A method and system for dispatching flood control gates of power stations based on water diversion inflow forecast

Abstract

The invention discloses a method and system for dispatching flood gates of a power station based on water diversion inflow prediction, comprising the following steps: S1, determining the position and specification information of each flood gate, and numbering each flood gate; S2, estimating the water inflow information of the hydropower station basin based on meteorological data in a selected time period, collecting image data of the river surface, and calculating the water flow line information within a specified distance range of the hydropower station dam; S3, determining the flow velocity data of the corresponding river section; S4, accumulating the sediment deposition effect within a specified time range within a specified distance range of the hydropower station dam; S5, associating the determined sediment deposition effect within the specified distance range of the hydropower station dam with the position of each flood gate; S6, dispatching the flood gate; the invention can avoid the long-term deposition and accumulation of sediment, improve the overall operation safety and reliability of the hydropower station, and can provide an effective reference and guidance for the dispatching of flood gates of the hydropower station.

Description

Technical Field

[0001] The invention relates to the technical field of hydropower station dispatching, and in particular to a method and system for dispatching flood control gates of a power station based on water diversion inflow prediction. Background Art

[0002] Hydropower stations are very important water conservancy facilities, taking into account multiple benefits such as flood control, power generation, shipping, and ecology, and generating significant economic and social value. The control and management of hydropower stations is quite complex and difficult. Especially during the flood season, in some scenarios, hydropower stations have many different types of discharge units (gates), and the opening conditions of different gates are complex and changeable, requiring high linkage response speed.

[0003] The complexity considered in manual calculations is limited, and it is difficult to cope with changing natural conditions, especially during the flood season when the sediment content in the basin is high. If a gate is not opened for a long time, sediment will accumulate within the range of the gate. In the long run, it will affect the safe operation of the hydropower station.

[0004] Therefore, the existing gate scheduling method obtained based on operating experience is difficult to obtain the optimal gate scheduling solution. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a method and system for dispatching flood control gates of power stations based on water diversion inflow forecasting, which provides effective reference and guidance for dispatching flood control gates of hydropower stations and improves the safety and reliability of hydropower station operation.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for dispatching flood control gates of power stations based on water diversion inflow forecast, comprising the following steps:

[0007] S1. Determine the location and specification information of each flood control gate according to the dam structure of the hydropower station, and number each flood control gate;

[0008] S2. In a selected time period, the water inflow information of the hydropower station basin is estimated based on the meteorological data, and the image data of the river surface is collected, and the water flow line information within a specified distance range of the hydropower station dam is calculated based on the collected image data;

[0009] S3, determining the flow velocity data of the corresponding river section according to the calculated water flow line information within the specified distance range;

[0010] S4. within a specified distance range of the hydropower station dam, based on the flow velocity data and water inflow information of the determined river section, accumulating the sediment deposition effect within a specified time range, wherein the specified time range includes a plurality of selected time periods;

[0011] S5, positionally correlating the determined sediment deposition effect within a specified distance range of the hydropower station dam with the positions of each flood control gate;

[0012] S6. Dispatching the flood control gate based on the determined correlation between the sediment deposition effect and the position of the flood control gate, the currently required overall gate opening data, and the specification information of the flood control gate.

[0013] Furthermore, the water flow line information within a specified distance range from the hydropower station dam is calculated according to the collected image data in step S2, including:

[0014] Determine the time interval for collecting image data of the river water surface as Δt;

[0015] A coordinate system is established based on two frames of river water surface image data collected, and image pairing is performed, wherein the image pairing is achieved based on the similarity of any two pixel regions between the previous frame image and the next frame image;

[0016] Based on the result of the image pairing, determining the pixel distance between two paired pixel areas of the river water surface within the time interval Δt as the corresponding water flow line;

[0017] The velocity of the corresponding water flow lines in two pixel areas is calculated based on the pixel distance to meet the following requirements:

[0018]

[0019]

[0020] in, represents the water flow velocity along the x direction in the coordinate system, It represents the water flow velocity along the y direction in the coordinate system, x(t) and y(t) are the positions of the two paired pixel areas in the pixel area of ​​the previous frame, and x(t+Δt) and y(t+Δt) are the positions of the two paired pixel areas in the pixel area of ​​the next frame.

