Method and system for determining the daily power generation plan of a hydroelectric power plant unit in runoff mode.

Abstract

This application discloses a method and system for determining the daily power generation plan of a hydroelectric power station unit in runoff mode, which obtains parameters such as inflow flow, dam water level, unit power generation flow, and tailwater flow to determine the unit output load value of each unit that suits the current water situation, providing a scientific basis for determining the power generation plan of the hydroelectric power station in runoff mode, and optionally formulating the power generation plan in real time using the generator's available head and required unit power generation flow according to the operating characteristics of the hydroelectric power station in runoff mode, thereby realizing the determination and adjustment of the daily power generation plan of the hydroelectric power station unit. Therefore, by implementing this application, the daily power generation plan can be formulated rationally and effectively.

Description

[Technical Field]

[0001] This application relates to the technical field of power generation control and dam management, and more specifically, to a method and system for determining the daily power generation plan of a hydroelectric power plant unit in runoff mode. [Background technology]

[0002] In run-out mode, a hydroelectric power plant generates electricity through the inflow and outflow of a dam. In run-out mode, the inflow rate cannot be adjusted, so in most cases, the plant operates on a predetermined cycle of how much water flows in and how much electricity is generated. If the power generation rate is less than the inflow rate, the inflow rate overflows, leading to a waste of water resources. If the power generation rate is greater than the inflow rate, the dam water level drops, affecting the power generation head and efficiency. Therefore, rationally determining the power generation plan for a run-out mode hydroelectric power plant plays a crucial role in its operation. [Overview of the Initiative] [Problems that the invention aims to solve]

[0003] In view of the above circumstances, the embodiment of the present invention provides a method and system for determining the daily power generation plan of a hydroelectric power plant unit in runoff mode, in order to solve the technical problem that the power generation plan of a hydroelectric power plant in runoff mode is unreasonable in the prior art. [Means for solving the problem]

[0004] The technical solution related to this application is as follows:

[0005] In a first embodiment, the present invention provides a method for determining a daily power generation plan for hydroelectric power plants in an outflow mode, comprising the steps of: obtaining the inflow flow rate of each hydroelectric power plant unit in a hydroelectric power plant and the dam water level of a dam in the hydroelectric power plant in an outflow mode; determining the unit power generation flow rate and discharge flow rate based on the inflow flow rate; determining the effective head of each hydroelectric power plant unit through a preset processing method based on the dam water level, the unit power generation flow rate and the discharge flow rate; determining the overall operating efficiency of each hydroelectric power plant unit through a characteristic curve of each hydroelectric power plant unit based on the effective head and the unit power generation flow rate; determining the unit-side output load value of each hydroelectric power plant unit based on the effective head, the unit power generation flow rate and the overall operating efficiency; and determining the daily power generation plan for each hydroelectric power plant unit in an outflow mode based on the unit-side output load value of each hydroelectric power plant unit.

[0006] In a first embodiment, in one possible implementation of the first embodiment, the step of determining the effective head of each hydroelectric power plant unit through a preset processing method based on the dam water level, the unit power generation flow rate, and the discharge flow rate includes the step of obtaining the tailwater level of the hydroelectric power plant by processing through a preset first relational expression based on the unit power generation flow rate and the discharge flow rate, wherein the preset first relational expression reflects the relationship between the tailwater level and the discharge flow rate of the hydroelectric power plant; and the step of obtaining the effective head of each hydroelectric power plant unit through a preset processing method based on the dam water level, the unit power generation flow rate, and the tailwater level.

[0007] In the first embodiment, in another possible embodiment of the first embodiment, the step of obtaining the effective head of each hydroelectric power plant unit through a preset processing method based on the dam water level, the unit power generation flow rate and the tailwater water level includes the steps of determining the total head of the hydroelectric power plant based on the dam water level and the tailwater water level, obtaining the head loss of each hydroelectric power plant unit through the preset processing method based on the unit power generation flow rate, and determining the effective head of each hydroelectric power plant unit based on the total head and the head loss.

[0008] In the first aspect, and in yet another possible embodiment of the first aspect, the step of determining the overall operating efficiency of each hydroelectric power plant unit through a characteristic curve of each hydroelectric power plant unit based on the effective head and the unit power generation flow rate includes the steps of obtaining the runner diameter and rated rotational speed of each hydroelectric power plant unit, determining the unit flow rate and unit rotational speed of each hydroelectric power plant unit based on the effective head, the unit power generation flow rate, the runner diameter and the rated rotational speed, and determining the overall operating efficiency of each hydroelectric power plant unit through the characteristic curve based on the unit flow rate and unit rotational speed.

[0009] In the first embodiment, and in yet another possible embodiment of the first embodiment, the method further includes the steps of: obtaining a forecast inflow rate; comparing the inflow rate with the forecast inflow rate; and, if the inflow rate is greater than the forecast inflow rate, performing load adjustment on the inflow rate at a predetermined time node.

[0010] In the first embodiment, and in yet another possible implementation of the first embodiment, the step of load balancing the inflow at a preset time node includes: acquiring the power plant load mode of the hydroelectric power plant; determining whether the power plant load mode is constrained by a grid power generation command; if the power plant load mode is constrained by a grid power generation command, transmitting a hydroelectric power plant unit daily power generation plan change command to a scheduling terminal at the preset time node, and performing load balancing the inflow based on the hydroelectric power plant unit daily power generation plan change command, wherein the scheduling terminal is connected to the hydroelectric power plant; and if the power plant load mode is not constrained by a grid power generation command, performing load balancing the inflow according to a preset time interval of the hydroelectric power plant.

[0011] In the first embodiment, and in yet another possible implementation of the first embodiment, the method further includes the steps of: determining a gate operation method corresponding to a discharge facility in the hydroelectric power plant in the discharge mode based on pre-set requirements; obtaining a gate opening value corresponding to the discharge flow rate by processing the dam water level through a pre-set second relational expression, wherein the pre-set second relational expression represents a functional relationship between the discharge flow rate, the dam water level, and the gate opening; and controlling the gate operation method, based on the gate opening value, so that the dam water level satisfies a pre-set safety range.

