of: m 3 / s.

[0097] By defining the total number of reduction period periods T and the current period t, the time sequence of the calculation is clarified. Ensure that the calculation process is carried out in sequence and each period has a clear timestamp. Define the end water level endZend, the starting water level startZstart and the preset end water level endZend of the reduction period to clarify the boundary conditions of the water level change. Ensure that the water level change during the calculation process meets the preset requirements and improve the accuracy of the calculation results. Obtain the design flood flow of the dam site of the current reservoir-type hydropower station. As a reference flow in extreme cases, ensure the reliability of the calculation results. Determine the initial power generation flow of the current calculation period based on the maximum and minimum values ​​of the power generation flow. Provide a reasonable initial power generation flow value for the current calculation period to facilitate subsequent calculations.

[0098] Figure 4 is a flowchart of step S103 according to an exemplary embodiment. Figure 4 As shown, step S103, the runoff trend is enlarged by the same multiple ratio, and the water level process in the cycle referred to by the enlarged runoff trend is restored. According to the relationship between the end water level of the cycle in the water level process and the preset end water level of the cycle, the runoff process of the reservoir-type hydropower station is determined by adjusting the runoff trend reference same multiple ratio, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station. Specifically, the following steps are included:

[0099] Step S1031: according to a preset multiple ratio value, the runoff trend reference of the reservoir-type hydropower station is expanded to match the actual operation demand of the reservoir-type hydropower station.

[0100] Step S1032, obtaining the water level change process of the expanded runoff trend reference through the daily power generation flow, and determining the water level process within the cycle of the expanded runoff trend reference based on the water level change process of the runoff trend reference, wherein the water level process within the cycle includes the water level at the end of the cycle. Optionally, obtaining the water level change process of the expanded runoff trend reference through the daily power generation flow includes: obtaining the output of the current period according to the daily power generation; comparing the difference between the output of the current period and the actual output, and obtaining the water level change process of the expanded runoff trend reference when the output difference is less than the preset output difference; adjusting the power generation flow when the output difference is greater than or equal to the preset output difference; wherein adjusting the power generation flow includes: if the calculated output is greater than the actual output plus the allowable error range, using the binary search method to find the value of the next power generation flow downward; if the calculated output is less than the actual output minus the allowable error range, using the binary search method to find the value of the next power generation flow upward.

[0101] Step S1033, compare the difference between the water level at the end of the period and the water level at the end of the preset period, and when the difference is less than or equal to the preset value, determine the runoff process of the reservoir-type hydropower station; when the difference is greater than the preset value, use dichotomy and adjust the runoff trend to refer to the same multiple ratio value until the difference is less than or equal to the preset value, determine the runoff process of the reservoir-type hydropower station, and use the runoff process of the reservoir-type hydropower station as the historical runoff restoration data of the hydropower station.

[0102] Optionally, according to the preset multiple ratio value A, the runoff trend reference of the reservoir capacity hydropower station is expanded. By expanding the runoff trend reference, it can better match the actual operation requirements of the reservoir capacity hydropower station. The water level change process is calculated by the output calculation formula and the hydraulic formula. The water level process within the cycle of the expanded runoff trend reference is determined, including the water level at the end of the cycle. Based on the water level change process of the runoff trend reference, the water level process within the cycle of the runoff trend reference after restoration is determined. Calculate the difference between the end-of-cycle water level Zend and the preset end-of-cycle water level Zpreset. Check whether the end-of-cycle water level meets the preset requirements. If the difference is less than or equal to the preset value, it is considered that the runoff process meets the requirements. If the difference is greater than the preset value, it is necessary to adjust the runoff trend reference multiple ratio value. Adjust the multiple ratio value by dichotomy, gradually adjust the multiple ratio value until the difference is less than or equal to the preset value, and repeat the above steps until the difference is less than or equal to the preset value. The runoff process finally determined is used as the historical runoff restoration data of the reservoir capacity hydropower station. The determined runoff process is recorded as historical runoff restoration data.