[0021] Furthermore, a coordinate system is established based on the two frames of river water surface image data collected, and image pairing is performed including:

[0022] In the image data of the river surface in the previous frame, particle n is selected as the center, and the query area N is determined in the previous frame image with a specified radius;

[0023] In the next frame of image, a candidate particle m is selected, and a query area M is determined in the next frame of image with the specified radius;

[0024] Calculate the similarity between particle n and particle m, satisfying:

[0025]

[0026] Among them, sim nm is the similarity between particle n and particle m, G() is a first-order step function, γ f , γ θ are the thresholds of distance deviation and angle deviation, r nk ,θ nk are the distance and line angle between particle n and query area N, r ml ,θ ml are the distance and the angle between the candidate particle m and the query area M, respectively. K and L are the number of particles in the query area N and the query area M, respectively.

[0027] Furthermore, in step S4, within a specified distance range of the hydropower station dam, based on the determined flow velocity data of the river section and the water inflow information, accumulating the sediment deposition effect within a specified time range includes:

[0028] Calculate the average flow velocity based on the flow velocity data of the determined river section

[0029] Based on the flow segment Q corresponding to the water volume information i And the average flow rate Determine the duration of the flow segment t i ;

[0030] Within a specified time frame, based on the duration of each flow segment and the location of the flood control gates, the cumulative sediment deposition effect satisfies:

[0031]

[0032] Among them, Se represents the accumulated sediment deposition within the specified time range and the range of the flood control gate, γ represents the length ratio of the flood control gate position to the river bank section, T represents the flow section number of the inflow, ω represents the sediment settling velocity, S v represents the volume percentage of sediment content, d represents the average particle size of suspended sediment, and t i Indicates the duration of traffic segment i.

[0033] Furthermore, in step S5, the determined sediment deposition effect within the specified distance range of the hydropower station dam is associated with the position of each flood control gate, including:

[0034] Obtaining historical opening data of each flood gate and determining the amount of sediment loss within each flood gate range, wherein the amount of sediment loss within any flood gate range is determined based on a fixed loss rate after the gate is opened and the historical opening time of the flood gate;

[0035] The amount of sediment left in each flood gate range is determined based on the accumulated sediment deposition in the flood gate range and the sediment loss in each flood gate range.

[0036] Furthermore, in step S6, scheduling the flood gate based on the determined correlation between the sediment deposition effect and the position of the flood gate, the currently required overall gate opening data, and the specification information of the flood gate includes:

[0037] The flood control gates are ranked according to the amount of sediment residue in their range, and the flood control gates with the largest amount of sediment residue in their range are dispatched first based on the currently required overall gate opening data.

[0038] Furthermore, based on the determined correlation between the sediment deposition effect and the position of the flood control gate, the currently required overall gate opening data and the specification information of the flood control gate, the scheduling of the flood control gate also includes:

[0039] When the currently required overall gate opening is greater than the first preset height threshold of the opened flood control gate, the flood control gates with the largest amount of sediment residue in the range are opened sequentially according to the amount of sediment residue in the range of each flood control gate, wherein the first preset height threshold of the opened flood control gate is determined based on the specification information of the corresponding flood control gate.

[0040] In addition, the present invention also discloses a power station flood control gate scheduling system based on water diversion inflow prediction, including a processor and a memory, wherein a computer program is stored on the memory, and when the computer program is executed by the processor, the steps of the power station flood control gate scheduling method based on water diversion inflow prediction are implemented.

[0041] Beneficial effects of the present invention: The present invention determines each streamline data based on the collected river water surface image data, and judges the comprehensive average flow velocity in combination with the streamline data, so as to determine the sediment accumulation in the hydropower station basin, especially the hydropower station dam during the flood season according to the predicted water inflow, and executes the scheduling of flood control gates according to the amount of sediment deposition, so that at least part of the sediment can be discharged into the downstream basin during the scheduling of the flood control gate, avoiding the long-term deposition and accumulation of sediment, improving the overall operation safety and reliability of the hydropower station, and can provide effective reference and guidance for the scheduling of flood control gates of hydropower stations; in addition, the present invention can provide a basis and reference for the scientific scheduling of flood control gates of hydropower stations for hydropower stations that have been operating in sediment-rich basins for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The figure is a flow chart of a method for dispatching flood control gates of power stations based on water diversion inflow forecast. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Example 1: In general, the main function of the flood control gates of a hydropower station is to perform scheduling when the water volume exceeds the standard during the flood season, thereby releasing part of the flow to the downstream. During operation, the flood control gates are closed most of the time, which provides the basic conditions for the accumulation of sediment. Long-term accumulation of sediment will raise the riverbed, erode the turbine inlet, and affect the safe operation of the hydropower station. Figure 1 As shown, this embodiment provides a method for dispatching flood control gates of a power station based on water diversion inflow forecasting, comprising the following steps:

[0045] S1. According to the structure of the hydropower station dam, determine the location and specification information of each flood control gate, and number each flood control gate; in some examples, the dam structure can be measured or modeled to obtain accurate location and specification information of each flood control gate. In some application scenarios, the specifications of the flood control gates of the same dam are generally unified, and there are also cases with different specifications, which are determined according to the actual scenario. The numbering of flood control gates can be based on the distance from the generator inlet or the distance from the shore as a reference.