[0012] In a second embodiment, an embodiment of the present application is a daily power generation plan determination and dam water level control system for hydroelectric power plant units in runoff mode for performing a method for determining a daily power generation plan for hydroelectric power plant units in runoff mode as described in the first embodiment of the present application and any one of the first embodiments, comprising: an acquisition unit; a processing unit; a control unit; and a determination unit, wherein the acquisition unit is used to acquire a hydroelectric power plant parameter set in runoff mode and to transmit the hydroelectric power plant parameter set to the processing unit and the control unit, and the processing unit determines each of the hydroelectric power plant units based on the hydroelectric power plant parameter set. The system provides a daily power generation plan determination and dam water level control system for hydroelectric power plants in runoff mode, which is used to determine the output load value of each hydroelectric power plant unit and transmit the output load value of each hydroelectric power plant unit to a determination unit, which is used to determine the daily power generation plan of each hydroelectric power plant unit in runoff mode based on the output load value of each hydroelectric power plant unit, and which is used to control the dam water level corresponding to the dam in the hydroelectric power plant to meet a predetermined safety range using a predetermined control method based on the hydroelectric power plant parameter set.

[0013] In a third aspect, an embodiment of the present invention provides a device for determining a daily power generation plan for hydroelectric power plants in an outflow mode, comprising: an acquisition and determination module used to acquire the inflow flow rate of each hydroelectric power plant unit in a hydroelectric power plant in an outflow mode and the dam water level of a dam in the hydroelectric power plant, and to determine the unit power generation flow rate and discharge flow rate based on the inflow flow rate; a first determination module used to determine the effective head of each hydroelectric power plant unit through a preset processing method based on the dam water level, the unit power generation flow rate and the discharge flow rate; a second determination module used to determine the overall operating efficiency of each hydroelectric power plant unit through a characteristic curve of each hydroelectric power plant unit based on the effective head and the unit power generation flow rate; a third determination module used to determine the unit-side output load value of each hydroelectric power plant unit based on the effective head, the unit power generation flow rate and the overall operating efficiency; and a fourth determination module used to determine the daily power generation plan for each hydroelectric power plant unit in an outflow mode based on the unit-side output load value of each hydroelectric power plant unit.

[0014] In a fourth aspect, an embodiment of the present application includes a memory and a processor, the memory and the processor being communicated with each other, the memory storing a computer program, and the processor executing the computer program to perform the method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode described in the first aspect of the embodiment of the present application and any one of the first aspects.

[0015] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program for causing the computer to execute a method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode described in the first aspect of the embodiment of the present application and any one of the first aspects. [Effects of the Invention]

[0016] The technical solution described in this application has the following effects.

[0017] The method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode according to an embodiment of the present application obtains parameters such as the inflow rate, dam water level, unit power generation flow rate, and discharge flow rate, determines the unit-side output load value of each unit that conforms to the current water situation, provides a scientific basis for determining the power generation plan of the hydroelectric power plant in the outflow mode, and optionally formulates the power generation plan in real time using the effective head of the generator and the required unit power generation flow rate according to the operating characteristics of hydroelectric power generation in the outflow mode, so as to realize the determination and adjustment of the daily power generation plan of the hydroelectric power plant unit. Therefore, by implementing the present application, the daily power generation plan can be formulated reasonably and effectively.

[0018] The daily power generation plan determination and dam water level control system for a hydroelectric power plant unit in the outflow mode according to an embodiment of the present application can realize the determination of the daily power generation plan of the hydroelectric power plant unit and control the dam water level within the range of safety requirements.

[0019] To more clearly explain the specific embodiments of the present application or the technical solutions of the prior art, the following briefly describes the drawings required for the description of the specific embodiments or the prior art. As is clear, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative labor.

Brief Description of the Drawings

[0020] [Figure 1] It is a flowchart of the method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode according to an embodiment of the present application. [Figure 2] It is a relationship diagram between the tailwater level and the discharge flow rate according to an embodiment of the present application. [Figure 3] It is a structural block diagram of the daily power generation plan determination and dam water level control system for a hydroelectric power plant unit in the outflow mode according to an embodiment of the present application. [ [Figure 4]This is a control flowchart of the daily power generation plan for a hydroelectric power plant unit and the dam water level control calculation system in the outflow mode according to an embodiment of the present invention. [Figure 5] This is a structural block diagram of a device for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode according to an embodiment of the present invention. [Figure 6] This is a schematic diagram of the structure of a computer-readable storage medium according to an embodiment of the present invention. [Figure 7] This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. [Modes for carrying out the invention]

[0021] To further clarify the purpose, technical solutions and advantages of the embodiments of this application, the embodiments of this application will be described below clearly and completely with reference to the drawings and technical solutions of the embodiments of this application, and as will be obvious, the embodiments described are some, but not all, embodiments of this application. All other embodiments that a person skilled in the art can obtain without creative work based on the embodiments of this application are within the scope of protection of this application.

[0022] Furthermore, terms such as "first," "second," etc., in the specification, claims, and drawings of this application are used to distinguish similar objects and are not necessarily intended to describe a specific order or sequence. It should be understood that the data used in this manner is interchangeable where appropriate, so that the embodiments of this application described herein may be carried out in an order other than that illustrated or described herein. In addition, the terms "includes," "has," and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to those steps or units that are explicitly listed, and may include other steps or units that are not explicitly listed or that are specific to those processes, methods, products, or apparatus.

[0023] Embodiments of the present invention provide a method for determining the daily power generation plan of a hydroelectric power plant unit in runoff mode, and as shown in Figure 1, the method includes the following steps 101 to 105.

[0024] Step 101: Obtain the inflow flow rate of each hydroelectric power plant unit within the hydroelectric power plant in the outflow mode and the dam water level of the dam within the hydroelectric power plant, and determine the unit power generation flow rate and discharge flow rate based on the inflow flow rate.

[0025] Specifically, the inflow flow rate Q can be collected by an inflow flow rate acquisition device installed on the upstream side of the dam. This inflow flow rate acquisition device may be a flow meter or a water level meter. If it is a water level meter, it is necessary to convert the flow rate using the water level meter, thereby obtaining the inflow flow rate Q of the hydroelectric power plant in the outflow mode.

[0026] The dam water level H can also be obtained by attaching a water level sensor.

[0027] In the embodiments of this application, to improve the accuracy of the acquired inflow rate Q, firstly, if the dam water level fluctuates, the average value of the dam water level during the calculation period can be used as the dam water level acquired in the embodiments of this application. Secondly, since there are still certain errors in the calculation of water level, output, head, and efficiency, problems of water level fluctuations and result delays arise when calculating the inflow rate using the dam water level. Therefore, in the embodiments of this application, a flow meter is simultaneously installed on the upstream side of the dam, and a comparative analysis is performed on the rate of change of water level and the data acquired by the inflow flow meter. By having the two complement each other, the final inflow rate Q is obtained, making it easier to provide high-precision data support for subsequent hydroelectric power plant power generation planning and gate control.