[0103] Furthermore, S103 includes the following steps:

[0104] Step 3.1, define the current reservoir capacity hydropower station as m;

[0105] Step 3.2, define the total number of restoration period periods as T, and the current period as t;

[0106] Step 3.3, define the calculation end reservoir water level of the reduction period The starting upper reservoir water level for a given reduction cycle The water level of the last reservoir Let A∈[0,A m,max ], where A m,max Take the design flood flow of the dam site of power station m;

[0107] Step 3.4, the runoff trend in the reduction period is enlarged by A times as the water inflow process of the reservoir-type hydropower station;

[0108] Step 3.5, assuming that the initial power generation flow in the current calculation period is Q m,min =0, where Q m,max and Q m,minThey are the maximum and minimum values ​​of the power generation flow of power station m, respectively, in units of: m 3 / s;

[0109] Step 3.6, calculate the output in period t by using formulas (2) and (4)-(11), and then calculate the output and actual output Check, Figure 5 is a schematic diagram of an output verification process of a reservoir-type hydropower station in a reduction period according to an exemplary embodiment. Figure 5 As shown, if the force is calculated and actual output Satisfaction between ω=0.01 indicates the output allowable deviation accuracy, and the upper reservoir water level corresponding to the period t is recorded. Then return to step 3.5 to calculate the next period. Then use the binary search to find the next Values, such as Figure 5 As shown in the area (Ⅱ), then return to step 3.6 to continue the calculation; if Then use the binary search method to find the next Values, such as Figure 5 As shown in area (Ⅰ), then return to step 3.6 to continue the calculation;

[0110]

[0111] In the formula, N m and They are the upper and lower output limits of power station m, in MW; and They are the starting storage capacity and the final storage capacity of power station m in the tth period, respectively, in units of: m 3 ; and are the outflow and interval flow of power station m in the tth period, respectively, in units of: m 3 / s; is the outflow rate of the direct upstream power station m-1 of power station m during period t, in units of m 3 / s; Δt is the number of seconds in each period, take Δt = 60 × 60s; is the water level of power station m at time period t, in m; Z m and They are the upper and lower limits of the water level of power station m, in m; Q out,m The lower limit of the outflow flow of power station m, unit: m 3 / s; Q m and They are the upper and lower limits of the power generation flow of power station m, respectively, in units of: m 3 / s; is the tailwater level of power station m in period t, in m; ΔH m is the head loss constant of power station m, unit: m; f m,ZV (·) is the water level and reservoir capacity function of power station m; f m,ZQ (·) is the tailwater level and outflow flow function of power station m;

[0112] Step 3.7, if t>T, proceed to the next step of calculation, otherwise set t=t+1 and return to step 3.5 to continue calculation;

[0113] Step 3.8, if δ = 0.01 indicates the water level allowable deviation accuracy, so the runoff process under the current A value is the runoff process of the reservoir-type hydropower station. Figure 6 is a schematic diagram showing a process of searching for runoff according to a target water level at the end of a restoration period according to an exemplary embodiment. Figure 6 As shown in the simulated runoff curve, the runoff restoration calculation under the current reservoir-type hydropower station ends and goes to step 3.9; if Use the binary search method to find the next A value, get the new runoff process, and then return to step 3.4 to continue the calculation; if Use the binary search method to find the next A value upward to obtain a new water inflow process, and then return to step 3.4 to continue the calculation. The process of searching for a suitable runoff according to the water level at the end of the reduction period is as follows: Figure 2 shown.

[0114] Step 3.9, if m<M, set m=m+1 and return to step 3.2; otherwise, end the calculation. Where M represents the total number of reservoir-type hydropower stations.