[0046] S2. In a selected time period, the water flow information of the hydropower station basin is estimated based on meteorological data, and image data of the river surface is collected, and the water flow line information within a specified distance range of the hydropower station dam is calculated based on the collected image data; in this embodiment, the water flow information of the hydropower station basin estimated based on meteorological data can be obtained by curve fitting or comparative matching based on relevant water flow data and weather data of historical periods. The water flow line information within a specified distance range of the hydropower station dam calculated based on the collected image data can be determined based on the angle of similarity of the image, and the water flow line information within the Δt time range can be determined.

[0047] S3, determining the flow velocity data of the corresponding river section according to the calculated water flow line information within the specified distance range;

[0048] S4. within a specified distance range of the hydropower station dam, based on the flow velocity data and water inflow information of the determined river section, accumulating the sediment deposition effect within a specified time range, wherein the specified time range includes a plurality of selected time periods;

[0049] S5, positionally correlating the determined sediment deposition effect within a specified distance range of the hydropower station dam with the positions of each flood control gate;

[0050] S6. Dispatching the flood control gate based on the determined correlation between the sediment deposition effect and the position of the flood control gate, the currently required overall gate opening data, and the specification information of the flood control gate.

[0051] In the above technical solution, the specified time range can be the operation of the dam to date, and the selected time period can be the current month or week of operation. In specific operation, the sediment content in the water flow can be determined based on historical data of the flood season, and statistical calculations can be performed on the time period when the sediment content exceeds a given threshold, while the dry season is not included in the calculation.

[0052] Furthermore, the water flow line information within a specified distance range from the hydropower station dam is calculated according to the collected image data in step S2, including:

[0053] The time interval for collecting image data of the river surface is determined to be Δt; in some examples, the camera equipment on the hydropower station dam can be directly reused to collect image data of the river surface at different times and the same angle, and the time interval is determined according to the collection time. It is also possible to directly record a video of the river surface and select images with a time interval of Δt for subsequent processing.

[0054] A coordinate system is established based on two frames of collected image data of the river water surface, and image matching is performed, wherein the image matching is achieved based on the similarity between any two pixel areas between the previous frame image and the next frame image; for example, the similarity between a certain area of ​​the previous frame image and the next frame image is higher than a preset similarity threshold.

[0055] Based on the result of the image pairing, determining the pixel distance between two paired pixel areas of the river water surface within the time interval Δt as the corresponding water flow line;

[0056] The velocity of the corresponding water flow lines in two pixel areas is calculated based on the pixel distance to meet the following requirements:

[0057]

[0058]

[0059] in, represents the water flow velocity along the x direction in the coordinate system, It represents the water flow velocity along the y direction in the coordinate system, x(t) and y(t) are the positions of the two paired pixel areas in the pixel area of ​​the previous frame, and x(t+Δt) and y(t+Δt) are the positions of the two paired pixel areas in the pixel area of ​​the next frame.

[0060] Furthermore, a coordinate system is established based on the two frames of river water surface image data collected, and image pairing is performed including:

[0061] In the image data of the river surface in the previous frame, particle n is selected as the center, and a query area N is determined in the previous frame image with a specified radius; the query area can also be determined in other ways, such as a square with n as the center.

[0062] In the next frame of image, a candidate particle m is selected, and a query area M is determined in the next frame of image with the specified radius;

[0063] Calculate the similarity between particle n and particle m, satisfying:

[0064]

[0065] Among them, sim nm is the similarity between particle n and particle m, G() is a first-order step function, γ f , γ θ are the thresholds of distance deviation and angle deviation, r nk ,θ nk are the distance and line angle between particle n and query area N, r ml ,θ ml are the distance and the angle between the candidate particle m and the query area M, respectively. K and L are the number of particles in the query area N and the query area M, respectively.

[0066] Finally, the calculated similarities are sorted, and the query area with the highest similarity in the subsequent frame is selected as the matching area of ​​the query area in the previous frame.