[0028] Next, it is necessary to maintain a balance between the discharge flow rate and the inflow flow rate, depending on the operating characteristics of the dam in the outflow mode. When the discharge flow rate passes through the hydroelectric power plant unit as a whole, the unit's power generation flow rate q should be equal to Q, and if the inflow flow rate during flood season is greater than the unit's maximum power generation flow rate, the unit's power generation flow rate should be equal to the power generation flow rate q at maximum rated output.max The remaining flow rate is controlled by opening and closing the gates of the water discharge facility, and at this time the discharge flow rate is X = Qq max That is the case.

[0029] Step 102: Based on the dam water level, the unit power generation flow rate, and the discharge flow rate, the effective head of each hydroelectric power plant unit is determined through a preset processing method.

[0030] Specifically, the unit flow rate q(i) can be obtained from the unit power generation flow rate q, and the effective head h of each hydroelectric power plant unit can be selectively determined by combining the unit flow rate q(i), the dam water level H, and the discharge flow rate X. 有効水頭 You can obtain this.

[0031] Step 103: Based on the effective head and the unit power generation flow rate, the overall operating efficiency of each hydroelectric power plant unit is determined through the characteristic curve of each hydroelectric power plant unit.

[0032] The characteristic curve of a hydroelectric power plant unit may be either an overall characteristic curve or an operating characteristic curve.

[0033] Selectively, by combining the effective head and unit power generation flow rate of the hydroelectric power plant unit according to the characteristic curve, the overall operating efficiency η = η 水力タービン *η 発電機 This can be determined. Here, the hydroelectric turbine and the generator represent two different types of hydroelectric power plant units.

[0034] Specifically, when determining the unit's operating efficiency using the unit's overall characteristic curve or operating characteristic curve, the discharge flow rate changes accordingly when the number of generators in operation differs, and the effective head of the unit changes synchronously when the downstream tailwater level changes. Therefore, the generator efficiency under different operating methods is determined by sequentially plotting the efficiency change relationship curves under different generator operating combinations on the hydraulic turbine's characteristic curve.

[0035] When determining the overall operating efficiency of a hydroelectric power plant unit according to the overall characteristic curve or operating characteristic curve of the hydroelectric power plant unit, the parameters in the overall characteristic curve or operating characteristic curve of the hydroelectric power plant unit are generally parameters of a designed model machine, and are affected by factors such as manufacturing, installation, and actual operating conditions, resulting in certain differences in the unit's efficiency flow rate and head-related curves. Therefore, in the embodiments of this application, it is necessary to accumulate operating data and correct the relationship between the unit's operating efficiency and head and flow rate.

[0036] Step 104: Based on the effective head, the unit power generation flow rate, and the overall operating efficiency, the unit-side output load value of each hydroelectric power plant unit is determined.

[0037] Specifically, the unit-side output load value P for each hydroelectric power plant unit is calculated using the following relational equation (1). P=9.81*h 有効水頭 *q*η (1)

[0038] Step 105: Based on the unit-side output load value of each hydroelectric power plant unit, the daily power generation plan for the hydroelectric power plant units in the outflow mode is determined.

[0039] Specifically, the unit-side output load value P of each hydroelectric power plant unit is used to control the power generation of each hydroelectric power plant unit in the outflow mode. Therefore, the daily power generation plan for each hydroelectric power plant unit in the outflow mode can be determined simply by using the unit-side output load value P of each hydroelectric power plant unit.

[0040] In the process of determining the daily power generation plan for the hydroelectric power plant unit, if Q is greater than q, the unit-side output load value P, which is the output of the unit, is increased until the total power generation flow rate q is equal to the inflow flow rate Q. If Q is less than q, the unit output is decreased until the total power generation flow rate q is equal to the inflow flow rate Q. This matches the inflow flow rate with the active power output of the power plant and ensures a balance of the dam water level in the outflow mode.

[0041] The method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode according to the embodiment of the present invention determines the unit-side output load value of each unit that is suitable for the current water conditions by acquiring parameters such as the inflow flow rate, dam water level, unit power generation flow rate, and discharge flow rate, providing a scientific basis for determining the power generation plan of the hydroelectric power plant in the outflow mode, and selectively formulating a power generation plan in real time using the effective head of the generator and the required unit power generation flow rate according to the operating characteristics of the hydroelectric power plant in the outflow mode, thereby realizing the determination and adjustment of the daily power generation plan of the hydroelectric power plant unit. Therefore, by implementing the present invention, the daily power generation plan can be formulated rationally and effectively.

[0042] As one selectable embodiment of the embodiments of the present application, step 102 includes the steps of obtaining the tailwater level of the hydroelectric power plant by processing through a preset first relational expression based on the unit power generation flow rate and the discharge flow rate, and obtaining the effective head of each of the hydroelectric power plant units by processing through a preset processing method based on the dam water level, the unit power generation flow rate and the tailwater level.

[0043] The pre-defined first relational equation reflects the relationship between the tailwater level and discharge flow rate of a hydroelectric power plant. As shown in Figure 2, it may be calculated according to the discharge channel structure, calibrated according to many years of operating data, or obtained from the design report at the time of the power plant's design. This curve is an important curve in the design and operation of hydroelectric power plants.

[0044] Specifically, the water-level-to-flow-per-cycle relationship using natural river channels is applicable when station control and channel control are good and stable. The characteristics of this type of water-level-to-flow-per-cycle relationship are mainly that station control is good and the factors influencing the water-level-to-flow-per-cycle relationship are maintained stably with changes in water level. The water-level-to-flow-per-cycle relationship is either a single curve, or the factors influencing the water-level-to-flow-per-cycle relationship change with changes in water level, but influencing factors such as area and average flow velocity can compensate for each other, thereby making the water-level-to-flow-per-cycle relationship a single line, that is, there is only one flow rate at the same water level, and it can satisfy the Manning equations shown in the following relations (2) and (3).

[0045] In formula TIFF0007909616000001.tif1963, Q is the flow rate (m³). 3 A represents the area of ​​the cross-section (m²), where A is the area of ​​the cross-section (m²). 2 ) represents the mean flow velocity (m / s) across the cross-section, n represents the riverbed roughness (a dimensionless quantity), R represents the hydraulic radius (m), and S represents the water surface gradient.