[0115] Step S103 expands the runoff trend reference to make it better match the actual operation requirements of the reservoir-type hydropower station. The expanded runoff trend reference is more in line with the actual operation conditions, which improves the accuracy of the runoff process. The water level change process is calculated based on the daily power generation flow and the expanded runoff trend reference. By calculating the water level change process, it is ensured that the water level change meets the actual needs and the accuracy of the water level change process is improved. By comparing the difference between the water level at the end of the cycle and the preset water level at the end of the cycle, the runoff trend reference multiple ratio value is adjusted. By gradually adjusting the multiple ratio value, the difference between the water level at the end of the cycle and the preset water level at the end of the cycle meets the requirements, which improves the accuracy of the runoff process.

[0116] Examples of practical applications:

[0117] Taking a certain day regulation reservoir-type hydropower station in the middle and lower reaches of the Lancang River Basin in Yunnan Province, China as an example, denoted as P1, we study how to use the run-of-river hydropower stations around P1 to restore its historical runoff. According to the geographical distribution, there are 12 run-of-river hydropower stations within a range of about 60km around it. Assuming that P1 and the surrounding 12 run-of-river hydropower stations have no historical runoff data, the known data are the output data (hourly scale) of P1 and its surrounding run-of-river hydropower stations from May 2012 to July 2015. How to restore the historical runoff data of the reservoir-type hydropower station based on a very small amount of known data is the key issue of the present invention.

[0118] The practical method proposed in this application is used to restore the historical runoff data of the storage capacity power station at the corresponding time, and the restored runoff is compared and analyzed with the actual runoff, in order to verify the rationality of the practical method proposed in this application.

[0119] The correlation results between the daily power generation of P1 and the daily power generation of its surrounding run-of-river hydropower stations are shown in Table 1.

[0120] Table 1: Correlation between daily power generation and daily power generation of surrounding run-of-river hydropower stations

[0121]

[0122] The normalized water inflow process of S5 and S7 and the average value of the normalized water inflow process of S5 and S7 are selected as the water inflow reference of the reservoir-type hydropower station, and the practical method proposed by the present invention is used to restore the historical runoff process of P1 under three different water inflow references. In order to avoid the restoration period being too short (such as taking the day as the restoration period), the random selection of the water level at the end of the restoration period seriously affects the runoff restoration result, the season is selected as the restoration period, and the starting water level and the ending water level of P1 are the same within a given season. Figure 7 FIG. 1 is a schematic diagram of error analysis of historical runoff restoration results of a storage capacity power station under different runoff references according to an exemplary embodiment. The root mean square error and mean absolute percentage error are selected as evaluation indicators to evaluate the error between the restored runoff and the actual runoff. The evaluation results are shown in FIG. Figure 7 As the actual historical runoff data from 2013.5 to 2013.7 is missing, the restoration results within this time range were not analyzed.

[0123] ① From the error results of a single restoration cycle, in spring and winter, the root mean square error and average absolute percentage error of the runoff restoration results under three different runoff references are small and very similar. In summer and autumn, the root mean square error and average absolute percentage error of the runoff restoration results with S5 and S7 as reference are large, while the root mean square error and average absolute percentage error are significantly lower when the average runoff of S5 and S7 is used as a reference. ② From the overall restoration results, the root mean square error and average absolute percentage error with the average runoff of S5 and S7 as a reference are significantly smaller. Therefore, selecting the average value of the normalized inflow process of S5 and S7 as the inflow reference of P1 can avoid the situation where the representativeness of a single power station is too low, resulting in a large deviation between the restoration results and the actual value.

[0124] Figure 8 is a schematic diagram showing the comparison between the historical runoff sequence of a storage capacity power station and the restored runoff sequence under three different runoff references according to an exemplary embodiment. The historical runoff restoration results of P1 under the three conditions are shown in FIG. Figure 8 This is consistent with the above error analysis results, especially in summer and autumn ( Figure 8 The restored result obtained by taking the average value of the normalized water inflow process of S5 and S7 as the water inflow reference of P1 is closer to the actual observed value, and the overall result is more impressive.

[0125] Therefore, the principle of this application is simple, easy to implement and highly stable. The historical runoff process of the reservoir-type hydropower station can be restored based only on the historical output data of each power station in the cascade hydropower station group in the data-poor area, and the restoration result has high reliability and authenticity, which lays a high-quality data foundation for the subsequent research on the reservoir-type hydropower station.