[0067] Furthermore, in step S4, within a specified distance range of the hydropower station dam, based on the determined flow velocity data of the river section and the water inflow information, accumulating the sediment deposition effect within a specified time range includes:

[0068] Calculate the average flow velocity based on the flow velocity data of the determined river section

[0069] Based on the flow segment Q corresponding to the water volume information i And the average flow rate Determine the duration of the flow segment t i In some examples, the incoming water flow can be divided into multiple flow segments according to the change of flow rate, and the average flow rate can be used to calculate the flow rate. Determine the corresponding duration t i .

[0070] Within a specified time frame, based on the duration of each flow segment and the location of the flood control gates, the cumulative sediment deposition effect satisfies:

[0071]

[0072] Among them, Se represents the accumulated sediment deposition within the specified time range and the range of the flood control gate, γ represents the length ratio of the flood control gate position to the river bank section, T represents the flow section number of the inflow, ω represents the sediment settling velocity, S v represents the volume percentage of sediment content, d represents the average particle size of suspended sediment, and t i Indicates the duration of traffic segment i.

[0073] Furthermore, in step S5, the determined sediment deposition effect within the specified distance range of the hydropower station dam is associated with the position of each flood control gate, including:

[0074] The historical opening data of each flood control gate is obtained, and the amount of sediment loss within the range of each flood control gate is determined, wherein the amount of sediment loss within the range of any flood control gate is determined based on the fixed loss rate after the gate is opened and the historical opening time of the flood control gate; in specific applications, the aforementioned sediment accumulation can be fully accumulated according to the flow segment, and the amount of sediment loss within the opening time can be further calculated based on the opening data of the relevant flood control gate. The fixed loss rate can be simulated and calculated, or it can be comprehensively determined by the sediment data before and after the gate is opened and the opening time. In the embodiment of the present application, the sediment loss rate after the gate is opened to the first preset height is regarded as the same, that is, the loss of the deposited sediment at the riverbed is mainly considered, and the sediment that has not yet been deposited is not considered.

[0075] The amount of sediment left in each flood gate range is determined based on the accumulated sediment deposition in the flood gate range and the sediment loss in each flood gate range.

[0076] Furthermore, in step S6, scheduling the flood gate based on the determined correlation between the sediment deposition effect and the position of the flood gate, the currently required overall gate opening data, and the specification information of the flood gate includes:

[0077] According to the amount of sediment left in the range of each flood gate, the flood gates are sorted, and the flood gates with the largest amount of sediment left in the range are dispatched first according to the current required overall gate opening data. For example, if only one flood gate needs to be opened according to the current required overall gate opening, the flood gate with the largest amount of sediment left in the affected range will be opened.

[0078] Furthermore, based on the determined correlation between the sediment deposition effect and the position of the flood control gate, the currently required overall gate opening data and the specification information of the flood control gate, the scheduling of the flood control gate also includes:

[0079] When the current required overall gate opening is greater than the first preset height threshold of the opened flood control gate, the flood control gates with the largest amount of sediment in the range are opened in sequence according to the amount of sediment left in the range of each flood control gate, wherein the first preset height threshold of the opened flood control gate is determined based on the specification information of the corresponding flood control gate. The first preset height threshold can be determined based on the specifications of the flood control gate and the gate stress after the discharge of a single gate exceeds a certain threshold is less than a specified stress threshold.

[0080] In addition, the present invention also discloses a power station flood control gate scheduling system based on water diversion inflow prediction, including a processor and a memory, wherein a computer program is stored on the memory, and when the computer program is executed by the processor, the steps of the power station flood control gate scheduling method based on water diversion inflow prediction are implemented.

[0081] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A method for dispatching flood control gates of a power station based on water diversion inflow forecasting, characterized in that: The following steps are involved: S1. Determine the location and specification information of each flood control gate according to the dam structure of the hydropower station, and number each flood control gate; S2. In a selected time period, the water inflow information of the hydropower station basin is estimated based on the meteorological data, and the image data of the river surface is collected, and the water flow line information within a specified distance range of the hydropower station dam is calculated based on the collected image data; S3, determining the flow velocity data of the corresponding river section according to the calculated water flow line information within the specified distance range; S4. within a specified distance range of the hydropower station dam, based on the flow velocity data and water inflow information of the determined river section, accumulating the sediment deposition effect within a specified time range, wherein the specified time range includes a plurality of selected time periods; S5, positionally correlating the determined sediment deposition effect within a specified distance range of the hydropower station dam with the positions of each flood control gate; S6. Dispatching the flood control gate based on the determined correlation between the sediment deposition effect and the position of the flood control gate, the currently required overall gate opening data, and the specification information of the flood control gate; The step S2 in which the water flow line information within a specified distance range from the hydropower station dam is calculated based on the collected image data includes: Determine the time interval for collecting image data of the river water surface as Δt; A coordinate system is established based on two frames of river water surface image data collected, and image pairing is performed, wherein the image pairing is achieved based on the similarity of any two pixel regions between the previous frame image and the next frame image; Based on the result of the image pairing, determining the pixel distance between two paired pixel areas of the river water surface within the time interval Δt as the corresponding water flow line; The velocity of the corresponding water flow lines in two pixel areas is calculated based on the pixel distance to meet the following requirements: in, represents the water flow velocity along the x direction in the coordinate system, It represents the water flow velocity along the y direction in the coordinate system, x(t) and y(t) are the positions of the two paired pixel areas in the pixel area of ​​the previous frame, and x(t+Δt) and y(t+Δt) are the positions of the two paired pixel areas in the pixel area of ​​the next frame.