[0046] The roughness values ​​are calibrated using the measured water level elevation and the water level of historical floods, and the water level under each flow rate in the original river channel topography is calculated and compared with the natural water level-flow relationship curve of the tailwater section of the dam site plant to ensure that the adopted calculation model and parameter values ​​are reasonable.

[0047] After the power plant has been operating normally, the tailwater water level and discharge flow rate data measured by the water level gauge can be used to generate a relationship curve graph between the actual flow rate and water level. A new relationship calculation formula can then be fitted using a polynomial relationship. By analyzing and comparing this with the natural river channel water level-flow rate relationship curve from the design phase, deviation value analysis and data correction can be performed, which can provide reference for the impact on later river channel changes and power generation efficiency.

[0048] Optionally, since the dam water level in the outflow mode can generally be maintained stably, in many cases, the head of the power plant unit is greatly affected by the tailwater level, and the tailwater flow relationship of the hydropower plant often only gives the water level and flow relationship of the original river channel before project construction during project design. After the project is completed, the river channel situation changes. Also, during the flood period, the discharge (surplus water flow) during water release has a great impact on the tailwater level of the power plant. Therefore, it is necessary to recheck and calculate the relationship between the discharge flow and the tailwater level after the project is completed or accumulate operation experience. Therefore, in the embodiments of the present application, it is necessary to obtain the relationship curve and model between the actual discharge flow and the tailwater level through continuous data recording.

[0049] Specifically, based on the unit power generation flow rate q and the discharge flow rate X, the tailwater level L of the hydropower plant can be calculated according to the relationship between the tailwater level and the discharge flow rate of the hydropower plant.

[0050] Optionally, based on the dam water level, the unit power generation flow rate, and the tailwater level, through a preset processing method, the step of obtaining the effective head of each hydropower plant unit includes: determining the total head of the hydropower plant based on the dam water level and the tailwater level; obtaining the loss head of each hydropower plant unit through the preset processing method based on the unit power generation flow rate; and determining the effective head of each hydropower plant unit based on the total head and the loss head.

[0051] First, the total head h of the hydropower plant is obtained using the following relational expression (4). 総水頭 to obtain. h 総水頭 =H - L (4)

[0052] Next, according to the description of step 102, using the unit throughput q(i), the loss head of each hydropower plant unit is obtained in combination with the preset layout of the water conveyance system.

[0053] Head loss generally includes local head loss at the intake (intake tower) and trash rack, as well as friction loss in the water conduit pressure pipe, and is obtained according to the design documents or the formula for calculating head loss of pressure piping.

[0054] Specifically, generally, during the project design phase, the head loss for each component—the intake, trash rack, gate groove, and pressure conduit—is already calculated and checked. Therefore, in actual application, head loss data can be obtained simply by examining the relevant design documents. Below, the general formulas for calculating the local head loss for the intake and trash rack, and the friction loss for the pressure conduit are given.

[0055] (1) Local head loss Δh of the trash rack, bell mouth, inspection gate groove and operating gate groove, depending on the shape of the water intake. 損失 This is calculated using the following relation (5).

[0056] In formula TIFF0007909616000002.tif870, ξ represents the local head loss coefficient, and g represents the acceleration due to gravity, with a value of 9.81 m / s². 2 V 2 / 2g represents the average flow velocity and head of the area.

[0057] (2) The frictional head loss of a pressure steel pipe is calculated using the following relational equations (6) and (7).

[0058] In formula TIFF0007909616000003.tif1470, L represents the calculated length of the water supply channel (m), C represents the Chezy coefficient, which is calculated using the Manning formula, R represents the hydraulic radius (m), and n represents the roughness value (n=0.014 for concrete, n=0.012 for steel pipes, and the average roughness value can be obtained).

[0059] Finally, using the following relation (8), the effective head h of the hydroelectric power plant unit can be expressed. 有効水頭 Calculate. h 有効水頭 =h 総水頭 -Δh 損失 (8)

[0060] As one selectable embodiment of the embodiments of the present invention, step 103 includes the steps of: obtaining the runner diameter and rated rotational speed of each of the hydroelectric power plant units; determining the unit flow rate and unit rotational speed of each of the hydroelectric power plant units based on the effective head, the unit power generation flow rate, the runner diameter and the rated rotational speed; and determining the overall operating efficiency of each of the hydroelectric power plant units through the characteristic curve based on the unit flow rate and unit rotational speed.

[0061] Specifically, the unit flow rate and unit rotational speed of each unit are calculated in combination with the runner diameter and rated rotational speed of the unit, based on the effective head and power generation flow rate of each unit. Then, the operating efficiency of the unit is determined in the characteristic curve described in step 103, based on the unit flow rate and unit rotational speed.

[0062] As one selectable embodiment of the embodiments of the present invention, the method further includes the steps of: obtaining a forecast inflow rate; comparing the inflow rate with the forecast inflow rate; and, if the inflow rate is greater than the forecast inflow rate, performing load adjustment on the inflow rate at a preset time node.

[0063] Specifically, according to the explanation in step 101, after calculating the inflow rate based on the dam water level change, the calculated inflow rate is compared with the forecast inflow rate. If the inflow rate or the dam water level deviation exceeds the forecast inflow rate, which is a set value, load adjustment correction must be performed at the next time node, which is a pre-set time node.

[0064] The step of performing load adjustment on the inflow flow rate at a selectable, pre-set time node includes the steps of: obtaining the power plant load mode of the hydroelectric power plant; determining whether the power plant load mode is subject to grid power generation orders; if the power plant load mode is subject to grid power generation orders, transmitting a hydroelectric power plant unit daily power generation plan change order to a scheduling terminal at the pre-set time node, and performing load adjustment on the inflow flow rate based on the hydroelectric power plant unit daily power generation plan change order, wherein the scheduling terminal is connected to the hydroelectric power plant; and if the power plant load mode is not subject to grid power generation orders, performing load adjustment on the inflow flow rate according to a pre-set time interval of the hydroelectric power plant.

[0065] Specifically, when the power plant load adjustment mode is constrained by grid power generation commands, a request for a change in the power generation plan is submitted to the scheduling side at the corresponding time node, and load adjustment correction is performed at the next time node. If the power plant load adjustment is not constrained in any way, the load is adjusted in real time according to the interval time set by the power plant, in accordance with the changes in inflow flow rate.

[0066] As one selectable embodiment of the embodiments of the present invention, the method further includes the steps of: determining a gate operation method corresponding to a discharge facility in the hydroelectric power plant in the discharge mode based on pre-set requirements; obtaining a gate opening value corresponding to the discharge flow rate based on the dam water level by processing through a pre-set second relational expression; and in the gate operation method, controlling the dam water level to satisfy a pre-set safety range based on the gate opening value.