[0126] The principle of this application is: first, analyze the relationship between the reservoir-type hydropower station and the runoff-type hydropower station in the cascade hydropower station group; secondly, use the output calculation formula to calculate the runoff process of the runoff-type hydropower station, and obtain the runoff trend reference of the reservoir-type hydropower station; finally, use the same multiple magnification method, dichotomy method and electricity-determined water method to restore the historical runoff process of the reservoir-type hydropower station. In view of the loss of historical hydrological data of hydropower station groups in remote and backward areas of my country, the owners of hydropower stations have no confidence in optimizing and adjusting the operation of hydropower stations. This invention can restore the historical runoff process of each reservoir-type hydropower station based only on the available historical power sequence data of the hydropower station, and the restoration result has high reliability and authenticity, which lays a high-quality data foundation for further research on the optimized operation of reservoir-type hydropower stations.

[0127] In summary, the embodiment of the application provides a method for restoring historical runoff data of a hydropower station group, by obtaining a runoff hydropower station reference of a reservoir-type hydropower station according to the runoff similarity between the runoff hydropower station and the reservoir-type hydropower station in the hydropower station group. According to the hydraulic characteristics of the runoff hydropower station, the runoff process of the runoff hydropower station reference is obtained, and based on the runoff process, the runoff trend is obtained, and the runoff trend is used as the runoff trend reference of the reservoir-type hydropower station. The runoff trend reference is enlarged by the same multiple ratio, and the water level process in the cycle of the enlarged runoff trend reference is restored. According to the relationship between the end water level of the cycle in the water level process and the preset end water level of the cycle, the runoff process of the reservoir-type hydropower station is determined by adjusting the same multiple ratio of the runoff trend reference, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station. This application can restore the historical runoff sequence of the reservoir-type hydropower station only based on the historical output sequence of each power station in the cascade hydropower station group when the historical data of the hydropower station is very scarce, laying a high-quality data foundation for the cascade hydropower station group in the data-poor area to evaluate the dispatching benefits of the hydropower station through simulated dispatching. The invention solves the problem of low accuracy in restoring historical runoff data of a hydropower station group in the related technology and improves the accuracy of restoring historical runoff data.

[0128] In a second aspect, an embodiment of the present application provides a system for restoring historical runoff data of a hydropower station group. Fig. 9 FIG. 1 is a block diagram of a system for restoring historical runoff data of a hydropower station group according to an exemplary embodiment. Fig. 9 As shown, the system includes a runoff hydropower station reference module 910, a runoff trend reference module 920 and a hydropower station historical runoff data restoration module 930, wherein:

[0129] A run-of-river hydropower station reference module 910 is used to obtain a run-of-river hydropower station reference of a reservoir-type hydropower station according to the runoff similarity between the run-of-river hydropower station and the reservoir-type hydropower station in the hydropower station group;

[0130] A runoff trend reference module 920 is used to obtain a runoff process for reference of a runoff hydropower station according to the hydraulic characteristics of the runoff hydropower station, obtain a runoff trend based on the runoff process, and use the runoff trend as a runoff trend reference for a reservoir-type hydropower station;

[0131] The module 930 for restoring the historical runoff data of the hydropower station is used to expand the runoff trend with reference to the same multiple ratio, and restore the water level process within the cycle with reference to the expanded runoff trend. According to the relationship between the end-of-cycle water level in the water level process within the cycle and the preset end-of-cycle water level, the runoff process of the reservoir-type hydropower station is determined by adjusting the runoff trend with reference to the same multiple ratio, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station.