2. A method for dispatching flood control gates of power stations based on water diversion inflow forecasting according to claim 1, characterized in that: The coordinate system is established based on the two frames of river water surface image data collected, and the image pairing includes: In the image data of the river water surface in the previous frame, particle n is selected as the center, and the query area N is determined in the previous frame image with a specified radius; In the next frame of image, a candidate particle m is selected, and a query area M is determined in the next frame of image with the specified radius; Calculate the similarity between particle n and particle m, satisfying: Among them, sim nm is the similarity between particle n and particle m, G() is a first-order step function, γ f , γ θ are the thresholds of distance deviation and angle deviation, r nk ,θ nk are the distance and line angle between particle n and query area N, r ml ,θ ml are the distance and the angle between the candidate particle m and the query area M, respectively. K and L are the number of particles in the query area N and the query area M, respectively.

3. A method for dispatching flood control gates of power stations based on water diversion inflow forecasting according to claim 1, characterized in that: In the step S4, within the specified distance range of the hydropower station dam, based on the determined flow velocity data of the river section and the water inflow information, accumulating the sediment deposition effect within the specified time range includes: Calculate the average flow velocity based on the flow velocity data of the determined river section Based on the flow segment Q corresponding to the water flow information i And the average flow rate Determine the duration of the flow segment t i ; Within a specified time frame, based on the duration of each flow segment and the location of the flood control gates, the cumulative sediment deposition effect satisfies: Among them, Se represents the accumulated sediment deposition within the specified time range and the range of the flood control gate, γ represents the length ratio of the flood control gate position to the river bank section, T represents the flow section number of the inflow, ω represents the sediment settling velocity, S v represents the volume percentage of sediment content, d represents the average particle size of suspended sediment, and t i Indicates the duration of traffic segment i.

4. A method for dispatching flood control gates of power stations based on water diversion inflow forecasting according to claim 1, characterized in that: In step S5, the determined sediment deposition effect within the specified distance range of the hydropower station dam is associated with the position of each flood control gate, including: Obtaining historical opening data of each flood gate and determining the amount of sediment loss within each flood gate range, wherein the amount of sediment loss within any flood gate range is determined based on a fixed loss rate after the gate is opened and the historical opening time of the flood gate; The amount of sediment left in each flood gate range is determined based on the accumulated sediment deposition in the flood gate range and the sediment loss in each flood gate range.

5. A method for dispatching flood control gates of power stations based on water diversion inflow forecasting according to claim 1, characterized in that: In step S6, scheduling the flood gate based on the determined correlation between the sediment deposition effect and the position of the flood gate, the currently required overall gate opening data, and the specification information of the flood gate includes: The flood control gates are ranked according to the amount of sediment residue in their range, and the flood control gates with the largest amount of sediment residue in their range are dispatched first based on the currently required overall gate opening data.

6. A method for dispatching flood control gates of power stations based on water diversion inflow forecasting according to claim 5, characterized in that: Based on the determined correlation between the sediment deposition effect and the location of the flood gate, the currently required overall gate opening data and the specification information of the flood gate, the scheduling of the flood gate also includes: When the currently required overall gate opening is greater than the first preset height threshold of the opened flood control gate, the flood control gates with the largest amount of sediment residue in the range are opened sequentially according to the amount of sediment residue in the range of each flood control gate, wherein the first preset height threshold of the opened flood control gate is determined based on the specification information of the corresponding flood control gate.

7. A flood control gate dispatching system for a power station based on water diversion inflow forecasting, characterized in that: It comprises a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the steps of the power station flood control gate scheduling method based on water diversion inflow prediction according to any one of claims 1 to 6 are implemented.

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