[0067] The pre-defined second relational equation represents the functional relationship between the discharge flow rate, the dam water level, and the gate opening.

[0068] The dam operates in runoff mode, and during flood season (excess water season), if the inflow rate is greater than the maximum rated power generation rate, all hydroelectric power plant units generate power according to their rated capacity, and the excess inflow rate must be discharged through the discharge facilities. Therefore, in runoff mode, if the inflow rate Q is greater than the unit power generation rate q, the inflow rate will continue to change due to the influence of upstream hydrological and meteorological changes and peak shifts at upstream power plants. It is necessary to continuously calculate the gate opening of the spillway and determine a reasonable discharge rate, thereby controlling the dam water level within the range of safety requirements.

[0069] First, in accordance with the relevant regulations for the operation requirements of the water supply structure of the water discharge facility, the relevant regulations and requirements for the necessary gate opening operations are determined, and the gate operation method is decided.

[0070] Next, the flow rate opening relationship function of the water discharge facility is obtained and shown in the following relation (9). TIFF0007909616000004.tif863

[0071] Selectively, a discharge capacity table can be calculated for different water level elevations according to the flow rate opening relationship function of the discharge facility, and then gate opening values ​​for different discharge flow rates are obtained by linear interpolation.

[0072] In one embodiment, a table showing the relationship between the flow rate of the water discharge facility, the water level, and the opening degree is provided, as shown in Table 1 below.

[0073] JPEG0007909616000005.jpg125145

[0074] Based on Table 1 above, linear interpolation methods based on Excel formulas and VBA programming are provided, as follows:

[0075] 1. Formula for a linear interpolation table based on Excel. IF(OR(xi>MAX(x),xi<MIN(x),yi> MAX(y), yi <MIN(y)),NA(),IF(AND(xi=MAX(x),yi=MAX(y)),OFFSET(o,MATCH(xi,x),MATCH(yi,y)),IF(xi=MAX(x),FORECAST(yi,OFFSET(o,MATCH(xi,x),MATCH(yi,y),1,2),OFFSET(o,0,MATCH(yi,y),1,2)),IF(yi=MAX(y),FORECAST(xi,OFFSET(o,MATCH(xi,x),MATCH(yi,y),2,1),OFFSET(o,MATCH(xi,x),0,2,1)),MMULT(MMULT({1,0}+{-1,1}*FORECAST(xi,{0;1},OFFSET(o,MATCH(xi,x),0,2,1)),OFFSET(o,MATCH(xi,x),MATCH(yi,y),2,2)),{1;0}+{-1;1}*FORECAST(yi,{0,1},OFFSET(o,0,MATCH(yi,y),1,2))))))) Here, X: Vertical cell condition area Y: Horizontal conditional cell area 0: X, Y intersection cell

[0076] 2. Formula for linear interpolation based on Excel VBA programming Function LinearityInterpolation(NodeNum As Long, X() As Single, Y() As Single, MyX As Single) As Single Linear interpolation Input: X(), Y(), NodeNum, MyX Output: Y value of interpolation calculation Dim i As Single Dim X0 As Single, Y0 As Single Dim X1 As Single, Y1 As Single Dim K As Single 'Gradient For i = 0 To NodeNum - 1 If X(i) = MyX Then If the X value of a node is equal to that node, the Y value is directly fed back. LinearityInterpolation = Y(i) Exit Function End By If X(i) > MyX Then If i > 0 Then When it is between nodes, linear interpolation is performed. X0 = X(i - 1) Y0 = Y(i - 1) X1 = X(i) Y1 = Y(i) If Y1 = Y0 Then LinearityInterpolation = Y1 Else K = (X1 - X0) / (Y1 - Y0) LinearityInterpolation = (MyX - X0) / K + Y0 Exit Function End By Else 'If it is before the first node, perform reverse extrapolation.' X0 = X(1): Y0 = Y(1) X1 = X(0): Y1 = Y(0) If Y1 = Y0 Then LinearityInterpolation = Y1 Else K = (X1 - X0) / (Y1 - Y0) LinearityInterpolation = (MyX - X0) / K + Y0 End By Exit Function End By Exit For End By Next i 'If it is after the last node, perform extrapolation.' If i = NodeNum Then X0 = X(i - 2): Y0 = Y(i - 2) X1 = X(i - 1): Y1 = Y(i - 1) If Y1 = Y0 Then LinearityInterpolation = Y1 Else K = (X1 - X0) / (Y1 - Y0) If K <> 0 Then LinearityInterpolation = (MyX - X0) / K + Y0 Else LinearityInterpolation = Y0 End By End By End By End Function

[0077] Finally, in the gate operation method, the gate opening of the spillway is continuously calculated using the flow rate-opening relationship function of the discharge facility to determine a reasonable discharge flow rate, thereby controlling the dam water level within the range of safety requirements.

[0078] Embodiments of the present invention further provide a system for determining daily power generation plans and controlling dam water levels for hydroelectric power plant units in runoff mode, as shown in Figure 3, the system 2 for determining daily power generation plans and controlling dam water levels for hydroelectric power plant units in runoff mode includes an acquisition unit 21, a processing unit 22, a determination unit 23, and a control unit 24.

[0079] The acquisition unit 21 is connected to the processing unit 22 and the control unit 24, respectively, and the processing unit 22 is connected to the decision unit 23.

[0080] The functions of each device in the system are described as selectable.

[0081] Specifically, the daily power generation plan determination and dam water level control system 2 for the hydroelectric power plant unit in the outflow mode is used to perform the method for determining the daily power generation plan for the hydroelectric power plant unit in the outflow mode described in the above embodiment of the present application. First, the acquisition unit 21 is used to acquire a hydroelectric power plant parameter set in discharge mode and to transmit the hydroelectric power plant parameter set to the processing unit 22 and the control unit 24. The hydroelectric power plant parameter set may include the inflow flow rate of each hydroelectric power plant unit within the hydroelectric power plant, the dam water level of the dam within the hydroelectric power plant, and the unit power generation flow rate and discharge flow rate determined based on the inflow flow rate.

[0082] For specific acquisition and determination processes, please refer to the description of step 101 of the method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode according to the above embodiment of this application, and a redundant explanation will be omitted here.