[0132] In summary, the present application provides a system for restoring historical runoff data of a hydropower station group, which solves the problem of low accuracy in restoring historical runoff data of a hydropower station group in the related art through a runoff hydropower station reference module 910, a runoff trend reference module 920 and a module 930 for restoring historical runoff data of a hydropower station. Specifically, a runoff hydropower station reference of a reservoir-type hydropower station is obtained according to the runoff similarity between the runoff hydropower station and the reservoir-type hydropower station in the hydropower station group. According to the hydraulic characteristics of the runoff hydropower station, a runoff process of a runoff hydropower station reference is obtained, and based on the runoff process, a runoff trend is obtained, and the runoff trend is used as a runoff trend reference of the reservoir-type hydropower station. The runoff trend reference is enlarged by the same multiple ratio, and the water level process in the cycle of the enlarged runoff trend reference is restored. According to the relationship between the end water level of the cycle in the water level process and the preset end water level of the cycle, the runoff process of the reservoir-type hydropower station is determined by adjusting the same multiple ratio of the runoff trend reference, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station. This application can restore the historical runoff sequence of a reservoir-type hydropower station based only on the historical output sequence of each power station in the cascade hydropower station group when the historical data of the hydropower station are very scarce, laying a high-quality data foundation for evaluating the dispatching benefits of the cascade hydropower station group through simulated dispatching in areas with scarce data. It solves the problem of low accuracy in restoring the historical runoff data of the hydropower station group in the related technology, and improves the accuracy of restoring the historical runoff data.

[0133] It should be noted that the system for restoring historical runoff data of a hydropower station group provided in this embodiment is used to implement the above-mentioned implementation mode, and the descriptions that have been made will not be repeated. As used above, the terms "module", "unit", "subunit", etc. can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the above embodiment is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0134] In a third aspect, an embodiment of the present application provides an electronic device, Fig.10 FIG. 1 is a block diagram of an electronic device according to an exemplary embodiment. Fig.10 As shown, the electronic device may include a processor 1001 and a memory 1002 storing computer program instructions.

[0135] Specifically, the processor 1001 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0136] Among them, the memory 1002 may include a large capacity memory for data or instructions. For example, but not limitation, the memory 1002 may include a hard disk drive (HDD), a floppy disk drive, a solid state drive (SSD), a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 1002 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 1002 may be inside or outside the data processing device. In a specific embodiment, the memory 1002 is a non-volatile memory. In a specific embodiment, the memory 1002 includes a read-only memory (ROM) and a random access memory (RAM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (Programmable Read-Only Memory, PROM for short), an erasable PROM (ErasableProgrammable Read-Only Memory, EPROM for short), an electrically erasable PROM (Electrically ErasableProgrammable Read-Only Memory, EEPROM for short), an electrically alterable ROM (ElectricallyAlterable Read-Only Memory, EAROM for short) or a flash memory (FLASH) or a combination of two or more of these. Under appropriate circumstances, the RAM can be a static random access memory (SRAM) or a dynamic random access memory (DRAM), wherein the DRAM can be a fast page mode dynamic random access memory (FPMDRAM), an extended data output dynamic random access memory (EDODRAM), a synchronous dynamic random access memory (SDRAM), etc.

[0137] The memory 1002 may be used to store or cache various data files that need to be processed and / or used for communication, as well as possible computer program instructions executed by the processor 1001 .

[0138] The processor 1001 reads and executes the computer program instructions stored in the memory 1002 to implement any one of the methods for restoring historical runoff data of a hydropower station group in the above embodiments.

[0139] In one embodiment, a device for restoring historical runoff data of a hydropower station group may further include a communication interface 1003 and a bus 1000. Fig.10 As shown, the processor 1001, the memory 1002, and the communication interface 1003 are connected via a bus 1000 and communicate with each other.

[0140] The communication interface 1003 is used to implement communication between the modules, devices, units and / or equipment in the embodiment of the present application. The communication port 1003 can also implement data communication with other components such as: external devices, image / data acquisition equipment, databases, external storage, and image / data processing workstations.