[0083] The processing unit 22 is used to determine the unit-side output load value of each hydroelectric power plant unit based on the hydroelectric power plant parameter set, and to transmit the unit-side output load value of each hydroelectric power plant unit to the determination unit 23.

[0084] For the process of determining the unit-side output load value of each hydroelectric power plant unit, please refer to steps 102 to 104 and the description of the limiting steps in each step of the method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode according to the above embodiment of the present invention, and repeating explanations will be omitted here.

[0085] The determination unit 23 is used to determine the daily power generation plan for each hydroelectric power plant unit in the outflow mode based on the unit-side output load value of each hydroelectric power plant unit. For the specific determination process, please refer to the description of step 105 of the method for determining the daily power generation plan for hydroelectric power plant units in the outflow mode according to the above embodiment of the present application, and a redundant explanation will be omitted here.

[0086] The control unit 24 is used to control the dam water level corresponding to the dam within the hydroelectric power plant to meet a predetermined safety range, using a predetermined control method based on the hydroelectric power plant parameter set. For the specific control process, please refer to the implementation process corresponding to controlling the dam water level to meet a predetermined safety range in the method for determining the daily power generation plan of the hydroelectric power plant unit in the outflow mode according to the above embodiment of the present application, and a redundant explanation will be omitted here.

[0087] The daily power generation plan determination and dam water level control system for a hydroelectric power plant unit in the outflow mode according to the embodiment of the present invention can determine the daily power generation plan for the hydroelectric power plant unit and control the dam water level within the range of safety requirements.

[0088] One example provides a calculation system for daily power generation planning and dam water level control for hydroelectric power plant units in outflow mode, which includes a dam water level acquisition module, a unit-specific output acquisition module, a tailwater water level calculation module, a head loss calculation module, an effective head calculation module, a unit operating efficiency calculation module, and a spillway drainage facility flow rate calculation module.

[0089] The system is connected to the communication and control module of the power plant monitoring system AGC module and the communication and control module of the power plant water discharge facility system, respectively.

[0090] The dam water level acquisition module is used to acquire the dam water level; the unit output acquisition module is used to acquire the output of each unit; the tailwater water level calculation module, head loss calculation module, and effective head calculation module are used to calculate the tailwater water level, head loss, and effective head; the unit operating efficiency calculation model is used to calculate the operating efficiency of a unit according to the effective head and the unit power generation flow rate; and the discharge facility flow rate calculation module is used to calculate the relationship between the discharge flow rate and the gate opening of the discharge facility under different dam water level elevations.

[0091] Selectively, the system enables the distribution and correction of unit load commands by distributing the calculated daily power generation plan to the communication and control modules of the power plant monitoring system AGC module, and enables the opening and closing of gates by distributing and correcting the calculated discharge facility gate opening commands to the communication and control modules of the power plant discharge facility system.

[0092] The control process of the system is shown in Figure 4, which is optional.

[0093] This daily power generation planning and dam water level control calculation system for hydroelectric power plant units in runoff mode enables communication and control functions with the AGC power plant monitoring system's functional module and the spillway gate control system. It also enables automatic collection and acquisition of relevant data and information, automatic calculation, command distribution, comprehensive judgment, and alarm functions, providing a scientific basis for the automatic water-electric scheduling integration function of dams and power plants in runoff mode.

[0094] Embodiments of the present invention further provide a device for determining the daily power generation plan of a hydroelectric power plant unit in runoff mode, which, as shown in Figure 5, includes an acquisition / determination module 301, a first determination module 302, a second determination module 303, a third determination module 304, and a fourth determination module 305.

[0095] The acquisition and determination module 301 is used to acquire the inflow flow rate of each hydroelectric power plant unit within the hydroelectric power plant in discharge mode and the dam water level of the dam within the hydroelectric power plant, and to determine the unit power generation flow rate and discharge flow rate based on the inflow flow rate. For details, please refer to the relevant description in step 101 of the above embodiment of the method.

[0096] The first determination module 302 is used to determine the effective head of each hydroelectric power plant unit through a preset processing method based on the dam water level, the unit power generation flow rate, and the discharge flow rate. For details, please refer to the relevant description of step 102 in the above-described embodiment of the method.

[0097] The second determination module 303 is used to determine the overall operating efficiency of each hydroelectric power plant unit through the characteristic curve of each hydroelectric power plant unit, based on the effective head and the unit power generation flow rate. For details, please refer to the relevant description in step 103 of the above embodiment of the method.

[0098] The third determination module 304 is used to determine the unit-side output load value of each hydroelectric power plant unit based on the effective head, the unit power generation flow rate, and the overall operating efficiency. For details, please refer to the relevant description in step 104 of the above embodiment of the method.

[0099] The fourth determination module 305 is used to determine the daily power generation plan for the hydroelectric power plants in the outflow mode based on the unit-side output load value of each of the hydroelectric power plants; refer to the relevant description of step 105 of the above embodiment for details.

[0100] The device for determining the daily power generation plan of a hydroelectric power plant unit in outflow mode according to the embodiment of the present invention acquires parameters such as inflow flow rate, dam water level, unit power generation flow rate, and discharge flow rate to determine the unit-side output load value of each unit that is suitable for the current water conditions, provides a scientific basis for determining the power generation plan of the hydroelectric power plant in outflow mode, and selectively sets up a power generation plan in real time using the effective head of the generator and the required unit power generation flow rate according to the operating characteristics of the hydroelectric power plant in outflow mode, thereby realizing the determination and adjustment of the daily power generation plan of the hydroelectric power plant unit. Therefore, by implementing the present invention, a daily power generation plan can be set up rationally and effectively.

[0101] As one selectable embodiment of the embodiments of the present invention, the first determination module is used to obtain the tailwater level of the hydroelectric power plant by processing the unit power generation flow rate and the discharge flow rate through a preset first relational expression, the preset first relational expression being a first processing submodule that reflects the relationship between the tailwater level and the discharge flow rate of the hydroelectric power plant, and the second processing submodule is used to obtain the effective head of each hydroelectric power plant unit by processing the dam water level, the unit power generation flow rate and the tailwater level through a preset processing method.

[0102] As one selectable embodiment of the embodiments of the present application, the second processing submodule includes a first determination submodule used to determine the total head of the hydroelectric power plant based on the dam water level and the tailwater water level; a third processing submodule used to obtain the head loss of each of the hydroelectric power plant units through the preset processing method based on the unit power generation flow rate; and a second determination submodule used to determine the effective head of each of the hydroelectric power plant units based on the total head and the head loss.

[0103] As one selectable embodiment of the embodiments of the present application, the second determination module includes a first acquisition submodule used to acquire the runner diameter and rated rotational speed of each of the hydroelectric power plant units; a third determination submodule used to determine the unit flow rate and unit rotational speed of each of the hydroelectric power plant units based on the effective head, the unit power generation flow rate, the runner diameter and the rated rotational speed; and a fourth determination submodule used to determine the overall operating efficiency of each of the hydroelectric power plant units through the characteristic curve based on the unit flow rate and unit rotational speed.

[0104] As one selectable embodiment of the embodiments of the present invention, the apparatus further includes an acquisition module used to acquire a forecast inflow rate; a comparison module used to compare the inflow rate with the forecast inflow rate; and an adjustment module used to adjust the load on the inflow rate at a preset time node if the inflow rate is greater than the forecast inflow rate.

[0105] As one selectable embodiment of the embodiments of the present invention, the adjustment module includes: a second acquisition submodule used to acquire the power plant load mode of the hydroelectric power plant; a determination submodule used to determine whether the power plant load mode is subject to grid power generation orders; a first adjustment submodule used to send a hydroelectric power plant unit daily power generation plan change order to a scheduling terminal at a preset time node when the power plant load mode is subject to grid power generation orders, and to perform load adjustment on the inflow rate based on the hydroelectric power plant unit daily power generation plan change order, the scheduling terminal being connected to the hydroelectric power plant; and a second adjustment submodule used to perform load adjustment on the inflow rate according to a preset time interval of the hydroelectric power plant when the power plant load mode is not subject to grid power generation orders.

[0106] As one selectable embodiment of the embodiments of the present invention, the apparatus further includes: a fifth determination module used to determine a gate operation method corresponding to a discharge facility in the hydroelectric power plant in the discharge mode based on pre-set requirements; a processing module used to obtain a gate opening value corresponding to the discharge flow rate by processing the dam water level through a pre-set second relational expression, the pre-set second relational expression representing a functional relationship between the discharge flow rate, the dam water level, and the gate opening; and a control module used in the gate operation method to control the dam water level to satisfy a pre-set safety range based on the gate opening value.

[0107] For a detailed explanation of the function of the device for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode according to the embodiment of this application, please refer to the explanation of the method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode according to the embodiment described above.

[0108] An embodiment of the present invention further provides a storage medium in which a computer program 601 is stored, as shown in Figure 6, and when the program is executed by a processor, it realizes the steps of the method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode according to the above embodiment. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD), and the storage medium may include a combination of the above types of memory.

[0109] As a person skilled in the art will understand, all or part of the process of the above embodiment can be implemented by issuing instructions to the relevant hardware by a computer program, which may be stored on a computer-readable storage medium, and which may include the process of each embodiment of the above method when executed. The storage medium may be a magnetic disk, an optical disk, read-only memory (ROM), random access memory (RAM), flash memory, a hard disk drive (HDD), or a solid-state drive (SSD), and the storage medium may include a combination of the above types of memory.

[0110] Embodiments of the present invention further provide an electronic device, which may include a processor 71 and a memory 72, as shown in Figure 7, wherein the processor 71 and the memory 72 may be connected via a bus or other means, with Figure 7 showing a bus connection as an example.

[0111] The processor 71 may be a central processing unit (CPU). The processor 71 may also be a chip such as another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, or a combination of the above various chips.

[0112] Memory 72 can be used as a non-temporary computer-readable storage medium to store non-temporary software programs, non-temporary computer-executable programs, and modules such as the corresponding program instructions / modules in the embodiments of the present application. The processor 71 executes the non-temporary software programs, instructions, and modules stored in memory 72 to perform various functional applications and data processing, that is, to realize the method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode according to the above embodiment of the method.

[0113] Memory 72 may include a program storage area and a data storage area, the program storage area can store application programs required for an operating device or at least one function, and the data storage area can store data created by the processor 71, etc. Memory 72 may also include high-speed random-access memory and may further include non-temporary memory such as at least one disk storage device, flash memory device, or other non-temporary solid-state storage device. In some embodiments, memory 72 optionally includes memory installed remotely from the processor 71, and these remote memories may be connected to the processor 71 via a network. Examples of the network include, but are not limited to, the Internet, intranet, local area network, mobile communication network, and combinations thereof.

[0114] The one or more modules are stored in the memory 72 and, when executed by the processor 71, the method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode according to the embodiment shown in Figures 1-2 is executed.

[0115] Details of the above-mentioned electronic equipment can be understood by referring to the corresponding related descriptions and effects of the embodiments shown in Figures 1 and 2, and redundant explanations are omitted here.

[0116] While embodiments of the present application have been described with reference to the drawings, those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and such changes and modifications all fall within the scope defined in the attached claims.

Claims

1. A method for determining the daily power generation plan of a hydroelectric power plant unit in runoff mode, The steps include obtaining the inflow flow rate of each hydroelectric power plant unit within the hydroelectric power plant in the outflow mode and the dam water level of the dam within the hydroelectric power plant, and determining the unit power generation flow rate and discharge flow rate based on the inflow flow rate, The steps include determining the effective head of each hydroelectric power plant unit through a predetermined processing method based on the dam water level, the unit power generation flow rate, and the discharge flow rate, The steps include determining the overall operating efficiency of each hydroelectric power plant unit through the characteristic curve of each hydroelectric power plant unit based on the effective head and the unit's power generation flow rate, The steps include determining the unit-side output load value of each hydroelectric power plant unit based on the effective head, the unit power generation flow rate, and the overall operating efficiency, The step of determining a daily power generation plan for the hydroelectric power plant units in the outflow mode based on the unit-side output load value of each of the hydroelectric power plant units, Steps to obtain forecast inflow flow rate, The steps include comparing the aforementioned inflow rate with the aforementioned forecast inflow rate, If the inflow rate is greater than the forecast inflow rate, the method further includes the step of performing load adjustment on the inflow rate at a predetermined time node, The step of performing load adjustment on the inflow flow rate at a pre-set time node is: The steps include: acquiring the power plant load mode of the hydroelectric power plant; The steps include determining whether the power plant load mode is subject to the constraints of grid power generation commands, When the power plant load mode is constrained by the grid power generation command, the following steps are taken: sending a hydroelectric power plant unit daily power generation plan change command to the scheduling terminal at the predetermined time node to request a change in the power generation plan to the scheduling terminal; and, based on the hydroelectric power plant unit daily power generation plan change command, performing load adjustments to the inflow flow rate at the next predetermined time node, wherein the scheduling terminal is connected to the hydroelectric power plant. If the power plant load mode is not constrained by the grid power generation command, the step includes adjusting the load on the inflow flow rate according to a predetermined fixed time interval of the hydroelectric power plant, The step of determining the overall operating efficiency of each hydroelectric power plant unit through the characteristic curve of each hydroelectric power plant unit, based on the effective head and the unit's power generation flow rate, is: The steps include obtaining the runner diameter and rated rotational speed of each of the aforementioned hydroelectric power plant units, A step of determining the unit flow rate and unit rotation speed of each hydroelectric power plant unit based on the effective head, the unit power generation flow rate, the runner diameter, and the rated rotation speed, A method for determining a daily power generation plan for hydroelectric power plants in a discharge mode, comprising the step of determining the overall operating efficiency of each hydroelectric power plant unit through a characteristic curve which is an overall characteristic curve or an operating characteristic curve corrected based on the accumulated operating data of each hydroelectric power plant unit, based on the unit flow rate and unit rotational speed.