[0141] The bus 1000 includes hardware, software or both, and couples the components of a device for restoring historical runoff data of a hydropower station group to each other. The bus 1000 includes but is not limited to at least one of the following: a data bus, an address bus, a control bus, an expansion bus, and a local bus. By way of example and not limitation, bus 1000 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses or a combination of two or more of these. Where appropriate, bus 1000 may include one or more buses. Although embodiments of the present application describe and illustrate a particular bus, the present application contemplates any suitable bus or interconnect.

[0142] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a program stored thereon, and when the program is executed by a processor, a method for restoring historical runoff data of a hydropower station group provided in the first aspect is implemented.

[0143] The readable storage medium may include but is not limited to: a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device or any suitable combination of the above.

[0144] In a possible implementation, the present invention can also be implemented in the form of a program product, which includes program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps of a method for restoring historical runoff data of a hydropower station group provided in the first aspect.

[0145] Among them, the program code for executing the present invention can be written in any combination of one or more programming languages, and the program code can be executed completely on the user device, partially on the user device, as an independent software package, partially on the user device and partially on a remote device, or completely on the remote device.

[0146] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0147] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for restoring historical runoff data of a hydropower station group, characterized in that: The method comprises: According to the runoff similarity between the runoff type hydropower station and the reservoir type hydropower station in the hydropower station group, obtaining the runoff type hydropower station reference of the reservoir type hydropower station; According to the hydraulic characteristics of the runoff hydropower station, a runoff process for reference of the runoff hydropower station is obtained, based on the runoff process, a runoff trend is obtained, and the runoff trend is used as a reference for the runoff trend of the reservoir-type hydropower station; The runoff trend is enlarged with reference to the same multiple ratio, and the water level process within the period to which the enlarged runoff trend refers is restored. According to the relationship between the end-of-period water level in the water level process within the period and the preset end-of-period water level, the runoff process of the reservoir-type hydropower station is determined by adjusting the runoff trend with reference to the same multiple ratio, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station.

2. The method according to claim 1, characterized in that The runoff trend is enlarged by referring to the same multiple ratio, and the water level process in the cycle referred to by the enlarged runoff trend is restored; according to the relationship between the end water level of the cycle in the water level process and the preset end water level of the cycle, the runoff process of the reservoir-type hydropower station is determined by adjusting the runoff trend reference same multiple ratio, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station, including: According to a preset multiple ratio value, the runoff trend reference of the reservoir-type hydropower station is expanded to match the actual operation demand of the reservoir-type hydropower station; Obtain the water level change process of the runoff trend reference after expansion through the daily power generation flow, and determine the water level process within the cycle of the runoff trend reference after expansion based on the water level change process of the runoff trend reference, wherein the water level process within the cycle includes the water level at the end of the cycle; The difference between the water level at the end of the period and the water level at the end of the preset period is compared. When the difference is less than or equal to the preset value, the runoff process of the reservoir-capacity hydropower station is determined; when the difference is greater than the preset value, the runoff process of the reservoir-capacity hydropower station is determined by dichotomy and adjusting the runoff trend reference multiple ratio value until the difference is less than or equal to the preset value, and the runoff process of the reservoir-capacity hydropower station is used as the historical runoff restoration data of the hydropower station.

3. The method according to claim 2, characterized in that Before expanding the runoff trend reference of the reservoir-type hydropower station according to the preset multiple ratio value, the method further includes: Define the current reservoir-type hydropower station and determine the specific identification of the current reservoir-type hydropower station; Defining the total number of reduction cycle periods and the current period, determining the specific moment in the sequence between the reservoir capacity hydropower stations and the entire calculation cycle; Define the final water level of the restoration period, the preset starting water level and the preset final water level of the restoration period, and obtain the design flood flow of the dam site of the current reservoir-type hydropower station; The initial power generation flow rate of the current calculation period is determined according to the maximum value and the minimum value of the power generation flow rate of the current reservoir-type hydropower station.

4. The method according to claim 3, characterized in that The process of obtaining the water level change of the runoff trend reference after expansion through the daily power generation flow includes: According to the daily power generation, the output of the current period is obtained; Compare the difference between the output of the current period and the actual output, and when the output difference is less than the preset output difference, obtain the water level change process of the runoff trend reference after expansion; when the output difference is greater than or equal to the preset output difference, adjust the power generation flow; wherein adjusting the power generation flow includes: If the calculated output is greater than the actual output plus the allowable error range, the binary search method is used to find the value of the next power generation flow; If the calculated output is less than the actual output minus the allowable error range, the binary search method is used to find the value of the next power generation flow.

5. The method according to claim 1, characterized in that: The step of obtaining a run-of-river hydropower station reference of the reservoir-type hydropower station according to the runoff similarity between the run-of-river hydropower station and the reservoir-type hydropower station in the hydropower station group includes: According to the relationship between the output of a hydropower station and the water inflow of the hydropower station, the runoff similarity between the run-of-river hydropower stations and the reservoir-type hydropower stations in the hydropower station group is obtained by analyzing the correlation between the output of different run-of-river hydropower stations and the output of the reservoir-type hydropower stations in the same area; According to the strength of the runoff similarity, a runoff hydropower station with strong runoff similarity is obtained as a runoff hydropower station reference of the reservoir-type hydropower station.

6. The method according to claim 5, characterized in that Analyze the correlation between the output of different run-of-river hydropower stations and the output of reservoir-type hydropower stations in the same region, including: By calculating the Pearson correlation coefficient between the daily power generation of different run-of-river hydropower stations and reservoir-type hydropower stations in the same area, the correlation between the daily power generation of the run-of-river hydropower station and the reservoir-type hydropower station is obtained, and the correlation of the daily power generation is used as the strength of the correlation between the output of the run-of-river hydropower station and the output of the reservoir-type hydropower station.

7. The method according to claim 1, characterized in that The method of obtaining a runoff process for reference of the runoff hydropower station according to the hydraulic characteristics of the runoff hydropower station, obtaining a runoff trend based on the runoff process, and using the runoff trend as a reference for the runoff trend of the reservoir-type hydropower station includes: According to the characteristic that the run-of-river hydropower station does not have an adjustable storage capacity, information is obtained that the output of the run-of-river hydropower station is determined by the incoming water, and the run-of-river water head is taken as a fixed value; Based on the output of the run-of-river hydropower station and the water head of the run-of-river hydropower station, the runoff process referenced by the run-of-river hydropower station is calculated by an output calculation formula; Based on the runoff process of the runoff hydropower station as a reference, the runoff trend is obtained by normalizing the trend of the runoff process, and the runoff trend is used as a reference for the runoff trend of the reservoir-type hydropower station.

8. A system for restoring historical runoff data of a hydropower station group, characterized in that: The system includes a runoff hydropower station reference module, a runoff trend reference module and a module for restoring the historical runoff data of the hydropower station, wherein: The run-of-river hydropower station reference module is used to obtain a run-of-river hydropower station reference of the reservoir-type hydropower station according to the runoff similarity between the run-of-river hydropower station and the reservoir-type hydropower station in the hydropower station group; The runoff trend reference module is used to obtain the runoff process of the runoff hydropower station according to the hydraulic characteristics of the runoff hydropower station, obtain the runoff trend based on the runoff process, and use the runoff trend as the runoff trend reference of the reservoir hydropower station; The module for restoring the historical runoff data of the hydropower station is used to expand the runoff trend with reference to the same multiple ratio, and restore the water level process within the cycle referenced by the expanded runoff trend. According to the relationship between the end-of-cycle water level in the water level process within the cycle and the preset end-of-cycle water level, the runoff process of the reservoir-type hydropower station is determined by adjusting the runoff trend with reference to the same multiple ratio, and the runoff process of the reservoir-type hydropower station is used as the historical runoff restoration data of the hydropower station.

9. An electronic device, characterized in that: The method comprises a memory and a processor, a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, a method for restoring historical runoff data of a hydropower station group as claimed in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, a method for restoring historical runoff data of a hydropower station group is implemented as described in any one of claims 1 to 7.

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