2. The step of determining the effective head of each hydroelectric power plant unit through a predetermined processing method based on the dam water level, the unit power generation flow rate, and the discharge flow rate is: The steps include obtaining the tailwater level of the hydroelectric power plant based on the unit power generation flow rate and the discharge flow rate, The method according to claim 1, characterized by comprising the step of obtaining the effective head of each hydroelectric power plant unit through a predetermined processing method based on the dam water level, the unit power generation flow rate, and the tailwater water level.

3. The step of obtaining the effective head of each hydroelectric power plant unit through a predetermined processing method based on the dam water level, the unit power generation flow rate, and the tailwater water level is: The steps include determining the total head of the hydroelectric power plant based on the dam water level and the tailwater water level, The steps include obtaining the head loss of each hydroelectric power plant unit through the preset processing method based on the unit's power generation flow rate, The method according to claim 2, further comprising the step of determining the effective head of each hydroelectric power plant unit based on the total head and the head loss.

4. The steps include determining a gate operation method corresponding to the discharge facility within the hydroelectric power plant in the discharge mode based on pre-set requirements, The steps include obtaining a gate opening value corresponding to the discharge flow rate based on the dam water level, The method according to claim 1, further comprising the step of controlling the dam water level to satisfy a preset safety range based on the gate opening value.

5. A system for determining a daily power generation plan for a hydroelectric power plant unit in an outflow mode and controlling a dam water level, for performing a method for determining a daily power generation plan for a hydroelectric power plant unit in an outflow mode according to any one of claims 1 to 4, comprising: an acquisition unit; a processing unit; a control unit; and a determination unit. The acquisition unit is used to acquire the hydroelectric power plant parameter set in the outflow mode and to transmit the hydroelectric power plant parameter set to the processing unit and the control unit. The processing unit is used to determine the unit-side output load value of each hydroelectric power plant unit based on the hydroelectric power plant parameter set, and to transmit the unit-side output load value of each hydroelectric power plant unit to the determination unit. The determination unit is used to determine the daily power generation plan for the hydroelectric power plant units in the outflow mode based on the unit-side output load value of each of the hydroelectric power plant units. A system for determining a daily power generation plan and controlling the dam water level of a hydroelectric power plant unit in an outflow mode, characterized in that the control unit is used to control the dam water level corresponding to a dam within the hydroelectric power plant to meet a predetermined safety range, using a predetermined control method based on the hydroelectric power plant parameter set.

6. A device for determining the daily power generation plan of a hydroelectric power plant unit in outflow mode, An acquisition and determination module used to acquire the inflow flow rate of each hydroelectric power plant unit within a hydroelectric power plant in discharge mode and the dam water level of the dam within the hydroelectric power plant, and to determine the unit power generation flow rate and discharge flow rate based on the inflow flow rate, A first determination module used to determine the effective head of each hydroelectric power plant unit through a preset processing method based on the dam water level, the unit power generation flow rate, and the discharge flow rate, A second determination module used to determine the overall operating efficiency of each hydroelectric power plant unit through the characteristic curve of each hydroelectric power plant unit, based on the effective head and the unit power generation flow rate, A third determination module used to determine the unit-side output load value of each hydroelectric power plant unit based on the effective head, the unit power generation flow rate, and the overall operating efficiency, Includes a fourth decision module used to determine the daily power generation plan of the hydroelectric power plant units in the outflow mode, based on the unit-side output load value of each of the hydroelectric power plant units, An acquisition module used to obtain forecast inflow flow rate, A comparison module used to compare the aforementioned inflow rate with the aforementioned forecast inflow rate, The system further includes, if the inflow rate is greater than the forecast inflow rate, an adjustment module used to adjust the load on the inflow rate at a preset time node, The adjustment module is A second acquisition submodule used to acquire the power plant load mode of the aforementioned hydroelectric power plant, A determination submodule used to determine whether the power plant load mode is subject to grid power generation commands, When the power plant load mode is constrained by the grid power generation command, a hydroelectric power plant unit daily power generation plan change command is sent to the scheduling terminal at the preset time node to request a change in the power generation plan to the scheduling terminal, and based on the hydroelectric power plant unit daily power generation plan change command, load adjustment is performed on the inflow flow rate at the next preset time node, and the scheduling terminal is connected to the hydroelectric power plant and a first adjustment submodule, The power plant load mode is not subject to the constraints of the grid power generation command, and includes a second adjustment submodule used to adjust the load on the inflow flow rate according to a predetermined fixed time interval of the hydroelectric power plant, Here, the aforementioned second decision module is, The runner diameter and rated rotational speed of each of the aforementioned hydroelectric power plant units are obtained. Based on the effective head, the unit power generation flow rate, the runner diameter, and the rated rotational speed, the unit flow rate and unit rotational speed of each hydroelectric power plant unit are determined. A device for determining the daily power generation plan of hydroelectric power plants in a discharge mode, characterized in that it is configured to determine the overall operating efficiency of each hydroelectric power plant unit through a characteristic curve which is an overall characteristic curve or an operating characteristic curve corrected based on the accumulated operating data of each hydroelectric power plant unit, based on the unit flow rate and unit rotational speed.

7. Electronic device comprising a memory and a processor, wherein the memory and the processor are connected to each other in communication, a computer program is stored in the memory, and the processor executes the computer program to perform the method for determining the daily power generation plan of a hydroelectric power plant unit in the outflow mode described in any one of claims 1 to 4.

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